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Texas Instruments LMV431ACM5X
- Part No.:
- LMV431ACM5X
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431ACM5X.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,120
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Product details
Overview
LMV431ACM5X from Texas Instruments is a precision 1.24-V adjustable shunt regulator in SOT-23-5 package, designed for low-voltage (1.24 V to 30 V) feedback control in power management circuits. It delivers 0.5% initial reference voltage tolerance at 25°C, 55 µA minimum cathode current for regulation, and 0.25 Ω dynamic output impedance - enabling stable voltage monitoring and error amplification in 3-V off-line switching regulators and low-dropout series regulators.
For engineers reviewing the LMV431ACM5X datasheet, LMV431ACM5X pinout, LMV431ACM5X application, or LMV431ACM5X equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The LMV431ACM5X operates as a 3-terminal adjustable shunt regulator with internal band-gap reference and op-amp-like feedback architecture: cathode voltage is controlled by negative feedback from cathode to adjust pin. Its reference input current is ≤0.5 µA at 25°C, and it maintains regulation down to 55 µA cathode current - critical for low-power biasing and sensing applications.
It features temperature-compensated reference performance (39 ppm/°C typical), stable operation with capacitive loads from 1 pF to 10 kΩ, and fast turn-on response suitable for overvoltage protection and delay timer circuits. The device is rated for 0°C to 70°C commercial temperature range and supports cathode voltages up to 30 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal (1.228–1.252 V at 25°C); sets precise feedback threshold for shunt or series regulation. |
| Initial Tolerance | ±1% (LMV431AC grade); ensures accurate output voltage setting without calibration in production designs. |
| Temp Coefficient | 39 ppm/°C; enables stable reference across 0°C–70°C ambient without external compensation. |
| Min Cathode Current | 55 µA; defines lowest load current needed to maintain regulation - critical for ultra-low-power standby modes. |
| Dynamic Output Impedance | 0.25 Ω; provides tight voltage regulation under varying load conditions, reducing output ripple. |
| Reference Input Current | ≤0.5 µA at 25°C; minimizes divider resistor loading, enabling high-impedance feedback networks. |
| Cathode Voltage Range | 1.24 V to 30 V; supports wide-range output adjustment in both shunt and series configurations. |
Pinout & Package
SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed thermal pad (not electrically 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 | NC (No Connect) | Not bonded; must remain unconnected on PCB to avoid parasitic coupling or ESD path. |
| Pin 2 | Anode | Internally connected to Anode terminal; floating or tied to Anode node per layout guidance. |
| Pin 3 | Cathode | Main output terminal; sinks current to regulate voltage - connects to supply rail or feedback node. |
| Pin 4 | Adjust | Reference input; receives feedback voltage divider signal - controls cathode voltage via closed-loop gain. |
| Pin 5 | Anode | Primary anode connection; ties to ground or return path - forms current sink path with Cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 1.8 V–3.3 V systems where Zener diodes fail to conduct. |
| Stable with capacitive loads | Functional with 1 pF–10 kΩ capacitive loads - eliminates need for external compensation in most feedback loops. |
| Low quiescent current | 55 µA min cathode current allows use in battery-powered voltage monitors with multi-year shelf life. |
| Fast turn-on response | Enables sub-microsecond reaction in overvoltage crowbar and fault-detection circuits. |
| Industrial-grade temp stability | 39 ppm/°C TC and ±1% initial tolerance support reliable operation across full 0°C–70°C commercial range. |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
Use Scenario: Precision 3.3 V shunt reference in isolated DC-DC converter feedback loop. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing stable 3.3 V reference for optocoupler feedback. Use Value: Replaces discrete Zener + transistor combo with single IC, reducing BOM count and improving temperature drift performance. |
Use Scenario: Low-dropout N-channel series regulator for 2.7 V output from 3 V supply. IC Role / Device Role / Timing Role: Error amplifier controlling external pass FET to regulate output voltage. Use Value: Enables <100 mV dropout with 1.24 V reference, achieving higher efficiency than fixed LDOs in 3 V systems. |
| Voltage Monitor | Error Amplifier |
Use Scenario: Undervoltage lockout (UVLO) circuit triggering reset when 5 V rail drops below 4.75 V. IC Role / Device Role / Timing Role: Adjustable threshold detector using resistive divider on Adjust pin. Use Value: Provides programmable, temperature-stable trip point without external op-amp or comparator. |
Use Scenario: Feedback error amplifier in 3 V off-line flyback switching regulator. IC Role / Device Role / Timing Role: Compares sensed output voltage against 1.24 V reference to drive PWM controller. Use Value: Delivers <0.5 µA input bias current, minimizing divider loading and improving regulation accuracy vs. TL431. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Higher 2.495 V reference, ±2% initial tolerance, 100 µA min cathode current, 0.22 Ω rZ. | Requires higher minimum cathode current and different resistor scaling; less suitable for <2.5 V systems. | Select when existing 2.495 V feedback network exists and 1.24 V reference is unnecessary. |
| LMV431AIM5X | Same 1.24 V reference but industrial −40°C to +85°C rating, ±0.5% initial tolerance, 39 ppm/°C TC. | Validated for extended temperature environments; identical pinout and electrical behavior except temp range. | Choose for automotive or industrial deployments requiring wider operating temperature margin. |
Compared with TL431ACDBVR and LMV431AIM5X, the LMV431ACM5X offers optimal balance of low-voltage capability, commercial-temp cost efficiency, and minimal cathode current demand - making it ideal for consumer and computing power supplies where 1.24 V reference and 0°C–70°C operation suffice.
Availability
LMV431ACM5X is available at Aetrix Electronics and suitable for 3-V off-line switching regulators, low-dropout series regulators, and voltage monitor circuits requiring stable component supply with guaranteed long-term sourcing.
Supply support for LMV431ACM5X 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 developed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and low-power applications - targeting cost-sensitive consumer, computing, and industrial power systems.
FAQ
What is the reference voltage tolerance of LMV431ACM5X at 25°C?
The LMV431ACM5X has a reference voltage tolerance of ±1% at 25°C (1.228 V to 1.252 V), as specified in the LMV431AC Electrical Characteristics table. This tighter tolerance versus standard LMV431C (±1.5%) improves initial accuracy in uncalibrated power supply designs without increasing cost.
Can LMV431ACM5X replace a Zener diode in low-voltage applications?
Yes - the LMV431ACM5X replaces Zener diodes in applications below 2.5 V, where conventional Zeners exhibit poor regulation and high temperature drift. Its 1.24 V band-gap reference, 39 ppm/°C TC, and 0.25 Ω output impedance provide superior stability and accuracy compared to discrete Zener + transistor solutions.
What is the minimum cathode current required for regulation in LMV431ACM5X?
The LMV431ACM5X requires a minimum cathode current of 55 µA to maintain regulation, as confirmed in Section 7.7 (LMV431AC Electrical Characteristics). This low value enables use in ultra-low-power voltage monitors and battery-backed circuits where current budget is constrained.
Is LMV431ACM5X stable with ceramic output capacitors?
Yes - the LMV431ACM5X is stable with capacitive loads from 1 pF up to 10 kΩ, including common X7R and C0G ceramic capacitors. This eliminates the need for series resistance or external compensation in most shunt regulator configurations, simplifying layout and reducing component count.
What is the operating temperature range for LMV431ACM5X?
The LMV431ACM5X is rated for 0°C to 70°C commercial temperature operation, as defined in the Recommended Operating Conditions (Section 7.3) and confirmed in the Orderable Addendum. This range aligns with standard consumer and computing equipment requirements.
LMV431ACM5X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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%
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMV431ACM5X FAQ
1.How can I place an order for LMV431ACM5X through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431ACM5X 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 LMV431ACM5X reliable?
The price and inventory of LMV431ACM5X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431ACM5X is usually 5 days.
3.What payment methods are accepted for LMV431ACM5X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431ACM5X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431ACM5X?
LMV431ACM5X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431ACM5X 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 LMV431ACM5X?
For technical support, including LMV431ACM5X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431ACM5X requirements.
6.How does Aetrix verify that LMV431ACM5X is sourced from the original manufacturer or authorized distributors?
All LMV431ACM5X 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 LMV431ACM5X meets industry standards.
7.What is the process for return or replacement of LMV431ACM5X?
All LMV431ACM5X units undergo pre-shipment inspection (PSI). If there is an issue with LMV431ACM5X, 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 LMV431ACM5X part is unused and in its original packaging.
Return procedure for LMV431ACM5X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431ACM5X Tags
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AZ431LANTR-G1
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