LM431BIMX Equivalent & Substitute Parts

Part Overview

The LM431BIMX is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component features a 2.495V to 36V adjustable output with ±1% tolerance and 100 mA output current capability in an 8-SOIC surface mount package. The LM431BIMX is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and production continuity.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the LM431BIMX is determined by the following critical parameters:

Reference Type & Output Type: All substitutes maintain shunt reference architecture with adjustable output
Voltage Range: All substitutes support 2.495V to 36V output range
Current Capability: All substitutes provide 100 mA output current
Package: All substitutes use 8-SOIC surface mount package with identical 0.154" (3.90mm) width
Tolerance Grade: Substitutes are grouped by tolerance specification (±1%, ±0.4%, ±2.2%)
Temperature Range: Operating temperature varies by part grade; substitutes with -40°C ~ 85°C or wider ranges are direct replacements
Product Status: Active substitutes replace the obsolete LM431BIMX

Substitutes are categorized into three tolerance groups: ±1% tolerance (direct electrical equivalents), ±0.4% tolerance (tighter tolerance variants), and ±2.2% tolerance (relaxed tolerance variants). Within each tolerance group, parts differ by packaging format and temperature rating.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Range	Packaging	Product Status	Current - Cathode
LM431BIMX	onsemi	±1%	-40°C ~ 85°C	8-SOIC	Obsolete	1 mA
TL431ACDG	onsemi	±1%	0°C ~ 70°C	8-SOIC (Tube)	Active	1 mA
TL431ACDR2G	onsemi	±1%	0°C ~ 70°C	8-SOIC (Tape & Reel)	Active	1 mA
TL431AIDR2G	onsemi	±1%	-40°C ~ 85°C	8-SOIC (Cut Tape & Digi-Reel)	Active	1 mA
TL431AIDR	Texas Instruments	±1%	-40°C ~ 85°C	8-SOIC (Cut Tape & Digi-Reel)	Active	700 µA
TL431BCDR2G	onsemi	±0.4%	0°C ~ 70°C	8-SOIC (Tape & Reel)	Active	1 mA
TL431BIDG	onsemi	±0.4%	-40°C ~ 85°C	8-SOIC (Tube)	Active	1 mA
TL431BIDR2G	onsemi	±0.4%	-40°C ~ 85°C	8-SOIC (Tape & Reel)	Active	1 mA
TL431BVDR2G	onsemi	±0.4%	-40°C ~ 125°C	8-SOIC (Tape & Reel)	Active	1 mA
TL431CDR2G	onsemi	±2.2%	0°C ~ 70°C	8-SOIC (Tape & Reel)	Active	1 mA
TL431IDR2G	onsemi	±2.2%	-40°C ~ 85°C	8-SOIC (Tape & Reel)	Active	1 mA

Engineering Selection Recommendations

Direct Replacement (Matching Tolerance & Temperature Range): TL431AIDR2G (onsemi) and TL431AIDR (Texas Instruments) are direct functional replacements for the LM431BIMX. Both maintain ±1% tolerance, -40°C ~ 85°C operating range, and 100 mA output current in 8-SOIC packaging. TL431AIDR2G is supplied in Cut Tape & Digi-Reel format; TL431AIDR is available from Texas Instruments in the same format. Both are ROHS3 compliant and active products.

Extended Temperature Range Option: TL431BVDR2G provides ±0.4% tolerance with extended operating range of -40°C ~ 125°C, suitable for applications requiring tighter tolerance and higher temperature operation. This part is ROHS3 compliant and active.

Standard Temperature Range with Tighter Tolerance: TL431BIDR2G offers ±0.4% tolerance with -40°C ~ 85°C range in Tape & Reel packaging, providing improved accuracy for the same temperature specification as the original part.

Relaxed Tolerance Alternatives: TL431IDR2G provides ±2.2% tolerance with -40°C ~ 85°C range for cost-sensitive applications where tighter tolerance is not required.

All recommended substitutes are ROHS3 compliant, REACH unaffected, and classified as active products with established supply availability.

Frequently Asked Questions (FAQ)

Q: Can TL431ACDG or TL431ACDR2G replace the LM431BIMX in all applications? A: These parts match the ±1% tolerance and 8-SOIC package of the LM431BIMX but operate only to 0°C ~ 70°C. They are suitable only for applications within this narrower temperature range. For full -40°C ~ 85°C operation, use TL431AIDR2G or TL431AIDR.

Q: What is the difference between TL431AIDR2G and TL431AIDR? A: Both parts are electrically identical with ±1% tolerance and -40°C ~ 85°C operation. TL431AIDR2G is manufactured by onsemi; TL431AIDR is manufactured by Texas Instruments. The cathode current specification differs slightly (1 mA vs. 700 µA), but both are functionally compatible in standard applications.

Q: Can I use TL431BCDR2G or TL431BIDR2G instead of the LM431BIMX? A: Yes, these parts are compatible substitutes. They provide tighter ±0.4% tolerance compared to the ±1% specification of the LM431BIMX. TL431BCDR2G operates 0°C ~ 70°C; TL431BIDR2G operates -40°C ~ 85°C. Select based on your temperature requirements.

Q: What packaging formats are available for the TL431 series? A: Substitutes are available in Tube, Tape & Reel (TR), and Cut Tape & Digi-Reel formats. Tube packaging is suitable for manual assembly; Tape & Reel and Cut Tape formats support automated pick-and-place assembly. Verify your assembly process requirements before selecting packaging.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all active substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why does TL431BVDR2G have a higher maximum temperature rating? A: TL431BVDR2G is specified for -40°C ~ 125°C operation, extending the upper temperature limit to 125°C compared to 85°C for standard grades. This extended rating is provided by the manufacturer and is reflected in the part designation. Select this variant only if your application requires operation above 85°C.

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