TL431ACLPRP Equivalent & Substitute Parts

Part Overview

The TL431ACLPRP is a shunt voltage reference IC manufactured by onsemi, classified as a Power Management (PMIC) component. This adjustable reference provides a 2.495V to 36V output with ±1% tolerance and 100 mA output current capability in a TO-92-3 package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain identical electrical specifications while offering active product status and improved availability.

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	0°C ~ 70°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on electrical and mechanical compatibility with the TL431ACLPRP:

Upgrade Parts maintain all critical electrical parameters (2.495V to 36V output, ±1% tolerance, 100 mA output, TO-92-3 package) while offering active product status and improved compliance. These parts are direct functional replacements with identical pin configuration and electrical performance.

Similar Parts maintain core electrical specifications but differ in tolerance (±0.5% vs ±1%), providing enhanced accuracy for applications requiring tighter voltage reference performance. These parts are functionally compatible but offer superior precision.

Direct Parts are equivalent models from alternative manufacturers or packaging variants that maintain identical electrical and mechanical specifications, including operating temperature ranges and cathode current ratings. These parts provide cross-manufacturer compatibility.

Critical parameters determining substitution eligibility:

Reference Type: Shunt (fixed)
Output Type: Adjustable (fixed)
Voltage range: 2.495V to 36V (fixed)
Output current: 100 mA (fixed)
Tolerance: ±1% or better (fixed)
Package: TO-92-3 (fixed)
Mounting: Through Hole (fixed)

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output (Min/Max)	Tolerance	Current Output	Operating Temp	Cathode Current	RoHS Status
TL431ACLPRP	onsemi	Obsolete	2.495V / 36V	±1%	100 mA	0°C ~ 70°C	1 mA	Non-compliant
FAN431AZXA	Fairchild Semiconductor	Active	2.495V / 36V	±1%	100 mA	-25°C ~ 85°C	1 mA	Not specified
LM431BCZX	onsemi	Active	2.495V / 36V	±1%	100 mA	-25°C ~ 85°C	1 mA	ROHS3 Compliant
LM431BIZX	onsemi	Active	2.495V / 36V	±1%	100 mA	-40°C ~ 85°C	1 mA	ROHS3 Compliant
KA431LZTA	onsemi	Active	2.495V / 36V	±0.5%	100 mA	-25°C ~ 85°C	1 mA	ROHS3 Compliant
TL431ACLPM	Texas Instruments	Active	2.495V / 36V	±1%	100 mA	0°C ~ 70°C	600 µA	ROHS3 Compliant
TL431ACLPR	Texas Instruments	Active	2.495V / 36V	±1%	100 mA	0°C ~ 70°C	600 µA	ROHS3 Compliant
TL431ACLPRPG	onsemi	Active	2.495V / 36V	±1%	100 mA	0°C ~ 70°C	1 mA	ROHS3 Compliant
TL431ACZ-AP	STMicroelectronics	Active	2.495V / 36V	±1%	100 mA	0°C ~ 70°C	600 µA	ROHS3 Compliant
TL431ACZT	STMicroelectronics	Active	2.495V / 36V	±1%	100 mA	0°C ~ 70°C	600 µA	ROHS3 Compliant
TL431AIZ-AP	STMicroelectronics	Active	2.495V / 36V	±1%	100 mA	-40°C ~ 105°C	700 µA	ROHS3 Compliant

Engineering Selection Recommendations

For Standard Applications (0°C to 70°C Operating Range): TL431ACLPRPG, TL431ACLPM, TL431ACLPR, TL431ACZ-AP, and TL431ACZT are direct equivalents maintaining the original operating temperature specification. TL431ACLPRPG offers the closest match with identical cathode current (1 mA) and active product status with ROHS3 compliance.

For Extended Temperature Range Applications (-25°C to 85°C or wider): LM431BCZX, LM431BIZX, FAN431AZXA, and TL431AIZ-AP provide expanded operating temperature ranges. LM431BIZX extends to -40°C to 85°C and maintains ROHS3 compliance. TL431AIZ-AP offers the widest temperature range (-40°C to 105°C) with active status and ROHS3 compliance.

For Enhanced Voltage Reference Accuracy: KA431LZTA provides ±0.5% tolerance versus the standard ±1%, delivering superior voltage reference precision while maintaining all other electrical and mechanical specifications. This part is suitable for applications requiring tighter output voltage control.

Compliance Considerations: All substitute parts except FAN431AZXA carry ROHS3 compliance certification. The original TL431ACLPRP is RoHS non-compliant. For new designs or production requiring RoHS compliance, any listed substitute part satisfies regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use TL431ACLPRPG as a direct replacement for TL431ACLPRP? A: Yes. TL431ACLPRPG maintains identical electrical specifications (2.495V to 36V output, ±1% tolerance, 100 mA output current, 1 mA cathode current) and package configuration (TO-92-3). The primary difference is active product status and ROHS3 compliance versus the obsolete, non-compliant original part.

Q: What is the difference between parts with 1 mA and 600 µA cathode current ratings? A: Cathode current represents the minimum operating current required at the reference cathode. Parts rated at 600 µA require less bias current than 1 mA variants. Both are electrically compatible in the same circuit topology, but designs optimized for the original 1 mA specification should use parts maintaining this rating (TL431ACLPRPG, LM431BCZX, LM431BIZX, KA431LZTA, FAN431AZXA).

Q: Is KA431LZTA compatible with designs using TL431ACLPRP? A: Yes, with the advantage of improved accuracy. KA431LZTA maintains identical voltage output range (2.495V to 36V), output current (100 mA), and TO-92-3 package. The ±0.5% tolerance provides tighter voltage reference performance compared to the original ±1% specification, making it suitable for applications requiring enhanced precision.

Q: Which substitute part offers the widest operating temperature range? A: TL431AIZ-AP operates from -40°C to 105°C, providing the broadest temperature coverage. For applications requiring extended low-temperature operation, LM431BIZX (-40°C to 85°C) is also available. Standard temperature range (0°C to 70°C) variants include TL431ACLPRPG, TL431ACLPM, TL431ACLPR, TL431ACZ-AP, and TL431ACZT.

Q: Are all substitute parts available in the same TO-92-3 package? A: Yes. All listed substitute parts use TO-226-3 / TO-92-3 (TO-226AA) formed leads package configuration, ensuring mechanical and pin compatibility with the original TL431ACLPRP.

Q: What is the inventory status of substitute parts? A: LM431BIZX offers the highest inventory (10,400 pcs), followed by KA431LZTA (25,300 pcs). TL431ACLPM from Texas Instruments provides substantial availability (666,866 pcs). All listed parts are in active production with new original stock available.

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