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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP7387-50SA-7

Name: AP7387-50SA-7
Brand: Diodes Incorporated
SKU: AP7387-50SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7387-50SA-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: AP7387-50SA-7.pdf

Description:: LDO CMOS LOWCURR SOT23 T&R 3K

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Inventory:4,251

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Product details

Overview

AP7387-50SA-7 from Diodes Incorporated is a 5.0V fixed-output, wide-input (5–60V), 150mA ultra-low-dropout linear regulator in SOT23 package. It delivers ±2% output voltage accuracy, 700mV dropout at 100mA, and 2μA quiescent current-enabling long-life operation in battery-powered smoke detectors and EV battery management systems.

For engineers reviewing the AP7387-50SA-7 datasheet, AP7387-50SA-7 pinout, AP7387-50SA-7 application, or AP7387-50SA-7 equivalent, key selection criteria include input voltage range up to 60V, thermal shutdown at +150°C, PSRR of 70dB @ 1kHz, and compatibility with 1μF input / 10μF ceramic output capacitors.

Technical Context

The AP7387-50SA-7 integrates a precision voltage reference, error amplifier, and current-limit circuit for overcurrent protection, plus thermal shutdown and short-circuit protection. Its architecture enables fast line/load transient response without external compensation.

It operates across –40°C to +85°C ambient temperature with internal junction temperature limit of +125°C continuous and +150°C shutdown threshold. The SOT23 package provides θ_JA = 248.5°C/W and requires minimum 1μF input and 10μF output ceramic capacitance for stability.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	5V to 60V - supports direct connection to 12V/24V/48V industrial and automotive rails without pre-regulation
Output Voltage	5.0V ±2% - tight regulation ensures reliable MCU core or sensor interface supply under load and temperature variation
Max Output Current	150mA - sufficient for low-power microcontrollers, sensors, and logic circuits in space-constrained designs
Dropout Voltage	700mV @ 100mA (typ.) - enables stable 5V output even when input drops to 5.7V, critical for brown-out resilience
Quiescent Current	2μA (typ.) - extends battery life in always-on smoke detectors and remote sensors by minimizing standby loss
PSRR	70dB @ 1kHz - suppresses ripple from noisy DC-DC converters or battery transients before sensitive analog loads
Thermal Shutdown	+150°C with +30°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design

Pinout & Package

SOT23-3 package: compact 2.9mm × 1.3mm surface-mount outline with exposed pad not present; requires minimal PCB area and supports reflow soldering per J-STD-020 Level 1.

Pin	Circuit Role	Design Meaning
1	VIN	Main input supply pin - connect 1μF ceramic capacitor directly adjacent to minimize high-frequency noise coupling
2	GND	Analog/digital ground reference - tie to low-impedance PCB ground plane to ensure regulation accuracy and thermal dissipation
3	VOUT	Regulated 5.0V output - place 10μF X7R/X5R ceramic capacitor within 2mm to maintain loop stability and transient response

Key Features

Feature	Design Value
Wide Input Range (5–60V)	Eliminates need for external step-down stage in 24V/48V industrial sensors and EV auxiliary power domains
Ultra-Low I_Q (2μA)	Reduces annual standby power draw to <1.8mWh - critical for 10-year battery life in wireless smoke alarms
High PSRR (70dB @ 1kHz)	Attenuates switching noise from upstream DC-DC converters, preserving ADC reference integrity in sensor nodes
Fast Transient Response	Stabilizes output within 2ms after 10–100mA load step - maintains MCU clock stability during burst-mode operation
Integrated Protections	Current limit (~250mA), thermal shutdown (+150°C), and short-circuit protection reduce external component count and BOM cost

Applications

Smoke Detector Power Supply

EV Battery Monitoring Node

Use Scenario: Primary regulated supply for electrochemical CO sensor and low-power MCU in residential smoke alarms.

IC Role / Device Role / Timing Role: Ultra-low-I_Q LDO delivering stable 5V rail from 9V alkaline battery stack.

Use Value: 2μA quiescent current enables >10-year shelf life without battery replacement; ±2% accuracy ensures consistent sensor biasing.

Use Scenario: Local 5V supply for cell-voltage monitoring ICs and isolated CAN transceivers in EV battery packs.

IC Role / Device Role / Timing Role: Wide-input LDO accepting variable pack voltage (12–60V) while rejecting ripple from high-current DC-DC stages.

Use Value: 60V max input eliminates need for pre-regulator; 70dB PSRR prevents noise coupling into precision ADC references.

Microcontroller Core Supply

Home Appliance Control Board

Use Scenario: Dedicated 5V rail for ARM Cortex-M0+ MCU and peripheral I/O in portable medical devices.

IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO ensuring clean power during wake-from-sleep transitions.

Use Value: 2ms load-step recovery time prevents MCU brown-out resets; 700mV dropout allows operation down to 5.7V input.

Use Scenario: Main 5V supply for display driver, touch controller, and Wi-Fi module in smart refrigerator control boards.

IC Role / Device Role / Timing Role: Robust LDO handling wide-line variations (12–24V AC-DC adapter output) and motor-induced transients.

Use Value: Thermal shutdown and current limit protect against inrush during display backlight activation; RoHS/Green compliance meets global appliance regulations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-quiescent-current LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7361-50SA-7	Lower max input (40V vs. 60V); same 5V output, 150mA, 2μA I_Q, SOT23 package	Not suitable for 48V battery systems or industrial 60V rails	Select only if input never exceeds 40V; otherwise AP7387-50SA-7 provides wider margin and identical footprint
MCP1703T-5002E/MB	Higher I_Q (3.5μA), lower PSRR (60dB @ 1kHz), same 5V/150mA, SOT23-3	Limited battery life in multi-year deployments; reduced noise rejection in mixed-signal environments	Acceptable for cost-sensitive consumer appliances but inferior for safety-critical or long-life battery systems

Compared with AP7361-50SA-7 and MCP1703T-5002E/MB, the AP7387-50SA-7 uniquely combines 60V input tolerance, 2μA I_Q, and 70dB PSRR in SOT23-making it the only option qualified for 48V EV auxiliary power and decade-life smoke detectors without trade-offs.

Availability

AP7387-50SA-7 is available at Aetrix Electronics and suitable for battery-powered equipment, smoke detectors and sensors, and EV/HEV battery management systems requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for AP7387-50SA-7 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the U.S., serving industrial, automotive, and consumer markets.

The AP7387 belongs to Diodes' ultra-low-I_Q LDO product line, engineered specifically for energy-constrained, wide-input applications including battery-backed safety systems and electric vehicle subsystems.

FAQ

What is the minimum input voltage required for AP7387-50SA-7 to regulate 5.0V output?

The AP7387-50SA-7 requires VIN ≥ VOUT + VDROP. With typical dropout of 700mV at 100mA and 1100mV at 150mA, minimum input is 5.7V at light load and 6.1V at full 150mA load. Absolute minimum specified operating VIN is 5.0V, but regulation cannot be guaranteed below VOUT + VDROP.

Can AP7387-50SA-7 be used with tantalum output capacitors?

No-tantalum capacitors are not recommended. The AP7387-50SA-7 requires ceramic output capacitors (X7R or X5R dielectric) with minimum 10μF capacitance for stability. Tantalum capacitors exhibit higher ESR and risk oscillation or thermal runaway under transient conditions.

Does AP7387-50SA-7 require an input capacitor, and what value is recommended?

Yes-an input capacitor is mandatory. A 1μF X7R/X5R ceramic capacitor must be placed between VIN and GND, located as close as possible to the device pins. Larger values improve noise immunity but are not required for basic stability; no upper limit is specified.

Is AP7387-50SA-7 qualified for automotive applications?

No-the AP7387-50SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Diodes offers the AP7387Q variant, which is documented separately and meets AEC-Q100 Grade 1 requirements (–40°C to +125°C).

AP7387-50SA-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 60V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.35V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 4 µA

Current - Supply (Max):: -

PSRR:: 70dB (1kHz)

Control Features:: Current Limit

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

AP7387-50SA-7 FAQ

1.How can I place an order for AP7387-50SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7387-50SA-7 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 AP7387-50SA-7 reliable?

The price and inventory of AP7387-50SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7387-50SA-7 is usually 5 days.

3.What payment methods are accepted for AP7387-50SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7387-50SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7387-50SA-7?

AP7387-50SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7387-50SA-7 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 AP7387-50SA-7?

For technical support, including AP7387-50SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7387-50SA-7 requirements.

6.How does Aetrix verify that AP7387-50SA-7 is sourced from the original manufacturer or authorized distributors?

All AP7387-50SA-7 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 AP7387-50SA-7 meets industry standards.

7.What is the process for return or replacement of AP7387-50SA-7?

All AP7387-50SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7387-50SA-7, 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 AP7387-50SA-7 part is unused and in its original packaging.

Return procedure for AP7387-50SA-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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