S3DB Equivalent & Substitute Parts

Part Overview

The S3DB 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 SMB (DO-214AA) package. This part is classified as Obsolete, indicating it is no longer in active production. Identification of equivalent and substitute parts is necessary to support ongoing maintenance, repair, and new design requirements where this component specification remains applicable or where enhanced performance characteristics are acceptable.

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)	—
Current - Reverse Leakage @ Vr	10	µA @ 200 V
Capacitance @ Vr, F	40	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S3DB is determined by the following critical parameters:

Voltage Rating Compatibility: The S3DB operates at 200 V DC reverse voltage maximum. Substitute parts must meet or exceed this voltage specification to ensure safe operation in the original application circuit.

Current Rating Compatibility: The 3 A average rectified current rating is a primary selection criterion. Substitute parts must support this current level without thermal or reliability degradation.

Package Compatibility: The DO-214AA (SMB) Surface Mount package is mandatory for direct mechanical and electrical substitution. Pin configuration and footprint must remain identical.

Forward Voltage Characteristics: The forward voltage drop at rated current (1.15 V @ 3 A) affects circuit efficiency and thermal performance. Substitute parts with identical or lower forward voltage are acceptable.

Recovery Speed: Standard recovery characteristics (>500ns, >200mA) define the switching behavior. Substitute parts must maintain equivalent or faster recovery performance.

Temperature Range: Operating junction temperature range of -55°C to 150°C establishes the thermal operating envelope. Substitute parts must support this range or a superset thereof.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status are mandatory for new designs and ongoing supply chain qualification.

Parameter Comparison

Parameter	S3DB (Main Part)	S3MB_HF (Recommended)	S3DB-TP (Similar)
Manufacturer	Diodes Incorporated	Diodes Incorporated	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	200 V	1000 V	200 V
Current - Average Rectified (Io)	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	1.15 V @ 3 A	1.15 V @ 3 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	10 µA @ 200 V	10 µA @ 1000 V	10 µA @ 200 V
Capacitance @ Vr, F	40 pF @ 4V, 1MHz	40 pF @ 4V, 1MHz	Not specified
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-55 to 150 °C	-65 to 150 °C	Not specified
Product Status	Obsolete	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

S3MB_HF (Diodes Incorporated): This part is the manufacturer-recommended substitute. It maintains identical current (3 A) and forward voltage (1.15 V @ 3 A) specifications while providing enhanced voltage rating (1000 V vs. 200 V). The S3MB_HF is in Active product status, ensuring long-term availability and supply chain stability. Operating temperature range extends to -65°C, providing improved low-temperature performance. Both parts are ROHS3 compliant and REACH unaffected. The higher voltage rating introduces no functional incompatibility in applications designed for 200 V operation and provides design margin for transient overvoltage conditions. This part is suitable for new designs and ongoing production.

S3DB-TP (Micro Commercial Co): This part provides electrical equivalence with identical voltage (200 V) and current (3 A) ratings. It is supplied in Tape & Reel packaging and is ROHS3 compliant. Product status is classified as Not For New Designs, indicating limited future availability. This part is suitable for maintenance and repair of existing equipment where original part specifications are required and supply from the primary manufacturer is unavailable. Capacitance specification is not provided for this variant.

S3DB (Diodes Incorporated): This is the original part number. Identical electrical and thermal specifications confirm direct equivalence. Obsolete status indicates discontinued production. This part number may be referenced in legacy documentation and design files but should not be selected for new designs due to supply discontinuation.

Frequently Asked Questions (FAQ)

Q: Can the S3MB_HF replace the S3DB in existing applications?

A: Yes. The S3MB_HF maintains identical current (3 A) and forward voltage (1.15 V @ 3 A) specifications. The higher voltage rating (1000 V vs. 200 V) is a superset specification that does not degrade performance in 200 V applications. Both parts use the DO-214AA (SMB) package with identical pinout and footprint. Regulatory compliance (ROHS3, REACH) is equivalent.

Q: What is the difference between S3DB and S3DB-TP?

A: Both parts have identical electrical specifications (200 V, 3 A, 1.15 V forward voltage). The primary difference is packaging: S3DB-TP is supplied in Tape & Reel format, while S3DB is supplied in standard packaging. S3DB-TP is manufactured by Micro Commercial Co, while S3DB is manufactured by Diodes Incorporated. S3DB-TP is classified as Not For New Designs, limiting its suitability for ongoing production.

Q: Are all substitute parts compatible with the DO-214AA footprint?

A: Yes. All listed substitute parts use the DO-214AA (SMB) Surface Mount package. Mechanical compatibility with existing PCB layouts is confirmed. Pin configuration and electrical connection points are identical across all parts.

Q: What is the significance of the voltage rating difference between S3DB (200 V) and S3MB_HF (1000 V)?

A: The voltage rating specifies the maximum reverse voltage the diode can withstand without breakdown. A higher rating (1000 V) is a superset specification that does not affect operation in circuits designed for lower voltages (200 V). The S3MB_HF provides additional design margin for transient overvoltage protection without introducing functional incompatibility.

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

A: The S3MB_HF is the recommended choice for new designs. It is in Active product status, ensuring long-term availability and supply chain continuity. It maintains electrical equivalence with the S3DB while providing enhanced voltage rating and extended low-temperature operating range (-65°C vs. -55°C).

Q: Are there compliance or regulatory differences between the substitute parts?

A: No. All listed parts are ROHS3 compliant and REACH unaffected. Regulatory compliance is equivalent across S3DB, S3MB_HF, and S3DB-TP. ECCN and HTSUS classifications are identical.

Q: What does "Not For New Designs" mean for the S3DB-TP?

A: This classification indicates the part is in end-of-life status and is not recommended for incorporation into new product designs. It may be used for maintenance, repair, and obsolescence management of existing equipment. Future availability is not guaranteed.

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