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

Diodes Incorporated AP7381-70SA-7

Name: AP7381-70SA-7
Brand: Diodes Incorporated
SKU: AP7381-70SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7381-70SA-7

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP7381-70SA-7.pdf

Description:: IC REG LIN 7V 150MA SOT23 T&R 3K

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Product details

Overview

AP7381-70SA-7 from Diodes Incorporated is a fixed-output 7.0V ultra-low dropout (ULDO) linear regulator IC designed for high-input-voltage, low-quiescent-current applications. It delivers up to 150mA output current with 1000mV dropout at 100mA, ±2% output voltage accuracy, and operates across a 3.3V–40V input range. Its SOT23-3 package and compatibility with low-ESR ceramic capacitors make it suitable for space-constrained portable power rails in battery-powered instrumentation.

For engineers reviewing the AP7381-70SA-7 datasheet, AP7381-70SA-7 pinout, AP7381-70SA-7 application, or AP7381-70SA-7 equivalent, key selection considerations include its 7.0V fixed output, 2.5µA ground current at zero load, thermal shutdown at +160°C, and support for stable regulation under wide line/load variations in USB-powered and energy-metering systems.

Technical Context

The AP7381-70SA-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 7.0V output, current-limit protection (150mA), chip-enable logic, and thermal shutdown circuitry. Its architecture enables stable regulation without external feedback components.

It achieves ultra-low quiescent current (2.5µA at I_OUT = 0A) while maintaining ±0.5% load regulation and 0.05%/V line regulation over 3.3V–40V input. The device uses internal compensation and requires only 1µF input and 2.2µF output ceramic capacitors for stability.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 7.0V ±2% - ensures precise biasing for 7V analog front-ends or logic interfaces without trimming.
Input Voltage Range	3.3V to 40V - supports direct connection to unregulated 12V/24V industrial rails or multi-cell battery stacks.
Dropout Voltage	1000mV @ 100mA - enables regulation down to VIN = 8.0V, critical for maintaining 7V output under brownout conditions.
Ground Current	2.5µA @ I_OUT = 0A - minimizes standby power loss in always-on metering or sensor nodes.
Thermal Shutdown	+160°C with +20°C hysteresis - provides robust overtemperature recovery without latch-up during transient overload.
PSRR	60dB @ 1kHz - suppresses ripple from noisy DC-DC pre-regulators feeding the ULDO input.
Current Limit	150mA - protects downstream circuitry during short-circuit events while allowing full rated load operation.

Pinout & Package

AP7381-70SA-7 is housed in a RoHS-compliant, lead-free SOT23-3 surface-mount package (2.9mm × 1.3mm × 1.0mm), optimized for automated assembly and thermal performance on standard PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 (VIN)	Input Supply Terminal	Accepts 3.3V–40V unregulated input; requires 1µF ceramic decoupling close to pin for stability.
2 (VOUT)	Regulated Output Terminal	Delivers fixed 7.0V ±2% output; connects to 2.2µF ceramic capacitor and load; no external feedback needed.
3 (GND)	Ground Reference Terminal	Common return path for input/output currents and internal reference; must be low-impedance to minimize noise coupling.

Key Features

Feature	Design Value
Wide Input Range Support	Operates from 3.3V to 40V - eliminates need for pre-regulation in 12V/24V industrial or automotive auxiliary rails.
Ultra-Low Quiescent Current	2.5µA at zero load - extends battery life in portable meters and remote sensors operating in sleep mode.
Ceramic Capacitor Compatibility	Stable with ≥1µF input / ≥2.2µF output X5R/X7R ceramics - reduces board area vs. tantalum and avoids aging-related drift.
Integrated Protection	Thermal shutdown + current limit - prevents damage during sustained overload or ambient temperature excursions.
High Accuracy Regulation	±2% V_OUT tolerance over -40°C to +125°C - ensures reliable ADC reference or microcontroller VDD compliance.

Applications

Smart Energy Meters

Portable Diagnostic Tools

Use Scenario: Powering metrology ICs and isolated communication interfaces in DIN-rail-mounted electricity meters.

IC Role / Device Role / Timing Role: Primary 7V bias rail generator for sigma-delta ADCs and RS-485 transceivers.

Use Value: Maintains 7.0V output accuracy despite wide input variation from rectified AC mains (12–36V), ensuring consistent ADC gain calibration.

Use Scenario: Supplying analog front-end circuits in handheld multimeters and insulation testers.

IC Role / Device Role / Timing Role: Low-noise, low-quiescent LDO for op-amp signal conditioning stages.

Use Value: 60dB PSRR rejects switching noise from onboard DC-DC converters, preserving measurement resolution below 100µV.

Laptop Docking Stations

Industrial IoT Sensors

Use Scenario: Providing regulated 7V supply to USB-C PD controller auxiliary rails and display interface logic.

IC Role / Device Role / Timing Role: Secondary LDO for non-USB power domains requiring tighter voltage control than main buck outputs.

Use Value: 1000mV dropout allows operation from 8V intermediate bus, enabling efficient two-stage conversion without headroom loss.

Use Scenario: Powering low-power wireless transceivers and MEMS sensors in battery-operated condition monitoring nodes.

IC Role / Device Role / Timing Role: Standby-mode regulator maintaining real-time clock and wake-up circuitry.

Use Value: 2.5µA ground current extends 10-year battery life in sealed environmental sensors deployed in remote infrastructure.

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-7002E/MB	7.0V output, 250mA rating, 600mV dropout @ 250mA, 3.5µA IQ	Higher current capacity but larger SOT89-3 package; less suitable for ultra-compact layouts	Select when >150mA load or lower dropout at full load is required; verify thermal derating in confined spaces.
TPS7A2070PDBVR	7.0V output, 300mA rating, 1.1V dropout @ 300mA, 6.5µA IQ, enable pin	Includes active-high enable and higher PSRR (70dB), but higher quiescent current and cost	Choose for systems needing programmable power sequencing or stricter ripple rejection; not optimal for ultra-low-IQ designs.

Compared with MCP1703T-7002E/MB and TPS7A2070PDBVR, the AP7381-70SA-7 offers the lowest ground current (2.5µA) in the smallest footprint (SOT23), making it optimal for size- and battery-life-critical 7V rail generation where 150mA suffices.

Availability

AP7381-70SA-7 is available at Aetrix Electronics and suitable for smart metering, portable instrumentation, docking station power management, and industrial IoT sensor nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP7381-70SA-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and communications markets.

The AP7381 series belongs to Diodes' high-voltage ULDO regulator product line, engineered specifically for reliable, low-power regulation in battery-backed and wide-input industrial power systems.

FAQ

What is the minimum input voltage required for AP7381-70SA-7 to regulate 7.0V output?

The AP7381-70SA-7 requires a minimum input voltage of 3.3V per datasheet Recommended Operating Conditions, but to maintain regulation at full 150mA load, VIN must exceed VOUT + VDROP = 7.0V + 1.0V = 8.0V. At light loads (<1mA), regulation is maintained down to VIN ≈ 7.14V due to reduced dropout.

Can AP7381-70SA-7 be used with aluminum polymer capacitors instead of ceramic?

No - the AP7381-70SA-7 is explicitly characterized and stabilized for use with low-ESR ceramic capacitors (≥1µF input, ≥2.2µF output). Aluminum polymer capacitors exhibit higher ESR and phase shift that may cause instability or oscillation; ceramic remains mandatory for guaranteed performance.

Does AP7381-70SA-7 include reverse-polarity protection?

No - the AP7381-70SA-7 lacks integrated reverse-voltage protection. Applying reversed polarity to VIN or VOUT can cause permanent damage. External protection (e.g., series Schottky diode on VIN or back-to-back MOSFET circuit) must be added if reverse input is possible in the system.

Is AP7381-70SA-7 qualified for automotive applications per AEC-Q100?

No - the AP7381-70SA-7 is not AEC-Q100 qualified. Diodes states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing; this SOT23 variant is intended for industrial and commercial applications only.

AP7381-70SA-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):: 40V

Voltage - Output (Min/Fixed):: 7V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 150mA

Current - Quiescent (Iq):: -

Current - Supply (Max):: 25 µA

PSRR:: -

Control Features:: -

Protection Features:: Current Limit, Short Circuit, Thermal Shutdown

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

AP7381-70SA-7 FAQ

1.How can I place an order for AP7381-70SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7381-70SA-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 AP7381-70SA-7 reliable?

The price and inventory of AP7381-70SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7381-70SA-7 is usually 5 days.

3.What payment methods are accepted for AP7381-70SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7381-70SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7381-70SA-7?

AP7381-70SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7381-70SA-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 AP7381-70SA-7?

For technical support, including AP7381-70SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7381-70SA-7 requirements.

6.How does Aetrix verify that AP7381-70SA-7 is sourced from the original manufacturer or authorized distributors?

All AP7381-70SA-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 AP7381-70SA-7 meets industry standards.

7.What is the process for return or replacement of AP7381-70SA-7?

All AP7381-70SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7381-70SA-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 AP7381-70SA-7 part is unused and in its original packaging.

Return procedure for AP7381-70SA-7:

1.Submit a request within 90 days.

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

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