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Texas Instruments LMV431AIZ/NOPB
- Part No.:
- LMV431AIZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LMV431AIZ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,749
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Product details
Overview
LMV431AIZ/NOPB from Texas Instruments is a precision 1.24-V adjustable shunt regulator in TO-92 package, designed for low-voltage regulation down to 2.7 V with ±0.5% initial reference voltage tolerance, 39 ppm/°C temperature coefficient, and 0.25 Ω dynamic output impedance. It functions as a programmable voltage reference or error amplifier in feedback loops of switching regulators and voltage monitors.
For engineers reviewing the LMV431AIZ/NOPB datasheet, LMV431AIZ/NOPB pinout, LMV431AIZ/NOPB application, or LMV431AIZ/NOPB equivalent, key selection criteria include its industrial-grade (−40°C to +85°C) operation, low 55 µA minimum cathode current requirement, stability with capacitive loads from 1 pF to 10 kΩ, and compatibility with two-resistor external programming for adjustable output from 1.24 V to 30 V.
Technical Context
The LMV431AIZ/NOPB implements a band-gap reference core with negative feedback via the adjust (REF) pin, enabling precise cathode voltage control analogous to a non-inverting op-amp configuration. Its internal architecture supports stable operation across wide cathode voltage (1.24 V–30 V) and current (0.1 mA–15 mA) ranges.
It delivers temperature-compensated reference performance with 39 ppm/°C drift over −40°C to +85°C, achieves fast turn-on response, and maintains low output impedance (0.25 Ω) under load - critical for high-accuracy error amplification and voltage detection in power management circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal at 25°C; ±0.5% initial tolerance ensures tight setpoint accuracy for feedback networks. |
| Tempco | 39 ppm/°C over −40°C to +85°C; enables stable regulation without external compensation in industrial environments. |
| Min Cathode Current | 55 µA; allows reliable regulation even in ultra-low-power applications like battery-backed voltage monitors. |
| Dynamic Output Impedance | 0.25 Ω; minimizes output voltage deviation under varying load conditions in shunt or series regulator topologies. |
| Cathode Voltage Range | 1.24 V to 30 V; supports wide-range programmability using two external resistors (R1/R2) per standard shunt regulator equation. |
| Stable Capacitive Load | 1 pF to 10 kΩ; accommodates common ceramic and electrolytic output capacitors without oscillation in crowbar or LDO assist circuits. |
Pinout & Package
LMV431AIZ/NOPB uses the TO-92 plastic package (4.30 mm × 4.30 mm), with three leads: Anode (pin 1), Cathode (pin 2), and Reference/Adjust (pin 3). Pin 1 is internally connected to Anode; pin 2 is Cathode; pin 3 is REF. Pin 1 must be connected to Anode node or left floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current return path | Internally tied to device ground; connects to system GND or low-side return in shunt configurations. |
| Cathode (Pin 2) | Regulated output node | Delivers programmed voltage; sinks current into external load or feedback network of upstream regulator. |
| Reference (Pin 3) | Feedback input | Senses divided output voltage; controls cathode voltage via internal amplifier to maintain 1.24 V across R1–R2 divider. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 2.7 V–3.3 V systems where traditional Zeners fail. |
| Industrial temperature range | Rated for −40°C to +85°C operation, supporting embedded control and automotive body electronics. |
| Low quiescent current | 55 µA minimum cathode current allows use in always-on monitoring circuits without significant standby drain. |
| Fast turn-on response | Enables rapid fault detection and protection activation in overvoltage crowbar circuits. |
| Low output impedance | 0.25 Ω dynamic impedance ensures minimal voltage droop during transient load steps in precision references. |
Applications
| Overvoltage Protection | Voltage Monitor |
|---|---|
Use Scenario: Detects when a 5 V rail exceeds 5.5 V and triggers a thyristor-based crowbar to short the supply. IC Role / Device Role / Timing Role: Precision voltage comparator with adjustable threshold via R1/R2 divider on REF pin. Use Value: 0.5% reference tolerance ensures accurate trip point; 39 ppm/°C tempco prevents thermal drift-induced false triggering. | Use Scenario: Monitors battery voltage in a portable medical device to warn at 3.2 V and shut down at 2.9 V. IC Role / Device Role / Timing Role: Dual-threshold detector using two LMV431AIZ/NOPB units with independent resistor dividers. Use Value: Low 55 µA operating current extends battery life; TO-92 package simplifies manual assembly in low-volume diagnostics equipment. |
| 3-V Off-Line Switching Regulator | Low Dropout N-Channel Series Regulator |
Use Scenario: Provides error amplification in the feedback loop of a 3 V-input flyback converter powering isolated I/O modules. IC Role / Device Role / Timing Role: High-gain shunt reference replacing optocoupler secondary-side sensing in cost-sensitive AC/DC designs. Use Value: 0.25 Ω output impedance improves loop stability; wide 1.24–30 V adjustment range supports multiple output voltages from one BOM. | Use Scenario: Controls gate of an N-channel MOSFET to regulate 2.8 V output from a 3.3 V source in a noise-sensitive sensor signal chain. IC Role / Device Role / Timing Role: Adjustable reference driving MOSFET gate via op-amp buffer to achieve sub-100 mV dropout. Use Value: 1.24 V reference enables precise 2.8 V setpoint; TO-92 mechanical robustness suits industrial PCB layouts with vibration exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACZ | Higher 2.495 V reference, ±2% initial tolerance, wider 2.5–36 V adjustment range, higher 1 mA min cathode current. | Requires redesign of resistor divider; less suitable for sub-3 V systems due to higher reference voltage. | Choose TL431ACZ only if existing design uses 2.5 V reference or requires higher voltage headroom. |
| LM4040CIM3-ADJ | Fixed 1.2 V or 2.048 V variants; no adjustable version; 0.5% tolerance, 75 ppm/°C tempco, SOT-23-3 package. | Lacks external resistor programming; limited to fixed-output configurations; smaller footprint but no voltage flexibility. | Select LM4040CIM3-ADJ only for space-constrained designs needing fixed reference without adjustment. |
Compared with TL431ACZ and LM4040CIM3-ADJ, LMV431AIZ/NOPB uniquely combines 1.24 V low-voltage reference, 0.5% tolerance, TO-92 through-hole compatibility, and 55 µA regulation threshold - making it optimal for cost-sensitive, low-power, industrial-grade shunt regulation where voltage adjustability below 3 V is essential.
Availability
LMV431AIZ/NOPB is available at Aetrix Electronics and suitable for overvoltage protection, voltage monitoring, 3-V off-line switching regulators, and low-dropout N-channel series regulators requiring stable component supply across industrial temperature ranges.
Supply support for LMV431AIZ/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 reference and power management ICs.
The LMV431 family was engineered specifically for low-voltage, high-accuracy shunt regulation in cost-sensitive industrial and consumer power systems - emphasizing programmability, thermal stability, and ease of integration into legacy through-hole designs.
FAQ
What is the reference voltage tolerance of LMV431AIZ/NOPB at 25°C?
The LMV431AIZ/NOPB has a ±0.5% initial reference voltage tolerance at 25°C, meaning its 1.24 V band-gap reference falls between 1.234 V and 1.246 V under nominal conditions. This tight tolerance is confirmed in the LMV431BC/LMV431BI electrical characteristics tables and directly supports high-accuracy feedback in precision power supplies. LMV431AIZ/NOPB maintains this specification across its rated industrial temperature range.
Can LMV431AIZ/NOPB operate with a 2.7 V supply?
Yes, LMV431AIZ/NOPB can regulate from a 2.7 V supply when configured as a shunt regulator with appropriate external resistors, since its minimum cathode voltage is 1.24 V and it requires only 55 µA minimum cathode current. The device remains stable with capacitive loads ≥1 pF, making it viable for low-dropout applications such as 3 V-to-2.7 V LDO assist circuits. LMV431AIZ/NOPB's low-voltage capability is explicitly cited in TI's official description.
What is the maximum cathode voltage rating for LMV431AIZ/NOPB?
The absolute maximum cathode voltage for LMV431AIZ/NOPB is 35 V, with recommended operation up to 30 V. This limit is defined in Section 7.1 (Absolute Maximum Ratings) of the SNVS041G datasheet. Exceeding 30 V in normal operation risks violating recommended conditions, while sustained operation above 35 V may cause permanent damage. LMV431AIZ/NOPB's 30 V upper limit supports use in 24 V industrial bus monitoring and flyback auxiliary windings.
Does LMV431AIZ/NOPB require an external capacitor for stability?
No, LMV431AIZ/NOPB does not require an external capacitor for basic stability - it is inherently stable with capacitive loads from 1 pF to 10 kΩ, as verified in Figure 19 (Stability Boundary Condition) of the datasheet. However, adding a small ceramic capacitor (e.g., 10 nF) at the cathode improves transient response in fast-switching applications. LMV431AIZ/NOPB's wide stability range eliminates mandatory compensation components in most shunt regulator implementations.
What is the temperature coefficient of LMV431AIZ/NOPB?
The LMV431AIZ/NOPB has a temperature coefficient of 39 ppm/°C over the industrial range (−40°C to +85°C), as specified for the LMV431AI grade in Section 3 (Features) and Table 7.8. This value quantifies the average drift of the 1.24 V reference voltage per degree Celsius and ensures predictable, linear behavior in thermal cycling environments. LMV431AIZ/NOPB's 39 ppm/°C spec makes it suitable for applications where reference stability across temperature is critical, such as battery fuel gauging and sensor excitation.
LMV431AIZ/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%
- 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
LMV431AIZ/NOPB FAQ
1.How can I place an order for LMV431AIZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431AIZ/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 LMV431AIZ/NOPB reliable?
The price and inventory of LMV431AIZ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431AIZ/NOPB is usually 5 days.
3.What payment methods are accepted for LMV431AIZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431AIZ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431AIZ/NOPB?
LMV431AIZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431AIZ/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 LMV431AIZ/NOPB?
For technical support, including LMV431AIZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431AIZ/NOPB requirements.
6.How does Aetrix verify that LMV431AIZ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV431AIZ/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 LMV431AIZ/NOPB meets industry standards.
7.What is the process for return or replacement of LMV431AIZ/NOPB?
All LMV431AIZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV431AIZ/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 LMV431AIZ/NOPB part is unused and in its original packaging.
Return procedure for LMV431AIZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431AIZ/NOPB Tags
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TL431AIDBZR
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AZ431LANTR-G1
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