TL431BCLPG Equivalent & Substitute Parts

Part Overview

The TL431BCLPG is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component features a 2.495V adjustable output with ±0.4% tolerance and supports output currents up to 100 mA in a TO-92-3 package. The product is currently 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)	36 V
Current - Output	100 mA
Tolerance	±0.4%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	TO-226-3, TO-92-3 Long Body
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TL431BCLPG is determined by the following critical parameters:

Reference Type: Shunt voltage reference
Output Type: Adjustable output capability
Voltage Range: 2.495V minimum output to 36V maximum
Current Rating: 100 mA output current capability
Tolerance: ±0.4% accuracy specification
Package: TO-92-3 through-hole configuration
Temperature Range: 0°C to 70°C operating window

Substitute parts must maintain compatibility across these core electrical and mechanical specifications. Parts are grouped by tolerance grade and temperature range, as these parameters directly impact circuit performance and application suitability.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp	Package	Status
TL431BCLPG	onsemi	2.495V	36 V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	TO-92-3	Obsolete
KA431AZBU	Fairchild Semiconductor	2.495V	36 V	100 mA	±1%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Active
LM431AIZ	Fairchild Semiconductor	2.5V	36 V	100 mA	±2%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
LT1431CZ#PBF	Analog Devices Inc.	2.5V	36 V	100 mA	±0.4%	30ppm/°C	0°C ~ 70°C	TO-92-3	Active
LT1431IZ#PBF	Analog Devices Inc.	2.5V	36 V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
TL1431ACZ	STMicroelectronics	2.5V	36 V	100 mA	±0.25%	90ppm/°C	-20°C ~ 70°C	TO-92-3	Active
TL1431CLP	Texas Instruments	2.5V	36 V	100 mA	±0.4%	—	0°C ~ 70°C	TO-92-3	Active
TL1431CLPE3	Texas Instruments	2.5V	36 V	100 mA	±0.4%	—	0°C ~ 70°C	TO-92-3	Obsolete
TL1431IZ	STMicroelectronics	2.5V	36 V	100 mA	±0.4%	100ppm/°C	-40°C ~ 105°C	TO-92-3	Active
TL431ACLP	onsemi	2.495V	36 V	100 mA	±1%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Obsolete
TL431ACLPE3	Texas Instruments	2.495V	36 V	100 mA	±1%	—	0°C ~ 70°C	TO-92-3	Obsolete

Engineering Selection Recommendations

Direct Equivalents (±0.4% Tolerance, Active Status)

LT1431CZ#PBF and TL1431CLP are the primary active substitutes for TL431BCLPG. Both maintain ±0.4% tolerance specification and TO-92-3 packaging. LT1431CZ#PBF is manufactured by Analog Devices Inc. with ROHS3 compliance and MSL rating of 1. TL1431CLP is manufactured by Texas Instruments with ROHS3 compliance and Not Applicable MSL rating. Both support the 0°C to 70°C operating temperature range of the original part.

Extended Temperature Range Alternative

LT1431IZ#PBF provides ±0.4% tolerance with extended operating range (-40°C to 85°C), manufactured by Analog Devices Inc. with ROHS3 compliance. This part is suitable for applications requiring broader temperature performance while maintaining the same accuracy specification.

Tighter Tolerance Option

TL1431ACZ, manufactured by STMicroelectronics, offers ±0.25% tolerance with ROHS3 compliance. This part provides superior accuracy for precision voltage reference applications, though operating temperature range is -20°C to 70°C.

Lower Tolerance Alternatives

KA431AZBU (Fairchild Semiconductor, ±1%) and LM431AIZ (Fairchild Semiconductor, ±2%) are active substitutes with relaxed tolerance specifications. These parts support extended temperature ranges and are suitable for applications where ±0.4% accuracy is not required.

All recommended substitutes maintain 100 mA output current, 36V maximum voltage, and TO-92-3 through-hole packaging. Selection should be based on specific tolerance, temperature range, and compliance requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with ±1% tolerance instead of ±0.4%?

A: Yes, if your circuit design tolerates the wider accuracy specification. KA431AZBU and TL431ACLPE3 provide ±1% tolerance. However, this will affect voltage regulation precision and may require circuit recalibration.

Q: What is the difference between 2.495V and 2.5V output specifications?

A: The TL431BCLPG specifies 2.495V minimum output, while many substitutes specify 2.5V. Both values fall within the adjustable reference range and are functionally compatible for most applications. Verify your specific circuit requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All listed active substitutes carry ROHS3 compliance certification. Obsolete parts (TL1431CLPE3, TL431ACLP, TL431ACLPE3) also maintain ROHS3 compliance.

Q: Can I use a part with a different operating temperature range?

A: Yes, if your application operates within the substitute part's temperature range. LT1431IZ#PBF and TL1431IZ support -40°C to 85°C or -40°C to 105°C respectively, providing broader environmental coverage than the original 0°C to 70°C specification.

Q: Are all substitutes available in TO-92-3 package?

A: Yes. All listed substitute parts are available in TO-92-3 through-hole package configuration, ensuring direct mechanical compatibility with TL431BCLPG footprints.

Q: Which substitute has the best temperature coefficient performance?

A: LT1431CZ#PBF features 30ppm/°C temperature coefficient, superior to the original part's 50ppm/°C specification. This provides better voltage stability across temperature variations.

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