TL431BIDR2 Equivalent & Substitute Parts

Part Overview

The TL431BIDR2 is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a stable 2.495V to 36V adjustable output with ±0.4% tolerance and 100 mA output current capability in an 8-SOIC surface mount package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

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	±0.4%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the TL431BIDR2 is determined by the following critical parameters:

Electrical Compatibility Requirements:

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
Tolerance: ±0.4% or better (lower tolerance values are acceptable)
Temperature Coefficient: 50ppm/°C or better
Current - Cathode: 1 mA nominal operation

Mechanical Compatibility Requirements:

Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Substitutes are grouped into three categories:

Direct Equivalents - Identical electrical specifications and packaging, differing only in manufacturer or packaging format
Similar Substitutes - Meet core electrical requirements but with relaxed tolerance or temperature range specifications
Upgrade Substitutes - Enhanced specifications (tighter tolerance, extended temperature range) providing superior performance

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Package	Product Status	RoHS Status
TL431BIDR2	onsemi	2.495V	36V	100 mA	±0.4%	1 mA	-40°C ~ 85°C	8-SOIC	Obsolete	RoHS non-compliant
TL431BIDR2G	onsemi	2.495V	36V	100 mA	±0.4%	1 mA	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	1 mA	-25°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM431AIMX	National Semiconductor	2.5V	36V	100 mA	±2%	1 mA	-40°C ~ 85°C	8-SOIC	Active	RoHS non-compliant
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	8-SOIC	Active	Vendor Undefined
LM431CIMX	onsemi	2.495V	36V	100 mA	±0.5%	1 mA	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
TL431BIDR	Texas Instruments	2.495V	36V	100 mA	±0.5%	700 µA	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
TL1431MDREP	Texas Instruments	2.5V	36V	100 mA	±0.4%	1 mA	-55°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant
TL1431QD	Texas Instruments	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant
TL1431QDR	Texas Instruments	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant
TL1431QDREP	Texas Instruments	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Choice): TL431BIDR2G is the direct equivalent with identical electrical specifications and packaging. This part is manufactured by onsemi, maintains the same ±0.4% tolerance and 2.495V minimum output voltage, and is currently in active production status. The primary advantage is ROHS3 compliance, addressing regulatory requirements where the original TL431BIDR2 does not.

Alternative Direct Equivalent: TL431BIDR (Texas Instruments) provides identical electrical performance with ±0.5% tolerance and the same operating temperature range. This part is ROHS3 compliant and actively produced. The cathode current specification differs at 700 µA versus 1 mA, which does not affect circuit compatibility for standard applications.

Upgrade Options (Enhanced Performance): The TL1431 series (TL1431MDREP, TL1431QD, TL1431QDR, TL1431QDREP) from Texas Instruments offers extended operating temperature range (-40°C to 125°C or -55°C to 125°C) while maintaining ±0.4% tolerance. These parts are suitable for applications requiring enhanced thermal performance and are ROHS3 compliant.

Acceptable Substitutes (Relaxed Specifications): LM431CIMX (onsemi) maintains the 2.495V output minimum and ±0.5% tolerance with full -40°C to 85°C operating range and ROHS3 compliance. KA431DTF and LM431AIMX have relaxed tolerance specifications (±2%) and are suitable only where tolerance requirements permit. LM431BCMX offers ±1% tolerance but has a reduced operating temperature range (-25°C to 85°C).

Frequently Asked Questions (FAQ)

Q: Can I use TL1431QDREP as a direct replacement for TL431BIDR2? A: Yes. Both parts maintain the same 8-SOIC package, 100 mA output current, and ±0.4% tolerance. The TL1431QDREP offers an extended operating temperature range (-40°C to 125°C) and is ROHS3 compliant, making it a superior choice for new designs.

Q: What is the difference between TL431BIDR2 and TL431BIDR2G? A: These parts are electrically identical with matching specifications. The primary difference is packaging format (TL431BIDR2G is supplied in Tape & Reel format) and RoHS compliance status (TL431BIDR2G is ROHS3 compliant). Both are manufactured by onsemi.

Q: Are the KA431DTF and LM431AIMX suitable replacements? A: These parts are compatible from a package and basic functionality perspective but have relaxed tolerance specifications (±2% versus ±0.4%). They are suitable only for applications where the wider tolerance is acceptable. The KA431DTF also has a reduced operating temperature range (-25°C to 85°C).

Q: Why do some substitutes have different minimum output voltages (2.5V vs 2.495V)? A: The 2.5V specification represents a nominal rounded value while 2.495V is the precise minimum specification. Both are functionally equivalent for adjustable reference applications. Circuits designed for 2.495V operation will function with 2.5V parts.

Q: What is the significance of cathode current differences (1 mA vs 700 µA)? A: Cathode current represents the minimum operating current required for stable operation. The TL431BIDR (700 µA) requires less bias current than the standard 1 mA specification, offering improved efficiency in low-power applications. Both values are compatible with standard circuit designs.

Q: Are all substitute parts ROHS3 compliant? A: No. The original TL431BIDR2 and LM431AIMX are RoHS non-compliant. TL431BIDR2G, KA431DTF, LM431CIMX, and all TL1431 variants are ROHS3 compliant. For applications requiring RoHS compliance, select from the compliant options.

Q: Can I use LM431BCMX in a circuit designed for -40°C operation? A: No. LM431BCMX has a minimum operating temperature of -25°C, making it unsuitable for applications requiring -40°C operation. Select TL431BIDR2G, TL431BIDR, LM431AIMX, or TL1431 series parts for full -40°C support.

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