SM4935A-TP Equivalent & Substitute Parts

Part Overview

The SM4935A-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 200 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The fast recovery characteristic (≤500 ns for currents >200 mA) positions this diode for applications requiring rapid switching performance in low-to-medium voltage rectification circuits.

Substiute Parts

SM4935A-TP

Micro Commercial CoIn Stock: 1064SM4935A-TP Datasheet

Current PartRFQ

FS1G-LTP

Micro Commercial CoIn Stock: 8702FS1G-LTP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM4935A-TP is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Package / Case: DO-214AC (SMA) surface mount configuration
• Mounting Type: Surface mount
• Current - Average Rectified (Io): 1 A minimum
• Voltage - DC Reverse (Vr) (Max): Equal to or greater than 200 V
• Speed Classification: Fast recovery characteristic (≤500 ns for currents >200 mA)
• RoHS Compliance: ROHS3 Compliant
• Moisture Sensitivity Level: MSL 1 (Unlimited)

The substitute part FS1G-LTP meets all mandatory criteria. It maintains the same package, mounting type, current rating, and fast recovery speed classification. The FS1G-LTP provides a higher reverse voltage rating (400 V) and improved reverse recovery time (150 ns versus 200 ns), making it suitable for applications where the SM4935A-TP is no longer available. The higher voltage rating ensures compatibility with circuits designed for the 200 V specification while providing additional design margin.

Parameter Comparison

Engineering Selection Recommendations

The FS1G-LTP is the direct substitute for the obsolete SM4935A-TP. Both components are manufactured by Micro Commercial Co and maintain ROHS3 compliance and MSL 1 classification, ensuring compatibility with current manufacturing and environmental standards.

The FS1G-LTP is currently in active production status, providing assured long-term availability compared to the obsolete SM4935A-TP. The higher reverse voltage rating (400 V versus 200 V) is fully compatible with applications designed for 200 V operation and provides additional voltage margin for circuit protection.

The improved reverse recovery time of the FS1G-LTP (150 ns versus 200 ns) results in faster switching performance, which is beneficial for high-frequency rectification applications. The increased junction temperature lower limit (-50°C versus -55°C) remains within acceptable operating ranges for most industrial and commercial applications.

The FS1G-LTP is supplied in Tape & Reel (TR) packaging format, which is standard for automated assembly processes. Both components share identical package and mounting specifications (DO-214AC, SMA, surface mount), eliminating the need for PCB redesign or assembly process modification.

Frequently Asked Questions (FAQ)

Q: Can the FS1G-LTP be used as a direct replacement for the SM4935A-TP without circuit modification?

A: Yes. The FS1G-LTP is a direct substitute. Both components share the same package (DO-214AC/SMA), mounting type (surface mount), current rating (1 A), and fast recovery speed classification. The higher reverse voltage rating of the FS1G-LTP (400 V) is fully compatible with circuits designed for 200 V operation.

Q: What are the key differences between the SM4935A-TP and FS1G-LTP?

A: The primary differences are: (1) Product Status—SM4935A-TP is obsolete while FS1G-LTP is active; (2) Reverse Voltage Rating—FS1G-LTP is rated for 400 V versus 200 V; (3) Reverse Recovery Time—FS1G-LTP has 150 ns versus 200 ns; (4) Capacitance—FS1G-LTP has 50 pF versus 15 pF at 4 V, 1 MHz; (5) Operating Temperature Lower Limit—FS1G-LTP is -50°C versus -55°C.

Q: Are there any thermal or performance considerations when substituting the FS1G-LTP for the SM4935A-TP?

A: The FS1G-LTP exhibits faster reverse recovery (150 ns versus 200 ns), which reduces switching losses and heat generation in high-frequency applications. The operating temperature range of the FS1G-LTP (-50°C to 150°C) is slightly narrower at the lower limit but remains suitable for standard industrial and commercial temperature environments.

Q: Does the FS1G-LTP meet the same compliance and environmental standards as the SM4935A-TP?

A: Yes. Both components are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification. Both are assigned ECCN EAR99 and HTSUS 8541.10.0080 codes, ensuring equivalent regulatory and environmental compliance.

Q: What is the impact of the increased capacitance in the FS1G-LTP (50 pF versus 15 pF)?

A: The increased capacitance of the FS1G-LTP (50 pF at 4 V, 1 MHz) compared to the SM4935A-TP (15 pF at 4 V, 1 MHz) may affect high-frequency circuit performance. In applications operating above 1 MHz, circuit simulation or testing is recommended to verify performance compatibility, particularly in switching power supplies or RF rectification circuits.

Q: Is the FS1G-LTP available in the same packaging format as the SM4935A-TP?

A: Both components use the DO-214AC (SMA) surface mount package. The FS1G-LTP is supplied in Tape & Reel (TR) format, which is standard for automated assembly. The SM4935A-TP packaging format was not specified in the original documentation.