S1MB R5G Equivalent & Substitute Parts

Part Overview

The S1MB R5G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 1000 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor while ensuring continued availability and compliance with applicable standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S1MB R5G is determined by the following critical parameters:

Primary Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 1000 V
Package / Case: Must be DO-214AA (SMB) or compatible surface mount package
Mounting Type: Must be Surface Mount
RoHS Status: Must maintain ROHS3 Compliance

Secondary Compatibility Criteria:

Current - Average Rectified (Io): Must equal or exceed 1 A
Voltage - Forward (Vf) (Max): Should not significantly exceed 1.1 V @ rated current to maintain thermal and circuit performance characteristics
Current - Reverse Leakage @ Vr: Must not exceed 5 µA @ 1000 V
Operating Temperature Range: Must support -55°C to 150°C junction temperature operation

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (1 A rated current): Parts with 1 A to 1.5 A current ratings that maintain the same voltage class and forward voltage characteristics, suitable for direct replacement without circuit modification.

Category B - Higher Current Capacity Alternatives (2 A to 3 A rated current): Parts with elevated current ratings that provide design margin and enhanced thermal performance while maintaining the same voltage class. These are suitable for applications where increased current capacity is beneficial or required.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Package	Product Status	Temp Range [°C]
S1MB R5G	Taiwan Semiconductor Corporation	1000	1	1.1 @ 1 A	DO-214AA (SMB)	Discontinued	-55 ~ 150
CGRB207-G	Comchip Technology	1000	2	1.1 @ 2 A	DO-214AA (SMB)	Active	-55 ~ 150
CGRB307-G	Comchip Technology	1000	3	1.1 @ 3 A	DO-214AA (SMB)	Active	-55 ~ 150
CFRB207-G	Comchip Technology	1000	2	1.3 @ 2 A	DO-214AA (SMB)	Active	-55 ~ 150
CURB207-G	Comchip Technology	1000	2	1.7 @ 2 A	DO-214AA (SMB)	Active	-55 ~ 150
ER3MB-TP	Micro Commercial Co	1000	3	1.7 @ 3 A	DO-214AA (SMB)	Active	-55 ~ 150
RS2M-13-F	Diodes Incorporated	1000	1.5	1.3 @ 1.5 A	DO-214AA (SMB)	Active	-65 ~ 150
S2M-13-F	Diodes Incorporated	1000	1.5	1.15 @ 1.5 A	DO-214AA (SMB)	Active	-65 ~ 150
S2M-E3/52T	Vishay General Semiconductor - Diodes Division	1000	1.5	1.15 @ 1.5 A	DO-214AA (SMB)	Active	-55 ~ 150

Engineering Selection Recommendations

Primary Recommendation - Category A (Direct Equivalents):

S2M-E3/52T (Vishay General Semiconductor - Diodes Division) is the preferred substitute for the S1MB R5G. This part maintains identical voltage and temperature specifications (-55°C to 150°C), provides 1.5 A current capacity with forward voltage of 1.15 V @ 1.5 A, and is actively manufactured with ROHS3 compliance. The 50% current margin over the original specification provides design robustness without introducing thermal or circuit performance concerns.

S2M-13-F (Diodes Incorporated) is an equivalent alternative with identical electrical characteristics to S2M-E3/52T, offering extended temperature range (-65°C to 150°C) and active product status. Both parts are suitable for direct replacement in existing designs.

Secondary Recommendation - Category B (Higher Current Capacity):

CGRB207-G (Comchip Technology) provides 2 A current capacity with forward voltage of 1.1 V @ 2 A, matching the original forward voltage specification exactly. This part is recommended for applications requiring increased current margin or thermal performance enhancement. Active product status and ROHS3 compliance are confirmed.

CGRB307-G (Comchip Technology) extends current capacity to 3 A while maintaining 1.1 V forward voltage @ 3 A. This part is suitable for designs where maximum current headroom is required. Inventory availability is substantial (38,451 units), supporting high-volume production requirements.

Alternative Consideration:

RS2M-13-F (Diodes Incorporated) offers 1.5 A capacity with extended temperature range (-65°C to 150°C) and active status. Forward voltage is 1.3 V @ 1.5 A, representing a 0.2 V increase over the original specification. This part is suitable for applications where extended low-temperature operation is required.

All recommended substitutes maintain DO-214AA (SMB) package compatibility, surface mount mounting type, and ROHS3 compliance. Selection between Category A and Category B parts depends on application current requirements and thermal design considerations.

Frequently Asked Questions (FAQ)

Q: Can the S1MB R5G be directly replaced with a higher current-rated part such as CGRB207-G (2 A)?

A: Yes. The CGRB207-G maintains the same 1000 V reverse voltage rating and DO-214AA (SMB) package. The 2 A current rating exceeds the original 1 A specification, providing design margin. Forward voltage is identical at 1.1 V, ensuring equivalent circuit performance. No circuit modification is required.

Q: What is the difference between S2M-E3/52T and S2M-13-F?

A: Both parts provide 1.5 A current capacity and 1.15 V forward voltage @ 1.5 A in DO-214AA (SMB) packages. S2M-E3/52T operates from -55°C to 150°C, matching the original S1MB R5G temperature range. S2M-13-F extends the lower temperature limit to -65°C. Selection depends on application temperature requirements.

Q: Why does CGRB307-G have higher forward voltage (1.1 V @ 3 A) compared to CGRB207-G (1.1 V @ 2 A)?

A: Forward voltage is specified at the rated current of each part. Both parts exhibit 1.1 V forward voltage at their respective rated currents. The voltage drop across the diode increases with current, but the maximum specified forward voltage remains 1.1 V at the rated current level for both parts.

Q: Is the S2M part number (MDD manufacturer) compatible with the S1MB R5G?

A: The S2M (MDD) is rated for 2 A in a surface mount SMA package (SOD-214AC), not the DO-214AA (SMB) package of the original part. Package incompatibility prevents direct substitution. Use S2M-13-F or S2M-E3/52T instead, which are available in DO-214AA (SMB) packages.

Q: What is the significance of the reverse recovery time (trr) specification?

A: Reverse recovery time is not specified for the S1MB R5G. Substitute parts with specified trr values (such as RS2M-13-F at 500 ns or CURB207-G at 75 ns) indicate fast or ultrafast recovery characteristics. These specifications do not affect compatibility for general-purpose rectification applications where the original part had no trr specification.

Q: Can RS2MA-13-F (SMA package) be used as a substitute?

A: No. RS2MA-13-F is packaged in DO-214AC (SMA), which is mechanically and electrically distinct from the DO-214AA (SMB) package of the S1MB R5G. Package incompatibility prevents direct substitution on existing PCBs. Use RS2M-13-F instead, which is available in DO-214AA (SMB) packaging.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All substitute parts listed in this document maintain ROHS3 compliance, matching the original S1MB R5G specification. Compliance with REACH and EAR99 export control classifications is also maintained across all alternatives.

Q: What is the impact of selecting CURB207-G with 75 ns reverse recovery time?

A: CURB207-G provides ultrafast recovery characteristics (75 ns trr) compared to the standard recovery speed of the original S1MB R5G (>500 ns). This part is suitable for high-frequency switching applications where fast recovery is beneficial. Forward voltage is higher at 1.7 V @ 2 A, which may increase power dissipation in low-voltage circuits. Thermal analysis is recommended for applications with tight power budgets.

Q: Which substitute provides the best thermal performance?

A: CGRB307-G and ER3MB-TP both provide 3 A current capacity, offering the highest current rating among available substitutes. Higher current capacity allows operation at lower current density, reducing junction temperature rise. CGRB307-G maintains 1.1 V forward voltage, while ER3MB-TP exhibits 1.7 V forward voltage. CGRB307-G is preferred for thermal performance optimization.

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