Manufacturer Part Number

LM431AIM

Description

Adjustable shunt voltage reference IC. Offers stable reference voltage from 2.495V up to 37V, with 2.2% tolerance. Delivers up to 100 mA output current. Comes in 8-pin SOIC surface-mount package. Designed for power management and precision regulation in electronic circuits.

Specifications

Output voltage range: 2.495V to 37V adjustable

Maximum output current: 100 mA

Tolerance: ±2.2%

Temperature coefficient: 50ppm/°C (typical)

Operating temperature: -40°C to +85°C

Mounting: Surface mount

Package: 8-SOIC (3.90mm width)

RoHS compliant (ROHS3), REACH unaffected

Moisture Sensitivity Level: 1 (Unlimited)

Category: Power Management IC (PMIC), Voltage References

Product Status: Last Time Buy (not recommended for new designs)

Inventory: 3118 pieces in stock

Device Structure

Monolithic IC design with precision internal reference

Adjustable shunt topology (acts as a controlled Zener diode)

Easily adjustable output voltage with external resistor network

Packaged in industry-standard 8-pin SOIC surface mount case

Performance Characteristics

Accurate voltage reference over wide input and temperature range

Tight output tolerance for stable regulation

Low temperature drift improves long-term accuracy

Can source up to 100mA, suitable for moderate loads

Stable operation with capacitive loads

Application Environments

Switching power supplies

Battery chargers

Precision voltage references in analog circuits

Data converters (ADCs/DACs)

Instrumentation and test equipment

Overvoltage protection circuits

Industrial automation controls

General-purpose precision regulation tasks

Suitable for applications needing adjustable reference from 2.5V up to 37V

Selection Guidelines

Choose if you need a cost-effective, adjustable, shunt voltage reference (as opposed to series or fixed types)

Select for use in circuits needing moderate current (up to 100mA)

Make sure SOIC-8 package is compatible with your assembly process

Check ±2.2% tolerance is suitable for your accuracy requirements

Confirm operating temperature range fits your environment

Product is Last Time Buy; review lifecycle needs before committing to new designs

Usage Considerations

External resistors set output voltage—calculate accurately for correct reference

Ensure shunt current is sufficient for load and minimum cathode current requirements

Follow standard ESD and moisture precautions (MSL1 is robust, but proper handling is recommended)

Avoid new design-ins if long-term supply is needed, as manufacturer may discontinue

Comply with proper layout and bypassing for optimal stability and noise performance

Observe maximum ratings to prevent damage

Potential Equivalent/Replacement Models

Yes, there are several equivalent and pin-compatible alternatives:

LM431AIM/NOPB (lead-free, similar specs)

TL431AIDR (Texas Instruments, discrete version, similar voltage & tolerance)

TL431AID (Texas Instruments, similar performance)

TL431AIDR2G (ON Semiconductor, equivalent type)

TL431AIDG (ON Semiconductor, similar specs)

If you need more information or replacement guidance, please contact the Ariat-Tech sales team for support.

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