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Texas Instruments LMV431ACM5
- Part No.:
- LMV431ACM5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431ACM5.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,483
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Product details
Overview
LMV431ACM5 from Texas Instruments is a precision adjustable shunt regulator with 1.24 V bandgap reference, ±1% initial tolerance (25°C), 55 µA minimum cathode current for regulation, 0.25 Ω dynamic output impedance, and operation over 0°C to 70°C. It functions as a low-voltage error amplifier or voltage monitor in 3-V off-line switching regulators and low-dropout series regulators.
For engineers reviewing the LMV431ACM5 datasheet, LMV431ACM5 pinout, LMV431ACM5 application, or LMV431ACM5 equivalent, key selection criteria include its SOT-23-5 package, 1.24 V reference accuracy across temperature, stable operation with 10 nF–50 pF capacitive loads, and compatibility with two-resistor feedback networks for programmable output up to 30 V.
Technical Context
The LMV431ACM5 implements a precision bandgap reference core with internal negative feedback from cathode to adjust pin, operating like a non-inverting op-amp configuration. Its reference input current remains below 0.5 µA at 25°C, enabling high-impedance resistor dividers without significant loading error.
It delivers stable regulation with capacitive loads between 10 nF and 50 pF, and supports programmable output voltages from 1.24 V to 30 V using external R1/R2 resistors. The device exhibits 39 ppm/°C temperature coefficient in the LMV431AI variant, but LMV431AC specifies 4–12 mV deviation over 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal (1.228–1.252 V at 25°C); sets base regulation point for feedback network |
| Initial Tolerance | ±1% at 25°C; enables accurate voltage setting without trimming in cost-sensitive designs |
| Temp Range | 0°C to 70°C commercial grade; suitable for consumer and industrial ambient environments |
| Dynamic Output Impedance | 0.25 Ω typical; ensures tight regulation under load transients and low output ripple |
| Min Cathode Current | 55 µA; defines lowest usable current for stable regulation, critical for ultra-low-power biasing |
| Ref Input Current | 0.15–0.5 µA; permits use of high-value feedback resistors (>1 MΩ) without gain error |
| Output Voltage Range | 1.24 V to 30 V via external resistors; replaces multiple fixed Zener diodes with single component |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount, RoHS-compliant tin (SN) lead finish, moisture sensitivity level 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 sink terminal | Connects to ground or return path; carries full cathode current minus reference current |
| Pin 3 (Cathode) | Regulated output node | Delivers programmed voltage; requires external resistor to supply rail for shunt operation |
| Pin 4 (Adjust) | Feedback reference input | High-impedance node sensing divider voltage; controls cathode voltage via internal comparator |
| Pin 5 (Anode) | Second anode connection | Internally tied to Pin 2; must be connected to same ground node for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 1.8 V–3.3 V systems where standard Zeners fail |
| Temperature-compensated reference | 4–12 mV total deviation over 0°C–70°C ensures stable setpoint in uncontrolled environments |
| Low quiescent current | 55 µA min cathode current allows use in battery-powered applications with microamp-level standby budgets |
| Capacitive load stability | Stable with 10 nF–50 pF loads eliminates need for external compensation in most SMPS feedback loops |
| Programmable output range | 1.24 V to 30 V via two external resistors reduces BOM count versus discrete Zener arrays |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
Use Scenario: Providing precise 2.5 V bias for analog sensor front-end in a 3.3 V IoT node. IC Role / Device Role / Timing Role: Adjustable shunt regulator sinking excess current to maintain stable 2.5 V rail. Use Value: Replaces 2.5 V Zener + series resistor with tighter tolerance (±1% vs ±5%) and lower tempco. | Use Scenario: Enabling adjustable output in a discrete N-channel MOSFET-based linear regulator. IC Role / Device Role / Timing Role: Error amplifier comparing output voltage against 1.24 V reference to drive gate of pass transistor. Use Value: Achieves <1% output accuracy without trimming, with fast turn-on response for load-step recovery. |
| Voltage Monitor | Error Amplifier |
Use Scenario: Detecting undervoltage condition (<2.7 V) on a microcontroller supply rail. IC Role / Device Role / Timing Role: Precision threshold detector triggering reset signal when supply drops below setpoint. Use Value: Uses internal 1.24 V reference and external resistor divider to achieve ±1% trip accuracy over temperature. | Use Scenario: Closing feedback loop in a 3 V off-line flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Isolated error amplifier transmitting output voltage error across optocoupler to primary controller. Use Value: Provides stable 1.24 V reference and low output impedance (0.25 Ω) for clean optocoupler LED drive. |
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 ref, ±0.5% initial tolerance, SOT-23-5, 0°C–70°C, 80 µA min cathode current | Higher accuracy but higher minimum cathode current; less suitable for ultra-low-current biasing | Select TLVH431ACDBVR when ±0.5% reference tolerance is required and >80 µA cathode current is available. |
| LM4040CIM3-ADJ/NOPB | Adjustable shunt reference, ±0.5% tolerance, SOT-23-3, 100 µA min cathode current, 1.2 V–10 V range | Narrower max output (10 V vs 30 V); 3-pin package lacks dedicated anode pin, limiting layout flexibility | Choose LM4040CIM3-ADJ/NOPB for space-constrained designs needing ±0.5% accuracy below 10 V, accepting reduced voltage range. |
Compared with TLVH431ACDBVR and LM4040CIM3-ADJ/NOPB, the LMV431ACM5 offers the widest programmable output (up to 30 V) and lowest minimum cathode current (55 µA), making it optimal for cost-sensitive, wide-range, low-power shunt regulation where ±1% tolerance is sufficient.
Availability
LMV431ACM5 is available at Aetrix Electronics and suitable for 3-V off-line switching regulators, low-dropout series regulators, and voltage monitoring circuits requiring stable component supply with guaranteed commercial-temperature performance.
Supply support for LMV431ACM5 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 company designing analog ICs, embedded processors, and system solutions for industrial, automotive, and consumer markets.
The LMV431 family was developed as a low-voltage, adjustable precision shunt regulator line targeting cost-effective replacement of Zener diodes in power management and feedback control applications.
FAQ
What is the reference voltage tolerance of the LMV431ACM5 at room temperature?
The LMV431ACM5 has a reference voltage tolerance of ±1% at 25°C, with a typical value of 1.24 V and a specified range of 1.228 V to 1.252 V. This tolerance is confirmed in the LMV431AC Electrical Characteristics table (Section 7.7) of the SNVS041G datasheet. The LMV431ACM5 maintains this accuracy without external calibration, supporting reliable voltage setting in production designs.
Can the LMV431ACM5 operate with a 1.8 V supply rail?
Yes, the LMV431ACM5 can regulate from a 1.8 V supply when configured as a shunt regulator with appropriate external resistors. Its 1.24 V reference and low 55 µA minimum cathode current allow functional operation down to supply voltages only slightly above the programmed output - e.g., 1.8 V supply regulating 1.5 V output. The device's low-voltage capability is explicitly stated in the "Low-Voltage Operation/Wide Adjust Range" feature list.
What is the maximum output voltage achievable with the LMV431ACM5?
The LMV431ACM5 supports programmable output voltages up to 30 V using an external two-resistor feedback network, as confirmed in the device description and absolute maximum ratings (cathode voltage ≤35 V). This 30 V upper limit is consistent across all LMV431 variants and enables direct replacement of higher-voltage Zener diodes without redesigning the feedback topology.
Is the LMV431ACM5 stable with ceramic output capacitors?
Yes, the LMV431ACM5 is stable with ceramic capacitors ranging from 10 nF to 50 pF, as documented in the Applications section and Figure 19 (Stability Boundary Condition). This stability eliminates the need for series resistance or additional compensation components when used in feedback loops of switching regulators or low-noise LDOs.
How does the LMV431ACM5 differ from the LMV431AIM5 in terms of temperature range?
The LMV431ACM5 is rated for 0°C to 70°C (commercial grade), while the LMV431AIM5 extends to −40°C to 85°C (industrial grade). Both share identical electrical characteristics at 25°C, but the LMV431AIM5 guarantees 1.24 V reference performance across the wider range, with 6–20 mV total deviation versus 4–12 mV for the LMV431ACM5. The LMV431ACM5 is optimized for cost-sensitive applications where ambient temperature stays within commercial limits.
LMV431ACM5 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
LMV431ACM5 FAQ
1.How can I place an order for LMV431ACM5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431ACM5 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 LMV431ACM5 reliable?
The price and inventory of LMV431ACM5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431ACM5 is usually 5 days.
3.What payment methods are accepted for LMV431ACM5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431ACM5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431ACM5?
LMV431ACM5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431ACM5 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 LMV431ACM5?
For technical support, including LMV431ACM5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431ACM5 requirements.
6.How does Aetrix verify that LMV431ACM5 is sourced from the original manufacturer or authorized distributors?
All LMV431ACM5 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 LMV431ACM5 meets industry standards.
7.What is the process for return or replacement of LMV431ACM5?
All LMV431ACM5 units undergo pre-shipment inspection (PSI). If there is an issue with LMV431ACM5, 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 LMV431ACM5 part is unused and in its original packaging.
Return procedure for LMV431ACM5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431ACM5 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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
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