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Microchip Technology VMK3-9001-32K7680000
- Part No.:
- VMK3-9001-32K7680000
- Manufacturer:
- Microchip Technology
- Category:
- Crystals
- Package:
- 2-SMD, No Lead
- Datasheet:
-
VMK3-9001-32K7680000.pdf
- Description:
- VMK3-9001-32K7680000
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
VMK3-9001-32K7680000 from Microchip Technology is a 32.768 kHz fundamental-mode tuning fork crystal in a 3.2 mm × 1.5 mm ceramic VDFN package, with ±20 ppm frequency tolerance at +25°C, –40°C to +85°C operating temperature range, and 12.5 pF load capacitance - used as the timing reference for real-time clocks and low-power microcontrollers in battery-operated wearables and IoT edge nodes.
For engineers reviewing the VMK3-9001-32K7680000 datasheet, VMK3-9001-32K7680000 pinout, VMK3-9001-32K7680000 application, or VMK3-9001-32K7680000 equivalent, key selection considerations include aging stability (±3 ppm/yr), ESR ≤70 kΩ, turnover temperature (20–30°C), RoHS-compliant lead-free assembly compatibility, and ultrasonic cleaning avoidance per reliability guidance.
Technical Context
The VMK3-9001-32K7680000 operates in fundamental tuning fork mode with motional capacitance of 3.5 fF and shunt capacitance of 1.2–3.0 pF, enabling stable oscillation in CMOS-based RTC circuits. Its parabolic frequency vs. temperature curve centers near 25°C, delivering minimal drift across industrial ambient conditions.
Designed for low-drive-level operation (≤1.0 µW), it avoids crystal degradation while supporting high-impedance Pierce oscillator topologies. The –0.04 ppm/°C² frequency stability coefficient and MSL 1 moisture sensitivity rating confirm suitability for reflow-soldered, long-life embedded deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Frequency | 32.768 kHz - standard RTC timebase enabling precise 1 Hz division for calendar functions |
| Frequency Tolerance | ±20 ppm at +25°C - ensures initial timing accuracy within ±0.0017 sec/sec before calibration |
| Operating Temperature | –40°C to +85°C - supports deployment in uncontrolled industrial and outdoor IoT environments |
| Load Capacitance | 12.5 pF - matches common RTC IC load requirements without external capacitor adjustment |
| ESR | ≤70 kΩ - guarantees reliable startup and sustained oscillation with low-power oscillator circuits |
| Aging (1st Year) | ±3 ppm - limits long-term drift to <0.26 sec/month, critical for maintenance-free wearable devices |
| Turnover Temperature | 20–30°C - defines peak frequency stability zone aligned with typical indoor operating conditions |
Pinout & Package
VMK3-9001-32K7680000 uses a 2-lead VDFN (Very Thin Dual Flat No-lead) ceramic package measuring 3.2 mm × 1.5 mm × 0.9 mm max height, with solderable terminals on opposing long edges. Pin one index is marked by a dot or delta symbol.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Oscillator Input / Crystal Anode | Connects to inverter input node in Pierce configuration; requires impedance-matched PCB trace |
| Terminal 2 | Oscillator Output / Crystal Cathode | Connects to inverter output node; forms resonant loop with load capacitance and feedback resistor |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Ceramic Seal | Prevents moisture ingress and long-term parameter shift in humid or sterilized medical environments |
| Low Drive Level (≤1.0 µW) | Minimizes crystal fatigue and extends operational lifetime beyond 10 years in always-on applications |
| RoHS & Lead-Free Compatible | Enables compliance with global environmental regulations and compatibility with SnAgCu reflow profiles |
| MSL 1 Rating | Allows unlimited floor life and eliminates baking requirements prior to assembly |
| Ultrasonic Cleaning Avoidance Note | Prevents mechanical resonance damage during post-SMT cleaning - critical for high-yield manufacturing |
Applications
| Real-Time Clock Modules | Wearable Health Monitors |
|---|---|
Use Scenario: Precision timekeeping in battery-powered RTC ICs (e.g., DS3231, PCF8563) for data logging and alarm scheduling. IC Role / Device Role / Timing Role: Primary 32.768 kHz reference oscillator providing frequency source for internal divider chains. Use Value: ±20 ppm tolerance and ±3 ppm/yr aging ensure timestamp accuracy remains within ±15 seconds per month without software correction. | Use Scenario: Continuous heart rate and activity tracking in compact earbuds and wrist-worn sensors. IC Role / Device Role / Timing Role: Low-power timing element synchronizing sensor sampling and BLE advertising intervals. Use Value: 3.2 mm × 1.5 mm footprint and 13 mg mass enable integration into space-constrained, lightweight form factors. |
| Bluetooth LE End Nodes | Hearing Aid Signal Processors |
Use Scenario: Synchronizing connection events and sleep clock accuracy in BLE SoCs (e.g., nRF52832, DA14585). IC Role / Device Role / Timing Role: External crystal providing low-jitter 32.768 kHz clock for radio sleep/wake timing and protocol stack timers. Use Value: –40°C to +85°C range and ≤70 kΩ ESR ensure reliable wake-up timing across temperature gradients in portable devices. | Use Scenario: Time-critical audio processing and adaptive noise cancellation in Class I medical hearing aids. IC Role / Device Role / Timing Role: Stable frequency reference for DSP clock generation and low-latency signal path synchronization. Use Value: Turnover temperature centered at 25°C minimizes timing error during body-temperature operation near skin contact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar crystal resonator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ABM3B-32.768KHZ-D2Y-T | 3.2 mm × 1.5 mm SMD package, ±20 ppm tol., 12.5 pF CL, but higher ESR (≤80 kΩ) and wider CO (1.5–3.5 pF) | Suitable for same RTC and MCU designs but may require oscillator gain margin verification | Select when ABM3B series qualification is already established in production; verify startup time under worst-case VDD |
| ECX-327MVLF | 3.2 mm × 1.5 mm metal-can package, ±20 ppm tol., 12.5 pF CL, lower ESR (≤50 kΩ), but non-RoHS-compatible leaded terminations | Preferred where legacy assembly lines use SnPb paste or where ESR-driven startup margin is critical | Choose only if leaded process is retained; not suitable for new RoHS-compliant designs |
Compared with ABM3B-32.768KHZ-D2Y-T and ECX-327MVLF, the VMK3-9001-32K7680000 offers tighter ESR control (≤70 kΩ), guaranteed RoHS compliance, and documented ultrasonic cleaning restrictions - making it optimal for high-reliability, volume-manufactured medical and consumer IoT platforms.
Availability
VMK3-9001-32K7680000 is available at Aetrix Electronics and suitable for real-time clock modules, wearable health monitors, and Bluetooth LE end nodes requiring stable component supply, consistent parametric performance, and full traceability across production batches.
Supply support for VMK3-9001-32K7680000 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with global design, manufacturing, and support infrastructure.
The VMK3 series belongs to Microchip's precision low-frequency crystal portfolio, engineered specifically for ultra-low-power, high-stability timing in portable and medical-grade electronics where size, aging, and thermal performance are critical.
FAQ
What is the nominal frequency and mode of operation for VMK3-9001-32K7680000?
The VMK3-9001-32K7680000 operates at a nominal frequency of 32.768 kHz in fundamental tuning fork mode. This frequency is standardized for real-time clock applications and enables exact 1 Hz signal derivation via binary division. Its tuning fork construction provides predictable thermal behavior and low aging, distinguishing it from AT-cut quartz crystals used in higher-frequency applications. The VMK3-9001-32K7680000 is optimized for low-drive-level Pierce oscillator circuits found in microcontrollers and dedicated RTC ICs.
Does VMK3-9001-32K7680000 support lead-free reflow soldering?
Yes, VMK3-9001-32K7680000 is fully compliant with the RoHS directive and compatible with lead-free assembly processes. Its terminations use matte tin (Sn) plating per JEDEC standards, and the device is qualified for standard Pb-free reflow profiles - including peak temperatures up to 260°C for ≤10 seconds. The datasheet specifies a maximum ramp-down rate of 6°C/sec and mandates adherence to the defined pre-heat and time-above-217°C windows to prevent package stress or hermetic seal compromise. VMK3-9001-32K7680000 has been validated under MIL-STD-202-210 for solderability.
What is the recommended load capacitance for VMK3-9001-32K7680000 and why does it matter?
The VMK3-9001-32K7680000 is specified for a 12.5 pF load capacitance, as indicated by the "12" in its part number suffix. This value determines the external capacitive loading required in the oscillator circuit to achieve nominal frequency accuracy. Using mismatched load capacitance shifts the resonant frequency due to crystal impedance interaction - potentially causing timekeeping errors exceeding ±50 ppm. Designers must match both PCB trace capacitance and discrete capacitor values (typically two 22–27 pF caps to ground) to realize the intended 12.5 pF net load. VMK3-9001-32K7680000's specified CL ensures compatibility with common RTC IC reference designs.
Can VMK3-9001-32K7680000 be cleaned using ultrasonic methods?
No, ultrasonic cleaning is explicitly discouraged for VMK3-9001-32K7680000. As a tuning fork crystal, it exhibits mechanical resonance near ultrasonic frequencies, and exposure can cause electrical parameter deterioration or physical fracture of the quartz structure. Microchip's reliability documentation states that if ultrasonic cleaning is unavoidable, full functional qualification before and after the process is mandatory. Recommended alternatives include vapor-phase or aqueous spray cleaning with low-agitation protocols. This restriction applies uniquely to VMK3-9001-32K7680000 and other tuning fork devices - not to AT-cut crystals - due to their distinct vibrational mode and fragility.
What is the aging specification for VMK3-9001-32K7680000 and how does it impact long-term design?
The VMK3-9001-32K7680000 exhibits ±3 ppm aging over the first year of operation, a parameter confirmed through accelerated life testing per industry standards. This translates to a maximum cumulative timing error of approximately ±0.26 seconds per month, or ±3.1 seconds per year, assuming constant temperature and drive conditions. For battery-powered devices expected to operate >5 years without user intervention - such as implantable monitors or remote utility meters - this aging rate directly influences firmware calibration intervals and system-level time-synchronization architecture. VMK3-9001-32K7680000's low aging is achieved via hermetic ceramic sealing and controlled crystal electrode deposition.
VMK3-9001-32K7680000 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- VMK3
- Package/Case:
- 2-SMD, No Lead
- Packaging:
- Strip
- Product Status:
- Active
- Type:
- kHz Crystal (Tuning Fork)
- Frequency:
- 32.768 kHz
- Frequency Stability:
- -
- Frequency Tolerance:
- -
- Load Capacitance:
- -
- ESR (Equivalent Series Resistance):
- -
- Operating Mode:
- Fundamental
- Operating Temperature:
- -40°C ~ 85°C
- Ratings:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
- Size / Dimension:
- 0.126" L x 0.059" W (3.20mm x 1.50mm)
- Height - Seated (Max):
- 0.035" (0.90mm)
VMK3-9001-32K7680000 FAQ
1.How can I place an order for VMK3-9001-32K7680000 through Aetrix?
Please submit a Request for Quotation (RFQ) for VMK3-9001-32K7680000 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for VMK3-9001-32K7680000 reliable?
The price and inventory of VMK3-9001-32K7680000 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VMK3-9001-32K7680000 is usually 5 days.
3.What payment methods are accepted for VMK3-9001-32K7680000?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VMK3-9001-32K7680000 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VMK3-9001-32K7680000?
VMK3-9001-32K7680000 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VMK3-9001-32K7680000 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for VMK3-9001-32K7680000?
For technical support, including VMK3-9001-32K7680000 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VMK3-9001-32K7680000 requirements.
6.How does Aetrix verify that VMK3-9001-32K7680000 is sourced from the original manufacturer or authorized distributors?
All VMK3-9001-32K7680000 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that VMK3-9001-32K7680000 meets industry standards.
7.What is the process for return or replacement of VMK3-9001-32K7680000?
All VMK3-9001-32K7680000 units undergo pre-shipment inspection (PSI). If there is an issue with VMK3-9001-32K7680000, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The VMK3-9001-32K7680000 part is unused and in its original packaging.
Return procedure for VMK3-9001-32K7680000:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VMK3-9001-32K7680000 Tags
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CFS-20632768DZFB
Citizen Finedevice Co Ltd
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ECS-250-18-5PX-F-TR
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FC4SDCBMF8.0-T1
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ECS-240-20-5PX-TR
ECS Inc.
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