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Texas Instruments LMV431IZ/NOPB
- Part No.:
- LMV431IZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LMV431IZ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,593
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Product details
Overview
LMV431IZ/NOPB from Texas Instruments is a precision 1.24-V adjustable shunt regulator in TO-92 package, supporting cathode voltage adjustment from 1.24 V to 30 V via external resistor divider. It delivers 0.5% initial tolerance (LMV431B grade), 39 ppm/°C temperature coefficient, 55 µA minimum regulation current, and 0.25 Ω dynamic output impedance - enabling stable low-voltage error amplification in 3-V offline switching regulators.
For engineers reviewing the LMV431IZ/NOPB datasheet, LMV431IZ/NOPB pinout, LMV431IZ/NOPB application, or LMV431IZ/NOPB equivalent, key selection criteria include its industrial-grade temperature range (−40°C to +85°C), TO-92 thermal performance (161°C/W junction-to-ambient), capacitive load stability (1 pF to 10 kΩ), and compatibility with zener-replacement topologies requiring sub-2-V reference accuracy.
Technical Context
The LMV431IZ/NOPB operates as a two-terminal adjustable shunt regulator with internal bandgap reference and op-amp-like feedback control: cathode voltage is regulated by negative feedback from cathode to adjust pin. Its functional diagram shows a high-gain transconductance amplifier driving an NPN pass transistor, with reference input current ≤0.5 µA and off-state cathode leakage <0.1 µA at 6 V.
It achieves fast turn-on response and stable operation with capacitive loads ≥1 pF and ≤10 nF, and supports three primary configurations: voltage follower (cathode-to-adjust short), adjustable shunt regulator (two-resistor divider), and error amplifier in series/switching regulator feedback loops - all without requiring external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal (±0.5% for LMV431B grade); sets precise low-voltage threshold for regulation and monitoring. |
| Tempco | 39 ppm/°C; ensures <±6 mV total drift over −40°C to +85°C for stable feedback in industrial environments. |
| Min Cathode Current | 55 µA; enables regulation at ultra-low power, critical for battery-backed or energy-harvesting systems. |
| Dynamic Output Impedance | 0.25 Ω; provides tight voltage regulation under dynamic load steps in shunt-based error amplifiers. |
| Cathode Voltage Range | 1.24 V to 30 V; supports wide-output adjustable regulation without external op-amps or level-shifting circuitry. |
| Operating Temp Range | −40°C to +85°C; qualified for industrial ambient conditions without derating in TO-92 package. |
| Capacitive Load Stability | Stable with 1 pF–10 nF; eliminates need for series resistance or compensation networks in most applications. |
Pinout & Package
LMV431IZ/NOPB uses TO-92 (LP) plastic package (4.30 mm × 4.30 mm body), rated for 0.78 W internal power dissipation at 25°C with 161°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink terminal | Connected to system ground or low-side return path; carries full cathode current minus reference input current. |
| Cathode | Regulated output terminal | Delivers precisely controlled voltage; connects to feedback node of switching regulator or shunt load. |
| Adjust | Reference input node | High-impedance (≤0.5 µA) input that senses divided cathode voltage; determines regulated setpoint via R1/R2 divider. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24-V reference enables regulation in 1.8-V, 2.5-V, and 3-V systems where standard zeners fail. |
| 0.5% initial tolerance | Reduces component count in precision feedback loops by eliminating trim pots or calibration steps. |
| Low operating current | 55 µA min cathode current allows use in micropower designs with <100 µA total quiescent budget. |
| Low output impedance | 0.25 Ω dynamic impedance maintains ±10 mV regulation across 10-mA load transients. |
| Fast turn-on response | Enables rapid fault detection and crowbar activation in overvoltage protection circuits. |
Applications
| 3-V Off-Line Switching Regulator | Overvoltage/Undervoltage Protection |
|---|---|
Use Scenario: Feedback sensing in isolated flyback converters powered from rectified 3-V AC input. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler-coupled secondary-side feedback loop. Use Value: Enables ±1% output regulation across line/load/temperature using only two external resistors and no trimming. | Use Scenario: Dual-threshold monitoring of 5-V rail in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Adjustable voltage comparator with hysteresis via resistor network and LED indicator drive. Use Value: Detects faults within ±25 mV window using single device, reducing BOM vs. dual-op-amp solutions. |
| Voltage Monitor | Low Dropout N-Channel Series Regulator |
Use Scenario: Battery voltage supervision in portable medical devices with Li-ion (2.7–4.2 V) supply. IC Role / Device Role / Timing Role: Reference element in high-impedance resistive divider feeding comparator input. Use Value: Draws <0.5 µA reference current, extending battery life >10 years in sleep mode. | Use Scenario: Post-regulation of 3.3-V LDO output to generate stable 2.5-V analog supply. IC Role / Device Role / Timing Role: Shunt-controlled gate driver for external N-channel MOSFET in series-pass configuration. Use Value: Achieves <100 mV dropout at 100 mA with <1% output variation, replacing fixed-LDO ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACZ | 1.24-V reference, 0.5% tolerance, but SOT-23-3 package and 60 µA min cathode current. | Limited to surface-mount layouts; lower thermal mass reduces TO-92's 0.78-W dissipation capability. | Select when PCB space is constrained and thermal load <300 mW. |
| LM4040CIM3-ADJ | Adjustable 1.235–10 V reference, 0.5% tolerance, but fixed 60-µA operating current and no shunt regulation capability. | Requires external pass transistor for shunt function; adds complexity in crowbar or series-regulator roles. | Select only for pure reference buffering; not drop-in for LMV431IZ/NOPB shunt topologies. |
Compared with TLVH431ACZ and LM4040CIM3-ADJ, LMV431IZ/NOPB uniquely combines TO-92 thermal robustness, true shunt regulation without external transistors, and guaranteed 55 µA min cathode current - making it optimal for high-reliability industrial feedback and protection circuits where through-hole mounting and power handling are required.
Availability
LMV431IZ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded voltage monitors, and overvoltage protection circuits requiring stable component supply with long lifecycle support.
Supply support for LMV431IZ/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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LMV431 family was designed specifically for low-voltage, high-precision shunt regulation - replacing zener diodes in feedback paths of switching regulators, voltage monitors, and current sources where 1.24-V reference accuracy and industrial temperature operation are essential.
FAQ
What is the maximum cathode voltage supported by LMV431IZ/NOPB?
The LMV431IZ/NOPB supports a cathode voltage up to 35 V absolute maximum, with recommended operation up to 30 V. This allows safe use in 24-V industrial systems and 30-V switching regulator outputs while maintaining regulation integrity and thermal safety in the TO-92 package.
Can LMV431IZ/NOPB replace a standard zener diode in existing designs?
Yes, LMV431IZ/NOPB can directly replace zener diodes in shunt regulator and voltage reference applications. Its 1.24-V base reference, adjustable range (1.24–30 V), and low dynamic impedance (0.25 Ω) provide superior accuracy, temperature stability, and load regulation compared to discrete zeners - especially below 3.3 V.
What is the minimum cathode current required for regulation in LMV431IZ/NOPB?
The LMV431IZ/NOPB requires a minimum cathode current of 55 µA to maintain regulation, as specified in the LMV431BI electrical characteristics table. This ultra-low requirement enables reliable operation in micropower systems such as battery-backed sensors and energy-harvesting nodes where current budgets are tightly constrained.
How does the TO-92 package affect thermal performance of LMV431IZ/NOPB?
The TO-92 package gives LMV431IZ/NOPB a junction-to-ambient thermal resistance of 161°C/W, enabling 0.78 W power dissipation at 25°C ambient. This exceeds SOT-23 variants (0.28 W), making it suitable for higher-power shunt applications like crowbar circuits and linear post-regulators where heat sinking is impractical.
Is LMV431IZ/NOPB stable with ceramic capacitive loads?
Yes, LMV431IZ/NOPB is stable with ceramic capacitive loads ranging from 1 pF to 10 nF, as confirmed in Figure 19 (Stability Boundary Condition) of the datasheet. This eliminates the need for series damping resistors or tantalum alternatives - simplifying layout and improving transient response in voltage monitor and error amplifier applications.
LMV431IZ/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:
- ±1.5%
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LMV431IZ/NOPB FAQ
1.How can I place an order for LMV431IZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431IZ/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 LMV431IZ/NOPB reliable?
The price and inventory of LMV431IZ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431IZ/NOPB is usually 5 days.
3.What payment methods are accepted for LMV431IZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431IZ/NOPB transactions.
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4.How is shipping managed for LMV431IZ/NOPB?
LMV431IZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431IZ/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 LMV431IZ/NOPB?
For technical support, including LMV431IZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431IZ/NOPB requirements.
6.How does Aetrix verify that LMV431IZ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV431IZ/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 LMV431IZ/NOPB meets industry standards.
7.What is the process for return or replacement of LMV431IZ/NOPB?
All LMV431IZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV431IZ/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 LMV431IZ/NOPB part is unused and in its original packaging.
Return procedure for LMV431IZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431IZ/NOPB Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4040CYM3-2.5-TR
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LM4040D20IDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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