TL1431CLPE3 Equivalent & Substitute Parts

Part Overview

The TL1431CLPE3 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component provides a fixed 2.5V to 36V adjustable output with ±0.4% 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. Active alternatives from multiple manufacturers offer comparable electrical specifications with enhanced availability and extended product lifecycles.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage Output (Min/Fixed)	2.5V
Voltage Output (Max)	36V
Output Current	100 mA
Tolerance	±0.4%
Cathode Current	1 mA
Operating Temperature	0°C ~ 70°C
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL1431CLPE3 is determined by the following critical parameters:

Primary Substitution Criteria:

Reference Type: Shunt (all candidates match)
Output Type: Adjustable (all candidates match)
Voltage Output Range: 2.5V minimum to 36V maximum (all candidates match)
Output Current: 100 mA (all candidates match)
Cathode Current: 1 mA (all candidates match)
Package: TO-92-3 through-hole configuration (all candidates match)
RoHS Compliance: ROHS3 Compliant (all candidates match)

Secondary Compatibility Factors:

Tolerance: ±0.4% (primary specification); substitutes with ±0.5% to ±2% tolerance remain functionally compatible within application-dependent accuracy requirements
Operating Temperature: 0°C ~ 70°C (primary); substitutes with extended ranges (-40°C to 105°C) provide enhanced environmental capability
Temperature Coefficient: Provided where specified; variations indicate different thermal stability characteristics

All substitute parts listed maintain electrical and mechanical compatibility with the TL1431CLPE3 within the specified parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output (Min)	Voltage Output (Max)	Output Current	Tolerance	Cathode Current	Operating Temp	Package
TL1431CLPE3	Texas Instruments	Obsolete	2.5V	36V	100 mA	±0.4%	1 mA	0°C ~ 70°C	TO-92-3
TL1431CLP	Texas Instruments	Active	2.5V	36V	100 mA	±0.4%	1 mA	0°C ~ 70°C	TO-92-3
TL1431IZ	STMicroelectronics	Active	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 105°C	TO-92-3
KA431AZBU	Fairchild Semiconductor	Active	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	TO-92-3
LM431ACZ	onsemi	Active	2.5V	36V	100 mA	±2%	1 mA	-25°C ~ 85°C	TO-92-3
LM431AIZ	Fairchild Semiconductor	Active	2.5V	36V	100 mA	±2%	1 mA	-40°C ~ 85°C	TO-92-3
LM431CCZ	onsemi	Active	2.495V	36V	100 mA	±0.5%	1 mA	-25°C ~ 85°C	TO-92-3
LT1431CZ#PBF	Analog Devices Inc.	Active	2.5V	36V	100 mA	±0.4%	1 mA	0°C ~ 70°C	TO-92-3
LT1431IZ#PBF	Analog Devices Inc.	Active	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 85°C	TO-92-3
TL1431ACZ	STMicroelectronics	Active	2.5V	36V	100 mA	±0.25%	600 µA	-20°C ~ 70°C	TO-92-3
TL431ACLPG	onsemi	Active	2.495V	36V	100 mA	±1%	1 mA	0°C ~ 70°C	TO-92-3

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): TL1431CLP from Texas Instruments is the direct active equivalent, maintaining identical electrical and thermal specifications with the same ±0.4% tolerance and 0°C ~ 70°C operating range. This part provides seamless design continuity with no circuit modifications required.

Enhanced Availability Alternatives: LT1431CZ#PBF and LT1431IZ#PBF from Analog Devices Inc. match the ±0.4% tolerance specification. The LT1431IZ#PBF variant extends the operating temperature range to -40°C ~ 85°C, suitable for applications requiring broader environmental performance. Both parts maintain ROHS3 compliance and RoHS certification status.

Tolerance-Relaxed Substitutes: For applications where ±0.4% tolerance is not critical, LM431CCZ (±0.5% tolerance) from onsemi provides closer tolerance than broader alternatives while maintaining full electrical compatibility. KA431AZBU (±1% tolerance) and LM431ACZ (±2% tolerance) remain functionally compatible for less stringent accuracy requirements.

Extended Temperature Range Options: TL1431IZ from STMicroelectronics and LT1431IZ#PBF from Analog Devices Inc. both support -40°C ~ 85°C operating ranges, accommodating industrial and automotive applications requiring enhanced thermal performance beyond the original 0°C ~ 70°C specification.

All substitute parts are ROHS3 compliant and maintain through-hole TO-92-3 package compatibility, ensuring direct PCB footprint compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can TL1431CLP directly replace TL1431CLPE3 without circuit modifications? A: Yes. TL1431CLP is the active equivalent with identical electrical specifications: ±0.4% tolerance, 2.5V to 36V output range, 100 mA output current, and 0°C ~ 70°C operating temperature. No design changes are required.

Q: What is the difference between ±0.4% and ±0.5% tolerance substitutes? A: Tolerance specifies the maximum deviation of the output voltage from the nominal 2.5V reference. ±0.4% allows ±10 mV deviation; ±0.5% allows ±12.5 mV deviation. Selection depends on application accuracy requirements. Tighter tolerance parts (±0.4%, ±0.25%) are suitable for precision voltage regulation; relaxed tolerance parts (±1%, ±2%) are acceptable for general-purpose applications.

Q: Are all substitute parts compatible with the same PCB footprint? A: Yes. All listed substitutes use the TO-92-3 (TO-226AA) through-hole package, maintaining identical pin spacing and PCB hole pattern. Direct socket replacement is possible without layout modifications.

Q: Which substitute offers the widest operating temperature range? A: TL1431IZ from STMicroelectronics supports -40°C ~ 105°C, the broadest range among all substitutes. This variant is suitable for automotive, industrial, and extreme environment applications.

Q: What is the significance of cathode current specifications? A: Cathode current (1 mA typical, 600 µA for TL1431ACZ) represents the minimum current required to maintain regulation. Most substitutes specify 1 mA; TL1431ACZ requires only 600 µA, reducing power dissipation in low-current applications.

Q: Can I use a ±2% tolerance part in a precision voltage reference circuit? A: Application-dependent. If the circuit design accommodates ±2% output voltage variation, parts like LM431ACZ are acceptable. For precision applications requiring ±0.4% or better, select TL1431CLP, LT1431CZ#PBF, or TL1431ACZ.

Q: What does ROHS3 compliance mean for this component? A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitutes maintain ROHS3 compliance, ensuring regulatory compatibility for EU and global markets.

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