VXM7A-9001-24M0000000TR: Quick Specs & Test Data Summary
Key Takeaways
- Wide Temp Range: Reliable operation from -40°C to +125°C for automotive use.
- Optimized Load: 8pF capacitance ensures low-power MCU compatibility and fast startup.
- Compact 3225: Small 3.2x2.5mm footprint saves 30% PCB space vs 5032 packages.
- Precise Timing: 24MHz frequency ideal for high-speed UART and sensor synchronization.
Point: The VXM7A-9001-24M0000000TR is a 24 MHz SMD crystal specified for wide-temperature operation and timing-critical systems. Evidence: It is specified for −40°C to +125°C, nominal load capacitance of 8 pF, and a typical ESR near 100 Ω — numbers that drive oscillator startup and jitter performance. Explanation: These core metrics determine whether the device meets microcontroller clocking, automotive timing, or sensor-sampling requirements under real-world stress and margin assumptions.
Point: This report breaks down every key spec and provides practical test and integration guidance. Evidence: It covers decoding the part code, electrical behavior (tolerance, ageing, ESR, drive), mechanical footprint and soldering, measurement methods, and a PCB integration checklist. Explanation: System designers can use the supplied formulas, worked capacitor examples, and test-flow diagram to verify compatibility and qualify batches prior to production.
Competitive Differentiation
| Feature | VXM7A-9001-24M0000000TR | Standard Industrial Crystal | User Benefit |
|---|---|---|---|
| Operating Temp | -40°C to +125°C | -20°C to +70°C | Supports under-the-hood automotive apps. |
| Load Cap (CL) | 8 pF | 12 pF - 20 pF | Lower power consumption, faster oscillation. |
| Package Size | 3225 (3.2x2.5mm) | 5032 or larger | High-density PCB layouts possible. |
| Reliability | AEC-Q200 Grade Capable | Standard Consumer | Reduced field failure rates in harsh environments. |
Background & quick-specs overview
One-line spec summary
Point: A concise spec snapshot clarifies immediate suitability. Evidence: Nominal frequency: 24 MHz; Load capacitance: 8 pF; Typical ESR: 100 Ω; Operating mode: fundamental; Drive level: 10 µW typical; Package size: 3.2 × 2.5 mm (3225); Termination: SMD; Temp range: −40°C to +125°C. Explanation: Emphasizing ESR and load capacitance helps engineers predict oscillator loop gain and select matching external capacitors and oscillator ICs for robust startup and low jitter.
| Parameter | Value |
|---|---|
| Part | VXM7A-9001-24M0000000TR |
| Frequency | 24 MHz |
| Load Capacitance | 8 pF |
| ESR (typ) | 100 Ω |
| Package | 3225 (3.2 × 2.5 mm) |
| Temp Range | −40°C to +125°C |
Engineer's Insight: Advanced Implementation
By Julian Sterling, Senior Hardware Integration Specialist
"When integrating this 24MHz crystal, the most common pitfall is the Negative Resistance Ratio. Ensure your MCU's oscillator gain provides at least 5x the ESR (in this case, >500Ω) to guarantee reliable startup across the full -40°C to +125°C range. If you see intermittent boot-ups at cold temperatures, check your load capacitor matching first."
- PCB Tip: Place the crystal as close as possible to the MCU pins to minimize parasitic inductance, which can shift the 24MHz frequency.
- Troubleshooting: If frequency drifts, verify if the 8pF load includes the ~2pF trace capacitance.
What the part number indicates (decoding)
Point: The part code encodes frequency family, internal series and traceability suffixes. Evidence: The core numeric block denotes the 24 MHz frequency class, while suffixes often indicate packaging form, tape-and-reel options or internal lot codes. Explanation: Designers should confirm suffix meanings on the manufacturer datasheet and verify packaging/batch options during procurement to ensure traceability and matching of electrical lot characteristics.
Electrical characteristics — deep dive
Frequency stability, tolerance & ageing
Point: Frequency tolerance and stability define system timing error budgets. Evidence: Typical initial frequency tolerance at 25°C is specified as a few ppm (designers should assume ±20–50 ppm unless tighter grade is specified); stability over temperature can add tens to hundreds of ppm across −40°C to +125°C; typical ageing is ~1–5 ppm/year. Explanation: For a 24 MHz clock, 10 ppm equals 240 Hz offset; for UART timing, that converts to baud-rate error—so margining with PLLs or oversampling is necessary when tight accuracy is required.
ESR, drive level & equivalent circuit implications
Point: ESR controls oscillator loop gain, startup time, and amplitude. Evidence: A 100 Ω ESR interacting with typical inverter input capacitance and external load caps reduces available loop gain; drive level ~10 µW sets a maximum safe dissipation to avoid non-linear behavior. Explanation: When ESR is high, oscillator buffers must provide sufficient negative resistance; designers should check oscillator IC negative resistance specs and avoid excessive drive that can shift frequency or damage the crystal.
Mechanical & environmental specifications
Package, footprint & soldering profile
Point: Mechanical handling and reflow conditions affect assembly yield and long-term reliability. Evidence: Package nominal 3.20 mm × 2.50 mm; suggested pad clearance and stencil apertures reduce tombstoning and solder bridging. Explanation: Recommend solder paste stencil apertures ~60–70% of pad area, 0.2 mm solder mask clearance, and peak reflow temperatures consistent with common SMD processes.
| Dimension | Spec / Recommendation |
|---|---|
| Length | 3.20 mm ± typ |
| Width | 2.50 mm ± typ |
| Pad spacing | 0.9–1.1 mm pitch |
| Stencil | 60–70% aperture |
Typical Oscillator Layout Schematic
Typical Pierce Oscillator configuration with decoupling caps.
Operating temperature, shock & vibration
Point: The wide temp rating makes the device suitable for harsh environments but requires qualification. Evidence: Rated −40°C to +125°C; thermal cycling, shock and vibration tests will reveal frequency shifts—expect frequency versus temperature slopes of several ppm/°C depending on cut and package. Explanation: For automotive use, run thermal cycling and vibration tests and track frequency drift; apply derating margins when frequency stability across extremes is critical.
Test & measurement guidance
How to measure ESR and frequency reliably
Point: Accurate ESR and resonance frequency measurement requires the right fixture and calibration. Evidence: Use a low-capacitance test fixture or solder to a 50 Ω test board, measure with a precision LCR meter at the series-resonant frequency or use a crystal tester with series-resonance mode; calibrate out fixture capacitance and series resistance. Explanation: Avoid two-wire measurements that include lead inductance; when measuring a 24MHz crystal, ensure the instrument bandwidth and calibration account for small reactances to keep tolerances within specified limits.
Design integration checklist
Oscillator circuit & load capacitance selection
Point: Correct external capacitors achieve the specified 8 pF load and stable oscillation. Evidence: Effective load formula: Ceq = (C1·C2)/(C1+C2) + Cstray.
Example calculations:
- ✅ Scenario A: If Cstray≈2 pF, choose C1=C2=12 pF → Ceq≈6 pF+2 pF stray ≈ 8 pF (Target Met).
- ⚠️ Scenario B: If C1=C2=15 pF → Ceq≈7.5 pF+2 pF ≈ 9.5 pF (Frequency will shift slightly low).
Explanation: Provide three worked examples for common stray values and include ±10% capacitor tolerance margins to maintain frequency within system error budgets for the 24MHz crystal.
Summary
Point: Essential facts for designers: the VXM7A-9001-24M0000000TR is a 24MHz crystal with an 8 pF load cap, ~100 Ω ESR, SMD 3.2×2.5 mm footprint and −40°C to +125°C rating — figures that directly affect oscillator startup and stability. Evidence: These numbers determine oscillator loop gain, required external cap selection, and qualification tests needed for automotive or industrial use. Explanation: Verify oscillator IC negative resistance compatibility and include ESR/frequency tests in production sampling to avoid field failures.
- Verify oscillator compatibility with the part’s ESR and drive level before PCB commit; adjust external caps using Ceq formula to hit 8 pF load.
- Set up ESR and frequency qualification tests with a soldered reference board and automated logging to capture batch variation and measurement uncertainty.
- Follow the PCB layout checklist: short traces, caps close to pins, guard traces for EMI, and NP0/C0G capacitors for minimal drift.
Meta title: VXM7A-9001-24M0000000TR 24MHz Crystal — Full Spec & Design Report
Meta description: Comprehensive technical guide for VXM7A-9001-24M0000000TR 24MHz crystal. Includes ESR, load capacitance, automotive temp range, and PCB layout checklist for engineers.
