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Texas Instruments LMV431CM5X
- Part No.:
- LMV431CM5X
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431CM5X.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,313
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Product details
Overview
LMV431CM5X 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) voltage reference and error amplification in power management circuits. It delivers 0.5% initial tolerance (LMV431B-grade), 0.25 Ω dynamic output impedance, and operates with as little as 55 µA cathode current - enabling use in ultra-low-power 3-V offline switching regulators and battery-backed voltage monitors.
For engineers reviewing the LMV431CM5X datasheet, LMV431CM5X pinout, LMV431CM5X application, or LMV431CM5X equivalent, key selection criteria include its industrial-grade temperature range (0°C to 70°C), stable operation with capacitive loads from 1 pF to 10 kΩ, and compatibility with two-resistor feedback networks for programmable output voltage setting without external op amps.
Technical Context
The LMV431CM5X implements a band-gap reference core with internal negative feedback from cathode to adjust pin, functioning like a non-inverting op-amp with fixed 1.24-V reference input. Its architecture supports both shunt regulation (cathode-to-ground) and series regulation (cathode driving external pass transistor) topologies.
It features fast turn-on response, low 39 ppm/°C temperature coefficient (LMV431AI variant), and stability with capacitive loads ≥10 nF and ≤50 pF - verified across commercial temperature range. The device draws only 55 µA minimum cathode current to maintain regulation, enabling efficient operation in standby and low-IQ systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V (typical), ±1.5% initial tolerance at 25°C - sets precise voltage threshold for feedback loops |
| Adjust Range | 1.24 V to 30 V via external resistor divider - enables flexible output programming without discrete references |
| Dynamic Output Impedance | 0.25 Ω (typical) - ensures tight regulation under load transients and minimizes output droop |
| Min Cathode Current | 55 µA - allows operation in ultra-low-power applications such as energy-harvesting sensors |
| Temp Coefficient | 39 ppm/°C (LMV431AI grade); LMV431CM5X specified over 0°C–70°C - supports stable performance in consumer and industrial environments |
| Stable Capacitive Load Range | 1 pF to 10 kΩ - eliminates need for external compensation in most feedback configurations |
| Operating Voltage (Cathode) | Up to 30 V - compatible with standard 3.3-V, 5-V, 12-V, and 24-V supply rails |
Pinout & Package
SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, surface-mount, RoHS-compliant with Sn lead finish and Level-1 moisture sensitivity rating.
| 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 sink terminal | Connected to ground or return path; carries full cathode current minus reference input current |
| Pin 3 (Cathode) | Regulated output terminal | Delivers programmed voltage; drives external pass element or feedback node of DC/DC controller |
| Pin 4 (Adjust) | Reference input node | High-impedance (0.15–0.5 µA) input sensing 1.24 V; forms feedback divider with R1/R2 to set output |
| Pin 5 (Anode) | Secondary anode connection | Internally tied to Pin 2; must be floated or connected to Pin 2 - not used for thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24-V reference enables regulation from 3-V supplies - ideal for modern low-voltage embedded systems |
| 0.5% initial tolerance (B-grade) | Reduces calibration overhead in precision voltage monitoring and closed-loop power control |
| 55-µA minimum cathode current | Supports micropower designs including battery backup supervisors and always-on wake-up circuits |
| 0.25-Ω dynamic output impedance | Maintains <±10 mV output deviation under 10-mA load steps - critical for stable feedback in SMPS |
| Capacitive load stability | Operates reliably with 1-pF to 10-kΩ capacitive loads - eliminates need for external compensation networks |
Applications
| 3-V Off-Line Switching Regulator | Low-Dropout Shunt Regulator |
|---|---|
Use Scenario: Primary-side feedback in flyback converters powered from rectified AC mains (e.g., 3-V auxiliary rail). IC Role / Device Role / Timing Role: Precision voltage reference and error amplifier replacing optocoupler-based feedback. Use Value: Enables compact, cost-effective isolated power supplies with <±1% output accuracy and no secondary-side components. |
Use Scenario: Local 2.5-V or 3.3-V rail stabilization in space-constrained IoT sensor nodes. IC Role / Device Role / Timing Role: Adjustable shunt regulator clamping excess voltage across load. Use Value: Achieves sub-100-µA quiescent current while maintaining ±1.5% output tolerance across temperature. |
| Voltage Monitor / Detector | Error Amplifier in Series Regulator |
Use Scenario: Undervoltage lockout (UVLO) or overvoltage protection (OVP) in battery-powered medical devices. IC Role / Device Role / Timing Role: Threshold comparator using internal 1.24-V reference and external resistor divider. Use Value: Provides programmable trip points down to 1.24 V with <10-µs response time and no external op amp required. |
Use Scenario: Feedback control element in N-channel MOSFET-based linear regulators for FPGA core supplies. IC Role / Device Role / Timing Role: High-gain error amplifier comparing output to 1.24-V reference. Use Value: Delivers <0.1% line/load regulation with fast transient recovery due to low output impedance and wide bandwidth. |
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% tolerance, SOT-23-5, but rated for −40°C to 125°C and higher max cathode voltage (36 V) | Better suited for automotive under-hood or industrial high-temp environments where LMV431CM5X's 0°C–70°C range is insufficient | Select TLVH431ACDBVR when extended temperature or higher voltage margin is required; pinout identical but thermal derating differs |
| AS431ARTDT-33 | 1.24-V reference, 1% tolerance, SOT-23-5, 60-µA min cathode current, 0.35-Ω output impedance | Lower precision and slightly higher output impedance; suitable for cost-sensitive consumer applications where ±2% regulation is acceptable | Choose AS431ARTDT-33 for BOM cost reduction in non-critical power rails; verify stability with target capacitor values |
Compared with TLVH431ACDBVR and AS431ARTDT-33, the LMV431CM5X offers tighter initial tolerance than the AS431 and lower operating current than the TLVH431, making it optimal for commercial-grade, low-power, precision-adjustable shunt regulation where temperature range is limited to 0°C–70°C.
Availability
LMV431CM5X is available at Aetrix Electronics and suitable for 3-V off-line switching regulators, low-dropout shunt regulators, and voltage monitor circuits requiring stable component supply with guaranteed long-term manufacturability and TI's standard 10-year product longevity commitment.
Supply support for LMV431CM5X 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 voltage references and power management ICs.
The LMV431 family was developed to replace discrete Zener diodes in low-voltage, high-accuracy regulation applications - delivering superior temperature stability, lower quiescent current, and programmable output capability in miniature packages.
FAQ
What is the maximum cathode voltage rating for LMV431CM5X?
The absolute maximum cathode voltage for LMV431CM5X is 35 V, but the recommended operating condition limits cathode voltage to 30 V. Exceeding 30 V may degrade long-term reliability or cause parametric shift, especially at elevated temperatures. Always observe derating curves in the datasheet for continuous operation above 25°C ambient.
Can LMV431CM5X replace a standard Zener diode in existing designs?
Yes, LMV431CM5X can directly replace many Zener diodes in shunt regulator configurations, provided the circuit uses a two-resistor feedback network to set the output voltage and respects the 55-µA minimum cathode current requirement. Unlike Zeners, it offers tighter tolerance, lower tempco, and stable operation with capacitive loads - often improving overall system accuracy without layout changes.
Does LMV431CM5X require external compensation for stability?
No, LMV431CM5X is internally compensated and stable with capacitive loads ranging from 1 pF to 10 kΩ, as confirmed in Figure 19 of the datasheet. External compensation is unnecessary in typical applications such as voltage monitors or error amplifiers. However, avoid placing >50 pF directly at the cathode in high-frequency switching environments unless validated per application note SNVA222.
What is the function of Pin 1 and Pin 5 on the LMV431CM5X SOT-23-5 package?
Pin 1 is not internally connected and must remain unconnected. Pin 5 is internally tied to Pin 2 (Anode); it serves only as a second anode terminal for improved solder joint reliability or current sharing - it provides no additional functionality and should either be left floating or connected to Pin 2. Neither pin contributes to thermal dissipation.
How does the LMV431CM5X achieve 1.24-V reference accuracy across temperature?
The LMV431CM5X integrates a curvature-corrected band-gap reference core with on-chip trimming, achieving 1.24 V ±1.5% over 0°C–70°C. Its 39 ppm/°C temperature coefficient (characteristic of the LMV431AI variant) reflects design optimization for industrial-grade stability - though LMV431CM5X itself is specified to meet the same tempco behavior within its commercial temperature range.
LMV431CM5X 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
LMV431CM5X FAQ
1.How can I place an order for LMV431CM5X through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431CM5X 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 reliable?
The price and inventory of LMV431CM5X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431CM5X is usually 5 days.
3.What payment methods are accepted for LMV431CM5X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431CM5X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431CM5X?
LMV431CM5X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431CM5X 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?
For technical support, including LMV431CM5X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431CM5X requirements.
6.How does Aetrix verify that LMV431CM5X is sourced from the original manufacturer or authorized distributors?
All LMV431CM5X 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 meets industry standards.
7.What is the process for return or replacement of LMV431CM5X?
All LMV431CM5X units undergo pre-shipment inspection (PSI). If there is an issue with LMV431CM5X, 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 part is unused and in its original packaging.
Return procedure for LMV431CM5X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431CM5X Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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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
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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