TL431BCLPE3 Equivalent & Substitute Parts

Part Overview

The TL431BCLPE3 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation and reference applications. This adjustable reference 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 part is currently listed as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL431BCLPE3
Reference Type	Shunt
Output Type	Adjustable
Voltage Output (Min)	2.495V
Voltage Output (Max)	36V
Output Current	100 mA
Tolerance	±0.5%
Cathode Current	600 µA
Operating Temperature	0°C to 70°C
Package	TO-92-3
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TL431BCLPE3 is determined by the following critical parameters:

Reference type must be shunt
Output type must be adjustable
Voltage output range must encompass or match 2.495V minimum and 36V maximum
Output current must be 100 mA
Package must be TO-92-3 (through-hole)
Tolerance must be ±0.5% or tighter
Operating temperature range should support 0°C to 70°C minimum

Substitutes are grouped into two categories: direct equivalents with matching specifications and functional alternatives with comparable or superior electrical characteristics that maintain circuit compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage Min	Voltage Max	Output Current	Tolerance	Cathode Current	Operating Temp	Package	Status
TL431BCLPE3	Texas Instruments	2.495V	36V	100 mA	±0.5%	600 µA	0°C to 70°C	TO-92-3	Obsolete
LM431CCZ/NOPB	National Semiconductor	2.5V	37V	100 mA	-0.6%, +0.4%	1 mA	0°C to 70°C	TO-92-3	Active
TL431BCLP	onsemi	2.495V	36V	100 mA	±0.4%	1 mA	0°C to 70°C	TO-92-3	Obsolete
KA431AZBU	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C to 85°C	TO-92-3	Active
TL1431ACZ	STMicroelectronics	2.5V	36V	100 mA	±0.25%	600 µA	-20°C to 70°C	TO-92-3	Active
TL1431IZ	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C to 105°C	TO-92-3	Active
TL431ACLPG	onsemi	2.495V	36V	100 mA	±1%	1 mA	0°C to 70°C	TO-92-3	Active
TL431ACZ	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	600 µA	0°C to 70°C	TO-92-3	Obsolete
TL431AILPG	onsemi	2.495V	36V	100 mA	±1%	1 mA	-40°C to 85°C	TO-92-3	Active
TL431AIZ	STMicroelectronics	2.495V	36V	100 mA	±1%	700 µA	-40°C to 105°C	TO-92-3	Active
TL431BCLPG	onsemi	2.495V	36V	100 mA	±0.4%	1 mA	0°C to 70°C	TO-92-3	Obsolete

Engineering Selection Recommendations

Primary Substitutes (Closest Match)

TL1431ACZ (STMicroelectronics) provides the tightest tolerance specification at ±0.25%, exceeding the original ±0.5% requirement. This part maintains identical voltage range, output current, and package specifications while offering active product status and RoHS3 compliance. The cathode current matches the original at 600 µA.

TL431BCLP (onsemi) delivers ±0.4% tolerance with matching voltage and current specifications. This part is functionally equivalent with improved tolerance performance, though listed as obsolete.

Secondary Substitutes (Functional Equivalents)

LM431CCZ/NOPB (National Semiconductor) operates within the required voltage range with slightly extended maximum output (37V vs 36V) and maintains 100 mA output current. Tolerance specification of -0.6%, +0.4% is asymmetrical but encompasses the ±0.5% requirement. Active product status ensures availability.

TL1431IZ (STMicroelectronics) offers ±0.4% tolerance with extended operating temperature range (-40°C to 105°C) and active status. Voltage and current specifications match requirements.

Alternative Substitutes (Wider Tolerance)

KA431AZBU (Fairchild Semiconductor), TL431ACLPG (onsemi), TL431ACZ (Fairchild Semiconductor), TL431AILPG (onsemi), and TL431AIZ (STMicroelectronics) all provide ±1% tolerance. These parts maintain voltage range and output current specifications but with relaxed tolerance. Selection depends on circuit tolerance requirements and extended temperature range needs.

All recommended substitutes maintain TO-92-3 through-hole packaging, shunt reference topology, and 100 mA output current capability. RoHS3 compliance is available across multiple active alternatives.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute with ±1% tolerance instead of ±0.5%?

A: Yes, if your circuit design accommodates the wider tolerance band. The ±1% tolerance parts (KA431AZBU, TL431ACLPG, TL431ACZ, TL431AILPG, TL431AIZ) maintain identical voltage range and output current. Verify that your feedback network and load regulation requirements accept the increased tolerance window.

Q: What is the difference between TL431 and TL1431 series?

A: Both are adjustable shunt voltage references with identical functional specifications. The TL1431 variants (TL1431ACZ, TL1431IZ) are manufactured by STMicroelectronics and offer comparable electrical characteristics. Selection between series depends on manufacturer preference and availability.

Q: Are all substitutes pin-compatible?

A: Yes. All listed substitutes use the TO-92-3 package with identical pinout: cathode, reference, and adjustment terminals. Direct board-level replacement is possible without layout modification.

Q: Which substitute offers the best long-term availability?

A: TL431AIZ (STMicroelectronics) shows the highest inventory level (389,850 pcs) and active product status, indicating strong long-term availability. TL1431IZ and LM431CCZ/NOPB also maintain active status with substantial stock levels.

Q: Can I use a substitute with a lower cathode current specification?

A: The original TL431BCLPE3 specifies 600 µA cathode current. Substitutes with 1 mA cathode current (LM431CCZ/NOPB, TL431BCLP, KA431AZBU, TL1431IZ, TL431ACLPG, TL431AILPG, TL431AIZ) draw higher quiescent current but remain functionally compatible. Verify that your power supply design accommodates the increased current draw.

Q: What is the significance of RoHS3 compliance?

A: RoHS3 compliance indicates the part meets current environmental and hazardous substance restrictions. TL1431ACZ, TL1431IZ, TL431ACLPG, TL431AILPG, and TL431AIZ carry RoHS3 certification, making them suitable for applications requiring regulatory compliance.

Q: Does operating temperature range affect substitution?

A: The original part operates 0°C to 70°C. Substitutes with extended ranges (-40°C to 105°C for TL1431IZ and TL431AIZ, -40°C to 85°C for TL431AILPG) provide additional margin for harsh environments but are fully compatible within the original temperature window.

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