TL431ACDRE4 Equivalent & Substitute Parts

Part Overview

The TL431ACDRE4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable output voltage regulation in power management applications. This component operates with a fixed output voltage of 2.495V, maximum output voltage of 36V, and supports 100 mA output current with ±1% tolerance. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL431ACDRE4
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Current - Cathode	600 µA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TL431ACDRE4 is determined by the following critical parameters:

Primary Substitution Criteria:

Reference Type: Shunt
Output Type: Adjustable
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Output Voltage Range: Minimum 2.495V, Maximum ≥36V
Output Current: 100 mA
Tolerance: ±1% (preferred) or ±2% (acceptable with design verification)

Substitute Categories:

MFR Recommended Substitutes maintain electrical and mechanical compatibility with identical or superior specifications. These parts are active products with established supply chains.

Upgrade Substitutes offer enhanced operating temperature ranges or automotive-grade qualifications, suitable for applications requiring extended environmental performance.

Substitutes are grouped by tolerance specification and operating temperature range to ensure design compatibility without circuit modification.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min/Fixed)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Product Status	Package
TL431ACDRE4	Texas Instruments	2.495V	36V	100 mA	±1%	600 µA	0°C ~ 70°C	Obsolete	8-SOIC
TL431ACDR	Texas Instruments	2.495V	36V	100 mA	±1%	600 µA	0°C ~ 70°C	Active	8-SOIC
LM431ACM/NOPB	National Semiconductor	2.495V	37V	100 mA	±2.2%	1 mA	0°C ~ 70°C	Active	8-SOIC
LM431ACMX/NOPB	Texas Instruments	2.495V	37V	100 mA	±2.2%	1 mA	0°C ~ 70°C	Active	8-SOIC
LM431BCM/NOPB	Texas Instruments	2.495V	37V	100 mA	±1%	1 mA	0°C ~ 70°C	Active	8-SOIC
LM431BCMX/NOPB	National Semiconductor	2.495V	37V	100 mA	±1%	1 mA	0°C ~ 70°C	Active	8-SOIC
TL431AIDT	STMicroelectronics	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 105°C	Active	8-SOIC
TL431AIYDT	STMicroelectronics	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 125°C	Active	8-SOIC
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	1 mA	-25°C ~ 85°C	Active	8-SOIC
LM431AIMX	National Semiconductor	2.5V	36V	100 mA	±2%	1 mA	-40°C ~ 85°C	Active	8-SOIC
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	Active	8-SOIC

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): TL431ACDR is the primary direct replacement for TL431ACDRE4. Both parts share identical electrical specifications (2.495V output, 36V maximum, ±1% tolerance) and operating temperature range (0°C ~ 70°C). TL431ACDR is manufactured by Texas Instruments and maintains active product status with established supply availability.

Tolerance-Compatible Substitutes (±2% Tolerance): LM431ACM/NOPB, LM431ACMX/NOPB, KA431DTF, and LM431AIMX operate with ±2% tolerance instead of ±1%. These parts are suitable for applications where the relaxed tolerance specification does not impact circuit performance. All maintain 100 mA output current and 8-SOIC packaging.

Tolerance-Matched Substitutes (±1% Tolerance): LM431BCM/NOPB, LM431BCMX/NOPB, and LM431BCMX maintain ±1% tolerance matching the original part. These parts support extended operating temperature ranges (-25°C ~ 85°C) compared to the original 0°C ~ 70°C specification.

Extended Temperature Range Upgrades: TL431AIDT and TL431AIYDT are STMicroelectronics alternatives offering expanded operating temperature ranges (-40°C ~ 105°C and -40°C ~ 125°C respectively). TL431AIYDT includes automotive-grade qualification (AEC-Q100) for applications requiring enhanced reliability and environmental performance.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance. LM431AIMX is noted as RoHS non-compliant and REACH affected; use only if existing design constraints permit.

Frequently Asked Questions (FAQ)

Q: Can TL431ACDR directly replace TL431ACDRE4 without circuit modification? A: Yes. TL431ACDR is electrically and mechanically identical to TL431ACDRE4, with matching output voltage (2.495V), maximum voltage (36V), current rating (100 mA), tolerance (±1%), and operating temperature range (0°C ~ 70°C). Both use 8-SOIC packaging.

Q: What is the difference between ±1% and ±2% tolerance substitutes? A: Tolerance specifies the accuracy of the output voltage. ±1% tolerance provides tighter voltage regulation than ±2%. Select ±2% tolerance substitutes only if your circuit design accommodates the wider voltage variation without performance degradation.

Q: Are the STMicroelectronics TL431AIDT and TL431AIYDT suitable for standard industrial applications? A: TL431AIDT supports standard industrial temperature range (-40°C ~ 105°C). TL431AIYDT includes automotive-grade qualification (AEC-Q100) and extended temperature range (-40°C ~ 125°C), making it suitable for automotive and high-reliability applications. Both are compatible with the original 8-SOIC package.

Q: Why do some substitutes have different cathode current specifications? A: Cathode current (600 µA vs. 1 mA) represents the minimum operating current. Parts with 1 mA cathode current require slightly higher bias current but maintain functional compatibility. This difference does not affect circuit operation in standard applications.

Q: Can I use KA431DTF or LM431AIMX as substitutes despite their ±2% tolerance? A: Yes, if your circuit design tolerates ±2% output voltage variation. Both parts maintain 100 mA output current and 8-SOIC packaging. KA431DTF operates at -25°C ~ 85°C; LM431AIMX operates at -40°C ~ 85°C. Verify your application's voltage regulation requirements before selection.

Q: Is the 8-SOIC package identical across all substitute parts? A: Yes. All substitute parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical compatibility with existing PCB layouts and reflow soldering processes.

Q: Which substitute offers the best supply availability? A: LM431ACMX/NOPB (40,100 pcs), LM431BCMX (26,067 pcs), and TL431AIDT (65,200 pcs) show the highest inventory levels, indicating strong supply chain availability for procurement planning.

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