Equivalent & Substitute Parts for S3D Diode

Part Overview

The S3D is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 200 V DC reverse voltage and 3 A average rectified current in a Surface Mount SMC (DO-214AB) package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The S3D operates across a junction temperature range of -65°C to 150°C and complies with ROHS3 and REACH standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15	V @ 3 A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	10	µA @ 200 V
Capacitance @ Vr, F	40	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S3D rectifier diode is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 200 V
Current - Average Rectified (Io) must equal or exceed 3 A
Mounting Type must be Surface Mount
Package / Case must be DO-214AB, SMC
Operating Temperature - Junction range must accommodate -65°C to 150°C

Secondary Compatibility Factors:

Forward voltage (Vf) characteristics
Recovery speed classification
Reverse leakage current specifications
RoHS and REACH compliance status

Substitute parts are grouped into two categories: direct equivalents (identical voltage and current ratings) and higher-rated alternatives (elevated voltage ratings with compatible current specifications). All substitute parts maintain the same SMC package footprint and surface mount configuration, ensuring mechanical and electrical compatibility within the specified parameter envelope.

Parameter Comparison

Parameter	S3D (Main)	S3M_HF	S3D-TP	STTH302S
Manufacturer	Diodes Incorporated	Diodes Incorporated	Micro Commercial Co	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	200 V	1000 V	200 V	200 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	1.15 V @ 3 A	1.2 V @ 3 A	950 mV @ 3 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Fast Recovery =< 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	10 µA @ 200 V	10 µA @ 1000 V	10 µA @ 200 V	3 µA @ 200 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Operating Temperature - Junction	-65 to 150°C	-65 to 150°C	-55 to 150°C	Max 175°C
Product Status	Obsolete	Active	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

S3M_HF (Diodes Incorporated): This part is the manufacturer-recommended substitute. It maintains identical current and forward voltage specifications while providing elevated voltage rating (1000 V vs. 200 V). The S3M_HF is classified as Active product status, ensuring long-term availability and supply chain continuity. It is ROHS3 compliant and REACH unaffected, matching the compliance profile of the original S3D. The higher voltage rating provides additional design margin for applications operating below 200 V.

S3D-TP (Micro Commercial Co): This part is a direct electrical equivalent with identical voltage (200 V) and current (3 A) ratings. It is supplied in Tape & Reel packaging format. The S3D-TP is classified as Not For New Designs, indicating limited future availability. The operating temperature minimum is -55°C, which is 10°C higher than the S3D specification. This part is suitable for legacy system support only.

STTH302S (STMicroelectronics): This part meets all primary substitution criteria with identical voltage and current ratings. It features fast recovery characteristics (≤500ns vs. >500ns) and lower reverse leakage current (3 µA vs. 10 µA). The STTH302S is classified as Active product status with maximum junction temperature of 175°C. This part is suitable for applications requiring improved switching performance and lower leakage characteristics.

Frequently Asked Questions (FAQ)

Q: Can the S3M_HF be used as a direct replacement for the S3D?

A: Yes. The S3M_HF is electrically compatible for applications rated at 200 V or below. The elevated voltage rating (1000 V) does not prevent substitution in 200 V circuits. The identical current rating (3 A) and forward voltage characteristics (1.15 V @ 3 A) ensure functional equivalence. The S3M_HF is the manufacturer-recommended substitute and is classified as Active product status.

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

A: Recovery speed refers to the time required for the diode to transition from conducting to blocking state. The S3D specifies standard recovery (>500ns), while the STTH302S specifies fast recovery (≤500ns). Fast recovery diodes exhibit lower reverse recovery time (35 ns vs. 2 µs), resulting in reduced switching losses and improved efficiency in high-frequency applications. Fast recovery diodes are suitable for replacement in applications where switching performance is not constrained.

Q: Are all substitute parts available in the same SMC package?

A: Yes. All substitute parts listed (S3M_HF, S3D-TP, STTH302S) are packaged in DO-214AB, SMC format. This ensures mechanical compatibility and identical PCB footprint. Packaging format variations (Tape & Reel vs. Cut Tape) do not affect electrical performance or physical dimensions.

Q: What is the significance of product status classifications?

A: Product status indicates supply chain availability and manufacturer support. Active status (S3M_HF, STTH302S) indicates ongoing production and long-term availability. Obsolete status (S3D) indicates discontinued production. Not For New Designs status (S3D-TP) indicates limited future availability and is suitable for legacy system support only. For new designs, Active status parts are recommended.

Q: Can the S3D-TP be used if the operating temperature minimum requirement is -55°C instead of -65°C?

A: The S3D-TP operating temperature range is -55°C to 150°C, which is 10°C higher at the minimum than the S3D specification (-65°C to 150°C). Substitution is valid only if the application does not require operation below -55°C. If the circuit must operate at temperatures below -55°C, the S3D-TP is not suitable.

Q: What are the compliance implications of using substitute parts?

A: All substitute parts (S3M_HF, S3D-TP, STTH302S) are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original S3D. No additional compliance verification is required for substitution within the same regulatory framework.

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