CEFB105-G Equivalent & Substitute Parts Reference

Part Overview

The CEFB105-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 600 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement.

The diode features fast recovery characteristics with a reverse recovery time of 50 ns and forward voltage of 1.25 V at 1 A. Surface mount packaging enables integration into modern PCB assembly processes. Due to its obsolete status, equivalent parts from active manufacturers must be evaluated for direct substitution or design adaptation.

Substiute Parts

CEFB105-G

Comchip TechnologyIn Stock: 975CEFB105-G Datasheet

Current PartRFQ

MURS160-13-F

Diodes IncorporatedIn Stock: 99891MURS160-13-F Datasheet

DirectRFQ

MURS160

Good-Ark SemiconductorIn Stock: 95357MURS160 Datasheet

MFR RecommendedRFQ

RS1JB-13-F

Diodes IncorporatedIn Stock: 15427RS1JB-13-F Datasheet

MFR RecommendedRFQ

STTH1L06U

STMicroelectronicsIn Stock: 6645STTH1L06U Datasheet

MFR RecommendedRFQ

STTH1R06U

STMicroelectronicsIn Stock: 81581STTH1R06U Datasheet

MFR RecommendedRFQ

STTH2L06U

STMicroelectronicsIn Stock: 35392STTH2L06U Datasheet

MFR RecommendedRFQ

STTH2R06U

STMicroelectronicsIn Stock: 20004STTH2R06U Datasheet

MFR RecommendedRFQ

STTH3L06U

STMicroelectronicsIn Stock: 18378STTH3L06U Datasheet

MFR RecommendedRFQ

STTH3R06U

STMicroelectronicsIn Stock: 10135STTH3R06U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CEFB105-G is determined by the following critical parameters:

Primary Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 600 V minimum
• Current - Average Rectified (Io): 1 A minimum
• Package / Case: DO-214AA or SMB equivalent
• Mounting Type: Surface Mount
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

• Voltage - Forward (Vf) (Max): Must not exceed application requirements
• Reverse Recovery Time (trr): Lower values indicate improved performance
• Current - Reverse Leakage @ Vr: Lower values indicate improved performance
• Operating Temperature Range: Must accommodate application thermal environment
• RoHS and REACH Compliance: Required for modern supply chain integration

Substitute parts are grouped into two categories:

Category 1: Direct 1 A Equivalents Parts rated for 600 V and 1 A with identical or superior electrical characteristics and active product status. These parts provide pin-compatible and functionally equivalent replacement.

Category 2: Higher Current Rated Parts (2 A, 3 A) Parts rated for 600 V with current ratings exceeding 1 A. These parts are electrically compatible and provide design margin for current capacity. They occupy the same DO-214AA SMB package footprint.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (1 A Rated Parts):

MURS160-13-F (Diodes Incorporated) provides the closest electrical match to CEFB105-G with identical voltage, current, forward voltage, and reverse recovery time specifications. This part is active, ROHS3 compliant, and available in high volume (99,796 pcs in stock). It is the primary recommendation for direct substitution in existing designs.

STTH1L06U (STMicroelectronics) offers equivalent 1 A rating with improved reverse leakage current (1 µA vs. 5 µA) and active product status with ROHS3 compliance. Forward voltage is slightly elevated at 1.3 V. This part is suitable for applications where lower leakage current provides design benefit.

STTH1R06U (STMicroelectronics) provides 1 A rating with superior reverse recovery time (45 ns vs. 50 ns) but elevated forward voltage (1.7 V @ 1 A). This part is appropriate for high-frequency switching applications where recovery speed is critical.

RS1JB-13-F (Diodes Incorporated) is rated for 1 A at 600 V with active status and ROHS3 compliance. However, reverse recovery time of 250 ns exceeds the original specification and indicates slower switching characteristics. This part is suitable only for low-frequency rectification applications.

For Higher Current Applications (2 A and 3 A Rated Parts):

MURS160 (Good-Ark Semiconductor) provides 2 A rating at 600 V with active status and ROHS3 compliance. This part accommodates applications requiring current margin above 1 A while maintaining the same package footprint.

STTH2L06U and STTH2R06U (STMicroelectronics) are rated for 2 A at 600 V with active status and ROHS3 compliance. STTH2L06U offers lower forward voltage (1.3 V @ 2A), while STTH2R06U provides faster recovery (50 ns) with higher forward voltage (1.7 V @ 2A).

STTH3L06U and STTH3R06U (STMicroelectronics) are rated for 3 A at 600 V with active status and ROHS3 compliance. These parts provide maximum current capacity within the DO-214AA SMB package. STTH3R06U offers the fastest reverse recovery time (35 ns) among all listed substitutes.

Compliance Considerations:

All recommended substitute parts are ROHS3 compliant and REACH unaffected, meeting modern supply chain requirements. The CEFB105-G lacks documented RoHS status; substitution with compliant parts ensures regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can MURS160-13-F directly replace CEFB105-G without circuit modification?

A: Yes. MURS160-13-F matches all critical electrical parameters: 600 V reverse voltage, 1 A average rectified current, 1.25 V forward voltage at 1 A, and 50 ns reverse recovery time. Both parts use DO-214AA SMB packaging. No circuit modification is required.

Q: What is the difference between STTH1L06U and STTH1R06U?

A: Both are rated for 600 V and 1 A. STTH1L06U has lower forward voltage (1.3 V @ 1A) and slower recovery (80 ns). STTH1R06U has higher forward voltage (1.7 V @ 1A) and faster recovery (45 ns). Selection depends on whether the application prioritizes lower conduction loss or faster switching.

Q: Can I use a 2 A or 3 A rated diode in place of the 1 A CEFB105-G?

A: Yes. Higher current-rated diodes (MURS160, STTH2L06U, STTH2R06U, STTH3L06U, STTH3R06U) are electrically compatible and occupy the same DO-214AA SMB package. They provide design margin for current capacity and are suitable for applications where the circuit can tolerate the specified forward voltage and recovery characteristics of the selected part.

Q: Why does RS1JB-13-F have a much longer reverse recovery time (250 ns)?

A: RS1JB-13-F uses different internal design optimization. The extended recovery time indicates slower switching behavior, making this part unsuitable for high-frequency applications but acceptable for low-frequency rectification where switching speed is not critical.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original CEFB105-G does not document RoHS status. Substitution with compliant parts ensures alignment with current environmental and supply chain regulations.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current (Ir) represents unwanted current flow in the reverse-biased state. Lower values indicate better diode quality and reduced power dissipation in standby conditions. STTH series parts (1 µA @ 600V for 1 A ratings) offer superior leakage performance compared to CEFB105-G and MURS160-13-F (5 µA @ 600V).

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet the circuit's voltage, current, and switching speed requirements. However, using identical parts throughout a design simplifies procurement, inventory management, and troubleshooting.

Q: What packaging options are available for these substitutes?

A: All substitute parts are available in DO-214AA (SMB) surface mount package, matching the original CEFB105-G footprint. Packaging formats include Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) options depending on the specific part number and manufacturer.