SF34-TP Equivalent & Substitute Parts

Part Overview

The SF34-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 200 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, making identification of active equivalent components essential for ongoing design support and procurement continuity. The SF34-TP operates across a junction temperature range of -55°C to 125°C and features fast recovery characteristics with a reverse recovery time of 35 ns, suitable for standard rectification applications requiring moderate switching speeds.

Substiute Parts

SF34-TP

Micro Commercial CoIn Stock: 833SF34-TP Datasheet

Current PartRFQ

SF34G-TP

Micro Commercial CoIn Stock: 1111SF34G-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SF34-TP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 200 V
• Current - Average Rectified (Io): 3 A
• Package / Case: DO-201AD, Axial
• Mounting Type: Through Hole
• Technology: Standard
• Speed Classification: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Allowable Variations:

• Voltage - Forward (Vf) (Max) @ If: Within ±50 mV tolerance
• Reverse Recovery Time (trr): Within ±10 ns tolerance
• Current - Reverse Leakage @ Vr: Within ±5 µA tolerance
• Capacitance @ Vr, F: Variation permitted (non-critical for rectification function)
• Operating Temperature - Junction: Extended range acceptable (higher upper limit or lower lower limit)
• Packaging Format: Tape & Reel (TR) acceptable as substitute for bulk packaging
• Product Status: Active preferred over obsolete

The SF34G-TP meets all mandatory matching criteria and represents a direct functional equivalent with active product status and improved temperature range capability.

Parameter Comparison

Engineering Selection Recommendations

The SF34G-TP is the direct active equivalent for the obsolete SF34-TP. Selection of SF34G-TP is supported by the following engineering factors:

Product Status: SF34G-TP holds active product status with Micro Commercial Co, ensuring long-term availability and manufacturing continuity. The SF34-TP is classified as obsolete, creating supply chain risk.

Electrical Equivalence: All critical electrical parameters—reverse voltage rating, average rectified current, forward voltage drop, and reverse recovery time—are identical between the two parts. The lower capacitance specification of SF34G-TP (50 pF versus 100 pF) represents an improvement for high-frequency switching applications and does not degrade performance in standard rectification circuits.

Compliance: Both parts maintain ROHS3 compliance. SF34G-TP additionally carries REACH Unaffected status, providing enhanced regulatory documentation.

Temperature Range: SF34G-TP extends the operating junction temperature range to -65°C ~ 150°C, providing superior performance margin across wider environmental conditions compared to the SF34-TP range of -55°C ~ 125°C.

Packaging Consideration: SF34G-TP is supplied in Tape & Reel (TR) format, standard for active production components. Applications requiring bulk packaging may require reel-to-tube conversion or alternative procurement arrangements.

Frequently Asked Questions (FAQ)

Q: Can SF34G-TP directly replace SF34-TP in existing designs without circuit modification?

A: Yes. SF34G-TP is electrically and mechanically equivalent to SF34-TP across all critical rectification parameters. The identical reverse voltage rating (200 V), average rectified current (3 A), forward voltage drop (950 mV @ 3 A), and package format (DO-201AD through-hole) ensure direct substitution. No circuit redesign is required.

Q: What is the significance of the lower capacitance in SF34G-TP?

A: SF34G-TP specifies 50 pF capacitance at 4 V, 1 MHz, compared to 100 pF for SF34-TP. Lower junction capacitance improves switching performance at higher frequencies and reduces charge storage effects. For standard 50/60 Hz rectification applications, this difference is not functionally significant. For applications operating above 1 kHz, the lower capacitance of SF34G-TP provides a performance advantage.

Q: Does the extended temperature range of SF34G-TP affect circuit performance?

A: SF34G-TP operates from -65°C to 150°C, compared to SF34-TP range of -55°C to 125°C. The extended range provides additional design margin for applications in extreme temperature environments. For applications within the original SF34-TP temperature range, both parts perform identically. The extended range does not introduce any performance degradation within the original operating window.

Q: What is the difference between bulk packaging and Tape & Reel format?

A: SF34-TP was supplied in bulk packaging; SF34G-TP is supplied in Tape & Reel (TR) format. Tape & Reel is the standard packaging for active production components and is optimized for automated assembly processes. Bulk packaging is typically used for legacy or low-volume products. Both formats contain the same component; the difference is in presentation and handling method. High-volume manufacturers prefer Tape & Reel; manual assembly or small-quantity applications may require conversion to tube or bulk format.

Q: Are there any compliance or certification differences between SF34-TP and SF34G-TP?

A: Both parts are ROHS3 compliant. SF34G-TP additionally carries REACH Unaffected status, indicating no substances of very high concern (SVHC) are present above regulatory thresholds. Both parts carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. SF34G-TP provides enhanced regulatory documentation suitable for applications requiring comprehensive compliance verification.

Q: Is SF34G-TP available in the same quantities as SF34-TP?

A: SF34G-TP is an active product with higher inventory availability (1046 Pcs reported in stock) compared to SF34-TP (745 Pcs). As an active component, SF34G-TP maintains consistent supply through standard distribution channels. SF34-TP, being obsolete, has limited remaining inventory with no ongoing manufacturing.