S4A V7G Equivalent & Substitute Parts

Part Overview

The S4A V7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 4 A average rectified current in a surface mount DO-214AB (SMC) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The S4A V7G operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 and REACH standards. Standard recovery characteristics and a reverse recovery time of 1.5 µs define its performance profile for general rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 4 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Capacitance @ Vr, F	60	pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S4A V7G is determined by the following critical parameters:

Voltage Rating (Vr): Must equal or exceed 50 V DC reverse voltage
Current Rating (Io): Must equal or exceed 4 A average rectified current
Package Type: Must be DO-214AB (SMC) surface mount
Operating Temperature Range: Must support -55°C to 150°C junction temperature
Compliance: Must maintain RoHS3 and REACH compliance status

Two substitute categories are identified:

Direct Equivalent: S4A (Taiwan Semiconductor Corporation) — identical electrical specifications and packaging, differing only in supply format (Tape & Reel vs. bulk).

Functional Substitutes: Parts meeting or exceeding the voltage and current requirements within the same package type. These include the S5AHE3_A/H (5 A rating, higher current capacity) and ES3AHE3_A/I (3 A rating, lower current capacity with faster recovery characteristics).

Parameter Comparison

Parameter	S4A V7G (Main)	S4A (Direct)	S5AHE3_A/H	ES3AHE3_A/I
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	4 A	4 A	5 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 4 A	1.15 V @ 4 A	1.15 V @ 5 A	900 mV @ 3 A
Reverse Recovery Time (trr)	1.5 µs	1.5 µs	2.5 µs	30 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V
Capacitance @ Vr, F	60 pF @ 4V, 1MHz	60 pF @ 4V, 1MHz	40 pF @ 4V, 1MHz	45 pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

S4A (Direct Equivalent): This part is the primary substitute for the discontinued S4A V7G. It provides identical electrical performance and packaging specifications. The S4A is currently in active product status with 781 pieces in stock. Selection of this part eliminates any performance variation and is suitable for direct replacement in existing designs.

S5AHE3_A/H (Higher Current Rating): This Vishay part provides 5 A average rectified current, exceeding the 4 A requirement of the original S4A V7G. It maintains the 50 V voltage rating, identical forward voltage characteristics at its rated current, and the same DO-214AB package. The S5AHE3_A/H carries AEC-Q101 automotive qualification and is active in production with 1072 pieces in stock. This part is suitable for applications requiring additional current margin or where automotive-grade reliability is specified.

ES3AHE3_A/I (Lower Current Rating): This Vishay part provides 3 A average rectified current, below the 4 A requirement of the original S4A V7G. It maintains the 50 V voltage rating and DO-214AB package. The ES3AHE3_A/I features fast recovery characteristics (30 ns reverse recovery time) and carries AEC-Q101 automotive qualification. This part is suitable only for applications where the actual circuit current requirement does not exceed 3 A, and where the faster recovery time provides circuit performance benefits.

All three substitute options maintain RoHS3 compliance and the required operating temperature range of -55°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can the S4A be used as a direct replacement for the S4A V7G?

A: Yes. The S4A provides identical electrical specifications and packaging. The only difference is the supply format (Tape & Reel packaging versus the original bulk format). Both parts are rated for 50 V, 4 A, with 1.15 V forward voltage and 1.5 µs reverse recovery time.

Q: What is the difference between the S5AHE3_A/H and the original S4A V7G?

A: The S5AHE3_A/H is rated for 5 A average rectified current compared to the 4 A rating of the S4A V7G. All other electrical parameters remain equivalent: 50 V voltage rating, 1.15 V forward voltage, and identical operating temperature range. The S5AHE3_A/H includes AEC-Q101 automotive qualification. This part can be used in applications where the original 4 A rating is insufficient or where automotive-grade components are required.

Q: Can the ES3AHE3_A/I replace the S4A V7G?

A: The ES3AHE3_A/I is rated for 3 A average rectified current, which is below the 4 A specification of the S4A V7G. This part is suitable only for circuits where the actual operating current does not exceed 3 A. The ES3AHE3_A/I offers faster recovery characteristics (30 ns versus 1.5 µs) and AEC-Q101 automotive qualification. Verify circuit current requirements before selecting this part.

Q: Are all substitute parts available in the same DO-214AB package?

A: Yes. The S4A, S5AHE3_A/H, and ES3AHE3_A/I are all supplied in the DO-214AB (SMC) surface mount package. No PCB layout modifications are required for substitution.

Q: Do the substitute parts maintain RoHS3 compliance?

A: Yes. The S4A, S5AHE3_A/H, and ES3AHE3_A/I are all RoHS3 compliant and REACH unaffected, matching the compliance status of the original S4A V7G.

Q: What is the operating temperature range for the substitute parts?

A: All substitute parts operate across the same junction temperature range as the original S4A V7G: -55°C to 150°C.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring 4 A rectification at 50 V, the S4A is the direct equivalent. For applications requiring higher current capacity, the S5AHE3_A/H (5 A) is suitable. For applications with lower current requirements (≤3 A) where faster recovery is beneficial, the ES3AHE3_A/I is an option. All three parts are in active production status.

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