LM431AIM3 Equivalent & Substitute Parts

Part Overview

The LM431AIM3 is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments. This component functions as a precision voltage reference in power management applications, offering adjustable output from 2.495V to 37V with ±2.2% tolerance. The part is classified as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for existing applications.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	37V
Current - Output	100 mA
Tolerance	±2.2%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LM431AIM3 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Min/Fixed): 2.495V
Voltage - Output (Max): 36V minimum
Current - Output: 100 mA
Package / Case: SOT-23-3
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories based on parametric equivalence and manufacturer recommendation status. All substitutes maintain identical or superior electrical performance within the specified operating envelope.

Parameter Comparison

Parameter	LM431AIM3	LM431AIM3/NOPB	LM431AIM3X/NOPB	AS431HMBNTR-G1
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Diodes Incorporated
Reference Type	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.495V	2.495V	2.495V	2.495V
Voltage - Output (Max)	37V	37V	37V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA
Tolerance	±2.2%	±2.2%	±2.2%	±1%
Temperature Coefficient	50ppm/°C Typical	50ppm/°C Typical	50ppm/°C Typical	20ppm/°C Typical
Current - Cathode	1 mA	1 mA	1 mA	500 µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Texas Instruments): LM431AIM3/NOPB and LM431AIM3X/NOPB are direct parametric equivalents to the LM431AIM3. Both parts maintain identical electrical specifications and are classified as Active products, ensuring long-term availability. These parts are suitable for direct replacement in all applications where the LM431AIM3 was originally specified.

Manufacturer Recommended Substitute (Diodes Incorporated): AS431HMBNTR-G1 is the manufacturer-recommended alternative from Diodes Incorporated. This part offers improved performance characteristics: tighter tolerance (±1% vs ±2.2%), lower temperature coefficient (20ppm/°C vs 50ppm/°C), and extended operating temperature range (-40°C ~ 125°C vs -40°C ~ 85°C). The maximum output voltage is 36V, which is acceptable for applications not requiring the full 37V specification. Lower cathode current (500 µA vs 1 mA) reduces power consumption. All parts maintain SOT-23-3 packaging and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can LM431AIM3/NOPB and LM431AIM3X/NOPB be used interchangeably with LM431AIM3? A: Yes. Both parts are parametric equivalents with identical electrical specifications and SOT-23-3 packaging. The primary difference is product status: LM431AIM3 is Last Time Buy, while the other two are Active products with greater availability.

Q: What are the key differences between Texas Instruments and Diodes Incorporated substitutes? A: The AS431HMBNTR-G1 from Diodes Incorporated offers superior performance: ±1% tolerance versus ±2.2%, 20ppm/°C temperature coefficient versus 50ppm/°C, and extended temperature range to 125°C. Maximum output voltage is 36V instead of 37V. Lower cathode current reduces power consumption.

Q: Is the 1V difference in maximum output voltage (37V vs 36V) significant? A: The difference is application-dependent. For designs operating below 36V, the AS431HMBNTR-G1 is fully compatible. Applications requiring the full 37V specification must use Texas Instruments parts.

Q: Are all substitute parts in the same package? A: Yes. All parts use SOT-23-3 (TO-236-3, SC-59) surface mount packaging, ensuring identical PCB footprint and mounting compatibility.

Q: Do all parts meet RoHS compliance requirements? A: Yes. All listed parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Q: Which substitute should be selected for new designs? A: For new designs, LM431AIM3/NOPB or LM431AIM3X/NOPB are recommended for direct compatibility with existing specifications. AS431HMBNTR-G1 is suitable when improved tolerance and temperature performance are beneficial and the 36V maximum output is acceptable.

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