HS3G R7G Equivalent & Substitute Parts

Part Overview

The HS3G R7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing production and maintenance applications. The diode features fast recovery characteristics with a reverse recovery time of 50 ns, making it suitable for switching power supply and rectification circuits requiring moderate current handling at 400 V operating levels.

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
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10 @ 400 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the HS3G R7G is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 3 A or lower
Reverse Recovery Time (trr): 50 ns or faster
Current - Reverse Leakage @ Vr: 10 µA @ 400 V or lower
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Parts are grouped into three categories:

Parametric Equivalents: Identical electrical ratings and package specifications with minor variations in reverse recovery time or capacitance that do not affect circuit performance.

Direct Manufacturer Equivalents: Parts from alternative manufacturers meeting all primary substitution criteria with identical or superior electrical characteristics.

Similar Parts: Components with identical voltage and current ratings but differing in recovery speed classification or current rating, suitable only for applications where the specific performance characteristic is not critical.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Speed	Package	Product Status
HS3G R7G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	50	10 @ 400 V	Fast Recovery ≤ 500ns	DO-214AB, SMC	Discontinued
ES3G V7G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	35	10 @ 400 V	Fast Recovery ≤ 500ns	DO-214AB, SMC	Discontinued
HS3G V7G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	50	10 @ 400 V	Fast Recovery ≤ 500ns	DO-214AB, SMC	Discontinued
HS3G-K M6G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	50	10 @ 400 V	Fast Recovery ≤ 500ns	DO-214AB, SMC	Active
S3G-TP	Micro Commercial Co	400	3	1.2 @ 3 A	—	10 @ 400 V	Standard Recovery >500ns	DO-214AB, SMC	Not For New Designs
CGRC504-G	Comchip Technology	400	5	1.15 @ 5 A	—	10 @ 400 V	Standard Recovery >500ns	DO-214AB, SMC	Active
CURC304-G	Comchip Technology	400	3	1.3 @ 3 A	50	5 @ 400 V	Fast Recovery ≤ 500ns	DO-214AB, SMC	Active
ES3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.1 @ 3 A	50	10 @ 400 V	Fast Recovery ≤ 500ns	DO-214AB, SMC	Active
ES3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400	3	1.1 @ 3 A	50	10 @ 400 V	Fast Recovery ≤ 500ns	DO-214AB, SMC	Active
MURS340S-E3/52T	Vishay General Semiconductor - Diodes Division	400	1.5	1.45 @ 3 A	75	5 @ 400 V	Fast Recovery ≤ 500ns	DO-214AB, SMC	Active
MURS340S-E3/5BT	Vishay General Semiconductor - Diodes Division	400	1.5	1.45 @ 3 A	75	5 @ 400 V	Fast Recovery ≤ 500ns	DO-214AB, SMC	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Parametric Equivalents):

The HS3G-K M6G is the preferred direct replacement for the HS3G R7G. This part maintains identical electrical specifications (400 V, 3 A, 50 ns reverse recovery time) and is currently in Active product status. The HS3G-K M6G is supplied in Tape & Reel (TR) packaging, providing superior handling characteristics for automated assembly compared to the original Cut Tape (CT) packaging.

The ES3G-E3/9AT and ES3G-E3/57T from Vishay General Semiconductor are functionally equivalent alternatives. Both parts meet the 400 V, 3 A, 50 ns fast recovery specification. The ES3G-E3/9AT is supplied in Tape & Reel format with significantly higher inventory availability (287,100 units), while ES3G-E3/57T is supplied in Cut Tape format. Both manufacturers' parts feature lower forward voltage (1.1 V vs. 1.3 V), resulting in reduced power dissipation. Both parts carry Active product status and ROHS3 compliance.

Secondary Substitutes (Acceptable with Application Review):

The CURC304-G from Comchip Technology meets all primary electrical criteria (400 V, 3 A, 50 ns recovery time, fast recovery classification) and is in Active product status. This part exhibits superior reverse leakage characteristics (5 µA vs. 10 µA), reducing standby power consumption. The maximum operating temperature is 150°C, matching the original specification.

Not Recommended for Direct Substitution:

The S3G-TP from Micro Commercial Co is classified as "Not For New Designs" and exhibits standard recovery characteristics (>500ns) rather than fast recovery, making it unsuitable for applications requiring the fast recovery performance of the original HS3G R7G.

The MURS340S-E3/52T and MURS340S-E3/5BT are rated for only 1.5 A average rectified current, insufficient for applications requiring the full 3 A capability of the HS3G R7G.

The CGRC504-G is rated for 5 A, exceeding the original specification and introducing unnecessary cost and thermal considerations for 3 A applications.

Frequently Asked Questions (FAQ)

Q: Can the HS3G-K M6G be used as a direct replacement for the HS3G R7G?

A: Yes. The HS3G-K M6G is a parametric equivalent with identical voltage (400 V), current (3 A), reverse recovery time (50 ns), and operating temperature range (-55°C to 150°C). The primary difference is packaging format: HS3G-K M6G is supplied in Tape & Reel (TR) while the original HS3G R7G is supplied in Cut Tape (CT). Both are surface mount DO-214AB packages suitable for identical PCB layouts.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Fast recovery diodes have reverse recovery times ≤ 500 ns and are optimized for switching applications where rapid turn-off is critical. Standard recovery diodes have reverse recovery times > 500 ns and are suitable for lower-frequency rectification. The HS3G R7G specifies fast recovery (50 ns), making it suitable for switching power supplies. Substitutes must maintain this fast recovery characteristic unless the application has been re-evaluated for standard recovery operation.

Q: Are ES3G-E3/9AT and ES3G-E3/57T interchangeable?

A: These parts are electrically identical but differ in packaging format. ES3G-E3/9AT is supplied in Tape & Reel (TR) format, while ES3G-E3/57T is supplied in Cut Tape (CT) format. Selection depends on assembly process requirements. Both meet the 400 V, 3 A, 50 ns specification and are in Active product status.

Q: Why do some substitute parts have lower forward voltage (1.1 V vs. 1.3 V)?

A: Forward voltage variation within the 400 V, 3 A, fast recovery classification reflects manufacturing process differences between suppliers. Lower forward voltage (1.1 V) results in reduced power dissipation during conduction. This is a beneficial characteristic and does not affect circuit compatibility. Circuits designed for 1.3 V forward voltage operate correctly with 1.1 V parts.

Q: Can the CURC304-G be used in place of the HS3G R7G?

A: Yes, for applications where the lower reverse leakage current (5 µA vs. 10 µA) is beneficial. The CURC304-G meets all primary electrical specifications: 400 V, 3 A, 50 ns reverse recovery time, fast recovery classification, and -55°C to 150°C operating temperature. The reduced reverse leakage may improve standby power characteristics in certain circuit topologies.

Q: What is the significance of the reverse leakage current specification?

A: Reverse leakage current (Ir) represents the small current flowing through the diode when reverse-biased. The HS3G R7G specifies 10 µA @ 400 V. Lower leakage current (such as 5 µA in the CURC304-G) reduces standby power consumption and heat generation in circuits with extended reverse-bias periods. Higher leakage does not affect forward conduction performance but increases standby power dissipation.

Q: Why is the MURS340S series not recommended as a substitute?

A: The MURS340S series is rated for only 1.5 A average rectified current, compared to the 3 A requirement of the HS3G R7G. Using an undersized diode results in excessive current density, reduced reliability, and potential thermal runaway. The MURS340S is suitable only for applications requiring ≤ 1.5 A at 400 V.

Q: What does "Active" product status mean compared to "Discontinued"?

A: Active status indicates the manufacturer continues production and supports the part for new designs. Discontinued status indicates the manufacturer no longer produces the part, though existing inventory may remain available. For long-term supply chain reliability, Active status parts are preferred for new designs and ongoing production.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the original HS3G R7G. This ensures compatibility with environmental regulations and customer requirements for lead-free manufacturing.

Q: Can packaging format (Cut Tape vs. Tape & Reel) affect circuit performance?

A: No. Packaging format affects only handling, storage, and assembly process compatibility. The electrical and thermal performance of the diode itself is independent of whether it is supplied in Cut Tape or Tape & Reel format. Selection should be based on assembly equipment capabilities and inventory management requirements.

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