S3G-M3/9AT Equivalent & Substitute Parts

Part Overview

The S3G-M3/9AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 400 V DC reverse voltage with 3 A average rectified current in a DO-214AB (SMC) package. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set. Alternative part numbers may be required due to packaging format availability, inventory levels, or application-specific qualifications such as automotive grade certifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 2.5	V @ A
Reverse Recovery Time (trr)	2.5	µs
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Capacitance @ Vr, F	60	pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the S3G-M3/9AT are qualified based on the following criteria:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AB, SMC
Operating Temperature - Junction: -55°C to 150°C
Mounting Type: Surface Mount

Acceptable Variations:

Packaging format (Tape & Reel vs. Cut Tape) does not affect electrical equivalence
Forward voltage (Vf) within standard tolerance ranges for this device class
Reverse leakage current within acceptable limits for general-purpose rectifier applications
Automotive grade qualification (AEC-Q101) represents an enhanced version suitable for automotive applications

Substitution Logic: All identified substitute parts maintain the core electrical specifications (400 V, 3 A, DO-214AB package) and temperature range. Differences in packaging format (TR vs. CT) and automotive qualification do not prevent functional substitution in applications where the original part is specified.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Ir @ Vr	Packaging	Grade	Qualification
S3G-M3/9AT	Vishay	400 V	3 A	1.15 V @ 2.5 A	2.5 µs	10 µA @ 400 V	Tape & Reel (TR)	Standard	—
S3G-E3/57T	Vishay	400 V	3 A	1.15 V @ 2.5 A	2.5 µs	10 µA @ 400 V	Cut Tape (CT)	Standard	—
S3G-E3/9AT	Vishay	400 V	3 A	1.15 V @ 2.5 A	2.5 µs	10 µA @ 400 V	Tape & Reel (TR)	Standard	—
S3GHE3_A/H	Vishay	400 V	3 A	1.15 V @ 2.5 A	2.5 µs	10 µA @ 400 V	Cut Tape (CT)	Automotive	AEC-Q101
S3GHE3_A/I	Vishay	400 V	3 A	1.15 V @ 2.5 A	2.5 µs	10 µA @ 400 V	Cut Tape (CT)	Automotive	AEC-Q101
ACGRC304-HF	Comchip Technology	400 V	3 A	1.15 V @ 3 A	>500ns, >200mA	5 µA @ 400 V	Tape & Reel (TR)	Automotive	AEC-Q101

Engineering Selection Recommendations

Standard Grade Applications: S3G-E3/9AT and S3G-E3/57T are direct electrical equivalents to the S3G-M3/9AT. Selection between these parts depends on packaging format requirements. S3G-E3/9AT maintains Tape & Reel packaging identical to the main part. S3G-E3/57T provides Cut Tape packaging for applications requiring alternative handling or reel configurations.

Automotive Grade Applications: S3GHE3_A/H and S3GHE3_A/I are AEC-Q101 qualified automotive-grade variants manufactured by Vishay. These parts maintain identical electrical specifications and are suitable for applications requiring automotive qualification. Both are supplied in Cut Tape packaging.

Cross-Manufacturer Alternative: ACGRC304-HF from Comchip Technology provides equivalent 400 V, 3 A performance with AEC-Q101 automotive qualification. This part is supplied in Tape & Reel packaging. Forward voltage is specified at 3 A rather than 2.5 A, and reverse leakage is lower at 5 µA. These variations remain within acceptable limits for general-purpose rectifier applications.

Product Status: All identified substitute parts maintain Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can S3G-E3/57T replace S3G-M3/9AT in production?

A: Yes. Both parts share identical electrical specifications (400 V, 3 A, 1.15 V forward voltage, 2.5 µs recovery time). The difference is packaging format: S3G-M3/9AT is supplied in Tape & Reel (TR) while S3G-E3/57T is supplied in Cut Tape (CT). Electrical performance and mechanical compatibility in DO-214AB packages are equivalent.

Q: What is the difference between standard grade and automotive grade versions?

A: Standard grade parts (S3G-M3/9AT, S3G-E3/9AT, S3G-E3/57T) and automotive grade parts (S3GHE3_A/H, S3GHE3_A/I, ACGRC304-HF) maintain identical electrical specifications. Automotive grade parts carry AEC-Q101 qualification, indicating compliance with automotive industry reliability and testing standards. Selection depends on application requirements.

Q: Is ACGRC304-HF from Comchip Technology fully compatible with Vishay S3G parts?

A: ACGRC304-HF meets the core electrical requirements: 400 V reverse voltage, 3 A average rectified current, DO-214AB package, and -55°C to 150°C operating range. Forward voltage is specified at 3 A (versus 2.5 A for Vishay parts) and reverse leakage is 5 µA (lower than 10 µA for Vishay parts). These variations are within acceptable tolerances for general-purpose rectifier applications.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect electrical performance?

A: No. Packaging format affects handling, storage, and assembly processes but does not alter electrical characteristics. Both Tape & Reel and Cut Tape formats contain identical diode components in DO-214AB packages.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance status and unlimited moisture sensitivity rating (MSL 1).

Q: Can I use S3GHE3_A/H or S3GHE3_A/I in non-automotive applications?

A: Yes. Automotive-grade parts exceed the requirements of standard applications. AEC-Q101 qualification represents enhanced reliability testing and does not restrict use in non-automotive circuits. These parts are electrically and mechanically compatible with standard-grade applications.

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