TL431AIDRG4 Equivalent & Substitute Parts

Part Overview

The TL431AIDRG4 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 100mA output current with ±1% tolerance. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain core electrical specifications while offering active product status and improved availability.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100mA
Tolerance	±1%
Current - Cathode	700µA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TL431AIDRG4 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Substitution:

Reference type (Shunt)
Output type (Adjustable)
Minimum output voltage (2.495V or compatible)
Maximum output voltage (36V or higher)
Output current capability (100mA)
Package type (8-SOIC)
Operating temperature range (-40°C ~ 85°C minimum)
Tolerance specification (±1% or tighter)

Substitute parts are grouped into two categories:

Direct Equivalents (Same Manufacturer - Texas Instruments): Parts that maintain identical electrical specifications and differ only in packaging format or product status. These include TL431AIDR (active status, cut tape packaging) and TL431AIDT (STMicroelectronics variant with extended temperature range to 105°C).

Functional Equivalents (Alternative Manufacturers): Parts from Texas Instruments (LM431 series), onsemi (KA431DTF, LM431CIMX), and National Semiconductor (LM431AIMX, LM431BCMX) that meet core electrical requirements. These parts maintain the 8-SOIC package, 100mA output current, and adjustable output voltage characteristics. Tolerance specifications vary (±0.5% to ±2.2%), and some variants feature extended maximum output voltage (37V) or different cathode current specifications (1mA vs 700µA).

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Product Status
TL431AIDRG4	Texas Instruments	2.495V	36V	100mA	±1%	700µA	-40°C ~ 85°C	Obsolete
TL431AIDR	Texas Instruments	2.495V	36V	100mA	±1%	700µA	-40°C ~ 85°C	Active
TL431AIDT	STMicroelectronics	2.495V	36V	100mA	±1%	700µA	-40°C ~ 105°C	Active
LM431AIM/NOPB	Texas Instruments	2.495V	37V	100mA	±2.2%	1mA	-40°C ~ 85°C	Active
LM431AIMX/NOPB	Texas Instruments	2.495V	37V	100mA	±2.2%	1mA	-40°C ~ 85°C	Active
LM431BIM/NOPB	Texas Instruments	2.495V	37V	100mA	±1%	1mA	-40°C ~ 85°C	Active
LM431CIM/NOPB	Texas Instruments	2.5V	37V	100mA	-0.6%, +0.4%	1mA	-40°C ~ 85°C	Active
KA431DTF	onsemi	2.5V	36V	100mA	±2%	1mA	-25°C ~ 85°C	Active
LM431AIMX	National Semiconductor	2.5V	36V	100mA	±2%	1mA	-40°C ~ 85°C	Active
LM431BCMX	National Semiconductor	2.495V	36V	100mA	±1%	1mA	-25°C ~ 85°C	Active
LM431CIMX	onsemi	2.495V	36V	100mA	±0.5%	1mA	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Primary Recommendation: TL431AIDR (Texas Instruments) provides direct electrical equivalence to the TL431AIDRG4 with identical specifications and active product status. This part is the preferred choice for direct replacement in existing designs.

Extended Temperature Alternative: TL431AIDT (STMicroelectronics) maintains all electrical specifications of the original part while extending the operating temperature range to -40°C ~ 105°C. This variant is suitable for applications requiring enhanced thermal performance.

Tighter Tolerance Option: LM431CIMX (onsemi) offers ±0.5% tolerance, providing superior voltage accuracy compared to the original ±1% specification. This part maintains the 2.495V minimum output voltage and 36V maximum output voltage, with active product status and ROHS3 compliance.

Cost-Optimized Alternatives: LM431AIM/NOPB and LM431AIMX/NOPB (Texas Instruments) provide functional equivalence with ±2.2% tolerance and extended maximum output voltage (37V). These parts are suitable for applications where tolerance relaxation is acceptable.

Compliance Considerations: All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original TL431AIDRG4. All parts are surface mount 8-SOIC packages with identical mechanical footprints.

Frequently Asked Questions (FAQ)

Q: Can TL431AIDR be used as a direct replacement for TL431AIDRG4?

A: Yes. TL431AIDR is electrically and mechanically identical to TL431AIDRG4, with the primary difference being active product status versus obsolete status. Both parts share identical voltage specifications (2.495V minimum, 36V maximum), 100mA output current, ±1% tolerance, 700µA cathode current, and 8-SOIC packaging.

Q: What is the difference between TL431AIDR and LM431BIM/NOPB?

A: Both parts maintain ±1% tolerance and 100mA output current. Key differences include: LM431BIM/NOPB has extended maximum output voltage (37V vs 36V), higher cathode current (1mA vs 700µA), and is manufactured by Texas Instruments under the LM431 series designation. The 8-SOIC package and operating temperature range (-40°C ~ 85°C) are identical.

Q: Is LM431CIMX suitable for applications requiring higher accuracy?

A: Yes. LM431CIMX offers ±0.5% tolerance, which is tighter than the original TL431AIDRG4 specification of ±1%. This part maintains the 2.495V minimum output voltage, 36V maximum output voltage, 100mA output current, and 8-SOIC package. It is manufactured by onsemi with active product status and ROHS3 compliance.

Q: What are the package compatibility considerations?

A: All substitute parts listed use the 8-SOIC package (0.154", 3.90mm width), ensuring mechanical and electrical compatibility with existing PCB layouts designed for the TL431AIDRG4. No PCB redesign is required for package substitution.

Q: Can KA431DTF be used in applications with extended low-temperature operation?

A: KA431DTF has a minimum operating temperature of -25°C, which is higher than the original TL431AIDRG4 specification of -40°C. This part is not suitable for applications requiring operation below -25°C. For extended low-temperature requirements, use TL431AIDR, TL431AIDT, or LM431 series alternatives with -40°C minimum operating temperature.

Q: What is the significance of cathode current differences between substitute parts?

A: The original TL431AIDRG4 specifies 700µA cathode current, while most substitute parts (LM431 series) specify 1mA. This difference affects circuit biasing and reference stability. For applications sensitive to cathode current specifications, TL431AIDR or TL431AIDT maintain the original 700µA specification. For other applications, the 1mA specification is functionally compatible within standard design margins.

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