SM4934A-TP Equivalent & Substitute Parts

Part Overview

The SM4934A-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 100 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts are selected based on matching or exceeding electrical performance parameters while maintaining mechanical compatibility with the DO-214AC package footprint.

Substiute Parts

SM4934A-TP

Micro Commercial CoIn Stock: 1231SM4934A-TP Datasheet

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FS1G-LTP

Micro Commercial CoIn Stock: 8702FS1G-LTP Datasheet

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ES1B-M3/5AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 917ES1B-M3/5AT Datasheet

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S2BA R3G

Taiwan Semiconductor CorporationIn Stock: 1075S2BA R3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SM4934A-TP are grouped into two categories based on electrical parameter compatibility:

Category 1: Direct Voltage Rating Equivalents (100 V) Parts maintaining the 100 V DC reverse voltage rating with 1 A or greater average rectified current capacity. These substitutes provide equivalent or improved performance within the same voltage class and are suitable for direct replacement in applications where the 100 V rating is a design requirement.

Category 2: Higher Voltage Rating Substitutes (400 V) Parts exceeding the 100 V voltage rating while maintaining 1 A average rectified current capacity. These substitutes provide enhanced voltage margin and are suitable for applications where higher voltage headroom is acceptable or beneficial.

Key Parameters Determining Substitution:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 100 V
• Current - Average Rectified (Io): Must equal or exceed 1 A
• Package / Case: Must be DO-214AC (SMA) for mechanical compatibility
• Mounting Type: Must be Surface Mount
• Technology: Standard rectifier diode technology

Parameter Comparison

Engineering Selection Recommendations

ES1B-M3/5AT (Vishay General Semiconductor - Diodes Division) This part is recommended as the primary substitute for the SM4934A-TP. It maintains identical voltage and current ratings (100 V, 1 A) with the same DO-214AC package. The ES1B-M3/5AT offers superior reverse recovery time performance (25 ns versus 200 ns) and is currently in active production status. Full ROHS3 compliance and REACH unaffected status support long-term supply chain stability.

FS1G-LTP (Micro Commercial Co) This part is recommended for applications requiring enhanced voltage margin. The FS1G-LTP provides 400 V DC reverse voltage rating with identical 1 A current capacity and DO-214AC package compatibility. Active product status and improved reverse recovery time (150 ns) support reliability requirements. Selection of this part is appropriate when circuit design permits operation at higher voltage ratings or when voltage transient protection is a design consideration.

S2BA R3G (Taiwan Semiconductor Corporation) This part provides 100 V voltage rating with increased current capacity (1.5 A versus 1 A) in the DO-214AC package. However, product status is discontinued at DiGi Electronics, limiting long-term procurement viability. This part is suitable only for applications where existing inventory is available and current capacity upgrade is required.

All substitute parts maintain ROHS3 compliance, surface mount DO-214AC package compatibility, and operating temperature range of -55°C to 150°C or better, ensuring functional equivalence within the specified design envelope.

Frequently Asked Questions (FAQ)

Q: Can the ES1B-M3/5AT directly replace the SM4934A-TP in my circuit? A: Yes. The ES1B-M3/5AT maintains identical voltage (100 V) and current (1 A) ratings with the same DO-214AC package footprint. The improved reverse recovery time (25 ns) provides enhanced performance characteristics. No circuit modifications are required.

Q: What is the primary difference between the ES1B-M3/5AT and FS1G-LTP substitutes? A: The ES1B-M3/5AT maintains the 100 V voltage rating of the original SM4934A-TP, while the FS1G-LTP provides a 400 V voltage rating. Both parts support 1 A average rectified current and use the DO-214AC package. Selection depends on whether your circuit design requires the original 100 V rating or can accommodate higher voltage operation.

Q: Why is the S2BA R3G listed as a substitute if it is discontinued? A: The S2BA R3G is included because it was originally listed as a substitute for the SM4934A-TP in the manufacturer's documentation. While it offers increased current capacity (1.5 A), its discontinued status limits procurement viability for new designs. It remains relevant only for applications with existing inventory or legacy system support.

Q: Are all substitute parts compatible with the same PCB footprint? A: Yes. All substitute parts use the DO-214AC (SMA) package, which maintains identical mechanical dimensions and land pattern compatibility. No PCB redesign is required for substitution.

Q: What compliance certifications apply to the substitute parts? A: All substitute parts listed are ROHS3 compliant. The ES1B-M3/5AT and FS1G-LTP carry REACH unaffected status, supporting regulatory compliance for European and international markets.

Q: How does reverse recovery time affect part selection? A: Reverse recovery time (trr) determines the speed at which the diode transitions from conducting to blocking state. The ES1B-M3/5AT (25 ns) and FS1G-LTP (150 ns) offer faster recovery than the original SM4934A-TP (200 ns), reducing switching losses in high-frequency applications. The S2BA R3G (1500 ns) represents standard recovery performance. Selection should align with circuit switching frequency requirements.

Q: Can I use the FS1G-LTP in a circuit designed for 100 V operation? A: Yes. The FS1G-LTP is rated for 400 V maximum reverse voltage, which exceeds the 100 V design requirement. Operating at lower voltage than the part rating does not compromise functionality. This configuration provides additional voltage margin for transient protection.