The AD842 is a single-channel, high-speed Analog Devices operational amplifier. If you searched for AD842JN, note that this is the datasheet’s J-grade electrical-characteristics designation; Analog Devices currently lists the 14-lead PDIP orderable model as AD842JNZ. The device is stable at closed-loop gains of 2 or higher—not as a unity-gain follower—and Analog Devices marks the AD842 “Not Recommended for New Designs.”
Start with the Analog Devices AD842 product page for current product and lifecycle information, and consult the official Rev. F datasheet for electrical limits, package drawings, and circuits.
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What AD842JN identifies—and the complete part number
The AD842 is a wideband, high-output-current, fast-settling voltage-feedback op amp with one amplifier per package. In the datasheet, “AD842JN” appears as a J-grade specification grouping; the manufacturer’s current listing identifies AD842JNZ as the 14-lead PDIP orderable model. The “Z” suffix is part of that listed order code, so verify the complete manufacturer number, package, and grade rather than assuming a seller’s “AD842JN” label is sufficient.
The J-grade PDIP operating-temperature range is 0°C to 70°C. Other AD842 suffixes and packages have different specifications or thermal characteristics; do not transfer a temperature range or electrical limit from another grade to the J-grade part.
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AD842J-grade specifications
The following figures refer to the J-grade datasheet grouping unless a condition is specified. Typical values are not guaranteed limits. Consult the datasheet tables for the exact grade, temperature, load, and test setup relevant to a design.
| Parameter | Value | Qualification |
|---|---|---|
| Amplifiers per package | 1 | Single op amp |
| Gain-bandwidth product | 80 MHz typical | At closed-loop gain 2; not a promise of flat bandwidth at every gain, load, or signal amplitude |
| Minimum stable closed-loop gain | 2 | Not unity-gain stable |
| Slew rate | 375 V/µs typical; 300 V/µs minimum | Under the datasheet’s specified closed-loop test condition |
| Settling time | 80 ns to 0.1%; 100 ns to 0.01% | Specified for a 10 V step; actual circuit settling depends on conditions and design |
| Full-power bandwidth | 6 MHz typical | For 20 V p-p into a load of at least 499 Ω |
| Input voltage noise | 9 nV/√Hz typical | At 1 kHz |
| Input offset voltage | 1.5 mV maximum | J-grade grouping; see the datasheet for table conditions |
| Input offset drift | 14 µV/°C | Datasheet value |
| Input bias current | 4.2 µA typical | Maximum varies with the applicable temperature conditions |
| Open-loop gain | 90 V/mV typical | Into a 499 Ω load |
| Output current | 100 mA minimum | Under specified output-voltage and load conditions; not an unconditional load rating |
| Quiescent current | Approximately 13–14 mA | Typical or maximum depends on grade and temperature condition |
| Operating supply range | ±5 V to ±18 V | Rated performance is specified at ±15 V |
| Common-mode input range | Approximately ±10 V | Under the stated ±15 V test condition |
| Package for AD842JNZ | 14-lead PDIP | Through-hole package |
| J-grade PDIP operating temperature | 0°C to 70°C | Do not assume another grade’s temperature range applies |
How to interpret the speed figures
These specifications describe different limits; none alone tells you whether the amplifier will meet a system’s bandwidth, amplitude, or settling requirement.
- Gain-bandwidth product: The 80 MHz typical figure is specified at closed-loop gain 2. It does not mean a 20 V peak-to-peak signal can be reproduced at 80 MHz.
- Slew rate: This describes the maximum large-signal rate of voltage change under a specified test. A sine wave’s required slew rate rises with both frequency and peak amplitude. A useful estimate is
f ≈ slew rate / (2π × Vpeak). - Full-power bandwidth: The datasheet’s approximately 6 MHz typical result is for a 20 V p-p signal into at least 499 Ω. It is a large-signal, load-dependent figure.
- Settling time: The 100 ns to 0.01% specification applies to a stated 10 V step. It does not guarantee that every circuit settles to a particular ADC’s accuracy within 100 ns.
At high speed, feedback gain, output swing, load resistance, capacitance, layout, and supply bypassing all affect performance. Use the exact datasheet test conditions as a comparison baseline, then verify the assembled circuit against its actual signal and load.
Supply and absolute-maximum limits
The specified operating supply range is ±5 V to ±18 V, with rated performance at ±15 V. The datasheet also lists ±18 V as the absolute maximum supply voltage. Because the operating upper bound meets the absolute maximum, a design intended to run near ±18 V has no margin for supply tolerance or transients; select rails and protection with those conditions in mind.
Other relevant absolute maximum ratings include a ±6 V differential input voltage and input-voltage limits relative to the supply rails. The datasheet also specifies maximum internal power dissipation and thermal constraints. Absolute maximum ratings are stress limits, not recommended operating targets: exceeding them may permanently damage the device, and operation at those limits is not implied. Check the datasheet’s full ratings and package thermal information for the intended board and ambient conditions.
Package and pinout
The AD842JNZ is a through-hole 14-lead PDIP. The AD842 family also includes 14-lead CERDIP and 16-lead wide SOIC variants; package choice can change thermal behavior and applicable grade specifications.
Use the AD842’s own package drawing in the official datasheet to identify pin numbers and orientation. Its functional pins include positive and negative supplies, noninverting and inverting inputs, output, and balance pins. Do not substitute a generic op-amp pinout: the balance pins and 14-lead arrangement mean it is not a simple 8-pin 741-style replacement.
Stability and practical circuit design
The AD842 is specified as stable at closed-loop gains of 2 or greater. A voltage follower or other gain-of-1 configuration is not an approved default use: it can oscillate or exhibit excessive ringing. Check the circuit’s noise gain as well as its signal gain, particularly in inverting configurations.
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- Keep feedback connections short and compact; stray capacitance and inductance can undermine stability at high speed.
- Place local supply bypass capacitors close to the supply pins, following the datasheet’s layout guidance.
- Evaluate the real load, including cable capacitance and ADC input networks. A capacitive load can reduce phase margin and cause overshoot; do not assume an arbitrary cable or capacitor can be driven directly.
- Check output swing, load current, and power dissipation together. The 100 mA minimum output-current specification applies under particular conditions; it does not mean the part can continuously drive any load at any output voltage.
- Verify transient response and settling to the required accuracy on the intended board. Slew rate or bandwidth alone does not establish settling performance.
Where the AD842 fits
Analog Devices lists uses including high-frequency signal conditioning, wideband active filters, video and pulse amplification, line driving, and high-speed ADC or DAC buffering. These are application categories, not guarantees for a particular circuit. Confirm the required gain, signal amplitude, load, temperature, and settling behavior against the datasheet and test the actual implementation.
The part can be useful in an existing design that needs fast settling and substantial output drive, has dual supplies, operates within the J-grade temperature range, and uses a closed-loop gain of at least 2. Its comparatively high quiescent current, non-rail-to-rail behavior, temperature range, and lifecycle status can make it a poor fit for low-power, low-voltage, or long-life new designs.
Is the AD842 still a good choice?
Analog Devices currently labels the AD842 “Not Recommended for New Designs.” That is a lifecycle warning, not proof that every package is unavailable. Check the manufacturer product page for current status and sourcing before committing to a design. For legacy repair or a qualified design, preserving the established footprint and circuit may be more important than choosing a newer part; for new production, assess lifecycle, supply continuity, and alternatives before approval.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choosing and qualifying a replacement
There is no universal drop-in replacement. Match the circuit’s minimum noise gain, supply rails, input common-mode range, output swing and current, load capacitance, bandwidth, settling accuracy, package, and temperature requirements. Similar-looking part numbers do not establish electrical or pin compatibility.
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The AD841 is a related wideband op amp that is unity-gain stable. Its published characteristics differ: approximately 40 MHz unity-gain bandwidth, 300 V/µs slew rate, 110 ns settling to 0.01%, and a 50 mA minimum output-current specification. It may be worth evaluating when gain-of-1 stability is needed, but it is not automatically a drop-in equivalent. See the Analog Devices AD841 page and check its datasheet against the full circuit.
Do not confuse similarly numbered instrumentation amplifiers
The AD8420, AD8421, and AD8428 are instrumentation amplifiers, not direct substitutes for the AD842 voltage-feedback op amp. Their architectures, pinouts, gain behavior, supply requirements, and intended applications differ. The AD8420 product page is one example of the distinct product family.
Replacement qualification steps
- Identify the original closed-loop gain and noise gain, including any compensation components.
- Record supply rails, input common-mode range, output range, and load current.
- Estimate load capacitance, including cables, PCB parasitics, and the receiving ADC or DAC network.
- Compare noise, offset, bias current, slew rate, bandwidth, settling, and output drive using conditions relevant to the application.
- Confirm package, pin-by-pin compatibility, and temperature grade; do not infer compatibility from similar names.
- Review lifecycle and sourcing using Analog Devices’ product lifecycle information and obsolete-product cross-reference search.
- Re-run stability and transient analysis, then build and test the proposed replacement in hardware.
Buying and verifying legacy parts
For a critical design, prefer traceable supply from an authorized source. Analog Devices provides an authorized distributor directory and purchasing information. Distributor stock, lead times, and prices vary by region, date, and quantity; confirm the exact AD842JNZ code and package at the time of purchase.
AD842 family listings at Mouser, DigiKey, and Newark are useful sourcing checks, but their listings do not establish current availability or guarantee suitability. The DigiKey family page may show other package variants; a different package is not automatically interchangeable. For surplus or legacy stock, account for traceability, storage, date-code, screening, and authenticity risks; consider incoming inspection and testing for critical use.
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AD842JNZ selection checklist
- Is the complete manufacturer order code AD842JNZ, and does the package match the board?
- Is the J-grade 0°C to 70°C range sufficient?
- Can the circuit maintain closed-loop gain of at least 2?
- Are the supply rails, input range, output swing, and load within datasheet limits with margin?
- Have feedback stability, capacitive loading, bypassing, thermal dissipation, and required settling accuracy been checked?
- Is lifecycle status and traceable availability acceptable for the repair or production plan?
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.
