TL431CDRE4 Equivalent & Substitute Parts

Part Overview

The TL431CDRE4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable precision voltage regulation applications. This component provides a fixed output voltage of 2.495V with a maximum output of 36V and supports output currents up to 100 mA. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility across electrical specifications, mechanical packaging, and thermal operating ranges to ensure direct replacement capability.

Key Parameters

Parameter	TL431CDRE4 Specification
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±2.2%
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TL431CDRE4 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Reference Type: Shunt (all substitutes must be shunt-type references)
Output Type: Adjustable (maintains voltage regulation capability)
Voltage - Output (Min/Fixed): 2.495V or compatible fixed voltage
Voltage - Output (Max): 36V or higher
Current - Output: 100 mA (minimum requirement)
Package / Case: 8-SOIC form factor (ensures PCB compatibility)
Mounting Type: Surface Mount (maintains assembly compatibility)

Acceptable Variation Parameters:

Tolerance: ±2.2% or better (lower tolerance values are acceptable upgrades)
Operating Temperature: May extend beyond 0°C ~ 70°C range
Current - Cathode: 1 mA baseline; variations acceptable if within device specifications
Product Status: Active status preferred for long-term availability

Substitute parts are grouped by tolerance grade and manufacturer, with preference given to active products offering improved accuracy or extended temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Operating Temp	Package	Status
TL431CDRE4	Texas Instruments	2.495V	36V	100 mA	±2.2%	0°C ~ 70°C	8-SOIC	Obsolete
LM431BCM/NOPB	Texas Instruments	2.495V	37V	100 mA	±1%	0°C ~ 70°C	8-SOIC	Active
LM431BCMX/NOPB	National Semiconductor	2.495V	37V	100 mA	±1%	0°C ~ 70°C	8-SOIC	Active
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	-25°C ~ 85°C	8-SOIC	Active
TL431IDT	STMicroelectronics	2.495V	36V	100 mA	±2.21%	-40°C ~ 105°C	8-SOIC	Active
TL431IYDT	STMicroelectronics	2.495V	36V	100 mA	±2.21%	-40°C ~ 125°C	8-SOIC	Active
LM431AIMX	National Semiconductor	2.5V	36V	100 mA	±2%	-40°C ~ 85°C	8-SOIC	Active
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	-25°C ~ 85°C	8-SOIC	Active
LM431CIMX	onsemi	2.495V	36V	100 mA	±0.5%	-40°C ~ 85°C	8-SOIC	Active
NCV431AIDR2G	onsemi	2.495V	36V	100 mA	±1%	-40°C ~ 125°C	8-SOIC	Active
TL1431ACDT	STMicroelectronics	2.5V	36V	100 mA	±0.25%	-20°C ~ 70°C	8-SOIC	Active

Engineering Selection Recommendations

Primary Substitutes (Equivalent Tolerance & Temperature Range):

TL431IDT and TL431IYDT from STMicroelectronics provide direct electrical equivalence to the TL431CDRE4 with tolerance specifications of ±2.21%, matching the original ±2.2% tolerance. Both devices maintain the 8-SOIC package and 100 mA output current. TL431IDT operates across -40°C ~ 105°C, while TL431IYDT extends to -40°C ~ 125°C and includes AEC-Q100 automotive qualification. These parts are active products with high inventory availability.

Upgraded Substitutes (Improved Tolerance):

LM431BCM/NOPB and LM431BCMX/NOPB offer ±1% tolerance, representing a precision upgrade from the original ±2.2% specification. Both maintain 2.495V minimum output voltage and 100 mA current capacity in 8-SOIC packaging. LM431BCM/NOPB is manufactured by Texas Instruments with active product status. LM431BCMX is supplied by National Semiconductor and remains active.

LM431CIMX from onsemi provides the highest precision option at ±0.5% tolerance, suitable for applications requiring enhanced voltage regulation accuracy. This part maintains full electrical compatibility with 2.495V output and 100 mA current rating across -40°C ~ 85°C operating range.

Extended Temperature Range Substitutes:

NCV431AIDR2G from onsemi combines ±1% tolerance with -40°C ~ 125°C operating range and includes AEC-Q100 automotive qualification. This part is suitable for applications requiring both precision and extended thermal performance.

Compliance & Availability:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. Inventory availability ranges from 1,200 to 100,200 units across substitute options, ensuring production continuity.

Frequently Asked Questions (FAQ)

Q: Can LM431BCM/NOPB directly replace TL431CDRE4 in existing designs?

A: Yes. LM431BCM/NOPB is a direct pin-compatible substitute in 8-SOIC packaging with identical output current (100 mA) and minimum voltage (2.495V). The ±1% tolerance represents improved accuracy compared to the original ±2.2% specification. Operating temperature range remains 0°C ~ 70°C compatible.

Q: What is the difference between TL431IDT and TL431IYDT?

A: Both parts share identical electrical specifications (±2.21% tolerance, 2.495V output, 100 mA current) and 8-SOIC packaging. TL431IDT operates across -40°C ~ 105°C, while TL431IYDT extends to -40°C ~ 125°C and includes AEC-Q100 automotive qualification. Selection depends on thermal requirements and automotive compliance needs.

Q: Is LM431CIMX suitable for high-precision applications?

A: Yes. LM431CIMX provides ±0.5% tolerance, the highest precision among available substitutes. It maintains 2.495V output voltage and 100 mA current in 8-SOIC packaging across -40°C ~ 85°C. This part is recommended for applications requiring enhanced voltage regulation accuracy beyond the original ±2.2% specification.

Q: Are all substitute parts available in 8-SOIC packaging?

A: Yes. All listed substitute parts are packaged in 8-SOIC (0.154", 3.90mm Width) form factor, ensuring direct PCB compatibility with the original TL431CDRE4 design without layout modifications.

Q: What compliance certifications apply to these substitutes?

A: All substitute parts maintain ROHS3 compliance. NCV431AIDR2G and TL431IYDT include AEC-Q100 automotive qualification. REACH status is unaffected for all parts except LM431AIMX, which is REACH affected.

Q: Can I use NCV431AIDR2G in automotive applications?

A: Yes. NCV431AIDR2G is qualified to AEC-Q100 automotive standards and operates across -40°C ~ 125°C with ±1% tolerance. This part is specifically designed for automotive voltage reference applications.

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