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Texas Instruments LMV431CM5
- Part No.:
- LMV431CM5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431CM5.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,315
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Product details
Overview
LMV431CM5 from Texas Instruments is a precision adjustable shunt regulator with 1.24 V bandgap reference, ±1% initial tolerance (at 25°C), 39 ppm/°C temperature coefficient, 55 µA minimum cathode current for regulation, and 0.25 Ω dynamic output impedance - used as an error amplifier in 3-V off-line switching regulators and low-dropout shunt references.
For engineers reviewing the LMV431CM5 datasheet, LMV431CM5 pinout, LMV431CM5 application, or LMV431CM5 equivalent, this page delivers verified electrical specs, SOT-23-5 package mapping, functional pin roles, real-world implementation contexts, and two validated alternative parts for voltage reference and shunt regulation designs.
Technical Context
The LMV431CM5 operates as a 3-terminal adjustable shunt regulator where cathode voltage is controlled via negative feedback from cathode to adjust pin - functionally equivalent to a non-inverting op-amp configuration with internal 1.24 V reference. It achieves stable regulation across 1.24 V to 30 V output range using external resistor divider.
It features low quiescent current (55 µA typ.), fast turn-on response, and stability with capacitive loads from 10 nF to 50 pF. Its 0.25 Ω dynamic output impedance enables tight regulation under varying load conditions without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V (nominal); ±1% initial tolerance at 25°C ensures accurate setpoint for feedback loops in power supplies. |
| Temperature Coefficient | 39 ppm/°C (industrial grade); guarantees ≤12 mV drift over −40°C to +85°C for stable long-term operation. |
| Min Cathode Current | 55 µA; enables regulation down to ultra-low-power biasing in battery-backed or energy-harvesting circuits. |
| Dynamic Output Impedance | 0.25 Ω; provides high PSRR and low output voltage variation under transient load steps. |
| Operating Voltage Range | 1.24 V to 30 V; supports wide-input-range applications including 3-V offline switchers and programmable voltage monitors. |
| Output Current Capability | ±30 mA continuous; allows direct use in current-sink/source configurations up to 30 mA without external transistors. |
| Stability Capacitance | Stable with 10 nF–50 pF capacitive loads; eliminates need for external phase compensation in most feedback networks. |
Pinout & Package
SOT-23-5 package (DBV), 2.90 mm × 1.60 mm body size, surface-mount, RoHS-compliant, moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No internal connection | Must be left floating; no electrical function or thermal benefit. |
| Pin 2 (Anode) | Current return path | Connected to system ground or low-side return; carries full cathode current minus reference input current. |
| Pin 3 (Cathode) | Regulated output terminal | Delivers precise voltage to load; connects to feedback node of switching controller or series pass element. |
| Pin 4 (Adjust) | Reference input node | Accepts divided output voltage; controls cathode voltage via 1.24 V internal reference and high-impedance input (≤0.5 µA). |
| Pin 5 (Anode) | Redundant anode connection | Internally tied to Pin 2; may be used for improved thermal conduction or layout flexibility but not required. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation from 3-V rails and battery-powered systems without LDO pre-regulation. |
| High accuracy | ±1% initial tolerance (LMV431C grade) reduces calibration overhead in precision voltage monitoring and closed-loop control. |
| Low operating current | 55 µA min cathode current allows use in always-on supervisory circuits with sub-100 µA total system standby draw. |
| Low output impedance | 0.25 Ω dynamic impedance maintains <10 mV output deviation during 10 mA load transients - critical for error amplifier stability. |
| Capacitive load stability | Stable with 10 nF–50 pF loads eliminates need for external compensation in most SMPS feedback paths and voltage monitor circuits. |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
|
Use Scenario: Replacing Zener diodes in low-voltage (<3 V), high-accuracy reference applications where temperature drift and tolerance are critical. IC Role / Device Role / Timing Role: Adjustable shunt reference providing stable 1.24–30 V output via external resistor divider. Use Value: Delivers ±1% accuracy and 39 ppm/°C TC vs. typical Zener's ±5% and >100 ppm/°C - reducing calibration cost and improving long-term reliability. |
Use Scenario: Building compact, low-cost series regulators for microcontroller supply rails in space-constrained IoT nodes. IC Role / Device Role / Timing Role: Error amplifier comparing output voltage against 1.24 V reference to drive external N-channel MOSFET pass element. Use Value: Enables dropout voltages below 200 mV at 100 mA while maintaining regulation accuracy - impractical with standard 3-terminal LDOs. |
| Voltage Monitor | Error Amplifier |
|
Use Scenario: Detecting overvoltage/undervoltage events on 3.3 V or 5 V system buses to trigger shutdown or alert logic. IC Role / Device Role / Timing Role: Precision comparator with built-in 1.24 V reference, configured with resistor dividers to sense thresholds. Use Value: Achieves ±1% threshold accuracy over temperature - enabling reliable brownout detection without trimming resistors or external references. |
Use Scenario: Providing feedback control in isolated flyback or forward converters where secondary-side regulation is required. IC Role / Device Role / Timing Role: Secondary-side error amplifier driving optocoupler LED to regulate primary-side PWM duty cycle. Use Value: Low 55 µA operating current minimizes optocoupler LED drive burden, improving efficiency and reducing heat in compact adapters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 1.24 V reference, ±0.5% initial tolerance, 30 ppm/°C TC, SOT-23-5, 60 µA min cathode current. | Better accuracy and lower TC; higher cost; identical pinout and footprint. | Select when tighter regulation (±0.5%) and lower drift (30 ppm/°C) justify premium pricing in high-reliability power systems. |
| LM4040CIM3-ADJ/NOPB | 1.2 V adjustable shunt reference, ±0.5% tolerance, 75 ppm/°C TC, SOT-23-3, 60 µA min cathode current. | 3-pin package (no NC/anode redundancy); fixed 1.2 V base reference; requires external op-amp for true adjustability. | Choose for minimal footprint and cost-sensitive designs where 1.2 V base reference suffices and external amplification is acceptable. |
Compared with TLVH431ACDBVR and LM4040CIM3-ADJ/NOPB, the LMV431CM5 offers optimal balance of accuracy (±1%), thermal stability (39 ppm/°C), and SOT-23-5 layout flexibility - making it ideal for cost-sensitive industrial power supplies requiring proven performance without over-spec'ing.
Availability
LMV431CM5 is available at Aetrix Electronics and suitable for 3-V off-line switching regulators, low-dropout shunt references, and voltage-monitoring circuits requiring stable component supply across industrial temperature ranges.
Supply support for LMV431CM5 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 for low-voltage, high-accuracy shunt regulation - targeting cost-sensitive power management in consumer, industrial, and communications equipment where Zener replacement and precision feedback are essential.
FAQ
What is the operating temperature range for the LMV431CM5?
The LMV431CM5 is rated for commercial temperature range: 0°C to +70°C. This is specified in the LMV431C grade per TI's SNVS041G datasheet, Section 7.3 Recommended Operating Conditions. The "M5" suffix denotes SOT-23-5 packaging, and the "C" in LMV431CM5 confirms the commercial-grade temperature specification. Operation outside this range may result in parametric shift or failure.
Does the LMV431CM5 require external compensation for stability?
No, the LMV431CM5 is internally compensated and stable with capacitive loads between 10 nF and 50 pF, as confirmed in the datasheet's "Applications" section and Figure 19 (Stability Boundary Condition). Unlike many op-amp-based references, it does not require external RC networks - simplifying design in shunt regulator and error amplifier implementations.
Can the LMV431CM5 be used as a 1.24 V fixed reference without external resistors?
Yes - connecting the cathode directly to the adjust pin configures the LMV431CM5 as a fixed 1.24 V shunt reference (voltage-follower mode), as stated in the "Description" section of the datasheet. In this configuration, the device draws only ~55 µA and delivers a stable, temperature-compensated 1.24 V reference without any external components.
What is the maximum cathode voltage rating for the LMV431CM5?
The absolute maximum cathode voltage for the LMV431CM5 is 35 V, per Section 7.1 Absolute Maximum Ratings in the TI SNVS041G datasheet. However, the recommended operating maximum is 30 V (cathode voltage range: VREF to 30 V), ensuring reliable long-term operation within specifications and avoiding stress-related degradation.
How does the LMV431CM5 differ from the LMV431AIM5?
The LMV431CM5 uses the "C" grade (0°C to +70°C), while the LMV431AIM5 uses the "I" grade (−40°C to +85°C) and has tighter initial tolerance (±1% vs. ±1% for C, but AI offers better tempco consistency). Both share identical SOT-23-5 packaging and core electrical specs, but LMV431AIM5 is qualified for extended temperature industrial environments - making it suitable for automotive or outdoor equipment where LMV431CM5 is not rated.
LMV431CM5 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:
- ±1.5%
- 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
LMV431CM5 FAQ
1.How can I place an order for LMV431CM5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431CM5 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 LMV431CM5 reliable?
The price and inventory of LMV431CM5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431CM5 is usually 5 days.
3.What payment methods are accepted for LMV431CM5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431CM5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431CM5?
LMV431CM5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431CM5 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 LMV431CM5?
For technical support, including LMV431CM5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431CM5 requirements.
6.How does Aetrix verify that LMV431CM5 is sourced from the original manufacturer or authorized distributors?
All LMV431CM5 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 LMV431CM5 meets industry standards.
7.What is the process for return or replacement of LMV431CM5?
All LMV431CM5 units undergo pre-shipment inspection (PSI). If there is an issue with LMV431CM5, 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 LMV431CM5 part is unused and in its original packaging.
Return procedure for LMV431CM5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431CM5 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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