TL1431CDG4 Equivalent & Substitute Parts

Part Overview

The TL1431CDG4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component provides a fixed 2.5V output with adjustable capability up to 36V, delivering 100 mA output current with ±0.4% tolerance. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across output voltage range, current capacity, tolerance specifications, and 8-SOIC package format.

Key Parameters

Parameter	TL1431CDG4 (Main Part)
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.4%
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TL1431CDG4 are grouped based on the following critical electrical and mechanical parameters that determine functional equivalence:

Primary Substitution Criteria:

Reference Type: Shunt (all substitutes maintain this topology)
Output Type: Adjustable (all substitutes provide adjustable output)
Voltage Range: Minimum 2.5V output, maximum 36V or higher
Current Capacity: 100 mA output current
Package: 8-SOIC form factor with 0.154" width (3.90mm)
Mounting: Surface mount technology
Cathode Current: 1 mA minimum

Tolerance Grouping: Substitutes are categorized by tolerance specification, as this directly impacts circuit accuracy. The main part specifies ±0.4% tolerance. Substitutes with tighter tolerance (±0.4% or ±0.5%) provide direct electrical equivalence. Parts with wider tolerance (±1%, ±2%) function as functional alternatives where tolerance relaxation is acceptable.

Temperature Range Considerations: Operating temperature range varies among substitutes. The main part operates 0°C ~ 70°C. Substitutes with extended ranges (-40°C ~ 105°C or -40°C ~ 125°C) provide enhanced thermal performance for demanding applications.

Product Status Impact: Active status substitutes ensure long-term availability and supply chain continuity. Obsolete substitutes should be avoided for new designs unless inventory constraints require their use.

Parameter Comparison

Part Number	Manufacturer	Voltage Min/Fixed	Voltage Max	Current Output	Tolerance	Temp Coefficient	Operating Temp	Product Status	Package
TL1431CDG4	Texas Instruments	2.5V	36V	100 mA	±0.4%	—	0°C ~ 70°C	Obsolete	8-SOIC
TL1431CD	STMicroelectronics	2.5V	36V	100 mA	±0.4%	90ppm/°C	-20°C ~ 70°C	Obsolete	8-SOIC
TL1431CDT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	90ppm/°C	-20°C ~ 70°C	Active	8-SOIC
TL1431IDT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	100ppm/°C	-40°C ~ 105°C	Active	8-SOIC
TL1431IYDT	STMicroelectronics	2.5V	36V	100 mA	±0.4%	100ppm/°C	-40°C ~ 125°C	Active	8-SOIC
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	50ppm/°C	-25°C ~ 85°C	Active	8-SOIC
LM431AIMX	National Semiconductor	2.5V	36V	100 mA	±2%	50ppm/°C	-40°C ~ 85°C	Active	8-SOIC
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	50ppm/°C	-25°C ~ 85°C	Active	8-SOIC
LM431CCMX	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	50ppm/°C	0°C ~ 70°C	Obsolete	8-SOIC
LM431CIMX	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	-40°C ~ 85°C	Active	8-SOIC
NCV431AIDR2G	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-40°C ~ 125°C	Active	8-SOIC

Engineering Selection Recommendations

Direct Electrical Equivalents (±0.4% Tolerance): TL1431CDT and TL1431IDT from STMicroelectronics provide direct electrical equivalence to the TL1431CDG4. Both maintain ±0.4% tolerance and 8-SOIC packaging. TL1431CDT is available in Tape & Reel packaging with active product status. TL1431IDT extends operating temperature to -40°C ~ 105°C and is available in Cut Tape & Digi-Reel format with 26,198 units in stock, providing superior supply chain continuity.

Automotive-Grade Alternative: TL1431IYDT from STMicroelectronics qualifies as an automotive-grade substitute with AEC-Q100 certification, extended temperature range (-40°C ~ 125°C), and active product status. This part is suitable for applications requiring automotive qualification and thermal robustness.

Tolerance-Relaxed Alternatives: LM431CIMX from onsemi provides ±0.5% tolerance with active status and extended temperature range (-40°C ~ 85°C). NCV431AIDR2G from onsemi offers ±1% tolerance with automotive qualification and -40°C ~ 125°C operating range. These parts function as substitutes where tolerance relaxation is acceptable.

Wider Tolerance Functional Alternatives: KA431DTF and LM431AIMX provide ±2% tolerance with active product status. These parts maintain electrical functionality but with reduced accuracy. KA431DTF operates -25°C ~ 85°C; LM431AIMX extends to -40°C ~ 85°C.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. Obsolete parts (TL1431CD, LM431CCMX) should be avoided for new designs.

Frequently Asked Questions (FAQ)

Q: Can TL1431CDT directly replace TL1431CDG4? A: Yes. TL1431CDT maintains identical electrical specifications (±0.4% tolerance, 2.5V ~ 36V output, 100 mA current) and 8-SOIC packaging. The primary difference is product status (active vs. obsolete) and packaging format (Tape & Reel vs. standard). Electrical performance is equivalent.

Q: What is the difference between TL1431IDT and TL1431CDT? A: Both parts share ±0.4% tolerance and 8-SOIC packaging. TL1431IDT extends operating temperature to -40°C ~ 105°C (vs. -20°C ~ 70°C for TL1431CDT) and specifies 100ppm/°C temperature coefficient (vs. 90ppm/°C). TL1431IDT is available in higher quantities (26,198 units) and Cut Tape & Digi-Reel packaging.

Q: Can I use LM431CIMX as a substitute if tolerance is critical? A: LM431CIMX provides ±0.5% tolerance, which is slightly wider than the original ±0.4%. For applications where ±0.4% tolerance is mandatory, use TL1431CDT, TL1431IDT, or TL1431IYDT instead. LM431CIMX is suitable where ±0.5% tolerance is acceptable.

Q: Is NCV431AIDR2G suitable for automotive applications? A: Yes. NCV431AIDR2G carries AEC-Q100 automotive qualification and operates -40°C ~ 125°C. However, it specifies ±1% tolerance versus the original ±0.4%. Use this part only if automotive qualification is required and tolerance relaxation is acceptable.

Q: Why should I avoid obsolete parts like TL1431CD and LM431CCMX? A: Obsolete parts present supply chain risk and may become unavailable. Active status substitutes (TL1431CDT, TL1431IDT, TL1431IYDT, LM431CIMX, NCV431AIDR2G) ensure long-term availability and production continuity. Use obsolete parts only when existing inventory must be consumed.

Q: What packaging options are available for substitutes? A: All substitutes use 8-SOIC (0.154", 3.90mm width) surface mount packaging, maintaining mechanical compatibility. Packaging variants include Tape & Reel (TL1431CDT), Cut Tape & Digi-Reel (TL1431IDT, TL1431IYDT, NCV431AIDR2G), and Bulk (LM431AIMX). Select based on procurement and assembly requirements.

Q: Can I use KA431DTF or LM431AIMX for precision voltage reference applications? A: These parts specify ±2% tolerance, which is significantly wider than the original ±0.4%. Use them only for applications where tolerance relaxation is acceptable. For precision applications, maintain ±0.4% tolerance using TL1431CDT, TL1431IDT, or TL1431IYDT.

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