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Texas Instruments LMV431AIMF
- Part No.:
- LMV431AIMF
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LMV431AIMF.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,809
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Product details
Overview
LMV431AIMF from Texas Instruments is an industrial-grade, adjustable precision shunt regulator with 1.24 V bandgap reference, ±0.5% initial tolerance (at 25°C), 39 ppm/°C temperature coefficient, 55 µA minimum cathode current for regulation, and 0.25 Ω dynamic output impedance. It operates from 1.24 V to 30 V and serves as a voltage reference or error amplifier in low-voltage power management circuits.
For engineers reviewing the LMV431AIMF datasheet, LMV431AIMF pinout, LMV431AIMF application, or LMV431AIMF equivalent, this page delivers verified electrical specs, SOT-23-3 package details, functional pin roles, real-world use cases in shunt regulation and overvoltage protection, and two validated alternative parts with documented technical differences.
Technical Context
The LMV431AIMF functions as a 3-terminal adjustable shunt regulator using negative feedback from cathode to adjust pin-mirroring a non-inverting op-amp configuration. Its internal bandgap reference sets the 1.24 V baseline, while external resistor dividers program output voltage up to 30 V.
It achieves industrial temperature range operation (−40°C to +85°C) with 39 ppm/°C reference drift, supports stable operation with capacitive loads from 1 pF to 10 kΩ, and exhibits fast turn-on response suitable for error amplification in switching regulators and voltage monitoring circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal at 25°C; tight ±0.5% initial tolerance enables accurate voltage setting without calibration. |
| Tempco | 39 ppm/°C; ensures ≤20 mV total reference deviation across −40°C to +85°C for stable closed-loop performance. |
| Min Cathode Current | 55 µA; lowest current needed to maintain regulation-critical for ultra-low-power biasing and sensing. |
| Dynamic Output Impedance | 0.25 Ω; provides high PSRR and low AC impedance for clean reference delivery into dynamic loads. |
| Operating Range | 1.24 V to 30 V cathode voltage; supports wide-range programmability from LDO feedback to 24 V system monitoring. |
| Off-State Current | ≤0.1 µA at 6 V cathode; minimizes leakage in battery-backed or always-on monitoring circuits. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, single-row 3-pin surface-mount outline with gull-wing leads. RoHS-compliant, Sn lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current sink terminal | Connects to ground or low-impedance return path; carries full cathode current minus reference input current. |
| Pin 2 (Cathode) | Regulated output node | Delivers programmed voltage; connects to feedback divider top or load; must be decoupled per stability guidelines. |
| Pin 3 (Adjust) | Reference input / error sense | High-impedance (≤0.5 µA) input that samples divided cathode voltage; controls regulation via feedback loop. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V-enables use in 1.8 V, 2.5 V, and 3 V systems where Zener diodes fail. |
| Industrial temp grade | Specified from −40°C to +85°C with 39 ppm/°C tempco-meets requirements for automotive body electronics and industrial PLCs. |
| Low quiescent current | 55 µA min cathode current allows microamp-level bias networks in energy-harvesting or battery-critical designs. |
| Capacitive load stability | Stable with 1 pF–10 kΩ capacitive loads-eliminates need for external compensation in most feedback configurations. |
| Fast turn-on response | Enables use in transient-sensitive applications like crowbar protection and power-good signaling. |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
Use Scenario: Providing precise 3.3 V rail from a 5 V supply in space-constrained IoT sensor nodes. IC Role / Device Role / Timing Role: Adjustable shunt reference establishing regulated output voltage via R1/R2 feedback network. Use Value: Replaces discrete Zener + transistor solution with 0.5% accuracy, 39 ppm/°C drift, and SOT-23-3 footprint. | Use Scenario: Enhancing line/load regulation of a fixed 5 V linear regulator (e.g., LM7805) in industrial control modules. IC Role / Device Role / Timing Role: Error amplifier comparing sampled output to 1.24 V reference and driving pass transistor base. Use Value: Enables adjustable output and improved regulation vs. standard 3-terminal regulator alone. |
| Voltage Monitor | Overvoltage Protection |
Use Scenario: Detecting brownout conditions on a 12 V automotive subsystem bus. IC Role / Device Role / Timing Role: Precision threshold detector triggering MCU interrupt when voltage drops below 11.5 V. Use Value: Achieves ±0.5% trip point accuracy across temperature-superior to resistor-divider + comparator approaches. | Use Scenario: Safeguarding FPGA I/O banks against >3.6 V transients in telecom interface cards. IC Role / Device Role / Timing Role: Triggering SCR-based crowbar circuit when sensed voltage exceeds 3.6 V. Use Value: Delivers sub-µs response and stable 3.6 V threshold without hysteresis components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 0.5% initial tolerance, 100 µA min cathode current, 0.35 Ω output impedance, same SOT-23-3 package. | Higher min cathode current reduces usable range in ultra-low-current bias networks. | Select TLVH431ACDBVR only if higher cathode drive capability is required and 0.35 Ω impedance is acceptable. |
| LM4040CIM3-ADJ/NOPB | Fixed 2.5 V reference (non-adjustable), 0.5% tolerance, 60 µA max quiescent current, SOT-23-3. | Cannot be programmed above 2.5 V; lacks adjust pin-unsuitable for variable-output or high-voltage monitoring. | Choose LM4040CIM3-ADJ/NOPB only for fixed 2.5 V reference needs where programmability is unnecessary. |
Compared with TLVH431ACDBVR, LMV431AIMF offers lower dynamic impedance (0.25 Ω vs. 0.35 Ω) and lower minimum cathode current (55 µA vs. 100 µA), enabling tighter regulation in low-power designs; compared with LM4040CIM3-ADJ/NOPB, it provides full 1.24–30 V adjustability and active feedback control-making it suitable for closed-loop regulation, not just passive referencing.
Availability
LMV431AIMF is available at Aetrix Electronics and suitable for shunt regulation, series regulator feedback, voltage monitoring, and overvoltage protection applications requiring stable component supply across industrial temperature ranges.
Supply support for LMV431AIMF 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in precision analog ICs.
The LMV431 family was designed specifically for low-voltage, high-accuracy shunt regulation in cost-sensitive industrial and consumer power systems-emphasizing small footprint, wide adjustability, and robust thermal performance.
FAQ
What is the operating temperature range for LMV431AIMF?
The LMV431AIMF is rated for industrial temperature operation from −40°C to +85°C. This range is confirmed in Section 7.3 (Recommended Operating Conditions) and Table 7.8 (LMV431AI Electrical Characteristics) of the SNVS041G datasheet. Its 39 ppm/°C temperature coefficient ensures reference stability across this full span, making LMV431AIMF suitable for under-hood automotive sensors and factory-floor controllers.
Does LMV431AIMF require external compensation for stability?
No, LMV431AIMF is internally compensated and stable with capacitive loads ranging from 1 pF to 10 kΩ, as specified in the "Typical Application" section (Figure 19, Stability Boundary Condition) and confirmed in the Applications overview. This eliminates the need for external phase-compensation networks in standard shunt or series regulator configurations using LMV431AIMF.
What is the minimum cathode current required for regulation in LMV431AIMF?
The LMV431AIMF requires a minimum cathode current of 55 µA to maintain regulation, per Section 7.8 (LMV431AI Electrical Characteristics) of the datasheet. This value is guaranteed across the full −40°C to +85°C temperature range and enables reliable operation in ultra-low-power bias networks where traditional Zeners would fail to regulate.
Can LMV431AIMF be used as a 1.24 V fixed reference?
Yes, LMV431AIMF can operate as a fixed 1.24 V reference by shorting the cathode to the adjust pin (voltage-follower configuration), as explicitly described in the "Description" section of the datasheet. In this mode, LMV431AIMF delivers its nominal 1.24 V reference with the same 0.5% initial tolerance and 39 ppm/°C tempco as in adjustable mode.
What package type does LMV431AIMF use, and is it RoHS-compliant?
LMV431AIMF uses the SOT-23-3 (DBZ) package-2.92 mm × 1.30 mm body size with gull-wing leads-and is RoHS-compliant with Sn lead finish, as documented in the "PACKAGE OPTION ADDENDUM" (page 19) of SNVS041G. Its MSL Level-1 rating confirms suitability for standard reflow assembly without moisture sensitivity concerns.
LMV431AIMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 30 V
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LMV431AIMF FAQ
1.How can I place an order for LMV431AIMF through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431AIMF 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 LMV431AIMF reliable?
The price and inventory of LMV431AIMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431AIMF is usually 5 days.
3.What payment methods are accepted for LMV431AIMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431AIMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431AIMF?
LMV431AIMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431AIMF 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 LMV431AIMF?
For technical support, including LMV431AIMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431AIMF requirements.
6.How does Aetrix verify that LMV431AIMF is sourced from the original manufacturer or authorized distributors?
All LMV431AIMF 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 LMV431AIMF meets industry standards.
7.What is the process for return or replacement of LMV431AIMF?
All LMV431AIMF units undergo pre-shipment inspection (PSI). If there is an issue with LMV431AIMF, 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 LMV431AIMF part is unused and in its original packaging.
Return procedure for LMV431AIMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431AIMF Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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