TL431ACD Equivalent & Substitute Parts

Part Overview

The TL431ACD 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 TL431ACD from onsemi is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Alternative variants within the TL431 family remain in active production with enhanced specifications and improved availability.

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	-25°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TL431ACD is determined by strict adherence to the following electrical and mechanical parameters:

Critical Compatibility Parameters:

Reference Type: Shunt (all substitutes must maintain shunt topology)
Output Type: Adjustable (voltage regulation capability)
Voltage Range: 2.495V minimum to 36V maximum output
Current - Output: 100 mA minimum capability
Package / Case: 8-SOIC form factor (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Tolerance Grades: Substitutes are grouped by tolerance specification (±1%, ±0.4%, ±2.2%). Parts with tighter tolerance (±0.4%) are direct functional upgrades. Parts with looser tolerance (±2.2%) are acceptable only where the original ±1% specification is not mandatory.

Temperature Range Considerations: Operating temperature ranges vary across substitutes. Selection depends on application requirements. Extended temperature range variants (-40°C to 125°C) provide broader operational capability.

Packaging Variants: Substitutes are available in Tube and Tape & Reel (TR) packaging. Packaging selection affects handling and assembly processes but does not alter electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Operating Temp (°C)	Packaging	Product Status	RoHS Status
TL431ACD	onsemi	±1%	-25 ~ 85	-	Obsolete	-
TL431ACDG	onsemi	±1%	0 ~ 70	Tube	Active	ROHS3 Compliant
TL431ACDR2G	onsemi	±1%	0 ~ 70	Tape & Reel	Active	ROHS3 Compliant
TL431BCDR2G	onsemi	±0.4%	0 ~ 70	Tape & Reel	Active	ROHS3 Compliant
TL431BIDG	onsemi	±0.4%	-40 ~ 85	Tube	Active	ROHS3 Compliant
TL431BIDR2G	onsemi	±0.4%	-40 ~ 85	Tape & Reel	Active	ROHS3 Compliant
TL431BVDR2G	onsemi	±0.4%	-40 ~ 125	Tape & Reel	Active	ROHS3 Compliant
TL431CDR2G	onsemi	±2.2%	0 ~ 70	Tape & Reel	Active	ROHS3 Compliant
TL431IDR2G	onsemi	±2.2%	-40 ~ 85	Tape & Reel	Active	ROHS3 Compliant
TL431ACD	STMicroelectronics	±1%	0 ~ 70	-	Obsolete	ROHS3 Compliant
TL431AID	STMicroelectronics	±1%	-40 ~ 105	-	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Tolerance ±1%): TL431ACDG and TL431ACDR2G are active production equivalents with identical ±1% tolerance. TL431ACDG is supplied in Tube packaging; TL431ACDR2G is supplied in Tape & Reel. Both are ROHS3 compliant and suitable for applications requiring the original ±1% specification. Operating temperature range is 0°C to 70°C, which is narrower than the original part's -25°C to 85°C range.

For Enhanced Tolerance (±0.4%): TL431BCDR2G, TL431BIDG, TL431BIDR2G, and TL431BVDR2G offer tighter ±0.4% tolerance, providing improved voltage regulation accuracy. TL431BIDR2G and TL431BVDR2G support extended temperature ranges (-40°C to 85°C and -40°C to 125°C respectively), enabling use in broader environmental conditions. All variants are ROHS3 compliant and in active production.

For Cost-Optimized Selection (±2.2%): TL431CDR2G and TL431IDR2G feature ±2.2% tolerance and are suitable for applications where tighter tolerance is not required. TL431IDR2G supports -40°C to 85°C operating range. Both are ROHS3 compliant and in active production with high inventory availability.

Product Status Consideration: All recommended substitutes are in active production status, ensuring long-term availability and supply chain stability. The original TL431ACD (onsemi) is obsolete; substitution is necessary for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can TL431ACDG directly replace the obsolete TL431ACD? A: TL431ACDG is electrically equivalent with identical ±1% tolerance, 2.495V to 36V output range, and 100 mA output current. Both use 8-SOIC packaging. The primary difference is operating temperature range: TL431ACDG operates 0°C to 70°C versus the original -25°C to 85°C. Verify application temperature requirements before substitution.

Q: What is the difference between TL431ACDR2G and TL431ACDG? A: Both parts are electrically identical with ±1% tolerance. The difference is packaging: TL431ACDG uses Tube packaging for manual assembly; TL431ACDR2G uses Tape & Reel (TR) packaging for automated assembly. Select based on manufacturing process requirements.

Q: Can I use TL431BCDR2G (±0.4%) instead of TL431ACD (±1%)? A: Yes. TL431BCDR2G provides tighter tolerance (±0.4%) and is a functional upgrade. All other electrical parameters remain identical. This substitution improves voltage regulation accuracy. Operating temperature range is 0°C to 70°C.

Q: What is the advantage of TL431BVDR2G over other B-grade variants? A: TL431BVDR2G supports the widest operating temperature range (-40°C to 125°C) among B-grade variants while maintaining ±0.4% tolerance. Select this variant for applications requiring extended temperature operation or high-temperature environments.

Q: Are all substitute parts ROHS3 compliant? A: All active production substitutes listed are ROHS3 compliant. The original TL431ACD (onsemi) does not specify RoHS status; the STMicroelectronics variant is ROHS3 compliant.

Q: Can I use TL431CDR2G or TL431IDR2G for cost reduction? A: Yes, if application specifications permit ±2.2% tolerance. These C-grade and I-grade variants are functionally compatible with identical output voltage range and current capability. Verify that the looser tolerance does not impact circuit performance before substitution.

Q: What packaging options are available for production? A: Tube packaging (manual assembly) and Tape & Reel packaging (automated assembly) are available. Select based on manufacturing process. Both packaging types maintain identical electrical specifications and 8-SOIC form factor.

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