iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Read a ceramic capacitor’s temperature code as a statement about capacitance change over a specified temperature range—not as its complete specification. For a Class II code such as X7R, the first character identifies the lower temperature category, the number identifies the upper category, and the final character gives the permitted capacitance change. Class I parts such as C0G use a temperature coefficient expressed in ppm/°C. In both cases, the exact part number and datasheet are still required to determine initial tolerance, DC-bias behavior, voltage rating, aging and package limits.
The distinctions below let you decode the marking, compare dielectric classes and avoid treating a temperature classification as a guarantee of in-circuit capacitance.
What the temperature code actually tells you
Multilayer ceramic capacitors (MLCCs) are classified by how their capacitance changes with temperature. The code is a compact classification, not a complete electrical specification. It normally tells you the allowed temperature span and the maximum change from a reference capacitance within that span. It does not, by itself, tell you the nominal capacitance, room-temperature tolerance, rated voltage, effective capacitance under DC bias, aging rate or suitability as a replacement.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →TDK describes the Class II convention this way: the first letter determines the lowest operating temperature, the number determines the upper operating temperature, and the final letter determines the maximum capacitance change at any temperature in that range. See the TDK Product Center temperature-characteristic explanation for its current code tables (page inspected October 13, 2026).
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Decoding common Class II EIA codes
Class II dielectrics provide relatively high capacitance in small packages, but their capacitance is more sensitive to temperature, applied voltage and time than Class I dielectrics. In the common three-character EIA notation:
- The first character is the lower-temperature category.
- The second character is the upper-temperature category.
- The third character is the maximum permitted capacitance change across that temperature range.
| Code | Lower limit | Upper limit | Permitted temperature-related change | Interpretation |
|---|---|---|---|---|
| X7R | −55°C | +125°C | ±15% | Capacitance may move either direction by up to 15% over the classified range. |
| X5R | −55°C | +85°C | ±15% | The same percentage limit as X7R, but with a lower upper-temperature limit. |
| Y5V | −30°C | +85°C | +22%/−82% | The permitted change is strongly asymmetric; a large decrease is allowed. |
These are classification limits relative to a reference capacitance. They are not a promise that a 10 µF component will measure 10 µF in your circuit, nor do they describe voltage coefficient. TDK lists additional combinations, including X8R and Z5U; verify any less-familiar code against the applicable standard and the manufacturer’s datasheet rather than extrapolating from X7R or X5R.
Reading X7R character by character
For X7R, X identifies the −55°C lower category, 7 identifies the +125°C upper category, and R identifies the ±15% maximum change category. If the capacitor is operated outside −55°C to +125°C, the X7R classification no longer describes its behavior. The code also says nothing about whether the part is 0402, 0805 or another package, or whether it is rated for the voltage in your design.
Reading X5R and Y5V
X5R has the same −55°C lower limit and ±15% temperature-change category as X7R, but its upper limit is +85°C. Y5V spans −30°C to +85°C and permits +22%/−82%; the negative limit means capacitance can fall substantially as temperature changes. Those figures come from manufacturer technical explanations by TDK and KYOCERA AVX, including the KYOCERA AVX ceramic-capacitor variability and tolerance note.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
How Class I notation differs
Class I ceramics are intended for applications where capacitance stability matters more than maximum capacitance per volume. Their temperature behavior is expressed as a coefficient in parts per million per degree Celsius (ppm/°C), rather than the broad percentage categories used for Class II.
KYOCERA AVX explains that the three-character Class I EIA notation encodes the coefficient’s significant figure, multiplier and tolerance. The exact coefficient must be read using the manufacturer’s code table; do not treat a Class I code as though it used the X7R three-position temperature-range scheme.
C0G and NP0
C0G is a common Class I designation and is associated with NP0 terminology. TDK’s general explanation states ±30 ppm/°C over −55°C to +125°C for C0G/NP0 in that context. TDK also describes an NP0 range extending to +150°C. The +150°C detail is TDK-specific, not a universal promise for every part sold as C0G or NP0; confirm the rated range on the exact datasheet.
Free tools Windows power users keep installed
One-click scans. No signup required.
The designation identifies a dielectric behavior, not every construction detail. Rated voltage, package size, capacitance value, tolerance and test conditions can differ between manufacturers and series. The TDK Class I versus Class II FAQ provides the manufacturer’s comparison of the two classes.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Temperature characteristic, initial tolerance and DC bias are different specifications
Three separate questions are often confused:
| Specification | Question it answers | Where to find it |
|---|---|---|
| Temperature characteristic | How far may capacitance change as temperature moves through the classified range? | Dielectric code such as X7R, X5R, Y5V or a Class I coefficient. |
| Initial capacitance tolerance | How close is the part to its nominal value under the stated reference test conditions? | The ordering code and electrical-characteristics table. |
| Voltage coefficient | How does capacitance change when a DC or AC voltage is applied? | Capacitance-versus-voltage curves or data for the exact part. |
| Aging | How does capacitance drift with elapsed time after manufacture or a reset event? | The datasheet’s aging specification and test method. |
A temperature code is therefore not the capacitor’s room-temperature tolerance. A part marked with a Class II dielectric still needs a separate tolerance selection in its full ordering code. Likewise, X7R and Y5V do not encode voltage-bias performance.
Why the same X7R value can behave differently in a circuit
Class II capacitance can decrease substantially under DC bias. Analog Devices illustrates this with a nominal 4.7 µF X7R component whose effective capacitance becomes much lower under the cited bias conditions. The values shown there describe one component and circuit context, not a general statistic or guarantee. Its article, Temperature and Voltage Variation of Ceramic Capacitors (published December 4, 2012), emphasizes that engineers must check the data to know how a specific capacitor performs under voltage.
For a design that needs a minimum capacitance, read the manufacturer’s capacitance-versus-DC-voltage curve at the actual bias, temperature and frequency. A nominal value selected from the first line of a distributor listing may not be the value available to the circuit. Package dimensions, dielectric formulation, rated voltage and electrode construction all influence the curve.
A reliable procedure for reading an unknown capacitor
- Identify the dielectric notation. Decide whether the marking is a Class II temperature code such as X7R or Y5V, a Class I designation such as C0G, or a manufacturer-specific marking. Do not apply the Class II letter-number-letter interpretation to an unfamiliar Class I code.
- Separate the code from the nominal value. A marking may contain capacitance, voltage, tolerance, package and dielectric information in one ordering string. Locate the manufacturer’s part-number legend before interpreting individual characters.
- Decode the Class II range, if applicable. Record the lower temperature, upper temperature and permitted change. For example, X5R means −55°C to +85°C and ±15%.
- Convert a Class I marking with the correct table. Read the coefficient’s significant figure, multiplier and tolerance from the manufacturer’s EIA notation table. If the marking is C0G or NP0, use the exact series datasheet for its ppm/°C and rated range.
- Find the initial tolerance. Treat the tolerance character in the complete ordering code as a separate requirement from the temperature characteristic. If the code is incomplete, the tolerance is not established.
- Check operating limits. Compare the circuit’s minimum and maximum temperatures with the classified range, then check rated voltage, frequency, ripple or AC voltage as applicable.
- Check DC-bias data for Class II. Use the exact capacitance-versus-voltage curve or table. If no curve is published, contact the manufacturer rather than assuming a typical retention percentage.
- Account for package and construction. Confirm case size, termination, mounting stress guidance and the specific part series. Two parts with the same dielectric code and nominal capacitance are not automatically interchangeable.
Choosing Class I or Class II
| Priority | Usually favors | Reasoning | Checks still required |
|---|---|---|---|
| Very stable capacitance over temperature | Class I, often C0G/NP0 | Behavior is specified in ppm/°C and is generally much smaller than Class II percentage limits. | Exact coefficient, temperature range, tolerance, voltage and capacitance availability. |
| High capacitance in a compact package | Class II, such as X7R or X5R | Class II dielectrics provide higher values per volume. | Temperature limits, DC-bias curve, aging, rated voltage and effective capacitance. |
| Operation to +125°C | X7R or a part whose datasheet covers the temperature | X7R’s classification reaches +125°C; X5R and Y5V classifications reach +85°C. | Verify the exact manufacturer rating and all other deratings. |
| Known minimum capacitance under bias | Whichever dielectric and package meet the curve | The code alone cannot establish in-circuit capacitance. | Use measured or published bias data at the design condition. |
Class I may be unsuitable when the required capacitance is too large for the available package or cost, while Class II may be unsuitable when a filter, timing network or resonant circuit cannot tolerate its temperature, bias or aging drift. The correct choice is the part that meets the circuit’s worst-case electrical limits, not the code that looks most familiar.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
How to interpret tolerance in a full part number
Manufacturers commonly place capacitance tolerance in a separate position from the dielectric or temperature characteristic. The tolerance symbol and its position are manufacturer- and series-dependent, so decode them with the ordering-code table rather than a generic chart. Read the nominal capacitance, tolerance and test conditions together: a stated tolerance is meaningful only at the specified measurement frequency, voltage, temperature and bias.
If a bill of materials says only “10 µF X7R,” it is incomplete for a controlled design. It does not identify the allowed initial error, rated voltage, package, termination, operating-temperature rating or minimum effective capacitance under bias. Add those requirements or specify a complete manufacturer part number.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What an LCR meter can and cannot tell you
An LCR or capacitance meter measures electrical properties under its own test conditions. It can help verify an assembled value or compare a suspect part, but it does not independently identify the capacitor’s temperature classification, voltage rating or aging history. A reading that differs from the nominal value may reflect the meter’s test frequency and level, DC bias, fixture parasitics, temperature, mechanical damage or the capacitor’s normal tolerance.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
To identify an unmarked surface-mount part, use the board’s bill of materials, assembly records or the manufacturer’s full part number. Tiny MLCCs often have no readable marking. Measuring one out of circuit is not a substitute for finding its datasheet.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Common mistakes and how to correct them
- “X7R means the capacitor is always within ±15%.” Correction: ±15% is the temperature-related classification over −55°C to +125°C. DC bias, initial tolerance and aging are separate effects.
- “X5R and X7R are interchangeable.” Correction: X5R’s classified upper limit is +85°C; X7R’s is +125°C. Compare the actual operating profile and datasheet.
- “Y5V is just a looser X5R.” Correction: Y5V has a different range (−30°C to +85°C) and an asymmetric +22%/−82% temperature-change limit.
- “C0G can be decoded with the X7R positions.” Correction: Class I notation uses ppm/°C coefficient information; use the applicable Class I table and datasheet.
- “A capacitance meter identifies a replacement.” Correction: The meter reports behavior under its test conditions; it does not prove dielectric class, voltage rating or bias performance.
- “Any part with the same code is a safe substitute.” Correction: Check capacitance, tolerance, package, rated voltage, temperature range, bias curve, aging and construction for the exact series.
- “A distributor description is the complete specification.” Correction: Product availability and ratings change. Confirm current values in the manufacturer’s datasheet and ordering code.
Worked reading examples
Example: an X7R decoupling capacitor
Suppose the dielectric portion of a part number is X7R. Record −55°C to +125°C and ±15% as its temperature classification. Then look elsewhere in the part number and datasheet for nominal capacitance, initial tolerance, rated voltage and case size. If the rail applies a substantial DC voltage, read the bias curve before deciding whether the nominal value provides enough effective capacitance.
Example: an X5R part in a warm enclosure
An X5R code establishes −55°C to +85°C and ±15% for temperature-related change. If the enclosure can exceed +85°C, X5R’s classification does not cover that condition; select a part with a datasheet rating that does, and verify voltage and bias behavior separately.
Example: a C0G timing capacitor
C0G indicates a Class I dielectric family. Find the exact series’ coefficient in ppm/°C, rated temperature range, nominal capacitance and initial tolerance. Do not assume that every C0G part has TDK’s stated range or that the NP0 term implies the +150°C extension described for a particular TDK product family.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallOutdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWhen the datasheet is missing information
Do not fill an unstated table cell with a typical value. If a comparison lacks a published initial tolerance, DC-bias curve or upper temperature rating for the exact part, record it as not stated and obtain the manufacturer’s documentation. Murata’s overview of ceramic-capacitor temperature characteristics is another useful manufacturer reference: What is the temperature characteristics of ceramic capacitors? (inspected October 13, 2026).
For safety- or reliability-critical designs, preserve the datasheet revision with the approved part number. Recheck availability and ratings when sourcing changes, because a similar-looking code from another series may use different test conditions or construction.
Quick Recap
A compact checklist before approving a part
- Have you identified whether the dielectric is Class I or Class II?
- For Class II, have you decoded all three temperature-code positions?
- For Class I, have you converted the coefficient using the correct manufacturer table?
- Is the initial capacitance tolerance explicitly specified?
- Does the classified temperature range cover the real minimum and maximum?
- Does the effective capacitance meet the circuit requirement at DC bias and operating frequency?
- Are rated voltage, package, termination, aging and mechanical constraints acceptable?
- Are all conclusions tied to the exact manufacturer part number and current datasheet?
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
