SC431CSKQTRT Equivalent & Substitute Parts

Part Overview

The SC431CSKQTRT is a shunt voltage reference IC manufactured by Semtech Corporation, designed for adjustable output voltage regulation in power management applications. This component features a fixed 2.495V minimum output with adjustable capability up to 30V, ±0.5% tolerance, and operates across -40°C to 125°C. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across core parameters including reference type, output type, tolerance, and package configuration.

Key Parameters

Parameter	SC431CSKQTRT
Manufacturer	Semtech Corporation
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	30V
Current - Output	130 µA
Tolerance	±0.5%
Current - Cathode	150 mA
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SC431CSKQTRT is determined by strict alignment across the following critical parameters:

Reference Type: Must be Shunt
Output Type: Must be Adjustable
Tolerance: Must be ±0.5%
Package / Case: Must be TO-236-3, SC-59, or SOT-23-3
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must support -40°C to 125°C minimum

All qualified substitutes maintain these core electrical and mechanical specifications. Variations in maximum output voltage, output current, cathode current, and temperature coefficient are permissible provided the substitute meets or exceeds the minimum requirements of the original part for the intended application circuit.

Parameter Comparison

Parameter	SC431CSKQTRT (Semtech)	TL432BQDBZR (Texas Instruments)	NCP431BISNT1G (onsemi)	ZTL432BFTA (Diodes Incorporated)
Reference Type	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.495V	2.495V	2.5V	2.5V
Voltage - Output (Max)	30V	36V	36V	20V
Current - Output	130 µA	100 mA	40 µA	100 mA
Tolerance	±0.5%	±0.5%	±0.5%	±0.5%
Current - Cathode	150 mA	700 µA	100 mA	600 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three substitute parts—TL432BQDBZR, NCP431BISNT1G, and ZTL432BFTA—meet the core substitution criteria for the obsolete SC431CSKQTRT. Selection should be based on product status and compliance requirements:

TL432BQDBZR (Texas Instruments) and ZTL432BFTA (Diodes Incorporated) are both active products with ROHS3 compliance and unlimited MSL rating. TL432BQDBZR provides the highest maximum output voltage (36V) and highest cathode current capability (700 µA), suitable for applications requiring extended voltage range. ZTL432BFTA maintains the full -40°C to 125°C operating range with 100 mA output current capacity.

NCP431BISNT1G (onsemi) is an active product with ROHS3 compliance and manufacturer-recommended status. This part features the lowest output current (40 µA) and operates to -40°C to 85°C, which is narrower than the original part's temperature range. Selection of NCP431BISNT1G requires verification that the application does not require operation above 85°C.

Frequently Asked Questions (FAQ)

Q: Can TL432BQDBZR directly replace SC431CSKQTRT in existing designs?

A: Yes. TL432BQDBZR maintains identical reference type (Shunt), output type (Adjustable), tolerance (±0.5%), and package (SOT-23-3). The higher maximum output voltage (36V vs. 30V) and cathode current (700 µA vs. 150 mA) provide enhanced capability. Operating temperature range is identical (-40°C to 125°C).

Q: What is the key difference between NCP431BISNT1G and the other substitutes?

A: NCP431BISNT1G has a narrower operating temperature range (-40°C to 85°C versus -40°C to 125°C for alternatives) and lower output current (40 µA). Applications requiring operation above 85°C must use TL432BQDBZR or ZTL432BFTA.

Q: Are all substitutes available in the same package?

A: Yes. All substitutes use TO-236-3 / SC-59 / SOT-23-3 surface mount packaging, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: What compliance certifications apply to these substitutes?

A: All substitutes carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. TL432BQDBZR and NCP431BISNT1G include REACH Unaffected status where specified. All parts are classified as EAR99 for export control purposes.

Q: Does ZTL432BFTA have any voltage limitations compared to the original part?

A: ZTL432BFTA has a maximum output voltage of 20V, which is lower than the SC431CSKQTRT (30V) and other substitutes (36V). Applications requiring output voltages between 20V and 30V must use TL432BQDBZR or verify circuit compatibility with the 20V maximum.

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