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STMicroelectronics LM2931AZ50R
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- Part No.:
- LM2931AZ50R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LM2931AZ50R.pdf
- Description:
- IC REG LINEAR 5V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,228
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Product details
Overview
LM2931AZ50R 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 full load, and automotive-grade protection including ±50 V reverse transient tolerance and 60 V load dump immunity. It operates across –40 °C to +125 °C and is widely deployed in engine control units, body electronics, and battery-powered automotive sensors.
For engineers reviewing the LM2931AZ50R datasheet, LM2931AZ50R pinout, LM2931AZ50R application, or LM2931AZ50R equivalent, key selection criteria include dropout voltage under light/heavy load, thermal resistance (RthJA = 200 °C/W for TO-92), inhibit logic compatibility, reverse polarity survival, and AEC-Q100 qualification status - all confirmed in DS1760 Rev 24.
Technical Context
The LM2931AZ50R implements a PNP-based LDO architecture with internal current and thermal limiting, enabling stable regulation even during input transients up to 60 V (100 ms) or reverse inputs down to –50 V. Its inhibit function (pin 1) enables shutdown when VINH > 3.25 V, reducing quiescent current to ≤1 µA in OFF mode.
Unlike standard 78L-series regulators, it integrates load-dump protection that autonomously disables output when VI exceeds 26 V, safeguarding downstream circuitry without external components. The TO-92 variant lacks inhibit control (pin 1 = VOUT), distinguishing it from SO-8 and DPAK versions with full logic-enable capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 5.0 V ±2.5% (4.75–5.25 V) over –40 to +125 °C and 5–100 mA load - ensures stable MCU core supply in automotive ambient extremes. |
| Dropout voltage | 90 mV typ. at 10 mA; 250–600 mV max at 100 mA - enables operation with input as low as 5.25 V while maintaining regulation. |
| Quiescent current | 2.5 mA typ. at 100 mA load; ≤1 mA in OFF mode - critical for always-on vehicle modules requiring ultra-low standby power. |
| Input transient rating | 60 V for <100 ms - survives ISO 7637-2 Pulse 5a load dump without latch-up or damage. |
| Reverse polarity rating | –50 V transient (100 ms) - withstands incorrect jump-start or battery reversal in 12 V systems. |
| Thermal resistance | RthJA = 200 °C/W (TO-92, no heatsink) - limits max junction temp to 125 °C at 100 mA with 25 °C ambient. |
| Noise voltage | 500 µVRMS (10 Hz–100 kHz) - suitable for analog sensor front-ends and RF subsystems requiring clean bias. |
Pinout & Package
LM2931AZ50R uses TO-92 package (3-pin, vertical mounting), with pin 1 = VOUT, pin 2 = GND, pin 3 = VIN (bottom view). No inhibit function is implemented in this variant; pin 1 is directly tied to regulated output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VOUT) | Regulated output terminal | Delivers fixed 5.0 V; must be decoupled with ≥100 µF capacitor per datasheet Figure 3; not logic-controllable in TO-92 version. |
| Pin 2 (GND) | Ground reference | Common return path for load current and internal bias; requires low-inductance connection to minimize noise coupling. |
| Pin 3 (VIN) | Unregulated input supply | Accepts 6–26 V DC; tolerates transients up to 60 V/–50 V; must include 0.1 µF ceramic bypass near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive transient protection | Integrated 60 V load dump and –50 V reverse polarity survival without external TVS - eliminates discrete protection components. |
| Ultra-low dropout | 90 mV typical at 10 mA enables use in low-headroom applications like start-stop battery systems (≥5.1 V input viable). |
| Wide temperature operation | –40 °C to +125 °C junction range supports placement near engines, under-hood ECUs, and transmission control modules. |
| Low-noise regulation | 500 µVRMS output noise (10 Hz–100 kHz) meets requirements for precision analog signal chains and CAN transceiver biasing. |
| Internal fault protection | Current limit (~300 mA) and thermal shutdown prevent damage during short-circuit or overload - no external foldback needed. |
Applications
| Engine Control Unit (ECU) Sensor Bias | Body Control Module (BCM) Power Rail |
|---|---|
|
Use Scenario: Powers crankshaft position sensor and knock sensor analog front-ends in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Local 5 V LDO providing low-noise, transient-hardened supply independent of main 12 V rail. Use Value: Maintains sensor accuracy during cranking dips (down to 6 V) and load dump events (60 V spikes), eliminating need for external clamping. |
Use Scenario: Supplies microcontroller I/O banks and LIN transceivers in door module and lighting control units. IC Role / Device Role / Timing Role: Always-on 5 V regulator with <1 mA shutdown current, enabling wake-on-LIN functionality. Use Value: Reduces BCM standby power by >95% vs. non-shutdown LDOs, extending battery life during vehicle sleep mode. |
| Telematics GPS/GLONASS Receiver | Automotive Infotainment Display Backlight Driver |
|
Use Scenario: Provides clean 5 V bias to GNSS RF front-end and baseband processor in telematics control units. IC Role / Device Role / Timing Role: Low-noise local regulator placed adjacent to RF section to suppress switching noise coupling. Use Value: 500 µVRMS noise floor prevents degradation of GPS C/N₀ ratio; thermal shutdown protects during enclosure overheating. |
Use Scenario: Supplies gate drive and logic for LED backlight boost controller ICs in instrument cluster displays. IC Role / Device Role / Timing Role: Stable 5 V rail tolerant of 12 V battery fluctuations during ignition cycling and alternator ripple. Use Value: 2.5% output tolerance ensures consistent LED current regulation; 26 V max input avoids dropout during alternator surges. |
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 (RthJA = 100 °C/W), AEC-Q100 qualified, includes inhibit pin (pin 1 = INH) | Supports active shutdown in multi-rail systems; higher power handling than TO-92 | Select when board space allows surface-mount packaging and logic-controlled power gating is required. |
| TLV73350PDBVR | 300 mA output, 170 mV dropout at 300 mA, SOT-23-5, no reverse polarity protection | Lacks load dump/reverse transient hardening; requires external TVS for automotive use | Choose only for non-automotive, space-constrained designs where 500 mA peak current is needed and transients are absent. |
Compared with LM2931AZ50R, the DPAK LM2931DT50R offers superior thermal performance and functional enable control but requires PCB rework; TLV73350PDBVR delivers higher current in smaller footprint but forfeits automotive-grade transient robustness entirely.
Availability
LM2931AZ50R is available at Aetrix Electronics and suitable for engine control units, body electronics modules, and telematics systems requiring stable component supply across extended temperature and harsh electrical environments.
Supply support for LM2931AZ50R 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 under-hood and chassis-mounted electronics needing high transient immunity, wide temperature operation, and AEC-Q100 compliance.
FAQ
Is LM2931AZ50R AEC-Q100 qualified?
No - only the DPAK variant (LM2931ADT50R) is explicitly AEC-Q100 qualified per DS1760 Rev 24. The TO-92 packaged LM2931AZ50R shares identical electrical and protection specifications but lacks formal qualification documentation. It is widely used in automotive applications where qualification is customer-verified.
What is the maximum input voltage for continuous operation?
The absolute maximum continuous input voltage is 26 V, as specified in Table 3 of DS1760 Rev 24. Exceeding this value risks permanent damage unless transient conditions apply (60 V for <100 ms). Operation above 26 V must rely on the device's autonomous shutdown behavior, not sustained regulation.
Does LM2931AZ50R support shutdown/inhibit functionality?
No - the TO-92 package (LM2931AZ50R) has no inhibit pin. Pin 1 is VOUT, not a control input. Inhibit functionality is exclusive to SO-8 and DPAK variants (pin 1 = INH), where VINH > 3.25 V disables output and reduces quiescent current to ≤1 mA.
Can LM2931AZ50R replace older 78L05 regulators in legacy designs?
Yes, with caveats: it matches 78L05's 5 V output and TO-92 footprint, but offers lower dropout (90 mV vs. ~1.7 V), better noise performance (500 µVRMS vs. ~40 µVRMS), and integrated transient protection. Input capacitor requirements differ - LM2931AZ50R needs only 0.1 µF ceramic, whereas 78L05 often requires larger electrolytics.
LM2931AZ50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LM2931AZ50R FAQ
1.How can I place an order for LM2931AZ50R through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2931AZ50R 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 LM2931AZ50R reliable?
The price and inventory of LM2931AZ50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2931AZ50R is usually 5 days.
3.What payment methods are accepted for LM2931AZ50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2931AZ50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2931AZ50R?
LM2931AZ50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2931AZ50R 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 LM2931AZ50R?
For technical support, including LM2931AZ50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2931AZ50R requirements.
6.How does Aetrix verify that LM2931AZ50R is sourced from the original manufacturer or authorized distributors?
All LM2931AZ50R 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 LM2931AZ50R meets industry standards.
7.What is the process for return or replacement of LM2931AZ50R?
All LM2931AZ50R units undergo pre-shipment inspection (PSI). If there is an issue with LM2931AZ50R, 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 LM2931AZ50R part is unused and in its original packaging.
Return procedure for LM2931AZ50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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