LM431ACM3/NOPBIn StockTexas Instruments
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
Key Features
- 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
Applications
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.
Specifications
| 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 |
Alternate & Equivalent Parts
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.
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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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.2250 | $0.23 |
| 54+ | $0.1500 | $8.10 |
| 334+ | $0.1200 | $40.08 |
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