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Texas Instruments LMV431BCM5
- Part No.:
- LMV431BCM5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431BCM5.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,444
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Product details
Overview
LMV431BCM5 from Texas Instruments is a precision 1.24-V adjustable shunt regulator in SOT-23-5 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, and 0.25 Ω dynamic output impedance. It serves as an error amplifier in 3-V off-line switching regulators and voltage monitors in industrial power management systems.
For engineers reviewing the LMV431BCM5 datasheet, LMV431BCM5 pinout, LMV431BCM5 application, or LMV431BCM5 equivalent, key selection criteria include its 0.5% reference accuracy over −40°C to +85°C, low 55 µA regulation threshold, stable operation with 10 nF–50 pF capacitive loads, and compatibility with two-resistor feedback networks for programmable output voltage.
Technical Context
The LMV431BCM5 implements a band-gap reference core with negative feedback from cathode to adjust pin, operating like a non-inverting op amp where external resistors R1 and R2 set gain and output voltage. Its internal architecture enables precise voltage regulation without requiring external compensation under specified capacitive load conditions.
It functions across 0.1 mA to 15 mA cathode current range with 39 ppm/°C temperature coefficient (LMV431BI grade), supports cathode voltages up to 30 V, and maintains regulation down to 55 µA cathode current-critical for low-power biasing and sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C; sets base regulation point for programmable shunt output |
| Initial Tolerance | 0.5% (LMV431B grade); ensures tight voltage setting without trimming in production |
| Temp Coefficient | 39 ppm/°C (LMV431BI); guarantees <±12 mV drift over −40°C to +85°C |
| Min Cathode Current | 55 µA; enables stable regulation in ultra-low-power circuits (e.g., battery monitors) |
| Dynamic Impedance | 0.25 Ω; provides high PSRR and fast transient response in feedback loops |
| Cathode Voltage Range | 1.24 V to 30 V; supports wide-range programmable regulation without external series pass devices |
| Capacitive Load Stability | Stable with 10 nF to 50 pF; eliminates need for damping networks in compact designs |
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 MSL rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No internal connection | Must be left unconnected; no routing or grounding required |
| Pin 2 (Anode) | Anode terminal | Connects to system ground or low-side return path; defines reference node |
| Pin 3 (Cathode) | Cathode output | Delivers regulated voltage; sinks current to maintain VREF × (1 + R1/R2) |
| Pin 4 (Adjust) | Reference input | Feedback node for resistor divider; controls cathode voltage via negative feedback |
| Pin 5 (Anode) | Second anode connection | Internally tied to Pin 2; may be floated or connected to same ground node |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 1.8-V and 3-V systems where Zener diodes fail |
| 0.5% initial tolerance | Reduces calibration overhead in precision power supplies and voltage monitors |
| 55 µA regulation threshold | Supports energy harvesting and always-on monitoring circuits with microamp bias budgets |
| 0.25 Ω dynamic impedance | Minimizes output voltage droop during load transients in closed-loop regulators |
| Stability with small capacitors | Eliminates need for large bulk capacitance or RC snubbers in space-constrained layouts |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
Use Scenario: Providing precise 2.5-V bias for ADC reference in a 3.3-V industrial sensor node. IC Role / Device Role / Timing Role: Adjustable shunt regulator sinking excess current to hold voltage at 2.5 V using R1 = 10 kΩ, R2 = 20 kΩ. Use Value: Replaces discrete Zener + op-amp solution, reducing BOM count and PCB area while maintaining 0.5% accuracy over temperature. | Use Scenario: Enabling output voltage adjustment in a fixed 5-V LDO-based power rail. IC Role / Device Role / Timing Role: Error amplifier comparing feedback voltage against 1.24-V reference to control LDO pass transistor gate. Use Value: Allows programmable output from 1.24 V to 30 V without redesigning control loop compensation. |
| Voltage Monitor | Error Amplifier |
Use Scenario: Detecting undervoltage condition (<2.7 V) on a 3.3-V microcontroller supply rail. IC Role / Device Role / Timing Role: Configured as comparator with hysteresis via resistor network to trigger reset signal. Use Value: Achieves sub-10-mV detection threshold accuracy with built-in 39 ppm/°C tempco-no external trimming needed. | Use Scenario: Stabilizing output of a flyback converter by feeding isolated secondary-side feedback into primary controller. IC Role / Device Role / Timing Role: Isolated error amplifier transmitting regulation error across optocoupler with precise 1.24-V reference. Use Value: Delivers <±1% output regulation across line/load/temperature without secondary-side controller IC. |
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; higher 70 µA min cathode current | Limited to commercial-temperature applications; less suitable for industrial ambient monitoring | Select when cost sensitivity outweighs extended temperature requirement and higher regulation current is acceptable |
| LM4040CIM3-ADJ/NOPB | Fixed 2.5-V or 4.096-V reference; not adjustable; 0.5% tolerance; requires external op-amp for shunt regulation | Cannot directly replace LMV431BCM5 in adjustable shunt configurations without added components | Choose only for fixed-voltage reference needs where programmability is unnecessary and board space allows extra op-amp |
Compared with TLVH431ACDBVR and LM4040CIM3-ADJ/NOPB, the LMV431BCM5 uniquely combines 0.5% tolerance, −40°C to +85°C operation, adjustable 1.24–30 V output, and self-contained shunt functionality-enabling single-component solutions in industrial power supervision and isolated feedback loops.
Availability
LMV431BCM5 is available at Aetrix Electronics and suitable for industrial power supervision, isolated flyback feedback, and low-voltage precision biasing requiring stable component supply across extended temperature ranges.
Supply support for LMV431BCM5 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 for industrial, automotive, and personal electronics markets.
The LMV431 family was engineered for precision low-voltage shunt regulation in space-constrained, cost-sensitive power management applications-including 3-V switching regulators, voltage monitors, and current sources-where Zener diodes lack accuracy and stability.
FAQ
What is the operating temperature range for the LMV431BCM5?
The LMV431BCM5 is rated for −40°C to +85°C operation, matching the LMV431BI grade specification. This extended industrial temperature range ensures reliable performance in harsh environments such as factory automation controllers and outdoor power converters. The LMV431BCM5 datasheet confirms this range in Section 7.3 (Recommended Operating Conditions) and Table 7.1 (Absolute Maximum Ratings).
How does the LMV431BCM5 achieve adjustable output voltage?
The LMV431BCM5 achieves adjustable output voltage through external resistor feedback: cathode voltage equals VREF × (1 + R1/R2), where R1 connects cathode to adjust pin and R2 connects adjust pin to anode (ground). This two-resistor network leverages the device's internal 1.24-V band-gap reference and high-gain error amplifier. The LMV431BCM5 functional diagram (Figure 4) and typical application circuits (Figures 23–31) validate this configuration.
Can the LMV431BCM5 replace a Zener diode in existing designs?
Yes-the LMV431BCM5 can directly replace Zener diodes in shunt regulator and voltage reference roles, offering superior 0.5% initial tolerance, lower dynamic impedance (0.25 Ω vs. typical Zener's >10 Ω), and stable operation with small capacitive loads (10 nF–50 pF). Unlike Zeners, it requires only two external resistors for adjustment and delivers consistent performance across temperature. Designers should verify cathode current remains ≥55 µA per LMV431BCM5 datasheet Section 7.9.
What is the minimum cathode current required for regulation in the LMV431BCM5?
The LMV431BCM5 requires a minimum cathode current of 55 µA to maintain regulation, as specified in Section 7.9 (LMV431BC Electrical Characteristics) of the SNVS041G datasheet. This low threshold enables use in ultra-low-power applications such as battery-backed voltage monitors and energy-harvesting circuits where supply current is tightly constrained.
Is the LMV431BCM5 stable with ceramic capacitors?
Yes-the LMV431BCM5 is stable with ceramic capacitors ranging from 10 nF to 50 pF, as confirmed in the "Typical Application" section (Figure 19, Stability Boundary Condition) and Section 1 (Features) of the datasheet. This eliminates the need for electrolytic or tantalum capacitors in most implementations, supporting compact, high-reliability designs. Larger capacitors (>100 nF) may cause instability unless compensated per Figure 19 guidance.
LMV431BCM5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMV431BCM5 FAQ
1.How can I place an order for LMV431BCM5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431BCM5 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 reliable?
The price and inventory of LMV431BCM5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431BCM5 is usually 5 days.
3.What payment methods are accepted for LMV431BCM5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431BCM5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431BCM5?
LMV431BCM5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431BCM5 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?
For technical support, including LMV431BCM5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431BCM5 requirements.
6.How does Aetrix verify that LMV431BCM5 is sourced from the original manufacturer or authorized distributors?
All LMV431BCM5 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 meets industry standards.
7.What is the process for return or replacement of LMV431BCM5?
All LMV431BCM5 units undergo pre-shipment inspection (PSI). If there is an issue with LMV431BCM5, 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 part is unused and in its original packaging.
Return procedure for LMV431BCM5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431BCM5 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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