TL431CDG Equivalent & Substitute Parts

Part Overview

The TL431CDG is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component features a 2.495V adjustable output with ±2.2% tolerance and supports output currents up to 100 mA across a 36V range. The TL431CDG is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current manufacturing and compliance standards.

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	±2.2%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL431CDG is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Reference Type: Shunt (all substitutes must be shunt-type references)
Output Type: Adjustable (output voltage must be user-adjustable)
Voltage Range: Output minimum 2.495V or lower, maximum 36V or higher
Current - Output: 100 mA minimum
Package / Case: 8-SOIC form factor (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Tolerance Consideration: Substitutes with equal or tighter tolerance (±2.2% or better) maintain or improve circuit performance. Parts with looser tolerance may require circuit redesign validation.

Temperature Range: The TL431CDG operates 0°C ~ 70°C. Substitutes with extended temperature ranges provide additional design flexibility but are not required for direct replacement in the specified operating window.

Compliance & Status: Active product status is preferred for long-term availability. RoHS3 compliance ensures regulatory alignment with current manufacturing standards.

Parameter Comparison

Part Number	Manufacturer	Output (Min)	Output (Max)	Current	Tolerance	Temp Coeff	Cathode Current	Temp Range	Status	RoHS
TL431CDG	onsemi	2.495V	36V	100 mA	±2.2%	50ppm/°C	1 mA	0°C ~ 70°C	Obsolete	ROHS3
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	50ppm/°C	1 mA	-25°C ~ 85°C	Active	ROHS3
LM431AIMX	National Semiconductor	2.5V	36V	100 mA	±2%	50ppm/°C	1 mA	-40°C ~ 85°C	Active	Non-compliant
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	50ppm/°C	1 mA	-25°C ~ 85°C	Active	Undefined
LM431CIMX	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	1 mA	-40°C ~ 85°C	Active	ROHS3
TL431CDR2G	onsemi	2.495V	36V	100 mA	±2.2%	50ppm/°C	1 mA	0°C ~ 70°C	Active	ROHS3
TL431CD	Fairchild Semiconductor	2.495V	36V	100 mA	±2.21%	50ppm/°C	1 mA	-25°C ~ 85°C	Obsolete	Non-compliant
TL431CDT	STMicroelectronics	2.495V	36V	100 mA	±2.21%	50ppm/°C	1 mA	0°C ~ 70°C	Active	ROHS3
TL1431ACDT	STMicroelectronics	2.5V	36V	100 mA	±0.25%	90ppm/°C	600 µA	-20°C ~ 70°C	Active	ROHS3
TL1431AIDT	STMicroelectronics	2.5V	36V	100 mA	±0.25%	100ppm/°C	700 µA	-40°C ~ 105°C	Active	ROHS3
TL1431CD	STMicroelectronics	2.5V	36V	100 mA	±0.4%	90ppm/°C	1 mA	-20°C ~ 70°C	Obsolete	ROHS3

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): TL431CDR2G is the optimal substitute for TL431CDG. Both parts share identical electrical specifications (2.495V output, ±2.2% tolerance, 50ppm/°C temperature coefficient, 0°C ~ 70°C operating range) and package form factor. TL431CDR2G is active in production with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Secondary Substitutes (Functional Equivalents): TL431CDT (STMicroelectronics) provides functional equivalence with matching output voltage, tolerance, and temperature coefficient. Active product status and ROHS3 compliance support production continuity.

KA431DTF (onsemi) offers tighter tolerance (±2%) and extended temperature range (-25°C ~ 85°C) while maintaining identical current ratings and package specifications. Active status and ROHS3 compliance make this suitable for applications requiring improved accuracy.

Enhanced Performance Alternatives: LM431CIMX delivers superior tolerance (±0.5%) with identical output voltage and current specifications. Active status and ROHS3 compliance support precision applications, though extended temperature range (-40°C ~ 85°C) exceeds the original specification.

TL1431AIDT provides the tightest tolerance (±0.25%) with extended operating range (-40°C ~ 105°C), suitable for high-precision voltage reference applications. Cathode current differs (700 µA vs. 1 mA), requiring circuit validation.

Avoid: LM431AIMX lacks RoHS3 compliance and carries REACH-affected status, unsuitable for new designs requiring current regulatory standards.

TL431CD and TL1431CD are obsolete products; active alternatives are preferred.

Frequently Asked Questions (FAQ)

Q: Can TL431CDR2G directly replace TL431CDG without circuit modification? A: Yes. TL431CDR2G maintains identical electrical specifications and 8-SOIC package form factor. The only difference is product status (active vs. obsolete) and packaging format (Tape & Reel vs. standard). No circuit redesign is required.

Q: What is the difference between TL431 and TL1431 series? A: Both are adjustable shunt voltage references with identical output ranges and current ratings. TL1431 variants offer tighter tolerance (±0.25% to ±0.4%) and different temperature coefficients compared to TL431 series. Selection depends on precision requirements and operating temperature range.

Q: Does tolerance affect circuit performance? A: Tolerance determines the accuracy of the reference voltage. Tighter tolerance (±0.5%, ±0.25%) reduces output voltage variation across manufacturing batches and temperature ranges. Applications requiring precise voltage regulation benefit from lower tolerance values. Looser tolerance (±2.2%) is acceptable for general-purpose regulation where ±2.2% accuracy meets system requirements.

Q: Are all substitutes available in 8-SOIC package? A: Yes. All listed substitutes use 8-SOIC (0.154", 3.90mm Width) surface-mount packaging, ensuring PCB layout compatibility with TL431CDG designs.

Q: What is the significance of cathode current differences? A: Cathode current (1 mA typical for TL431CDG) represents the minimum operating current. Parts with lower cathode current (600 µA, 700 µA) may reduce power consumption in low-current applications but require verification that external circuit bias current exceeds the minimum specification.

Q: Why is RoHS3 compliance important? A: RoHS3 compliance ensures the component meets current environmental and hazardous substance restrictions required by most OEMs and regulatory bodies. Non-compliant parts may face supply chain restrictions or require special approval for new designs.

Q: Can I use a substitute with extended temperature range in a 0°C ~ 70°C application? A: Yes. Extended temperature range parts (e.g., -40°C ~ 85°C) are backward-compatible with narrower operating windows. The component will function correctly within the original 0°C ~ 70°C specification. Extended range provides design flexibility for future applications without component change.

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