SM4933A-TP Equivalent & Substitute Parts

Part Overview

The SM4933A-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as obsolete, indicating discontinuation from active production. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode specification.

Substiute Parts

SM4933A-TP

Micro Commercial CoIn Stock: 741SM4933A-TP Datasheet

Current PartRFQ

FS1G-LTP

Micro Commercial CoIn Stock: 8702FS1G-LTP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete SM4933A-TP requires identification of alternative diodes that maintain functional compatibility within the application circuit. The primary substitution candidate is the FS1G-LTP, manufactured by Micro Commercial Co.

Substitution logic is based on the following critical parameters:

• Package Compatibility: Both SM4933A-TP and FS1G-LTP utilize the DO-214AC (SMA) surface mount package, ensuring mechanical and electrical interface compatibility on printed circuit boards.
• Current Rating: Both components are rated for 1 A average rectified current, maintaining identical current-handling capability.
• Speed Classification: Both diodes are classified as fast recovery devices with reverse recovery time ≤ 500 ns for currents > 200 mA, ensuring equivalent switching performance characteristics.
• Reverse Leakage: Both components specify 5 µA reverse leakage current at their respective rated voltages, indicating comparable junction quality.
• Mounting Type: Both are surface mount devices, compatible with automated assembly processes.
• Environmental Compliance: Both components are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating.

The FS1G-LTP operates at a higher maximum reverse voltage (400 V versus 50 V), which does not preclude substitution in applications designed for the SM4933A-TP. Higher voltage-rated diodes function correctly in lower-voltage applications, provided all other electrical and mechanical parameters remain within acceptable limits.

Parameter Comparison

Engineering Selection Recommendations

The FS1G-LTP is the direct substitute for the obsolete SM4933A-TP based on the following engineering criteria:

Product Status and Availability: The FS1G-LTP maintains active product status with 8600 pieces in stock, ensuring reliable supply chain access. The SM4933A-TP is obsolete with limited remaining inventory (656 pieces), making transition to an active alternative necessary for long-term production support.

Compliance and Certifications: Both components are ROHS3 compliant and carry identical MSL 1 (Unlimited) ratings, ensuring equivalent environmental and regulatory compliance. The FS1G-LTP includes REACH Unaffected status, providing additional regulatory documentation.

Electrical Compatibility: The FS1G-LTP maintains identical current rating (1 A) and fast recovery speed classification. The higher reverse voltage rating (400 V versus 50 V) presents no functional limitation in applications designed for 50 V operation. The improved reverse recovery time (150 ns versus 200 ns) provides enhanced switching performance.

Package and Mounting Compatibility: Both components utilize identical DO-214AC (SMA) surface mount packaging, enabling direct board-level substitution without design modification or assembly process changes.

Temperature Range Consideration: The FS1G-LTP operating temperature range (-50°C ~ 150°C) is slightly narrower at the lower bound compared to the SM4933A-TP (-55°C ~ 150°C). This difference is negligible for standard industrial and commercial applications operating within -40°C to +85°C or -55°C to +125°C specifications.

Frequently Asked Questions (FAQ)

Q: Can the FS1G-LTP directly replace the SM4933A-TP without circuit modification?

A: Yes. Both components share identical package geometry (DO-214AC, SMA), current rating (1 A), and fast recovery speed classification. Direct substitution on the printed circuit board is supported without design changes.

Q: Why does the FS1G-LTP have a higher voltage rating (400 V) than the SM4933A-TP (50 V)?

A: Higher voltage-rated diodes function correctly in lower-voltage applications. The 400 V rating of the FS1G-LTP provides design margin and does not create incompatibility with circuits designed for 50 V operation. The diode will not conduct or fail when exposed to voltages below its maximum rating.

Q: Are there differences in forward voltage drop between these components?

A: The FS1G-LTP specifies a maximum forward voltage of 1.3 V @ 1 A. The SM4933A-TP forward voltage specification is not provided in the available data. Forward voltage characteristics should be verified against application requirements if this parameter is critical to circuit performance.

Q: What is the significance of the improved reverse recovery time in the FS1G-LTP?

A: The FS1G-LTP exhibits a reverse recovery time of 150 ns compared to 200 ns for the SM4933A-TP. This 25% improvement reduces switching losses and electromagnetic interference in high-frequency applications, providing enhanced performance characteristics.

Q: Are both components suitable for the same temperature range applications?

A: Both components support operation to +150°C. The FS1G-LTP minimum operating temperature is -50°C versus -55°C for the SM4933A-TP. For applications requiring operation below -50°C, the SM4933A-TP specification should be verified. Standard industrial applications operating within -40°C to +85°C are fully supported by both components.

Q: What is the packaging difference between the main part and substitute?

A: The SM4933A-TP is supplied in standard packaging (not specified). The FS1G-LTP is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly. Both components use identical DO-214AC (SMA) component packaging, ensuring board-level compatibility.

Q: Is the FS1G-LTP available in sufficient quantity for production?

A: Yes. The FS1G-LTP maintains active product status with 8600 pieces in current inventory, providing reliable supply for ongoing production requirements. The SM4933A-TP, classified as obsolete, has limited remaining stock (656 pieces).

Q: Are there any compliance or certification differences between these components?

A: Both components are ROHS3 compliant and carry MSL 1 (Unlimited) ratings. The FS1G-LTP includes REACH Unaffected status. Both components carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications for export and tariff purposes.