TL431AIP Equivalent & Substitute Parts

Part Overview

The TL431AIP is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component provides a stable 2.495V to 36V adjustable output with ±1% tolerance and 100 mA output current capability in an 8-PDIP through-hole package. The TL431AIP is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

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%
Current - Cathode	700 µA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL431AIP is determined by the following critical parameters:

Reference Type: Shunt voltage reference functionality
Output Type: Adjustable output voltage capability
Voltage Range: 2.495V minimum to 36V maximum output
Current Rating: 100 mA output current
Tolerance: ±1% or better accuracy
Operating Temperature Range: -40°C to 85°C minimum
Package Compatibility: 8-PDIP through-hole or equivalent pinout

Substitute parts must maintain electrical equivalence across these parameters. Package form factor may differ (through-hole to surface mount) provided pinout compatibility is maintained through adapter solutions or direct circuit redesign.

Parameter Comparison

Parameter	TL431AIP	TL431AIDBZR	LT1431CN8#PBF	LT1431IN8#PBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Linear Technology
Reference Type	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.495V	2.495V	2.5V	2.5V
Voltage - Output (Max)	36V	36V	36V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA
Tolerance	±1%	±1%	±0.4%	±0.4%
Current - Cathode	700 µA	700 µA	1 mA	1 mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole
Package / Case	8-DIP	SOT-23-3	8-DIP	8-DIP
Product Status	Obsolete	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

TL431AIDBZR is the manufacturer-recommended primary substitute from Texas Instruments. This part maintains identical electrical specifications (2.495V output, ±1% tolerance, 100 mA current, 700 µA cathode current) and full temperature range (-40°C to 85°C). The primary difference is packaging: TL431AIDBZR uses SOT-23-3 surface mount form factor versus the through-hole 8-DIP of the original. This part is active and ROHS3 compliant with unlimited moisture sensitivity rating.

LT1431CN8#PBF from Analog Devices Inc. provides through-hole 8-DIP packaging identical to the TL431AIP. This part offers superior tolerance (±0.4% versus ±1%) and maintains the 100 mA output current and 36V maximum voltage. Operating temperature range is limited to 0°C to 70°C, which may restrict use in extended temperature applications. This part is active and ROHS3 compliant.

LT1431IN8#PBF from Linear Technology maintains through-hole 8-DIP packaging and full temperature range (-40°C to 85°C) matching the original. However, this part is classified as obsolete and RoHS non-compliant, making it unsuitable for new designs or applications requiring regulatory compliance.

For new designs requiring through-hole mounting, LT1431CN8#PBF is preferred if operating temperature does not exceed 70°C. For applications requiring full -40°C to 85°C range with surface mount capability, TL431AIDBZR is the recommended choice.

Frequently Asked Questions (FAQ)

Q: Can TL431AIDBZR directly replace TL431AIP in existing PCB layouts?

A: No. TL431AIDBZR uses SOT-23-3 surface mount packaging while TL431AIP uses 8-DIP through-hole packaging. Direct PCB substitution is not possible without circuit board redesign or adapter solutions. Electrical functionality is equivalent.

Q: What is the key difference between LT1431CN8#PBF and LT1431IN8#PBF?

A: Both use identical 8-DIP through-hole packaging and provide ±0.4% tolerance. LT1431CN8#PBF is active and ROHS3 compliant with 0°C to 70°C operating range. LT1431IN8#PBF is obsolete, RoHS non-compliant, but supports -40°C to 85°C operation. LT1431CN8#PBF is preferred for new applications.

Q: Are all substitute parts pin-compatible with TL431AIP?

A: LT1431CN8#PBF and LT1431IN8#PBF maintain 8-DIP through-hole pinout compatibility with TL431AIP. TL431AIDBZR uses SOT-23-3 pinout, which is not directly compatible without redesign.

Q: Which substitute part has the best tolerance specification?

A: Both LT1431CN8#PBF and LT1431IN8#PBF offer ±0.4% tolerance, superior to the TL431AIP and TL431AIDBZR at ±1%. This provides tighter voltage regulation accuracy.

Q: Can I use TL431AIDBZR in applications requiring -40°C to 85°C operation?

A: Yes. TL431AIDBZR supports the full -40°C to 85°C operating temperature range, matching the original TL431AIP specification.

Q: What is the cathode current difference between substitute parts?

A: TL431AIP and TL431AIDBZR specify 700 µA cathode current. LT1431CN8#PBF and LT1431IN8#PBF specify 1 mA cathode current. This difference may affect circuit biasing and should be verified in application-specific designs.

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