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 LM2931AZ50AP

Name: LM2931AZ50AP
Brand: STMicroelectronics
SKU: LM2931AZ50AP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LM2931AZ50AP

Manufacturer:: STMicroelectronics

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

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: LM2931AZ50AP.pdf

Description:: IC REG LINEAR 5V 100MA TO92-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,250

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

Product details

Overview

LM2931AZ50AP from STMicroelectronics is a fixed 5.0 V, 100 mA low-dropout linear regulator in TO-92 package, featuring 90 mV typical dropout at 10 mA, 2.5 mA quiescent current at 100 mA load, and AEC-Q100 qualification (DPAK variant only). It delivers automotive-grade transient protection (±50 V reverse, 60 V load dump), operates from –40 °C to 125 °C, and is used as a local power supply for microcontrollers and sensors in battery-powered vehicle ECUs.

For engineers reviewing the LM2931AZ50AP datasheet, LM2931AZ50AP pinout, LM2931AZ50AP application, or LM2931AZ50AP equivalent, key selection criteria include dropout voltage under light/heavy load, thermal resistance in TO-92 (R_thJA = 200 °C/W), inhibit control absence in this variant, and compatibility with 100 µF output capacitance for stability per Figure 20.

Technical Context

The LM2931AZ50AP implements a PNP-based LDO architecture with internal current and thermal limiting, enabling stable regulation even during automotive transients. Its 60 V transient input tolerance (t < 100 ms) and –50 V reverse polarity protection are enforced via automatic shutdown-no external circuitry required.

Unlike SO-8 variants, this TO-92 version lacks an inhibit pin; regulation is always active. Output voltage accuracy is ±3% over temperature (–40 to 125 °C) and load (5–100 mA), with 500 µV_RMS noise (10 Hz–100 kHz) suitable for analog sensor rails.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±3% (4.75–5.25 V) across –40 to 125 °C and 5–100 mA load - ensures reliable MCU core/sensor biasing without recalibration.
Dropout Voltage	90 mV typ. at 10 mA; 250–600 mV max at 100 mA - enables operation down to 5.25 V input, critical for cold-crank 6–8 V battery scenarios.
Quiescent Current	2.5 mA typ. at 100 mA load; ≤1 mA in shutdown (not applicable here) - minimizes standby drain in always-on vehicle modules.
Input Transient Tolerance	+60 V / –50 V for <100 ms - survives ISO 7637-2 Pulse 5a (load dump) and reverse-battery events without external TVS.
Thermal Resistance	R_thJA = 200 °C/W (TO-92, no heatsink) - limits max junction temp to ~125 °C at 100 mA with 25 °C ambient, requiring board-level copper area for sustained full-load operation.
Noise Performance	500 µV_RMS (10 Hz–100 kHz) - low enough for precision ADC reference supplies and analog front-ends in telematics units.
Line Regulation	4–30 mV over VI = 6–26 V - maintains tight output despite alternator ripple and battery voltage swings.

Pinout & Package

LM2931AZ50AP uses TO-92 package (mechanical data per DS1760 Table 8): 3-pin through-hole device with 4.32–4.95 mm body height, 12.70–15.49 mm lead length, and 2.41–2.67 mm lead pitch. Pin 1 = VOUT, Pin 2 = GND, Pin 3 = VIN (bottom view).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (VOUT)	Regulated output terminal	Delivers stable 5.0 V to load; requires ≥100 µF tantalum or ceramic output capacitor (CO) for stability per Figure 20.
Pin 2 (GND)	Ground reference	Low-impedance return path; must be routed directly to power plane or star ground point to avoid noise coupling into feedback loop.
Pin 3 (VIN)	Unregulated input supply	Accepts 6–26 V DC; transient-rated to +60 V/–50 V; requires 0.1 µF ceramic input capacitor (CI) close to pin for high-frequency decoupling.

Key Features

Feature	Design Value
Automotive transient protection	Integrated +60 V load dump and –50 V reverse polarity shutdown - eliminates need for external protection diodes or TVS in ECU power stages.
Ultra-low dropout	90 mV typical at 10 mA - extends usable battery range below 6 V, supporting start-stop systems and deep-discharge recovery.
Wide temperature operation	–40 °C to +125 °C junction range - qualified for under-hood placement in engine control, transmission, and ADAS modules.
Low-noise regulation	500 µV_RMS output noise - meets noise budget for 12-bit+ ADCs and RF receiver bias rails in infotainment head units.
Internal protection	Current limit (100–300 mA) and thermal shutdown - prevents latch-up during short-circuit faults without external foldback circuitry.

Applications

Engine Control Unit (ECU) Sensor Supply

Body Control Module (BCM) Microcontroller Core

Use Scenario: Powers crankshaft position sensor and knock sensor in gasoline/diesel engine compartments where ambient reaches 125 °C.

IC Role / Device Role / Timing Role: Local 5 V LDO providing clean, stable bias independent of main 12 V rail fluctuations during cranking.

Use Value: 90 mV dropout ensures regulation remains active down to 5.25 V input, preventing sensor dropout during cold-start voltage sag.

Use Scenario: Supplies 5 V to 8-bit/16-bit MCUs (e.g., STM8, SPC5) in door modules and lighting controllers.

IC Role / Device Role / Timing Role: Always-on primary regulator for MCU VDD, with no enable control needed in this TO-92 variant.

Use Value: 2.5 mA quiescent current minimizes battery drain in sleep mode, extending vehicle parasitic draw compliance (< 50 µA target).

Telematics GPS/GLONASS Front-End

Automotive Infotainment Audio Codec Bias

Use Scenario: Provides low-noise 5 V to GPS RF front-end ICs (e.g., u-blox MAX-M8Q) mounted near roof antennas.

IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy digital domains using dedicated CO capacitor.

Use Value: 500 µV_RMS noise avoids phase noise degradation in GPS L1 band reception, preserving C/N0 ratio >42 dB-Hz.

Use Scenario: Powers audio codec ICs (e.g., AK4642) in head units where EMI from display drivers threatens signal integrity.

IC Role / Device Role / Timing Role: Dedicated 5 V analog rail isolated from digital 3.3 V domain, with separate ground trace routing.

Use Value: ±3% output accuracy ensures consistent ADC/DAC reference scaling across temperature, avoiding audio gain drift.

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
LM2931DT50R	DPAK package (R_thJA = 100 °C/W), AEC-Q100 qualified, includes inhibit pin (VINH)	Supports remote shutdown in multi-rail systems; higher power handling due to lower thermal resistance	Select when board space allows surface-mount, thermal margin is constrained, or system-level power sequencing is required.
TLV73350PDBVR	300 mA output, 170 mV dropout at 300 mA, 50 µA quiescent current, SOT-23-5 package	Lower IQ enables ultra-low-power wake-on-radio designs; higher current supports more peripherals per rail	Select when load exceeds 100 mA or standby current budget is < 100 µA; verify stability with 1–10 µF CO (not 100 µF).

Compared with LM2931AZ50AP, the DPAK LM2931DT50R offers better thermal performance and functional flexibility via inhibit control, while the TLV73350PDBVR trades automotive ruggedness for ultra-low IQ and higher current-making it suitable for non-automotive portable electronics but not under-hood use.

Availability

LM2931AZ50AP is available at Aetrix Electronics and suitable for automotive engine control, body electronics, telematics, and infotainment systems requiring stable component supply with long lifecycle assurance and AEC-compliant sourcing.

Supply support for LM2931AZ50AP 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 consumer markets since 1987.

The LM2931 series belongs to ST's automotive-qualified linear regulator product line, engineered specifically for harsh-temperature, high-transient environments in vehicle electronic control units and safety-critical subsystems.

FAQ

Is LM2931AZ50AP AEC-Q100 qualified?

No. Only the DPAK package variants (e.g., LM2931ADT50R) are AEC-Q100 qualified per the datasheet features section. The TO-92 packaged LM2931AZ50AP is not certified, though it shares the same electrical and protection specifications and operates across the full –40 °C to 125 °C junction temperature range.

What is the minimum input voltage required for regulation at 100 mA load?

The minimum input voltage is 5.25 V, calculated as V_OUT + V_d(max) = 5.0 V + 0.25 V = 5.25 V. At 100 mA, worst-case dropout is 600 mV (Table 4), so 5.6 V input guarantees regulation; however, 5.25 V is sufficient per typical 250 mV dropout spec.

Can LM2931AZ50AP be used with ceramic output capacitors?

Yes, but only within the stability zone defined in Figure 20 (DS1760 p.11): for CO = 10–100 µF and ESR ≥ 10 mΩ. Standard X7R/X5R ceramics meet this if derated for DC bias; avoid ultra-low-ESR types (< 5 mΩ) unless compensated per application note AN4405.

Does LM2931AZ50AP have an enable/inhibit pin?

No. The TO-92 variant (LM2931AZ50AP) has only three pins (VIN, GND, VOUT) and no inhibit function. Enable control is exclusive to the 8-pin SO-8 version (e.g., LM2931AD50R), where Pin 1 is VINH.

LM2931AZ50AP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Box (TB)

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-92-3

LM2931AZ50AP FAQ

1.How can I place an order for LM2931AZ50AP through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2931AZ50AP 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 LM2931AZ50AP reliable?

The price and inventory of LM2931AZ50AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2931AZ50AP is usually 5 days.

3.What payment methods are accepted for LM2931AZ50AP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2931AZ50AP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2931AZ50AP?

LM2931AZ50AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2931AZ50AP 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 LM2931AZ50AP?

For technical support, including LM2931AZ50AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2931AZ50AP requirements.

6.How does Aetrix verify that LM2931AZ50AP is sourced from the original manufacturer or authorized distributors?

All LM2931AZ50AP 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 LM2931AZ50AP meets industry standards.

7.What is the process for return or replacement of LM2931AZ50AP?

All LM2931AZ50AP units undergo pre-shipment inspection (PSI). If there is an issue with LM2931AZ50AP, 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 LM2931AZ50AP part is unused and in its original packaging.

Return procedure for LM2931AZ50AP:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

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…