RP173N301B-TR-F - 150mA 3.0V LDO Regulator | Nisshinbo
料号： RP173N301B-TR-F ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.78 | $0.78 |
| 10 | $0.69 | $6.90 |
| 100 | $0.55 | $55.00 |
| 500 | $0.45 | $225.00 |
| 1,000 | $0.39 | $390.00 |
| 3,000 | $0.32 | $960.00 |
RP173N301B-TR-F 概述
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only marginally higher than the regulated output. Within the broader power-management hierarchy, LDOs sit beneath switching DC-DC converters in efficiency but offer lower output noise, faster transient response, smaller PCB area, and fewer external components. The RP173 belongs to the linear regulator family of PMICs (power management ICs) and is typically deployed as a post-regulator stage that cleans up the residual ripple of an upstream switching converter, or as a primary rail in low-current battery-powered systems where noise immunity is more important than conversion efficiency.
Key features of the RP173N301B-TR-F include a 3.0 V fixed output trimmed at the factory (no external feedback resistors required), typical quiescent current in the microampere range, an integrated reverse-current blocking circuit that prevents current backflow when VIN falls below VOUT, internal current limiting and thermal shutdown, and a stable operation profile with small ceramic output capacitors. The CE logic enables the output when asserted high, supporting power-sequenced multi-rail systems.
Architecturally, the RP173 uses a CMOS pass element rather than a PNP bipolar transistor, which keeps quiescent current low and dropout voltage competitive at moderate loads. The internal bandgap reference and error amplifier set the line and load regulation, while the reverse-current block uses a dedicated control loop to detect and disable the pass element whenever VOUT exceeds VIN, a feature rarely found in comparable sub-1 mm-thickness SOT-23-5 LDOs.
Typical applications include microcontroller and MCU core-logic rails in IoT and wearable designs, sensor bias supplies for industrial control modules, backup-battery OR-ing outputs in portable medical and e-meter designs, post-regulation for switching converters in noise-sensitive RF receivers, and as a low-cost local regulator in USB-powered consumer devices. In each case, the 150 mA rating and 3.0 V output are matched to low-power digital or analog sub-systems rather than to high-current power stages.
A key design consideration is that although the absolute maximum input voltage is 11 V, dropout must be respected at full load: at 150 mA the typical dropout is approximately 0.36 V, so the input rail must remain above approximately 3.36 V under worst-case load and temperature to keep the output in regulation. Designers should also leave adequate copper area for thermal dissipation, since a 5 V-to-3.0 V conversion at 150 mA still dissipates around 0.3 W.
This page synthesizes distributor stock and pricing data, pin-compatible Nisshinbo RP173x family variants, drop-in alternatives from alternative brands, and practical thermal / PCB layout notes that go beyond the manufacturer datasheet's typical-application section.
直接替换替代料： RP173N301B-TR-F ——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：
RP173N301D-TR-F
✅ 直接替换📋 参考替代料（不在目录中）
RP173N331B-TR-F
✅ 直接替换📋 参考替代料（不在目录中）
RP173N281B-TR-F
✅ 直接替换📋 参考替代料（不在目录中）
RP173N121A-TR-F
✅ 直接替换📋 参考替代料（不在目录中）
RP130N451B-TR-F
✅ 直接替换📋 参考替代料（不在目录中）
MIC5205-3.0YM5-TR
✅ 直接替换📋 参考替代料（不在目录中）
LP2985-30DBVR
✅ 直接替换📋 参考替代料（不在目录中）
RP173N301B-TR-F 最大额定值与电气特性
| Manufacturer | Nisshinbo Micro Devices (formerly RICOH Electronic Devices) |
| 功能 | Linear Voltage Regulator (LDO), Positive Fixed |
| 输出配置 | Fixed, single output |
| 输出电压 | 3.0 V |
| 最大输出电流 | 150 mA |
| 输入电压范围 | Up to 11 V (max) |
| Dropout Voltage (typical) | 0.36 V at 150 mA |
| Reverse-Current Protection | Yes (built-in) |
| 热关断 | Yes (internal) |
| 工作结温 | -40C to +105C |
| 封装 | SOT-23-5 (SOT-753 / SC-74A) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 |
| RoHS 状态 | Compliant |
| Packaging | Tape & Reel, 3000 pcs/reel |
RP173N301B-TR-F 引脚配置
| 引脚 1 | VIN — Input supply voltage (up to 11 V absolute max) |
| 引脚 2 | GND — Common ground reference |
| 引脚 3 | CE — Chip enable, active-high for the B variant |
| 引脚 4 | NC — Not connected (per datasheet) |
| 引脚 5 | VOUT — Regulated 3.0 V output, up to 150 mA |
典型应用
RP173N301B-TR-F 适用于 6 应用s: MCU Core-Logic Rail in IoT Devices, Sensor Bias Supply in Industrial Modules, Backup-Battery OR-ing Output, Post-Regulator for Switching Converters, USB-Powered Consumer Device Regulator, Portable Medical Wearable Module.
MCU Core-Logic Rail in IoT Devices
The RP173N301B-TR-F is a strong fit as a 3.0 V MCU core-logic rail in IoT endpoints, where its 150 mA rating easily covers the peak current of low-power ARM Cortex-M0+ and RISC-V SoCs at 48-72 MHz. The device's low quiescent current preserves battery life during sleep, while the integrated reverse-current protection prevents back-feed from the MCU's I/O pins into the regulator output when the system bus is hot-plugged. In a typical BLE wearable, place the RP173 between a Li-ion cell (3.0-4.2 V) and the SoC's VDD pin, with a 1 uF X5R ceramic input capacitor and a 1 uF X5R output capacitor placed within 2 mm of the package.
推荐
Sensor Bias Supply in Industrial Modules
For industrial 4-20 mA loop, PLC analog input, and sensor-conditioning modules, the RP173N301B-TR-F provides a clean 3.0 V bias for analog front-ends such as op-amps, ADC references, and bridge-sensor excitation. Its 11 V absolute-maximum input safely accepts a regulated 5 V or 9 V industrial backplane rail, while its -40C to +105C junction range covers factory-floor temperature swings. The 150 mA output easily supports multiple analog channels; combine the RP173 with a low-noise external reference such as the OPA2170 for the highest-precision measurements. Designers should add a 10 uF bulk capacitor at the input for immunity to backplane transients.
推荐
Backup-Battery OR-ing Output
The built-in reverse-current blocking circuit in the RP173N301B-TR-F makes it ideal as the OR-ing output of a primary supply and a backup coin-cell or super-capacitor in memory-retention and RTC backup topologies. When the main rail collapses below 3.0 V, the RP173 automatically blocks reverse current from the backup source into the regulator, while still supplying the RTC and SRAM. The 3.0 V output directly matches common RTC ICs and many SRAM retention voltages, eliminating a second regulator stage. Place a Schottky diode in parallel for higher inrush if the backup source has a long cable.
推荐
Post-Regulator for Switching Converters
Cascade the RP173N301B-TR-F after a step-down switching converter to create a clean 3.0 V rail for noise-sensitive digital sub-systems. The switching converter handles the bulk voltage drop with high efficiency, while the RP173 strips residual switching ripple and provides a low-noise output for ADCs, DACs, or audio codecs. The 150 mA rating covers typical sub-system loads and the device's 11 V input comfortably accepts 5 V or 3.3 V switching pre-regulator outputs. Add a small LC pi-filter between stages for maximum ripple attenuation in sensitive analog chains.
推荐
USB-Powered Consumer Device Regulator
In USB-powered accessories such as HID peripherals, dongles, and small consumer gadgets, the RP173N301B-TR-F acts as a local 3.0 V regulator from the 5 V USB VBUS rail. Its 11 V absolute-max input tolerates USB inrush transients, and the 150 mA output is well matched to low-power MCUs, LED drivers, and wireless transceivers in this category. Designers should add a 4.7 uF bulk capacitor at the input to absorb USB hot-plug surges and a 1 uF ceramic capacitor at the output within 2 mm of the VOUT pin. The reverse-current block protects the host port when the device is unpowered.
推荐
Portable Medical Wearable Module
For wearable health monitors such as heart-rate patches, continuous-glucose monitors, and pulse-oximeter finger probes, the RP173N301B-TR-F provides a clean 3.0 V rail for analog sensor front-ends and low-power BLE radios. Its microampere-level quiescent current preserves battery life during sleep cycles, and the small SOT-23-5 footprint enables compact, comfortable form factors. The integrated reverse-current block is particularly valuable during battery hot-swap, preventing the coin-cell backup from back-feeding the main rail. Combine the RP173 with a low-power analog front-end such as the AFE4490 for a complete wearable signal chain.
推荐
推荐产品汇总
工程参考数据： RP173N301B-TR-F ——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 | RP173N301D-TR-F | RP173N331B-TR-F | RP173N281B-TR-F | RP173N121A-TR-F | MIC5205-3.0YM5-TR | LP2985-30DBVR |
|---|---|---|---|---|---|---|---|
| Brand | Nisshinbo Micro Devices | Nisshinbo Micro Devices | Nisshinbo Micro Devices | Nisshinbo Micro Devices | Nisshinbo Micro Devices | Microchip Technology | Texas Instruments |
| Package | SOT-23-5 (SOT-753) | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same |
| Output Voltage | 3.0 V | 3.0 V | 3.3 V | 2.8 V | 1.2 V | 3.0 V | 3.0 V |
| Maximum Output Current | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA |
| Maximum Input Voltage | 11 V | 11 V | 11 V | 11 V | 11 V | 16 V | 16 V |
| CE Polarity | Active-high (B suffix) | Active-low (D suffix) | Active-high | Active-high | Active-high | No CE / always-on | Active-high (pin 3) |
| Operating Junction Temperature | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +125C | -40C to +125C |
关键差异点
- Built-in reverse-current protection （对比 LP2985-30DBVR)
- Active-high enable option within same family （对比 RP173N301D-TR-F)
- Wide output voltage family coverage （对比 MIC5205-3.0YM5-TR)
设计说明
Estimated: at VIN = 5 V, VOUT = 3.0 V, IOUT = 150 mA, power dissipation is approximately (5 - 3.0) x 0.15 = 0.30 W. With a typical SOT-23-5 theta_JA of about 250 C/W on a 1 oz 4-layer board, the junction rise above ambient is roughly 75 C - well within the +105 C junction limit. For continuous full-load operation in an enclosed chassis, attach the GND pin to a copper pour of at least 100 mm^2 to keep Tj below 85 C at 50 C ambient.
Place the 1 uF input and 1 uF output ceramic capacitors within 2 mm of the VIN and VOUT pins respectively, using the ground plane as the return path. Use X5R or X7R dielectric to minimize capacitance derating at temperature. A 0.1 uF HF bypass in parallel with the bulk output cap can further reduce high-frequency noise. Keep the CE pin trace short and avoid routing it near switching nodes.
Do not operate VIN above 11 V absolute maximum - transients above this level can permanently damage the pass element. Also verify that VIN - VOUT stays above the dropout (approximately 0.36 V at 150 mA) under worst-case load and temperature; many designers overlook this when powered from a Li-ion cell near end-of-discharge (3.0 V). Finally, note that the CE pin must not be left floating - tie it to VIN through a 100 kohm resistor if always-on operation is desired.
合规信息
RoHS and REACH compliant per Nisshinbo product page; not AEC-Q100 qualified - operating junction temperature is -40C to +105C, not the full automotive -40C to +125C range. Standard part is lead-free and halogen-free.
