TL1431CDRE4 Equivalent & Substitute Parts

Part Overview

The TL1431CDRE4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This device provides a 2.5V to 36V adjustable output with ±0.4% tolerance and 100 mA output current capability in an 8-SOIC surface mount package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Active alternatives from multiple manufacturers provide direct functional replacement with enhanced specifications and improved availability.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL1431CDRE4
Category	Power Management (PMIC)
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	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TL1431CDRE4 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt
Output Type: Adjustable
Voltage Output Range: 2.5V minimum, 36V maximum
Current Output: 100 mA
Current Cathode: 1 mA
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Tolerance Considerations: The original part specifies ±0.4% tolerance. Substitute parts with equal or tighter tolerance (lower percentage) maintain or improve accuracy. Parts with wider tolerance (higher percentage) represent functional alternatives where tolerance relaxation is acceptable.

Temperature Range: The original part operates 0°C ~ 70°C. Substitute parts with equal or extended temperature ranges provide direct replacement. Parts with narrower ranges require application verification.

Compliance & Status: Active product status ensures ongoing availability and manufacturer support. RoHS3 compliance and MSL ratings must match application requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min/Max)	Current Output	Tolerance	Operating Temp	Product Status	Packaging
TL1431CDRE4	Texas Instruments	2.5V / 36V	100 mA	±0.4%	0°C ~ 70°C	Obsolete	8-SOIC (TR)
TL1431CDR	Texas Instruments	2.5V / 36V	100 mA	±0.4%	0°C ~ 70°C	Active	8-SOIC (TR)
TL1431CDT	STMicroelectronics	2.5V / 36V	100 mA	±0.4%	-20°C ~ 70°C	Active	8-SOIC (TR)
TL1431IDT	STMicroelectronics	2.5V / 36V	100 mA	±0.4%	-40°C ~ 105°C	Active	8-SOIC (CT)
TL1431IYDT	STMicroelectronics	2.5V / 36V	100 mA	±0.4%	-40°C ~ 125°C	Active	8-SOIC (CT)
KA431DTF	onsemi	2.5V / 36V	100 mA	±2%	-25°C ~ 85°C	Active	8-SOIC
LM431AIMX	National Semiconductor	2.5V / 36V	100 mA	±2%	-40°C ~ 85°C	Active	8-SOIC (Bulk)
LM431BCMX	National Semiconductor	2.495V / 36V	100 mA	±1%	-25°C ~ 85°C	Active	8-SOIC
LM431CCMX	Texas Instruments	2.5V / 37V	100 mA	-0.6%, +0.4%	0°C ~ 70°C	Obsolete	8-SOIC (TR)
LM431CIMX	onsemi	2.495V / 36V	100 mA	±0.5%	-40°C ~ 85°C	Active	8-SOIC
NCV431AIDR2G	onsemi	2.495V / 36V	100 mA	±1%	-40°C ~ 125°C	Active	8-SOIC (CT)

Engineering Selection Recommendations

Primary Recommendation: TL1431CDR Direct equivalent from Texas Instruments with identical electrical specifications and active product status. Maintains ±0.4% tolerance and 0°C ~ 70°C operating range. Tape & Reel packaging ensures production compatibility.

Extended Temperature Alternative: TL1431IDT or TL1431IYDT STMicroelectronics alternatives provide expanded operating temperature ranges (-40°C ~ 105°C and -40°C ~ 125°C respectively) while maintaining ±0.4% tolerance. TL1431IYDT includes automotive qualification (AEC-Q100) for applications requiring automotive-grade components.

Tolerance-Relaxed Alternatives: KA431DTF, LM431AIMX onsemi and National Semiconductor options with ±2% tolerance provide functional substitution where tolerance relaxation is acceptable. These parts maintain 100 mA output current and 8-SOIC packaging.

Precision Alternative: LM431CIMX onsemi part with ±0.5% tolerance and extended temperature range (-40°C ~ 85°C) offers improved accuracy over tolerance-relaxed options while maintaining active status.

Compliance Verification: All recommended active substitutes maintain ROHS3 compliance and MSL 1 rating. LM431AIMX is RoHS non-compliant and REACH affected; verify compliance requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can TL1431CDR directly replace TL1431CDRE4? A: Yes. TL1431CDR is the active equivalent with identical electrical specifications (2.5V ~ 36V output, ±0.4% tolerance, 100 mA), same 8-SOIC package, and same operating temperature range (0°C ~ 70°C).

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging? A: Both are surface mount delivery formats. Tape & Reel is standard for high-volume production; Cut Tape is for lower volumes or mixed component orders. Electrical performance is identical.

Q: Can I use a part with ±2% tolerance instead of ±0.4%? A: Only if your application tolerates the wider accuracy specification. KA431DTF and LM431AIMX with ±2% tolerance are functional alternatives but provide less precise voltage reference output.

Q: What does AEC-Q100 qualification mean? A: AEC-Q100 is automotive-grade qualification indicating the part meets automotive reliability and quality standards. TL1431IYDT carries this qualification for automotive applications.

Q: Are there temperature range limitations I should consider? A: The original TL1431CDRE4 operates 0°C ~ 70°C. Extended-range alternatives (TL1431IDT, TL1431IYDT, NCV431AIDR2G) support -40°C ~ 105°C or -40°C ~ 125°C, enabling use in wider environmental conditions.

Q: What is the significance of the 1 mA cathode current specification? A: This is the minimum operating current required for proper voltage reference operation. All listed substitutes maintain this 1 mA specification, ensuring circuit compatibility.

Q: Can I mix manufacturers in production? A: Yes, provided electrical specifications match your application requirements. Verify RoHS and REACH compliance status for each manufacturer's part to ensure regulatory alignment.

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