SK115B Schottky Diode 150V 1A Equivalent & Substitute Parts

Part Overview

The SK115B is an active-status Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 150V DC reverse voltage and 1A average rectified current in a surface mount DO-214AA (SMB) package. This component is designed for fast recovery applications with switching speeds ≤500ns and operates across a junction temperature range of -55°C to 150°C. The part is RoHS3 compliant with MSL 1 (unlimited moisture sensitivity level) and REACH unaffected status.

Equivalent and substitute parts are identified when designs require alternative sourcing, inventory availability, or when higher current ratings provide design margin within the same voltage class and package footprint.

Substiute Parts

SK115B

Taiwan Semiconductor CorporationIn Stock: 12167SK115B Datasheet

Current PartRFQ

CDBB1150-HF

Comchip TechnologyIn Stock: 1064CDBB1150-HF Datasheet

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CDBB2150-HF

Comchip TechnologyIn Stock: 1028CDBB2150-HF Datasheet

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CDBB3150-HF

Comchip TechnologyIn Stock: 6375CDBB3150-HF Datasheet

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SBR3150SB-13

Diodes IncorporatedIn Stock: 9741SBR3150SB-13 Datasheet

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STPS3150U

STMicroelectronicsIn Stock: 18048STPS3150U Datasheet

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STPS3150UY

STMicroelectronicsIn Stock: 42824STPS3150UY Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the SK115B is based on the following criteria:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) Maximum: 150V (exact match required)
• Technology: Schottky (exact match required)
• Package / Case: DO-214AA, SMB (exact match required)
• Mounting Type: Surface Mount (exact match required)
• RoHS Status: ROHS3 Compliant (compliance requirement)
• Moisture Sensitivity Level: MSL 1 (unlimited)

Secondary Substitution Criteria:

• Current - Average Rectified (Io): Equal to or greater than 1A
• Speed: Fast Recovery ≤500ns, >200mA (Io)
• Operating Temperature Range: Must accommodate application requirements

Substitute parts are grouped into two categories:

Category 1 - Direct Current Rating Equivalents (1A): CDBB1150-HF (Comchip Technology) matches the 1A current rating with identical voltage and package specifications.

Category 2 - Higher Current Rating Substitutes (2A and 3A): CDBB2150-HF (2A), CDBB3150-HF (3A), SBR3150SB-13 (3A), STPS3150U (3A), and STPS3150UY (3A) provide increased current capacity within the same 150V voltage class and DO-214AA package. These parts are suitable for applications where the 1A rating is marginal or where design margin is required.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent Selection: CDBB1150-HF is the direct equivalent to SK115B, matching the 1A current rating, 150V voltage specification, and DO-214AA package. Both parts are RoHS3 compliant with MSL 1 rating and REACH unaffected status. Selection of CDBB1150-HF is appropriate for one-to-one replacement in existing designs without circuit modification.

Higher Current Rating Substitutes: CDBB2150-HF (2A), CDBB3150-HF (3A), SBR3150SB-13 (3A), STPS3150U (3A), and STPS3150UY (3A) are suitable substitutes when increased current capacity is required or when design margin above the 1A specification is necessary. All substitute parts maintain the 150V voltage rating, DO-214AA package footprint, and RoHS3 compliance. These parts are pin-compatible and require no PCB layout modification.

Compliance Verification: All listed substitute parts maintain RoHS3 compliance, MSL 1 moisture sensitivity level, and REACH unaffected status, ensuring regulatory alignment with the original SK115B specification.

Temperature Range Consideration: The SK115B operates from -55°C to 150°C. CDBB1150-HF, CDBB2150-HF, and CDBB3150-HF extend the upper temperature limit to 175°C. STPS3150U and STPS3150UY provide maximum junction temperatures of 175°C and -40°C to 175°C respectively. SBR3150SB-13 specifies a maximum junction temperature of 150°C, matching the original part. Application temperature requirements determine whether extended temperature range substitutes are appropriate.

Frequently Asked Questions (FAQ)

Q: Can CDBB1150-HF be used as a direct replacement for SK115B? A: Yes. CDBB1150-HF is a direct equivalent with identical 150V voltage rating, 1A current rating, DO-214AA package, and RoHS3 compliance. No circuit modification is required.

Q: What is the advantage of using higher current-rated substitutes like CDBB3150-HF or STPS3150U? A: Higher current-rated parts (2A or 3A) provide design margin above the 1A specification and allow the same component to be used in applications with varying current requirements within the 150V class. All maintain the same package footprint and voltage rating.

Q: Are all substitute parts pin-compatible with SK115B? A: Yes. All listed substitute parts use the DO-214AA (SMB) package with identical pinout and footprint. No PCB layout changes are required for substitution.

Q: What is the difference between STPS3150U and STPS3150UY? A: Both parts are STMicroelectronics 150V 3A Schottky diodes with identical electrical specifications. STPS3150UY is designated as automotive grade with an operating temperature range of -40°C to 175°C, while STPS3150U specifies a maximum junction temperature of 175°C. STPS3150UY is suitable for automotive applications requiring extended low-temperature operation.

Q: Do all substitute parts meet RoHS3 and REACH compliance? A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of SK115B.

Q: What is the significance of reverse leakage current differences among substitutes? A: Reverse leakage current is specified at the rated voltage. SK115B specifies 100 µA at 150V, while Comchip parts specify 500 µA and STMicroelectronics parts specify 2 µA at 150V. Lower reverse leakage reduces standby power dissipation in applications with sustained reverse bias. Higher leakage has minimal impact in typical rectification circuits but may be significant in precision analog applications.

Q: Can SK115B be substituted with a higher voltage-rated part? A: Substitution with higher voltage ratings (e.g., 200V or 300V) is not addressed in this reference. Such substitutions require separate electrical and thermal analysis and are outside the scope of equivalent parts within the 150V class.

Q: What packaging options are available for these substitute parts? A: All listed parts are supplied in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® formats suitable for automated assembly. The DO-214AA (SMB) package is standard across all parts.