TL431IDR2G Equivalent & Substitute Parts

Part Overview

The TL431IDR2G is a shunt voltage reference IC manufactured by onsemi, designed for precision voltage regulation and reference applications. This adjustable reference operates across a 2.495V to 36V output range with ±2.2% tolerance and supports output currents up to 100 mA. The device is housed in an 8-SOIC surface mount package and is actively produced with ROHS3 compliance.

Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging or temperature specifications are required, or when enhanced performance characteristics (tighter tolerance, lower noise) are needed for specific circuit requirements.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	TL431IDR2G
Reference Type	Shunt
Output Type	Adjustable
Voltage Output (Min)	2.495V
Voltage Output (Max)	36V
Output Current	100 mA
Tolerance	±2.2%
Temperature Coefficient	50 ppm/°C Typical
Cathode Current	1 mA
Operating Temperature	-40°C to 85°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TL431IDR2G is determined by the following critical parameters:

Mandatory Compatibility Parameters:

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

Allowable Variation Parameters:

Voltage Output Range: Minimum 2.495V to 2.5V; Maximum 36V to 37V
Tolerance: ±2.2% or tighter (±2%, ±1%, ±0.5%, ±0.25%)
Temperature Coefficient: 50 ppm/°C to 100 ppm/°C
Operating Temperature: -40°C to 85°C or wider ranges
Product Status: Active or equivalent active production status
RoHS/REACH Compliance: ROHS3 Compliant preferred; RoHS non-compliant parts noted

Substitute parts are grouped into two categories: Direct Substitutes (identical electrical specifications with different packaging or manufacturer) and Similar Substitutes (enhanced or slightly different electrical characteristics within acceptable parameters).

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min/Max)	Tolerance	Temp Coeff	Operating Temp	Cathode Current	Product Status	RoHS Status	Packaging
TL431IDR2G	onsemi	2.495V / 36V	±2.2%	50 ppm/°C	-40°C to 85°C	1 mA	Active	ROHS3	Tape & Reel
TL431CDR2G	onsemi	2.495V / 36V	±2.2%	50 ppm/°C	0°C to 70°C	1 mA	Active	ROHS3	Tape & Reel
TL431IDR	Texas Instruments	2.495V / 36V	±2.2%	Not specified	-40°C to 85°C	1 mA	Active	ROHS3	Cut Tape & Digi-Reel
KA431DTF	onsemi	2.5V / 36V	±2%	50 ppm/°C	-25°C to 85°C	1 mA	Active	ROHS3	Not specified
LM431AIMX	National Semiconductor	2.5V / 36V	±2%	50 ppm/°C	-40°C to 85°C	1 mA	Active	Non-compliant	Bulk
LM431BCMX	National Semiconductor	2.495V / 36V	±1%	50 ppm/°C	-25°C to 85°C	1 mA	Active	Not specified	Not specified
LM431CCMX	Texas Instruments	2.5V / 37V	-0.6%, +0.4%	50 ppm/°C	0°C to 70°C	1 mA	Obsolete	ROHS3	Tape & Reel
LM431CIMX	onsemi	2.495V / 36V	±0.5%	50 ppm/°C	-40°C to 85°C	1 mA	Active	ROHS3	Not specified
TL1431ACDT	STMicroelectronics	2.5V / 36V	±0.25%	90 ppm/°C	-20°C to 70°C	600 µA	Active	ROHS3	Cut Tape & Digi-Reel
TL1431AIDT	STMicroelectronics	2.5V / 36V	±0.25%	100 ppm/°C	-40°C to 105°C	700 µA	Active	ROHS3	Cut Tape & Digi-Reel
TL1431AIYDT	STMicroelectronics	2.5V / 36V	±0.25%	100 ppm/°C	-40°C to 125°C	700 µA	Active	ROHS3	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Performance):

TL431CDR2G and TL431IDR are direct electrical equivalents to TL431IDR2G. TL431CDR2G operates within a narrower temperature range (0°C to 70°C) compared to the primary part (-40°C to 85°C), making it suitable for commercial-grade applications with restricted thermal requirements. TL431IDR from Texas Instruments provides identical electrical specifications and is available in higher volume (50,200 pcs in stock).

Enhanced Performance Substitutes (Tighter Tolerance):

LM431BCMX offers ±1% tolerance versus the primary part's ±2.2%, providing improved output voltage accuracy. LM431CIMX delivers ±0.5% tolerance with identical voltage range and temperature coefficient. The TL1431 series (ACDT, AIDT, AIYDT) from STMicroelectronics provides the tightest tolerance at ±0.25%, suitable for precision reference applications. These enhanced-tolerance parts maintain the 100 mA output current and 1 mA cathode current specifications.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance except LM431AIMX, which is RoHS non-compliant and REACH-affected. LM431CCMX is marked as obsolete and should be avoided for new designs despite active inventory.

Temperature Range Considerations:

For applications requiring extended low-temperature operation below -40°C or high-temperature operation above 85°C, TL1431AIYDT supports -40°C to 125°C with automotive-grade qualification (AEC-Q100).

Frequently Asked Questions (FAQ)

Q: Can TL431CDR2G replace TL431IDR2G in all applications?

A: TL431CDR2G is electrically identical but operates only from 0°C to 70°C versus -40°C to 85°C for TL431IDR2G. It is suitable for commercial-grade applications within this narrower temperature window. Verify your circuit's operating temperature requirements before substitution.

Q: What is the difference between TL431 and LM431 series?

A: Both are shunt voltage reference ICs with identical functional characteristics (adjustable output, 100 mA current, 1 mA cathode current). They differ by manufacturer (onsemi vs. National Semiconductor/Texas Instruments) and tolerance grades. Electrical performance is equivalent within specified tolerances.

Q: Are the TL1431 parts from STMicroelectronics compatible with TL431IDR2G?

A: TL1431 parts are functionally compatible but have different cathode current specifications (600-700 µA versus 1 mA) and tighter tolerance (±0.25% versus ±2.2%). They are suitable for precision applications but may require circuit redesign if cathode current biasing is critical.

Q: Why does LM431AIMX show RoHS non-compliant status?

A: LM431AIMX is a legacy part from National Semiconductor that predates current RoHS3 compliance requirements. For new designs requiring regulatory compliance, select ROHS3-compliant alternatives such as TL431IDR, TL431CDR2G, or the STMicroelectronics TL1431 series.

Q: Can I use KA431DTF as a direct replacement?

A: KA431DTF is functionally equivalent with ±2% tolerance (versus ±2.2%) and operates from -25°C to 85°C. It is suitable for most applications but has a slightly narrower low-temperature range. Verify packaging availability, as supplier device package information is not fully specified.

Q: What is the advantage of selecting TL1431AIYDT over TL431IDR2G?

A: TL1431AIYDT provides ±0.25% tolerance (versus ±2.2%), extended temperature range to 125°C, and automotive-grade qualification (AEC-Q100). Select this part for precision reference circuits or automotive applications requiring enhanced accuracy and thermal performance.

Q: Are there inventory considerations when selecting substitutes?

A: Yes. TL431IDR (Texas Instruments) has the highest inventory at 50,200 pcs. TL431CDR2G (onsemi) has 17,614 pcs. LM431BCMX has 26,067 pcs. Verify current availability with your supplier, as inventory levels change.

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