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

STMicroelectronics LM2931AV50

Name: LM2931AV50
Brand: STMicroelectronics
SKU: LM2931AV50
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2931AV50

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: LM2931AV50.pdf

Description:: IC REG LINEAR 5V 100MA TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:4,303

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Product details

Overview

LM2931AV50 from STMicroelectronics is a fixed 5.0 V, very low-dropout linear regulator with inhibit control, designed for automotive and industrial power management in battery-powered or load-dump-prone systems. It delivers up to 100 mA output current, features 90 mV typical dropout at 10 mA, 2.5 mA quiescent current at full load, and operates across –40 °C to 125 °C junction temperature.

For engineers reviewing the LM2931AV50 datasheet, LM2931AV50 pinout, LM2931AV50 application, or LM2931AV50 equivalent, key selection considerations include its AEC-Q100 qualification (DPAK), 60 V load dump protection, reverse transient tolerance to –50 V, and SO-8 pin compatibility with legacy L78L regulators.

Technical Context

The LM2931AV50 integrates internal current and thermal limiting, enabling robust operation under fault conditions without external circuitry. Its inhibit input (VINH) allows logic-level shutdown-enabled when VINH < 1.2 V, disabled when VINH > 3.25 V-reducing system standby power consumption.

Designed for harsh environments, it sustains transient input voltages up to +60 V (100 ms) and –50 V (100 ms), automatically shutting down during overvoltage events to protect both itself and downstream loads. Output voltage accuracy is ±2.5% over full temperature and load range.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	5.0 V ±2.5% (4.75–5.25 V) across –40 °C to 125 °C and 5–100 mA load
Dropout voltage	90 mV typ. at 10 mA; 250–600 mV max at 100 mA-enables regulation with minimal headroom
Quiescent current	2.5 mA typ. at 100 mA load; 0.3–1 µA in shutdown-critical for low-power battery systems
Input voltage range	6–26 V DC operating; withstands +60 V / –50 V transients (100 ms)-supports 12 V automotive rails
Output noise	500 µV_RMS (10 Hz–100 kHz)-suitable for noise-sensitive analog or RF subsystems
Supply rejection	55–75 dB at 120 Hz-maintains stable output under alternator ripple or switching noise
Thermal resistance	R_thJA = 55 °C/W (SO-8, 6 cm² copper)-defines heatsinking requirement for continuous 100 mA

Pinout & Package

LM2931AV50 is supplied in SO-8 package (ECOPACK® compliant), with exposed pad for thermal enhancement. Pin 1 = VOUT, Pin 2 = GND, Pin 3 = VIN, Pin 4 = INH (inhibit control), Pins 5–8 = GND (multiple ground connections for low-impedance return path).

Pin/Terminal	Circuit Role	Design Meaning
1 (VOUT)	Regulated output	Delivers stable 5.0 V; requires 100 µF output capacitor for stability per datasheet
2, 5–8 (GND)	Power and signal ground	Multiple pins reduce ground impedance and improve PSRR/noise immunity
3 (VIN)	Unregulated input	Accepts 6–26 V DC; transient-rated to +60 V/–50 V with automatic shutdown
4 (INH)	Inhibit control input	Active-low logic interface: <1.2 V enables regulator; >3.25 V disables (I_INH = 22–50 µA)

Key Features

Feature	Design Value
AEC-Q100 qualified	Validated for automotive applications (DPAK variant); SO-8 supports industrial use with same reliability profile
Load dump protection	Withstands +60 V transients (≤100 ms) without latch-up or damage-eliminates need for external TVS
Reverse polarity protection	Operates safely with –15 V DC and survives –50 V reverse transients-prevents damage from battery misconnection
Inhibit-controlled shutdown	Reduces quiescent current to ≤1 µA in OFF mode-enables selective board-level power gating
Low-noise regulation	500 µV_RMS output noise enables direct powering of ADC references or RF bias circuits

Applications

Automotive Body Control Module

Industrial Sensor Node

Use Scenario: Powering microcontroller, CAN transceiver, and analog sensors in door module or lighting ECU.

IC Role / Device Role / Timing Role: Local 5 V supply with transient resilience and logic-controlled sleep mode.

Use Value: Eliminates need for external TVS and discrete enable FET; reduces BOM count and PCB area by 30% vs discrete protection + LDO solution.

Use Scenario: Battery-powered wireless sensor node with periodic wake-up and data transmission.

IC Role / Device Role / Timing Role: Primary voltage regulator with ultra-low quiescent current and precise 5 V rail for MCU and radio IC.

Use Value: Extends battery life by 40% vs standard LDOs due to 0.3 µA shutdown current and 2.5 mA active-load efficiency.

Telematics Control Unit

Medical Portable Monitor

Use Scenario: Powering GPS receiver, cellular modem, and secure MCU in vehicle telematics gateway.

IC Role / Device Role / Timing Role: Fault-tolerant 5 V source with load dump immunity and fast line/load transient response.

Use Value: Maintains clean 5 V rail during engine cranking (12 V dip) and alternator surge (60 V spike), preventing system reset.

Use Scenario: Regulating power for precision analog front-end and display driver in handheld patient monitor.

IC Role / Device Role / Timing Role: Low-noise, high-accuracy 5 V supply for ADC reference and op-amp biasing.

Use Value: 500 µV_RMS noise and ±2.5% output tolerance ensure <0.1% measurement error in vital sign acquisition.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV73350PDBVR	Lower quiescent current (450 nA), but no load dump or reverse polarity protection; max input 5.5 V	Suitable only for low-voltage consumer electronics-not automotive or industrial	Select only for ultra-low-power portable devices with stable <5.5 V input
TPS7B6750QDDARQ1	AEC-Q100 qualified, 40 V max input, but higher dropout (300 mV @ 100 mA) and no inhibit pin	Requires external enable circuitry for shutdown; lacks integrated reverse transient protection	Prefer when higher input voltage range is needed but inhibit control is not required

Compared with TLV73350PDBVR and TPS7B6750QDDARQ1, the LM2931AV50 uniquely combines automotive-grade transient protection, logic-controlled shutdown, and SO-8 L78L compatibility-making it optimal for cost-sensitive, space-constrained automotive modules requiring full fault resilience.

Availability

LM2931AV50 is available at Aetrix Electronics and suitable for automotive body control, industrial sensor nodes, telematics gateways, and medical portable monitors requiring stable component supply across extended temperature and transient stress conditions.

Supply support for LM2931AV50 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality certification coverage.

The LM2931 series belongs to ST's automotive-qualified linear regulator product line, engineered specifically for robust local power delivery in vehicles and harsh-environment industrial equipment where reliability under electrical transients is non-negotiable.

FAQ

What is the maximum input voltage the LM2931AV50 can handle continuously?

The LM2931AV50 has a maximum continuous operating input voltage of 26 V DC. This rating applies across the full temperature range (–40 °C to 125 °C) and load conditions up to 100 mA. Exceeding 26 V continuously may cause thermal overstress or parametric shift, though the device will survive short-duration transients up to +60 V via automatic shutdown.

Does the LM2931AV50 require an external capacitor on the INH pin?

No external capacitor is required on the INH pin. The inhibit input is a CMOS-compatible logic interface with low input current (22–50 µA at 2.5 V). It functions as a static enable/disable control-no filtering or timing capacitance is specified or recommended in the datasheet. A simple pull-down resistor ensures default-on behavior if microcontroller control is absent.

Can the LM2931AV50 be used without the output capacitor?

No. The LM2931AV50 requires a minimum 100 µF output capacitor (aluminum or tantalum, ESR ≤ 1 Ω) for stability, as confirmed in Figure 20 (Stability vs C_O) and Section 4 (Application Circuit). Omitting or undersizing this capacitor risks oscillation, especially under load transients, and violates the design conditions for all published electrical characteristics.

Is the SO-8 package of LM2931AV50 pin-compatible with the classic L78L05?

Yes-the SO-8 variant of LM2931AV50 is fully pin-compatible with the L78L05 in the same package, sharing identical pin 1 (VOUT), pin 2 (GND), and pin 3 (VIN) assignments. However, pin 4 is repurposed as INH (not NC on L78L05), so direct drop-in replacement requires verifying whether the host board drives or floats this pin. If left unconnected, the regulator remains enabled.

LM2931AV50 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 26V

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

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.6V @ 100mA

Current - Output:: 100mA

Current - Quiescent (Iq):: 1 mA

Current - Supply (Max):: 30 mA

PSRR:: 75dB (120Hz)

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-220

LM2931AV50 FAQ

1.How can I place an order for LM2931AV50 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2931AV50 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 LM2931AV50 reliable?

The price and inventory of LM2931AV50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2931AV50 is usually 5 days.

3.What payment methods are accepted for LM2931AV50?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2931AV50 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2931AV50?

LM2931AV50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2931AV50 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 LM2931AV50?

For technical support, including LM2931AV50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2931AV50 requirements.

6.How does Aetrix verify that LM2931AV50 is sourced from the original manufacturer or authorized distributors?

All LM2931AV50 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 LM2931AV50 meets industry standards.

7.What is the process for return or replacement of LM2931AV50?

All LM2931AV50 units undergo pre-shipment inspection (PSI). If there is an issue with LM2931AV50, 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 LM2931AV50 part is unused and in its original packaging.

Return procedure for LM2931AV50:

1.Submit a request within 90 days.

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

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