TL431K-TP Equivalent & Substitute Parts

Part Overview

The TL431K-TP is a shunt voltage reference IC manufactured by Micro Commercial Co, designed for precision voltage regulation applications. This adjustable reference provides a fixed 2.5V output with ±0.5% tolerance across a 36V maximum operating range. The part is classified as obsolete, making equivalent and substitute components necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across core parameters including output voltage, tolerance, current ratings, and thermal characteristics.

Key Parameters

Parameter	Value	Unit
Reference Type	Shunt	—
Output Type	Adjustable	—
Voltage - Output (Min/Fixed)	2.5	V
Voltage - Output (Max)	36	V
Current - Output	100	mA
Tolerance	±0.5	%
Temperature Coefficient	50	ppm/°C
Current - Cathode	1	mA
Operating Temperature	-40 to 85	°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 TL431K-TP is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Reference type (Shunt)
Output voltage range (2.5V minimum, 36V maximum)
Output current capability (100 mA)
Tolerance specification (±0.5%)
Package form factor (SOT-23-3 / TO-236-3)
Surface mount compatibility

Acceptable Variation Parameters:

Temperature coefficient (48–50 ppm/°C range acceptable)
Cathode current (1–80 µA range acceptable)
Operating temperature range (minimum -40°C, maximum 85–125°C acceptable)
Output type (Adjustable or Programmable both acceptable for shunt reference function)

Substitute parts are grouped into two categories: direct manufacturer alternatives from Micro Commercial Co and parametric equivalents from Texas Instruments. All listed substitutes maintain electrical compatibility within the specified tolerance and current parameters.

Parameter Comparison

Parameter	TL431K-TP	TL431KA-TP	ATL431BIDBZR	ATL432BIDBZR
Manufacturer	Micro Commercial Co	Micro Commercial Co	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active
Reference Type	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Programmable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.5 V	2.495 V	2.5 V	2.5 V
Voltage - Output (Max)	36 V	36 V	36 V	36 V
Current - Output	100 mA	100 mA	100 mA	100 mA
Tolerance	±0.5%	±0.5%	±0.5%	±0.5%
Temperature Coefficient	50 ppm/°C	50 ppm/°C	48 ppm/°C	48 ppm/°C
Current - Cathode	1 mA	1 mA	35 µA	80 µA
Operating Temperature	-40 to 85°C	-40 to 125°C	-40 to 85°C	-40 to 85°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

TL431KA-TP (Micro Commercial Co): This part is the direct manufacturer successor to the TL431K-TP. It maintains identical electrical specifications with the exception of output type (programmable vs. adjustable) and extended operating temperature range (-40 to 125°C). Product status is active with confirmed inventory availability. This part is recommended as the primary replacement for obsolete TL431K-TP applications. RoHS3 compliance and REACH unaffected status are maintained.

ATL431BIDBZR (Texas Instruments): This parametric equivalent provides identical output voltage, current, and tolerance specifications. Temperature coefficient is marginally improved (48 ppm/°C vs. 50 ppm/°C). Cathode current is significantly reduced (35 µA vs. 1 mA), resulting in lower quiescent power consumption. Operating temperature range matches the original part (-40 to 85°C). Product status is active with high inventory availability. RoHS3 compliance and REACH unaffected status are maintained.

ATL432BIDBZR (Texas Instruments): This parametric equivalent maintains all critical electrical specifications identical to the TL431K-TP. Temperature coefficient is improved (48 ppm/°C). Cathode current is higher (80 µA vs. 1 mA) but remains within acceptable operating parameters. Operating temperature range matches the original part (-40 to 85°C). Product status is active with high inventory availability. RoHS3 compliance is maintained; HTSUS code differs slightly (8542.39.0060 vs. 8542.39.0001).

All substitute parts are surface mount compatible in SOT-23-3 package form factor and maintain full regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can TL431KA-TP be used as a direct replacement for TL431K-TP?

A: Yes. TL431KA-TP is the active product successor from the same manufacturer. It maintains identical voltage output (2.5V), current rating (100 mA), tolerance (±0.5%), and package form factor (SOT-23-3). The extended operating temperature range (-40 to 125°C vs. -40 to 85°C) provides additional thermal margin. Output type differs (programmable vs. adjustable), but both function as shunt voltage references with compatible electrical behavior in standard applications.

Q: What is the difference between ATL431BIDBZR and ATL432BIDBZR?

A: Both parts are Texas Instruments parametric equivalents with identical output voltage, current, tolerance, and package specifications. The primary difference is cathode current: ATL431BIDBZR operates at 35 µA while ATL432BIDBZR operates at 80 µA. This affects quiescent power consumption in the reference circuit. Both maintain ±0.5% tolerance and 48 ppm/°C temperature coefficient. Selection depends on circuit power budget requirements.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use the SOT-23-3 package form factor, also designated as TO-236-3 or SC-59. This ensures mechanical and electrical compatibility with existing PCB layouts designed for TL431K-TP.

Q: Do substitute parts maintain RoHS3 compliance?

A: Yes. All substitute parts listed (TL431KA-TP, ATL431BIDBZR, ATL432BIDBZR) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original TL431K-TP.

Q: What is the significance of the temperature coefficient difference?

A: Temperature coefficient measures output voltage drift per degree Celsius. TL431K-TP and TL431KA-TP specify 50 ppm/°C, while ATL431BIDBZR and ATL432BIDBZR specify 48 ppm/°C. This 2 ppm/°C difference is negligible in most applications and represents improved stability in the Texas Instruments alternatives. For precision applications requiring temperature compensation, this marginal improvement may be beneficial.

Q: Can these parts be used interchangeably in production?

A: Electrical interchangeability is confirmed for all listed substitutes within the specified parameter ranges. However, design validation should confirm compatibility with specific circuit topology, particularly regarding output type (adjustable vs. programmable) and cathode current requirements. Mechanical compatibility is assured through identical SOT-23-3 packaging.

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