S3J R7G Equivalent & Substitute Parts

Part Overview

The S3J R7G is a general-purpose rectifier diode rated for 600 V DC reverse voltage and 3 A average rectified current, packaged in the DO-214AB (SMC) surface mount configuration. Manufactured by Taiwan Semiconductor Corporation, this part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating different packaging formats and manufacturer sourcing options.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 600 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts are grouped based on strict electrical and mechanical compatibility criteria. All substitute parts maintain the following core specifications:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 3 A
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Grouping Categories:

Group 1: DO-214AB (SMC) Package - Fast Recovery Technology Parts RS3J-E3/57T, RS3J-E3/9AT, RS3J-M3/57T, and RS3J-M3/9AT maintain the identical DO-214AB package footprint with fast recovery characteristics (≤ 500ns). These parts are manufactured by Vishay General Semiconductor and feature reverse recovery time specifications of 250 ns, representing enhanced switching performance compared to the original part.

Group 2: DO-214AB (SMC) Package - Standard Recovery Technology Parts S3J-E3/57T, S3J-E3/9AT, and S3J-TP maintain the identical DO-214AB package footprint with standard recovery characteristics (>500ns). These parts are manufactured by Vishay General Semiconductor and Micro Commercial Co, featuring reverse recovery times of 2.5 µs and forward voltage specifications matching the original part at 1.15 V @ 2.5 A or 1.2 V @ 3 A.

Group 3: DO-214AA (SMB) Package Parts RS3JB-13-F and S3JB-13-F utilize the larger DO-214AA (SMB) surface mount package. These parts are manufactured by Diodes Incorporated and provide equivalent electrical performance with different thermal and mechanical characteristics due to package geometry.

Group 4: DO-214AB (SMC) Package - Diodes Incorporated Part S3J-13-F is manufactured by Diodes Incorporated in the DO-214AB (SMC) package with standard recovery characteristics, providing direct form-fit-function compatibility with the original part.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Speed	Trr [ns]	Package	Status
S3J R7G	Taiwan Semiconductor Corporation	600	3	1.15 @ 3A	Fast Recovery ≤ 500ns	—	DO-214AB (SMC)	Discontinued
RS3J-E3/57T	Vishay General Semiconductor	600	3	1.3 @ 2.5A	Fast Recovery ≤ 500ns	250	DO-214AB (SMC)	Active
RS3J-E3/9AT	Vishay General Semiconductor	600	3	1.3 @ 2.5A	Fast Recovery ≤ 500ns	250	DO-214AB (SMC)	Active
RS3J-M3/57T	Vishay General Semiconductor	600	3	1.3 @ 2.5A	Fast Recovery ≤ 500ns	250	DO-214AB (SMC)	Active
RS3J-M3/9AT	Vishay General Semiconductor	600	3	1.3 @ 2.5A	Fast Recovery ≤ 500ns	250	DO-214AB (SMC)	Active
RS3JB-13-F	Diodes Incorporated	600	3	1.3 @ 3A	Fast Recovery ≤ 500ns	250	DO-214AA (SMB)	Active
S3J-13-F	Diodes Incorporated	600	3	1.15 @ 3A	Standard Recovery >500ns	—	DO-214AB (SMC)	Active
S3J-E3/57T	Vishay General Semiconductor	600	3	1.15 @ 2.5A	Standard Recovery >500ns	2500	DO-214AB (SMC)	Active
S3J-E3/9AT	Vishay General Semiconductor	600	3	1.15 @ 2.5A	Standard Recovery >500ns	2500	DO-214AB (SMC)	Active
S3J-TP	Micro Commercial Co	600	3	1.2 @ 3A	Standard Recovery >500ns	—	DO-214AB (SMC)	Active
S3JB-13-F	Diodes Incorporated	600	3	1.15 @ 3A	Standard Recovery >500ns	—	DO-214AA (SMB)	Active

Engineering Selection Recommendations

For Direct Form-Fit-Function Replacement (DO-214AB SMC Package):

S3J-13-F (Diodes Incorporated) provides the most direct replacement for the S3J R7G. Both parts share identical forward voltage specifications (1.15 V @ 3 A), matching package geometry (DO-214AB SMC), and standard recovery characteristics. This part is in active production with high inventory availability (101,011 pcs).

S3J-E3/57T or S3J-E3/9AT (Vishay General Semiconductor) offer equivalent performance with standard recovery technology and identical package footprint. These parts feature slightly lower forward voltage at the specified test current (1.15 V @ 2.5 A) and are available in high quantities.

S3J-TP (Micro Commercial Co) provides an alternative source with standard recovery characteristics and forward voltage of 1.2 V @ 3 A, maintaining full compatibility with the original part specifications.

For Enhanced Switching Performance (Fast Recovery, DO-214AB SMC Package):

RS3J-E3/57T, RS3J-E3/9AT, RS3J-M3/57T, or RS3J-M3/9AT (Vishay General Semiconductor) are suitable when fast recovery characteristics (≤ 500ns, 250 ns typical) are required. These parts maintain the DO-214AB package footprint and 600 V / 3 A ratings. Forward voltage is specified at 1.3 V @ 2.5 A, representing a 0.15 V increase compared to the original part. These substitutes are appropriate for applications where switching speed is critical.

For Larger Package Format (DO-214AA SMB Package):

RS3JB-13-F or S3JB-13-F (Diodes Incorporated) provide equivalent electrical performance in the larger DO-214AA (SMB) package. These parts are suitable for applications where increased thermal dissipation or different PCB layout requirements necessitate the larger package format. Both parts are in active production with substantial inventory.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and REACH unaffected status, matching the original part's regulatory profile. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can RS3J-E3/57T replace S3J R7G in all applications?

A: RS3J-E3/57T maintains identical voltage and current ratings (600 V, 3 A) and uses the same DO-214AB package. The primary difference is fast recovery technology (250 ns) versus the original part's fast recovery specification. Forward voltage is 1.3 V @ 2.5 A compared to 1.15 V @ 3 A in the original. This substitution is valid for applications where fast recovery characteristics are acceptable or beneficial. Verify forward voltage drop requirements in your specific circuit.

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

A: Both are surface mount packages for rectifier diodes. DO-214AB (SMC) is the smaller package used in the original S3J R7G. DO-214AA (SMB) is a larger package offering increased thermal dissipation capability. PCB footprints differ, requiring layout modifications if substituting between these package types. Electrical performance remains equivalent.

Q: Why do some substitute parts specify forward voltage at different current levels?

A: Forward voltage varies with current. The original S3J R7G specifies 1.15 V @ 3 A. Some substitutes specify 1.3 V @ 2.5 A or 1.2 V @ 3 A. These represent the manufacturer's test conditions. For circuit design purposes, use the forward voltage specification at your actual operating current. Differences of 0.05 to 0.15 V are typical across different manufacturers and do not prevent functional substitution.

Q: Are fast recovery and standard recovery diodes interchangeable?

A: Fast recovery diodes (≤ 500ns) and standard recovery diodes (>500ns) are electrically interchangeable in most applications. Fast recovery diodes exhibit lower reverse recovery time, reducing switching losses and electromagnetic interference. Standard recovery diodes are suitable for lower-frequency applications. Substituting a fast recovery part for a standard recovery part generally improves performance. Reverse substitution may reduce performance in high-frequency switching applications.

Q: What inventory considerations apply when selecting a substitute?

A: S3J-13-F (Diodes Incorporated) offers the highest inventory availability at 101,011 pcs, followed by S3J-TP (Micro Commercial Co) at 39,720 pcs and S3JB-13-F (Diodes Incorporated) at 78,400 pcs. All listed substitutes are in active production. Inventory levels support both prototype and production-volume requirements.

Q: Do all substitute parts meet the same temperature range as the original?

A: The original S3J R7G operates from -55°C to 150°C. Most substitutes maintain this range. RS3JB-13-F and S3JB-13-F (Diodes Incorporated) extend the lower operating limit to -65°C. This extended range does not prevent substitution; it represents an additional capability. Verify your application's temperature requirements against the selected substitute's operating range.

Q: Can I use S3JB-13-F (SMB package) as a direct replacement for S3J R7G (SMC package)?

A: S3JB-13-F provides equivalent electrical performance but requires PCB layout modification due to different package footprints. The SMB package is larger than SMC, affecting board space and thermal characteristics. This substitution is valid when PCB redesign is acceptable and the larger package provides thermal or mechanical advantages.

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