TL431MSDT,215 Equivalent & Substitute Parts

Part Overview

The TL431MSDT,215 is a shunt voltage reference IC with adjustable output, manufactured by NXP USA Inc. in SOT-23 (TO-236AB) surface mount packaging. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design support and procurement continuity. The TL431 base product family offers multiple manufacturers and packaging variants that maintain functional compatibility within defined electrical parameter ranges.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36 V
Current - Output	100 mA
Tolerance	±2%
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TL431MSDT,215 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Reference Type: Shunt (all substitutes must be shunt references)
Output Type: Adjustable (all substitutes must support adjustable output)
Package / Case: TO-236-3, SC-59, SOT-23-3 (identical physical footprint required)
Voltage - Output Range: 2.495V minimum to 36V maximum (output range must encompass or match the original specification)
Current - Output: 100 mA (rated output current capacity)
Operating Temperature: -40°C ~ 125°C (temperature range must meet or exceed the original)
Mounting Type: Surface Mount (PCB assembly compatibility)

Allowable Variation Parameters:

Tolerance: ±2% to ±0.5% (tighter tolerance is acceptable; looser tolerance is not)
Current - Cathode: 1 mA to 80 µA (lower cathode current is acceptable)
Temperature Coefficient: Specified values acceptable where provided
Moisture Sensitivity Level: MSL 1 or MSL 3 acceptable (both meet reliability requirements)
Manufacturer: Multiple qualified manufacturers (NXP, Texas Instruments, Diodes Incorporated)
Packaging Format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, or Bulk acceptable

Substitutes are grouped by tolerance class and cathode current characteristics, as these parameters define performance boundaries within the same functional family.

Parameter Comparison

Part Number	Manufacturer	Status	Tolerance	Voltage Output (Min/Max)	Current Output	Cathode Current	Temp Coeff	Operating Temp	Package
TL431MSDT,215	NXP USA Inc.	Obsolete	±2%	2.495V / 36V	100 mA	1 mA	—	-40°C ~ 125°C	SOT-23
TL431MFDT,215	NXP Semiconductors	Active	±2%	2.495V / 36V	100 mA	1 mA	—	-40°C ~ 125°C	SOT-23
TL431QDBZR	Texas Instruments	Active	±2.2%	2.495V / 36V	100 mA	1 mA	—	-40°C ~ 125°C	SOT-23-3
TL431QDBZT	Texas Instruments	Active	±2.2%	2.495V / 36V	100 mA	1 mA	—	-40°C ~ 125°C	SOT-23-3
AS431ANTR-E1	Diodes Incorporated	Active	±0.5%	2.5V / 36V	100 mA	1 mA	20ppm/°C	-40°C ~ 125°C	SOT-23-3
AS431ANTR-G1	Diodes Incorporated	Active	±0.5%	2.5V / 36V	100 mA	1 mA	20ppm/°C	-40°C ~ 125°C	SOT-23-3
AS431BNTR-G1	Diodes Incorporated	Active	±1%	2.5V / 36V	100 mA	1 mA	20ppm/°C	-40°C ~ 125°C	SOT-23-3
AS431IANTR-G1	Diodes Incorporated	Active	±0.5%	2.5V / 36V	100 mA	50 µA	—	-40°C ~ 125°C	SOT-23-3
AS431IBNTR-G1	Diodes Incorporated	Active	±1%	2.5V / 36V	100 mA	50 µA	—	-40°C ~ 125°C	SOT-23-3
ATL432AIDBZR	Texas Instruments	Active	±1%	2.5V / 36V	100 mA	35 µA	48ppm/°C	-40°C ~ 85°C	SOT-23-3
ATL432BIDBZR	Texas Instruments	Active	±0.5%	2.5V / 36V	100 mA	80 µA	48ppm/°C	-40°C ~ 85°C	SOT-23-3

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

TL431MFDT,215 is the primary direct replacement. Manufactured by NXP Semiconductors with active product status, it maintains identical electrical specifications (±2% tolerance, 2.495V to 36V output range, 100 mA output current, 1 mA cathode current) and operating temperature range (-40°C to 125°C). The only difference is packaging format (Bulk vs. Tape & Reel), which does not affect circuit functionality. This part is recommended for designs requiring no electrical parameter changes.

Equivalent Substitutes (±2.2% Tolerance Class):

TL431QDBZR and TL431QDBZT, both from Texas Instruments, are functionally equivalent with ±2.2% tolerance specification. The tolerance variance of 0.2% from the original ±2% specification remains within acceptable engineering margins for most voltage reference applications. Both parts maintain identical output voltage range, current ratings, and operating temperature. TL431QDBZR is supplied in Cut Tape format; TL431QDBZT is supplied in Tape & Reel format. Selection between these depends on procurement and assembly requirements.

Higher-Precision Alternatives (±0.5% to ±1% Tolerance Class):

Diodes Incorporated AS431 series (AS431ANTR-E1, AS431ANTR-G1, AS431BNTR-G1) and AS431I series (AS431IANTR-G1, AS431IBNTR-G1) offer improved tolerance specifications (±0.5% or ±1%) with identical output voltage range and current ratings. These parts are suitable for applications requiring tighter voltage reference accuracy. The AS431I variants feature reduced cathode current (50 µA vs. 1 mA), which may reduce quiescent power consumption in battery-powered designs. Moisture Sensitivity Level is MSL 3 (168 Hours) for AS431 series, compared to MSL 1 for the original part; this requires appropriate handling during storage and assembly.

Temperature-Limited Alternative:

ATL432AIDBZR and ATL432BIDBZR from Texas Instruments operate within -40°C to 85°C temperature range, which is narrower than the original -40°C to 125°C specification. These parts are suitable only for applications where the upper operating temperature does not exceed 85°C. ATL432BIDBZR offers ±0.5% tolerance with reduced cathode current (80 µA), making it suitable for precision, lower-power applications within the restricted temperature range.

Compliance and Certification:

All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, matching the original part's environmental compliance profile. All parts are qualified to AEC-Q100 or equivalent automotive standards where applicable. Moisture Sensitivity Level varies between MSL 1 (unlimited) and MSL 3 (168 hours); procurement and assembly processes must accommodate the specified MSL rating.

Frequently Asked Questions (FAQ)

Q: Can TL431QDBZR replace TL431MSDT,215 directly on the PCB?

A: Yes. Both parts use identical SOT-23-3 package footprint (TO-236-3, SC-59). The ±2.2% tolerance specification of TL431QDBZR is marginally looser than the original ±2%, but remains functionally compatible for most voltage reference applications. No PCB layout changes are required.

Q: What is the difference between TL431QDBZR and TL431QDBZT?

A: Both parts are electrically identical (±2.2% tolerance, same voltage and current ratings). The difference is packaging format: TL431QDBZR is supplied in Cut Tape & Digi-Reel® format, while TL431QDBZT is supplied in Tape & Reel format. Selection depends on assembly equipment compatibility and procurement preferences.

Q: Why do some substitutes have lower cathode current (50 µA or 80 µA vs. 1 mA)?

A: Lower cathode current indicates reduced quiescent current draw through the reference IC. This is beneficial in low-power applications and does not affect circuit functionality. The reference output voltage and regulation characteristics remain unchanged. Designs using the original 1 mA cathode current specification will function correctly with lower-cathode-current substitutes.

Q: Are Diodes Incorporated AS431 parts compatible with the original NXP TL431MSDT,215?

A: Yes, AS431 parts are functionally compatible. They maintain the same SOT-23-3 package, adjustable output type, and 100 mA output current rating. The primary differences are improved tolerance (±0.5% or ±1% vs. ±2%), specified temperature coefficient (20ppm/°C), and MSL rating (MSL 3 vs. MSL 1). These differences represent performance improvements suitable for precision applications.

Q: Can ATL432AIDBZR be used in applications requiring operation above 85°C?

A: No. ATL432AIDBZR is specified for -40°C to 85°C operating temperature range. Applications requiring operation up to 125°C must use TL431MFDT,215, TL431QDBZR, TL431QDBZT, or AS431 series parts, all of which support the full -40°C to 125°C range.

Q: What does MSL 3 (168 Hours) mean for Diodes Incorporated AS431 parts?

A: MSL 3 indicates Moisture Sensitivity Level 3, requiring that the component be used within 168 hours of package opening. This requires controlled storage conditions and appropriate handling during assembly. MSL 1 (Unlimited) parts like the original TL431MSDT,215 have no time-to-use restrictions. Procurement and assembly processes must accommodate the specified MSL rating to prevent moisture-related failures.

Q: Which substitute offers the best tolerance specification?

A: AS431ANTR-E1, AS431ANTR-G1, AS431IANTR-G1, and ATL432BIDBZR all offer ±0.5% tolerance, the tightest specification in the substitute list. These parts are suitable for applications requiring high-precision voltage reference accuracy.

Q: Is the TL431MFDT,215 a true direct replacement?

A: Yes. TL431MFDT,215 is the direct replacement manufactured by NXP Semiconductors. It maintains identical electrical specifications (±2% tolerance, 2.495V to 36V output, 100 mA output current, 1 mA cathode current) and full operating temperature range (-40°C to 125°C). The only difference is packaging format (Bulk vs. Tape & Reel), which does not affect circuit performance.

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