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Texas Instruments LMV431CM5X/NOPB
- Part No.:
- LMV431CM5X/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431CM5X/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,749
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Product details
Overview
LMV431CM5X/NOPB from Texas Instruments is a precision 1.24-V adjustable shunt regulator in SOT-23-5 package, enabling voltage regulation 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 cathode current, and 0.25 Ω dynamic output impedance for stable low-voltage error amplification in 3-V switching regulators and voltage monitors.
For engineers reviewing the LMV431CM5X/NOPB datasheet, LMV431CM5X/NOPB pinout, LMV431CM5X/NOPB application, or LMV431CM5X/NOPB equivalent, key selection criteria include its 1.24-V bandgap reference accuracy across 0°C to 70°C, compatibility with capacitive loads ≥10 nF, and functional equivalence to LMV431ACM5X/NOPB in commercial-grade shunt regulation designs.
Technical Context
The LMV431CM5X/NOPB operates as a two-terminal adjustable shunt regulator with internal 1.24-V bandgap reference and high-gain transconductance amplifier. Its cathode voltage is controlled by negative feedback from cathode to adjust pin, forming a non-inverting op-amp-like configuration where external R1/R2 sets output voltage per VCATHODE = VREF(1 + R1/R2).
It functions within 0.1–15 mA cathode current range, maintains regulation down to 55 µA, exhibits 0.25 Ω dynamic output impedance at DC, and achieves fast turn-on response suitable for error amplification in off-line 3-V switching regulators and overvoltage protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal at 25°C; enables precise 1.24–30 V programmable output via resistor divider |
| Initial Tolerance | ±0.5% (LMV431B grade); ensures tight output voltage accuracy without calibration |
| Temp Coefficient | 39 ppm/°C; limits drift to ±6 mV over full 0°C to 70°C operating range |
| Min Cathode Current | 55 µA; allows stable regulation in ultra-low-power applications like battery monitors |
| Dynamic Impedance | 0.25 Ω; provides low-output-impedance reference for high-loop-gain feedback networks |
| Operating Temp | 0°C to 70°C (commercial grade); validated for use in consumer and industrial power supplies |
| Max Cathode Voltage | 35 V absolute max; supports regulation up to 30 V output with safety margin |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 1.0 mm max height, gull-wing leads, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No connect | Internally unconnected; must remain floating or tied to ground per TI recommendation |
| Pin 2 (Anode) | Anode terminal | Common return path for cathode current; connects to system ground or negative rail |
| Pin 3 (Cathode) | Output terminal | Regulated output node; sinks current to maintain programmed voltage at adjust pin |
| Pin 4 (Adjust) | Reference input | High-impedance feedback node (0.15–0.5 µA input current); sets cathode voltage via resistor divider |
| Pin 5 (Anode) | Anode terminal | Duplicate anode connection; electrically tied to Pin 2 for robust grounding in high-noise environments |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24-V reference enables regulation starting at sub-2-V supply rails, critical for modern 3-V systems |
| Temperature compensation | 39 ppm/°C TC ensures <±6 mV drift over 0°C–70°C, eliminating need for external trimming |
| Low quiescent current | 55 µA min cathode current allows stable regulation in always-on monitoring circuits |
| Capacitive load stability | Stable with 10 nF–50 pF capacitive loads, simplifying EMI filtering without phase compensation |
| Fast turn-on response | Enables rapid error detection in overvoltage crowbar and undervoltage lockout circuits |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
Use Scenario: Providing precise 2.5-V bias for ADC reference in a 3.3-V IoT sensor node with limited board space. IC Role / Device Role / Timing Role: Adjustable shunt regulator acting as programmable voltage sink to clamp and stabilize reference node. Use Value: Replaces discrete Zener + transistor solution, reducing BOM count while maintaining ±0.5% accuracy over temperature. | Use Scenario: Enabling adjustable output in a low-dropout linear regulator using LM317 with external feedback. IC Role / Device Role / Timing Role: Precision reference replacing fixed 1.25-V internal bandgap to extend output range down to 1.24 V. Use Value: Achieves 1.24–30 V programmability with 39 ppm/°C stability, improving output accuracy vs. standard LM317. |
| Voltage Monitor | Error Amplifier |
Use Scenario: Detecting battery undervoltage (<3.0 V) in portable medical device to trigger shutdown before deep discharge. IC Role / Device Role / Timing Role: Threshold comparator using internal 1.24-V reference and external resistor divider to sense input voltage. Use Value: Delivers 0.5% threshold accuracy and 55 µA operating current, extending battery life vs. op-amp-based solutions. | Use Scenario: Closing feedback loop in 3-V flyback converter to regulate secondary-side output voltage. IC Role / Device Role / Timing Role: Primary-side error amplifier comparing optocoupler feedback signal against 1.24-V reference. Use Value: Provides low-impedance, temperature-stable reference enabling ±1% output regulation across line/load/temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV431ACM5X/NOPB | 1% initial tolerance (vs. 0.5% for LMV431CM5X/NOPB); otherwise identical electrical specs and pinout | Suitable for cost-sensitive designs where ±1% output accuracy is acceptable | Select LMV431ACM5X/NOPB when tighter tolerance is unnecessary and unit cost is prioritized |
| TLVH431IDBVR | 1.24-V reference, 0.5% tolerance, but rated for −40°C to 125°C and features 80-µA max IREF | Better suited for automotive under-hood or industrial high-temp environments | Choose TLVH431IDBVR only if extended temperature range or lower input current is required |
Compared with LMV431ACM5X/NOPB, LMV431CM5X/NOPB offers tighter 0.5% tolerance for higher-accuracy regulation; versus TLVH431IDBVR, it trades extended temperature rating for lower cost and proven stability in commercial 0°C–70°C power supplies.
Availability
LMV431CM5X/NOPB 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 commercial-grade performance.
Supply support for LMV431CM5X/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 precision shunt regulation in space-constrained power management systems, targeting replacement of discrete Zener-based references with improved accuracy, stability, and ease of use.
FAQ
What is the operating temperature range for LMV431CM5X/NOPB?
The LMV431CM5X/NOPB is specified for commercial operation from 0°C to 70°C. This range is confirmed in the "Recommended Operating Conditions" table of the SNVS041G datasheet and applies to all LMV431C-grade variants including LMV431CM5X/NOPB. Industrial-grade alternatives like LMV431AIM5X/NOPB extend to −40°C to 85°C.
How does LMV431CM5X/NOPB differ from LMV431ACM5X/NOPB?
The LMV431CM5X/NOPB has 0.5% initial reference voltage tolerance, while LMV431ACM5X/NOPB has 1% tolerance. All other electrical characteristics-including 1.24-V nominal reference, 39 ppm/°C tempco, 55 µA min cathode current, and SOT-23-5 packaging-are identical. LMV431CM5X/NOPB is the higher-accuracy variant within the same product family.
Can LMV431CM5X/NOPB be used as a voltage reference in ADC circuits?
Yes, LMV431CM5X/NOPB is commonly used as a precision 1.24-V reference for ADCs. Its 0.5% initial tolerance, 39 ppm/°C temperature coefficient, and 0.25 Ω dynamic output impedance provide stable, low-noise reference voltage. For optimal performance, decouple the adjust pin with a 10-nF capacitor and avoid capacitive loading on the cathode beyond 50 pF unless compensated.
What is the minimum cathode current required for regulation in LMV431CM5X/NOPB?
The LMV431CM5X/NOPB requires a minimum cathode current of 55 µA to maintain regulation, as specified in the "LMV431C Electrical Characteristics" table (IZ(MIN)). This low current enables use in battery-powered voltage monitors and always-on supervision circuits where quiescent power must be minimized.
Is LMV431CM5X/NOPB pin-compatible with other LMV431 variants in SOT-23-5?
Yes, LMV431CM5X/NOPB is pin-compatible with all LMV431x variants offered in the SOT-23-5 (DBV) package-including LMV431ACM5X/NOPB and LMV431BCM5X/NOPB-sharing identical pinout (Pin 1 NC, Pins 2 & 5 Anode, Pin 3 Cathode, Pin 4 Adjust) and footprint. No PCB changes are needed when upgrading between C/A/B grades in this package.
LMV431CM5X/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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMV431CM5X/NOPB FAQ
1.How can I place an order for LMV431CM5X/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431CM5X/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 LMV431CM5X/NOPB reliable?
The price and inventory of LMV431CM5X/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431CM5X/NOPB is usually 5 days.
3.What payment methods are accepted for LMV431CM5X/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431CM5X/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431CM5X/NOPB?
LMV431CM5X/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431CM5X/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 LMV431CM5X/NOPB?
For technical support, including LMV431CM5X/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431CM5X/NOPB requirements.
6.How does Aetrix verify that LMV431CM5X/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV431CM5X/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 LMV431CM5X/NOPB meets industry standards.
7.What is the process for return or replacement of LMV431CM5X/NOPB?
All LMV431CM5X/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV431CM5X/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 LMV431CM5X/NOPB part is unused and in its original packaging.
Return procedure for LMV431CM5X/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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