S5MB R5G Equivalent & Substitute Parts

Part Overview

The S5MB R5G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 1000 V DC reverse voltage and 5 A average rectified current in a DO-214AA (SMB) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for existing designs.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 5 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 1000 V
Capacitance @ Vr, F	40	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S5MB R5G is constrained by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 1000 V
Package / Case: DO-214AA (SMB) surface mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Current Rating Consideration: The S5MB R5G is rated for 5 A average rectified current. Substitute parts with lower current ratings (1.5 A, 2 A, or 3 A) operate within reduced current capacity and are suitable only for applications where the circuit current demand does not exceed the substitute part's rating. Substitute parts with equal or higher current ratings provide direct functional equivalence.

Recovery Speed Consideration: The S5MB R5G specifies Fast Recovery (≤ 500ns, > 200mA). Substitute parts with Standard Recovery (>500ns) exhibit slower switching characteristics and may introduce additional switching losses in high-frequency applications. Substitute parts with Fast Recovery or Ultrafast Recovery (≤ 75ns) maintain or improve upon the original specification.

Forward Voltage Consideration: Forward voltage drop varies among substitutes. Higher forward voltage results in increased power dissipation; lower forward voltage reduces dissipation. Selection depends on circuit thermal and efficiency requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Speed	trr (ns)	Package	Temp Range	Status
S5MB R5G	Taiwan Semiconductor Corporation	1000 V	5	1.1 V @ 5 A	Fast Recovery ≤ 500ns	—	DO-214AA (SMB)	-55 to 150°C	Discontinued
CFRB207-G	Comchip Technology	1000 V	2	1.3 V @ 2 A	Fast Recovery ≤ 500ns	500	DO-214AA (SMB)	—	Active
CGRB207-G	Comchip Technology	1000 V	2	1.1 V @ 2 A	Standard Recovery >500ns	—	DO-214AA (SMB)	—	Active
CGRB307-G	Comchip Technology	1000 V	3	1.1 V @ 3 A	Standard Recovery >500ns	—	DO-214AA (SMB)	—	Active
CURB207-G	Comchip Technology	1000 V	2	1.7 V @ 2 A	Fast Recovery ≤ 500ns	75	DO-214AA (SMB)	—	Active
ER3MB-TP	Micro Commercial Co	1000 V	3	1.7 V @ 3 A	Fast Recovery ≤ 500ns	75	DO-214AA (SMB)	-55 to 150°C	Active
RS2M-13-F	Diodes Incorporated	1000 V	1.5	1.3 V @ 1.5 A	Fast Recovery ≤ 500ns	500	DO-214AA (SMB)	-65 to 150°C	Active
S2M-13-F	Diodes Incorporated	1000 V	1.5	1.15 V @ 1.5 A	Standard Recovery >500ns	—	DO-214AA (SMB)	-65 to 150°C	Active
S2M-E3/52T	Vishay General Semiconductor - Diodes Division	1000 V	1.5	1.15 V @ 1.5 A	Standard Recovery >500ns	2000	DO-214AA (SMB)	-55 to 150°C	Active

Engineering Selection Recommendations

Direct Functional Equivalents (Preferred): No substitute part in the provided list matches all electrical parameters of the S5MB R5G. The S5MB R5G is rated for 5 A, while all available substitutes are rated for 3 A or lower. Selection of a substitute requires circuit current analysis to confirm operation within the substitute part's current rating.

Selection by Current Rating:

For circuits requiring 3 A or less:

CGRB307-G (Comchip Technology): 3 A rating, 1000 V, DO-214AA package, ROHS3 compliant, active product status. Standard recovery speed. Forward voltage 1.1 V @ 3 A matches the original specification.
ER3MB-TP (Micro Commercial Co): 3 A rating, 1000 V, DO-214AA package, ROHS3 compliant, active product status. Fast recovery speed (75 ns). Operating temperature range -55 to 150°C matches the original. Forward voltage 1.7 V @ 3 A is elevated.

For circuits requiring 2 A or less:

CGRB207-G (Comchip Technology): 2 A rating, 1000 V, DO-214AA package, ROHS3 compliant, active product status. Forward voltage 1.1 V @ 2 A. Standard recovery speed.
CFRB207-G (Comchip Technology): 2 A rating, 1000 V, DO-214AA package, ROHS3 compliant, active product status. Fast recovery speed (500 ns). Forward voltage 1.3 V @ 2 A.
CURB207-G (Comchip Technology): 2 A rating, 1000 V, DO-214AA package, ROHS3 compliant, active product status. Ultrafast recovery speed (75 ns). Forward voltage 1.7 V @ 2 A is elevated.

For circuits requiring 1.5 A or less:

RS2M-13-F (Diodes Incorporated): 1.5 A rating, 1000 V, DO-214AA package, ROHS3 compliant, active product status. Fast recovery speed (500 ns). Operating temperature range -65 to 150°C. Forward voltage 1.3 V @ 1.5 A.
S2M-13-F (Diodes Incorporated): 1.5 A rating, 1000 V, DO-214AA package, ROHS3 compliant, active product status. Standard recovery speed. Operating temperature range -65 to 150°C. Forward voltage 1.15 V @ 1.5 A.
S2M-E3/52T (Vishay General Semiconductor - Diodes Division): 1.5 A rating, 1000 V, DO-214AA package, ROHS3 compliant, active product status. Standard recovery speed (2 µs). Operating temperature range -55 to 150°C. Forward voltage 1.15 V @ 1.5 A. Reverse leakage 1 µA @ 1000 V (lower than original).

Compliance Verification: All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part rated for 3 A in a circuit designed for the 5 A S5MB R5G?

A: Substitution is permissible only if the actual circuit current demand does not exceed 3 A. The circuit must be analyzed to confirm that peak and average current requirements remain within the substitute part's rating. Operating a diode above its rated current causes excessive junction temperature rise and accelerated device failure.

Q: What is the difference between Fast Recovery and Standard Recovery diodes?

A: Recovery speed refers to the time required for the diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Fast Recovery (≤ 500ns) diodes switch more quickly, reducing switching losses in high-frequency applications. Standard Recovery (>500ns) diodes exhibit slower transitions and higher switching losses. The S5MB R5G specifies Fast Recovery; substitutes with Standard Recovery may increase power dissipation in switching circuits.

Q: Does forward voltage difference affect circuit performance?

A: Forward voltage drop directly impacts power dissipation and circuit efficiency. Higher forward voltage (e.g., 1.7 V vs. 1.1 V) results in greater power loss as heat. In low-current or low-frequency applications, this difference may be negligible. In high-current or thermally constrained designs, forward voltage selection becomes critical. Verify that thermal management remains adequate with the selected substitute.

Q: Are all substitute parts available in the same DO-214AA (SMB) package?

A: Yes. All substitute parts listed are packaged in DO-214AA (SMB) surface mount format, ensuring mechanical and footprint compatibility with the original S5MB R5G design. No PCB layout modifications are required.

Q: What is the significance of operating temperature range?

A: The S5MB R5G specifies -55°C to 150°C junction temperature range. Most substitute parts specify only maximum junction temperature (150°C) without a minimum. The S5MB R5G, ER3MB-TP, and S2M-E3/52T explicitly state -55°C to 150°C, matching the original specification. For applications requiring operation at temperatures below 0°C, these three parts are preferred.

Q: Can I substitute a part with lower reverse leakage current?

A: Yes. Lower reverse leakage current (e.g., 1 µA vs. 10 µA) represents improved device quality and reduced standby power consumption. This is a beneficial substitution characteristic. The S2M-E3/52T exhibits 1 µA reverse leakage compared to the original 10 µA, providing superior performance in this parameter.

Q: Is ROHS3 compliance mandatory for my application?

A: ROHS3 compliance is a regulatory requirement in many jurisdictions for electronic equipment sold in the European Union and other regions. All substitute parts listed are ROHS3 compliant, matching the original part's compliance status. Verify regulatory requirements for your specific application and market.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions and requires no special handling, storage, or baking procedures prior to soldering. All listed substitute parts carry MSL 1 rating, matching the original part's handling requirements.

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