Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics LM2931D

Name: LM2931D
Brand: STMicroelectronics
SKU: LM2931D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LM2931D

Manufacturer:: STMicroelectronics

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

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LM2931D.pdf

Description:: IC REG LIN POS ADJ 100MA 8SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,909

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LM2931D from STMicroelectronics is a very low-dropout linear voltage regulator in DPAK package, delivering fixed 5 V output at up to 100 mA with 90 mV typical dropout at 10 mA and 2.5 mA typical quiescent current at full load. It features AEC-Q100 qualification, load dump protection to 60 V, reverse transient protection to −50 V, and operates across −40 °C to +125 °C - ideal for automotive body control modules and battery-powered telematics units.

For engineers reviewing the LM2931D datasheet, LM2931D pinout, LM2931D application, or LM2931D equivalent, key selection criteria include dropout voltage under light/heavy load, thermal resistance (R_thJC = 8 °C/W), inhibit logic compatibility with 1.2 V/3.25 V thresholds, and transient survivability during ISO 7637-2 load dump events.

Technical Context

The LM2931D implements a PNP-based LDO architecture with internal current and thermal limiting, enabling stable regulation even when input voltage drops within ~100 mV of the output. Its inhibit function (VINH pin) allows system-level power sequencing by disabling the regulator when VINH exceeds 3.25 V, reducing standby current to ≤1 µA.

Designed for harsh automotive environments, it integrates reverse-battery protection and withstands transient overvoltages up to 60 V (100 ms) and −50 V (100 ms), automatically shutting down to protect downstream circuitry without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 5.0 V ±2.5% over −40 °C to +125 °C and 6–26 V input range
Dropout voltage	90 mV typ. at 10 mA; 250–600 mV max at 100 mA - enables operation with minimal headroom
Quiescent current	2.5 mA typ. at 100 mA load; ≤1 mA in OFF mode - critical for always-on automotive modules
Load dump tolerance	Withstands 60 V transients (≤100 ms) without latch-up or damage - meets ISO 7637-2 Pulse 5a
Inhibit threshold	VIL ≤1.2 V (enable), VIH ≥3.25 V (disable); supports direct MCU GPIO control
Thermal resistance	R_thJC = 8 °C/W (DPAK) - enables >100 mA continuous output with minimal heatsinking
Noise voltage	500 µV_RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog subsystems

Pinout & Package

DPAK package (TO-252-3) with exposed thermal pad; thermally optimized for PCB copper pour mounting.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (VOUT)	Regulated output	Delivers stable 5 V; requires 100 µF output capacitor for stability per datasheet Figure 3
Pin 2 (GND)	Power ground reference	Low-impedance return path; must be connected directly to thermal pad and PCB ground plane
Pin 3 (VIN)	Input supply	Accepts 6–26 V DC; withstands 60 V/−50 V transients when paired with recommended input filtering
Pin 4 (VINH)	Inhibit control input	Active-low enable: regulator ON when VINH < 1.2 V; OFF when VINH > 3.25 V

Key Features

Feature	Design Value
AEC-Q100 qualified	Validated for automotive applications per Grade 1 (−40 °C to +125 °C junction)
Load dump protection	Integrated shutdown during 60 V transients - eliminates need for external TVS/clamp
Reverse polarity survival	Operates safely with −15 V DC and survives −50 V transients - prevents damage from battery misconnection
Inhibit logic interface	CMOS-compatible thresholds (1.2 V/3.25 V) enable direct connection to microcontroller I/O pins
Low-noise regulation	500 µV_RMS output noise supports precision analog sensors and RF front-ends

Applications

Automotive Body Control Module

Telematics Power Management

Use Scenario: Local 5 V supply for door lock actuators, window lift controllers, and interior lighting drivers in 12 V vehicle systems.

IC Role / Device Role / Timing Role: Primary local LDO regulator providing clean, fault-tolerant 5 V rail independent of main ECU supply.

Use Value: Survives load dump and reverse battery events without external protection, reducing BOM count and board space.

Use Scenario: Always-on 5 V supply for GNSS receivers, cellular modems, and CAN transceivers in fleet tracking units.

IC Role / Device Role / Timing Role: Low-quiescent-current regulator enabling <1 mA sleep-mode current while maintaining RTC and wake-on-CAN functionality.

Use Value: 2.5 mA typical I_Q at 100 mA load and sub-1 mA OFF-mode current extend battery backup runtime significantly.

Industrial Sensor Node

Aftermarket Diagnostic Tool

Use Scenario: Powering MEMS accelerometers, temperature sensors, and ADCs in battery-operated condition monitoring devices.

IC Role / Device Role / Timing Role: Ultra-low-noise (500 µV_RMS) 5 V source ensuring high-resolution analog signal integrity.

Use Value: Output noise specification directly supports 16-bit+ data acquisition without additional filtering stages.

Use Scenario: Compact OBD-II diagnostic interface powered from vehicle cigarette lighter socket (9–16 V).

IC Role / Device Role / Timing Role: Robust input-stage regulator handling wide input variation and ignition transients.

Use Value: 60 V transient tolerance and −50 V reverse protection eliminate risk of field failure due to vehicle electrical faults.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV73350PDBVR	Lower I_Q (45 µA typ.), no load dump protection, SOT-23-5 package	Lacks AEC-Q100 rating and transient robustness - unsuitable for under-hood use	Select only for non-automotive, space-constrained, ultra-low-power applications where transients are absent
TPS7B6750QPWPRQ1	AEC-Q100 Grade 1, 45 V max input, 150 mA output, R_thJA = 100 °C/W (SO-PowerPAD)	Higher max input voltage but higher dropout (300 mV @ 100 mA) and larger thermal footprint	Prefer when wider input range (up to 45 V) is required, accepting trade-off in dropout and board area

Compared with TLV73350PDBVR and TPS7B6750QPWPRQ1, the LM2931D uniquely balances AEC-Q100 compliance, 60 V load dump tolerance, and DPAK thermal performance - making it optimal for cost-sensitive, thermally constrained automotive modules requiring proven field reliability.

Availability

LM2931D is available at Aetrix Electronics and suitable for automotive body electronics, telematics power management, and industrial sensor nodes requiring stable component supply with guaranteed automotive-grade traceability and long-term lifecycle support.

Supply support for LM2931D 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, designing and manufacturing silicon solutions for automotive, industrial, and power applications.

The LM2931 series belongs to ST's automotive-qualified linear regulator product line, engineered specifically for robust local power delivery in electrically noisy vehicle subsystems - emphasizing fault tolerance, thermal efficiency, and seamless integration with microcontroller power sequencing.

FAQ

What is the maximum input voltage the LM2931D can handle continuously?

The LM2931D supports a continuous DC input voltage up to 26 V, as specified in its absolute maximum ratings and electrical characteristics tables. Operation beyond this level - even briefly - risks permanent damage unless limited by external circuitry. Its 60 V transient rating applies only to pulses ≤100 ms duration under defined test conditions.

Does the LM2931D require an external capacitor on the inhibit (VINH) pin?

No external capacitor is required on the VINH pin. The inhibit function responds to DC logic levels: regulator enables when VINH < 1.2 V and disables when VINH > 3.25 V. A simple pull-down resistor (e.g., 100 kΩ to GND) ensures default ON state if the controlling MCU pin is high-impedance during reset.

Can the LM2931D be used without the recommended 100 µF output capacitor?

No - the 100 µF output capacitor (with ≤100 mΩ ESR) is mandatory for stability per the application circuit in DS1760 Rev 24 Figure 3. Omitting it or using significantly lower capacitance risks oscillation, especially under dynamic load conditions, as confirmed by stability vs. C_O data in Figure 20.

How does the LM2931D behave during a −50 V reverse polarity transient?

During a −50 V reverse polarity transient (≤100 ms), the LM2931D enters safe shutdown mode and blocks reverse current flow, preventing damage to itself and downstream loads. It resumes normal regulation once input polarity and voltage return within operational limits - verified per AEC-Q100 stress testing and Table 1/3 specifications.

LM2931D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Adjustable

Number of Regulators:: 1

Voltage - Input (Max):: 26V

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: 25.4V

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

Current - Output:: 100mA

Current - Quiescent (Iq):: 1 mA

Current - Supply (Max):: 30 mA

PSRR:: 80dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

LM2931D FAQ

1.How can I place an order for LM2931D through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2931D 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 LM2931D reliable?

The price and inventory of LM2931D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2931D is usually 5 days.

3.What payment methods are accepted for LM2931D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2931D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2931D?

LM2931D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2931D 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 LM2931D?

For technical support, including LM2931D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2931D requirements.

6.How does Aetrix verify that LM2931D is sourced from the original manufacturer or authorized distributors?

All LM2931D 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 LM2931D meets industry standards.

7.What is the process for return or replacement of LM2931D?

All LM2931D units undergo pre-shipment inspection (PSI). If there is an issue with LM2931D, 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 LM2931D part is unused and in its original packaging.

Return procedure for LM2931D:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…