Equivalent & Substitute Parts for S4M General Purpose Rectifier Diode

Part Overview

The S4M is a general purpose rectifier diode manufactured by Semtech Corporation, rated for 400V DC reverse voltage and 2A average rectified current in a Surface Mount SMB (DO-214AA) package. This component is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

The S4M operates as a standard recovery diode suitable for general rectification applications requiring 400V blocking capability. Due to its discontinued status, alternative components with compatible electrical and mechanical specifications are required to maintain design continuity and ensure component availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	500	nA @ 400 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65°C ~ 175°C	°C
RoHS Status	RoHS Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the S4M are selected based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): 400V minimum
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Technology: Standard recovery diode

Secondary Compatibility Criteria:

Current - Average Rectified (Io): Equal to or greater than 2A
Reverse Recovery Time (trr): Standard recovery characteristics
Operating Temperature Range: Sufficient for application requirements
RoHS Compliance: Environmental and regulatory compliance

The substitute parts are grouped into two categories:

Category 1 - Direct Current Rating Match (2A): S2G R5G (Taiwan Semiconductor Corporation) maintains the exact 2A current rating with 400V reverse voltage in DO-214AA package.

Category 2 - Current Rating Variations: S2G-13-F (Diodes Incorporated) provides 1.5A rating, suitable for applications with lower current requirements. S3GB-13-F (Diodes Incorporated) provides 3A rating, suitable for applications requiring higher current capacity.

All substitute parts maintain 400V reverse voltage rating, Surface Mount SMB packaging, and standard recovery characteristics.

Parameter Comparison

Parameter	S4M (Semtech)	S2G R5G (Taiwan Semi)	S2G-13-F (Diodes Inc)	S3GB-13-F (Diodes Inc)
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	2 A	2 A	1.5 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.15 V @ 2 A	1.15 V @ 1.5 A	1.15 V @ 3 A
Reverse Recovery Time (trr)	2 µs	1.5 µs	Not specified	Not specified
Current - Reverse Leakage @ Vr	500 nA @ 400 V	1 µA @ 400 V	5 µA @ 400 V	10 µA @ 400 V
Capacitance @ Vr, F	23 pF @ 5V, 1MHz	30 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	40 pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Product Status	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics	Active	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

S2G R5G (Taiwan Semiconductor Corporation): This part provides the closest electrical match to the S4M with identical 400V and 2A ratings in the same DO-214AA SMB package. However, the operating temperature range is reduced to -55°C ~ 150°C compared to the S4M's -65°C ~ 175°C. This part is also discontinued at DiGi Electronics. Selection is appropriate for applications operating within the -55°C to 150°C range where the exact 2A current rating is required.

S2G-13-F (Diodes Incorporated): This part is currently active and available in high volume (57,100 pcs in stock). It maintains 400V reverse voltage and DO-214AA SMB packaging with ROHS3 compliance and REACH unaffected status. The 1.5A current rating is lower than the S4M's 2A specification. Selection is appropriate for applications with current requirements at or below 1.5A, or where design margin permits operation at reduced current capacity.

S3GB-13-F (Diodes Incorporated): This part is currently active and available in high volume (34,600 pcs in stock). It maintains 400V reverse voltage and DO-214AA SMB packaging with ROHS3 compliance and REACH unaffected status. The 3A current rating exceeds the S4M's 2A specification, providing additional current capacity margin. Selection is appropriate for applications requiring the full 2A rating or higher, with the benefit of increased design margin and component availability.

For new designs and ongoing procurement, S2G-13-F or S3GB-13-F are recommended due to active product status and confirmed availability.

Frequently Asked Questions (FAQ)

Q: Can S2G-13-F (1.5A) be used as a direct replacement for S4M (2A)?

A: S2G-13-F can be used in applications where the actual circuit current does not exceed 1.5A. The S4M is rated for 2A average rectified current; therefore, S2G-13-F is suitable only if the application's current requirement is confirmed to be 1.5A or lower. For applications requiring the full 2A capacity, S3GB-13-F (3A) is the appropriate selection.

Q: What is the difference in operating temperature range between S4M and the substitute parts?

A: The S4M operates from -65°C to 175°C. S2G R5G operates from -55°C to 150°C, while both S2G-13-F and S3GB-13-F operate from -65°C to 150°C. Applications requiring operation above 150°C are not compatible with any of the listed substitutes. Applications requiring operation below -55°C are compatible only with S4M, S2G-13-F, or S3GB-13-F.

Q: Are all substitute parts in the same SMB package?

A: Yes. All substitute parts use the DO-214AA SMB package, identical to the S4M. No PCB layout modifications are required for package compatibility.

Q: What is the difference in reverse leakage current between these parts?

A: The S4M has 500 nA reverse leakage at 400V. S2G R5G has 1 µA, S2G-13-F has 5 µA, and S3GB-13-F has 10 µA. Higher reverse leakage current may affect circuit performance in high-impedance applications. For applications sensitive to leakage current, the S4M or S2G R5G are preferred.

Q: Which substitute part has the best availability?

A: S2G-13-F has the highest inventory with 57,100 pcs in stock and active product status. S3GB-13-F has 34,600 pcs in stock and active status. S2G R5G has 3,615 pcs available but is discontinued at DiGi Electronics.

Q: Are all parts RoHS compliant?

A: Yes. The S4M is RoHS Compliant. S2G R5G, S2G-13-F, and S3GB-13-F are all ROHS3 Compliant, meeting current environmental standards.

Q: Can S3GB-13-F (3A) be used in place of S4M (2A)?

A: Yes. S3GB-13-F with 3A rating can be used in applications designed for 2A operation. The higher current rating provides design margin and does not create compatibility issues. This part is recommended for new designs due to active status and high availability.

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