SM4935-TP Equivalent & Substitute Parts

Part Overview

The SM4935-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 (HSMA) package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The fast recovery characteristic (≤500 ns) and compact surface mount packaging make this diode suitable for standard rectification applications in power supply and signal conditioning circuits.

Substiute Parts

SM4935-TP

Micro Commercial CoIn Stock: 983SM4935-TP Datasheet

Current PartRFQ

VS-2EMH02-M3/5AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 883VS-2EMH02-M3/5AT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM4935-TP is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - DC Reverse (Vr) Maximum: 200 V
• Mounting Type: Surface Mount
• Package / Case: DO-214AC (SMA)
• Speed Classification: Fast Recovery ≤500 ns, >200 mA (Io)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Current Rating Consideration: The SM4935-TP is rated for 1 A average rectified current. Substitute parts with equal or higher current ratings (≥1 A) are electrically compatible, as they satisfy the voltage and speed requirements while providing equal or superior current handling capability within the same package footprint.

The VS-2EMH02-M3/5AT meets all critical parameters with a 2 A current rating, representing a direct functional substitute with enhanced current capacity.

Parameter Comparison

Engineering Selection Recommendations

The VS-2EMH02-M3/5AT is a direct functional substitute for the SM4935-TP based on the following engineering criteria:

Voltage and Package Compatibility: Both parts share identical 200 V DC reverse voltage ratings and DO-214AC surface mount packaging, ensuring direct PCB footprint compatibility without layout modifications.

Current Rating: The VS-2EMH02-M3/5AT provides 2 A average rectified current, exceeding the SM4935-TP requirement of 1 A. This higher rating ensures the substitute operates within safe margins for the original application without thermal or reliability concerns.

Speed and Recovery Characteristics: Both parts meet the fast recovery classification (≤500 ns, >200 mA). The VS-2EMH02-M3/5AT exhibits superior reverse recovery time (25 ns versus 200 ns), which reduces switching losses and improves circuit efficiency in high-frequency applications.

Leakage Current: The VS-2EMH02-M3/5AT demonstrates lower reverse leakage current (2 µA versus 5 µA at 200 V), indicating improved blocking characteristics and reduced standby power consumption.

Compliance and Product Status: The VS-2EMH02-M3/5AT is ROHS3 compliant with MSL 1 rating, matching the original part specifications. Active product status ensures long-term availability and supply chain continuity.

Temperature Range: The substitute operates across -55 to 175 °C, extending the upper junction temperature limit by 25 °C compared to the SM4935-TP (-55 to 150 °C), providing additional thermal margin in demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the VS-2EMH02-M3/5AT be used as a direct replacement for the SM4935-TP without circuit modifications?

A: Yes. Both parts share identical voltage ratings (200 V), package type (DO-214AC), and mounting configuration (surface mount). The substitute requires no PCB layout changes or circuit redesign. The higher current rating (2 A versus 1 A) is a performance enhancement that does not affect compatibility.

Q: What is the significance of the different reverse recovery times (200 ns versus 25 ns)?

A: Reverse recovery time (trr) determines how quickly the diode transitions from conducting to blocking state. The VS-2EMH02-M3/5AT's faster recovery (25 ns) reduces switching losses and electromagnetic interference, particularly beneficial in switching power supplies and high-frequency rectification circuits. The SM4935-TP's 200 ns recovery remains acceptable for standard rectification applications.

Q: Are there packaging differences between HSMA and SMA variants of the DO-214AC?

A: Both HSMA and SMA designations refer to the DO-214AC surface mount package. These are equivalent package types with identical footprints, lead spacing, and PCB mounting requirements. No physical or electrical differences affect substitution.

Q: Why is the VS-2EMH02-M3/5AT rated for 2 A when the original application requires only 1 A?

A: Higher current ratings provide design margin and thermal headroom. Operating the substitute at 1 A (50% of its 2 A rating) ensures lower junction temperature, extended component life, and improved reliability compared to operating the original 1 A part at full rating.

Q: Does the lower reverse leakage current (2 µA versus 5 µA) affect circuit performance?

A: Lower reverse leakage improves blocking efficiency and reduces standby power consumption, particularly in battery-powered or low-power applications. This is a performance benefit with no negative impact on circuit function.

Q: Is the extended operating temperature range (-55 to 175 °C versus -55 to 150 °C) relevant for standard applications?

A: The extended upper temperature limit provides additional thermal margin in high-ambient or high-power-density environments. For applications operating within the original -55 to 150 °C range, both parts perform identically. The extended range offers flexibility for future design iterations or thermal stress conditions.

Q: What is the significance of the FRED Pt® series designation for the VS-2EMH02-M3/5AT?

A: FRED Pt® (Fast Recovery Epitaxial Diode Platinum) is Vishay's product line designation indicating optimized fast recovery characteristics. This classification confirms the part meets fast recovery specifications and provides consistent performance across the product family.

Q: Are both parts RoHS3 compliant and suitable for regulated markets?

A: Yes. Both the SM4935-TP and VS-2EMH02-M3/5AT are ROHS3 compliant, meeting European Union Restriction of Hazardous Substances requirements. Both parts carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating no special storage or handling requirements.