TL431BCLPM Equivalent & Substitute Parts

Part Overview

The TL431BCLPM is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device operates across a 2.495V to 36V output range with ±0.5% tolerance and supports 100 mA output current in a TO-92-3 through-hole package. The product is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431BCLPM
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Current - Cathode	600 µA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL431BCLPM is determined by the following critical parameters:

Core Electrical Parameters:

Reference Type: Shunt (all substitutes must maintain shunt topology)
Output Type: Adjustable (voltage reference must be adjustable)
Voltage Range: Output minimum 2.495V to 2.5V, maximum 36V
Current - Output: 100 mA capability
Tolerance: ±0.5% or better (tighter tolerance acceptable)

Physical Parameters:

Package: TO-92-3 or TO-226-3 (through-hole, same footprint family)
Mounting Type: Through Hole

Compliance Parameters:

RoHS3 Compliant
REACH Unaffected
ECCN: EAR99

Substitute parts are grouped by manufacturer and tolerance grade. Parts with tighter tolerance specifications (±0.4%) or extended temperature ranges (-40°C to 125°C) represent functional upgrades while maintaining full backward compatibility. Parts with relaxed tolerance (±2.2%, ±1%, ±0.8%) are acceptable only where the application permits wider voltage reference variation.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Temp Range	Package	Status
TL431BCLPM	Texas Instruments	2.495V	36V	100 mA	±0.5%	600 µA	0°C ~ 70°C	TO-92-3	Obsolete
TL431CLPM	Texas Instruments	2.495V	36V	100 mA	±2.2%	1 mA	0°C ~ 70°C	TO-92-3	Active
KA431LZTA	onsemi	2.495V	36V	100 mA	±0.5%	1 mA	-25°C ~ 85°C	TO-92-3	Active
AS431AZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431AZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431BZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431BZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431IAZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	50 µA	-40°C ~ 125°C	TO-92-3	Active
AZ431AZ-ATRE1	Diodes Incorporated	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AZ431AZ-ATRG1	Diodes Incorporated	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AZ431BZ-ATRE1	Diodes Incorporated	2.5V	36V	100 mA	±0.8%	1 mA	-40°C ~ 125°C	TO-92-3	Active

Engineering Selection Recommendations

Direct Replacement (Matched Tolerance): KA431LZTA (onsemi) and AS431AZTR-E1 / AS431AZTR-G1 (Diodes Incorporated) provide ±0.5% tolerance matching the original TL431BCLPM specification. These parts are active products with full production support. The Diodes Incorporated variants offer extended operating temperature range (-40°C to 125°C) compared to the original 0°C to 70°C specification, providing enhanced reliability in wider environmental conditions.

Upgraded Performance: AZ431AZ-ATRE1 and AZ431AZ-ATRG1 (Diodes Incorporated) deliver superior ±0.4% tolerance with extended temperature range, representing a performance upgrade while maintaining full electrical and mechanical compatibility. AS431IAZTR-G1 (Diodes Incorporated) offers ±0.5% tolerance with reduced cathode current (50 µA versus 600 µA), beneficial for low-power applications.

Relaxed Tolerance Alternatives: TL431CLPM (Texas Instruments) and AS431BZTR-E1 / AS431BZTR-G1 (Diodes Incorporated) feature relaxed tolerance specifications (±2.2% and ±1% respectively). These are suitable only for applications where voltage reference accuracy is not critical to circuit performance.

All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, and EAR99 ECCN classification. All parts are available in active production status with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can I use TL431CLPM as a direct replacement for TL431BCLPM?

A: TL431CLPM is electrically compatible but features ±2.2% tolerance versus the original ±0.5%. Use only if your circuit design tolerates this wider voltage reference variation. Both parts share identical voltage range (2.495V to 36V), current rating (100 mA), and TO-92-3 package.

Q: What is the difference between AS431AZTR-E1 and AS431AZTR-G1?

A: Both parts are functionally identical with ±0.5% tolerance, 2.5V to 36V output range, and -40°C to 125°C operating temperature. The difference lies in manufacturing date code and tape reel configuration (E1 versus G1 suffix). Either part is suitable for replacement.

Q: Why do some substitutes have 2.5V minimum output instead of 2.495V?

A: The 2.5V specification is functionally equivalent for adjustable shunt references. The 5 mV difference is negligible in practical circuit applications and does not affect substitution eligibility. Both specifications fall within the adjustable reference category.

Q: Is AS431IAZTR-G1 compatible with my design?

A: AS431IAZTR-G1 is compatible if your circuit operates with ±0.5% tolerance and -40°C to 125°C temperature range. The primary distinction is reduced cathode current (50 µA versus 600 µA in the original), which reduces quiescent current draw. This is beneficial for low-power designs and does not create compatibility issues.

Q: Can I use parts with ±0.4% tolerance (AZ431AZ series) as replacements?

A: Yes. Tighter tolerance specifications are fully backward compatible. AZ431AZ-ATRE1 and AZ431AZ-ATRG1 provide superior voltage reference accuracy (±0.4%) with extended temperature range (-40°C to 125°C), making them suitable upgrades for any application originally designed for TL431BCLPM.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All listed substitutes use TO-92-3 or TO-226-3 (equivalent through-hole package family) with formed leads. Physical footprint compatibility is maintained across all alternatives.

Q: What compliance certifications apply to these substitutes?

A: All substitute parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes, matching the original TL431BCLPM certifications.

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