S3MHM6G Equivalent & Substitute Parts

Part Overview

The S3MHM6G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 1000 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant, making it suitable for automotive and industrial applications requiring high-reliability rectification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the S3MHM6G is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 1000 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Package / Case: Must be DO-214AB (SMC) or compatible surface mount package
Mounting Type: Surface Mount required
Operating Temperature Range: Must accommodate -55°C to 150°C junction temperature or higher

Secondary Compatibility Factors:

Forward voltage (Vf) characteristics at rated current
Reverse recovery time (trr) and recovery speed classification
Reverse leakage current at rated voltage
RoHS and automotive compliance status

Substitute parts are grouped into three categories:

Category 1 - Direct Equivalents (1000 V, 3 A, DO-214AB SMC): Parts with identical voltage and current ratings in the same package. These provide pin-for-pin and functional equivalence.

Category 2 - Higher Current Ratings (1000 V, 5 A or 8 A, DO-214AB SMC): Parts with elevated current capacity in the same package. These are electrically compatible and provide design margin for higher current applications.

Category 3 - Package Variants (1000 V, 3 A, SMB or alternative SMC): Parts with identical electrical ratings but different surface mount packages (DO-214AA SMB versus DO-214AB SMC). These require PCB layout modification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs]	Ir @ Vr [µA]	Package	Product Status
S3MHM6G	Taiwan Semiconductor	1000	3	1.15 @ 3A	1.5	5 @ 1000V	DO-214AB (SMC)	Discontinued
S3MH	Taiwan Semiconductor	1000	3	1.15 @ 3A	1.5	10 @ 1000V	DO-214AB (SMC)	Active
S3M-13-F	Diodes Incorporated	1000	3	1.15 @ 3A	—	10 @ 1000V	DO-214AB (SMC)	Active
S3M-TP	Micro Commercial Co	1000	3	1.2 @ 3A	—	10 @ 1000V	DO-214AB (SMC)	Active
RS3M-13-F	Diodes Incorporated	1000	3	1.3 @ 3A	0.5	5 @ 1000V	DO-214AB (SMC)	Active
S3MB-13-F	Diodes Incorporated	1000	3	1.15 @ 3A	—	10 @ 1000V	DO-214AA (SMB)	Active
RS3MB-13-F	Diodes Incorporated	1000	3	1.3 @ 3A	0.5	5 @ 1000V	DO-214AA (SMB)	Active
S5MC-13-F	Diodes Incorporated	1000	5	1.15 @ 5A	—	10 @ 1000V	DO-214AB (SMC)	Active
CGRC507-G	Comchip Technology	1000	5	1.15 @ 5A	—	10 @ 1000V	DO-214AB (SMC)	Active
S5ML-TP	Micro Commercial Co	1000	5	1.2 @ 5A	—	10 @ 1000V	DO-214AB (SMC)	Active
S8MC-13	Diodes Incorporated	1000	8	0.985 @ 8A	—	10 @ 1000V	DO-214AB (SMC)	Active

Engineering Selection Recommendations

Direct Replacement (Same Electrical and Package Specifications):

The S3MH (Taiwan Semiconductor) is the primary direct substitute for the S3MHM6G. Both parts share identical voltage (1000 V), current (3 A), forward voltage characteristics (1.15 V @ 3 A), and package format (DO-214AB SMC). The S3MH is currently active in production with 3735 units in stock, ensuring supply continuity. Reverse leakage current is slightly elevated (10 µA versus 5 µA), which remains within acceptable limits for general-purpose rectification applications.

Equivalent Alternatives (1000 V, 3 A, DO-214AB SMC):

S3M-13-F (Diodes Incorporated) and S3M-TP (Micro Commercial Co) provide functional equivalence with identical voltage and current ratings in the same package. S3M-13-F maintains the 1.15 V forward voltage specification and is available in high volume (15100 units). S3M-TP offers comparable performance with 1.2 V forward voltage and exceptional inventory availability (321300 units). Both parts carry ROHS3 compliance and automotive-grade qualification.

Fast Recovery Alternative:

RS3M-13-F (Diodes Incorporated) offers fast recovery characteristics (500 ns trr) compared to the standard recovery profile of the S3MHM6G (1.5 µs). This part maintains 1000 V and 3 A ratings with identical reverse leakage (5 µA @ 1000 V) and is suitable for applications requiring reduced switching losses. Operating temperature range extends to -65°C, providing additional thermal margin.

Package Variant Alternatives (SMB Package):

S3MB-13-F and RS3MB-13-F (Diodes Incorporated) provide identical electrical specifications in the DO-214AA (SMB) package format. These require PCB layout modification but offer the same electrical performance. S3MB-13-F maintains standard recovery characteristics, while RS3MB-13-F provides fast recovery operation.

Higher Current Capacity Options (1000 V, 5 A or 8 A, DO-214AB SMC):

S5MC-13-F (Diodes Incorporated), CGRC507-G (Comchip Technology), and S5ML-TP (Micro Commercial Co) provide 5 A current rating in the same DO-214AB SMC package. S8MC-13 (Diodes Incorporated) offers 8 A capacity with reduced forward voltage (985 mV @ 8 A). These parts are electrically compatible with the S3MHM6G and provide design margin for applications with higher current requirements or thermal considerations.

All recommended substitutes maintain ROHS3 compliance, automotive-grade qualification (AEC-Q101 where specified), and surface mount compatibility. Selection should be based on specific application requirements for current capacity, recovery speed, and package constraints.

Frequently Asked Questions (FAQ)

Q: Can the S3MH directly replace the S3MHM6G without PCB modification?

A: Yes. The S3MH is a direct substitute with identical electrical specifications (1000 V, 3 A, 1.15 V forward voltage) and package format (DO-214AB SMC). No PCB layout changes are required. The primary difference is packaging format (Tape & Reel for S3MH versus the original packaging), which does not affect circuit performance.

Q: What is the difference between DO-214AB (SMC) and DO-214AA (SMB) packages?

A: DO-214AB (SMC) and DO-214AA (SMB) are distinct surface mount packages with different physical dimensions and land patterns. Parts in SMB package (such as S3MB-13-F) require PCB footprint modification compared to SMC packages. Electrical performance is identical; the difference is mechanical and requires design layout changes.

Q: Can I use a 5 A rated diode (S5MC-13-F) in place of the 3 A S3MHM6G?

A: Yes. The S5MC-13-F is electrically compatible with identical voltage rating (1000 V) and superior current capacity (5 A versus 3 A). This substitution provides design margin and is suitable for applications where current requirements may increase or where thermal performance benefits from higher-rated components. No circuit modification is required.

Q: What is the significance of reverse recovery time (trr) in diode selection?

A: Reverse recovery time affects switching losses and electromagnetic interference characteristics. The S3MHM6G has standard recovery (1.5 µs trr). Fast recovery alternatives like RS3M-13-F (500 ns trr) reduce switching losses in high-frequency applications. For general-purpose rectification at line frequency or low switching rates, standard recovery diodes are appropriate.

Q: Are all substitute parts automotive-qualified?

A: The S3MHM6G carries AEC-Q101 automotive qualification. Direct substitutes S3MH and S3M-13-F maintain automotive-grade designation. Fast recovery alternatives (RS3M-13-F, RS3MB-13-F) and higher current options (S5MC-13-F, S8MC-13) are also automotive-qualified. Verify specific qualification requirements for your application.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel packaging is supplied on continuous reels for automated assembly processes, while Cut Tape is supplied in individual tape segments. Both formats contain identical components; the difference is in supply format and handling. Selection depends on manufacturing process requirements and volume.

Q: Can I substitute a part with higher reverse leakage current (10 µA versus 5 µA)?

A: Yes. Reverse leakage current of 10 µA at 1000 V is acceptable for general-purpose rectification applications. The difference (5 µA) represents minimal additional leakage and does not affect circuit performance in standard power supply designs. Applications with stringent leakage requirements should specify parts with lower reverse leakage ratings.

Q: What does ROHS3 compliance indicate?

A: ROHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended substitutes carry ROHS3 compliance, ensuring environmental and regulatory conformance for industrial and automotive applications.

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