S2G Equivalent & Substitute Parts Reference

Part Overview

The S2G is a general-purpose rectifier diode manufactured by Diotec Semiconductor, rated for 400 V DC reverse voltage and 2 A average rectified current in a Surface Mount DO-214AA (SMB) package. The device is classified as Active product status with standard recovery characteristics and operates across a junction temperature range of -50°C to 150°C. Substitute parts are identified to provide alternatives when the primary part is unavailable or when application requirements permit higher current ratings or improved recovery characteristics within the same voltage class and package form factor.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 2	V @ A
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	5 @ 1700	µA @ V
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-50 to 150	°C
Product Status	Active	—

Substitute Part Grouping Explanation

Substitution of the S2G with the STTH3R04U is permissible based on the following criteria:

Matching Parameters:

Voltage - DC Reverse (Vr) (Max): Both rated 400 V
Package / Case: Both use DO-214AA, SMB form factor
Mounting Type: Both are Surface Mount
Product Status: Both are Active

Allowable Differences:

Current - Average Rectified (Io): STTH3R04U rated 3 A versus S2G rated 2 A. The higher current rating of the substitute part does not restrict its use in applications designed for 2 A operation.
Reverse Recovery Time (trr): STTH3R04U specified at 35 ns (fast recovery) versus S2G at 1.5 µs (standard recovery). Faster recovery characteristics are compatible with standard recovery applications.
Voltage - Forward (Vf) (Max): STTH3R04U specified at 1.5 V @ 3 A versus S2G at 1.15 V @ 2 A. Forward voltage differences are acceptable when operating within the substitute part's rated current envelope.

Parameter Comparison

Parameter	S2G (Diotec)	STTH3R04U (STMicroelectronics)	Unit
Voltage - DC Reverse (Vr) (Max)	400	400	V
Current - Average Rectified (Io)	2	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 2	1.5 @ 3	V @ A
Reverse Recovery Time (trr)	1.5	35	µs / ns
Current - Reverse Leakage @ Vr	5 @ 1700	5 @ 400	µA @ V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	—
Operating Temperature - Junction (Max)	150	175	°C
Product Status	Active	Active	—
RoHS Status	Not applicable	ROHS3 Compliant	—

Engineering Selection Recommendations

Primary Part (S2G): Select when Diotec Semiconductor supply chain is preferred and standard recovery characteristics are specified in the application design. The S2G is suitable for general-purpose rectification in 400 V, 2 A circuits with standard recovery requirements.

Substitute Part (STTH3R04U): Select when STMicroelectronics supply is available or when the following conditions are met: (1) application current demand does not exceed 3 A; (2) circuit topology benefits from or tolerates faster recovery characteristics; (3) ROHS3 compliance is required; (4) higher maximum junction temperature rating (175°C) provides thermal margin. The STTH3R04U is a direct functional substitute within the specified voltage and package constraints.

Both parts share identical 400 V reverse voltage rating and DO-214AA (SMB) package form factor, ensuring mechanical and electrical compatibility in PCB layouts designed for the S2G.

Frequently Asked Questions (FAQ)

Q: Can the STTH3R04U replace the S2G in all applications?

A: The STTH3R04U is a functional substitute for the S2G in applications where the circuit current demand does not exceed 2 A (the S2G rating). The substitute part's higher 3 A rating and faster recovery characteristics do not restrict its use in lower-current applications. Both parts are rated 400 V and use identical DO-214AA (SMB) packaging.

Q: What is the significance of the different reverse recovery times?

A: The S2G has a reverse recovery time of 1.5 µs (standard recovery), while the STTH3R04U has 35 ns (fast recovery). Fast recovery diodes are compatible with standard recovery applications. The faster switching characteristic of the STTH3R04U does not create incompatibility; it represents an improved performance characteristic.

Q: Are there package compatibility concerns?

A: No. Both the S2G and STTH3R04U use the DO-214AA (SMB) Surface Mount package. PCB footprints, solder pad layouts, and mechanical mounting are identical. No PCB redesign is required for substitution.

Q: Does the forward voltage difference affect circuit operation?

A: The S2G specifies 1.15 V forward voltage at 2 A, while the STTH3R04U specifies 1.5 V at 3 A. When the STTH3R04U operates at 2 A (the S2G design point), its forward voltage will be lower than the specified 1.5 V maximum. Forward voltage differences of this magnitude are typically accommodated in rectifier circuit designs and do not prevent substitution.

Q: What compliance differences exist between the two parts?

A: The STTH3R04U is ROHS3 compliant, while the S2G RoHS status is listed as not applicable. If regulatory compliance with ROHS3 is required, the STTH3R04U is the appropriate selection. Both parts share the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: Can the S2G be used in place of the STTH3R04U?

A: The S2G is not a substitute for the STTH3R04U in applications requiring the full 3 A current rating. The S2G is rated for 2 A maximum average rectified current and would be undersized for 3 A operation. Substitution is unidirectional: STTH3R04U can replace S2G, but not vice versa.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message