SIT1602BC-22-33S-38.000000 - 38 MHz MEMS LVCMOS XO | SiTime
料号： SIT1602BC-22-33S-38.000000 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.28 | $12.80 |
| 100 | $1.05 | $105.00 |
| 500 | $0.88 | $440.00 |
| 1,000 | $0.74 | $740.00 |
| 3,000 | $0.58 | $1,740.00 |
SIT1602BC-22-33S-38.000000 概述
An XO (crystal oscillator) is a self-contained timing device that delivers a stable square-wave reference clock to digital logic, MCUs, FPGAs, SoCs, and serializer/deserializer (SerDes) channels. In the broader taxonomy, an XO sits below the TCXO/VCTCXO/OCXO classes and above a bare quartz crystal: a quartz crystal alone cannot drive a load, whereas an XO combines the resonator with an amplifier and output buffer in one package. MEMS oscillators such as the SiT1602 family replace legacy quartz with silicon micro-electromechanical resonators, improving shock/vibration tolerance and shortening lead times.
Key features of the SIT1602BC-22-33S-38.000000 include ±25 ppm frequency stability over -20 °C to +70 °C, total stability as low as ±20 ppm across the wider -40 °C to +85 °C operating range, 100% pin-to-pin compatibility with quartz-based XO footprints, and a standby current that preserves battery life. The 38 MHz output is a commonly required reference for Ethernet PHYs, USB 2.0 controllers, and mid-speed MCU peripherals.
The SiT1602B architecture pairs a silicon MEMS resonator with a programmable analog ASIC and LVCMOS driver, achieving faster start-up than typical quartz oscillators while eliminating the quartz crystal's susceptibility to shock. Its 4.5 mA active supply current makes it suitable for always-on or battery-backed designs.
Typical applications include Ethernet PHY reference clocks, USB 2.0 full-speed clocks, MCU/MPU clock trees, portable industrial handheld terminals, and consumer audio/video peripherals. The wide 1.8-3.3 V continuous supply range also allows a single BOM configuration across multiple rails, simplifying inventory.
When designing in the SIT1602BC-22-33S-38.000000, place a 0.1 µF decoupling capacitor within 2 mm of the VDD pin and keep the output trace short to minimise reflections on this fast-edged LVCMOS signal. For standby control, drive the ST pin logic-low to enter power-down.
This page synthesizes distributor stock, drop-in SiT1602 alternatives, and practical design notes beyond the manufacturer datasheet for engineers evaluating the 38 MHz fixed-frequency MEMS XO option.
直接替换替代料： SIT1602BC-22-33S-38.000000 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
SIT1602BC-22-33N-38.000000
✅ 直接替换📋 参考替代料（不在目录中）
SIT1602BC-23-33S-38.000000
✅ 直接替换📋 参考替代料（不在目录中）
SIT1602BC-82-33S-38.000000
✅ 直接替换📋 参考替代料（不在目录中）
SIT1602BC-22-33S-38.400000
✅ 直接替换📋 参考替代料（不在目录中）
ECS-2333B-380-BN
✅ 直接替换📋 参考替代料（不在目录中）
ASTMHTA-38.000MHZ-XR-E
✅ 直接替换📋 参考替代料（不在目录中）
SIT1602BC-22-33S-38.000000 规格参数
| Device Type | MEMS XO (Standard) LVCMOS Oscillator |
| Frequency | 38.000000 MHz |
| 输出类型 | HCMOS / LVCMOS |
| Supply Voltage (Nominal) | 3.3 V |
| Supply Voltage Range | 1.8 V to 3.3 V continuous |
| Frequency Stability | ±25 ppm (over -20 °C to +70 °C) |
| Total Frequency Stability | as low as ±20 ppm |
| Active Supply Current (Typ) | 4.5 mA |
| Standby Function | Yes (Power Down) |
| 封装 | 4-SMD, No Lead, 3.2 x 2.5 mm |
| 安装类型 | Surface Mount |
| 工作温度范围 | -20 °C to +70 °C |
| Frequency Range Supported by Family | 3.57 MHz to 77.76 MHz |
| Pin-to-Pin Quartz Replacement | Yes (100% pin-compatible) |
| RoHS 状态 | Compliant |
SIT1602BC-22-33S-38.000000 引脚配置
| 引脚 1 | ST — Standby (active-high logic-high = enable; logic-low = power down) |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | OUT — LVCMOS/HCMOS clock output, 38.000000 MHz |
| 引脚 4 | VDD — Supply voltage, 1.8 V to 3.3 V continuous |
典型应用
SIT1602BC-22-33S-38.000000 适用于 7 应用s: Ethernet PHY Reference Clock, USB 2.0 Full-Speed Peripheral Clock, MCU/MPU Clock Tree, Industrial Handheld Terminal, Consumer Audio/Video Peripheral, IoT Sensor Hub, Test & Measurement Front-End.
Ethernet PHY Reference Clock
The SiTime SIT1602BC-22-33S-38.000000 delivers a 38.000 MHz LVCMOS reference clock with ±25 ppm stability and 4.5 mA active current, well suited as the timing reference for Ethernet PHYs and mid-speed MCU peripherals. Placed at the PHY's REFCLK/XTAL1 pin with a 0.1 µF decoupling cap on VDD within 2 mm, it provides a clean-edged CMOS square wave that the PHY multiplies internally for 25 MHz MII/RMII or 125 MHz GMII operation. The SiT1602 family is 100% pin-to-pin compatible with legacy 3.2x2.5 mm quartz XO footprints, simplifying PCB reuse for industrial Ethernet designs.
推荐
USB 2.0 Full-Speed Peripheral Clock
The SIT1602BC-22-33S-38.000000's 38 MHz LVCMOS output, ±25 ppm total stability and 1.8-3.3 V continuous supply make it a robust reference for USB 2.0 full-speed controllers and embedded MCU peripherals that derive internal 48 MHz USB clocks via PLL multiplication. The 4.5 mA typical active current keeps total system power low, while the standby pin enables wake-on-USB designs in battery-powered peripherals. The MEMS architecture is more shock-tolerant than equivalent quartz XOs, which is critical for handhelds, wearables, and industrial tablets.
推荐
MCU/MPU Clock Tree
For MCU and MPU clock trees, the SIT1602BC-22-33S-38.000000 provides a stable 38 MHz LVCMOS reference that internal PLLs multiply to higher CPU and peripheral frequencies. Per the SiT1602 datasheet, the device's fast start-up time and 1.8-3.3 V continuous supply simplify designs that previously needed separate 1.8 V and 3.3 V oscillators. Place the output trace under 10 mm and keep it away from switching power inductors to maintain jitter performance; the 4.5 mA supply current adds negligible thermal load to the system.
推荐
Industrial Handheld Terminal
Industrial handheld terminals benefit from the SIT1602BC-22-33S-38.000000's MEMS shock tolerance, wide -20 to +70 °C operating range, and 3.2x2.5 mm small footprint. The standby pin enables deep sleep current reduction between scans, preserving battery life during intermittent barcode or RFID reads. Unlike quartz, the MEMS resonator survives repeated 1500 g mechanical shocks typical of drops onto concrete, extending field reliability per SiTime's qualification data cited in the SiT1602 datasheet.
推荐
Consumer Audio/Video Peripheral
The SIT1602BC-22-33S-38.000000's low 4.5 mA active supply current and small 3.2x2.5 mm package suit consumer AV peripherals such as HDMI bridges, video capture dongles, and set-top box front-end controllers. Per the SiT1602 datasheet, the SiT1602B family achieves 100% pin-to-pin compatibility with quartz XOs, allowing cost-down redesigns. Its LVCMOS output and ±25 ppm stability are more than sufficient for audio/video reference clocks that downstream PLLs further condition.
推荐
IoT Sensor Hub
For IoT sensor hubs combining Wi-Fi, BLE, and edge sensing, the SIT1602BC-22-33S-38.000000's 1.8-3.3 V continuous supply enables a single BOM entry for both radio and host-MCU rails. The standby pin ties into the MCU's deep-sleep controller, dropping the oscillator's contribution to standby power. Per the SiTime SiT1602 datasheet, the MEMS-based start-up is faster than typical quartz XOs, accelerating wake-from-sleep latency and improving overall IoT node battery life.
推荐
Test & Measurement Front-End
Test and measurement front-ends benefit from the SIT1602BC-22-33S-38.000000's ±25 ppm total stability and clean LVCMOS edges for clocking ADC/DAC front-ends and FPGA reference inputs. While not a TCXO, its stability is sufficient for production-test rack applications where the downstream measurement IC performs its own calibration. The 3.3 V supply aligns with most FPGA and high-speed ADC bank supplies, simplifying power-rail planning around a single 3.3 V LDO.
推荐
推荐产品汇总
工程参考数据： SIT1602BC-22-33S-38.000000 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SIT1602BC-22-33N-38.000000 | SIT1602BC-23-33S-38.000000 | SIT1602BC-82-33S-38.000000 | SIT1602BC-22-33S-38.400000 | ECS-2333B-380-BN | ASTMHTA-38.000MHZ-XR-E |
|---|---|---|---|---|---|---|---|
| Brand | SiTime | SiTime | SiTime | SiTime | SiTime | ECS Inc. | Abracon |
| Package | 4-SMD, 3.2x2.5 mm | 4-SMD, 3.2x2.5 mm (same) | 4-SMD, 3.2x2.5 mm (same) | 4-SMD, 3.2x2.5 mm (same) | 4-SMD, 3.2x2.5 mm (same) | 4-SMD, 3.2x2.5 mm (same) | 4-SMD, 3.2x2.5 mm (same) |
| Frequency | 38.000000 MHz | 38.000000 MHz | 38.000000 MHz | 38.000000 MHz | 38.400000 MHz | 38.000 MHz | 38.000 MHz |
| Supply Voltage | 1.8 V to 3.3 V (3.3 V nom) | 1.8 V to 3.3 V | 1.8 V to 3.3 V | 1.8 V to 3.3 V | 1.8 V to 3.3 V | 3.3 V | 3.3 V |
| Standby Function | Yes (ST pin) | No (Pin 1 NC) | Yes | Yes | Yes | Yes (typical) | Yes (typical) |
| Resonator Technology | MEMS | MEMS | MEMS | MEMS | MEMS | Quartz | MEMS |
关键差异点
- MEMS resonator for higher shock tolerance （对比 ECS-2333B-380-BN (quartz))
- Standby (ST) pin enables power-saving designs （对比 SIT1602BC-22-33N-38.000000)
- Single-BOM 1.8 V to 3.3 V continuous supply （对比 Abracon ASTMHTA-38.000MHZ-XR-E)
- 100% pin-to-pin compatibility with quartz XO footprints （对比 ECS-2333B-380-BN)
设计说明
Place a 0.1 µF X7R ceramic decoupling capacitor within 2 mm of the VDD pin (pin 4) and tie the GND pin (pin 2) directly to the ground plane with a short via. Keep the OUT trace under 10 mm to avoid reflections; the LVCMOS edge rate is sub-1 ns and excessive trace length will degrade the duty cycle seen at the receiver.
The SIT1602BC-22-33S-38.000000 has a continuous 1.8-3.3 V supply range. For stable start-up, ensure the VDD rail rise time is monotonic and free of large glitches; a soft-start ramp on the LDO feeding the oscillator is recommended. Driving the ST pin logic-low before VDD is stable avoids undefined OUT behavior during power sequencing.
Series-terminate the OUT trace with a 22-33 Ω resistor close to the oscillator pin when the load is more than 50 mm away or when driving a high-capacitance clock-input pin. This damps the LVCMOS edge ringing. Avoid routing the OUT trace parallel to switching-power traces for at least 3 trace-widths of separation to minimise coupling.
Do not place the SIT1602BC-22-33S-38.000000 directly under or beside a switching-mode regulator or near a heat source; thermal gradients across the 3.2x2.5 mm package can shift the resonator frequency by tens of ppms. Also avoid placing a shield can tightly over the part - mechanical stress detunes MEMS resonators far more than quartz crystals.
合规信息
RoHS compliant per SiTime product page. Not AEC-Q100 qualified in the standard SiT1602B family; SiTime does not list this MPN in their automotive-qualified catalog. For AEC-Q100 oscillator needs, consider SiTime SiT8920/SiT8918 automotive MEMS families.
