TL1431CLPME3 Equivalent & Substitute Parts

Part Overview

The TL1431CLPME3 is a precision adjustable shunt voltage reference IC manufactured by Texas Instruments. This through-hole component operates across a 2.5V to 36V output range with ±0.4% tolerance and supports 100 mA output current. The device is classified as Active product status with 856 units currently in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers offer improved specifications, or when design requirements demand extended operating temperature ranges or enhanced performance characteristics. The TL1431CLPME3 belongs to the TL431/TL1431 family of adjustable shunt voltage references, which includes multiple equivalent options from different manufacturers.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL1431CLPME3
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.4%
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Active

Substitute Part Grouping Explanation

Substitution compatibility for the TL1431CLPME3 is determined by the following critical parameters:

Primary Compatibility Criteria:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Min/Fixed): 2.5V or 2.495V
Voltage - Output (Max): 36V
Current - Output: 100 mA
Tolerance: ±0.4% or ±0.5%
Current - Cathode: 1 mA
Mounting Type: Through Hole
Package / Case: TO-92-3 or TO-226-3 compatible

Substitution Categories:

Direct Substitutes (Active Status): Parts with identical or equivalent electrical specifications and active product status. These include TL1431CZ-AP, TL1431IZ-AP, TL1431IZT, and TL431BILPRAG. These parts maintain the same output voltage range, tolerance, and current ratings.

Functional Equivalents (Obsolete Status): Parts with matching electrical specifications but obsolete product status. TL1431CZT and TL431BVLPRAG fall into this category. While electrically compatible, these parts may have limited availability.

Alternative Manufacturers (Active Status): Parts from different manufacturers with comparable specifications. TL431BCLPRAG and TL431BCLPRMG from onsemi provide equivalent functionality with minor output voltage variations (2.495V vs 2.5V).

Similar Performance (Active Status): Parts with slightly relaxed tolerance specifications but superior temperature coefficients and extended operating ranges. AS431AZTR-E1 and AS431AZTR-G1 from Diodes Incorporated offer ±0.5% tolerance with 20ppm/°C temperature coefficient and -40°C to 125°C operating range.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp	Product Status	Inventory
TL1431CLPME3	Texas Instruments	2.5V	36V	100 mA	±0.4%	—	0°C ~ 70°C	Active	856 Pcs
TL1431CZ-AP	STMicroelectronics	2.5V	36V	100 mA	±0.4%	90ppm/°C	-20°C ~ 70°C	Active	4216 Pcs
TL1431CZT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	90ppm/°C	-20°C ~ 70°C	Active	6400 Pcs
TL1431IZ-AP	STMicroelectronics	2.5V	36V	100 mA	±0.4%	100ppm/°C	-40°C ~ 105°C	Active	4503 Pcs
TL1431IZT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	100ppm/°C	-40°C ~ 105°C	Active	3150 Pcs
TL431BILPRAG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	Active	12700 Pcs
TL431BCLPRAG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	Active	13000 Pcs
TL431BCLPRMG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	Obsolete	22801 Pcs
TL431BVLPRAG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 125°C	Obsolete	9390 Pcs
AS431AZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	20ppm/°C	-40°C ~ 125°C	Active	117200 Pcs
AS431AZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	20ppm/°C	-40°C ~ 125°C	Active	150200 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

TL1431CZ-AP and TL1431CZT from STMicroelectronics provide direct electrical equivalence to the TL1431CLPME3 with identical 2.5V output, ±0.4% tolerance, and 100 mA current rating. Both are Active status products with ROHS3 compliance and REACH unaffected certification. TL1431CZ-AP offers 4216 units in stock, while TL1431CZT provides 6400 units. The extended operating temperature range (-20°C to 70°C) of these parts accommodates the original specification.

For Extended Temperature Range Applications:

TL1431IZ-AP and TL1431IZT from STMicroelectronics extend the operating temperature range to -40°C to 105°C while maintaining ±0.4% tolerance and 100 mA output. These parts are Active status with ROHS3 compliance. TL1431IZ-AP provides 4503 units and TL1431IZT provides 3150 units in inventory. Temperature coefficient increases to 100ppm/°C compared to the original specification.

For High-Volume Availability:

TL431BCLPRAG from onsemi offers 13000 units in stock with Active product status and ROHS3 compliance. Output voltage is 2.495V with ±0.4% tolerance and 50ppm/°C temperature coefficient. Operating temperature range matches the original specification (0°C to 70°C). This part provides superior temperature stability compared to the original.

For Extended Temperature and Availability:

TL431BILPRAG from onsemi provides 12700 units with Active status, ROHS3 compliance, and extended operating range (-40°C to 85°C). Output voltage is 2.495V with ±0.4% tolerance and 50ppm/°C temperature coefficient.

For Maximum Availability and Extended Range:

AS431AZTR-G1 from Diodes Incorporated offers 150200 units in stock with Active status, ROHS3 compliance, and extended operating range (-40°C to 125°C). Tolerance is ±0.5% with superior 20ppm/°C temperature coefficient. This part accommodates the widest temperature range and provides the highest inventory availability.

Obsolete Parts to Avoid:

TL431BCLPRMG and TL431BVLPRAG are marked as Obsolete status. While inventory exists, these parts should not be selected for new designs or long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can TL431BCLPRAG replace TL1431CLPME3 directly?

A: Yes. TL431BCLPRAG from onsemi provides electrical equivalence with 2.495V output, ±0.4% tolerance, and 100 mA current rating. The 0.005V difference in minimum output voltage (2.495V vs 2.5V) falls within the tolerance specification. Operating temperature range (0°C to 70°C) matches the original. Both are Active status products with ROHS3 compliance.

Q: What is the difference between TL1431IZ-AP and TL1431CZ-AP?

A: Both parts are from STMicroelectronics with identical 2.5V output, ±0.4% tolerance, and 100 mA current rating. The primary difference is operating temperature range: TL1431CZ-AP operates 0°C to 70°C, while TL1431IZ-AP extends to -40°C to 105°C. TL1431IZ-AP has a higher temperature coefficient (100ppm/°C vs 90ppm/°C). Select TL1431IZ-AP for applications requiring extended temperature operation.

Q: Why do some substitutes have ±0.5% tolerance instead of ±0.4%?

A: AS431AZTR-E1 and AS431AZTR-G1 from Diodes Incorporated specify ±0.5% tolerance compared to the original ±0.4%. This represents a relaxed tolerance specification. However, these parts compensate with superior temperature coefficient (20ppm/°C) and extended operating range (-40°C to 125°C). Select these parts only when the ±0.5% tolerance is acceptable for the application.

Q: Are all substitute parts through-hole mounted?

A: Yes. All listed substitute parts use through-hole mounting with TO-92-3 or TO-226-3 package compatibility. Package compatibility is maintained across all substitutes.

Q: What is the significance of the 2.495V vs 2.5V output voltage difference?

A: The 0.005V difference between onsemi parts (2.495V) and Texas Instruments/STMicroelectronics/Diodes parts (2.5V) is within the ±0.4% tolerance specification. For the TL1431CLPME3 with 2.5V nominal output, the tolerance band is 2.5V ± 0.01V (2.49V to 2.51V). The 2.495V specification from onsemi falls within this acceptable range.

Q: Which substitute offers the best temperature stability?

A: AS431AZTR-G1 from Diodes Incorporated provides the lowest temperature coefficient at 20ppm/°C typical, compared to 50ppm/°C to 100ppm/°C for other substitutes. This part also offers the widest operating temperature range (-40°C to 125°C) and highest inventory availability (150200 units).

Q: Can I use an obsolete part like TL431BVLPRAG?

A: Obsolete parts should not be selected for new designs or production applications requiring long-term component availability. While TL431BVLPRAG offers 9390 units in stock and extended temperature range (-40°C to 125°C), its obsolete status indicates discontinued manufacturing. Use Active status alternatives instead.

Q: What is the minimum cathode current requirement?

A: All substitute parts require 1 mA minimum cathode current, identical to the TL1431CLPME3. This specification must be maintained in circuit design regardless of which substitute is selected.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance requirements of the original TL1431CLPME3.

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