TL431QDBZRG4 Equivalent & Substitute Parts

Part Overview

The TL431QDBZRG4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable output voltage regulation in power management applications. This device provides a 2.495V adjustable output with ±2.2% tolerance, capable of delivering 100 mA output current across a 36V maximum input range in a compact SOT-23-3 surface mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

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	-40°C ~ 125°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL431QDBZRG4 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Reference Type: Shunt (all substitutes must be shunt-type references)
Output Type: Adjustable (maintains voltage regulation capability)
Package / Case: TO-236-3, SC-59, SOT-23-3 (ensures PCB footprint compatibility)
Mounting Type: Surface Mount (maintains assembly process compatibility)
Current - Output: 100 mA (minimum required current delivery)
Current - Cathode: 1 mA (cathode bias current requirement)
Voltage - Output (Max): ≥36V (must support maximum input voltage)
Voltage - Output (Min/Fixed): ≥2.495V (must support minimum output voltage)
Operating Temperature: -40°C ~ 125°C (must cover full operating range)
RoHS Status: ROHS3 Compliant (regulatory requirement)

Tolerance Consideration: Substitutes with tolerance ≤±2.2% are directly interchangeable. Parts with tighter tolerance (±0.4%, ±0.5%, ±1%, ±2%) provide improved accuracy and are functionally superior for the same application.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Range	Package	Status
TL431QDBZRG4	Texas Instruments	2.495V	36V	100 mA	±2.2%	-40°C ~ 125°C	SOT-23-3	Discontinued
TL431QDBZR	Texas Instruments	2.495V	36V	100 mA	±2.2%	-40°C ~ 125°C	SOT-23-3	Active
LM431AIM3/NOPB	Texas Instruments	2.495V	37V	100 mA	±2.2%	-40°C ~ 85°C	SOT-23-3	Active
LM431AIM3X/NOPB	Texas Instruments	2.495V	37V	100 mA	±2.2%	-40°C ~ 85°C	SOT-23-3	Active
TL431FDT,215	Nexperia USA Inc.	2.495V	36V	100 mA	±2%	-40°C ~ 125°C	SOT-23-3	Active
TL431QDBZR,215	Nexperia USA Inc.	2.495V	36V	100 mA	±2%	-40°C ~ 125°C	SOT-23-3	Active
AN431AN-ATRE1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	-40°C ~ 125°C	SOT-23-3	Active
AN431AN-ATRG1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	-40°C ~ 125°C	SOT-23-3	Active
AN431BN-ATRE1	Diodes Incorporated	2.5V	36V	100 mA	±1%	-40°C ~ 125°C	SOT-23-3	Active
AN431BN-ATRG1	Diodes Incorporated	2.5V	36V	100 mA	±1%	-40°C ~ 125°C	SOT-23-3	Active
AZ431AN-ATRE1	Diodes Incorporated	2.5V	36V	100 mA	±0.4%	-40°C ~ 125°C	SOT-23-3	Active

Engineering Selection Recommendations

Primary Recommendation: TL431QDBZR (Texas Instruments)

The TL431QDBZR is the direct active equivalent to the discontinued TL431QDBZRG4. Both parts share identical electrical specifications (2.495V output, 36V maximum, 100 mA, ±2.2% tolerance) and operating temperature range (-40°C ~ 125°C). This part maintains full compatibility with existing PCB designs and requires no circuit modifications. Product status is Active with 71,200 units in stock.

Secondary Recommendation: TL431FDT,215 (Nexperia USA Inc.)

The TL431FDT,215 provides equivalent functionality with improved tolerance (±2% versus ±2.2%), matching voltage specifications and current ratings. This part is AEC-Q100 qualified for automotive applications and maintains the full -40°C ~ 125°C operating range. Nexperia sourcing provides supply chain diversification. Product status is Active with 7,756 units in stock.

Higher Accuracy Alternatives: AN431 Series (Diodes Incorporated)

The AN431AN-ATRE1, AN431AN-ATRG1, AN431BN-ATRE1, and AN431BN-ATRG1 offer tighter tolerance specifications (±0.5% and ±1% respectively) while maintaining all critical electrical parameters. These parts support the full -40°C ~ 125°C operating range and are suitable for applications requiring improved voltage reference accuracy. All AN431 variants are Active with substantial inventory availability.

Premium Accuracy Option: AZ431AN-ATRE1 (Diodes Incorporated)

The AZ431AN-ATRE1 delivers the tightest tolerance (±0.4%) among available substitutes while maintaining full electrical and thermal compatibility. This part is recommended for precision voltage regulation applications where reference accuracy is critical. Product status is Active with 9,425,400 units in stock.

Frequently Asked Questions (FAQ)

Q: Can I use LM431AIM3/NOPB or LM431AIM3X/NOPB as direct replacements?

A: These parts are functionally compatible but have a reduced operating temperature maximum of -40°C ~ 85°C compared to the original -40°C ~ 125°C specification. Use only if your application does not require operation above 85°C. Both parts are Active status with good inventory availability.

Q: What is the difference between the Diodes Incorporated AN431 variants?

A: The AN431 series differs by tolerance specification: AN431AN variants provide ±0.5% tolerance, while AN431BN variants provide ±1% tolerance. Both maintain identical voltage output (2.5V minimum), current ratings (100 mA), and operating temperature range (-40°C ~ 125°C). Selection depends on accuracy requirements for your application.

Q: Are Nexperia TL431 parts (TL431FDT,215 and TL431QDBZR,215) compatible with Texas Instruments TL431 parts?

A: Yes. Both manufacturers' TL431 variants share identical electrical specifications and SOT-23-3 packaging. Nexperia parts offer AEC-Q100 automotive qualification and slightly improved tolerance (±2% versus ±2.2%). These are suitable for direct substitution.

Q: What does the output voltage difference (2.495V vs 2.5V) mean for substitution?

A: The 2.495V specification in the original part and 2.5V in Diodes Incorporated parts represent the minimum adjustable output voltage. Both values are within typical application tolerance windows. The 5mV difference is negligible for most power management circuits and does not prevent substitution.

Q: Which substitute offers the best supply chain availability?

A: The AZ431AN-ATRE1 (Diodes Incorporated) has the highest inventory at 9,425,400 units in stock, providing the most secure long-term supply. The TL431QDBZR (Texas Instruments) offers 71,200 units as the primary direct equivalent.

Q: Can I mix different substitute parts in the same production batch?

A: Yes, all listed substitutes are electrically and mechanically compatible. However, maintaining consistent sourcing from a single part number is recommended for production traceability and quality control documentation.

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