RS3G-M3/9AT Equivalent & Substitute Parts

Part Overview

The RS3G-M3/9AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount device operates at 400 V DC reverse voltage with a 3 A average rectified current rating and is packaged in the DO-214AB (SMC) form factor. The device is classified as a fast recovery rectifier with a reverse recovery time of 150 ns and is currently in active product status with 924 units in stock.

Substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when sourcing from multiple manufacturers is required for supply chain resilience. The parts listed below maintain electrical and mechanical compatibility with the RS3G-M3/9AT within the specified parameter ranges.

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 V @ 2.5 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the RS3G-M3/9AT is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

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

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Specified at different current levels (2.5 A or 3 A) but maximum value 1.3 V
Reverse Recovery Time (trr): Range 35 ns to 150 ns (all within fast recovery specification)
Current - Reverse Leakage @ Vr: Range 1 µA to 10 µA @ 400 V
Capacitance @ Vr, F: Range 30 pF to 80 pF @ 4V, 1MHz
Packaging Format: Tape & Reel (TR) or Cut Tape (CT) both acceptable for surface mount assembly

All substitute parts listed maintain the same electrical performance class and mechanical compatibility. Differences in reverse recovery time, leakage current, and capacitance fall within acceptable ranges for general-purpose rectification applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	C @ Vr [pF]	Package	Status
RS3G-M3/9AT	Vishay	400	3	1.3 @ 2.5A	150	10 @ 400V	44 @ 4V	DO-214AB	Active
RS3G-E3/57T	Vishay	400	3	1.3 @ 2.5A	150	10 @ 400V	44 @ 4V	DO-214AB	Active
RS3G-E3/9AT	Vishay	400	3	1.3 @ 2.5A	150	10 @ 400V	44 @ 4V	DO-214AB	Active
ES3G V7G	Taiwan Semiconductor	400	3	1.3 @ 3A	35	10 @ 400V	30 @ 4V	DO-214AB	Discontinued
HS3G R7G	Taiwan Semiconductor	400	3	1.3 @ 3A	50	10 @ 400V	80 @ 4V	DO-214AB	Discontinued
HS3G V7G	Taiwan Semiconductor	400	3	1.3 @ 3A	50	10 @ 400V	80 @ 4V	DO-214AB	Discontinued
UF3G_R1_00001	Panjit International	400	3	1.3 @ 3A	50	1 @ 400V	75 @ 4V	DO-214AB	Active

Engineering Selection Recommendations

Primary Selection (Active Status):

The RS3G-E3/57T and RS3G-E3/9AT are direct parametric equivalents to the RS3G-M3/9AT, all manufactured by Vishay General Semiconductor - Diodes Division. These parts maintain identical electrical specifications and are currently in active product status. Selection between these three Vishay variants should be based on packaging format availability (Tape & Reel) and inventory requirements. All three parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating.

The UF3G_R1_00001 manufactured by Panjit International Inc. is an active alternative that meets all mandatory electrical and mechanical parameters. This part features lower reverse leakage current (1 µA versus 10 µA) and is suitable for applications where leakage performance is a design consideration. The UF3G_R1_00001 is ROHS3 compliant and carries MSL 1 rating.

Secondary Selection (Discontinued Status):

The ES3G V7G, HS3G R7G, and HS3G V7G manufactured by Taiwan Semiconductor Corporation are parametrically equivalent but carry discontinued status at DiGi Electronics. These parts maintain the required 400 V / 3 A ratings and DO-214AB packaging. The ES3G V7G offers faster reverse recovery time (35 ns) and lower capacitance (30 pF), while the HS3G variants provide higher capacitance (80 pF) and moderate reverse recovery time (50 ns). These parts are suitable for applications where existing inventory is available or where specific performance characteristics (recovery time, capacitance) align with circuit requirements.

All substitute parts listed are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity classification, matching the compliance profile of the primary part.

Frequently Asked Questions (FAQ)

Q: Can RS3G-E3/57T and RS3G-E3/9AT be used interchangeably with RS3G-M3/9AT?

A: Yes. These three Vishay parts are parametrically identical across all critical electrical specifications (400 V reverse voltage, 3 A average rectified current, 1.3 V forward voltage, 150 ns reverse recovery time, 10 µA reverse leakage). The difference lies in packaging format designation (M3/9AT, E3/57T, E3/9AT refer to tape reel configurations). All three are in active product status and carry identical compliance certifications.

Q: What is the difference between the Vishay RS3G variants and the Panjit UF3G_R1_00001?

A: The UF3G_R1_00001 maintains equivalent voltage and current ratings and identical package form factor (DO-214AB SMC). The primary difference is reverse leakage current: UF3G_R1_00001 specifies 1 µA @ 400 V compared to 10 µA for the Vishay parts. Reverse recovery time is 50 ns (faster than RS3G-M3/9AT at 150 ns). The UF3G_R1_00001 is currently in active product status.

Q: Why are the Taiwan Semiconductor parts (ES3G V7G, HS3G R7G, HS3G V7G) listed as discontinued?

A: These parts are marked as discontinued at DiGi Electronics, indicating they are no longer actively distributed through this channel. However, they remain parametrically equivalent to the RS3G-M3/9AT and may be available through alternative distribution channels or existing inventory. These parts should be considered only when primary active alternatives are unavailable.

Q: Are there packaging format differences between substitute parts?

A: Yes. The RS3G-M3/9AT, RS3G-E3/57T, and RS3G-E3/9AT are supplied in Tape & Reel (TR) format. The ES3G V7G and HS3G variants are supplied in Cut Tape (CT) format. The HS3G V7G packaging format is not specified. All parts use the same DO-214AB (SMC) mechanical package and are compatible with surface mount assembly equipment. Format selection depends on assembly line requirements and volume.

Q: Can I substitute a part with lower reverse recovery time (trr)?

A: Yes. The ES3G V7G with 35 ns reverse recovery time and UF3G_R1_00001 with 50 ns are faster than the RS3G-M3/9AT at 150 ns. Faster recovery time is generally beneficial in rectification circuits and does not create compatibility issues. The application circuit will function correctly with improved switching performance.

Q: What is the significance of capacitance variation (30 pF to 80 pF) among substitute parts?

A: Capacitance variation reflects differences in junction design between manufacturers. The ES3G V7G specifies 30 pF (lowest), while HS3G variants specify 80 pF (highest). The RS3G-M3/9AT specifies 44 pF. In general-purpose rectification applications, this variation does not affect basic diode function. Applications with specific frequency response or switching requirements should verify capacitance specifications against circuit design parameters.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance and REACH unaffected status, matching the compliance profile of the RS3G-M3/9AT. All parts carry MSL 1 (Unlimited) moisture sensitivity level, indicating no special moisture protection requirements during storage or handling.

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