TL431ACLP Equivalent & Substitute Parts

Part Overview

The TL431ACLP is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a 2.495V adjustable output with ±1% tolerance and supports up to 100 mA output current in a TO-92-3 package. The part 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)	36V
Current - Output	100 mA
Tolerance	±1%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3

Substitute Part Grouping Explanation

Substitution for the TL431ACLP is determined by the following critical parameters: reference type (shunt), output type (adjustable), voltage output range (2.495V minimum to 36V maximum), current output capability (100 mA), tolerance specification (±1%), and package compatibility (TO-92-3). Parts are grouped into categories based on their relationship to the main part: direct manufacturer equivalents with identical specifications, similar parts with minor parameter variations, parametric equivalents from alternative manufacturers, and upgraded versions with enhanced performance or extended operating ranges.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output (Min)	Tolerance	Operating Temp	Current - Cathode	Package
TL431ACLP	onsemi	Obsolete	2.495V	±1%	-25°C ~ 85°C	1 mA	TO-92-3
TL431ACLPG	onsemi	Active	2.495V	±1%	0°C ~ 70°C	1 mA	TO-92-3
TL431BILPG	onsemi	Active	2.495V	±0.4%	-40°C ~ 85°C	1 mA	TO-92-3
TL431ILPG	onsemi	Active	2.495V	±2.2%	-40°C ~ 85°C	1 mA	TO-92-3
KA431AZBU	Fairchild Semiconductor	Active	2.495V	±1%	-25°C ~ 85°C	1 mA	TO-92-3
LM431AIZ	Fairchild Semiconductor	Active	2.5V	±2%	-40°C ~ 85°C	1 mA	TO-92-3
TL431AIZ	STMicroelectronics	Active	2.495V	±1%	-40°C ~ 105°C	700 µA	TO-92-3
LT1431CZ#PBF	Analog Devices Inc.	Active	2.5V	±0.4%	0°C ~ 70°C	1 mA	TO-92-3
LT1431IZ#PBF	Analog Devices Inc.	Active	2.5V	±0.4%	-40°C ~ 85°C	1 mA	TO-92-3
TL1431ACZ	STMicroelectronics	Active	2.5V	±0.25%	-20°C ~ 70°C	600 µA	TO-92-3

Engineering Selection Recommendations

For direct replacement of the obsolete TL431ACLP, the TL431ACLPG from onsemi provides identical electrical specifications with active product status and RoHS3 compliance. This part maintains the same 2.495V output, ±1% tolerance, and 100 mA current capability, though with a narrower operating temperature range (0°C ~ 70°C versus -25°C ~ 85°C).

The TL431AIZ from STMicroelectronics offers an upgraded alternative with extended operating temperature range (-40°C ~ 105°C) and active product status with RoHS3 compliance. This part matches the core electrical specifications while providing improved thermal performance.

The KA431AZBU from Fairchild Semiconductor provides parametric equivalence with identical electrical characteristics and operating temperature range matching the original part (-25°C ~ 85°C).

For applications requiring tighter tolerance specifications, the TL431BILPG (±0.4%) and LT1431 series (±0.4%) from Analog Devices offer improved accuracy while maintaining the same voltage output range and current capability.

Frequently Asked Questions (FAQ)

Q: Can TL431ACLPG be used as a direct replacement for TL431ACLP?

A: Yes. Both parts share identical electrical specifications: 2.495V adjustable output, ±1% tolerance, 100 mA output current, and TO-92-3 package. The primary difference is operating temperature range (0°C ~ 70°C for ACLPG versus -25°C ~ 85°C for ACLP) and product status (active versus obsolete). Verify your application's temperature requirements before substitution.

Q: What is the difference between TL431BILPG and TL431ACLP?

A: The TL431BILPG offers tighter tolerance (±0.4% versus ±1%) and extended operating temperature range (-40°C ~ 85°C versus -25°C ~ 85°C). Both maintain 2.495V output and 100 mA current capability in TO-92-3 packages. The improved tolerance makes BILPG suitable for precision voltage reference applications.

Q: Are LT1431 parts from Analog Devices compatible with TL431ACLP?

A: LT1431 parts are functionally compatible as adjustable shunt voltage references in TO-92-3 packages with 100 mA output current. However, they specify 2.5V minimum output (versus 2.495V) and offer ±0.4% tolerance. Operating temperature ranges vary by grade. Verify exact voltage and tolerance requirements for your application.

Q: Why does TL431AIZ from STMicroelectronics show lower cathode current (700 µA versus 1 mA)?

A: The TL431AIZ maintains the same functional performance as a shunt voltage reference with identical output voltage and tolerance specifications. The lower cathode current specification indicates improved efficiency in the reference circuit design while preserving all critical electrical parameters for substitution.

Q: Can I use parts with different tolerance specifications interchangeably?

A: Parts with different tolerances (±0.25%, ±0.4%, ±1%, ±2%) are electrically compatible but produce different voltage accuracy. Select tolerance based on your circuit's precision requirements. Tighter tolerance parts (±0.4% or better) are suitable for precision applications; standard tolerance (±1%) is adequate for general voltage regulation.

Q: What package considerations apply to these substitutes?

A: All listed substitutes use TO-92-3 or TO-226-3 packages, which are physically and electrically compatible. Verify PCB layout and lead spacing match your design. Some parts specify "Long Body" variants; confirm physical dimensions if space is constrained.

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