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Diodes Incorporated AP7381-50V-A
- Part No.:
- AP7381-50V-A
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AP7381-50V-A.pdf
- Description:
- IC REG LINEAR 5V 150MA TO92
- Quantity:
- Payment:
- Shipping:
Inventory:9,560
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Product details
Overview
AP7381-50V-A from Diodes Incorporated is a fixed-output 5.0V ultra-low dropout (ULDO) linear regulator IC designed for high-input-voltage portable and battery-powered systems. It delivers up to 150mA output current with 1000mV dropout at 100mA, ±2% output voltage accuracy, and only 2.5µA ground current at zero load - enabling long runtime in USB-powered meters and handheld devices.
For engineers reviewing the AP7381-50V-A datasheet, AP7381-50V-A pinout, AP7381-50V-A application, or AP7381-50V-A equivalent, key selection criteria include wide 3.3–40V input range, thermal shutdown and short-circuit protection, compatibility with low-ESR ceramic capacitors, and TO92 (Ammo Packing) package suitability for cost-sensitive, low-density PCB layouts.
Technical Context
The AP7381-50V-A integrates a precision voltage reference, error amplifier, resistor network for fixed 5.0V output, current-limit circuitry, and chip-enable logic - all operating within a single monolithic silicon die. Its architecture supports stable regulation across -40°C to +125°C junction temperature with no external feedback components required.
It features active thermal shutdown triggered at +160°C with +20°C hysteresis, and delivers 60dB PSRR at 1kHz while maintaining <0.5% load regulation from 1mA to 150mA. Line regulation is specified at 0.05%/V over full input range, confirming robust immunity to supply rail variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% - eliminates need for external resistor divider and ensures consistent system rail compliance. |
| Input Voltage Range | 3.3V to 40V - supports direct connection to unregulated 12V/24V industrial rails or multi-cell battery stacks without pre-regulation. |
| Dropout Voltage | 1000mV @ 100mA - enables regulation down to VIN = 6.0V, critical for maintaining 5V output during battery discharge. |
| Ground Current | 2.5µA @ IOUT = 0mA - minimizes standby power loss in always-on metering and sensor nodes. |
| Thermal Shutdown | Activates at +160°C with +20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| PSRR | 60dB @ 1kHz - suppresses ripple from noisy switch-mode supplies feeding the LDO input. |
| Load Regulation | ±0.5% from 1mA to 150mA - ensures stable microcontroller core voltage despite dynamic current bursts. |
Pinout & Package
AP7381-50V-A is housed in TO92 (Ammo Packing), a through-hole, three-terminal plastic package measuring 4.3–4.7mm width × 12.5–14.5mm length × 3.3–3.8mm height, with matte tin-plated leads compliant to MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TO92) | VIN | Main input supply connection; accepts up to 40V DC and must be decoupled with ≥1µF ceramic capacitor. |
| 2 (TO92) | GND | Power ground reference for internal error amplifier and current limit circuit; requires low-impedance PCB return path. |
| 3 (TO92) | VOUT | Regulated 5.0V output; requires ≥2.2µF low-ESR ceramic capacitor for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | Supports 3.3–40V operation - enables single-LDO solution across diverse input sources including automotive battery, industrial 24V, and multi-cell Li-ion packs. |
| Ultra-low quiescent current | 2.5µA ground current at zero load - extends battery life in e-meter sleep modes and IoT endpoint wake-on-event designs. |
| Ceramic capacitor compatible | Stable with ≥2.2µF X5R/X7R ceramic output cap - reduces board area and eliminates electrolytic capacitor aging and leakage concerns. |
| Integrated protection | Thermal shutdown + short-circuit current limit - removes need for external foldback or thermal sensors in space-constrained applications. |
| High accuracy output | ±2% VOUT tolerance over full temperature and load range - ensures reliable operation of 5V-tolerant MCUs, ADCs, and interface ICs without post-regulation trimming. |
Applications
| Smart Electricity Meter | Portable Medical Sensor |
|---|---|
|
Use Scenario: Powering metrology ASIC, RTC, and RF transceiver in Class 0.2 smart meter with 3.6V Li-SOCl₂ primary battery and 24V AC line backup. IC Role / Device Role / Timing Role: Primary 5V LDO supplying isolated analog front-end and secure bootloader circuitry; maintains regulation during battery sag and line transients. Use Value: 1000mV dropout allows >3000h runtime on primary cell; ±2% accuracy guarantees ADC reference stability for revenue-grade energy measurement. |
Use Scenario: Regulating 5V rail for Bluetooth LE module and analog biosensor signal chain in handheld pulse oximeter with dual AA alkaline cells. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-power voltage source for precision op-amps and SAR ADC; enables 7-day continuous monitoring on single battery set. Use Value: 2.5µA ground current extends standby time; 60dB PSRR rejects switching noise from BLE radio, preserving SNR in photodiode amplification stage. |
| Industrial Handheld Scanner | USB-Powered Test Fixture |
|
Use Scenario: Providing clean 5V to CMOS image sensor, laser driver, and ARM Cortex-M4 MCU in ruggedized barcode scanner powered by 7.4V Li-Poly pack. IC Role / Device Role / Timing Role: Post-regulator after buck converter; filters high-frequency ripple and sustains 5V during motor-triggered current surges up to 150mA. Use Value: 0.5% load regulation prevents MCU brown-out during simultaneous imaging and motor actuation; TO92 footprint simplifies manual rework in field-service units. |
Use Scenario: Generating stable 5V from USB 2.0 host port (4.75–5.25V) for calibration DAC, reference buffer, and FPGA configuration logic in benchtop test adapter. IC Role / Device Role / Timing Role: Precision local regulator isolating sensitive analog circuitry from USB bus noise and shared ground bounce. Use Value: 0.05%/V line regulation rejects USB cable drop-induced variations; ±100ppm/°C tempco ensures <1 LSB drift in 16-bit DAC reference over 0–50°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-5002E/MB | 5.0V output, 250mA rating, 600mV dropout @ 250mA, SOT23-5 package with enable pin. | Requires external enable control and higher minimum input voltage (6.0V) due to lower dropout - unsuitable for sub-6V battery operation. | Select when higher output current and active enable functionality are needed; not drop-in for TO92-limited boards. |
| SPX3819M5-L-5-0 | 5.0V output, 500mA rating, 340mV dropout @ 500mA, SOT23-5 package, 12µA quiescent current. | Higher IQ and different pinout (VIN-GND-VOUT-EN-GND) - incompatible with TO92 footprint and increases standby power 5× vs. AP7381-50V-A. | Choose for high-current, low-dropout needs where PCB redesign and increased quiescent draw are acceptable. |
Compared with MCP1703T-5002E/MB and SPX3819M5-L-5-0, the AP7381-50V-A uniquely balances ultra-low IQ (2.5µA), TO92 through-hole compatibility, and 40V input capability - making it optimal for cost-sensitive, battery-backed metering where board real estate and standby power are constrained.
Availability
AP7381-50V-A is available at Aetrix Electronics and suitable for smart electricity meters, portable medical sensors, and industrial handheld scanners requiring stable component supply with long-term manufacturability and RoHS-compliant sourcing.
Supply support for AP7381-50V-A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP7381 series belongs to Diodes' ULDO regulator product line, engineered specifically for battery-powered and wide-input industrial applications where low quiescent current, high input voltage tolerance, and robust protection are mandatory design requirements.
FAQ
What is the maximum input voltage rating for AP7381-50V-A?
The absolute maximum input voltage is 45V, but the recommended operating range is 3.3V to 40V. Operation above 40V risks exceeding thermal limits under load, especially in TO92's 165°C/W θJA package. For sustained 40V input, ensure ambient temperature remains ≤+65°C and use adequate copper pour for heat dissipation.
Can AP7381-50V-A operate with a 2.2µF ceramic output capacitor only?
Yes - the device is explicitly characterized and stabilized with a 2.2µF X5R/X7R ceramic capacitor (COUT), and does not require ESR damping. Using smaller values (<1.5µF) may cause instability or excessive output overshoot during load transients; larger values improve ripple rejection but do not affect regulation accuracy.
Is AP7381-50V-A qualified for automotive applications?
No - AP7381-50V-A is not AEC-Q100 qualified and is not manufactured in an IATF 16949-certified facility per Diodes' documentation. It is intended for industrial, commercial, and consumer applications. For automotive use, Diodes recommends contacting their sales team for AEC-Q100-qualified alternatives such as the AP7361Q series.
Does AP7381-50V-A include reverse-polarity protection?
No - the device lacks integrated reverse-voltage protection. Applying reversed input polarity will forward-bias internal substrate diodes and may cause irreversible damage. External protection, such as a series Schottky diode or MOSFET-based ideal diode circuit, must be added if reverse input is possible in the target application.
AP7381-50V-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 100mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 2.5 µA
- Current - Supply (Max):
- 25 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Current Limit, Thermal Shutdown
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
AP7381-50V-A FAQ
1.How can I place an order for AP7381-50V-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7381-50V-A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AP7381-50V-A reliable?
The price and inventory of AP7381-50V-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7381-50V-A is usually 5 days.
3.What payment methods are accepted for AP7381-50V-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7381-50V-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7381-50V-A?
AP7381-50V-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7381-50V-A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AP7381-50V-A?
For technical support, including AP7381-50V-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7381-50V-A requirements.
6.How does Aetrix verify that AP7381-50V-A is sourced from the original manufacturer or authorized distributors?
All AP7381-50V-A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP7381-50V-A meets industry standards.
7.What is the process for return or replacement of AP7381-50V-A?
All AP7381-50V-A units undergo pre-shipment inspection (PSI). If there is an issue with AP7381-50V-A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AP7381-50V-A part is unused and in its original packaging.
Return procedure for AP7381-50V-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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