S2M Equivalent & Substitute Parts

Part Overview

The S2M is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 1000 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design and procurement requirements. The S2M operates across a junction temperature range of -55°C to 150°C with standard recovery characteristics and a reverse recovery time of 2 µs.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	10	µA @ 1000 V
Speed Classification	Standard Recovery >500ns	-
Mounting Type	Surface Mount	-
Package / Case	DO-214AA, SMB	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	RoHS non-compliant	-

Substitute Part Grouping Explanation

Substitution of the S2M is determined by the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V
Current - Average Rectified (Io): 2 A
Package / Case: DO-214AA, SMB (surface mount)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Forward voltage (Vf) characteristics
Reverse recovery time (trr) and speed classification
Reverse leakage current
Operating temperature range
RoHS compliance status

Substitute parts are grouped into two categories:

Category 1: Direct Current Rating Equivalents (2 A) Parts with identical 2 A current rating and 1000 V voltage rating maintain full electrical equivalence for the primary application requirements. These include CGRB207-G and CMR2-10 variants.

Category 2: Reduced Current Rating Alternatives (1 A to 1.5 A) Parts with lower current ratings (1 A or 1.5 A) operate within the same voltage class but with reduced current capacity. These are suitable for applications where the full 2 A rating is not required. This category includes CMR1-10 variants and RS2M-13-F.

Category 3: Higher Current Rating Alternatives (3 A) Parts with 3 A rating exceed the original specification but maintain voltage compatibility and package form factor. The CMR3U-10M variants provide additional current margin.

All substitute parts maintain the DO-214AA (SMB) surface mount package and are compatible with existing PCB layouts. RoHS3 compliance is available across all active substitute options, addressing the non-compliance status of the obsolete S2M.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs/ns]	Reverse Leakage @ Vr [µA]	Speed	Tj Range [°C]	Package	Status	RoHS
S2M	Micro Commercial Co	1000	2	1.15 @ 2A	2 µs	10 @ 1000V	Standard >500ns	-55 to 150	DO-214AA, SMB	Obsolete	Non-compliant
CGRB207-G	Comchip Technology	1000	2	1.1 @ 2A	-	5 @ 1000V	Standard >500ns	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
CMR2-10 BK PBFREE	Central Semiconductor Corp	1000	2	1.1 @ 2A	2.5 µs	5 @ 1000V	Standard >500ns	-65 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
CMR2-10 TR13 PBFREE	Central Semiconductor Corp	1000	2	1.1 @ 2A	2.5 µs	5 @ 1000V	Standard >500ns	-65 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
CMR1-10 BK PBFREE	Central Semiconductor Corp	1000	1	1.1 @ 1A	-	10 @ 1000V	Standard >500ns	-65 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
CMR1-10 TR13 PBFREE	Central Semiconductor Corp	1000	1	1.1 @ 1A	-	10 @ 1000V	Fast ≤500ns	-60 to 175	DO-214AA, SMB	Active	ROHS3 Compliant
CMR1U-10 BK PBFREE	Central Semiconductor Corp	1000	1	1.7 @ 1A	0.1 µs	5 @ 1000V	Fast ≤500ns	-65 to 175	DO-214AA, SMB	Active	ROHS3 Compliant
CMR1U-10 TR13 PBFREE	Central Semiconductor Corp	1000	1	1.7 @ 1A	0.1 µs	5 @ 1000V	Fast ≤500ns	-65 to 175	DO-214AA, SMB	Active	ROHS3 Compliant
RS2M-13-F	Diodes Incorporated	1000	1.5	1.3 @ 1.5A	0.5 µs	5 @ 1000V	Fast ≤500ns	-65 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
CMR3U-10M BK PBFREE	Central Semiconductor Corp	1000	3	2 @ 3A	0.1 µs	5 @ 1000V	Fast ≤500ns	-65 to 175	DO-214AA, SMB	Active	ROHS3 Compliant
CMR3U-10M TR13 PBFREE	Central Semiconductor Corp	1000	3	2 @ 3A	0.1 µs	5 @ 1000V	Fast ≤500ns	-65 to 175	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (2 A Rating):

CGRB207-G (Comchip Technology) and CMR2-10 variants (Central Semiconductor Corp) provide the closest electrical equivalence to the S2M. Both maintain the 1000 V / 2 A specification with identical package form factor. CGRB207-G offers slightly lower forward voltage (1.1 V vs. 1.15 V) and reduced reverse leakage (5 µA vs. 10 µA). CMR2-10 variants are available in both bulk and tape & reel packaging, with extended temperature range (-65°C to 150°C) compared to the S2M (-55°C to 150°C). All direct replacements are RoHS3 compliant, addressing the non-compliance status of the obsolete S2M.

For Current-Reduced Applications (1 A to 1.5 A):

CMR1-10 and CMR1U-10 variants (Central Semiconductor Corp) and RS2M-13-F (Diodes Incorporated) are suitable where application requirements do not demand the full 2 A rating. RS2M-13-F provides an intermediate 1.5 A rating with fast recovery characteristics (0.5 µs) and is available in tape & reel packaging with high inventory levels (20,250 pcs). CMR1U-10 variants offer the fastest recovery time (100 ns) and extended temperature range (-65°C to 175°C), though with higher forward voltage (1.7 V @ 1 A).

For Higher Current Margin (3 A Rating):

CMR3U-10M variants (Central Semiconductor Corp) provide 3 A capacity with fast recovery (100 ns) and extended temperature range (-65°C to 175°C). The bulk variant (CMR3U-10M BK PBFREE) maintains DO-214AA (SMB) package compatibility. The tape & reel variant (CMR3U-10M TR13 PBFREE) uses DO-214AB (SMC) package, which is physically larger and requires PCB layout modification.

Compliance Considerations:

All active substitute parts are RoHS3 compliant, providing regulatory advantage over the non-compliant S2M. Moisture sensitivity level (MSL) is 1 (Unlimited) across all options, matching the original part's handling requirements.

Frequently Asked Questions (FAQ)

Q: Can CGRB207-G directly replace the S2M without circuit modification?

A: Yes. CGRB207-G maintains identical voltage (1000 V) and current (2 A) ratings, operates in the same DO-214AA (SMB) package, and is pin-compatible. Forward voltage is slightly lower (1.1 V vs. 1.15 V), which is favorable for circuit performance. RoHS3 compliance provides additional regulatory benefit.

Q: What is the difference between CMR2-10 BK PBFREE and CMR2-10 TR13 PBFREE?

A: Both parts are electrically identical with 1000 V / 2 A ratings and identical electrical characteristics. The primary difference is packaging: BK PBFREE is supplied in bulk, while TR13 PBFREE is supplied in tape & reel format. Selection depends on procurement and assembly requirements. TR13 PBFREE offers higher inventory availability (3,500 pcs vs. 819 pcs).

Q: Why do some substitutes have higher forward voltage (CMR1U-10 at 1.7 V vs. S2M at 1.15 V)?

A: Forward voltage variation reflects different semiconductor process technology and doping profiles. CMR1U-10 variants employ fast recovery technology (100 ns trr) which inherently produces higher forward voltage. This trade-off between recovery speed and forward voltage drop is a fundamental characteristic of rectifier diode design. Selection should be based on circuit requirements for switching speed versus power dissipation.

Q: Can CMR1-10 (1 A rating) be used in place of S2M (2 A rating)?

A: CMR1-10 is suitable only if the application circuit operates at or below 1 A average rectified current. Using a 1 A rated diode in a 2 A application exceeds the component's current rating and creates reliability risk. Verify actual circuit current requirements before selecting a reduced-rating substitute.

Q: What is the significance of "Fast Recovery" versus "Standard Recovery" classification?

A: Recovery speed affects switching transient behavior and electromagnetic interference characteristics. Standard recovery (>500 ns) is suitable for line-frequency and low-frequency switching applications. Fast recovery (≤500 ns) is required for high-frequency switching circuits. The S2M uses standard recovery; substitutes with fast recovery (CMR1U-10, CMR1-10 TR13, RS2M-13-F, CMR3U-10M) are compatible but not required unless circuit design specifically demands faster switching.

Q: Why does CMR3U-10M TR13 PBFREE use DO-214AB (SMC) package instead of DO-214AA (SMB)?

A: The 3 A current rating requires larger semiconductor die and lead frame geometry, necessitating the larger DO-214AB (SMC) package. This package change requires PCB layout modification and is not a direct drop-in replacement. Use CMR3U-10M BK PBFREE (DO-214AA, SMB) if package compatibility is required.

Q: Are all substitute parts available in both bulk and tape & reel packaging?

A: No. Availability varies by manufacturer and part number. CMR2-10, CMR1-10, and CMR1U-10 are available in both formats. CGRB207-G and RS2M-13-F are available in tape & reel only. CMR3U-10M BK PBFREE is available in bulk; CMR3U-10M TR13 PBFREE is available in tape & reel. Verify packaging availability with supplier before design finalization.

Q: What is the operating temperature advantage of CMR1U-10 TR13 PBFREE (-65°C to 175°C) compared to S2M (-55°C to 150°C)?

A: CMR1U-10 TR13 PBFREE extends the upper temperature limit by 25°C (to 175°C) and lower limit by 10°C (to -65°C), providing broader environmental operating range. This is beneficial for applications in high-temperature environments or with stringent thermal margin requirements. However, this advantage applies only if the 1 A current rating meets circuit requirements.

Q: Is RoHS3 compliance mandatory for S2M replacement?

A: RoHS3 compliance is mandatory for products sold into European Union markets and increasingly required by major OEMs globally. All active substitute parts listed are RoHS3 compliant, whereas the S2M is non-compliant. For new designs or products requiring regulatory compliance, RoHS3-compliant substitutes are necessary.

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