TL431IDRG4 Equivalent & Substitute Parts

Part Overview

The TL431IDRG4 is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device operates with a fixed output voltage of 2.495V and maximum output voltage of 36V, delivering up to 100mA with ±2.2% tolerance. The part is packaged in 8-SOIC surface mount configuration and 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	TL431IDRG4
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100mA
Tolerance	±2.2%
Current - Cathode	1mA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TL431IDRG4 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Reference Type: Shunt
Output Type: Adjustable
Voltage - Output (Min/Fixed): 2.495V
Voltage - Output (Max): 36V or higher
Current - Output: 100mA
Current - Cathode: 1mA
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: Minimum -40°C ~ 85°C

Tolerance Consideration: The TL431IDRG4 specifies ±2.2% tolerance. Substitute parts with equal or tighter tolerance (lower percentage) are electrically compatible. Parts with looser tolerance do not meet the original specification.

Product Status: The TL431IDRG4 is obsolete. Active substitute parts are preferred for new designs and ongoing procurement. Obsolete substitute parts should be avoided unless inventory constraints require their use.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Operating Temp	Package	Product Status	Packaging Type
TL431IDRG4	Texas Instruments	2.495V	36V	100mA	±2.2%	-40°C ~ 85°C	8-SOIC	Obsolete	Tape & Reel (TR)
TL431IDR	Texas Instruments	2.495V	36V	100mA	±2.2%	-40°C ~ 85°C	8-SOIC	Active	Cut Tape (CT) & Digi-Reel®
LM431AIM/NOPB	Texas Instruments	2.495V	37V	100mA	±2.2%	-40°C ~ 85°C	8-SOIC	Active	Tube
LM431AIMX/NOPB	Texas Instruments	2.495V	37V	100mA	±2.2%	-40°C ~ 85°C	8-SOIC	Active	Tape & Reel (TR)
LM431BIM/NOPB	Texas Instruments	2.495V	37V	100mA	±1%	-40°C ~ 85°C	8-SOIC	Active	Tube
TL431IDT	STMicroelectronics	2.495V	36V	100mA	±2.21%	-40°C ~ 105°C	8-SOIC	Active	Cut Tape (CT) & Digi-Reel®
TL431IYDT	STMicroelectronics	2.495V	36V	100mA	±2.21%	-40°C ~ 125°C	8-SOIC	Active	Cut Tape (CT) & Digi-Reel®
KA431DTF	onsemi	2.5V	36V	100mA	±2%	-25°C ~ 85°C	8-SOIC	Active	-
LM431AIMX	National Semiconductor	2.5V	36V	100mA	±2%	-40°C ~ 85°C	8-SOIC	Active	Bulk
LM431BCMX	National Semiconductor	2.495V	36V	100mA	±1%	-25°C ~ 85°C	8-SOIC	Active	-
LM431CIMX	onsemi	2.495V	36V	100mA	±0.5%	-40°C ~ 85°C	8-SOIC	Active	-

Engineering Selection Recommendations

Primary Recommendation: TL431IDR

The TL431IDR is the direct active equivalent from Texas Instruments. It maintains identical electrical specifications to the TL431IDRG4 (2.495V output, 36V maximum, ±2.2% tolerance, -40°C ~ 85°C operating range) and uses the same 8-SOIC package. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). This part is currently in active production status with high inventory availability (50,200 units), making it the preferred choice for design continuity and procurement reliability.

Secondary Recommendations: LM431AIMX/NOPB and LM431AIM/NOPB

Both LM431 variants from Texas Instruments provide equivalent electrical performance with a marginal increase in maximum output voltage (37V versus 36V). The ±2.2% tolerance matches the original specification. These parts are active and widely available. LM431AIMX/NOPB is supplied in Tape & Reel format (8,767 units in stock), while LM431AIM/NOPB is supplied in Tube format (1,760 units in stock). Both operate across the -40°C ~ 85°C temperature range.

Higher Precision Alternative: LM431BIM/NOPB and LM431CIMX

For applications requiring tighter tolerance, LM431BIM/NOPB offers ±1% tolerance and LM431CIMX offers ±0.5% tolerance. Both maintain the 2.495V output and 100mA current specifications. These parts are suitable when the original ±2.2% tolerance is unnecessarily loose for the application. LM431BIM/NOPB is available in Tube format (1,265 units), and LM431CIMX is available in bulk format (1,810 units).

Extended Temperature Range Option: TL431IYDT

The TL431IYDT from STMicroelectronics extends the operating temperature range to -40°C ~ 125°C and includes AEC-Q100 automotive qualification. This part maintains the 2.495V output, 36V maximum, and ±2.21% tolerance. It is suitable for automotive and high-temperature applications. Inventory is substantial (100,200 units).

Cross-Manufacturer Options: KA431DTF and LM431AIMX

The KA431DTF from onsemi and LM431AIMX from National Semiconductor provide functional equivalence with minor specification variations. KA431DTF specifies 2.5V output (versus 2.495V) and ±2% tolerance with a narrower operating temperature range (-25°C ~ 85°C). LM431AIMX also specifies 2.5V output and ±2% tolerance. These parts are suitable when the 0.005V output difference and tighter tolerance are acceptable for the application.

Compliance Considerations:

All recommended substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental qualifications. The TL431IDRG4 is obsolete; active parts should be prioritized for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use LM431AIMX/NOPB as a direct replacement for TL431IDRG4?

A: Yes. The LM431AIMX/NOPB maintains the same reference type (shunt), output type (adjustable), minimum output voltage (2.495V), current output (100mA), cathode current (1mA), tolerance (±2.2%), operating temperature range (-40°C ~ 85°C), and 8-SOIC package. The maximum output voltage is 37V versus 36V, which is a beneficial specification increase. The part is active and widely available.

Q: What is the difference between TL431IDR and TL431IDRG4?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: TL431IDR is supplied in Cut Tape & Digi-Reel® format, while TL431IDRG4 is supplied in Tape & Reel format. TL431IDR is currently active in production, whereas TL431IDRG4 is obsolete. For new procurement, TL431IDR is the recommended choice.

Q: Can I substitute a part with ±1% tolerance for the ±2.2% tolerance original?

A: Yes. Parts with tighter (lower) tolerance are electrically compatible and suitable for substitution. LM431BIM/NOPB and LM431BCMX both offer ±1% tolerance and meet all other electrical and mechanical requirements. Tighter tolerance provides improved accuracy and is generally beneficial for precision applications.

Q: Is the 0.005V difference between 2.495V and 2.5V output significant?

A: The difference between 2.495V and 2.5V output is 0.2%, which is within the tolerance specifications of both parts. For most applications, this difference is negligible. However, if your circuit design requires the exact 2.495V specification, select parts explicitly rated at 2.495V (TL431IDR, LM431AIM/NOPB, LM431AIMX/NOPB, LM431BIM/NOPB, TL431IDT, TL431IYDT, LM431BCMX, LM431CIMX) rather than 2.5V variants.

Q: Which substitute part has the widest operating temperature range?

A: The TL431IYDT from STMicroelectronics operates across -40°C ~ 125°C, providing the widest temperature range. This part also includes AEC-Q100 automotive qualification. It is suitable for high-temperature and automotive applications where extended temperature performance is required.

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

A: Yes. All substitute parts listed are packaged in 8-SOIC (0.154", 3.90mm Width) surface mount configuration, matching the original TL431IDRG4 package specification. Packaging format (Tape & Reel, Cut Tape, Tube, or Bulk) varies by part number but does not affect electrical compatibility or PCB mounting.

Q: What is the difference between LM431AIMX and LM431AIMX/NOPB?

A: Both parts are functionally equivalent. The "/NOPB" designation indicates "No Plumbum" (lead-free) compliance. LM431AIMX/NOPB is ROHS3 compliant, while LM431AIMX is listed as RoHS non-compliant. For new designs, LM431AIMX/NOPB is the preferred choice due to environmental compliance.

Q: Can I use KA431DTF if my circuit operates below -25°C?

A: No. The KA431DTF specifies an operating temperature range of -25°C ~ 85°C, which does not include temperatures below -25°C. If your application requires operation at -40°C, select a substitute part with -40°C minimum operating temperature, such as TL431IDR, LM431AIM/NOPB, LM431AIMX/NOPB, LM431AIMX, TL431IDT, TL431IYDT, or LM431CIMX.

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