TL431ACDRG4 Equivalent & Substitute Parts

Part Overview

The TL431ACDRG4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component provides a fixed minimum output of 2.495V with a maximum output of 36V, delivering up to 100mA output current with ±1% tolerance. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the core shunt reference functionality while offering improved availability and, in some cases, enhanced performance characteristics.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100mA
Tolerance	±1%
Current - Cathode	600µA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TL431ACDRG4 is determined by the following critical parameters: reference type (shunt), output type (adjustable), minimum output voltage (2.495V or compatible), maximum output voltage (36V or higher), output current capability (100mA), package type (8-SOIC), and mounting method (surface mount). Parts are grouped into three categories based on substitution suitability:

Direct Equivalents (Manufacturer Recommended): Parts with identical or superior electrical specifications and active product status. These include TL431ACDR (same manufacturer, active status), LM431BCM/NOPB and LM431BCMX/NOPB (±1% tolerance, active status), and LM431BCMX (active status).

Compatible Alternatives (Manufacturer Recommended): Parts with slightly relaxed tolerance specifications (±2% or ±2.2%) but maintaining core functionality. These include LM431ACM/NOPB and LM431ACMX/NOPB (±2.2% tolerance, active status).

Enhanced Performance Upgrade: TL1431AIDT (STMicroelectronics) offers extended operating temperature range (-40°C to 105°C) and active product status, suitable for applications requiring wider temperature operation.

Specialized Alternatives: LT1431CS8#PBF and LT1431CS8#TRPBF (Analog Devices) provide superior tolerance (±0.4%) and lower temperature coefficient (30ppm/°C) for precision applications. KA431DTF (onsemi) offers ±2% tolerance with extended temperature range (-25°C to 85°C).

Parameter Comparison

Part Number	Manufacturer	Status	Voltage Min/Fixed (V)	Voltage Max (V)	Current Output (mA)	Tolerance	Cathode Current (mA)	Temp Range (°C)	Package
TL431ACDRG4	Texas Instruments	Obsolete	2.495	36	100	±1%	0.6	0 ~ 70	8-SOIC
TL431ACDR	Texas Instruments	Active	2.495	36	100	±1%	0.6	0 ~ 70	8-SOIC
LM431BCM/NOPB	Texas Instruments	Active	2.495	37	100	±1%	1.0	0 ~ 70	8-SOIC
LM431BCMX/NOPB	National Semiconductor	Active	2.495	37	100	±1%	1.0	0 ~ 70	8-SOIC
LM431ACM/NOPB	National Semiconductor	Active	2.495	37	100	±2.2%	1.0	0 ~ 70	8-SOIC
LM431ACMX/NOPB	Texas Instruments	Active	2.495	37	100	±2.2%	1.0	0 ~ 70	8-SOIC
TL1431AIDT	STMicroelectronics	Active	2.495	36	100	±1%	0.7	-40 ~ 105	8-SOIC
KA431DTF	onsemi	Active	2.5	36	100	±2%	1.0	-25 ~ 85	8-SOIC
LM431BCMX	National Semiconductor	Active	2.495	36	100	±1%	1.0	-25 ~ 85	8-SOIC
LT1431CS8#PBF	Analog Devices Inc.	Active	2.5	36	100	±0.4%	1.0	0 ~ 70	8-SO
LT1431CS8#TRPBF	Analog Devices Inc.	Active	2.5	36	100	±0.4%	1.0	0 ~ 70	8-SO

Engineering Selection Recommendations

For Direct Replacement: TL431ACDR is the primary equivalent, offering identical electrical specifications and active product status from the original manufacturer. This part maintains the same ±1% tolerance, 600µA cathode current, and 0°C to 70°C operating range.

For Active Inventory with Relaxed Tolerance: LM431BCM/NOPB and LM431BCMX/NOPB provide ±1% tolerance matching the original specification with significantly higher inventory availability. The 1mA cathode current is higher than the original 600µA but remains within acceptable operating margins for most applications.

For Extended Temperature Operation: TL1431AIDT extends the operating range to -40°C to 105°C while maintaining ±1% tolerance and active product status. This upgrade is suitable for industrial and automotive applications requiring wider temperature performance.

For Precision Applications: LT1431CS8#PBF and LT1431CS8#TRPBF deliver superior ±0.4% tolerance and 30ppm/°C temperature coefficient, appropriate for high-accuracy voltage reference requirements. Both are ROHS3 compliant and actively produced.

For Cost-Optimized Designs: LM431ACM/NOPB and LM431ACMX/NOPB offer ±2.2% tolerance with active status. These parts are suitable for applications where tighter tolerance is not critical.

All recommended substitutes maintain 8-SOIC surface mount packaging, 100mA output current capability, and ROHS3 compliance. Selection should be based on specific tolerance requirements, operating temperature range, and inventory availability for your production timeline.

Frequently Asked Questions (FAQ)

Q: Can TL431ACDR directly replace TL431ACDRG4? A: Yes. TL431ACDR is the direct equivalent with identical electrical specifications (2.495V minimum, 36V maximum, 100mA output, ±1% tolerance) and the same 8-SOIC package. The primary difference is product status: TL431ACDR is active while TL431ACDRG4 is obsolete.

Q: What is the difference between TL431ACDR and LM431BCM/NOPB? A: Both maintain ±1% tolerance and 100mA output current. LM431BCM/NOPB has a slightly higher maximum output voltage (37V vs 36V) and higher cathode current (1mA vs 600µA). Both are surface mount 8-SOIC packages and actively produced.

Q: Are LM431 series parts compatible with TL431 designs? A: Yes, within the specified electrical parameters. Both series provide adjustable shunt voltage references in 8-SOIC packages with matching output voltage ranges and current capabilities. Verify cathode current requirements in your specific application, as LM431 parts typically draw 1mA versus 600µA for TL431ACDRG4.

Q: Can I use LT1431CS8#TRPBF as a substitute? A: Yes, with considerations. LT1431CS8#TRPBF offers superior ±0.4% tolerance and lower temperature coefficient (30ppm/°C). The 8-SO package is mechanically compatible with 8-SOIC footprints. Use this part when precision voltage reference performance is required.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Both are surface mount delivery formats for the same component. Cut Tape (CT) provides individual strips, while Tape & Reel (TR) supplies components on continuous reels for automated assembly. Electrical specifications remain identical; packaging choice depends on production volume and assembly equipment.

Q: Does KA431DTF work as a substitute? A: Yes. KA431DTF provides ±2% tolerance, 100mA output, and 8-SOIC package compatibility. It offers extended operating temperature (-25°C to 85°C) compared to the original 0°C to 70°C range. Use this part when wider temperature operation is beneficial and ±2% tolerance is acceptable.

Q: Are all substitute parts ROHS3 compliant? A: All recommended substitutes listed are ROHS3 compliant, matching the original TL431ACDRG4 environmental certification. Verify specific part certifications for your regulatory requirements.

Q: What should I consider when selecting between multiple substitutes? A: Prioritize based on: (1) tolerance requirement (±0.4% to ±2.2%), (2) operating temperature range needed, (3) cathode current specifications for your circuit design, (4) inventory availability, and (5) packaging format (Cut Tape vs Tape & Reel). All listed parts maintain the core 8-SOIC surface mount format and 100mA output current capability.

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