TL431CDBZRG4 Equivalent & Substitute Parts

Part Overview

The TL431CDBZRG4 is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments in SOT-23-3 surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The TL431 series provides adjustable reference voltage from 2.495V to 36V with 100mA output capability, suitable for power management and precision voltage regulation applications.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100mA
Tolerance	±2.2%
Current - Cathode	1mA
Operating Temperature	0°C ~ 70°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL431CDBZRG4 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt (all substitutes must maintain shunt topology)
Output Type: Adjustable (functional equivalence)
Voltage Range: Minimum 2.495V output, maximum 36V
Current Output: 100mA capability
Current - Cathode: 1mA minimum
Tolerance: ±2.2% or better (tighter tolerance acceptable)

Physical Compatibility Requirements:

Package / Case: TO-236-3, SC-59, SOT-23-3 (pin-compatible packages)
Mounting Type: Surface Mount

Compliance Requirements:

RoHS3 Compliant
MSL Rating: 1 (Unlimited) or equivalent

Substitutes are grouped into three categories: direct manufacturer equivalents (same electrical specifications, different packaging or manufacturer), and upgraded variants (enhanced temperature range, tighter tolerance, or automotive qualification).

Parameter Comparison

Part Number	Manufacturer	Tolerance	Output Min	Output Max	Current Output	Temp Range	Package	Status
TL431CDBZRG4	Texas Instruments	±2.2%	2.495V	36V	100mA	0°C ~ 70°C	SOT-23-3	Discontinued
TL431CDBZR	Texas Instruments	±2.2%	2.495V	36V	100mA	0°C ~ 70°C	SOT-23-3	Active
TL431CDBZR,215	Nexperia USA Inc.	±2%	2.495V	36V	100mA	0°C ~ 70°C	TO-236AB	Active
TL431FDT,215	Nexperia USA Inc.	±2%	2.495V	36V	100mA	-40°C ~ 125°C	TO-236AB	Active
TL431IDBZR,215	Nexperia USA Inc.	±2%	2.495V	36V	100mA	-40°C ~ 85°C	TO-236AB	Active
TL431IL3T	STMicroelectronics	±2.21%	2.495V	36V	100mA	-40°C ~ 105°C	SOT-23-3	Active
TL431QDBZR,215	Nexperia USA Inc.	±2%	2.495V	36V	100mA	-40°C ~ 125°C	TO-236AB	Active
AN431AN-ATRE1	Diodes Incorporated	±0.5%	2.5V	36V	100mA	-40°C ~ 125°C	SOT-23-3	Active
AN431AN-ATRG1	Diodes Incorporated	±0.5%	2.5V	36V	100mA	-40°C ~ 125°C	SOT-23-3	Active
AN431BN-ATRE1	Diodes Incorporated	±1%	2.5V	36V	100mA	-40°C ~ 125°C	SOT-23-3	Active
AN431BN-ATRG1	Diodes Incorporated	±1%	2.5V	36V	100mA	-40°C ~ 125°C	SOT-23-3	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended First Choice): TL431CDBZR from Texas Instruments is the direct active equivalent with identical electrical specifications and operating temperature range. This part maintains full compatibility with the discontinued TL431CDBZRG4.

Extended Temperature Range Alternatives: TL431FDT,215, TL431QDBZR,215, and TL431IL3T provide expanded operating temperature ranges (-40°C to 125°C or -40°C to 105°C) while maintaining electrical compatibility. These are suitable for applications requiring broader temperature operation. TL431QDBZR,215 includes AEC-Q100 automotive qualification.

Enhanced Tolerance Alternatives: AN431AN-ATRE1 and AN431AN-ATRG1 from Diodes Incorporated offer tighter tolerance (±0.5%) with extended temperature range (-40°C to 125°C). AN431BN-ATRE1 and AN431BN-ATRG1 provide ±1% tolerance with the same temperature range. These are suitable for precision applications where tighter voltage regulation is required.

Packaging Considerations: All substitutes maintain TO-236-3/SC-59/SOT-23-3 pin compatibility. Nexperia parts specify TO-236AB package designation, which is functionally equivalent to SOT-23-3. All parts are RoHS3 compliant and MSL rated for standard surface mount assembly.

Frequently Asked Questions (FAQ)

Q: Can I use TL431CDBZR as a direct replacement for TL431CDBZRG4? A: Yes. TL431CDBZR is the active equivalent with identical electrical specifications (±2.2% tolerance, 2.495V to 36V output, 100mA current) and operating temperature range (0°C to 70°C). It is pin-compatible in the same SOT-23-3 package.

Q: What is the difference between TL431 variants from different manufacturers? A: All TL431 variants maintain the same shunt reference topology and output range (2.495V to 36V, 100mA). Differences exist in tolerance (±2% to ±2.2%), temperature range, and packaging designation. Nexperia and STMicroelectronics versions offer extended temperature ranges and tighter tolerances compared to the original Texas Instruments specification.

Q: Are Diodes Incorporated AN431 parts compatible with TL431CDBZRG4? A: AN431 parts are functionally compatible but with differences: output voltage minimum is 2.5V (versus 2.495V), tolerance is tighter (±0.5% to ±1%), and operating temperature range is extended (-40°C to 125°C). These differences make AN431 suitable as an upgrade for precision applications but require verification that the 2.5V minimum output meets circuit requirements.

Q: What does "TO-236AB" package mean compared to "SOT-23-3"? A: TO-236AB and SOT-23-3 are equivalent designations for the same three-pin surface mount package. Both refer to the same physical form factor and pin configuration. Parts specified with either designation are mechanically and electrically interchangeable.

Q: Can I use parts with ±2% tolerance instead of ±2.2%? A: Yes. Tighter tolerance (±2%) is a functional improvement over ±2.2%. Parts like TL431CDBZR,215 and TL431FDT,215 with ±2% tolerance will perform within the original specification window and provide better voltage regulation accuracy.

Q: Which substitute should I choose for automotive applications? A: TL431QDBZR,215 from Nexperia includes AEC-Q100 automotive qualification with extended temperature range (-40°C to 125°C) and ±2% tolerance. This part meets automotive reliability and testing standards.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitutes are RoHS3 compliant and suitable for applications requiring lead-free assembly and environmental compliance.

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