Equivalent & Substitute Parts for TL431ILP

Part Overview

The TL431ILP is a shunt voltage reference IC manufactured by Microchip Technology, classified as a Power Management (PMIC) component. This device provides an adjustable output voltage reference with ±2% tolerance, suitable for applications requiring precision voltage regulation and feedback control. The TL431ILP is currently listed as obsolete, making identification of functionally equivalent and active alternatives necessary for new designs and production continuity.

Key Parameters

Parameter	TL431ILP
Manufacturer	Microchip Technology
Package Type	TO-92-3 (TO-226AC)
Reference Type	Shunt
Output Type	Adjustable
Output Voltage (Min/Fixed)	2.5V
Output Voltage (Max)	36V
Output Current	100 mA
Tolerance	±2%
Temperature Coefficient	30ppm/°C Typical
Cathode Current	1 mA
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Through Hole
Product Status	Obsolete
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the TL431ILP are grouped based on critical electrical and mechanical parameters that ensure functional compatibility:

Primary Compatibility Criteria:

Reference Type: Shunt (all substitutes maintain this type)
Output Type: Adjustable (all substitutes provide adjustable output)
Package: TO-92-3 form factor with through-hole mounting
Output Voltage Range: 2.5V minimum to 36V maximum
Output Current Capacity: 100 mA
Cathode Current: 1 mA (standard for this component class)
REACH Compliance: REACH Unaffected status

Tolerance and Temperature Considerations: Substitute parts are further categorized by tolerance specifications (ranging from ±0.4% to ±2.21%) and operating temperature ranges (-40°C to 125°C in active alternatives). These variations allow selection based on application-specific accuracy requirements while maintaining electrical compatibility with the original design.

Parameter Comparison

Part Number	Manufacturer	Status	Output Voltage (Min)	Output Voltage (Max)	Tolerance	Temp Coefficient	Operating Temp Range	Package	Cathode Current
TL431ILP	Microchip Technology	Obsolete	2.5V	36V	±2%	30ppm/°C	-40°C ~ 85°C	TO-92-3	1 mA
TL431IZ	STMicroelectronics	Active	2.495V	36V	±2.21%	—	-40°C ~ 105°C	TO-92-3	1 mA
AS431AZTR-E1	Diodes Incorporated	Active	2.5V	36V	±0.5%	20ppm/°C	-40°C ~ 125°C	TO-92	1 mA
AS431AZTR-G1	Diodes Incorporated	Active	2.5V	36V	±0.5%	20ppm/°C	-40°C ~ 125°C	TO-92	1 mA
AS431BZTR-E1	Diodes Incorporated	Active	2.5V	36V	±1%	20ppm/°C	-40°C ~ 125°C	TO-92	1 mA
AS431BZTR-G1	Diodes Incorporated	Active	2.5V	36V	±1%	20ppm/°C	-40°C ~ 125°C	TO-92	1 mA
AS431IAZTR-G1	Diodes Incorporated	Active	2.5V	36V	±0.5%	—	-40°C ~ 125°C	TO-92	50 µA
AZ431AZ-ATRG1	Diodes Incorporated	Active	2.5V	36V	±0.4%	20ppm/°C	-40°C ~ 125°C	TO-92	1 mA
KA431AZBU	Fairchild Semiconductor	Active	2.495V	36V	±1%	50ppm/°C	-25°C ~ 85°C	TO-92-3	1 mA
LM431AIZ	Fairchild Semiconductor	Active	2.5V	36V	±2%	50ppm/°C	-40°C ~ 85°C	TO-92-3	1 mA
LT1431CZ#PBF	Analog Devices Inc.	Active	2.5V	36V	±0.4%	30ppm/°C	0°C ~ 70°C	TO-92-3	1 mA

Engineering Selection Recommendations

For Direct Replacement (Same Package TO-92-3):

LM431AIZ (Fairchild Semiconductor): Active product with matching ±2% tolerance and identical operating temperature range (-40°C ~ 85°C). TO-92-3 package ensures pin-for-pin compatibility and mechanical fit.
KA431AZBU (Fairchild Semiconductor): Active product with ±1% tolerance and TO-92-3 package. Note operating temperature range is -25°C ~ 85°C, which is narrower than the original.
TL431IZ (STMicroelectronics): Active product with extended operating temperature range to 105°C. Tolerance specification of ±2.21% is slightly broader than the original ±2%.

For Enhanced Performance (Tighter Tolerance, Extended Range):

AS431AZTR-E1, AS431AZTR-G1, AZ431AZ-ATRG1 (Diodes Incorporated): All offer ±0.4% to ±0.5% tolerance with operating range to 125°C. Package is TO-92 (three-lead formulation compatible with TO-92-3 pinouts). RoHS3 compliance adds modern manufacturing certification.
AS431IAZTR-G1 (Diodes Incorporated): Provides ±0.5% tolerance with lower cathode current (50 µA vs. 1 mA), suitable for ultra-low-quiescent-current applications.
LT1431CZ#PBF (Analog Devices Inc.): Offers ±0.4% tolerance with 30ppm/°C temperature coefficient matching the original. Operating range is 0°C ~ 70°C, requiring verification for full industrial temperature applications.

Compliance and Availability: All active substitutes listed maintain REACH Unaffected status. Multiple parts from Diodes Incorporated (AS431 and AZ431 series) provide the highest current inventory levels, supporting extended production requirements.

Frequently Asked Questions (FAQ)

Q: Can AS431 series parts directly replace TL431ILP? A: AS431 parts are electrically equivalent but package as TO-92 (three discrete leads) rather than TO-92-3. Pin configurations and electrical specifications are compatible. Mechanical mounting may differ; verify PCB footprint compatibility before design integration.

Q: What is the primary difference between ±2% and ±0.5% tolerance specifications? A: Tolerance defines the allowable variation in output voltage accuracy at nominal operating conditions. ±0.5% provides tighter regulation suitable for precision feedback applications, while ±2% accommodates applications with broader voltage acceptance bands. Both are functionally equivalent for standard voltage reference circuits.

Q: Why do some substitutes specify lower cathode current (50 µA vs. 1 mA)? A: Cathode current represents the minimum operating current required for stable voltage regulation. Lower cathode current indicates reduced quiescent power consumption, beneficial in battery-powered or energy-constrained designs. Both values remain within the shunt reference operating principle and are compatible with standard biasing networks.

Q: Are RoHS3-compliant parts suitable for legacy circuit designs? A: Yes. RoHS3 compliance indicates conformance to modern environmental standards without affecting electrical performance or pin compatibility. RoHS3 certified parts function identically to non-certified equivalents in existing designs.

Q: What operating temperature range should be selected for new designs? A: Select based on application environment. Extended range parts (-40°C ~ 125°C) from Diodes Incorporated support broader industrial and automotive applications. Narrower range parts (-25°C ~ 85°C or 0°C ~ 70°C) are suitable for consumer and commercial temperature environments where those boundaries are adequate.

Q: Can TL431ILP be cross-referenced to other voltage reference families? A: The TL431, AS431, AZ431, KA431, LM431, and LT1431 families all operate as adjustable shunt voltage references with identical functional parameters (2.5V–36V adjustable output, 100 mA current capacity). These families are interchangeable at the circuit level when tolerance, temperature range, and package form factors are matched to design specifications.

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