S4M R7 Equivalent & Substitute Parts

Part Overview

The S4M R7 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 4 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 alternatives for ongoing production and maintenance applications. The S4M R7 serves in power supply circuits, voltage regulation, and general rectification applications where standard recovery characteristics and moderate current handling are required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 4 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	10	µA @ 1000 V
Capacitance @ Vr, F	60	pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S4M R7 is determined by strict equivalence across the following critical parameters:

Voltage Rating: DC reverse voltage must equal 1000 V maximum
Current Rating: Average rectified current must equal 4 A
Forward Voltage Drop: Maximum forward voltage at rated current must equal 1.15 V @ 4 A
Recovery Characteristics: Reverse recovery time must equal 1.5 µs; standard recovery speed classification (>500 ns, >200 mA)
Leakage Current: Reverse leakage current must equal 10 µA @ 1000 V
Package: Surface mount DO-214AB (SMC) package required
Compliance: RoHS3 compliance and REACH unaffected status required

The S4M (without R7 suffix) from Taiwan Semiconductor Corporation meets all these criteria and is classified as an active product with equivalent electrical and mechanical specifications.

Parameter Comparison

Parameter	S4M R7 (Main Part)	S4M (Substitute)	Match
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Yes
Category	Diodes, Rectifiers	Diodes, Rectifiers	Yes
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	Yes
Current - Average Rectified (Io)	4 A	4 A	Yes
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 4 A	1.15 V @ 4 A	Yes
Reverse Recovery Time (trr)	1.5 µs	1.5 µs	Yes
Current - Reverse Leakage @ Vr	10 µA @ 1000 V	10 µA @ 1000 V	Yes
Capacitance @ Vr, F	60 pF @ 4V, 1MHz	60 pF @ 4V, 1MHz	Yes
Package / Case	DO-214AB, SMC	DO-214AB, SMC	Yes
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	Yes
Technology	Standard	Standard	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
REACH Status	REACH Unaffected	REACH Unaffected	Yes
Product Status	Discontinued at DiGi Electronics	Active	Substitute Available

Engineering Selection Recommendations

The S4M (Tape & Reel packaging) is a direct parametric equivalent to the S4M R7 and is suitable for replacement in all applications where the discontinued part was specified. The substitute part maintains identical electrical characteristics across all critical parameters: voltage rating, current capacity, forward voltage drop, recovery time, leakage current, and capacitance.

The S4M is currently in active production status with 13,780 pieces in stock, compared to the S4M R7 which is discontinued. Both parts carry ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and production continuity.

The primary distinction between the two parts is packaging format: the S4M R7 was supplied in cut tape or tube format, while the S4M is supplied in Tape & Reel (TR) format. This packaging difference does not affect electrical performance or mechanical compatibility in surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the S4M directly replace the S4M R7 in existing designs?

A: Yes. The S4M is a parametric equivalent with identical electrical specifications across all rated parameters. Both parts are manufactured by Taiwan Semiconductor Corporation and share the same DO-214AB (SMC) package footprint. No circuit modifications are required.

Q: What is the difference between S4M R7 and S4M?

A: The S4M R7 and S4M are electrically identical. The primary difference is packaging: S4M R7 was supplied in cut tape or tube format, while S4M is supplied in Tape & Reel (TR) format. The R7 designation indicates the original packaging configuration. Both parts have identical electrical performance and mechanical compatibility.

Q: Are there any compliance or certification differences?

A: No. Both the S4M R7 and S4M carry ROHS3 compliance and REACH unaffected status. Both are classified under ECCN EAR99 and HTSUS 8541.10.0080. Regulatory requirements are identical.

Q: What is the operating temperature range?

A: Both parts operate across a junction temperature range of -55°C to 150°C, suitable for industrial and commercial applications.

Q: Why is the S4M R7 discontinued?

A: The S4M R7 is discontinued at DiGi Electronics. The S4M remains in active production and is the recommended source for ongoing procurement.

Q: Can the S4M be used in high-frequency switching applications?

A: The S4M is classified as a standard recovery diode with a reverse recovery time of 1.5 µs. This recovery characteristic is suitable for standard rectification applications. Applications requiring faster switching performance require evaluation of fast recovery or ultrafast recovery diode alternatives.

Q: What is the reverse leakage current specification?

A: The reverse leakage current is specified as 10 µA at the maximum rated reverse voltage of 1000 V. This parameter is identical for both the S4M R7 and S4M.

Q: Is the DO-214AB package suitable for automated assembly?

A: Yes. The DO-214AB (SMC) package is a standard surface mount package compatible with automated pick-and-place and reflow soldering processes. Both the S4M R7 and S4M use this package format.

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