TL431AILPRP Equivalent & Substitute Parts

Part Overview

The TL431AILPRP is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a 2.495V to 36V adjustable output with ±1% tolerance and 100 mA output capability in a TO-92-3 package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across output voltage range, current capacity, tolerance specifications, and mechanical form factor.

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	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility with the TL431AILPRP:

Direct Substitutes maintain identical electrical specifications across all critical parameters: 2.495V to 36V output range, ±1% tolerance, 100 mA output current, 1 mA cathode current, and TO-92-3 package. These parts are pin-compatible and functionally equivalent for circuit-level replacement.

Similar Substitutes share the core electrical characteristics (2.495V to 36V output, ±1% tolerance, 100 mA output, TO-92-3 package) but may differ in operating temperature range, cathode current specifications, or product status. These parts are suitable for applications where the specific parameter variations do not conflict with circuit requirements.

Critical parameters determining substitution eligibility:

Output voltage range: 2.495V minimum, 36V maximum
Output current capacity: 100 mA
Tolerance: ±1% or better
Package: TO-92-3 (TO-226-3)
Mounting: Through Hole

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output (Min/Max)	Current Output	Tolerance	Cathode Current	Operating Temp	RoHS Status
TL431AILPRP	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	1 mA	-40°C ~ 85°C	RoHS non-compliant
LM431BIZX	onsemi	Active	2.495V / 36V	100 mA	±1%	1 mA	-40°C ~ 85°C	ROHS3 Compliant
TL431AILPRPG	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	1 mA	-40°C ~ 85°C	ROHS3 Compliant
FAN431AZXA	Fairchild Semiconductor	Active	2.495V / 36V	100 mA	±1%	1 mA	-25°C ~ 85°C	Not specified
KA431AZTA	onsemi	Active	2.495V / 36V	100 mA	±1%	1 mA	-25°C ~ 85°C	ROHS3 Compliant
KA431LZTA	onsemi	Active	2.495V / 36V	100 mA	±0.5%	1 mA	-25°C ~ 85°C	ROHS3 Compliant
LM431BCZX	onsemi	Active	2.495V / 36V	100 mA	±1%	1 mA	-25°C ~ 85°C	ROHS3 Compliant
LM431BCZXA	onsemi	Active	2.495V / 36V	100 mA	±1%	1 mA	-25°C ~ 85°C	ROHS3 Compliant
TL431ACLPR	Texas Instruments	Active	2.495V / 36V	100 mA	±1%	600 µA	0°C ~ 70°C	ROHS3 Compliant
TL431AILPM	Texas Instruments	Active	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 85°C	ROHS3 Compliant
TL431AILPME3	Texas Instruments	Obsolete	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 85°C	ROHS3 Compliant

Engineering Selection Recommendations

For Active Product Status with RoHS3 Compliance: LM431BIZX, TL431AILPRPG, KA431AZTA, KA431LZTA, LM431BCZX, LM431BCZXA, TL431ACLPR, and TL431AILPM are all active products with ROHS3 compliance. LM431BIZX and TL431AILPM are preferred for applications requiring the full -40°C to 85°C operating temperature range matching the original TL431AILPRP specification.

For Extended Temperature Range (-40°C to 85°C): LM431BIZX, TL431AILPRPG, TL431AILPM, and TL431AILPME3 support the full temperature range of the original part. Parts with -25°C to 85°C range (FAN431AZXA, KA431AZTA, KA431LZTA, LM431BCZX, LM431BCZXA) are suitable for applications not requiring sub-zero operation.

For Improved Tolerance Specification: KA431LZTA offers ±0.5% tolerance, providing tighter voltage regulation compared to the ±1% specification of the original part. This part is suitable for applications requiring enhanced accuracy.

For Cathode Current Considerations: TL431ACLPR operates with 600 µA cathode current, lower than the 1 mA specification of the original part. TL431AILPM operates with 700 µA cathode current. These variations may affect circuit biasing and should be evaluated against specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can LM431BIZX directly replace TL431AILPRP in existing designs? A: Yes. LM431BIZX maintains identical electrical specifications (2.495V to 36V output, ±1% tolerance, 100 mA output, 1 mA cathode current) and operates across the same temperature range (-40°C to 85°C). The TO-92-3 package is mechanically compatible. LM431BIZX is an active product with ROHS3 compliance, making it suitable for production use.

Q: What is the difference between direct and similar substitutes? A: Direct substitutes maintain all electrical and thermal specifications of the original part. Similar substitutes share core electrical characteristics but may have different operating temperature ranges or cathode current specifications. Both categories maintain the critical parameters: 2.495V to 36V output range, ±1% tolerance, 100 mA output current, and TO-92-3 package.

Q: Are there any package compatibility concerns? A: All listed substitute parts use the TO-92-3 (TO-226-3) package with formed leads, ensuring mechanical and pin compatibility with the original TL431AILPRP. No PCB layout modifications are required.

Q: Why do some substitutes have different cathode current specifications? A: Cathode current variations (600 µA to 1 mA) reflect different device designs across manufacturers. The cathode current affects the minimum operating current and circuit biasing. For applications sensitive to this parameter, verify that the substitute's cathode current specification is compatible with the reference network design.

Q: Is RoHS compliance important for selecting a substitute? A: RoHS3 compliance is required for products destined for European markets and many regulated applications. Most active substitutes (LM431BIZX, KA431AZTA, KA431LZTA, LM431BCZX, LM431BCZXA, TL431ACLPR, TL431AILPM) are ROHS3 compliant. The original TL431AILPRP is RoHS non-compliant due to its obsolete status.

Q: Can KA431LZTA be used where ±1% tolerance is specified? A: Yes. KA431LZTA provides ±0.5% tolerance, which is tighter than the ±1% requirement. Parts with better tolerance specifications are functionally compatible with designs requiring ±1% accuracy.

Q: What is the inventory status of recommended substitutes? A: LM431BIZX (10,400 pcs), TL431AILPRPG (12,900 pcs), KA431AZTA (189,715 pcs), KA431LZTA (25,300 pcs), LM431BCZX (1,496 pcs), LM431BCZXA (5,475 pcs), TL431ACLPR (125,200 pcs), and TL431AILPM (30,177 pcs) are available in stock. KA431AZTA offers the highest inventory availability.

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