ST730M50R - 300mA 28V LDO Regulator, 5V Fixed Output | ST | STMicroelectronics
부품 번호: ST730M50R ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $1.1 | $1.10 |
| 10 | $0.96 | $9.60 |
| 100 | $0.82 | $82.00 |
| 500 | $0.69 | $345.00 |
| 1,000 | $0.58 | $580.00 |
| 3,000 | $0.48 | $1,440.00 |
ST730M50R 개요
An LDO (Low-Dropout) linear regulator is a class of voltage regulator that maintains a tightly regulated output voltage even when the input voltage approaches the output voltage - the so-called dropout condition. LDOs sit one rung below the broader linear-regulator family, which itself is a subset of voltage regulators and ultimately of power management ICs (PMICs). Unlike switching converters, LDOs do not introduce switching ripple into the output rail, which is the central reason engineers select them for noise-sensitive analog supply pins.
Key differentiating features include the 28 V maximum input rating (well above the common 5 V or 12 V rails), the very low 5 µA quiescent current that preserves standby battery life, and 600 mV typical dropout that lets the LDO regulate cleanly even on depleted battery or under varying load transients. The internal current-limit foldback and 165 °C thermal-shutdown threshold (typical) defend the die against overload and PCB hot-spots. Output voltage accuracy is specified at +/-2 percent over line, load, and temperature.
Architecturally the ST730M50R is a PMOS-pass LDO with a high-impedance feedback divider, bandgap reference, and error amplifier. The PMOS topology provides low dropout and inherent short-circuit protection through Rds(on) self-limiting, while the bandgap reference delivers temperature-stable 5 V with low noise density on the output pin.
Typical applications include 24 V industrial sensor biasing, after-market automotive accessories (e.g., dashcams and alarms), microcontroller and wireless-module always-on rails, low-power IoT nodes powered directly from 12 V batteries, and post-regulation stages that clean up switching-converter outputs for analog subsections. The wide input range also lets the same part cover both 12 V and 24 V industrial bus systems, simplifying BOM management.
Designers should pay close attention to thermal dissipation: at VIN = 24 V, VOUT = 5 V and 300 mA, the device dissipates roughly 5.7 W and requires either a copper-cooling pour or the larger SOT-23-5 land pattern with thermal vias. Use a 1 µF X7R ceramic on the input and a 2.2 µF X7R ceramic on the output placed within a few millimetres of the pins - the part is specified for ESR stability up to several hundred milliohms.
This page synthesises distributor pricing, drop-in alternatives, and practical thermal/protection notes drawn from the ST730 datasheet and reference designs - content not assembled on any single manufacturer page.
드롭인 대체품: ST730M50R — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ST730M33R
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ST730M18R
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ST730M36R
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ST730M30R
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ST730M25R
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ST730M50R 최대 정격 & 전기적 특성
| 출력 유형 | Fixed |
| Output Voltage (Nominal) | 5 V |
| 최대 출력 전류 | 300 mA |
| Input Voltage Min | 2.5 V |
| Input Voltage Max | 28 V |
| Dropout Voltage (Typical) | 600 mV at 300 mA |
| Quiescent Current (Typical) | 5 µA |
| Line Regulation | 0.05 percent/V (typical, per datasheet) |
| Load Regulation | 0.005 percent/mA (typical, per datasheet) |
| Output Voltage Accuracy | +/-2 percent over line/load/temperature |
| 동작 온도 범위 | -40 C to +125 C |
| 패키지 | SOT-23-5 |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 1 |
| Protection Features | Current limit, short-circuit, thermal shutdown |
| Thermal Shutdown Threshold (Typical) | 165 C |
| RoHS 상태 | Compliant |
| Recommended Output Capacitor | 2.2 µF X7R ceramic |
| Recommended Input Capacitor | 1 µF X7R ceramic |
ST730M50R 핀 구성
| 핀 1 | VIN — Input voltage (2.5 V to 28 V) |
| 핀 2 | GND — Ground reference |
| 핀 3 | EN — Enable input (logic-high to enable, tie to VIN if unused) |
| 핀 4 | NC — Not connected (per datasheet) |
| 핀 5 | VOUT — Regulated 5.0 V output |
일반적인 애플리케이션
ST730M50R 적합 용도: 6 애플리케이션s: Industrial 24V Sensor Bias, After-Market Automotive Accessories, Always-On IoT and Wireless Modules, USB Charger / 5V Retrofit from 12-24V, Post-Regulator Cleaning Up Switching Noise, Home Automation and Smart Home Nodes.
Industrial 24V Sensor Bias
The ST730M50R's 28 V maximum input and 5.0 V fixed output bias industrial 24V sensor arrays from a single rail without a preregulator, simplifying BOM and reducing PCB area. Its 5 microampere quiescent current minimises standby drain on loop-powered or battery-backed sensor nodes, while 300 mA continuous output drives multiple 4-20 mA loop transmitters, RTD signal-conditioning front-ends, and CAN-bus transceivers in parallel. The SOT-23-5 footprint keeps the part out of the way on densely populated PLC backplanes, and the +/-2 percent output accuracy is tight enough to feed precision ADCs without an additional reference. Internal current-limit and thermal-shutdown blocks protect the regulator against field-wiring faults, which are common in factory environments.
추천
After-Market Automotive Accessories
After-market automotive modules such as dashcams, GPS trackers, alarm sirens, and OBD-II dongles frequently derive 5 V directly from the 12 V battery rail, making the ST730M50R a strong fit. Its 28 V transient headroom tolerates jump-start spikes on 12 V systems, and the 600 mV dropout preserves regulation as the battery sags under cranking. 5 microampere quiescent current extends parked-vehicle runtime for always-on telemetry by limiting the parasitic drain on the battery. The SOT-23-5 footprint fits inside the tight plastic housings of consumer-grade auto accessories, while the built-in short-circuit and thermal-shutdown protection reduce warranty returns from wiring faults during DIY installation. Add a small TVS diode on VIN for full automotive-grade transient immunity.
추천
Always-On IoT and Wireless Modules
Battery-powered IoT nodes such as BLE beacons, LoRaWAN sensors, and Zigbee switches need a regulator that adds negligible standby drain - the ST730M50R's 5 microampere quiescent current lets a node sleep for months on a single CR2032 or 2x AA pack. Its 28 V input ceiling lets the same module accept a wide range of harvested sources including 12 V solar panels and 24 V PoE auxiliary rails. Dropout of 600 mV at 300 mA still leaves headroom for operation at the low end of discharge, and 5 V output is ideal for feeding downstream buck converters that then power the wireless SoC at 3.3 V. The wide -40 to +125 C operating temperature also supports outdoor enclosures without derating.
추천
USB Charger / 5V Retrofit from 12-24V
Retrofitting a USB 5V charging port onto a 12 V motorcycle or 24 V industrial vehicle is straightforward with the ST730M50R. The 28 V input ceiling tolerates the worst-case load-dump on a 12 V system and the regulated 5 V output goes straight into a USB Type-A or Type-C connector through a CC-controller IC. The 300 mA output supports BC1.2 charging current limited by USB standard, and the SOT-23-5 footprint fits in handlebar-mounted accessory modules. Internal current-limit protects against short-circuited USB cables and downstream failures, while the 5 microampere Iq ensures the retrofit does not drain the battery when the vehicle is parked.
추천
Post-Regulator Cleaning Up Switching Noise
When a board already uses a switching converter for high-current rails but needs a clean 5 V tap for an analog block, the ST730M50R serves as an inexpensive post-regulator that strips out residual switching ripple. Placed between the switcher's 5 V output and noise-sensitive loads such as analog ADCs, MEMS microphones, or audio DACs, the LDO adds the LDO-class PSRR ripple rejection with no efficiency penalty at the small downstream load. Its 5 microampere Iq is negligible compared to the upstream converter's quiescent draw, and the SOT-23-5 footprint drops next to the analog pins for the shortest possible PCB trace to VOUT.
추천
Home Automation and Smart Home Nodes
Smart-home bridges, Zigbee or Z-Wave coordinators, and Wi-Fi smart switches commonly take 24 V AC or DC from a wall transformer and need an internal 5 V rail to power the radio and microcontroller - a perfect fit for the ST730M50R's 28 V maximum input. The 5 microampere Iq is a major advantage for battery-backed smart sensors that sit idle for days between transmissions. Inside a wall-switch form factor the SOT-23-5 footprint fits behind the relay, sharing copper pour with the high-voltage circuitry thanks to the part's internal isolation discipline. The +/-2 percent output accuracy lets a single regulator feed both the radio and a low-power LED indicator without separate rails.
추천
추천 제품 요약
엔지니어링 참조 데이터: ST730M50R — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ST730M33R | ST730M18R | ST730M36R | ST730M30R | ST730M25R |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | SOT-23-5 | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same |
| Output Voltage (Fixed) | 5.0 V | 3.3 V | 1.8 V | 3.6 V | 3.0 V | 2.5 V |
| Maximum Output Current | 300 mA | 300 mA | 300 mA | 300 mA | 300 mA | 300 mA |
| Input Voltage Range | 2.5 V to 28 V | 2.5 V to 28 V | 2.5 V to 28 V | 2.5 V to 28 V | 2.5 V to 28 V | 2.5 V to 28 V |
| Dropout Voltage (Typical) | 600 mV at 300 mA | 600 mV at 300 mA | 600 mV at 300 mA | 600 mV at 300 mA | 600 mV at 300 mA | 600 mV at 300 mA |
| Quiescent Current (Typical) | 5 µA | 5 µA | 5 µA | 5 µA | 5 µA | 5 µA |
| Operating Temperature Range | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Output Voltage Accuracy | +/-2 percent | +/-2 percent | +/-2 percent | +/-2 percent | +/-2 percent | +/-2 percent |
| Approximate Unit Price (qty 1000) | 0.58 USD | 0.58 USD | 0.58 USD | 0.58 USD | 0.58 USD | 0.58 USD |
주요 차별점
- Wide 28 V input ceiling tolerates 24 V industrial and load-dump-prone 12 V automotive rails without external preregulation (vs ST730M33R)
- 5 microampere quiescent current is one of the lowest in the 28 V / 300 mA SOT-23-5 LDO class (vs ST730M18R)
- PMOS pass architecture yields only 600 mV dropout at full load, well below the 1-1.5 V typical of older NPN regulators (vs ST730M30R)
설계 노트
At VIN = 24 V, VOUT = 5 V and 300 mA load the regulator dissipates (24 - 5) * 0.3 = 5.7 W. The SOT-23-5 package cannot sink this heat on its own - the part will reach the 165 C thermal-shutdown threshold within seconds and begin to cycle. For 24 V to 5 V at the full 300 mA, either derate the load to roughly 60 mA or place the LDO after a buck pre-regulator. Add a copper pour under the GND pin and stitch thermal vias to the inner/inner2 layer to maximise heat extraction in 5 V-from-12 V applications where dissipation stays below 2 W.
Place the input 1 µF X7R ceramic capacitor within 1-2 mm of the VIN pin and the output 2.2 µF X7R ceramic within 1-2 mm of VOUT. Keep both ground returns to the GND pin with short, wide traces or a dedicated via farm. Avoid routing noisy digital signals or switcher traces adjacent to VOUT - the high-impedance feedback divider is sensitive to injected noise. The SOT-23-5 land pattern should follow the JEDEC MO-178 standard with extended thermal pads on the GND pin pour to maximise heat extraction.
Do not operate above 28 V on VIN - the part will enter permanent over-voltage stress even though the absolute-maximum rating is 30 V, leaving no transient margin. Avoid leaving the EN pin floating: tie it to VIN through a 100 kohm resistor if the enable function is unused, otherwise the regulator state at power-up is undefined and the output may glitch. The output capacitor ESR must remain within the stability window of approximately 0.01 ohm to 1 ohm - X7R ceramics in 2.2 µF are typical. Do not parallel two 5 V LDOs to share current - they will share unevenly and one may enter thermal shutdown.
For after-market automotive or industrial 24 V applications, add a TVS diode (e.g., SMAJ28CA or SMBJ28A) on VIN close to the IC to absorb fast transients above 30 V. Place a series ferrite bead or input resistor if the source has high dv/dt ringing. The enable pin, if used, should be driven by a clean logic-level signal; routing near switching nodes will inject ripple into the internal reference and degrade output noise. Always check the datasheet's reference layout for thermal-via stitching under the GND pad when designing for full 300 mA loads.
규정 준수 정보
RoHS and REACH compliant per ST product page. Industrial-grade -R suffix; not AEC-Q100 qualified. For AEC-Q100 automotive designs, source a different part number from ST's automotive-grade portfolio.
