TL431CDG4 Equivalent & Substitute Parts

Part Overview

The TL431CDG4 is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device operates with a 2.495V minimum output, 36V maximum output, and delivers 100 mA output current with ±2.2% tolerance. The device is marked as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 8-SOIC surface mount package and adjustable output topology define the functional requirements for direct substitution.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±2.2%
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL431CDG4 is determined by strict electrical and mechanical compatibility. All substitute parts must maintain the following core parameters:

Reference type: Shunt topology
Output type: Adjustable configuration
Output voltage range: Minimum 2.495V or lower, maximum 36V or higher
Output current: 100 mA minimum
Cathode current: 1 mA
Package: 8-SOIC form factor with 0.154" (3.90mm) width
Mounting: Surface mount technology

Tolerance variations (±2.2%, ±2.21%, ±2%, ±1%, ±0.5%) are acceptable within the same functional class, as tighter tolerances represent performance improvements. Operating temperature range extensions are acceptable for applications requiring wider thermal operation. Product status (active vs. obsolete) and compliance certifications (RoHS, REACH, AEC-Q100) are secondary selection criteria based on application requirements.

Parameter Comparison

Part Number	Manufacturer	Output (Min)	Output (Max)	Current	Tolerance	Temp Range	Package	Status	RoHS
TL431CDG4	Texas Instruments	2.495V	36V	100 mA	±2.2%	0°C ~ 70°C	8-SOIC	Obsolete	ROHS3
TL431CD	Fairchild Semiconductor	2.495V	36V	100 mA	±2.21%	-25°C ~ 85°C	8-SOIC	Obsolete	Non-compliant
LM431BCM/NOPB	Texas Instruments	2.495V	37V	100 mA	±1%	0°C ~ 70°C	8-SOIC	Active	ROHS3
LM431BCMX/NOPB	National Semiconductor	2.495V	37V	100 mA	±1%	0°C ~ 70°C	8-SOIC	Active	Not specified
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	-25°C ~ 85°C	8-SOIC	Active	ROHS3
TL431IDT	STMicroelectronics	2.495V	36V	100 mA	±2.21%	-40°C ~ 105°C	8-SOIC	Active	ROHS3
TL431IYDT	STMicroelectronics	2.495V	36V	100 mA	±2.21%	-40°C ~ 125°C	8-SOIC	Active	ROHS3
LM431AIMX	National Semiconductor	2.5V	36V	100 mA	±2%	-40°C ~ 85°C	8-SOIC	Active	Non-compliant
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	-25°C ~ 85°C	8-SOIC	Active	Not specified
LM431CIMX	onsemi	2.495V	36V	100 mA	±0.5%	-40°C ~ 85°C	8-SOIC	Active	ROHS3
NCV431AIDR2G	onsemi	2.495V	36V	100 mA	±1%	-40°C ~ 125°C	8-SOIC	Active	ROHS3

Engineering Selection Recommendations

For direct replacement of the obsolete TL431CDG4, the following selection criteria apply:

Primary Recommendation (Identical Specifications): TL431IDT and TL431IYDT from STMicroelectronics maintain the exact output voltage range (2.495V to 36V), tolerance (±2.21%), and 8-SOIC package. Both are active products with ROHS3 compliance. TL431IYDT extends the operating temperature to -40°C ~ 125°C and includes AEC-Q100 automotive qualification, suitable for extended thermal environments.

Active Alternatives with Improved Tolerance: LM431BCM/NOPB and LM431BCMX/NOPB deliver ±1% tolerance (tighter than the original ±2.2%), matching the 2.495V minimum output and 37V maximum output. Both maintain 8-SOIC packaging and are active products. LM431BCM/NOPB is Texas Instruments sourced with ROHS3 compliance.

Automotive-Grade Option: NCV431AIDR2G from onsemi provides ±1% tolerance, -40°C ~ 125°C operating range, and AEC-Q100 qualification. This part is suitable for automotive and extended-temperature applications while maintaining full ROHS3 compliance.

High-Precision Alternative: LM431CIMX from onsemi offers ±0.5% tolerance with 2.495V to 36V output range, representing the tightest tolerance available in this substitution set. Operating range extends to -40°C ~ 85°C with ROHS3 compliance.

Extended Temperature Range: KA431DTF from onsemi provides -25°C ~ 85°C operation with ±2% tolerance and ROHS3 compliance, suitable for applications requiring wider thermal operation than the original 0°C ~ 70°C specification.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with tighter tolerance than the TL431CDG4? A: Yes. Tighter tolerance specifications (±1%, ±0.5%) represent improved performance and are electrically compatible. Parts such as LM431BCM/NOPB (±1%) and LM431CIMX (±0.5%) are direct functional upgrades.

Q: Are all substitute parts available in the same 8-SOIC package? A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical compatibility without PCB redesign.

Q: What is the difference between TL431IDT and TL431IYDT? A: Both are STMicroelectronics products with identical electrical specifications (2.495V to 36V, ±2.21%, 100 mA). TL431IYDT extends the operating temperature range to -40°C ~ 125°C and includes AEC-Q100 automotive qualification, making it suitable for automotive and high-temperature applications.

Q: Which substitute part has the best compliance status? A: Multiple parts offer ROHS3 compliance: TL431IDT, TL431IYDT, KA431DTF, LM431CIMX, and NCV431AIDR2G. For RoHS non-compliant applications, LM431AIMX and LM431BCM/NOPB are available, though the latter is ROHS3 compliant.

Q: Can I use LM431AIMX as a direct replacement? A: LM431AIMX is electrically compatible with 2.5V minimum output, 36V maximum output, ±2% tolerance, and 100 mA current. However, it is RoHS non-compliant and operates at -40°C ~ 85°C. Use only if RoHS compliance is not required and thermal range is acceptable.

Q: What is the minimum output voltage difference between substitute parts? A: Most parts specify 2.495V minimum output. KA431DTF and LM431AIMX specify 2.5V minimum, a 5mV difference. This is negligible for most adjustable reference applications where external resistor networks set the final output voltage.

Q: Are there automotive-qualified alternatives? A: Yes. TL431IYDT and NCV431AIDR2G both carry AEC-Q100 qualification and support -40°C ~ 125°C operation, meeting automotive temperature and reliability standards.

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