SC431CSK-.5TRT Equivalent & Substitute Parts

Part Overview

The SC431CSK-.5TRT is a shunt voltage reference IC manufactured by Semtech Corporation, designed for adjustable voltage regulation applications. This Surface Mount device operates across -40°C to 85°C and delivers 130 µA output current with ±0.5% tolerance. The part is classified as Obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with SOT-23-3 packaging and preserve the adjustable shunt reference functionality across the specified operating temperature range.

Substiute Parts

SC431CSK-.5TRT

Semtech CorporationIn Stock: 17593SC431CSK-.5TRT Datasheet

Current PartRFQ

LM431CIM3/NOPB

Texas InstrumentsIn Stock: 16231LM431CIM3/NOPB Datasheet

MFR RecommendedRFQ

TL432BIDBZR

Texas InstrumentsIn Stock: 50424TL432BIDBZR Datasheet

MFR RecommendedRFQ

ZTL432BFTA

Diodes IncorporatedIn Stock: 38248ZTL432BFTA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Reference Type: Shunt (all candidates match)
• Output Type: Adjustable (all candidates match)
• Package / Case: SOT-23-3 (all candidates match)
• Mounting Type: Surface Mount (all candidates match)
• Operating Temperature Range: -40°C minimum and 85°C maximum (all candidates meet or exceed)
• Voltage - Output (Min/Fixed): 2.495V or 2.5V (functionally equivalent for adjustable references)
• Tolerance: ±0.5% or better (all candidates meet or exceed)

All three substitute parts satisfy these core substitution criteria. Differences in maximum output voltage, output current, and cathode current represent design variations that do not preclude substitution when circuit design accommodates the specified ranges.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are Active products with current manufacturing support, addressing the Obsolete status of the SC431CSK-.5TRT. Selection should be based on circuit-specific requirements:

LM431CIM3/NOPB (Texas Instruments): Highest maximum output voltage (37 V) and highest output current capability (100 mA). Tolerance specification is asymmetrical (-0.6%, +0.4%) compared to the original ±0.5%. Suitable for applications requiring extended voltage headroom.

TL432BIDBZR (Texas Instruments): Matches the original ±0.5% tolerance specification exactly. Maximum output voltage of 36 V and 100 mA output current. Cathode current of 700 µA provides mid-range performance. Recommended for direct functional replacement where tolerance symmetry is required.

ZTL432BFTA (Diodes Incorporated): Extended operating temperature range (-40°C to 125°C) provides thermal margin beyond the original specification. Maximum output voltage limited to 20 V; verify circuit compatibility. Lowest cathode current (600 µA) reduces power dissipation in low-current applications.

All substitute parts maintain RoHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitutes interchangeably with the SC431CSK-.5TRT?

A: All three substitutes are functionally compatible based on core parameters: shunt reference type, adjustable output, SOT-23-3 packaging, and operating temperature range. However, verify that your circuit design accommodates the specific maximum output voltage and output current of your chosen substitute.

Q: What is the key difference between LM431CIM3/NOPB and TL432BIDBZR?

A: Both are Texas Instruments products with 100 mA output current. TL432BIDBZR maintains the original ±0.5% tolerance specification, while LM431CIM3/NOPB uses asymmetrical tolerance (-0.6%, +0.4%). LM431CIM3/NOPB offers higher maximum output voltage (37 V vs. 36 V).

Q: Why does ZTL432BFTA have a lower maximum output voltage (20 V)?

A: ZTL432BFTA is a valid substitute for applications operating within its 20 V maximum specification. The lower voltage rating does not affect substitution eligibility; it reflects the device's design specifications. Confirm your circuit operates within this limit before selection.

Q: Is the extended temperature range of ZTL432BFTA (-40°C to 125°C) a requirement?

A: No. The original SC431CSK-.5TRT operates -40°C to 85°C. ZTL432BFTA's extended range to 125°C is an additional capability that provides thermal margin but is not required for substitution. Use it only if your application benefits from the extended range.

Q: What does "Cathode Current" mean in the context of these shunt references?

A: Cathode current is the maximum current the device can sink at the cathode terminal. SC431CSK-.5TRT specifies 150 mA, while substitutes range from 600 µA to 1 mA. Verify your circuit design does not exceed the cathode current rating of your chosen substitute.

Q: Are all substitutes RoHS compliant?

A: Yes. SC431CSK-.5TRT is RoHS Compliant. All three substitutes are ROHS3 Compliant, meeting current regulatory requirements.

Q: Can I use these substitutes in new production designs?

A: Yes. All three substitutes have Active product status with current manufacturing support, making them suitable for new designs. The original SC431CSK-.5TRT is Obsolete and should not be used in new production.