TL431BCDR Equivalent & Substitute Parts

Part Overview

The TL431BCDR is an adjustable shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation and reference applications. This 8-SOIC surface mount device operates across a 2.495V to 36V output range with ±0.5% tolerance and supports 100 mA output current. The part is active in production status and fully compliant with RoHS3 and REACH regulations. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements across different tolerance grades and operating temperature ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431BCDR
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
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the TL431BCDR are qualified based on the following critical parameters that determine functional interchangeability:

Core Electrical Parameters:

Reference Type: Shunt (all substitutes maintain shunt topology)
Output Type: Adjustable (all substitutes provide adjustable output)
Voltage Range: 2.495V to 36V output capability (minimum and maximum voltage compatibility)
Current - Output: 100 mA (all substitutes support this current level)
Package / Case: 8-SOIC form factor (all substitutes use identical 8-SOIC 0.154" width package)
Mounting Type: Surface Mount (all substitutes are surface mount compatible)

Tolerance and Performance Grades: Substitutes are grouped by tolerance specification (±0.25%, ±0.4%, ±1%, ±2%), which determines suitability for different precision requirements. Tighter tolerance parts (±0.25%, ±0.4%) are direct upgrades; looser tolerance parts (±2%) are downgrades suitable only when precision requirements permit.

Operating Temperature Range: Substitutes span three temperature grades: commercial (0°C ~ 70°C), industrial (-20°C ~ 85°C), and automotive (-40°C ~ 125°C). Selection depends on application environment and thermal specifications.

Compliance and Certifications: All substitutes maintain RoHS3 compliance and REACH unaffected status. Automotive-qualified parts (NCV431AIDR2G, TL1431IYDT) carry AEC-Q100 certification for automotive applications.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Package	RoHS3
TL431BCDR	Texas Instruments	2.495V	36V	100 mA	±0.5%	600 µA	0°C ~ 70°C	8-SOIC	Yes
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	1 mA	-25°C ~ 85°C	8-SOIC	Yes
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	8-SOIC	Undefined
NCV431AIDR2G	onsemi	2.495V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	8-SOIC	Yes
TL1431ACDT	STMicroelectronics	2.5V	36V	100 mA	±0.25%	600 µA	-20°C ~ 70°C	8-SOIC	Yes
TL1431AIDT	STMicroelectronics	2.5V	36V	100 mA	±0.25%	700 µA	-40°C ~ 105°C	8-SOIC	Yes
TL1431CDT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-20°C ~ 70°C	8-SOIC	Yes
TL1431IDT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 105°C	8-SOIC	Yes
TL1431IYDT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	8-SOIC	Yes
TL431ACDG	onsemi	2.495V	36V	100 mA	±1%	1 mA	0°C ~ 70°C	8-SOIC	Yes
TL431ACDR2G	onsemi	2.495V	36V	100 mA	±1%	1 mA	0°C ~ 70°C	8-SOIC	Yes

Engineering Selection Recommendations

Direct Equivalents (±0.5% Tolerance, Commercial Temperature Range): TL431ACDG and TL431ACDR2G from onsemi provide functional equivalence to the TL431BCDR with matching ±1% tolerance and 0°C ~ 70°C operating range. Both are RoHS3 compliant and maintain the same 2.495V minimum output voltage. Selection between these depends on packaging preference: TL431ACDG is supplied in Tube packaging, while TL431ACDR2G is supplied in Tape & Reel format.

Higher Precision Substitutes (±0.25% to ±0.4% Tolerance): TL1431ACDT, TL1431AIDT, TL1431CDT, TL1431IDT, and TL1431IYDT from STMicroelectronics offer superior tolerance performance. TL1431ACDT and TL1431AIDT provide ±0.25% tolerance; TL1431CDT, TL1431IDT, and TL1431IYDT provide ±0.4% tolerance. These are suitable for applications requiring tighter voltage regulation. TL1431IYDT extends the operating range to -40°C ~ 125°C with automotive AEC-Q100 qualification.

Extended Temperature Range Substitutes: NCV431AIDR2G (onsemi, automotive qualified, -40°C ~ 125°C) and LM431BCMX (National Semiconductor, -25°C ~ 85°C) support wider operating temperature ranges. NCV431AIDR2G carries AEC-Q100 certification for automotive applications and maintains ±1% tolerance with 2.495V minimum output.

Lower Precision Substitute (±2% Tolerance): KA431DTF from onsemi provides the widest operating temperature range (-25°C ~ 85°C) with ±2% tolerance. This part is suitable only for applications where tolerance requirements permit ±2% voltage variation.

Compliance Status: All recommended substitutes maintain RoHS3 compliance and REACH unaffected status. LM431BCMX shows undefined MSL status; verify with supplier if moisture sensitivity classification is critical for your assembly process.

Frequently Asked Questions (FAQ)

Q: Can I substitute TL431BCDR with KA431DTF? A: KA431DTF is functionally compatible in 8-SOIC package and supports the same 100 mA output current and 36V maximum voltage. However, KA431DTF has ±2% tolerance versus TL431BCDR's ±0.5% tolerance. This substitution is valid only if your application tolerates ±2% voltage variation. KA431DTF extends operating temperature to -25°C ~ 85°C, making it suitable for wider temperature environments.

Q: What is the difference between TL1431ACDT and TL1431AIDT? A: Both parts are STMicroelectronics TL1431 variants with ±0.25% tolerance and 8-SOIC package. TL1431ACDT operates 0°C ~ 70°C with 600 µA cathode current; TL1431AIDT operates -40°C ~ 105°C with 700 µA cathode current. Select TL1431AIDT for extended low-temperature applications or industrial environments requiring -40°C operation.

Q: Are automotive-qualified substitutes available? A: Yes. NCV431AIDR2G (onsemi) and TL1431IYDT (STMicroelectronics) are both AEC-Q100 qualified for automotive applications. NCV431AIDR2G operates -40°C ~ 125°C with ±1% tolerance; TL1431IYDT operates -40°C ~ 125°C with ±0.4% tolerance. Both maintain 8-SOIC package compatibility and 100 mA output current.

Q: Does package format affect substitution? A: All substitute parts use the same 8-SOIC (0.154", 3.90mm Width) package, ensuring PCB footprint compatibility. Packaging format (Tape & Reel, Cut Tape, Tube) affects supply and handling but not electrical or mechanical compatibility. Verify your assembly process requirements for packaging format preference.

Q: Which substitute offers the best tolerance performance? A: TL1431ACDT and TL1431AIDT both provide ±0.25% tolerance, the tightest specification among available substitutes. TL1431ACDT is limited to 0°C ~ 70°C; TL1431AIDT extends to -40°C ~ 105°C. For applications requiring ±0.25% precision across extended temperature ranges, TL1431AIDT is the optimal choice.

Q: Can I use LM431BCMX as a direct replacement? A: LM431BCMX is electrically compatible with matching 2.495V minimum output, 36V maximum, 100 mA current, and 8-SOIC package. It provides ±1% tolerance and extends operating temperature to -25°C ~ 85°C. However, MSL status is undefined; confirm moisture sensitivity classification with the supplier before use in moisture-sensitive assembly environments.

Q: What is the cathode current difference, and does it matter? A: Cathode current ranges from 600 µA (TL431BCDR, TL1431ACDT) to 1 mA (most other substitutes). Higher cathode current increases quiescent power consumption. For battery-powered or low-power applications, select parts with lower cathode current (600-700 µA). For general applications, this difference is negligible.

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