S2G-13 General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The S2G-13 is a general purpose rectifier diode manufactured by Diodes Incorporated, rated for 400 V DC reverse voltage and 1.5 A average rectified current in a surface mount SMB (DO-214AA) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for general purpose rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 1.5 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Surface Mount	-
Package / Case	DO-214AA, SMB	-
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitution of the S2G-13 is determined by the following critical parameters: voltage rating (400 V DC reverse), current rating (1.5 A average rectified), package type (DO-214AA SMB surface mount), and recovery speed classification (standard or fast recovery). Parts are grouped into three categories:

Parametric Equivalents: Parts with identical electrical specifications and the same package, differing only in packaging format (tape and reel versus cut tape) or RoHS compliance status. These provide direct functional replacement.

Current-Rated Substitutes: Parts with the same 400 V voltage rating and SMB package but different current ratings (1 A, 2 A, or 3 A). These are suitable when circuit design permits operation at alternative current levels.

Recovery Speed Variants: Parts with identical voltage and current ratings but different recovery speed classifications (fast recovery ≤500 ns versus standard recovery >500 ns). These affect switching characteristics and thermal performance in high-frequency applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	Package	Temp Range [°C]	Product Status	RoHS Status
S2G-13	Diodes Incorporated	400	1.5	1.15 @ 1.5 A	Standard >500ns	DO-214AA, SMB	-65 to 150	Discontinued	Non-compliant
S2G-13-F	Diodes Incorporated	400	1.5	1.15 @ 1.5 A	Standard >500ns	DO-214AA, SMB	-65 to 150	Active	ROHS3 Compliant
MRS1504T3G	onsemi	400	1.5	1.04 @ 1.5 A	Standard >500ns	DO-214AA, SMB	-55 to 150	Not For New Designs	ROHS3 Compliant
RS2G-E3/52T	Vishay General Semiconductor - Diodes Division	400	1.5	1.3 @ 1.5 A	Fast ≤500ns	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
RS2G-E3/5BT	Vishay General Semiconductor - Diodes Division	400	1.5	1.3 @ 1.5 A	Fast ≤500ns	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
S2G	Diotec Semiconductor	400	2	1.15 @ 2 A	Standard >500ns	DO-214AA, SMB	-50 to 150	Active	Not applicable
STTH1R04U	STMicroelectronics	400	1	1.5 @ 1 A	Fast ≤500ns	DO-214AA, SMB	-40 to 175	Active	ROHS3 Compliant
STTH1R04UY	STMicroelectronics	400	1	1.6 @ 1 A	Fast ≤500ns	DO-214AA, SMB	-40 to 175	Active	ROHS3 Compliant
STTH3R04U	STMicroelectronics	400	3	1.5 @ 3 A	Fast ≤500ns	DO-214AA, SMB	-40 to 175	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): S2G-13-F is the primary equivalent part, manufactured by Diodes Incorporated with identical electrical specifications and package format. This part is currently active in production and ROHS3 compliant, addressing the discontinuation status of the original S2G-13. The only difference is packaging format (tape and reel) and improved compliance status.

Active Production Alternatives (Same Voltage and Current Rating): MRS1504T3G (onsemi) provides equivalent 400 V / 1.5 A performance with marginally lower forward voltage (1.04 V versus 1.15 V). This part is marked "Not For New Designs" and should be used only for legacy system maintenance. RS2G-E3/52T and RS2G-E3/5BT (Vishay) offer 400 V / 1.5 A ratings with fast recovery characteristics and are actively produced. These parts feature higher forward voltage (1.3 V) and faster recovery time (150 ns), suitable for applications requiring improved switching performance.

Current-Rated Alternatives: STTH1R04U and STTH1R04UY (STMicroelectronics) provide 400 V / 1 A performance with fast recovery and extended temperature range (-40 to 175°C). These are suitable for applications where 1 A current capacity is sufficient. STTH3R04U (STMicroelectronics) provides 400 V / 3 A performance for applications requiring higher current capacity. S2G (Diotec Semiconductor) provides 400 V / 2 A performance with standard recovery characteristics.

Compliance Considerations: All recommended active production parts are ROHS3 compliant. The original S2G-13 is non-compliant; S2G-13-F addresses this requirement while maintaining identical specifications. Parts marked "Not For New Designs" should be restricted to legacy applications only.

Frequently Asked Questions (FAQ)

Q: Can S2G-13-F be used as a direct replacement for S2G-13? A: Yes. S2G-13-F is a parametric equivalent with identical electrical specifications (400 V, 1.5 A, 1.15 V forward voltage) and the same DO-214AA SMB package. The primary difference is packaging format (tape and reel) and ROHS3 compliance status. No circuit modifications are required.

Q: What is the difference between standard recovery and fast recovery diodes? A: Recovery speed refers to the time required for the diode to transition from conducting to blocking state. Standard recovery (>500 ns) is suitable for low-frequency rectification applications. Fast recovery (≤500 ns) reduces switching losses and is preferred in high-frequency switching applications. The S2G-13 uses standard recovery; fast recovery alternatives (RS2G series, STTH series) are available if switching performance is critical.

Q: Can I use STTH1R04U (1 A) instead of S2G-13 (1.5 A)? A: STTH1R04U can be used only if circuit design permits operation at 1 A maximum current. The lower current rating reduces thermal margin and may cause component stress if the circuit draws more than 1 A. Verify actual circuit current requirements before substitution.

Q: Can I use STTH3R04U (3 A) instead of S2G-13 (1.5 A)? A: Yes. STTH3R04U provides higher current capacity (3 A) at the same 400 V voltage rating and identical SMB package. This substitution increases thermal margin and is suitable for all applications designed for S2G-13. No circuit modifications are required.

Q: What is the impact of forward voltage differences between substitute parts? A: Forward voltage differences (ranging from 1.04 V to 1.6 V at rated current) affect power dissipation and thermal performance. Higher forward voltage increases heat generation. For most general purpose rectification applications, these differences are acceptable. In thermally constrained designs, select parts with lower forward voltage (MRS1504T3G at 1.04 V) to minimize heat dissipation.

Q: Are all substitute parts available in the same packaging formats? A: No. S2G-13-F is available in tape and reel format. RS2G-E3/52T is available in cut tape. RS2G-E3/5BT is available in tape and reel. STTH series parts are available in cut tape and digi-reel formats. Verify packaging availability with your supplier before design finalization.

Q: What is the operating temperature range difference between S2G-13 and substitute parts? A: S2G-13 operates from -65°C to 150°C. Most substitute parts operate from -55°C to 150°C or -40°C to 175°C. If operation below -55°C is required, S2G-13 or S2G-13-F are the only options. If operation above 150°C is required, STTH series parts (up to 175°C) are suitable.

Q: Is MRS1504T3G suitable for new designs? A: MRS1504T3G is marked "Not For New Designs" by the manufacturer. This part should be used only for legacy system maintenance and repair. For new designs, select S2G-13-F, RS2G series, or STTH series parts, all of which are actively produced.

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