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Texas Instruments LMV431ACM5/NOPB
- Part No.:
- LMV431ACM5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431ACM5/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,644
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Product details
Overview
LMV431ACM5/NOPB from Texas Instruments is a precision 1.24-V adjustable shunt regulator in SOT-23-5 package, designed for low-voltage feedback control in power management circuits. It delivers 0.5% initial reference voltage tolerance (at 25°C), 55 µA minimum cathode current for regulation, 0.25 Ω dynamic output impedance, and operates across 0°C to 70°C. It serves as an error amplifier in 3-V off-line switching regulators and voltage monitor in battery-powered systems.
For engineers reviewing the LMV431ACM5/NOPB datasheet, LMV431ACM5/NOPB pinout, LMV431ACM5/NOPB application, or LMV431ACM5/NOPB equivalent, key selection criteria include reference voltage accuracy over temperature (±12 mV full-range deviation), stable operation with capacitive loads from 1 pF to 10 kΩ, and compatibility with two-resistor external programming for adjustable output from 1.24 V to 30 V.
Technical Context
The LMV431ACM5/NOPB implements a band-gap reference core with negative feedback via the adjust (REF) pin, enabling precise cathode voltage control analogous to a non-inverting op-amp configuration. Its internal architecture supports programmable regulation by connecting external resistors between cathode and REF pins.
It functions as a 3-terminal shunt regulator where cathode voltage is set by R1/R2 divider ratio: VCATHODE = VREF(1 + R1/R2). The device maintains regulation down to 55 µA cathode current and exhibits low 39 ppm/°C temperature coefficient in the LMV431AI variant-though LMV431AC specifies ±12 mV total deviation over 0°C–70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V (typical at 25°C); sets base regulation point for external resistor network |
| Initial Tolerance | ±0.8% (1.228 V to 1.252 V at 25°C); defines accuracy of voltage setting before temperature drift |
| Temp Deviation | ±12 mV over 0°C–70°C; determines worst-case output shift in industrial ambient |
| Min Cathode Current | 55 µA; minimum current needed to maintain regulation-critical for ultra-low-power designs |
| Dynamic Impedance | 0.25 Ω (typical); ensures tight load regulation and fast transient response under varying cathode current |
| Operating Temp | 0°C to 70°C; validated commercial-grade range suitable for consumer and industrial power supplies |
| Max Cathode Voltage | 30 V; defines upper limit of programmable output when used as adjustable shunt regulator |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, gull-wing leads, RoHS-compliant matte tin (SN) finish, MSL 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 | Connected internally to cathode path; provides return path for regulated current |
| Pin 3 (Cathode) | Regulated output node | Voltage is controlled by REF pin feedback; sinks up to 30 mA |
| Pin 4 (REF) | Reference input | Feedback node for external resistor divider; senses 1.24 V reference internally |
| Pin 5 (Anode) | Second anode connection | Internally tied to Pin 2; improves thermal and current-handling capability |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24-V reference enables regulation in 1.8-V and 3-V systems where Zener diodes fail |
| Adjustable range | Programmable from 1.24 V to 30 V using two external resistors-no dedicated IC required |
| Low quiescent current | 55 µA min cathode current allows use in battery-backed or energy-harvesting applications |
| Capacitive stability | Stable with 1 pF–10 kΩ load capacitance-eliminates need for compensation networks |
| Fast turn-on | Enables responsive feedback in switching regulator error amplifiers without added delay |
Applications
| 3-V Off-Line Switching Regulator | Low-Dropout Shunt Regulator |
|---|---|
Use Scenario: Feedback control loop in isolated AC/DC flyback converters operating from 3-V input rails. IC Role / Device Role / Timing Role: Error amplifier comparing sensed output voltage against 1.24-V internal reference to drive optocoupler input. Use Value: Enables accurate ±1% output regulation without external op-amp; supports wide input voltage variation due to 30-V cathode rating. | Use Scenario: Precision voltage clamp for Li-ion battery protection circuitry in portable devices. IC Role / Device Role / Timing Role: Adjustable shunt regulator sinking excess current when cell voltage exceeds programmed threshold. Use Value: Programmable trip point (e.g., 4.2 V) with <±12 mV temp drift ensures safe charging termination across operating temperature. |
| Voltage Monitor | Current Source/Sink |
Use Scenario: Undervoltage lockout (UVLO) detection in microcontroller power domains. IC Role / Device Role / Timing Role: Reference comparator input node-cathode pulled high until supply reaches threshold defined by R1/R2. Use Value: Provides clean, hysteresis-free threshold detection with sub-100 µA quiescent draw-extends system standby time. | Use Scenario: Constant-current LED driver for status indicators in industrial HMIs. IC Role / Device Role / Timing Role: Two-terminal current source configured with cathode-to-REF short and series resistor. Use Value: Delivers stable 10–20 mA drive independent of supply variance (e.g., 5 V ±10%), eliminating need for current-sense resistors. |
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, SOT-23-5, but rated for −40°C to 125°C and higher 100-mA cathode current | Better suited for automotive under-hood or extended-temp industrial use; higher current headroom for crowbar circuits | Select TLVH431ACDBVR when >30 mA sink capability or >85°C ambient is required |
| LM4040CIM3-ADJ/NOPB | Fixed 2.5-V or 4.096-V reference only; no adjustable shunt function; SOT-23-3, 70-ppm/°C TC | Lacks cathode control and external programming-cannot replace LMV431ACM5/NOPB in shunt regulator topologies | Use LM4040CIM3-ADJ/NOPB only as fixed-voltage reference in op-amp-based error amplifiers-not as direct functional substitute |
Compared with TLVH431ACDBVR and LM4040CIM3-ADJ/NOPB, the LMV431ACM5/NOPB offers optimal balance of cost, adjustability, and commercial-temperature performance for 3-V–30-V shunt regulation-without over-specifying for harsh environments or sacrificing programmability.
Availability
LMV431ACM5/NOPB is available at Aetrix Electronics and suitable for 3-V off-line switching regulators, low-dropout shunt regulators, and voltage monitors requiring stable component supply in commercial-temperature applications.
Supply support for LMV431ACM5/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 developed to replace discrete Zener diodes in low-voltage feedback paths-enabling precise, temperature-stable regulation in space-constrained power management ICs and modular supplies.
FAQ
What is the reference voltage tolerance of LMV431ACM5/NOPB over temperature?
The LMV431ACM5/NOPB has a reference voltage deviation of ±12 mV over its full operating temperature range of 0°C to 70°C. This corresponds to ±0.97% of the nominal 1.24-V reference at 25°C. At 25°C alone, initial tolerance is tighter: 1.228 V to 1.252 V (±0.8%). The LMV431ACM5/NOPB does not specify a ppm/°C coefficient-the ±12 mV value is the guaranteed total drift envelope per datasheet Section 7.7.
Can LMV431ACM5/NOPB be used as a 2-terminal shunt regulator like a Zener diode?
Yes, LMV431ACM5/NOPB can operate as a 2-terminal device by shorting the cathode to the REF pin-configuring it as a 1.24-V voltage reference with cathode as output and anode as ground. In this mode, it draws only 55 µA minimum cathode current and maintains regulation up to 30 V cathode-anode voltage. The LMV431ACM5/NOPB achieves lower impedance (0.25 Ω) and better temperature stability than typical Zeners below 3 V.
What is the maximum capacitive load the LMV431ACM5/NOPB can drive stably?
The LMV431ACM5/NOPB is stable with capacitive loads ranging from 1 pF to 10 kΩ, as confirmed in Figure 19 of the SNVS041G datasheet. This wide stability margin eliminates the need for external compensation components in most applications-including output filtering in switching regulators and noise-sensitive voltage monitoring. Loads outside this range may induce oscillation or slow settling in the LMV431ACM5/NOPB.
How does the pin configuration of LMV431ACM5/NOPB differ from standard SOT-23-5 op-amps?
Unlike op-amps, the LMV431ACM5/NOPB uses Pin 1 as NC (no internal connection), Pins 2 and 5 both as Anode (internally tied), Pin 3 as Cathode (output), and Pin 4 as REF (feedback input). This 3-terminal functional layout-designed for shunt regulation-differs fundamentally from op-amp signal routing. Misinterpreting Pin 1 as functional or omitting the dual-anode connection risks thermal overstress or regulation failure in the LMV431ACM5/NOPB.
Is LMV431ACM5/NOPB compatible with lead-free reflow processes?
Yes, LMV431ACM5/NOPB is RoHS-compliant with matte tin (SN) lead finish and rated for MSL Level-1 at 260°C peak reflow per JEDEC J-STD-020. Its SOT-23-5 (DBV) package supports standard Pb-free reflow profiles without preconditioning. The LMV431ACM5/NOPB's maximum junction temperature is 150°C, and derating begins above 25°C ambient at 2.2 mW/°C-verified in Section 7.4 of the datasheet.
LMV431ACM5/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%
- 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/NOPB FAQ
1.How can I place an order for LMV431ACM5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431ACM5/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 LMV431ACM5/NOPB reliable?
The price and inventory of LMV431ACM5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431ACM5/NOPB is usually 5 days.
3.What payment methods are accepted for LMV431ACM5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431ACM5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431ACM5/NOPB?
LMV431ACM5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431ACM5/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 LMV431ACM5/NOPB?
For technical support, including LMV431ACM5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431ACM5/NOPB requirements.
6.How does Aetrix verify that LMV431ACM5/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV431ACM5/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 LMV431ACM5/NOPB meets industry standards.
7.What is the process for return or replacement of LMV431ACM5/NOPB?
All LMV431ACM5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV431ACM5/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 LMV431ACM5/NOPB part is unused and in its original packaging.
Return procedure for LMV431ACM5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431ACM5/NOPB Tags
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