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Texas Instruments LMV431BCM5/NOPB
- Part No.:
- LMV431BCM5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431BCM5/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:478
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Product details
Overview
LMV431BCM5/NOPB from Texas Instruments is a precision 1.24-V adjustable shunt regulator in SOT-23-5 package, designed for low-voltage regulation down to 2.7 V with 0.5% initial tolerance, 55 µA minimum cathode current, and 0.25 Ω dynamic output impedance. It functions as a programmable voltage reference in feedback loops of switching regulators and voltage monitors.
For engineers reviewing the LMV431BCM5/NOPB datasheet, LMV431BCM5/NOPB pinout, LMV431BCM5/NOPB application, or LMV431BCM5/NOPB equivalent, key selection criteria include its industrial-grade temperature range (−40°C to +85°C), stable operation with capacitive loads from 1 pF to 10 kΩ, and compatibility with two-resistor external programming for output voltages up to 30 V.
Technical Context
The LMV431BCM5/NOPB implements a band-gap reference core with negative feedback from cathode to adjust pin, operating like a non-inverting op-amp configuration. Its internal architecture enables precise voltage regulation without requiring external compensation across wide load capacitance ranges.
It supports three primary operating modes: voltage follower (cathode-to-adjust shorted for fixed 1.24 V), adjustable shunt regulator (via R1/R2 divider), and error amplifier (in closed-loop DC/DC control). The device maintains regulation with cathode currents from 55 µA to 15 mA and tolerates cathode voltages up to 35 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.234 V to 1.246 V at 25°C (0.5% initial tolerance); ensures tight setpoint accuracy in feedback networks |
| Temperature Range | −40°C to +85°C (industrial grade); validated for embedded power management in harsh environments |
| Dynamic Output Impedance | 0.25 Ω typical; minimizes output voltage deviation under dynamic load transients |
| Minimum Cathode Current | 55 µA; enables stable regulation in ultra-low-power applications such as battery-backed monitoring |
| Cathode Voltage Range | 1.24 V to 30 V (programmable); supports wide-output-range shunt regulation without external op-amps |
| Reference Input Current | 0.15 µA to 0.5 µA; reduces divider resistor power loss and improves high-impedance sensing accuracy |
| Tempco | 39 ppm/°C (LMV431BI variant); guarantees predictable drift behavior over full operating range |
Pinout & Package
SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, surface-mount, RoHS-compliant with Sn lead finish and Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No internal connection | Must be left unconnected; no electrical function or thermal role |
| Pin 2 (Anode) | Anode terminal | Common return path for cathode current; connects to system ground or negative rail |
| Pin 3 (Cathode) | Output voltage node | Delivers regulated voltage; sinks current into external load or feedback network |
| Pin 4 (Adjust) | Reference input | Controls cathode voltage via resistive divider; high-impedance input (≤0.5 µA bias) |
| Pin 5 (Anode) | Redundant anode connection | Internally tied to Pin 2; may be used for improved thermal or current-handling performance |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial reference tolerance | Reduces need for post-manufacturing calibration in precision voltage monitoring circuits |
| Low 55 µA regulation threshold | Enables use in energy-harvesting and always-on sensor nodes where quiescent current is critical |
| Stable with 1 pF–10 kΩ capacitive loads | Eliminates need for external compensation in most SMPS feedback designs |
| 35 V absolute max cathode voltage | Supports direct interface with 24 V industrial rails and flyback snubber circuits |
| −40°C to +85°C operating range | Validated for automotive body electronics and industrial PLC I/O modules |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
Use Scenario: Providing precise 3.3 V rail from 5 V supply in space-constrained IoT sensor node. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting output voltage via R1/R2 divider; replaces discrete Zener + transistor solution. Use Value: Achieves ±0.5% output accuracy with <100 µA total quiescent current, reducing BOM count by 3 components. |
Use Scenario: Enhancing line/load regulation of fixed 5 V linear regulator in medical diagnostic equipment. IC Role / Device Role / Timing Role: Error amplifier comparing output against 1.24 V reference; drives pass transistor base. Use Value: Improves output stability to ±0.2% over temperature and load, meeting IEC 60601 ripple requirements. |
| Voltage Monitor | Current Source/Sink |
Use Scenario: Detecting undervoltage condition on 12 V battery backup in telecom shelf controller. IC Role / Device Role / Timing Role: Precision threshold detector triggering shutdown when voltage drops below 10.8 V. Use Value: Delivers 1% trip-point accuracy over −40°C to +85°C, eliminating need for microcontroller ADC polling. |
Use Scenario: Generating 2 mA constant current for LED status indicator in industrial HMI panel. IC Role / Device Role / Timing Role: Two-terminal current source using cathode–adjust connection with single series resistor. Use Value: Maintains ±2% current accuracy across 3–24 V input range, independent of LED forward voltage variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 0.5% tolerance, 1.24 V reference, SOT-23-5, but rated only for 0°C to +70°C commercial range | Limited to consumer-grade products; lacks industrial temp validation and lower IREF (0.1 µA typ) | Select when cost is prioritized over extended temperature operation and ultra-low bias current |
| AS431BNTR-G1 | 0.5% tolerance, same 1.24 V reference, SOT-23-5, but higher rZ (0.5 Ω) and wider VREF drift (50 ppm/°C) | Acceptable for non-critical power sequencing; less suitable for precision feedback loops | Choose for legacy design reuse where TI part obsolescence is a concern, accepting minor performance trade-offs |
Compared with TLVH431ACDBVR and AS431BNTR-G1, the LMV431BCM5/NOPB delivers superior thermal stability (39 ppm/°C vs. ≥50 ppm/°C), lower dynamic impedance (0.25 Ω vs. ≥0.5 Ω), and guaranteed industrial temperature operation - making it optimal for closed-loop regulation in mission-critical embedded systems.
Availability
LMV431BCM5/NOPB is available at Aetrix Electronics and suitable for industrial power management, battery-backed voltage monitoring, and precision feedback loop applications requiring stable component supply and long-term lifecycle support.
Supply support for LMV431BCM5/NOPB 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 and embedded processing technologies, with decades of expertise in precision voltage references and power management ICs.
The LMV431 family was developed to replace Zener diodes in low-voltage, high-accuracy regulation applications - targeting cost-sensitive yet performance-demanding designs in industrial, telecom, and automotive subsystems.
FAQ
What is the maximum cathode voltage supported by the LMV431BCM5/NOPB?
The LMV431BCM5/NOPB supports a maximum cathode voltage of 35 V per absolute maximum ratings. This allows safe operation in 24 V industrial systems and flyback converter snubbers. Exceeding this voltage risks permanent damage, even briefly. The device regulates stably from 1.24 V up to 30 V when configured with external resistors.
Can the LMV431BCM5/NOPB replace a standard Zener diode in existing designs?
Yes, the LMV431BCM5/NOPB can directly replace Zener diodes in shunt regulation roles, especially where low voltage (<3 V), tight tolerance (<1%), or temperature stability is required. Unlike Zeners, it requires only two external resistors for adjustment and draws far less reference current (≤0.5 µA), reducing divider power loss significantly.
Does the LMV431BCM5/NOPB require external compensation for stability?
No, the LMV431BCM5/NOPB is internally compensated and remains stable with capacitive loads from 1 pF to 10 kΩ, as confirmed in Figure 19 of the datasheet. This eliminates external compensation components in most SMPS feedback and voltage monitor applications, simplifying layout and improving reliability.
What is the significance of Pin 1 being NC on the LMV431BCM5/NOPB?
Pin 1 on the LMV431BCM5/NOPB is not internally connected and must remain unconnected. It serves no electrical or thermal function. Routing traces or soldering to Pin 1 may cause mechanical stress or unintended coupling; best practice is to omit pad or leave it floating per TI's recommended footprint.
How does the LMV431BCM5/NOPB achieve 0.5% initial tolerance?
The LMV431BCM5/NOPB achieves 0.5% initial tolerance through laser-trimmed band-gap reference circuitry during final test. This trimming occurs at 25°C with 10 mA cathode current, yielding a reference voltage range of 1.234 V to 1.246 V. The LMV431BCM5/NOPB maintains this accuracy across its full industrial temperature range with 39 ppm/°C drift.
LMV431BCM5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMV431BCM5/NOPB FAQ
1.How can I place an order for LMV431BCM5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431BCM5/NOPB 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 LMV431BCM5/NOPB reliable?
The price and inventory of LMV431BCM5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431BCM5/NOPB is usually 5 days.
3.What payment methods are accepted for LMV431BCM5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431BCM5/NOPB transactions.
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4.How is shipping managed for LMV431BCM5/NOPB?
LMV431BCM5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431BCM5/NOPB 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 LMV431BCM5/NOPB?
For technical support, including LMV431BCM5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431BCM5/NOPB requirements.
6.How does Aetrix verify that LMV431BCM5/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV431BCM5/NOPB 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 LMV431BCM5/NOPB meets industry standards.
7.What is the process for return or replacement of LMV431BCM5/NOPB?
All LMV431BCM5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV431BCM5/NOPB, 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 LMV431BCM5/NOPB part is unused and in its original packaging.
Return procedure for LMV431BCM5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431BCM5/NOPB Tags
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