TL431ACLPX Equivalent & Substitute Parts

Part Overview

The TL431ACLPX is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a fixed output voltage of 2.495V with a maximum output of 36V and supports 100 mA output current. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the same functional characteristics while offering improved availability, enhanced specifications, or extended operating ranges.

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 (TO-226AA) Formed Leads

Substitute Part Grouping Explanation

Substitution for the TL431ACLPX is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Min/Fixed): 2.495V (or 2.5V for parametric equivalents)
Voltage - Output (Max): 36V
Current - Output: 100 mA
Package / Case: TO-92-3 (TO-226AA) Formed Leads
Mounting Type: Through Hole

Tolerance Variations: Substitute parts are grouped by tolerance specifications. The main part specifies ±1% tolerance. Parts with tighter tolerances (±0.4%, ±0.5%) are direct upgrades. Parts with wider tolerances (±2.2%) remain functionally equivalent for applications where precision is not critical.

Temperature Operating Range: The main part operates from -25°C to 85°C. Substitute parts with extended ranges (-40°C to 105°C) provide enhanced performance across broader environmental conditions.

Cathode Current: The main part specifies 1 mA cathode current. Substitute parts with 700 µA cathode current represent improved efficiency variants.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Coefficient	Operating Temp	Cathode Current	Product Status	Packaging
TL431ACLPX	onsemi	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	Obsolete	Through Hole
TL431BILPRAG	onsemi	±0.4%	50ppm/°C	-40°C ~ 85°C	1 mA	Active	Cut Tape (CT)
TL431ILPRAG	onsemi	±2.2%	50ppm/°C	-40°C ~ 85°C	1 mA	Active	Cut Tape (CT)
TL431ILPRPG	onsemi	±2.2%	50ppm/°C	-40°C ~ 85°C	1 mA	Active	Cut Tape (CT)
FAN431AZXA	Fairchild Semiconductor	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	Active	Bulk
KA431AZTA	onsemi	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	Active	Cut Tape (CT)
LM431BCZX	onsemi	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	Active	Cut Tape (CT)
LM431BCZXA	onsemi	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	Active	Cut Tape (CT)
TL431AIZ-AP	STMicroelectronics	±1%	Not specified	-40°C ~ 105°C	700 µA	Active	Cut Tape (CT)
TL431AIZT	STMicroelectronics	±1%	Not specified	-40°C ~ 105°C	700 µA	Active	Cut Tape (CT)
AS431AZTR-E1	Diodes Incorporated	±0.5%	20ppm/°C	-40°C ~ 125°C	1 mA	Active	Cut Tape (CT)

Engineering Selection Recommendations

Direct Replacement (Same Specifications): KA431AZTA, LM431BCZX, and LM431BCZXA are direct replacements for the TL431ACLPX. All three parts are manufactured by onsemi, maintain ±1% tolerance, 50ppm/°C temperature coefficient, and operate within the -25°C to 85°C range. These parts are active products with RoHS3 compliance and high inventory availability.

Upgraded Tolerance (Tighter Specifications): TL431BILPRAG offers ±0.4% tolerance compared to the original ±1%, providing enhanced precision for applications requiring tighter voltage regulation. This part extends the operating temperature range to -40°C and maintains 1 mA cathode current.

Extended Temperature Range: TL431AIZ-AP and TL431AIZT, manufactured by STMicroelectronics, extend the operating temperature range to -40°C to 105°C while maintaining ±1% tolerance. These parts feature reduced cathode current (700 µA) and are suitable for applications requiring enhanced thermal performance.

Cross-Manufacturer Equivalents: FAN431AZXA (Fairchild Semiconductor) and AS431AZTR-E1 (Diodes Incorporated) provide parametric equivalence with identical electrical specifications. AS431AZTR-E1 offers superior tolerance (±0.5%) and extended temperature range (-40°C to 125°C) with improved temperature coefficient (20ppm/°C).

Lower Precision Applications: TL431ILPRAG and TL431ILPRPG are suitable for applications where ±2.2% tolerance is acceptable, offering cost optimization while maintaining all other critical parameters.

Frequently Asked Questions (FAQ)

Q: Can I use TL431BILPRAG as a direct replacement for TL431ACLPX? A: Yes. TL431BILPRAG is a direct substitute with improved tolerance (±0.4% vs ±1%) and extended temperature range (-40°C to 85°C vs -25°C to 85°C). All critical electrical parameters match the original specification.

Q: What is the difference between TL431ILPRAG and TL431ILPRPG? A: Both parts are electrically identical with ±2.2% tolerance and -40°C to 85°C operating range. The difference lies in packaging designation and supplier device package coding. Both are functionally equivalent for circuit applications.

Q: Are STMicroelectronics TL431AIZ-AP and TL431AIZT suitable replacements? A: Yes, with considerations. Both parts maintain ±1% tolerance and TO-92-3 package compatibility. They feature extended temperature range (-40°C to 105°C) and reduced cathode current (700 µA). These characteristics make them suitable for applications requiring enhanced thermal performance.

Q: How does AS431AZTR-E1 compare to the original TL431ACLPX? A: AS431AZTR-E1 is a parametric equivalent manufactured by Diodes Incorporated. It offers superior tolerance (±0.5% vs ±1%), improved temperature coefficient (20ppm/°C vs 50ppm/°C), and extended operating range (-40°C to 125°C). The output voltage is specified as 2.5V instead of 2.495V, which is within acceptable parametric tolerance for shunt reference applications.

Q: Can I substitute parts with different tolerance ratings? A: Yes, provided the application requirements permit. Tighter tolerance parts (±0.4%, ±0.5%) are direct upgrades. Wider tolerance parts (±2.2%) are suitable only for applications where precision is not critical. Verify circuit design requirements before substitution.

Q: What packaging options are available? A: All substitute parts maintain the TO-92-3 (TO-226AA) through-hole package with formed leads. Packaging variations include Cut Tape (CT), Bulk, and original Through Hole configurations. Select based on procurement and assembly requirements.

Q: Is the TL431ACLPX still available? A: The TL431ACLPX is classified as obsolete. Active substitute parts with equivalent or superior specifications are recommended for new designs and ongoing production.

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