TL431BIDRG4 Equivalent & Substitute Parts

Part Overview

The TL431BIDRG4 is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device operates across a 2.495V to 36V output range with ±0.5% tolerance and supports 100 mA output current in an 8-SOIC surface mount package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL431BIDRG4
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage Output (Min)	2.495V
Voltage Output (Max)	36V
Current Output	100 mA
Tolerance	±0.5%
Current Cathode	700 µA
Operating Temperature	-40°C to 85°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TL431BIDRG4 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Package type: 8-SOIC form factor (0.154", 3.90mm Width)
Reference type: Shunt configuration
Output type: Adjustable
Output current: 100 mA
Voltage output range: Minimum 2.495V, Maximum 36V or higher
Operating temperature range: -40°C to 85°C or wider
Surface mount mounting type

Tolerance Considerations: Substitute parts with tolerance specifications of ±0.5% or tighter (±1%, ±2.2%) are direct functional replacements. Parts with looser tolerances may be acceptable depending on circuit design requirements.

Cathode Current: The original part specifies 700 µA cathode current. Substitute parts with 1 mA cathode current remain functionally compatible within the shunt reference architecture.

Parameter Comparison

Part Number	Manufacturer	Voltage Min	Voltage Max	Current Output	Tolerance	Cathode Current	Temp Range	Status
TL431BIDRG4	Texas Instruments	2.495V	36V	100 mA	±0.5%	700 µA	-40°C to 85°C	Obsolete
TL431BIDR	Texas Instruments	2.495V	36V	100 mA	±0.5%	700 µA	-40°C to 85°C	Active
LM431CIM/NOPB	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	1 mA	-40°C to 85°C	Active
LM431AIM/NOPB	Texas Instruments	2.495V	37V	100 mA	±2.2%	1 mA	-40°C to 85°C	Active
LM431AIMX/NOPB	Texas Instruments	2.495V	37V	100 mA	±2.2%	1 mA	-40°C to 85°C	Active
LM431BIM/NOPB	Texas Instruments	2.495V	37V	100 mA	±1%	1 mA	-40°C to 85°C	Active
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	1 mA	-25°C to 85°C	Active
LM431AIMX	National Semiconductor	2.5V	36V	100 mA	±2%	1 mA	-40°C to 85°C	Active
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C to 85°C	Active
LM431CIMX	onsemi	2.495V	36V	100 mA	±0.5%	1 mA	-40°C to 85°C	Active
NCV431AIDR2G	onsemi	2.495V	36V	100 mA	±1%	1 mA	-40°C to 125°C	Active

Engineering Selection Recommendations

Primary Recommendation: TL431BIDR

The TL431BIDR is the direct active equivalent to the obsolete TL431BIDRG4. Both parts share identical electrical specifications: 2.495V minimum output, 36V maximum output, ±0.5% tolerance, and 700 µA cathode current. The TL431BIDR maintains active product status with ROHS3 compliance and unlimited MSL rating. This part is available in Cut Tape and Digi-Reel packaging with 55,200 units in stock.

Secondary Recommendations by Application Requirements:

For applications requiring tighter tolerance specifications, the LM431CIMX (onsemi) provides ±0.5% tolerance matching the original part, with active status and ROHS3 compliance. This part operates across the full -40°C to 85°C temperature range.

For automotive-grade applications, the NCV431AIDR2G (onsemi) offers AEC-Q100 qualification and extended temperature range to 125°C, with ±1% tolerance and active product status.

For general-purpose applications where ±1% tolerance is acceptable, the LM431BIM/NOPB (Texas Instruments) or LM431BCMX (National Semiconductor) provide cost-effective alternatives with active status and ROHS3 compliance.

All recommended substitutes maintain the 8-SOIC package form factor, 100 mA output current capability, and surface mount mounting type required for direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TL431BIDRG4 with TL431BIDR on my PCB?

A: Yes. The TL431BIDR is the active equivalent with identical electrical specifications and package form factor. No circuit modifications are required.

Q: What is the difference between the TL431BIDR and LM431CIMX?

A: Both parts share ±0.5% tolerance and identical voltage output ranges. The primary difference is manufacturer: TL431BIDR is Texas Instruments, while LM431CIMX is onsemi. Both are ROHS3 compliant and operate across -40°C to 85°C.

Q: Can I use a part with ±2.2% tolerance instead of ±0.5%?

A: Substitution depends on your circuit design tolerance requirements. Parts like LM431AIM/NOPB and LM431AIMX/NOPB with ±2.2% tolerance are electrically compatible but introduce greater output voltage variation. Verify your application can tolerate this increased tolerance before substitution.

Q: What is the difference between 700 µA and 1 mA cathode current specifications?

A: Both specifications are compatible within shunt reference architecture. The 1 mA cathode current in substitute parts represents a minor operational difference that does not affect functional compatibility in standard reference circuit applications.

Q: Is the NCV431AIDR2G suitable for non-automotive applications?

A: Yes. The NCV431AIDR2G is AEC-Q100 qualified for automotive use but functions as a standard shunt reference in any application. Its extended temperature range (-40°C to 125°C) and ±1% tolerance make it suitable for industrial and general-purpose designs.

Q: Do all substitute parts use the same 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring direct PCB compatibility without layout modifications.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT), Tape & Reel (TR), Tube, Bulk, and Digi-Reel. Select packaging based on your procurement volume and assembly process requirements.

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