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Texas Instruments LMV431IM5/NOPB
- Part No.:
- LMV431IM5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431IM5/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:20,101
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Product details
Overview
LMV431IM5/NOPB from Texas Instruments is a precision 1.24-V adjustable shunt regulator in SOT-23-5 package, designed for low-voltage feedback control in voltage regulation, error amplification, and voltage monitoring circuits. It delivers 0.5% initial reference tolerance (LMV431B grade), 39 ppm/°C temperature coefficient, 55 µA minimum cathode current, and 0.25 Ω dynamic output impedance - enabling stable operation in 3-V off-line switching regulators and low-dropout shunt configurations.
For engineers reviewing the LMV431IM5/NOPB datasheet, LMV431IM5/NOPB pinout, LMV431IM5/NOPB application, or LMV431IM5/NOPB equivalent, key selection criteria include industrial-grade temperature range (−40°C to +85°C), SOT-23-5 thermal performance (RθJA = 455°C/W), capacitive stability (1 pF to 10 kΩ load), and compatibility with two-resistor external programming for adjustable output from 1.24 V to 30 V.
Technical Context
The LMV431IM5/NOPB implements a band-gap reference core with internal op-amp-like feedback architecture: cathode voltage is regulated via negative feedback from cathode to adjust pin, forming a programmable shunt with gain set by external R1/R2 divider. Its reference input current remains ultra-low (≤0.5 µA typ) across temperature, minimizing divider loading error.
It operates as a 3-terminal programmable Zener replacement, requiring no external compensation for stability with capacitive loads ≥1 pF and ≤10 nF. The device's fast turn-on response and low output impedance support dynamic regulation in switched-mode power supply error amplifiers and overvoltage protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% (typical 1.24 V, min/max 1.234–1.246 V at 25°C) - sets precise regulation threshold for feedback loops |
| Tempco | 39 ppm/°C - ensures <±6 mV deviation over −40°C to +85°C industrial range |
| Min Cathode Current | 55 µA - minimum current required to maintain regulation; enables low-power biasing |
| Dynamic Output Impedance | 0.25 Ω - maintains tight voltage regulation under load transients |
| Operating Temp Range | −40°C to +85°C - qualified for industrial environments without derating |
| Cathode Voltage Range | 1.24 V to 30 V - supports wide-output programmability using external resistors |
| Reference Input Current | 0.15–0.5 µA - minimizes resistor-divider power loss and voltage error |
Pinout & Package
SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed pad not connected. Pin 1 is not internally connected; Pin 2 is internally tied to Anode and must be left floating or connected to Anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connect (NC) | Unbonded die pad - must remain unconnected on PCB |
| Pin 2 | Anode | Internal connection to Anode terminal; optional external tie for layout flexibility |
| Pin 3 | Cathode | Regulated output node; sinks current to maintain programmed voltage |
| Pin 4 | Adjust | Feedback input; connects to resistor divider midpoint for voltage programming |
| Pin 5 | Anode | Main anode terminal; connects to ground or return path in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24-V fixed reference enables regulation below 2 V - critical for 3-V and battery-powered systems |
| 0.5% initial tolerance | Reduces need for post-manufacturing calibration in precision feedback paths |
| Stable with 1 pF–10 nF capacitive loads | Eliminates need for external compensation in most SMPS error amplifier designs |
| 55 µA regulation threshold | Supports ultra-low-quiescent-current applications such as always-on voltage monitors |
| Industrial temperature range | Guaranteed performance from −40°C to +85°C without derating or external thermal management |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
Use Scenario: Provides precise 3.3-V rail regulation in low-power microcontroller systems where input varies between 3.6 V and 5 V. IC Role / Device Role / Timing Role: Adjustable shunt regulator acting as voltage-controlled current sink to clamp output voltage. Use Value: Achieves ±1% output accuracy with only two external resistors and no inductor - reducing BOM count and board space. | Use Scenario: Controls base drive of N-channel MOSFET in linear series regulator for noise-sensitive analog supplies. IC Role / Device Role / Timing Role: Error amplifier comparing output voltage against 1.24-V reference to modulate pass transistor conduction. Use Value: Enables sub-10-mV load regulation and <10 µV RMS output noise due to low reference drift and high PSRR. |
| Voltage Monitor | Error Amplifier |
Use Scenario: Detects overvoltage condition (>5.5 V) in USB-powered peripherals to trigger shutdown logic. IC Role / Device Role / Timing Role: Programmable threshold detector using hysteresis-capable resistor network on Adjust pin. Use Value: Delivers 50-mV trip accuracy over temperature with no external comparator required. | Use Scenario: Compensates feedback loop of 3-V flyback converter to stabilize output under variable load and line conditions. IC Role / Device Role / Timing Role: Primary error amplifier in optocoupler-isolated secondary-side feedback path. Use Value: Maintains loop stability with >60° phase margin up to 1 MHz due to inherent bandwidth and low output impedance. |
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, 1.24-V reference, SOT-23-5, but rated for 0°C to 70°C commercial range only | Limited to non-industrial ambient environments; lower max cathode voltage (20 V vs. 30 V) | Select when cost sensitivity outweighs extended temperature or voltage range requirements |
| AS431ARTDT-33 | 1% initial tolerance, 1.24-V reference, SOT-23-5, −40°C to +85°C, but higher reference input current (1 µA typ) | Higher divider current increases power loss and reduces accuracy in high-R divider networks | Choose for cost-constrained industrial designs where ±1% reference accuracy is acceptable |
Compared with TLVH431ACDBVR and AS431ARTDT-33, LMV431IM5/NOPB offers superior temperature stability (39 ppm/°C vs. 50–100 ppm/°C), wider cathode voltage range (30 V), and lower reference input current - making it optimal for precision industrial power supervision and isolated SMPS feedback.
Availability
LMV431IM5/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded voltage monitoring, and isolated DC-DC converter feedback loops requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LMV431IM5/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, with over 90 years of innovation in precision analog ICs and power management.
The LMV431 family was engineered specifically for low-voltage, high-accuracy shunt regulation in space-constrained industrial and consumer power systems - emphasizing programmability, thermal stability, and ease of integration into feedback networks.
FAQ
What is the operating temperature range for LMV431IM5/NOPB?
The LMV431IM5/NOPB is rated for industrial operation from −40°C to +85°C. This range is guaranteed per its LMV431AI grade specification, with full electrical characteristics validated across this span - including reference voltage deviation ≤20 mV and reference input current drift ≤0.4 µA. LMV431IM5/NOPB maintains regulation stability without derating within this envelope.
Can LMV431IM5/NOPB replace a standard Zener diode?
Yes, LMV431IM5/NOPB functions as a precision programmable Zener: cathode-to-anode behaves like a 1.24-V Zener with externally adjustable breakdown (1.24 V to 30 V). Unlike passive Zeners, it offers 0.5% tolerance, low tempco (39 ppm/°C), and stable operation with capacitive loads - making LMV431IM5/NOPB ideal for replacing 1N47xx-series Zeners in feedback, clamping, or voltage reference roles.
What is the minimum cathode current needed for regulation in LMV431IM5/NOPB?
The LMV431IM5/NOPB requires a minimum cathode current of 55 µA to maintain regulation, per its LMV431BI electrical characteristics table. Below this threshold, reference voltage accuracy degrades significantly. This low IZ(MIN) enables use in ultra-low-power voltage monitors and bias networks where current budgets are constrained - a key advantage over older shunt references requiring >1 mA.
How does LMV431IM5/NOPB achieve stability with capacitive loads?
LMV431IM5/NOPB achieves intrinsic stability with capacitive loads from 1 pF to 10 nF due to its internal compensation and low output impedance (0.25 Ω). The device's open-loop gain and phase response are designed to avoid peaking or oscillation in typical feedback configurations - eliminating need for external compensation components in most shunt or error amplifier applications using LMV431IM5/NOPB.
Is LMV431IM5/NOPB pin-compatible with other LMV431 variants?
LMV431IM5/NOPB (SOT-23-5) shares identical pinout with LMV431ACM5/NOPB and LMV431BCM5/NOPB, all using DBV package with Pin 1 NC, Pin 2 Anode-connected, Pins 3–5 as Cathode/Adjust/Anode. However, tolerance grade (A/I/B) and temperature range differ - LMV431IM5/NOPB is AI-grade (−40°C to +85°C, 0.5% tolerance), so direct substitution requires verification of system-level accuracy and thermal requirements.
LMV431IM5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMV431IM5/NOPB FAQ
1.How can I place an order for LMV431IM5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431IM5/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 LMV431IM5/NOPB reliable?
The price and inventory of LMV431IM5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431IM5/NOPB is usually 5 days.
3.What payment methods are accepted for LMV431IM5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431IM5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431IM5/NOPB?
LMV431IM5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431IM5/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 LMV431IM5/NOPB?
For technical support, including LMV431IM5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431IM5/NOPB requirements.
6.How does Aetrix verify that LMV431IM5/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV431IM5/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 LMV431IM5/NOPB meets industry standards.
7.What is the process for return or replacement of LMV431IM5/NOPB?
All LMV431IM5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV431IM5/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 LMV431IM5/NOPB part is unused and in its original packaging.
Return procedure for LMV431IM5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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