LM431ACM3/NOPB Texas Instruments voltage-references (SOT-23-3) In Stock
Texas Instruments LM431ACM3/NOPB is a precision adjustable shunt voltage reference (2.5V–36V, ±0.5% accuracy, 100mA sink, SOT-23-3). Starting at $0.225/unit (qty 1), $0.12 at 334+. In stock, ships from 1 piece.
- Manufacturer
- Texas Instruments
- Package
- SOT-23-3
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- LM431ACM3/NOPB Datasheet PDF
- Category
- voltage-references
- Price
- From $0.1200(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM431ACM3/NOPB?
- Adjustable output voltage: 2.5V to 36V via two external resistors
- A-grade initial accuracy: ±0.5% at 25°C (Vref = 2.495–2.505V)
- 100mA maximum sink current for flexible load driving
- Ultra-low dynamic impedance: 0.22Ω typical
- SOT-23-3 (SC-70) package for space-constrained designs
- RoHS compliant, Pb-free (NOPB suffix)
- Wide temperature range: -40°C to +125°C
What is LM431ACM3/NOPB used for?
Commonly used in power supply feedback networks, battery charger voltage regulation, and precision voltage monitoring circuits. Ideal for portable electronics, industrial power management, and consumer devices requiring stable adjustable reference voltages. Also applied in LED driver current regulation and overcurrent protection circuits.
What are the specifications of LM431ACM3/NOPB?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | OUTPUT VOLTAGE ADJUSTABLE FROM 2.495 TO 36V WITH TWO EXTERNAL RESISTORS |
| Analog IC - Other Type | TWO TERMINAL VOLTAGE REFERENCE |
| JESD-30 Code | R-PDSO-G3 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 0.1A |
| Output Voltage-Max | 2.55V |
| Output Voltage-Min | 2.44V |
| Output Voltage-Nom | 2.5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TO-236 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temp Coef of Voltage-Max | 97ppm/°C |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trim/Adjustable Output | YES |
| Package | SOT-23-3 |
Compliance & Regulatory
| RoHS Status | Compliant |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Where can I find the LM431ACM3/NOPB datasheet?
LM431ACM3/NOPB Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM431ACM3/NOPB?
Compatible alternatives and drop-in replacements for LM431ACM3/NOPB:
Pin-compatible SOT-23 adjustable shunt reference, ±0.5% accuracy, same 2.5V–36V range, direct drop-in substitute
Fixed 2.5V shunt reference, SOT-23-3, ±0.1% accuracy — preferred when output voltage adjustment is not needed
Frequently Asked Questions
What is the output voltage range of the LM431ACM3/NOPB?
The LM431ACM3/NOPB supports an adjustable output voltage from 2.5V (the internal reference voltage Vref) up to 36V, set by an external resistor divider connected to the REF pin. No external compensation capacitor is needed for most applications.
What does the 'A' grade and 'NOPB' suffix mean for LM431ACM3/NOPB?
The 'A' grade indicates higher initial accuracy with a Vref tolerance of ±0.5% (2.495V–2.505V) at 25°C, compared to ±2% for the standard grade. 'NOPB' (No Lead, No PB) means the device is lead-free and fully RoHS compliant, suitable for modern environmentally regulated designs.
What package and pin count does the LM431ACM3/NOPB use?
It comes in the SOT-23-3 (also known as SC-70 or DBZ) package with 3 pins: Cathode (K), Anode (A), and Reference (REF). The compact footprint makes it ideal for space-constrained PCB designs.
What are typical applications for the LM431ACM3/NOPB?
Typical applications include adjustable power supply regulation, battery charger voltage control, precision voltage monitoring, LED constant-current drivers, and feedback networks in switching regulators (e.g., flyback converters with optocoupler isolation).
What is the operating temperature range and maximum sink current?
The LM431ACM3/NOPB operates from -40°C to +125°C, making it suitable for industrial and automotive-adjacent environments. The maximum cathode sink current is 100mA, with a minimum cathode current of 1mA required for regulation.
What are common drop-in alternatives to the LM431ACM3/NOPB?
Pin-compatible alternatives include the TL431ACDBZR (TI, SOT-23), LM431A by ON Semiconductor, and the LM4040 (fixed voltage, SOT-23) for applications requiring a fixed 2.5V reference. The TLV431A offers lower cathode current (80µA) for low-power designs.
Related Guides
CDSOT23-SM712 RS-485 Interface Protection Design Guide
Design robust RS-485 protection with CDSOT23-SM712 using correct clamping, placement, grounding, termination, and surge coordination.
Jul 17, 2026
CR0805-FX-10R0ELF 10 Ohm 0805 Resistor Design Guide
Design CR0805-FX-10R0ELF into 0805 circuits with practical power, pulse, thermal, layout, tolerance, and sourcing checks.
Jul 17, 2026
How to Choose Würth Elektronik 150141-Series SMD Indicator LEDs
Choose 150141RS73100 and related Würth 150141 LEDs by color, brightness, 3528 package fit, drive margin, and procurement controls.
Jul 15, 2026
Molex 53398-0371 Selection Guide: Choosing a 3-Circuit Wire-to-Board Header
Choose Molex 53398-0371 by circuit count, mating system, derating, PCB geometry, assembly needs, and exact-suffix sourcing.
Jul 15, 2026
Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.2250 | $0.23 |
| 54+ | $0.1500 | $8.10 |
| 334+ | $0.1200 | $40.08 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“The anti-counterfeit verification gave us confidence we'd never had with other China suppliers.”