TL431CDRG4 Equivalent & Substitute Parts

Part Overview

The TL431CDRG4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component provides a 2.495V adjustable output with ±2.2% tolerance and supports up to 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 production continuity. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

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
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TL431CDRG4 is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

Reference Type: Shunt (all substitutes must be shunt references)
Output Type: Adjustable (voltage regulation capability)
Voltage Output Range: Minimum 2.495V, Maximum ≥36V
Current Output: 100 mA capability
Current Cathode: 1 mA
Package: 8-SOIC form factor with 0.154" (3.90mm) width
Mounting: Surface mount compatibility

Tolerance Consideration: Substitutes with equal or tighter tolerance (±2.2% or better) maintain electrical equivalence. Parts with ±1% or ±0.5% tolerance provide improved accuracy for precision applications.

Temperature Range: The original part operates 0°C ~ 70°C. Substitutes with extended ranges (-40°C to 125°C) provide broader operational capability without electrical incompatibility.

Compliance & Status: Active product status ensures ongoing availability and manufacturing support. RoHS3 compliance is maintained across all recommended substitutes.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage Output (Min/Max)	Tolerance	Temp Range	Package	Inventory
TL431CDRG4	Texas Instruments	Obsolete	2.495V / 36V	±2.2%	0°C ~ 70°C	8-SOIC	3,900 Pcs
TL431CDR	Texas Instruments	Active	2.495V / 36V	±2.2%	0°C ~ 70°C	8-SOIC	105,300 Pcs
LM431BCM/NOPB	Texas Instruments	Active	2.495V / 37V	±1%	0°C ~ 70°C	8-SOIC	2,100 Pcs
LM431BCMX/NOPB	National Semiconductor	Active	2.495V / 37V	±1%	0°C ~ 70°C	8-SOIC	17,378 Pcs
KA431DTF	onsemi	Active	2.5V / 36V	±2%	-25°C ~ 85°C	8-SOIC	1,200 Pcs
TL431IDT	STMicroelectronics	Active	2.495V / 36V	±2.21%	-40°C ~ 105°C	8-SOIC	50,300 Pcs
TL431IYDT	STMicroelectronics	Active	2.495V / 36V	±2.21%	-40°C ~ 125°C	8-SOIC	100,200 Pcs
LM431AIMX	National Semiconductor	Active	2.5V / 36V	±2%	-40°C ~ 85°C	8-SOIC	3,965 Pcs
LM431BCMX	National Semiconductor	Active	2.495V / 36V	±1%	-25°C ~ 85°C	8-SOIC	26,067 Pcs
LM431CIMX	onsemi	Active	2.495V / 36V	±0.5%	-40°C ~ 85°C	8-SOIC	1,810 Pcs
NCV431AIDR2G	onsemi	Active	2.495V / 36V	±1%	-40°C ~ 125°C	8-SOIC	27,900 Pcs

Engineering Selection Recommendations

Direct Replacement (Electrical Equivalence): TL431CDR is the primary direct replacement, manufactured by Texas Instruments with identical electrical specifications and active product status. This part maintains the same tolerance, voltage range, and temperature operating window as the obsolete TL431CDRG4.

Enhanced Accuracy Alternatives: LM431BCM/NOPB, LM431BCMX/NOPB, LM431BCMX, and NCV431AIDR2G provide ±1% tolerance, improving voltage reference accuracy over the original ±2.2% specification. These parts maintain full electrical compatibility while offering tighter output voltage control.

Highest Precision Option: LM431CIMX delivers ±0.5% tolerance for applications requiring superior voltage regulation accuracy. This part is suitable for precision analog circuits where tighter reference voltage control is beneficial.

Extended Temperature Range: TL431IYDT and NCV431AIDR2G support -40°C to 125°C operation, providing broader environmental capability. TL431IYDT includes automotive-grade qualification (AEC-Q100) for automotive and industrial applications.

Compliance Considerations: All recommended substitutes maintain RoHS3 compliance. LM431AIMX is noted as RoHS non-compliant and REACH affected; use only where legacy compliance requirements apply.

Availability & Supply: TL431IYDT and TL431IDT offer the highest inventory levels (100,200 and 50,300 units respectively), ensuring supply continuity for high-volume production.

Frequently Asked Questions (FAQ)

Q: Can TL431CDR be used as a direct replacement for TL431CDRG4? A: Yes. TL431CDR is electrically and mechanically equivalent, with identical voltage output range (2.495V to 36V), tolerance (±2.2%), current rating (100 mA), and 8-SOIC package. The primary difference is active product status versus obsolete status.

Q: What is the difference between TL431 and LM431 series parts? A: Both are shunt voltage reference ICs with identical functional operation and 8-SOIC packaging. LM431 variants typically offer ±1% tolerance compared to TL431's ±2.2%, providing improved accuracy. All are electrically compatible for the same application circuits.

Q: Are there tolerance differences between substitutes? A: Yes. Substitutes range from ±2.2% (TL431CDR, TL431IDT, TL431IYDT) to ±1% (LM431 series, NCV431AIDR2G) to ±0.5% (LM431CIMX). Tighter tolerance parts provide better voltage regulation accuracy but are electrically compatible with designs using the original ±2.2% part.

Q: Can I use a substitute with a higher maximum voltage rating? A: Yes. LM431BCM/NOPB and LM431BCMX/NOPB support 37V maximum output versus the original 36V. This higher rating does not affect compatibility; the circuit will operate identically at the designed voltage level.

Q: What is the significance of automotive-grade qualification? A: TL431IYDT carries AEC-Q100 automotive qualification, indicating compliance with automotive reliability and environmental testing standards. This qualification is beneficial for automotive, industrial, and harsh-environment applications but is not required for standard commercial use.

Q: Does operating temperature range affect substitution compatibility? A: No. Extended temperature ranges (-40°C to 125°C) provide broader operational capability without affecting electrical compatibility. Designs operating within the original 0°C to 70°C range will function identically with substitutes rated for wider temperature ranges.

Q: Are all substitutes available in the same packaging? A: Yes. All listed substitutes use 8-SOIC (0.154", 3.90mm width) surface mount packaging, ensuring PCB layout and assembly compatibility without design modification.

Q: What is the difference between Cut Tape and Tube packaging? A: Cut Tape and Tube are supply formats that do not affect electrical or mechanical compatibility. Cut Tape is suitable for automated pick-and-place assembly; Tube packaging is used for manual handling or lower-volume applications. Both formats contain identical components.

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