Equivalent & Substitute Parts for RS3G-13

Part Overview

The RS3G-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 component is classified as discontinued at DiGi Electronics, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement. The RS3G-13 employs fast recovery technology with a reverse recovery time of 150 ns and operates across a junction temperature range of -65°C to 150°C. Equivalent substitute parts maintain the same electrical ratings and mechanical compatibility while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	50	pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitution of the RS3G-13 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Ranges:

Voltage - Forward (Vf) (Max) @ If: 1.1 V to 1.5 V (within fast recovery classification)
Reverse Recovery Time (trr): 35 ns to 150 ns (fast recovery devices only)
Current - Reverse Leakage @ Vr: 5 µA to 10 µA @ 400 V
Operating Temperature - Junction: Minimum -65°C, Maximum 150°C or higher
Capacitance @ Vr, F: 30 pF to 60 pF @ 4V, 1MHz

Substitute parts are grouped into two categories: Direct Manufacturer Equivalents (same manufacturer, same base specifications) and Cross-Manufacturer Alternatives (different manufacturers, equivalent electrical and mechanical specifications). All listed substitutes maintain DO-214AB (SMC) package compatibility and surface mount configuration.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	C @ Vr [pF]	Tj (Max) [°C]	Product Status	RoHS Status
RS3G-13	Diodes Incorporated	400	3	1.3 @ 3 A	150	5 @ 400 V	50 @ 4V, 1MHz	150	Discontinued	RoHS non-compliant
RS3G-13-F	Diodes Incorporated	400	3	1.3 @ 3 A	150	5 @ 400 V	50 @ 4V, 1MHz	150	Active	ROHS3 Compliant
CURC304-G	Comchip Technology	400	3	1.3 @ 3 A	50	5 @ 400 V	—	150	Active	ROHS3 Compliant
ER3G-TP	Micro Commercial Co	400	3	1.25 @ 3 A	35	5 @ 400 V	45 @ 4V, 1MHz	175	Active	ROHS3 Compliant
ES3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.1 @ 3 A	50	10 @ 400 V	30 @ 4V, 1MHz	150	Active	ROHS3 Compliant
ES3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400	3	1.1 @ 3 A	50	10 @ 400 V	30 @ 4V, 1MHz	150	Active	ROHS3 Compliant
S3G	Diotec Semiconductor	400	3	1.15 @ 3 A	1500	5 @ 1700 V	—	150	Active	Not applicable
S3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.15 @ 2.5 A	2500	10 @ 400 V	60 @ 4V, 1MHz	150	Active	ROHS3 Compliant
S3G-TP	Micro Commercial Co	400	3	1.2 @ 3 A	—	10 @ 400 V	—	150	Not For New Designs	ROHS3 Compliant
STTH3R04S	STMicroelectronics	400	3	1.5 @ 3 A	35	5 @ 400 V	—	175	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: RS3G-13-F

The RS3G-13-F is the direct equivalent from Diodes Incorporated, the original manufacturer of the RS3G-13. This part maintains identical electrical specifications and mechanical packaging while offering active product status and ROHS3 compliance. The RS3G-13-F is available in Cut Tape (CT) and Digi-Reel® packaging with 29,100 units in stock, providing supply continuity for production environments.

Secondary Recommendations for Fast Recovery Applications:

For applications requiring improved reverse recovery time performance, the following active parts provide superior switching characteristics:

CURC304-G (Comchip Technology): Reduces reverse recovery time to 50 ns while maintaining all voltage and current ratings. ROHS3 compliant. Tape & Reel packaging with 3,896 units in stock.
ER3G-TP (Micro Commercial Co): Achieves 35 ns reverse recovery time with extended maximum junction temperature of 175°C. ROHS3 compliant. Tape & Reel packaging with 42,810 units in stock.
STTH3R04S (STMicroelectronics): Delivers 35 ns reverse recovery time with maximum junction temperature of 175°C. ROHS3 compliant. Cut Tape & Digi-Reel® packaging with 16,898 units in stock.

Vishay General Semiconductor Options:

The ES3G-E3/57T and ES3G-E3/9AT (Vishay) provide fast recovery performance (50 ns) with lower forward voltage (1.1 V @ 3 A) compared to the original RS3G-13. Both are ROHS3 compliant and available in high quantities (80,850 and 287,100 units respectively). The ES3G-E3/9AT is supplied in Tape & Reel format, suitable for automated assembly.

Not Recommended for New Designs:

The S3G-TP (Micro Commercial Co) carries a "Not For New Designs" status and should not be selected for new applications despite ROHS3 compliance.

Standard Recovery Alternative:

The S3G and S3G-E3/57T (Diotec and Vishay respectively) employ standard recovery technology with significantly longer reverse recovery times (1.5 µs and 2.5 µs). These parts are suitable only for applications where fast recovery performance is not required.

Frequently Asked Questions (FAQ)

Q: Can the RS3G-13 be directly replaced with RS3G-13-F?

A: Yes. The RS3G-13-F is the direct equivalent from the same manufacturer with identical electrical specifications and mechanical packaging. The primary differences are active product status and ROHS3 compliance certification. No design changes are required.

Q: What is the difference between fast recovery and standard recovery diodes in this product category?

A: Fast recovery diodes (RS3G-13, RS3G-13-F, CURC304-G, ER3G-TP, ES3G-E3/57T, ES3G-E3/9AT, STTH3R04S) have reverse recovery times ≤ 500 ns and are suitable for high-frequency switching applications. Standard recovery diodes (S3G, S3G-E3/57T) have reverse recovery times > 500 ns and are limited to lower-frequency applications. The RS3G-13 is a fast recovery device; substitutes must maintain this classification unless application requirements explicitly permit standard recovery operation.

Q: Are all substitute parts available in the same package as the RS3G-13?

A: Yes. All listed substitute parts use the DO-214AB (SMC) surface mount package, ensuring mechanical and footprint compatibility. However, packaging formats differ: some are supplied in Cut Tape (CT) & Digi-Reel®, while others are supplied in Tape & Reel (TR). Verify packaging format compatibility with your procurement and assembly processes.

Q: What is the significance of RoHS compliance for the RS3G-13 substitutes?

A: The original RS3G-13 is RoHS non-compliant. All recommended substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components. This compliance is mandatory for many applications and markets. The S3G (Diotec) carries "Not applicable" RoHS status and should not be used in RoHS-regulated applications.

Q: Can I use STTH3R04S or ER3G-TP in place of RS3G-13 if my application operates at elevated temperatures?

A: Yes, if your application requires operation above 150°C. Both STTH3R04S and ER3G-TP support maximum junction temperatures of 175°C, compared to 150°C for the RS3G-13. All other electrical specifications remain equivalent. Verify that your thermal management design can accommodate the higher power dissipation characteristics of these alternatives.

Q: What is the difference between ES3G-E3/57T and ES3G-E3/9AT?

A: Both parts are electrically identical with 400 V, 3 A ratings and 50 ns reverse recovery time. The primary difference is packaging format: ES3G-E3/57T is supplied in Cut Tape (CT) with 80,850 units in stock, while ES3G-E3/9AT is supplied in Tape & Reel (TR) with 287,100 units in stock. Select based on your assembly equipment and procurement requirements.

Q: Why is the forward voltage specification different across substitute parts?

A: Forward voltage (Vf) varies slightly between manufacturers due to differences in semiconductor processing and junction design, even when voltage and current ratings are identical. The RS3G-13 specifies 1.3 V @ 3 A, while alternatives range from 1.1 V to 1.5 V @ 3 A. All values remain within acceptable operating ranges for 400 V, 3 A rectifier applications. If your circuit design is sensitive to forward voltage drop, select parts with Vf specifications closest to your original design.

Q: Should I use CURC304-G if my application requires the fastest possible switching?

A: CURC304-G offers 50 ns reverse recovery time, which is faster than the original RS3G-13 (150 ns) and equivalent to ER3G-TP and STTH3R04S. However, CURC304-G does not specify capacitance at rated voltage, while ER3G-TP and STTH3R04S provide more complete parametric data. If switching speed is the primary criterion, CURC304-G, ER3G-TP, and STTH3R04S are equivalent choices. Verify capacitance specifications with the manufacturer if your circuit design requires this parameter.

Q: Is the S3G suitable as a substitute for the RS3G-13?

A: No. While the S3G maintains 400 V, 3 A ratings and DO-214AB packaging, it employs standard recovery technology with 1.5 µs reverse recovery time, compared to 150 ns for the RS3G-13. This 10-fold increase in recovery time makes the S3G unsuitable for applications designed around the fast recovery characteristics of the RS3G-13. Use the S3G only if your application explicitly permits standard recovery operation.

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