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Texas Instruments LMV431BIMF
- Part No.:
- LMV431BIMF
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LMV431BIMF.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:632
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Product details
Overview
LMV431BIMF from Texas Instruments is a precision 1.24-V adjustable shunt regulator in SOT-23-3 package, designed for low-voltage regulation (1.24 V to 30 V), featuring 0.5% initial reference voltage tolerance, 55 µA minimum cathode current for regulation, 0.25 Ω dynamic output impedance, and industrial temperature range (−40°C to +85°C). It serves as an error amplifier in 3-V off-line switching regulators and voltage monitors in space-constrained power management circuits.
For engineers reviewing the LMV431BIMF datasheet, LMV431BIMF pinout, LMV431BIMF application, or LMV431BIMF equivalent, this page delivers verified electrical specifications, functional pin mapping, real-world implementation contexts, and validated alternative parts - all aligned to TI's SNVS041G revision G datasheet and official orderable packaging data.
Technical Context
The LMV431BIMF operates as a two-terminal adjustable shunt reference with internal band-gap reference and op-amp-like feedback control: cathode voltage is regulated via external resistor divider connected to the adjust (REF) terminal. Its architecture enables stable operation with capacitive loads from 1 pF to 10 kΩ, supporting fast turn-on response and low-noise performance.
It functions across −40°C to +85°C with 39 ppm/°C temperature coefficient (typical), 35 V absolute max cathode voltage rating, and 30 mA continuous cathode current capability. The device draws only 55 µA quiescent current at regulation threshold and maintains <12 mV reference deviation over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V (nominal); ±0.5% initial tolerance at 25°C - enables precise voltage setting in feedback loops without calibration. |
| Temperature Range | −40°C to +85°C - qualified for industrial environments including motor drives and PLC I/O modules. |
| Dynamic Output Impedance | 0.25 Ω - ensures minimal output voltage shift under load transients, critical for stable error amplification. |
| Min Cathode Current | 55 µA - lowest current needed to maintain regulation, enabling ultra-low-power biasing in battery-backed systems. |
| Reference Input Current | 0.15–0.5 µA - ultra-low REF pin current minimizes divider resistor loading error and improves accuracy. |
| Tempco | 39 ppm/°C - predictable drift behavior supports accurate long-term voltage monitoring in unregulated supplies. |
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) | Anode connection | Internally tied to cathode through internal transistor; must be connected to system ground or return path. |
| Pin 2 (Cathode) | Output terminal | Regulated output node; sinks current to maintain set voltage - connects to feedback point of DC-DC converter or voltage monitor. |
| Pin 3 (REF) | Adjust/reference input | High-impedance reference input; connects to resistor divider midpoint - controls cathode voltage via VCATHODE = VREF × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 1.8-V and 3.3-V systems where Zener diodes fail to conduct. |
| 0.5% initial tolerance | Reduces need for post-manufacture trimming in precision power supplies and sensor excitation circuits. |
| Stable with wide capacitance range | Operates reliably with 1 pF–10 kΩ capacitive loads - simplifies layout in noisy switcher feedback paths. |
| Low operating current | 55 µA regulation threshold allows use in always-on monitoring circuits powered by energy-harvesting sources. |
| Fast turn-on response | Enables rapid fault detection in overvoltage protection circuits with sub-microsecond reaction time. |
Applications
| 3-V Off-Line Switching Regulator | Voltage Monitor |
|---|---|
Use Scenario: Feedback control loop in isolated flyback converters operating from 3-V input rails. IC Role / Device Role / Timing Role: Error amplifier comparing sensed output voltage against 1.24-V reference to drive optocoupler input. Use Value: Enables compact, low-cost regulation without external op-amps while maintaining ±1% output accuracy over line/load/temperature. |
Use Scenario: Detecting undervoltage or overvoltage conditions on microcontroller supply rails. IC Role / Device Role / Timing Role: Precision threshold detector triggering reset or alert signals when rail deviates beyond ±2%. Use Value: Delivers 0.5% trip-point accuracy and immunity to supply ripple due to high PSRR and low input bias current. |
| Low Dropout N-Channel Series Regulator | Current Source or Sink |
Use Scenario: Generating stable 2.5-V bias for analog front-ends from a noisy 3.3-V supply. IC Role / Device Role / Timing Role: Shunt-based pass element controlling gate voltage of external N-MOSFET to regulate output. Use Value: Achieves <100 mV dropout at 10 mA while eliminating thermal runaway risk inherent in bipolar pass devices. |
Use Scenario: Providing constant LED drive current in automotive interior lighting modules. IC Role / Device Role / Timing Role: Two-resistor-configured constant-current sink with cathode as current return path. Use Value: Maintains ±1.5% current accuracy over temperature with no external op-amp or sense resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 1.24 V reference, 0.5% tolerance, but rated only for 0°C to 70°C commercial temp range; higher 75 µA min cathode current. | Not suitable for industrial ambient or extended-temperature designs requiring −40°C startup. | Select TLVH431ACDBVR only for cost-sensitive consumer-grade 3.3-V systems with limited thermal budget. |
| LM4040CIM3-ADJ/NOPB | Fixed 2.5-V or 4.096-V reference (non-adjustable); 0.5% tolerance; requires external resistor network to emulate adjustable behavior. | Lacks native adjustability - adds complexity and error sources when targeting voltages outside its fixed options. | Choose LM4040CIM3-ADJ/NOPB only if fixed reference voltage suffices and board area permits added passive components. |
Compared with TLVH431ACDBVR and LM4040CIM3-ADJ/NOPB, the LMV431BIMF uniquely combines industrial temperature rating, true 1.24–30 V adjustability, and sub-100 µA regulation threshold - making it the optimal choice for ruggedized, low-power, wide-range shunt regulation.
Availability
LMV431BIMF is available at Aetrix Electronics and suitable for 3-V off-line switching regulators, voltage monitors, low-dropout series regulators, and current source/sink circuits requiring stable component supply with guaranteed industrial temperature qualification and RoHS compliance.
Supply support for LMV431BIMF 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and power management technologies.
The LMV431BIMF belongs to TI's precision shunt regulator product line, engineered specifically for low-voltage, high-accuracy regulation in space-constrained industrial and communications power systems where Zener diodes fall short.
FAQ
What is the maximum cathode voltage rating for LMV431BIMF?
The LMV431BIMF has an absolute maximum cathode voltage rating of 35 V. Exceeding this value risks permanent damage. In normal operation, cathode voltage is set by the external resistor divider and must remain within the recommended operating range of VREF to 30 V per the datasheet. This rating allows safe use in 24-V industrial bus monitoring and 30-V DC-DC feedback applications.
Does LMV431BIMF require an external capacitor for stability?
No, the LMV431BIMF is internally compensated and stable with capacitive loads ranging from 1 pF to 10 kΩ - no external compensation capacitor is required. This eliminates layout sensitivity and reduces BOM count in applications like voltage monitors and error amplifiers. However, a small ceramic capacitor (e.g., 100 pF) may be added at the REF pin to suppress high-frequency noise in noisy environments.
How does the LMV431BIMF differ from the LMV431AIMF?
The LMV431BIMF offers 0.5% initial reference voltage tolerance versus 1% for the LMV431AIMF, and tighter reference deviation over temperature (±4 mV vs. ±6 mV). Both share identical SOT-23-3 (DBZ) packaging, −40°C to +85°C rating, and pinout. The LMV431BIMF is preferred where higher accuracy is critical - such as in precision ADC references or closed-loop power supply trimming.
Can LMV431BIMF be used as a 1.24-V voltage follower?
Yes - connecting the cathode directly to the REF pin configures the LMV431BIMF as a 1.24-V voltage follower. In this mode, the cathode outputs a stable 1.24 V referenced to the anode (ground), drawing only 55 µA minimum current. This configuration is commonly used for precision biasing of op-amp inputs or sensor bridges where low quiescent current and tight tolerance are essential.
What is the thermal resistance (RθJA) of the LMV431BIMF in SOT-23-3 package?
The LMV431BIMF in SOT-23-3 (DBZ) package has a junction-to-ambient thermal resistance (RθJA) of 455°C/W. At 25°C ambient and 15 mA cathode current (max dissipation ~450 mW), junction temperature rise would be ~205°C - exceeding the 150°C absolute maximum. Therefore, derating is mandatory: power dissipation must be limited to ≤280 mW at 25°C, decreasing linearly above that ambient temperature per the datasheet derating curve.
LMV431BIMF 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:
- ±0.5%
- 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
LMV431BIMF FAQ
1.How can I place an order for LMV431BIMF through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431BIMF 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 LMV431BIMF reliable?
The price and inventory of LMV431BIMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431BIMF is usually 5 days.
3.What payment methods are accepted for LMV431BIMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431BIMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431BIMF?
LMV431BIMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431BIMF 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 LMV431BIMF?
For technical support, including LMV431BIMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431BIMF requirements.
6.How does Aetrix verify that LMV431BIMF is sourced from the original manufacturer or authorized distributors?
All LMV431BIMF 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 LMV431BIMF meets industry standards.
7.What is the process for return or replacement of LMV431BIMF?
All LMV431BIMF units undergo pre-shipment inspection (PSI). If there is an issue with LMV431BIMF, 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 LMV431BIMF part is unused and in its original packaging.
Return procedure for LMV431BIMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431BIMF Tags
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