TL431BCDRG4 Equivalent & Substitute Parts

Part Overview

The TL431BCDRG4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This device provides a fixed output voltage of 2.495V with a maximum output of 36V, supporting 100 mA output current with ±0.5% tolerance. The part is classified as discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431BCDRG4
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Current - Cathode	600 µA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the TL431BCDRG4 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt (all substitutes must be shunt-type voltage references)
Output Type: Adjustable (maintains circuit design compatibility)
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 and Performance Considerations:

Tolerance: ±0.5% or better (tighter tolerance acceptable)
Current - Cathode: 600 µA or lower (lower values acceptable)
Operating Temperature: 0°C ~ 70°C minimum range (extended ranges acceptable)

Compliance Requirements:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped by tolerance grade and operating temperature range, as these parameters define the precision and environmental suitability of each alternative.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Package	Product Status
TL431BCDRG4	Texas Instruments	2.495V	36V	100 mA	±0.5%	600 µA	0°C ~ 70°C	8-SOIC	Discontinued
TL431BCDR	Texas Instruments	2.495V	36V	100 mA	±0.5%	600 µA	0°C ~ 70°C	8-SOIC	Active
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	1 mA	-25°C ~ 85°C	8-SOIC	Active
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	8-SOIC	Active
NCV431AIDR2G	onsemi	2.495V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	8-SOIC	Active
TL1431ACDT	STMicroelectronics	2.5V	36V	100 mA	±0.25%	600 µA	-20°C ~ 70°C	8-SOIC	Active
TL1431AIDT	STMicroelectronics	2.5V	36V	100 mA	±0.25%	700 µA	-40°C ~ 105°C	8-SOIC	Active
TL1431CDT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-20°C ~ 70°C	8-SOIC	Active
TL1431IDT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 105°C	8-SOIC	Active
TL1431IYDT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	8-SOIC	Active
TL431ACDG	onsemi	2.495V	36V	100 mA	±1%	1 mA	0°C ~ 70°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): TL431BCDR is the direct equivalent to TL431BCDRG4, offering identical electrical specifications with the same ±0.5% tolerance, 600 µA cathode current, and 0°C ~ 70°C operating range. This part is currently active and represents the primary substitution path.

Tolerance-Based Selection: Parts with tighter tolerance (±0.25%) include TL1431ACDT and TL1431AIDT from STMicroelectronics. These provide improved voltage regulation accuracy and are suitable for applications requiring higher precision. TL1431ACDT maintains the original 0°C ~ 70°C temperature range, while TL1431AIDT extends to -40°C ~ 105°C.

Extended Temperature Range Options: For applications requiring broader operating temperature coverage, NCV431AIDR2G (-40°C ~ 125°C) and TL1431IYDT (-40°C ~ 125°C) provide automotive-grade qualification with AEC-Q100 certification. These parts maintain 100 mA output current and 36V maximum voltage specifications.

Moderate Tolerance Alternatives: LM431BCMX and TL431ACDG offer ±1% tolerance with extended temperature ranges (-25°C ~ 85°C and 0°C ~ 70°C respectively), providing a balance between precision and environmental capability.

Lower Precision Alternative: KA431DTF from onsemi provides ±2% tolerance with extended temperature range (-25°C ~ 85°C). This part is suitable only for applications where ±2% voltage accuracy is acceptable.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and 8-SOIC surface mount packaging.

Frequently Asked Questions (FAQ)

Q: Can I use TL431BCDR as a direct replacement for TL431BCDRG4? A: Yes. TL431BCDR is electrically and mechanically identical to TL431BCDRG4, with matching ±0.5% tolerance, 600 µA cathode current, and 0°C ~ 70°C operating temperature. The primary difference is packaging format (Tape & Reel vs. standard packaging) and active product status.

Q: What is the difference between TL1431 and TL431 series parts? A: Both are shunt voltage reference ICs with identical output voltage ranges (2.495V to 36V) and 100 mA output current. The primary differences are manufacturer (STMicroelectronics vs. Texas Instruments/onsemi), tolerance grades, and temperature coefficients. Electrical functionality is equivalent.

Q: Can I substitute a part with ±0.25% tolerance for the original ±0.5% part? A: Yes. Tighter tolerance is a direct upgrade and maintains full compatibility. Parts like TL1431ACDT and TL1431AIDT provide improved voltage regulation accuracy without circuit modification.

Q: What does the cathode current specification mean for substitution? A: Cathode current (600 µA to 1 mA in this series) represents the minimum operating current required for proper device function. Lower cathode current values are acceptable substitutes. Higher values require circuit verification to ensure adequate bias current availability.

Q: Are automotive-grade parts (NCV431AIDR2G, TL1431IYDT) suitable for non-automotive applications? A: Yes. Automotive-grade parts with AEC-Q100 qualification meet or exceed commercial-grade specifications and are fully compatible with standard industrial and consumer applications. Extended temperature range (-40°C ~ 125°C) provides additional environmental margin.

Q: Does the 8-SOIC package remain consistent across all substitutes? A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring PCB layout and footprint compatibility without design modification.

Q: What is the impact of different operating temperature ranges on part selection? A: Operating temperature range defines the environmental conditions where the part maintains specified electrical characteristics. The original TL431BCDRG4 operates 0°C ~ 70°C. Extended range parts (-40°C ~ 125°C) are suitable for wider temperature applications but are not required for standard 0°C ~ 70°C environments.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, meeting current environmental and reliability standards.

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