LM431CCM Equivalent & Substitute Parts

Part Overview

The LM431CCM is a shunt voltage reference IC manufactured by onsemi, designed for adjustable output applications in power management circuits. This component features a 2.495V adjustable output with ±0.5% tolerance and supports output currents up to 100 mA across a 36V maximum range. The LM431CCM is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical specifications, mechanical packaging, and thermal operating ranges.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	LM431CCM
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM431CCM is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt (must match)
Output Type: Adjustable (must match)
Voltage - Output (Min/Fixed): 2.495V (must match or exceed minimum)
Voltage - Output (Max): 36V or higher (must support full range)
Current - Output: 100 mA (must support)
Current - Cathode: 1 mA (must support)
Temperature Coefficient: 50ppm/°C Typical (must match)

Mechanical Compatibility Requirements:

Package / Case: 8-SOIC (0.154", 3.90mm Width) (must match)
Mounting Type: Surface Mount (must match)
Moisture Sensitivity Level: 1 (Unlimited) (must match or better)

Tolerance Consideration: Tolerance specifications determine substitution tier. The LM431CCM operates at ±0.5% tolerance. Parts with tighter tolerance (±0.4%) are direct substitutes. Parts with looser tolerance (±1%, ±2.2%) are acceptable substitutes where circuit design permits relaxed accuracy requirements.

Temperature Range Consideration: The LM431CCM operates across -25°C ~ 85°C. Substitute parts with equal or wider temperature ranges are acceptable. Parts with narrower ranges require application-specific evaluation.

Parameter Comparison

Parameter	LM431CCM	LM431CCMX	TL431ACDG	TL431ACDR2G	TL431AIDG	TL431AIDR2G	TL431BCDR2G	TL431BIDG	TL431BIDR2G	TL431BVDR2G	TL431CDR2G
Manufacturer	onsemi	Texas Instruments	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.495V	2.5V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V
Voltage - Output (Max)	36V	37V	36V	36V	36V	36V	36V	36V	36V	36V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±0.5%	-0.6%, +0.4%	±1%	±1%	±1%	±1%	±0.4%	±0.4%	±0.4%	±0.4%	±2.2%
Temperature Coefficient	50ppm/°C	50ppm/°C	50ppm/°C	50ppm/°C	50ppm/°C	50ppm/°C	50ppm/°C	50ppm/°C	50ppm/°C	50ppm/°C	50ppm/°C
Current - Cathode	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA
Operating Temperature	-25°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	0°C ~ 70°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Tightest Tolerance Match):

TL431BCDR2G, TL431BIDG, and TL431BIDR2G are the primary substitutes. These parts maintain ±0.4% tolerance, which is tighter than the LM431CCM's ±0.5%, ensuring superior accuracy. All three are active products with ROHS3 compliance. TL431BIDR2G offers the widest temperature range (-40°C ~ 85°C) matching the LM431CCM's lower bound while extending to 85°C. TL431BVDR2G extends the upper temperature limit to 125°C for applications requiring enhanced thermal performance.

Tier 2 - Functional Substitutes (Relaxed Tolerance):

TL431ACDG, TL431ACDR2G, TL431AIDG, and TL431AIDR2G operate at ±1% tolerance. These parts are suitable for applications where the circuit design accommodates the additional tolerance margin. TL431AIDG and TL431AIDR2G support the full -40°C ~ 85°C temperature range, matching the LM431CCM's lower operating limit.

Tier 3 - Limited Substitutes (Relaxed Tolerance, Narrower Temperature Range):

TL431CDR2G operates at ±2.2% tolerance with 0°C ~ 70°C temperature range. This part is acceptable only for applications with relaxed accuracy requirements and operating within the specified temperature window.

Cross-Manufacturer Option:

LM431CCMX from Texas Instruments provides an alternative with -0.6%, +0.4% asymmetric tolerance and 37V maximum output. This part is obsolete and operates within 0°C ~ 70°C, making it suitable only for legacy designs with narrower temperature requirements.

All substitute parts maintain identical 8-SOIC packaging, 100 mA output current, 1 mA cathode current, and 50ppm/°C temperature coefficient specifications. Selection should prioritize active products with ROHS3 compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can TL431ACDG replace LM431CCM directly?

A: TL431ACDG is functionally compatible but operates at ±1% tolerance versus the LM431CCM's ±0.5%. The part is suitable if circuit design accommodates the additional tolerance margin. Both maintain identical voltage ranges, output current, and 8-SOIC packaging. Temperature range differs: TL431ACDG operates 0°C ~ 70°C while LM431CCM covers -25°C ~ 85°C.

Q: What is the difference between TL431BIDR2G and TL431BIDG?

A: Both parts are electrically identical with ±0.4% tolerance and -40°C ~ 85°C operating range. The primary difference is packaging format: TL431BIDR2G is supplied in Tape & Reel (TR) format for automated assembly, while TL431BIDG is supplied in Tube format for manual handling. Inventory availability differs: TL431BIDR2G has 41,742 units in stock versus 1,767 units for TL431BIDG.

Q: Is TL431BVDR2G suitable for high-temperature applications?

A: Yes. TL431BVDR2G extends the upper operating temperature to 125°C while maintaining -40°C lower bound, providing the widest thermal range among available substitutes. It maintains ±0.4% tolerance and all other electrical specifications identical to TL431BIDR2G.

Q: Why does LM431CCMX show different tolerance specifications?

A: LM431CCMX from Texas Instruments specifies asymmetric tolerance of -0.6%, +0.4% rather than symmetric ±0.5%. This represents a different tolerance distribution but comparable overall accuracy envelope. The part is obsolete and operates within narrower 0°C ~ 70°C temperature range.

Q: Can I use TL431CDR2G as a substitute?

A: TL431CDR2G is mechanically and electrically compatible but operates at ±2.2% tolerance, significantly looser than the LM431CCM's ±0.5%. Use only if circuit design explicitly permits this tolerance margin and application operates within 0°C ~ 70°C temperature window.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original LM431CCM and obsolete LM431CCMX do not specify RoHS status. For new designs requiring RoHS compliance, select from active parts: TL431ACDG, TL431ACDR2G, TL431AIDG, TL431AIDR2G, TL431BCDR2G, TL431BIDG, TL431BIDR2G, TL431BVDR2G, or TL431CDR2G.

Q: What packaging options are available for TL431 series substitutes?

A: All substitute parts maintain 8-SOIC (0.154", 3.90mm Width) surface mount packaging. Packaging format varies: Tube (DG suffix), Tape & Reel (DR2G suffix), and Cut Tape & Digi-Reel (DR2G variants). Selection depends on assembly process requirements and inventory management preferences.

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