S3G Equivalent & Substitute Parts Reference

Part Overview

The onsemi S3G is a 400V 3A surface mount rectifier diode in DO-214AB (SMC) package rated for standard recovery applications. This part carries a "Not For New Designs" product status, indicating it is obsolete or superseded. Identifying equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where existing inventory requires replacement or where new sourcing is required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	2.5	µs
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Package / Case	DO-214AB, SMC	-
Operating Temperature - Junction	-55°C ~ 150°C	°C
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the S3G are classified into three categories based on electrical and mechanical compatibility:

Direct Substitutes (Packaging Variant): Parts with identical electrical specifications but different packaging formats (Cut Tape vs. Tape & Reel). These maintain all critical parameters including voltage rating, current rating, forward voltage, and recovery characteristics.

Upgrade Substitutes (Enhanced Specifications): Parts with equal or superior electrical performance and active product status. These include CMR3-04 variants from Central Semiconductor Corp, which maintain 400V/3A ratings with identical forward voltage and reverse leakage specifications while offering extended operating temperature ranges (-65°C ~ 175°C vs. -55°C ~ 150°C) and active product status.

Similar Substitutes (Parameter Variations): Parts meeting the core voltage and current requirements but with variations in secondary parameters such as recovery speed, reverse recovery time, forward voltage tolerance, or reverse leakage current. These include ES3G-E3/57T (fast recovery, 50ns trr), RS3G-13-F (fast recovery, 150ns trr), S3G-13-F (standard recovery, extended temperature range), and STTH3R04S (fast recovery, 35ns trr).

Parametric Equivalents (Functional Match): Parts from alternative manufacturers with matching core specifications. S3G_R1_00001 from Panjit International Inc. provides identical voltage, current, and forward voltage characteristics with superior reverse leakage performance (1 µA vs. 5 µA).

Current Rating Variants: S5GC-13-F provides a higher current rating (5A vs. 3A) at the same 400V voltage rating for applications requiring increased current capacity.

Substitution eligibility is determined by:

Voltage - DC Reverse (Vr) (Max): Must equal 400V
Current - Average Rectified (Io): Must equal or exceed 3A
Package / Case: Must be DO-214AB, SMC
Mounting Type: Must be Surface Mount
RoHS Status: Must maintain ROHS3 Compliance

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	trr	Ir @ Vr	Temp Range	Product Status	Packaging
S3G	onsemi	400V	3A	1.2V @ 3A	Standard >500ns	2.5µs	5µA @ 400V	-55°C ~ 150°C	Not For New Designs	CT
S3G-TP	Micro Commercial Co	400V	3A	1.2V @ 3A	Standard >500ns	-	10µA @ 400V	-55°C ~ 150°C	Not For New Designs	TR
CMR3-04 BK PBFREE	Central Semiconductor Corp	400V	3A	1.2V @ 3A	Standard >500ns	-	5µA @ 400V	-65°C ~ 175°C	Active	Bulk
CMR3-04 TR13 PBFREE	Central Semiconductor Corp	400V	3A	1.2V @ 3A	Standard >500ns	-	5µA @ 400V	-65°C ~ 175°C	Active	TR
ES3G-E3/57T	Vishay General Semiconductor	400V	3A	1.1V @ 3A	Fast ≤500ns	50ns	10µA @ 400V	-55°C ~ 150°C	Active	CT
RS3G-13-F	Diodes Incorporated	400V	3A	1.3V @ 3A	Fast ≤500ns	150ns	5µA @ 400V	-65°C ~ 150°C	Active	CT
S3G-13-F	Diodes Incorporated	400V	3A	1.15V @ 3A	Standard >500ns	-	10µA @ 400V	-65°C ~ 150°C	Active	CT
S3G-E3/57T	Vishay General Semiconductor	400V	3A	1.15V @ 2.5A	Standard >500ns	2.5µs	10µA @ 400V	-55°C ~ 150°C	Active	CT
S5GC-13-F	Diodes Incorporated	400V	5A	1.15V @ 5A	Standard >500ns	-	10µA @ 400V	-65°C ~ 150°C	Active	TR
STTH3R04S	STMicroelectronics	400V	3A	1.5V @ 3A	Fast ≤500ns	35ns	5µA @ 400V	-55°C ~ 175°C	Active	CT
S3G_R1_00001	Panjit International Inc.	400V	3A	1.2V @ 3A	Standard >500ns	-	1µA @ 400V	-55°C ~ 150°C	Active	TR

Engineering Selection Recommendations

For Direct Replacement with Active Product Status: CMR3-04 TR13 PBFREE (Central Semiconductor Corp) and CMR3-04 BK PBFREE provide the most direct substitution path. Both maintain identical electrical specifications to the S3G while offering active product status and extended operating temperature range (-65°C ~ 175°C). CMR3-04 TR13 PBFREE is recommended for automated assembly due to Tape & Reel packaging, while CMR3-04 BK PBFREE is available in Bulk packaging.

For Packaging Format Flexibility: S3G-13-F (Diodes Incorporated) provides active product status with identical base specifications and extended temperature range (-65°C ~ 150°C). This part is available in Cut Tape & Digi-Reel packaging format.

For Fast Recovery Applications: ES3G-E3/57T (Vishay General Semiconductor) offers fast recovery characteristics (50ns trr) with slightly lower forward voltage (1.1V @ 3A) and active product status. This part is suitable for applications requiring reduced switching losses.

For Parametric Equivalence: S3G_R1_00001 (Panjit International Inc.) provides identical forward voltage and current specifications with superior reverse leakage performance (1µA vs. 5µA @ 400V) and active product status.

For Higher Current Requirements: S5GC-13-F (Diodes Incorporated) provides 5A current rating at the same 400V voltage rating with active product status and extended temperature range (-65°C ~ 150°C).

All recommended substitutes maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and REACH Unaffected status consistent with the original S3G specification.

Frequently Asked Questions (FAQ)

Q: Can S3G-TP be used as a direct replacement for S3G? A: S3G-TP from Micro Commercial Co maintains identical electrical specifications (400V, 3A, 1.2V forward voltage, standard recovery) and package type (DO-214AB, SMC). The primary difference is packaging format (Tape & Reel vs. Cut Tape) and higher reverse leakage current (10µA vs. 5µA @ 400V). Both parts carry "Not For New Designs" status. S3G-TP is functionally compatible for applications where reverse leakage tolerance permits.

Q: What is the difference between standard recovery and fast recovery diodes? A: Standard recovery diodes have reverse recovery times exceeding 500ns, while fast recovery diodes have reverse recovery times of 500ns or less. Fast recovery diodes reduce switching losses and are suitable for higher frequency applications. The S3G specifies standard recovery (2.5µs trr), while ES3G-E3/57T and STTH3R04S provide fast recovery (50ns and 35ns respectively).

Q: Why do some substitute parts have different forward voltage specifications? A: Forward voltage variation is a normal characteristic across different manufacturers and process technologies. The S3G specifies 1.2V @ 3A, while substitutes range from 1.1V to 1.5V @ 3A. These variations are within acceptable tolerance for rectifier applications and do not prevent functional substitution provided the application design accommodates the specified range.

Q: Is CMR3-04 TR13 PBFREE suitable for automated assembly? A: Yes. CMR3-04 TR13 PBFREE is supplied in Tape & Reel (TR) packaging format, which is standard for automated pick-and-place assembly equipment. This packaging format is compatible with standard SMT assembly processes.

Q: Can S5GC-13-F be used in place of S3G? A: S5GC-13-F provides 5A current rating compared to S3G's 3A rating at the same 400V voltage. This part is electrically compatible and can be used as a substitute. The higher current rating provides additional design margin for applications where current requirements are at or near the 3A specification. All other electrical parameters remain compatible.

Q: What is the significance of the extended temperature range in CMR3-04 variants? A: CMR3-04 variants specify -65°C ~ 175°C operating temperature range compared to S3G's -55°C ~ 150°C. The extended range provides design flexibility for applications operating at lower ambient temperatures or with higher thermal stress. This represents an upgrade in thermal capability without compromise to other electrical specifications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance status consistent with the original S3G specification. All parts also maintain MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status.

Q: What packaging options are available for substitutes? A: Substitute parts are available in multiple packaging formats: Cut Tape (CT), Tape & Reel (TR), and Bulk. Cut Tape and Tape & Reel formats are suitable for automated assembly. Bulk packaging is used for manual assembly or high-volume reel consolidation. Selection depends on assembly process requirements and inventory management practices.

Q: How does reverse leakage current affect part selection? A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias condition. The S3G specifies 5µA @ 400V. Substitutes range from 1µA to 10µA @ 400V. Lower reverse leakage (S3G_R1_00001 at 1µA) provides superior performance in high-impedance circuits. Higher reverse leakage (S3G-TP and S3G-13-F at 10µA) remains acceptable for most rectifier applications. Selection depends on circuit sensitivity to leakage current.

Q: What is the significance of capacitance specifications? A: Capacitance at reverse voltage (Cr) affects switching transients and high-frequency performance. The S3G specifies 60pF @ 4V, 1MHz. Substitutes range from 30pF to 60pF. Lower capacitance (ES3G-E3/57T at 30pF) reduces switching transients and is beneficial for high-frequency applications. This parameter is secondary to voltage and current ratings for standard rectifier applications.

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