TL431BCDR2G Equivalent & Substitute Parts

Part Overview

The TL431BCDR2G is a shunt voltage reference IC manufactured by onsemi, designed for precision voltage regulation and reference applications. This adjustable reference operates across a 2.495V to 36V output range with ±0.4% tolerance and 100 mA output capability in an 8-SOIC surface mount package. The device is currently active in production and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and operational parameters to ensure seamless integration in voltage reference circuits.

Key Parameters

Parameter	TL431BCDR2G
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.4%
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
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the TL431BCDR2G is determined by the following critical parameters:

Primary Matching Criteria:

Reference Type: Shunt (all candidates match)
Output Type: Adjustable (all candidates match)
Package / Case: 8-SOIC form factor (all candidates match)
Voltage Output Range: Minimum 2.495V to 2.5V, Maximum 36V to 37V
Current - Output: 100 mA (all candidates match)
Mounting Type: Surface Mount (all candidates match)

Secondary Compatibility Factors:

Tolerance: ±0.4% to ±2% acceptable range
Temperature Coefficient: 50ppm/°C to 90ppm/°C
Operating Temperature: Overlap with 0°C ~ 70°C minimum
Current - Cathode: 600 µA to 1 mA
RoHS and REACH compliance status

Substitutes are grouped into three categories: Direct Equivalents (matching tolerance and voltage specifications), Similar Alternatives (broader tolerance or temperature range), and Upgrade Options (extended temperature performance).

Parameter Comparison

Part Number	Manufacturer	Voltage Min	Voltage Max	Tolerance	Temp Coeff	Operating Temp	Cathode Current	Status	RoHS
TL431BCDR2G	onsemi	2.495V	36V	±0.4%	50ppm/°C	0°C ~ 70°C	1 mA	Active	ROHS3
TL1431CDR	Texas Instruments	2.5V	36V	±0.4%	—	0°C ~ 70°C	1 mA	Active	ROHS3
TL431BCDR	Texas Instruments	2.495V	36V	±0.5%	—	0°C ~ 70°C	600 µA	Active	ROHS3
TL1431MDREP	Texas Instruments	2.5V	36V	±0.4%	—	-55°C ~ 125°C	1 mA	Active	ROHS3
TL1431QD	Texas Instruments	2.5V	36V	±0.4%	—	-40°C ~ 125°C	1 mA	Active	ROHS3
TL1431CD	STMicroelectronics	2.5V	36V	±0.4%	90ppm/°C	-20°C ~ 70°C	1 mA	Obsolete	ROHS3
LM431BCMX	National Semiconductor	2.495V	36V	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	Active	Undefined
LM431CIMX	onsemi	2.495V	36V	±0.5%	50ppm/°C	-40°C ~ 85°C	1 mA	Active	ROHS3
LM431AIMX	National Semiconductor	2.5V	36V	±2%	50ppm/°C	-40°C ~ 85°C	1 mA	Active	Non-compliant
LM431CCMX	Texas Instruments	2.5V	37V	-0.6%, +0.4%	50ppm/°C	0°C ~ 70°C	1 mA	Obsolete	ROHS3
KA431DTF	onsemi	2.5V	36V	±2%	50ppm/°C	-25°C ~ 85°C	1 mA	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Preferred for Drop-In Replacement):

TL1431CDR and TL431BCDR2G share identical electrical specifications (±0.4% tolerance, 2.495V–36V output, 100 mA capability) and operating temperature range (0°C ~ 70°C). Both are active products with ROHS3 compliance. TL1431CDR is manufactured by Texas Instruments and available in higher inventory (35,200 units), making it the primary equivalent choice.

High-Precision Alternatives (±0.4% Tolerance):

TL1431MDREP and TL1431QD maintain ±0.4% tolerance matching the main part but extend operating temperature to -55°C ~ 125°C and -40°C ~ 125°C respectively. These upgrades are suitable for applications requiring wider temperature performance while preserving precision specifications. Both are active products with ROHS3 compliance.

Tolerance-Relaxed Alternatives (±0.5% to ±2%):

LM431CIMX (±0.5%, onsemi) and LM431BCMX (±1%, National Semiconductor) provide acceptable substitution for applications tolerating broader voltage reference accuracy. LM431CIMX extends operating temperature to -40°C ~ 85°C. LM431AIMX and KA431DTF offer ±2% tolerance with extended temperature ranges but require verification of system tolerance requirements.

Obsolete Parts (Not Recommended for New Designs):

TL1431CD (STMicroelectronics) and LM431CCMX (Texas Instruments) are marked obsolete and should not be selected for new production designs despite meeting electrical specifications.

Compliance Considerations:

All recommended active substitutes maintain ROHS3 compliance. LM431AIMX is RoHS non-compliant and REACH-affected; selection requires regulatory verification. LM431BCMX has undefined MSL status; contact manufacturer for moisture sensitivity requirements.

Frequently Asked Questions (FAQ)

Q: Can TL1431CDR directly replace TL431BCDR2G?

A: Yes. Both devices share identical tolerance (±0.4%), output voltage range (2.495V–36V minimum, 36V maximum), current capability (100 mA), and operating temperature (0°C ~ 70°C). The 8-SOIC package is identical. TL1431CDR is manufactured by Texas Instruments and is actively produced.

Q: What is the difference between TL431BCDR and TL431BCDR2G?

A: The provided data indicates TL431BCDR (Texas Instruments) has ±0.5% tolerance and 600 µA cathode current, while TL431BCDR2G (onsemi) specifies ±0.4% tolerance and 1 mA cathode current. These differences may affect circuit performance in precision applications. Verify cathode current requirements before substitution.

Q: Are LM431 series parts compatible with TL431BCDR2G?

A: LM431 series parts share the same 8-SOIC package and adjustable shunt reference architecture. Compatibility depends on tolerance requirements. LM431CIMX (±0.5%) and LM431BCMX (±1%) are acceptable for applications tolerating broader accuracy. LM431AIMX (±2%) is suitable only for less stringent applications. Verify RoHS compliance; LM431AIMX is non-compliant.

Q: Can I use KA431DTF as a substitute?

A: KA431DTF is electrically compatible (8-SOIC package, 100 mA output, 36V maximum) but specifies ±2% tolerance versus TL431BCDR2G's ±0.4%. Use only in applications where ±2% voltage reference accuracy is acceptable. KA431DTF extends operating temperature to -25°C ~ 85°C and is ROHS3 compliant.

Q: What are the temperature range implications for substitution?

A: TL431BCDR2G operates 0°C ~ 70°C. Substitutes with identical ranges (TL1431CDR, LM431CCMX) are direct replacements. Extended-range parts (TL1431MDREP: -55°C ~ 125°C; TL1431QD: -40°C ~ 125°C) are suitable for wider environmental conditions. Narrower-range parts are not recommended unless application temperature is guaranteed within their limits.

Q: Is packaging different between substitute parts?

A: All listed substitutes use 8-SOIC (0.154", 3.90mm Width) surface mount packages. Packaging is identical across all candidates. Differences exist only in tape & reel, bulk, tube, or cut tape configurations; these affect handling and storage but not electrical compatibility or PCB footprint.

Q: Should I consider obsolete parts like TL1431CD?

A: No. TL1431CD (STMicroelectronics) and LM431CCMX (Texas Instruments) are marked obsolete. While electrically compatible, obsolete parts present supply chain risk and should not be selected for new designs. Use active products: TL1431CDR, TL1431MDREP, or TL1431QD.

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