Equivalent & Substitute Parts for S3G-13

Part Overview

The S3G-13 is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. This part is manufactured by Diodes Incorporated and is currently discontinued at DiGi Electronics. The discontinuation of the S3G-13 necessitates identification of functionally equivalent substitute components that maintain electrical and mechanical compatibility within the same package class and performance envelope.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Capacitance @ Vr, F	40	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S3G-13 is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Must not exceed application requirements
Current - Reverse Leakage @ Vr: Lower values indicate improved performance
Operating Temperature - Junction: Must encompass application operating range
Recovery Speed: Standard or Fast recovery acceptable based on circuit requirements
RoHS Compliance: Preferred for new designs but not mandatory for legacy applications

Substitute parts are grouped into two categories: direct functional equivalents (matching all primary criteria with identical forward voltage characteristics) and performance-enhanced alternatives (matching primary criteria with improved recovery characteristics or lower leakage current).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Speed	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status	RoHS Status
S3G-13	Diodes Incorporated	400	3	1.15 @ 3A	Standard >500ns	10 @ 400V	150	Discontinued	Non-compliant
S3G-13-F	Diodes Incorporated	400	3	1.15 @ 3A	Standard >500ns	10 @ 400V	150	Active	ROHS3 Compliant
S3G	Diotec Semiconductor	400	3	1.15 @ 3A	Standard >500ns	5 @ 1700V	150	Active	Not applicable
S3G-TP	Micro Commercial Co	400	3	1.2 @ 3A	Standard >500ns	10 @ 400V	150	Not For New Designs	ROHS3 Compliant
CURC304-G	Comchip Technology	400	3	1.3 @ 3A	Fast ≤500ns	5 @ 400V	150	Active	ROHS3 Compliant
ER3G-TP	Micro Commercial Co	400	3	1.25 @ 3A	Fast ≤500ns	5 @ 400V	175	Active	ROHS3 Compliant
ES3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400	3	1.1 @ 3A	Fast ≤500ns	10 @ 400V	150	Active	ROHS3 Compliant
RS3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.3 @ 2.5A	Fast ≤500ns	10 @ 400V	150	Active	ROHS3 Compliant
RS3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400	3	1.3 @ 2.5A	Fast ≤500ns	10 @ 400V	150	Active	ROHS3 Compliant
STTH3R04S	STMicroelectronics	400	3	1.5 @ 3A	Fast ≤500ns	5 @ 400V	175	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: S3G-13-F

The S3G-13-F is the direct functional equivalent of the S3G-13, manufactured by Diodes Incorporated. This part maintains identical electrical specifications including forward voltage (1.15 V @ 3 A), recovery speed (Standard >500ns), and reverse leakage current (10 µA @ 400 V). The S3G-13-F is currently in active production status with ROHS3 compliance, making it the preferred replacement for legacy S3G-13 applications. Inventory availability is substantial at 30,400 pieces.

Secondary Recommendations for RoHS-Compliant Designs:

For applications requiring RoHS3 compliance and accepting minor electrical variations, the following parts are suitable:

ES3G-E3/9AT (Vishay General Semiconductor - Diodes Division): Offers improved forward voltage performance (1.1 V @ 3 A) compared to the S3G-13, with fast recovery characteristics and active product status. Reverse leakage current matches the original specification at 10 µA @ 400 V. Inventory availability is excellent at 287,100 pieces.

ER3G-TP (Micro Commercial Co): Provides fast recovery characteristics with forward voltage of 1.25 V @ 3 A and extended maximum junction temperature to 175°C. Reverse leakage current is reduced to 5 µA @ 400 V. This part is suitable for applications requiring improved thermal performance.

Alternative for Extended Temperature Range:

STTH3R04S (STMicroelectronics): Supports maximum junction temperature of 175°C with fast recovery speed and reduced reverse leakage current (5 µA @ 400 V). Forward voltage is elevated at 1.5 V @ 3 A, requiring circuit evaluation for power dissipation impact. This part is appropriate for high-temperature applications.

Not Recommended for New Designs:

S3G-TP (Micro Commercial Co) carries a "Not For New Designs" product status designation and should not be selected for new circuit implementations despite RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the S3G-13-F be used as a direct replacement for the S3G-13?

A: Yes. The S3G-13-F is electrically and mechanically identical to the S3G-13, with matching voltage ratings (400 V), current ratings (3 A), forward voltage (1.15 V @ 3 A), and package type (DO-214AB, SMC). The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant). No circuit modifications are required.

Q: What is the difference between Standard and Fast recovery speed classifications?

A: Standard recovery diodes exhibit reverse recovery times exceeding 500 nanoseconds, while Fast recovery diodes exhibit reverse recovery times of 500 nanoseconds or less. The S3G-13 specifies Standard recovery. Substitute parts with Fast recovery characteristics (such as ES3G-E3/9AT, ER3G-TP, and STTH3R04S) will reduce switching losses in high-frequency applications but are electrically compatible with Standard recovery circuits.

Q: Are all substitute parts available in the same SMC package?

A: Yes. All substitute parts listed are packaged in DO-214AB (SMC) surface mount format, ensuring mechanical compatibility with existing PCB layouts and assembly processes. Packaging variations (Cut Tape, Digi-Reel, or Tape & Reel) affect supply chain logistics but do not alter electrical or mechanical performance.

Q: What is the significance of forward voltage differences among substitute parts?

A: Forward voltage (Vf) determines the voltage drop across the diode during conduction. The S3G-13 specifies 1.15 V @ 3 A. Substitute parts with lower Vf values (such as ES3G-E3/9AT at 1.1 V @ 3 A) reduce power dissipation, while parts with higher Vf values (such as STTH3R04S at 1.5 V @ 3 A) increase power dissipation. Circuit thermal analysis is required if Vf variation exceeds application tolerances.

Q: Is RoHS compliance mandatory for selecting a substitute part?

A: RoHS compliance is not mandatory for legacy applications or replacement of existing non-compliant components. However, RoHS3-compliant alternatives are preferred for new designs and applications subject to environmental regulations. The S3G-13-F provides RoHS3 compliance with identical electrical specifications to the original S3G-13.

Q: What does "Moisture Sensitivity Level (MSL) 1 (Unlimited)" indicate?

A: MSL 1 classification indicates that the component has unlimited shelf life and does not require special moisture-control handling during storage or assembly. All substitute parts listed carry MSL 1 classification, ensuring compatibility with standard manufacturing processes.

Q: Can substitute parts with higher maximum junction temperature be used in standard applications?

A: Yes. Parts with higher maximum junction temperature ratings (such as ER3G-TP and STTH3R04S at 175°C versus the S3G-13 at 150°C) are fully compatible with applications designed for lower temperature limits. The higher rating provides additional thermal margin but does not alter electrical performance in standard operating conditions.

Q: How does reverse leakage current affect circuit performance?

A: Reverse leakage current (Ir) represents the small current flowing through the diode in the reverse-biased state. The S3G-13 specifies 10 µA @ 400 V. Lower leakage current values (such as 5 µA in ER3G-TP and STTH3R04S) reduce standby power consumption and improve circuit efficiency. Higher leakage current does not affect forward conduction performance but increases standby power dissipation.

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