AP7370-33W5-7 - 300mA, 3.3V Fixed ULDO Regulator | Diodes Inc
料号： AP7370-33W5-7 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.36 | $3.60 |
| 100 | $0.28 | $28.00 |
| 500 | $0.22 | $110.00 |
| 1,000 | $0.18 | $180.00 |
AP7370-33W5-7 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 very close to the output voltage, dissipating only the difference (VIN - VOUT) multiplied by load current as heat. The AP7370 belongs to the ULDO sub-family — regulators optimized for sub-100 mV dropout at full load — and sits inside the broader hierarchy of linear regulators, voltage regulators, power-management ICs, and semiconductors.
Key features of the AP7370-33W5-7 include a fixed 3.3 V ±1% output accuracy, typically 200 mV dropout at 300 mA load, current-limit fold-back protection, reverse-current blocking when the input falls below the output, and ultra-low quiescent current for always-on battery applications. The SOT-25 package measures approximately 2.9 mm × 1.6 mm, with a thermal pad that lowers θJA and enables 300 mA continuous output in compact industrial, USB, and portable-device designs.
The architecture uses a PNP pass element driven by a precision bandgap reference and error amplifier. The wide 3.2 V-to-18 V input range lets the regulator accept 5 V, 9 V, 12 V, and 15 V rails directly without a pre-regulator, simplifying USB-powered, 12 V wall-adapter, and multi-cell battery designs. Reverse-current protection guards against back-feeding when VOUT exceeds VIN during plug-in events.
Typical applications include USB-powered devices, portable instrumentation, microcontroller and MCU-rail supplies, battery-powered IoT nodes, point-of-load regulation after a switching converter, and industrial sensor modules. Always-on rails in metering and remote-monitoring equipment benefit from the part's sub-µA quiescent current.
When designing with the AP7370-33W5-7, place a 1 µF or larger low-ESR ceramic input capacitor close to VIN and a 1 µF ceramic output capacitor close to VOUT. Observe the absolute maximum input voltage of 20 V and derate output current above +85 °C. The EN logic is fixed-on in the -33 variant; if shutdown control is needed, refer to the AP7370-12/15/18/25/28/30 fixed-voltage siblings or pin-compatible ULDO alternatives.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： AP7370-33W5-7 ——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：
AP7370-33W5-7
✅ 直接替换✓ 有现货
$0.18 / 个
查看数据手册 →AP7375-33W5-7
✅ 直接替换📋 参考替代料（不在目录中）
AP7370-33W5-7
✅ 直接替换✓ 有现货
$0.18 / 个
查看数据手册 →AP7370-33W5-7 最大额定值与电气特性
| Manufacturer | Diodes Incorporated |
| Part Number | AP7370-33W5-7 |
| Regulator Type | LDO (Low-Dropout), Positive Fixed |
| Output Voltage (Nominal) | 3.3 V |
| 最大输出电流 | 300 mA |
| 输入电压范围 | 3.2 V to 18 V |
| 静态电流 | Ultra-low (datasheet spec) |
| 限流 | Yes (fold-back) |
| Reverse Current Protection | Yes |
| 输出类型 | Fixed (3.3 V) |
| 输出数量 | 1 |
| 封装 | SOT-25 (5-pin) |
| 安装类型 | Surface Mount |
| 工作温度 | -40 °C to +85 °C (industrial) |
| RoHS 状态 | Compliant |
| MSL 等级 | 1 (per JEDEC J-STD-020) |
AP7370-33W5-7 引脚配置
| 引脚 1 | VIN — Input voltage (3.2 V to 18 V) |
| 引脚 2 | GND — Ground |
| 引脚 3 | EN — Enable input (active high; tied to VIN if not used) |
| 引脚 4 | NC — Not connected (per datasheet) |
| 引脚 5 | VOUT — Regulated 3.3 V output |
典型应用
AP7370-33W5-7 适用于 6 应用s: USB-Powered Devices, Portable / Battery-Powered IoT Nodes, Industrial Sensor Modules, Point-of-Load Regulation After a Switching Converter, Microcontroller and MCU Rail Supply, Handheld Test and Measurement Instruments.
USB-Powered Devices
The AP7370-33W5-7 is ideal for USB-powered peripherals because its 3.2 V to 18 V input range accepts a 5 V USB VBUS rail directly without a pre-regulator, and its 3.3 V fixed output cleanly supplies microcontroller and MCU-IO rails. The 300 mA continuous output covers most MCU + Wi-Fi/BLE radio combinations. Reverse-current protection guards against back-feeding into VBUS during hot-plug events, and the ultra-low quiescent current minimizes standby drain on bus-powered devices that must meet USB suspend current limits.
推荐
Portable / Battery-Powered IoT Nodes
Battery-powered IoT endpoints benefit from the AP7370-33W5-7's ultra-low quiescent current, which minimizes sleep-mode drain when the MCU and radio are idle. The wide 3.2 V-to-18 V input range accepts 2-series to 4-series alkaline, NiMH, or Li-ion cells without a pre-regulator, simplifying the power tree. The 300 mA output covers transmit bursts for BLE/Zigbee/LoRa radios. The SOT-25 footprint keeps the regulator footprint under 5 mm², enabling coin-cell and wearable form factors.
推荐
Industrial Sensor Modules
Industrial sensor modules running off a 12 V or 24 V bus need a regulator that survives wide transients — the AP7370-33W5-7's 18 V absolute-maximum input and 3.2 V minimum startup cover 12 V and 15 V industrial rails directly, while 24 V systems need a TVS pre-clamp or pre-regulator. The fixed 3.3 V output drives precision analog sensors (temperature, pressure, gas) and MCU ADC references with low noise. The SOT-25 package and 300 mA rating fit the small PCBs typical of field-mounted sensor heads.
推荐
Point-of-Load Regulation After a Switching Converter
Placing the AP7370-33W5-7 downstream of a buck or boost converter provides a clean, low-noise 3.3 V post-regulation stage for analog and RF sections. The LDO rejects switching-ripple from the upstream converter, dropping ripple from tens of mV to µV levels at the 3.3 V rail. The 300 mA output handles moderate analog loads (op-amps, ADCs, DACs, transceivers). Combined with a wide-input buck like the AP63205WU-7, this two-stage architecture balances efficiency (in the buck) with low noise (in the LDO).
推荐
Microcontroller and MCU Rail Supply
The AP7370-33W5-7 is a natural fit for the core 3.3 V rail of MCUs in the PIC32, MSP430, ATmega, and other families. With 300 mA of headroom, it covers the MCU plus peripherals (sensors, status LEDs, level shifters) without thermal stress in the SOT-25 package. The ultra-low quiescent current suits sleep-mode MCUs that spend most of their time in deep sleep. The fixed 3.3 V output eliminates the resistor-divider tolerance stack-up that adjustable LDOs introduce.
推荐
Handheld Test and Measurement Instruments
Battery-powered handheld instruments (multimeters, calibrators, dataloggers) need long runtime, low noise, and small PCB area — all strengths of the AP7370-33W5-7. Its ultra-low quiescent current extends battery life between charges; the 3.2 V-to-18 V input range accepts wall-adapter, USB, or 4-cell NiMH packs; the low-noise 3.3 V rail protects the precision ADC and reference inside the instrument. The SOT-25 footprint enables compact handheld enclosures, and the industrial -40 °C to +85 °C temperature range supports field-deployed instruments.
推荐
推荐产品汇总
工程参考数据： AP7370-33W5-7 ——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 | AP7375-33W5-7 | AP7370-30W5-7 | MCP1700-3302E |
|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Microchip Technology |
| Package | SOT-25 (5-pin) | SOT-25 (5-pin) - same | SOT-25 (5-pin) - same | SOT-23 (3-pin) / TO-92 - different |
| Output Voltage | 3.3 V fixed | 3.3 V fixed | 3.0 V fixed - different voltage | 3.3 V fixed |
| Output Current | 300 mA | 300 mA | 300 mA | 250 mA (-17%) |
| Input Voltage Range | 3.2 V to 18 V | Wide input (see AP7375 datasheet) | 3.2 V to 18 V - same | up to 6.0 V max - narrower |
| Quiescent Current | Ultra-low (datasheet spec) | Ultra-low (improved) | Ultra-low - same family | 1.6 µA typical |
| Reverse-Current Protection | Yes | Yes | Yes | No (requires external blocking diode) |
| Recommended for New Designs | No (successor: AP7375) | Yes - Diodes-recommended successor | No (same family) | Yes - mature Microchip part |
| Approx. Unit Price (qty 1) | USD 0.42 (as of 2026-10-06) | USD 0.45 est. | USD 0.42 (same family) | USD 0.40 est. |
关键差异点
- Wide 3.2 V to 18 V input range in SOT-25 （对比 MCP1700-3302E)
- Reverse-current protection built in （对比 MCP1700-3302E)
- 300 mA continuous output in SOT-25 （对比 AP7370-30W5-7 (same family, 3.0 V))
- Cost-effective proven design （对比 AP7375-33W5-7)
设计说明
Place a 1 µF (or larger) low-ESR ceramic input capacitor within 2 mm of the VIN pin and a 1 µF ceramic output capacitor within 2 mm of the VOUT pin. The exposed thermal pad on the bottom of the SOT-25 package is internally connected to GND; solder it to a copper pour of at least 25 mm² to keep θJA low enough for 300 mA continuous operation. Keep the input-trace loop area small to minimize input-voltage ringing at high di/dt loads.
Estimated: At VIN = 5 V, VOUT = 3.3 V, and IOUT = 300 mA, the AP7370-33W5-7 dissipates approximately (5 V - 3.3 V) × 0.3 A = 0.51 W. With SOT-25 θJA around 200 °C/W on a standard 4-layer 1-oz JEDEC test board, the junction temperature rises roughly 100 °C above ambient at full load — derate output current or add copper area if ambient exceeds +70 °C.
Do not exceed the absolute maximum input voltage of 20 V — the AP7370-33W5-7 is rated for 18 V continuous and 20 V transient. When designing for industrial 24 V rails, add a TVS clamp or upstream pre-regulator before the AP7370. Verify the EN pin logic on your specific reel code: some AP7370-W5 variants tie EN internally; confirm the datasheet pin-3 description for the -33 suffix before driving EN from a GPIO.
The AP7370-33W5-7's reverse-current protection blocks back-feeding from VOUT to VIN when VOUT exceeds VIN — useful during plug-in transients or when a backup super-cap holds VOUT above a removed VIN. However, this protection does not replace a power-path OR-ing MOSFET in systems with multiple supply sources; size the input capacitor to handle the inrush when VOUT is pre-biased above VIN at startup.
合规信息
RoHS compliant per Diodes product page and distributor listings (Mouser, DigiKey, Alibaba). Lead-free SOT-25 package. AEC-Q100 not qualified — AP7370 family is industrial/consumer grade. Halogen-free and conflict-mineral status not explicitly stated in the verified web data; consult Diodes' full material declaration for confirmation. Diodes' own AP7370 datasheet recommends the AP7375 family for new designs.
