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Texas Instruments LMV431CZ/NOPB
- Part No.:
- LMV431CZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LMV431CZ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,901
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Product details
Overview
LMV431CZ/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. It serves as an error amplifier in 3-V off-line switching regulators and low-dropout shunt references.
For engineers reviewing the LMV431CZ/NOPB datasheet, LMV431CZ/NOPB pinout, LMV431CZ/NOPB application, or LMV431CZ/NOPB equivalent, key selection criteria include reference voltage accuracy over temperature, low operating current for battery-sensitive designs, stable operation with capacitive loads ≥10 nF, and compatibility with standard TO-92 PCB footprints and thermal derating curves.
Technical Context
The LMV431CZ/NOPB implements a band-gap reference core with negative feedback from cathode to adjust pin, functioning like a non-inverting op amp where the two-resistor divider sets gain. Its internal architecture enables precise voltage control without requiring external compensation across its full 1.24–30 V output range.
It operates over −40°C to +85°C (industrial grade), supports continuous cathode currents from −30 mA to +30 mA, and maintains regulation down to 55 µA cathode current-enabling use in ultra-low-power monitoring circuits and high-impedance bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal at 25°C; ±0.5% initial tolerance (LMV431B grade) ensures tight setpoint accuracy in feedback loops. |
| Temperature Coefficient | 39 ppm/°C (LMV431AI/B variants); guarantees ≤12 mV total drift over −40°C to +85°C for stable long-term regulation. |
| Dynamic Output Impedance | 0.25 Ω typical; provides low-impedance reference node critical for noise rejection and loop stability in error amplifiers. |
| Minimum Cathode Current | 55 µA; enables reliable regulation in high-value resistor-divider configurations and low-quiescent-current applications. |
| Operating Current | 55 µA typical quiescent current; reduces power loss in always-on voltage monitors and battery-backed systems. |
| Cathode Voltage Range | 1.24 V to 30 V; supports wide-range programmable shunt regulation without external op amps or transistors. |
Pinout & Package
LMV431CZ/NOPB uses the 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 path to ground | Connects to system ground; carries full cathode current minus reference input current (≤0.5 µA). |
| Cathode | Regulated output node | Delivers precise voltage set by R1/R2 divider; must be connected to supply rail or feedback point of downstream regulator. |
| Adjust | Reference input / feedback sense | High-impedance input (≤0.5 µA) that samples divided cathode voltage; determines regulation point via external resistive divider. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24-V reference enables regulation in 1.8-V and 3-V systems where traditional Zeners fail. |
| Industrial temperature range | −40°C to +85°C operation supports deployment in automotive cabin electronics and industrial PLC I/O modules. |
| Capacitive load stability | Stable with 10 nF to 50 pF loads-simplifies filtering in voltage monitor and crowbar circuits without phase-compensation networks. |
| Fast turn-on response | Enables rapid detection and clamping in overvoltage protection circuits with sub-microsecond latency. |
| Low-cost precision reference | Replaces discrete Zener+op-amp solutions with single-component, factory-trimmed accuracy and guaranteed tempco. |
Applications
| 3-V Off-Line Switching Regulator | Overvoltage/Undervoltage Protection |
|---|---|
Use Scenario: Feedback sensing in primary-side controlled AC/DC 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 modulate PWM duty cycle. Use Value: Enables compact, low-BOM-count isolated power supplies with <±1% output regulation across line/load/temperature. |
Use Scenario: Dual-threshold detection for microcontroller reset assertion when supply drops below 2.7 V or rises above 3.3 V. IC Role / Device Role / Timing Role: Precision voltage comparator with hysteresis implemented via resistor network on adjust pin. Use Value: Eliminates need for dedicated supervisor ICs; achieves ±10 mV threshold accuracy with passive components only. |
| Low-Dropout Shunt Regulator | Constant Current Sink |
Use Scenario: Generating stable 2.5-V bias for analog sensors in space-constrained IoT nodes powered by coin cells. IC Role / Device Role / Timing Role: Adjustable shunt regulator sinking excess current to maintain fixed voltage across load. Use Value: Achieves <100 mV dropout at 1 mA load with 55 µA quiescent current-extending battery life beyond 5 years. |
Use Scenario: LED biasing in automotive interior lighting where current must remain stable across 9–16 V battery variations. IC Role / Device Role / Timing Role: Two-terminal current source using cathode-anode path with fixed reference voltage and sense resistor. Use Value: Delivers ±2% current accuracy over temperature without active current mirrors or op-amp feedback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACZ | 2.495-V nominal reference; ±1% initial tolerance; higher 60-µA min cathode current; TO-92 package. | Requires different resistor divider for same output voltage; less suitable for sub-2.5-V systems. | Choose TL431ACZ when legacy 2.5-V reference compatibility is required and tighter 1.24-V accuracy is unnecessary. |
| LM4040CIM3-ADJ | Shunt voltage reference with 1.235-V nominal; ±0.5% tolerance; 60-µA max quiescent current; SOT-23-3 package. | No adjust pin-fixed reference only; lacks programmability and cathode voltage scaling capability. | Choose LM4040CIM3-ADJ only for simple fixed-reference needs where external resistor programming is not required. |
Compared with TL431ACZ and LM4040CIM3-ADJ, LMV431CZ/NOPB uniquely combines 1.24-V low-voltage operation, adjustable output up to 30 V, and TO-92 compatibility-making it optimal for modern low-voltage power management and precision monitoring where flexibility and footprint constraints matter.
Availability
LMV431CZ/NOPB is available at Aetrix Electronics and suitable for 3-V off-line switching regulators, overvoltage protection circuits, low-dropout shunt regulators, and constant-current sink designs requiring stable component supply and industrial-grade temperature performance.
Supply support for LMV431CZ/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 designed specifically for low-voltage, high-accuracy shunt regulation in cost-sensitive, space-constrained applications-including consumer power adapters, industrial sensor interfaces, and automotive body electronics.
FAQ
What is the reference voltage accuracy of LMV431CZ/NOPB over temperature?
The LMV431CZ/NOPB (LMV431B grade) exhibits ±0.5% initial tolerance at 25°C and a maximum deviation of ±12 mV over the full −40°C to +85°C industrial temperature range, corresponding to a 39 ppm/°C average temperature coefficient. This is verified per LMV431BI electrical characteristics table in the official TI datasheet SNVS041G.
Can LMV431CZ/NOPB operate with capacitive loads?
Yes, LMV431CZ/NOPB is stable with capacitive loads between 10 nF and 50 pF, as confirmed in the "Stability Boundary Condition" figure (Figure 19) and Applications section of the TI datasheet. Loads outside this range may cause oscillation unless compensated with series resistance or ferrite beads.
What is the minimum cathode current required for regulation in LMV431CZ/NOPB?
The LMV431CZ/NOPB requires a minimum cathode current of 55 µA to maintain regulation, as specified in the LMV431BC/LMV431BI Electrical Characteristics tables (Section 7.9–7.10). Below this threshold, the device exits regulation and cathode voltage drops below the programmed setpoint.
How does the adjust pin function in LMV431CZ/NOPB?
The adjust pin is a high-impedance reference input (max 0.5 µA leakage) that senses a fraction of the cathode voltage via an external resistor divider. When the voltage at the adjust pin equals the internal 1.24-V band-gap reference, the device regulates the cathode voltage to maintain that ratio-enabling precise programmable output from 1.24 V to 30 V.
Is LMV431CZ/NOPB RoHS compliant and lead-free?
Yes, LMV431CZ/NOPB is RoHS compliant and features 100% matte tin (Sn) lead finish, as documented in TI's Packaging Information table (Orderable Addendum). The "NOPB" suffix explicitly denotes lead-free packaging per JEDEC J-STD-609.
LMV431CZ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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:
- ±1.5%
- 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
LMV431CZ/NOPB FAQ
1.How can I place an order for LMV431CZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431CZ/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 LMV431CZ/NOPB reliable?
The price and inventory of LMV431CZ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431CZ/NOPB is usually 5 days.
3.What payment methods are accepted for LMV431CZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431CZ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431CZ/NOPB?
LMV431CZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431CZ/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 LMV431CZ/NOPB?
For technical support, including LMV431CZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431CZ/NOPB requirements.
6.How does Aetrix verify that LMV431CZ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV431CZ/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 LMV431CZ/NOPB meets industry standards.
7.What is the process for return or replacement of LMV431CZ/NOPB?
All LMV431CZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV431CZ/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 LMV431CZ/NOPB part is unused and in its original packaging.
Return procedure for LMV431CZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431CZ/NOPB Tags
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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