LM431CIM Equivalent & Substitute Parts

Part Overview

The LM431CIM is an adjustable shunt voltage reference IC manufactured by onsemi, designed for precision voltage regulation applications. This component operates with a fixed output voltage of 2.495V and adjustable maximum output to 36V, delivering up to 100mA output current with ±0.5% tolerance. The LM431CIM is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the core shunt reference functionality while offering improved product status and compliance certifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM431CIM
Manufacturer	onsemi
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100mA
Tolerance	±0.5%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1mA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Core Compatibility Requirements:

Reference Type: Shunt (all substitutes maintain this classification)
Output Type: Adjustable (all substitutes maintain adjustable output)
Voltage - Output (Min/Fixed): 2.495V (all substitutes match this specification)
Voltage - Output (Max): 36V (all substitutes match this specification)
Current - Output: 100mA (all substitutes match this specification)
Temperature Coefficient: 50ppm/°C Typical (all substitutes match this specification)
Current - Cathode: 1mA (all substitutes match this specification)
Mounting Type: Surface Mount (all substitutes maintain this mounting)
Package / Case: 8-SOIC (0.154", 3.90mm Width) (all substitutes maintain this package)

Variable Parameters Affecting Substitution:

Tolerance: Ranges from ±0.4% to ±2.2% (tighter tolerance substitutes are compatible; looser tolerance substitutes require application verification)
Operating Temperature: Ranges from 0°C ~ 70°C to -40°C ~ 125°C (wider temperature range substitutes are compatible; narrower ranges require application verification)
Product Status: Active substitutes are preferred over obsolete status
Packaging Format: Tube, Tape & Reel (TR), or Cut Tape (CT) & Digi-Reel® (format selection depends on procurement requirements)

Parameter Comparison

Part Number	Tolerance	Operating Temperature	Packaging	Product Status	RoHS Status
LM431CIM	±0.5%	-40°C ~ 85°C	-	Obsolete	-
TL431ACDG	±1%	0°C ~ 70°C	Tube	Active	ROHS3 Compliant
TL431ACDR2G	±1%	0°C ~ 70°C	Tape & Reel (TR)	Active	ROHS3 Compliant
TL431AIDG	±1%	-40°C ~ 85°C	Tube	Active	ROHS3 Compliant
TL431AIDR2G	±1%	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active	ROHS3 Compliant
TL431BCDR2G	±0.4%	0°C ~ 70°C	Tape & Reel (TR)	Active	ROHS3 Compliant
TL431BIDG	±0.4%	-40°C ~ 85°C	Tube	Active	ROHS3 Compliant
TL431BIDR2G	±0.4%	-40°C ~ 85°C	Tape & Reel (TR)	Active	ROHS3 Compliant
TL431BVDR2G	±0.4%	-40°C ~ 125°C	Tape & Reel (TR)	Active	ROHS3 Compliant
TL431CDR2G	±2.2%	0°C ~ 70°C	Tape & Reel (TR)	Active	ROHS3 Compliant
TL431IDR2G	±2.2%	-40°C ~ 85°C	Tape & Reel (TR)	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are manufactured by onsemi and maintain identical core electrical specifications (2.495V minimum output, 36V maximum output, 100mA output current, 50ppm/°C temperature coefficient, 1mA cathode current) and mechanical compatibility (8-SOIC package, surface mount).

For applications requiring ±0.5% tolerance matching: TL431AIDG and TL431AIDR2G provide ±1% tolerance with active product status and ROHS3 compliance. TL431BIDG and TL431BIDR2G offer superior ±0.4% tolerance with active status and ROHS3 compliance.

For applications with -40°C ~ 85°C temperature range requirements: TL431AIDG, TL431AIDR2G, TL431BIDG, TL431BIDR2G, and TL431IDR2G all support this range with active product status and ROHS3 compliance.

For applications with extended temperature range (-40°C ~ 125°C): TL431BVDR2G is the only substitute offering this specification with ±0.4% tolerance, active product status, and ROHS3 compliance.

For applications with relaxed tolerance requirements (±2.2%): TL431CDR2G and TL431IDR2G provide cost-effective alternatives with active product status and ROHS3 compliance.

All substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting modern regulatory requirements. Packaging format selection (Tube, Tape & Reel, or Cut Tape & Digi-Reel) depends on procurement and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can TL431ACDG directly replace LM431CIM? A: TL431ACDG maintains all core electrical and mechanical specifications but operates within 0°C ~ 70°C temperature range versus LM431CIM's -40°C ~ 85°C. Tolerance is ±1% versus ±0.5%. Substitution is valid only if application temperature and tolerance requirements fall within TL431ACDG specifications.

Q: What is the difference between TL431AIDG and TL431AIDR2G? A: Both parts are electrically identical with ±1% tolerance and -40°C ~ 85°C operating range. The difference is packaging format: TL431AIDG is supplied in Tube, while TL431AIDR2G is supplied in Cut Tape & Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Why are some substitutes marked with ±0.4% tolerance when LM431CIM is ±0.5%? A: Tighter tolerance specifications (±0.4%) are electrically compatible with applications designed for ±0.5% tolerance. These parts provide superior accuracy and are direct substitutes. Looser tolerance parts (±1%, ±2.2%) require application verification to confirm tolerance requirements are met.

Q: Is TL431BVDR2G suitable for high-temperature applications? A: TL431BVDR2G operates from -40°C ~ 125°C, making it suitable for extended temperature range applications. It maintains ±0.4% tolerance, 100mA output current, and all other core specifications. This part is the only substitute offering the full -40°C ~ 125°C range.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for electronic components.

Q: What packaging format should I select for high-volume production? A: Tape & Reel (TR) format is standard for automated assembly processes. Cut Tape & Digi-Reel format offers flexibility for mixed-volume production. Tube format is suitable for manual assembly or lower-volume applications. All formats maintain identical electrical specifications.

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