SC431CSK-1TRT Equivalent & Substitute Parts

Part Overview

The SC431CSK-1TRT is a shunt voltage reference IC manufactured by Semtech Corporation, designed for adjustable precision voltage reference applications. This component operates with an adjustable output range of 2.495V to 30V, delivering 130µA output current with ±1% tolerance in a SOT-23-3 surface mount package. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and production continuity. Substitute parts maintain the same functional category, electrical specifications, and mechanical compatibility while offering active product status from alternative manufacturers.

Key Parameters

Parameter	SC431CSK-1TRT
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	30V
Current - Output	130µA
Tolerance	±1%
Current - Cathode	150mA
Operating Temperature	-40°C ~ 85°C
Package / Case	SOT-23-3
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SC431CSK-1TRT are selected based on strict electrical and mechanical compatibility criteria. All substitutes maintain the following core requirements:

Reference Type: Shunt voltage reference
Output Type: Adjustable
Tolerance: ±1%
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
Operating Temperature Range: -40°C minimum to 85°C minimum upper limit
Output Voltage Range: Minimum 2.495V to 2.5V, Maximum 30V or greater
Output Current: Sufficient for application requirements
Cathode Current: Compatible with circuit design

The three substitute parts—LM431BIM3/NOPB, NCP431AISNT1G, and TL431AMFDT,215—meet these criteria while offering active product status and improved availability compared to the obsolete SC431CSK-1TRT.

Parameter Comparison

Parameter	SC431CSK-1TRT	LM431BIM3/NOPB	NCP431AISNT1G	TL431AMFDT,215
Manufacturer	Semtech	Texas Instruments	onsemi	NXP Semiconductors
Product Status	Obsolete	Active	Active	Active
Reference Type	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.495V	2.495V	2.5V	2.495V
Voltage - Output (Max)	30V	37V	36V	36V
Current - Output	130µA	100mA	40µA	100mA
Tolerance	±1%	±1%	±1%	±1%
Temperature Coefficient	Not specified	50ppm/°C Typical	50ppm/°C Typical	Not specified
Current - Cathode	150mA	1mA	100mA	600µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three substitute parts are suitable replacements for the SC431CSK-1TRT based on electrical and mechanical compatibility. Selection among substitutes depends on specific application requirements:

LM431BIM3/NOPB (Texas Instruments) offers the highest maximum output voltage (37V) and maximum output current (100mA), with ROHS3 compliance and active product status. This part is optimal for applications requiring higher current delivery or extended voltage range.

NCP431AISNT1G (onsemi) provides the lowest output current specification (40µA) with maximum output voltage of 36V and ROHS3 compliance. This part is suitable for low-current reference applications with active product status and extended availability.

TL431AMFDT,215 (NXP Semiconductors) delivers 100mA output current with maximum output voltage of 36V and the widest operating temperature range (-40°C to 125°C). This part is appropriate for applications requiring extended temperature performance.

All substitutes maintain ±1% tolerance, SOT-23-3 packaging, surface mount compatibility, and MSL rating 1 (Unlimited). Product status is active for all three alternatives, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LM431BIM3/NOPB directly replace SC431CSK-1TRT in existing designs?

A: Yes. Both parts share identical reference type (shunt), output type (adjustable), tolerance (±1%), minimum output voltage (2.495V), and SOT-23-3 packaging. The LM431BIM3/NOPB provides higher maximum output voltage (37V vs 30V) and output current (100mA vs 130µA), making it electrically compatible for direct substitution.

Q: What is the difference between NCP431AISNT1G and the other substitutes?

A: NCP431AISNT1G specifies the lowest output current (40µA) compared to LM431BIM3/NOPB and TL431AMFDT,215 (both 100mA). The minimum output voltage is 2.5V instead of 2.495V. Selection depends on whether the application requires lower output current specifications or can tolerate the slightly higher minimum voltage.

Q: Are all substitutes available in the same package?

A: Yes. All substitute parts use SOT-23-3 packaging (also designated TO-236-3 or SC-59), ensuring mechanical and pin compatibility with the original SC431CSK-1TRT.

Q: Which substitute offers the best temperature performance?

A: TL431AMFDT,215 provides the widest operating temperature range (-40°C to 125°C) compared to SC431CSK-1TRT and the other substitutes (-40°C to 85°C). This part is recommended for applications requiring extended high-temperature operation.

Q: Do all substitutes meet RoHS compliance requirements?

A: LM431BIM3/NOPB and NCP431AISNT1G are ROHS3 compliant. TL431AMFDT,215 compliance status is not specified in the provided data. Verify RoHS requirements with your specific application and regulatory standards.

Q: What is the significance of cathode current differences among substitutes?

A: Cathode current specifications (SC431CSK-1TRT: 150mA, LM431BIM3/NOPB: 1mA, NCP431AISNT1G: 100mA, TL431AMFDT,215: 600µA) indicate the maximum current the reference can sink. Circuit design must ensure cathode current does not exceed the specified limit for the selected substitute part.

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