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Texas Instruments LMV431BCZ/NOPB
- Part No.:
- LMV431BCZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LMV431BCZ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,352
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Product details
Overview
LMV431BCZ/NOPB from Texas Instruments is a precision 1.24-V adjustable shunt regulator in TO-92 package, delivering 0.5% initial reference voltage tolerance (1.234 V to 1.246 V at 25°C), 55 µA minimum cathode current for regulation, 0.25 Ω dynamic output impedance, and stable operation with capacitive loads from 1 pF to 10 kΩ. It serves as an error amplifier in 3-V off-line switching regulators and voltage monitor in low-dropout power supplies.
For engineers reviewing the LMV431BCZ/NOPB datasheet, LMV431BCZ/NOPB pinout, LMV431BCZ/NOPB application, or LMV431BCZ/NOPB equivalent, key selection factors include its industrial-grade temperature range (−40°C to +85°C), low 39 ppm/°C temperature coefficient, compatibility with standard TO-92 PCB footprints, and functional equivalence to Zener diodes below 2.7 V while enabling precise voltage adjustment via external resistors.
Technical Context
The LMV431BCZ/NOPB implements a band-gap reference core with negative feedback from cathode to adjust pin, operating like a non-inverting op amp where the two-resistor divider sets gain. Its internal architecture enables programmable output from 1.24 V to 30 V using only R1 and R2 external components.
It achieves fast turn-on response and stability with capacitive loads ≥1 pF and ≤10 kΩ without requiring series resistance, supporting direct use in crowbar circuits, current sinks, and overvoltage protection schemes. The device draws only 55 µA quiescent current and maintains <12 mV reference deviation across its full operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.234 V to 1.246 V at 25°C; enables accurate 1.24-V baseline for feedback loops in low-voltage regulators. |
| Initial Tolerance | ±0.5% (LMV431B grade); reduces calibration overhead in precision voltage monitoring and error amplification. |
| Temperature Coefficient | 39 ppm/°C; ensures ≤6 mV total drift over −40°C to +85°C, critical for industrial sensor and power supply references. |
| Dynamic Output Impedance | 0.25 Ω typical; provides stiff voltage reference under load transients, minimizing regulation error in shunt configurations. |
| Minimum Cathode Current | 55 µA; allows stable regulation at ultra-low power, enabling use in battery-backed or energy-harvesting systems. |
| Operating Temperature | −40°C to +85°C; qualified for industrial environments including motor drives and PLC I/O modules. |
| Stable Capacitive Load Range | 1 pF to 10 kΩ; eliminates need for external compensation in most applications, simplifying layout and BOM. |
Pinout & Package
LMV431BCZ/NOPB uses the TO-92 plastic package (4.30 mm × 4.30 mm body), with three leads: Anode (pin 1), Cathode (pin 2), and Adjust (pin 3). Pin 1 is internally connected to Anode; pin 2 is Cathode; pin 3 is Adjust. No internal connection exists between pin 1 and pin 2 - they serve distinct terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Connects to system ground or return path; forms low-impedance reference point for internal band-gap circuit. |
| Cathode (Pin 2) | Output voltage node | Delivers regulated voltage; sinks current when reference condition is met; connects to feedback network or load. |
| Adjust (Pin 3) | Feedback input | Accepts resistor-divider voltage; controls cathode voltage via internal error amplifier; determines final setpoint (1.24 V × (1 + R1/R2)). |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24-V fixed reference baseline enables regulation down to 2.7 V input, ideal for single-cell Li-ion or 3.3-V systems. |
| Adjustable output range | Programmable from 1.24 V to 30 V using two external resistors - replaces multiple Zener diodes with one footprint. |
| Industrial temperature rating | Specified from −40°C to +85°C with 39 ppm/°C TC - meets requirements for factory automation and outdoor electronics. |
| Low quiescent current | 55 µA minimum cathode current supports micro-power designs; compatible with high-value feedback resistors (>1 MΩ). |
| Capacitive load stability | Stable with 1 pF–10 kΩ load capacitance - eliminates need for series damping resistors in voltage monitor or timer circuits. |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
|
Use Scenario: Providing stable 3.3-V rail from a noisy 5-V supply in an industrial sensor node. IC Role / Device Role / Timing Role: Shunt regulator clamping excess voltage by sinking current through cathode to maintain precise 3.3 V at adjust pin. Use Value: Replaces discrete Zener + transistor solution with ±0.5% accuracy and no thermal runaway risk. |
Use Scenario: Boosting regulation accuracy of a fixed 5-V LDO by adding external feedback control. IC Role / Device Role / Timing Role: Error amplifier comparing LDO output against 1.24-V reference, driving pass transistor gate. Use Value: Enables adjustable output (e.g., 4.8 V to 5.2 V) with <12 mV total drift over temperature. |
| Voltage Monitor | Overvoltage Protection |
|
Use Scenario: Detecting battery overcharge in a 3.7-V Li-ion pack before cell damage occurs. IC Role / Device Role / Timing Role: Reference comparator triggering cutoff when cell voltage exceeds 4.25 V via resistor divider. Use Value: Achieves 10-mV detection threshold resolution with 39 ppm/°C stability across operating range. |
Use Scenario: Activating a thyristor-based crowbar during DC bus overvoltage in a motor drive inverter. IC Role / Device Role / Timing Role: Fast-turn-on shunt element diverting fault current when bus exceeds 32 V. Use Value: Responds within microseconds with 55 µA regulation threshold, protecting downstream IGBTs. |
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, SOT-23-5 package, 1.24-V reference, but rated only for 0°C to 70°C commercial range. | Lacks industrial temperature support; unsuitable for −40°C cold-start or 85°C enclosure environments. | Select TLVH431ACDBVR only for cost-sensitive consumer applications with ambient <70°C. |
| AS431AT-E1 | 0.5% tolerance, TO-92 package, 1.24-V reference, but higher 100 µA min cathode current and 1.5 Ω output impedance. | Requires higher bias current and exhibits greater regulation error under load step changes. | Choose AS431AT-E1 only if LMV431BCZ/NOPB is unavailable and design can tolerate reduced transient performance. |
Compared with TLVH431ACDBVR and AS431AT-E1, LMV431BCZ/NOPB uniquely combines TO-92 mechanical compatibility, −40°C to +85°C operation, sub-0.3 Ω output impedance, and 55 µA regulation threshold - making it optimal for industrial shunt regulation where thermal robustness and precision coexist.
Availability
LMV431BCZ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and embedded voltage monitors requiring stable component supply with long-term lifecycle assurance.
Supply support for LMV431BCZ/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 focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability components.
The LMV431 family was designed specifically for low-voltage precision shunt regulation in space-constrained, thermally demanding applications - replacing Zener diodes with programmable, temperature-stable alternatives.
FAQ
What is the reference voltage tolerance of LMV431BCZ/NOPB at 25°C?
The LMV431BCZ/NOPB has a reference voltage tolerance of ±0.5% at 25°C, specified as 1.234 V to 1.246 V under 10 mA cathode current. This tight tolerance enables high-accuracy feedback in voltage regulators and monitors without trimming. The LMV431BCZ/NOPB maintains this precision across its full industrial temperature range with only 6 mV maximum deviation.
Can LMV431BCZ/NOPB replace a Zener diode in a 3.3-V shunt regulator?
Yes, LMV431BCZ/NOPB directly replaces Zener diodes in 3.3-V shunt regulators by configuring R1 and R2 to set VOUT = 1.24 V × (1 + R1/R2). Unlike Zeners, LMV431BCZ/NOPB offers 0.5% initial tolerance, 39 ppm/°C TC, and stable operation down to 55 µA cathode current - eliminating thermal drift and leakage issues common with discrete Zeners.
What is the minimum cathode current required for regulation in LMV431BCZ/NOPB?
The LMV431BCZ/NOPB requires a minimum cathode current of 55 µA to maintain regulation, per datasheet Section 7.9. This ultra-low threshold allows use with high-value feedback resistors (e.g., 1 MΩ) and supports micro-power designs such as battery-backed sensors. Below 55 µA, the device exits regulation and cathode voltage rises toward supply rail.
Does LMV431BCZ/NOPB support capacitive loads, and what is the stable range?
Yes, LMV431BCZ/NOPB is stable with capacitive loads from 1 pF up to 10 kΩ, as confirmed in Figure 19 of the SNVS041G datasheet. This wide range eliminates need for series damping resistors in applications like voltage monitors and delay timers. Stability holds across temperature and cathode voltage (2 V to 3 V), unlike many shunt references requiring careful CL selection.
What package type and pin configuration does LMV431BCZ/NOPB use?
LMV431BCZ/NOPB uses the TO-92 plastic package with three leads: Anode (pin 1), Cathode (pin 2), and Adjust (pin 3). Pin 1 connects internally to Anode; pin 2 is Cathode output; pin 3 is the feedback Adjust input. The marking "LMV431 AIZ" appears on the package body, consistent with TI's TO-92 ordering nomenclature for LMV431B-grade devices.
LMV431BCZ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Box
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LMV431BCZ/NOPB FAQ
1.How can I place an order for LMV431BCZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431BCZ/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 LMV431BCZ/NOPB reliable?
The price and inventory of LMV431BCZ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431BCZ/NOPB is usually 5 days.
3.What payment methods are accepted for LMV431BCZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431BCZ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431BCZ/NOPB?
LMV431BCZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431BCZ/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 LMV431BCZ/NOPB?
For technical support, including LMV431BCZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431BCZ/NOPB requirements.
6.How does Aetrix verify that LMV431BCZ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV431BCZ/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 LMV431BCZ/NOPB meets industry standards.
7.What is the process for return or replacement of LMV431BCZ/NOPB?
All LMV431BCZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV431BCZ/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 LMV431BCZ/NOPB part is unused and in its original packaging.
Return procedure for LMV431BCZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431BCZ/NOPB Tags
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