TL1431QLPR Equivalent & Substitute Parts

Part Overview

The TL1431QLPR is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This device provides a fixed 2.5V minimum output with adjustable capability up to 36V, delivering 100 mA output current with ±0.4% tolerance. The part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. Shunt voltage reference ICs are critical components in precision power management circuits, voltage regulation feedback networks, and precision current sources.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL1431QLPR
Manufacturer	Texas Instruments
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	-40°C ~ 125°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TL1431QLPR is determined by the following critical parameters:

Primary Substitution Criteria:

Reference Type: Shunt (all substitutes must be shunt-type voltage references)
Output Type: Adjustable (maintains voltage adjustment capability)
Voltage Range: Minimum 2.5V output, maximum 36V output
Current Rating: 100 mA output current capability
Package: TO-92-3 or TO-226-3 (through-hole, pin-compatible)
Operating Temperature: -40°C to 125°C minimum range
Compliance: ROHS3 compliant, REACH unaffected

Secondary Compatibility Parameters:

Tolerance: ±0.4% (primary part specification; substitutes with ±0.5%, ±0.8%, or ±1% tolerance are functionally compatible for most applications)
Cathode Current: 1 mA nominal (substitutes with 50 µA are compatible)
Temperature Coefficient: Provided for reference; not a limiting factor for substitution

Substitute parts are grouped by tolerance grade and manufacturer to facilitate selection based on application precision requirements.

Parameter Comparison

Parameter	TL1431QLPR	AS431AZTR-E1	AS431AZTR-G1	AS431BZTR-E1	AS431BZTR-G1	AS431IAZTR-G1	AZ431AZ-ATRE1	AZ431AZ-ATRG1	AZ431BZ-ATRE1	FAN431AZXA	KA431AZTA
Manufacturer	Texas Instruments	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Fairchild Semi.	onsemi
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.495V	2.495V
Voltage - Output (Max)	36V	36V	36V	36V	36V	36V	36V	36V	36V	36V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±0.4%	±0.5%	±0.5%	±1%	±1%	±0.5%	±0.4%	±0.4%	±0.8%	±1%	±1%
Current - Cathode	1 mA	1 mA	1 mA	1 mA	1 mA	50 µA	1 mA	1 mA	1 mA	1 mA	1 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-25°C ~ 85°C	-25°C ~ 85°C
Package / Case	TO-92-3	TO-92	TO-92	TO-92	TO-92	TO-92	TO-92	TO-92	TO-92	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Specified	Not Applicable

Engineering Selection Recommendations

Highest Compatibility Tier (Matched Tolerance): AZ431AZ-ATRE1 and AZ431AZ-ATRG1 (Diodes Incorporated) provide ±0.4% tolerance matching the TL1431QLPR specification. Both parts are active products with full ROHS3 compliance and unlimited MSL rating. AZ431AZ-ATRE1 offers 1,300,100 units in stock inventory.

High Compatibility Tier (±0.5% Tolerance): AS431AZTR-E1, AS431AZTR-G1, and AS431IAZTR-G1 (Diodes Incorporated) deliver ±0.5% tolerance with active product status and ROHS3 compliance. AS431IAZTR-G1 features reduced cathode current (50 µA) for low-power applications. Inventory availability ranges from 56,350 to 150,200 units.

Standard Compatibility Tier (±0.8% to ±1% Tolerance): AS431BZTR-E1, AS431BZTR-G1, and AZ431BZ-ATRE1 (Diodes Incorporated) provide ±0.8% to ±1% tolerance with active status and ROHS3 compliance. These parts support applications with relaxed tolerance requirements. AZ431BZ-ATRE1 offers 875,400 units in stock.

Extended Temperature Range Consideration: FAN431AZXA (Fairchild Semiconductor) and KA431AZTA (onsemi) operate within -25°C to 85°C temperature range, which is narrower than the TL1431QLPR specification (-40°C to 125°C). These parts are suitable only for applications within their specified temperature limits.

All substitute parts maintain pin-compatible TO-92 or TO-92-3 packaging, adjustable output type, and 100 mA current rating. Selection should prioritize active product status and ROHS3 compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can AS431BZTR-E1 replace TL1431QLPR directly? A: Yes. AS431BZTR-E1 is pin-compatible in TO-92 package, maintains 2.5V to 36V adjustable output range, and delivers 100 mA current. The ±1% tolerance is less stringent than the original ±0.4%, making it suitable for applications where tighter tolerance is not required. Both parts operate across -40°C to 125°C.

Q: What is the difference between AZ431AZ-ATRE1 and AZ431AZ-ATRG1? A: Both parts are identical in electrical specifications, including ±0.4% tolerance, 2.5V to 36V output range, and 100 mA current rating. The difference lies in packaging designation and inventory availability. AZ431AZ-ATRE1 has significantly higher stock (1,300,100 units) compared to AZ431AZ-ATRG1 (1,410 units).

Q: Why do FAN431AZXA and KA431AZTA have different operating temperature ranges? A: FAN431AZXA and KA431AZTA are specified for -25°C to 85°C operation, which is narrower than the TL1431QLPR range of -40°C to 125°C. These parts are not suitable for applications requiring full -40°C to 125°C temperature coverage. Use only in designs operating within their specified temperature limits.

Q: Is AS431IAZTR-G1 suitable for low-power applications? A: AS431IAZTR-G1 features 50 µA cathode current compared to 1 mA in other substitutes. This reduced current consumption makes it suitable for battery-powered or low-power circuit designs. Electrical performance remains equivalent across all other parameters.

Q: Are all substitute parts ROHS3 compliant? A: All Diodes Incorporated and onsemi parts listed are ROHS3 compliant. FAN431AZXA (Fairchild Semiconductor) does not specify RoHS status in the provided data. For applications requiring ROHS3 certification, select from Diodes Incorporated or onsemi alternatives.

Q: What tolerance should I select for precision voltage reference applications? A: For precision applications, select AZ431AZ-ATRE1 or AZ431AZ-ATRG1 (±0.4% tolerance, matching the original TL1431QLPR). For general-purpose applications, AS431AZTR-E1 or AS431AZTR-G1 (±0.5% tolerance) provide adequate precision with higher inventory availability.

Q: Are TO-92 and TO-92-3 packages pin-compatible? A: TO-92 and TO-92-3 refer to the same three-lead through-hole package format with identical pin configuration. All listed substitutes are mechanically and electrically compatible in TO-92 or TO-92-3 package designations.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message