NX3225GA-25.000M-STD-CRG-2 - 25MHz 8pF SMD Crystal | NDK
MPN： NX3225GA-25.000M-STD-CRG-2 ✓ 啟用中NX3225GA-25.000M-STD-CRG-2 概覽
A crystal unit is a passive frequency-control component that uses the mechanical resonance of a quartz blank to generate a highly stable reference frequency. Within the timing-signal hierarchy, the crystal sits at the base of every clock chain: crystal unit -> Pierce oscillator circuit -> MCU/PLL system clock -> full digital system. Unlike crystal oscillators (XO/TCXO), a bare crystal requires the oscillator circuit integrated in the host MCU or chipset to operate.
Key features of the NX3225GA series include an ultra-compact and thin 0.75 mm profile suited to dense layouts, excellent heat and shock resistance for harsh environments, and fundamental-mode operation at 25 MHz. The 8 pF load capacitance allows small, inexpensive loading capacitors, and the 50 ohm ESR supports reliable oscillation start-up with most MCU on-chip inverters.
The device uses an AT-cut fundamental-mode quartz resonator with a hermetically sealed ceramic SMD package. NDK manufactures and supplies these crystals with advanced technology and thorough quality control, and this suffix (-CRG-2) is specified for automotive-relevant applications per the series ordering code.
Typical applications include microcontroller clock references for automotive body and powertrain ECUs, CAN/LIN network nodes, industrial control boards, and AV/office-automation equipment where a 25 MHz reference feeds USB, Ethernet PHYs, or PLL synthesizers.
When designing the Pierce circuit, match the external loading capacitors so that their series combination equals 8 pF (typically two 15 pF capacitors minus stray capacitance), and verify negative resistance margin of at least 5x ESR for reliable start-up.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 NX3225GA-25.000M-STD-CRG-2 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： NX3225GA-25.000M-STD-CRG-2 （相同外形與佔位） — 差異在於 Nominal Frequency, Package Type, Equivalent Series Resistance (ESR), Frequency Stability, Frequency Tolerance.
NX3225GA-25.000M-STD-CRG-1
✅ 直接替換📋 參考替代品（不在目錄中）
NX3225GA-25MHZ-STD-CRG-2
✅ 直接替換聯絡詢價
查看資料表 →STDCRG2-25M
✅ 直接替換📋 參考替代品（不在目錄中）
NX3225GB-25.000M-STD-CRG-1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
NX3225GA-25.000M-STD-CRG-2 規格
| Frequency | 25 MHz |
| Frequency Tolerance | +/-20 ppm at 25C |
| Frequency Stability | +/-30 ppm over -40C to +85C |
| Load Capacitance | 8 pF |
| Equivalent Series Resistance (ESR) | 50 ohm (max) |
| Operating Mode | Fundamental |
| 工作溫度 | -40C to +85C |
| 安裝類型 | Surface Mount |
| Package Dimensions | 3.2 x 2.5 x 0.75 mm |
| Terminations | 4-pad SMD, No Lead |
| Application Grade | Automotive / OA / AV |
| Series | NX3225GA Standard |
NX3225GA-25.000M-STD-CRG-2 腳位配置
| 腳位 1 | XI (Crystal Terminal 1) — Crystal terminal 1 - connect to oscillator inverter input / loading capacitor |
| 腳位 2 | GND — Ground mounting pad (per datasheet land pattern) |
| 腳位 3 | XO (Crystal Terminal 2) — Crystal terminal 2 - connect to oscillator inverter output / loading capacitor |
| 腳位 4 | GND — Ground mounting pad (per datasheet land pattern) |
典型應用
NX3225GA-25.000M-STD-CRG-2 適用於 6 應用s: Automotive ECU Clock Reference, Microcontroller System Clock (MCU Xtal), USB and Ethernet PHY Reference, Industrial Control and PLC Boards, Consumer AV and Office Automation, Battery-Powered IoT and Sensor Nodes.
Automotive ECU Clock Reference
The NX3225GA-25.000M-STD-CRG-2 fits automotive ECU clocking because it sustains +/-30 ppm stability across the full -40C to +85C automotive ambient range and, per NDK, offers excellent heat and shock resistance. In a body-control or gateway ECU, the crystal drives the MCU's internal PLL from which CAN and LIN baud clocks are derived, so the 25 MHz fundamental-mode reference with 8 pF loading keeps bit-timing error well inside CAN tolerance budgets. Placed close to the MCU XTAL pins with a guard ground and the two 15 pF loading capacitors, the 50 ohm ESR ensures reliable start-up even at cold crank temperatures.
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Microcontroller System Clock (MCU Xtal)
For general embedded designs, this crystal is the standard external reference for MCU oscillators: the 25 MHz frequency with 8 pF load capacitance is directly supported by most ARM Cortex-M and similar MCUs, and the 50 ohm ESR gives strong start-up margin against the on-chip inverter amplifier. The thin 0.75 mm, 3.2 x 2.5 mm footprint suits both dense two-layer and high-layer-count boards. Because it is a passive crystal, designers add two loading capacitors sized so their series combination plus stray capacitance equals 8 pF, then verify oscillation margin. The +/-20 ppm tolerance keeps UART and timer baud rates accurate without calibration.
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USB and Ethernet PHY Reference
USB 2.0 full-speed/high-speed and 10/100 Ethernet PHYs commonly take a 25 MHz reference, making this crystal a natural fit: its +/-30 ppm stability over -40C to +85C meets USB and IEEE 802.3 clock-accuracy budgets when feeding the PHY's internal PLL multiplier. The 50 ohm ESR supports dependable oscillation start-up in the PHY's integrated amplifier. In layout, keep the crystal within a few millimeters of the PHY XI/XO pins, surround it with ground, and route no high-speed signals under the part; the shielded 4-pad SMD-4 construction with grounded pads 2 and 4 minimizes radiated spurs near the differential pairs.
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Industrial Control and PLC Boards
On PLC, motor-control, and factory-automation boards, timing references must survive vibration, thermal cycling, and wide ambient swings. The NX3225GA-25.000M-STD-CRG-2 addresses this with NDK's heat- and shock-resistant sealed ceramic package and -40C to +85C operation. The 25 MHz reference clocks the main MCU and its PLL for encoder-interface timers and fieldbus communication. With 8 pF loading, low-cost NP0 loading capacitors suffice, and the 0.75 mm height fits under conformal-coating thickness limits. The 50 ohm max ESR keeps the oscillation negative-resistance margin above the required 5x factor even with a series resistor fitted for drive-level limiting.
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Consumer AV and Office Automation
NDK designed the NX3225GA explicitly for OA and AV equipment: the compact 3.2 x 2.5 x 0.75 mm size enables small-sizing of TVs, set-top boxes, printers, and audio peripherals. At 25 MHz, the crystal serves as the USB reference for media players, the system clock for printer engines, and the PLL source for audio DSPs where the +/-30 ppm stability keeps sampling-rate converters locked. Cost matters strongly in this segment, and at roughly $0.19 per unit (as of 2026-09-14) the crystal undercuts MEMS alternatives while the 4-pad no-lead package supports standard reflow assembly with no special handling.
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Battery-Powered IoT and Sensor Nodes
In battery-powered IoT nodes, every microwatt of oscillator circuit matters, and a passive crystal consumes no static current itself - only the MCU's inverter draws power, and at 25 MHz the NX3225GA's 50 ohm ESR allows low drive levels to be used with a series resistor, reducing oscillator current. The -40C to +85C range covers outdoor and industrial sensor deployments, and the +/-30 ppm stability keeps radio (BLE/802.15.4) symbol timing within specification across temperature. Its 3.2 x 2.5 mm footprint and 0.75 mm profile fit coin-cell-sized PCBs, and heat/shock resistance maintains accuracy through reflow and field vibration.
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推薦產品摘要
工程參考資料，適用於 NX3225GA-25.000M-STD-CRG-2 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | NX3225GA-25.000M-STD-CRG-1 | NX3225GA-25MHZ-STD-CRG-2 | STDCRG2-25M | NX3225GB-25.000M-STD-CRG-1 |
|---|---|---|---|---|---|
| Package | 3.2 x 2.5 x 0.75 mm SMD-4, No Lead | 3.2 x 2.5 x 0.75 mm SMD-4 - same | 3.2 x 2.5 x 0.75 mm SMD-4 - same | 4-SMD, No Lead - same footprint | 3.2 x 2.5 x 0.75 mm SMD-4 - same |
| Brand | NDK | NDK | NDK | NDK | NDK |
| Frequency | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
主要差異化特點
- Ultra-thin 0.75 mm profile in standard 3225 footprint (對比NX3225GA-25.000M-STD-CRG-1)
- Automotive-relevant environmental robustness (對比STDCRG2-25M)
- Low 8 pF load capacitance (對比NX3225GB-25.000M-STD-CRG-1)
設計說明
Follow the NDK datasheet land pattern for the 3.2 x 2.5 mm 4-pad package: place the two 8 pF loading capacitors (typically 15 pF NP0 each, minus stray capacitance) within 2 mm of pads 1 and 3, with short direct traces to the MCU XTAL pins. Keep the crystal loop area minimal - no high-speed or switching traces under or beside the crystal - and ground pads 2 and 4 solidly to the PCB ground plane for shielding and mechanical anchoring.
Verify oscillation start-up margin: the Pierce circuit must present negative resistance of at least 5x the 50 ohm maximum ESR across the -40C to +85C range. Estimated: with an MCU inverter gm and a series resistor Rd of 100-470 ohm, compute | -R | = gm/(w^2 * C1 * C2); if margin is insufficient, reduce the loading capacitors' external value within the 8 pF budget or select a lower-ESR crystal variant. Also confirm the crystal drive level stays within the datasheet limit by sizing the series resistor - overdriving accelerates aging and can fracture the 0.75 mm thin blank.
Ordering-code accuracy is the most common pitfall: NDK requires specifying model name, frequency, and specification number, and suffixes such as -CRG-1 vs -CRG-2 encode specification/packing details. Mismatches pass functional testing but can fail incoming inspection. Additionally, do not lay out the crystal for a 2-pad land pattern - the NX3225GA uses 4 pads with two ground pads, and placing this part on a 2-pad footprint misaligns it. Reflow per the datasheet profile; the ceramic package tolerates standard Pb-free reflow but avoid repeated reflow cycles.
合規資訊
Compliance status not stated in provided web data. NDK product pages typically document RoHS/REACH compliance; verify via the NDK NX3225GA datasheet or distributor compliance certificates before release.