SiTime’s ‘Smallest and Lowest-Power’ 32 kHz MEMS TCXO: What the SiT1552 Actually Is

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On June 4, 2014, SiTime introduced the SiT1552, a 32.768 kHz silicon-MEMS temperature-compensated oscillator (TCXO) for wearables, IoT devices and other battery-powered products. SiTime described it as the smallest and lowest-power device of its type at the time. It is an active oscillator with a MEMS resonator—not a conventional quartz crystal—and current SiTime documentation still lists it as a production part.

What SiTime introduced in 2014

The SiT1552 announcement targeted wearables, smart meters, health monitors, asset trackers and connected sensors. Its 32.768 kHz output can serve as an RTC reference, sleep clock, Bluetooth/Bluetooth Low Energy or Wi-Fi connectivity reference, battery-supervisor heartbeat, or pulse-per-second timebase. The original announcement is documented by SiTime at its June 4, 2014 release.

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SiTime’s launch comparison claimed 20% of the size, 50% lower power, 45% less thickness, 10-times-faster startup and 30-times-higher shock resistance than comparable quartz devices, plus a 500-million-hour MTBF projection. Those are manufacturer comparisons against SiTime’s stated baseline, not universal measurements for every quartz component.

Why 32.768 kHz is used for low-power timekeeping

Thirty-two thousand seven hundred sixty-eight hertz is 2¹⁵. Fifteen binary divide-by-two stages produce 1 Hz, making the frequency convenient for RTCs, calendar circuits, sleep timers and periodic wake-ups. A low-frequency reference can remain active while a processor and radio spend most of their time powered down.

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It is a MEMS TCXO, not a traditional crystal

The SiT1552 is an oscillator IC containing a silicon MEMS resonator, temperature-compensation circuitry and a clock-output driver. A quartz resonator, by contrast, is a passive component that needs an oscillator circuit—often inside an MCU or RTC—and suitable load-capacitor design. SiTime positions the SiT1552 as an alternative to quartz oscillators and resonators; see the current product page and datasheet.

Current SiT1552 specifications

Not every SiT1552 ordering code has the same stability grade, temperature range, output interface or current. Select the exact code from the datasheet rather than treating the family headline as a single specification.

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How temperature compensation and NanoDrive affect a design

Frequency stability

Factory calibration over temperature is available in ±5, ±10 and ±20 ppm grades. As a simple conversion, 5 ppm is about 0.43 seconds of possible drift per day and 20 ppm about 1.73 seconds per day. These figures are arithmetic translations of the ppm rating, not guarantees covering every voltage, temperature, aging and assembly condition.

Better stability can reduce network time corrections. SiTime’s launch material estimated two- to three-times longer battery life than a 180 ppm quartz resonator in relevant connected applications, but that result depends on radio energy, firmware synchronization policy and duty cycle.

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Programmable output swing

NanoDrive lets SiTime program the output swing for the receiving circuit. Lower swing can reduce dynamic output power, but driver current still depends on supply voltage, programmed mode, load capacitance and switching activity. Use the electrical tables for the selected part.

Board-space and integration benefits

• The 1.5 × 0.8 mm CSP can save substantial area in a wearable or sensor.
• The part provides a clock output, so the designer normally does not create a crystal oscillator loop or choose external crystal-load capacitors.
• SiTime states that internal supply filtering can remove the external VDD bypass capacitor in the intended implementation; verify the final circuit against the current datasheet.
• Surface-mount, Pb-free, RoHS- and REACH-compliant options are documented, with a PFAS-free option available under the appropriate ordering code.

Manufacturing and electrical cautions

Assembly restrictions

• Do not use ultrasonic cleaning; the datasheet warns that it can damage the MEMS structure or create reliability problems.
• Do not apply underfill. SiTime warns that underfill can prevent the device from meeting its frequency-stability specification.
• Follow the recommended CSP land pattern, stencil guidance and JESD22-A113D reflow profile. The tiny package increases placement, inspection and rework demands.

Check the interface and startup behavior

NanoDrive and LVCMOS versions are not automatically interchangeable. Confirm logic level, swing, supply and input-waveform requirements for the MCU, PMIC, RTC or radio. Also determine whether the downstream system can tolerate roughly 180–300 ms after complete power removal; startup after sleep or regulator sequencing may differ.

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SiT1552 versus common alternatives

Conventional 32.768 kHz quartz products remain available; Epson’s timing catalog lists crystal and oscillator categories. No catalog part should be treated as a drop-in replacement without checking footprint, pinout, drive level, stability, startup and supply requirements.

When the SiT1552 is a good choice

• PCB area is severely constrained.
• Temperature-stable timekeeping matters more than the lowest unit price.
• The design needs a clock output without a separate crystal oscillator circuit.
• The supply is within 1.5–3.63 V and the chosen variant meets the required output interface.
• The assembly flow can avoid underfill and ultrasonic cleaning.

When quartz is likely better

• Unit cost dominates and the MCU already includes a suitable low-power 32 kHz oscillator.
• There is room for a resonator and load capacitors.
• ±20 ppm or looser performance is acceptable.
• The manufacturing process requires underfill or ultrasonic cleaning.
• The project needs a familiar package, broader supplier ecosystem or immediate clock startup.

Availability and buying considerations in 2026

SiTime currently lists the SiT1552 as a production device and provides configured part numbers through its site. On August 16, 2026, the direct-sales page for SiT1552A-J1-0001 displayed $5.774 for 1–99 units and $1.229 for 5,000–9,999 units. A separate ±5 ppm, 0–70°C LVCMOS listing at SiT1552AC-JE-DCC-32768-0 displayed $6.654 for 1–99 units. These prices and stock levels are volatile and apply only to the named configurations.

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A DigiKey listing for one ±10 ppm variant, SIT1552AI-JF-DCC-32-768E, showed a displayed unit price of $1.740 and stock at the time checked. Confirm current inventory, reel quantity, lead time and suffix before designing around it. SiTime also links a SiT6098 1508 evaluation-board manual from the product page for early testing.

Verdict

The SiT1552 remains compelling when a design needs a very small, temperature-stable 32.768 kHz clock and can pay for an active MEMS oscillator. The “smallest” and “lowest-power” labels are SiTime’s 2014 and continuing category claims, not independent rankings. For cost-sensitive boards, existing MCU crystal oscillators, or assembly flows that require underfill or ultrasonic cleaning, a conventional quartz solution may be the safer choice.

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