S3M Equivalent & Substitute Parts Reference

Part Overview

The S3M is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. Manufactured by Micro Commercial Co, this component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical specifications while offering improved availability, compliance certifications, and packaging options.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	V
Current - Reverse Leakage @ Vr	10	µA @ 1000 V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitute parts are grouped into three categories based on electrical and mechanical compatibility with the S3M:

Direct Equivalents (Identical Electrical & Package Specifications): Parts that maintain all core electrical parameters (1000 V, 3 A, standard recovery speed) and use the same DO-214AB SMC package. These parts differ only in packaging format (Tape & Reel vs. Cut Tape) or manufacturer source. Direct equivalents include S3M-TP, S3M-E3/57T, and S3M-E3/9AT.

Similar Substitutes (Matching Core Ratings, Potential Parameter Variations): Parts that meet the 1000 V and 3 A requirements but may exhibit differences in forward voltage, reverse leakage current, or recovery speed characteristics. These include CMR3-10 variants, CFRC307-G, and CURC307-G. All maintain DO-214AB SMC package compatibility.

Upgrade Substitutes (Enhanced Performance, Different Package): The RS3MB-13-F offers improved specifications (faster recovery time, lower reverse leakage) but uses a DO-214AA SMB package instead of DO-214AB SMC. This represents a package change requiring PCB layout modification.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr): Must equal or exceed 1000 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Mounting Type: Surface Mount (required)
Package / Case: DO-214AB SMC (primary), DO-214AA SMB (upgrade only)
Operating Temperature Range: Must encompass application requirements

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Speed	Trr [ns]	Ir @ Vr [µA]	Package	Product Status	RoHS Status
S3M	Micro Commercial Co	1000	3	1.2 @ 3A	Standard >500ns	—	10 @ 1000V	DO-214AB SMC	Obsolete	Non-compliant
S3M-TP	Micro Commercial Co	1000	3	1.2 @ 3A	Standard >500ns	—	10 @ 1000V	DO-214AB SMC	Active	ROHS3 Compliant
S3M-E3/57T	Vishay General Semiconductor	1000	3	1.15 @ 2.5A	Standard >500ns	2.5	10 @ 1000V	DO-214AB SMC	Active	ROHS3 Compliant
S3M-E3/9AT	Vishay General Semiconductor	1000	3	1.15 @ 2.5A	Standard >500ns	2.5	10 @ 1000V	DO-214AB SMC	Active	ROHS3 Compliant
CMR3-10 BK PBFREE	Central Semiconductor Corp	1000	3	1.2 @ 3A	Standard >500ns	—	5 @ 1000V	DO-214AB SMC	Active	ROHS3 Compliant
CMR3-10 TR13 PBFREE	Central Semiconductor Corp	1000	3	1.2 @ 3A	Standard >500ns	—	5 @ 1000V	DO-214AB SMC	Active	ROHS3 Compliant
CFRC307-G	Comchip Technology	1000	3	1.3 @ 3A	Fast ≤500ns	500	5 @ 1000V	DO-214AB SMC	Active	ROHS3 Compliant
CMR3U-10 BK PBFREE	Central Semiconductor Corp	1000	3	1.7 @ 3A	Fast ≤500ns	100	5 @ 1000V	DO-214AB SMC	Active	ROHS3 Compliant
CMR3U-10 TR13 PBFREE	Central Semiconductor Corp	1000	3	1.7 @ 3A	Fast ≤500ns	100	5 @ 1000V	DO-214AB SMC	Active	ROHS3 Compliant
CURC307-G	Comchip Technology	1000	3	1.7 @ 3A	Fast ≤500ns	75	5 @ 1000V	DO-214AB SMC	Active	ROHS3 Compliant
RS3MB-13-F	Diodes Incorporated	1000	3	1.3 @ 3A	Fast ≤500ns	500	5 @ 1000V	DO-214AA SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification Required):

S3M-TP is the primary direct equivalent, offering identical electrical specifications and DO-214AB SMC package compatibility. This part is manufactured by Micro Commercial Co (original manufacturer) and carries ROHS3 compliance certification. Inventory availability is substantial at 321,300 pieces.

S3M-E3/57T and S3M-E3/9AT (Vishay General Semiconductor) provide direct package and voltage/current compatibility with marginally improved forward voltage characteristics (1.15 V @ 2.5 A vs. 1.2 V @ 3 A). Both are ROHS3 compliant and actively produced.

CMR3-10 variants (Central Semiconductor Corp, both bulk and tape & reel packaging) maintain identical forward voltage and package specifications while offering improved reverse leakage performance (5 µA vs. 10 µA). ROHS3 compliant with active product status.

For Applications Tolerant of Parameter Variations:

CFRC307-G (Comchip Technology) and CURC307-G (Comchip Technology) offer faster recovery characteristics (500 ns and 75 ns respectively) compared to the S3M standard recovery specification. These parts are suitable for applications where reduced switching losses are beneficial. Both are ROHS3 compliant.

CMR3U-10 variants (Central Semiconductor Corp) provide ultrafast recovery (100 ns) with trade-off of higher forward voltage (1.7 V @ 3 A). Applicable to high-frequency switching applications.

For Package Upgrade Applications:

RS3MB-13-F (Diodes Incorporated) represents an upgrade path with improved specifications (faster recovery, lower leakage) but requires PCB layout modification due to DO-214AA SMB package substitution for DO-214AB SMC. This part is ROHS3 compliant and actively produced.

Compliance Considerations:

All substitute parts listed carry ROHS3 compliance certification, addressing the non-compliant status of the original S3M. Selection of any substitute part resolves RoHS compliance requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can S3M-TP be used as a direct replacement for S3M without any circuit modifications?

A: Yes. S3M-TP maintains identical electrical specifications (1000 V, 3 A, 1.2 V forward voltage) and uses the same DO-214AB SMC package. The only difference is packaging format (Tape & Reel vs. bulk) and active product status with ROHS3 compliance.

Q: What is the difference between standard recovery and fast recovery diodes in this product category?

A: Standard recovery diodes (S3M, CMR3-10 variants) exhibit recovery times exceeding 500 nanoseconds. Fast recovery diodes (CFRC307-G, CMR3U-10, CURC307-G) achieve recovery times of 500 nanoseconds or less. Fast recovery reduces switching losses in high-frequency applications but may increase forward voltage drop.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. The original S3M is RoHS non-compliant. Selection of any substitute part satisfies RoHS compliance requirements.

Q: What is the significance of the DO-214AB SMC package versus DO-214AA SMB package?

A: DO-214AB (SMC) and DO-214AA (SMB) are distinct surface mount packages with different physical dimensions and PCB footprints. DO-214AB is smaller than DO-214AA. The RS3MB-13-F uses DO-214AA SMB and requires PCB layout modification. All other substitutes maintain DO-214AB SMC compatibility with the original S3M.

Q: Can I use CMR3U-10 or CURC307-G as direct replacements if my application operates at high switching frequencies?

A: CMR3U-10 and CURC307-G are suitable for high-frequency applications due to ultrafast recovery characteristics (100 ns and 75 ns respectively). However, both exhibit higher forward voltage (1.7 V @ 3 A) compared to S3M (1.2 V @ 3 A). Thermal dissipation and circuit performance must be evaluated for your specific application.

Q: What is the difference between CMR3-10 BK PBFREE and CMR3-10 TR13 PBFREE?

A: Both parts are electrically identical. The difference is packaging format: CMR3-10 BK PBFREE is supplied in bulk packaging, while CMR3-10 TR13 PBFREE is supplied in Tape & Reel format. Selection depends on assembly process requirements and inventory management preferences.

Q: Why does the S3M-E3/57T show forward voltage at 2.5 A instead of 3 A?

A: Forward voltage characteristics vary with current level. S3M-E3/57T specifies 1.15 V @ 2.5 A, which is lower than the S3M specification of 1.2 V @ 3 A. At the full 3 A rating, forward voltage would be higher. This part remains compatible for 3 A operation but exhibits improved efficiency at reduced current levels.

Q: Is inventory availability a factor in selecting substitute parts?

A: Inventory levels are provided for reference. S3M-TP offers the highest availability (321,300 pieces), while CFRC307-G has the lowest (864 pieces). For production applications, inventory availability should be confirmed with suppliers before final part selection.

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

A: While all substitute parts meet the core 1000 V, 3 A specifications, variations in forward voltage, recovery time, and reverse leakage current exist. For applications sensitive to these parameters, consistent use of a single part number is recommended to ensure uniform circuit performance across production batches.

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