SF33-TP Equivalent & Substitute Parts

Part Overview

The SF33-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 150 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, which necessitates identification of active equivalent parts to maintain design continuity and ensure supply chain availability. The SF33-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, making it suitable for standard rectification applications requiring moderate voltage and current ratings.

Substiute Parts

SF33-TP

Micro Commercial CoIn Stock: 983SF33-TP Datasheet

Current PartRFQ

SF33G-TP

Micro Commercial CoIn Stock: 1196SF33G-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete SF33-TP is determined by strict equivalence across the following critical parameters:

• Voltage Rating: DC reverse voltage must equal 150 V
• Current Rating: Average rectified current must equal 3 A
• Forward Voltage Drop: Maximum forward voltage at rated current must equal 950 mV @ 3 A
• Recovery Characteristics: Reverse recovery time must equal 35 ns with fast recovery classification (≤ 500 ns, > 200 mA)
• Reverse Leakage: Maximum reverse leakage current must equal 5 µA @ 150 V
• Package: DO-201AD axial through-hole package required for mechanical and electrical compatibility
• Compliance: RoHS3 compliance required for regulatory alignment

The SF33G-TP qualifies as a direct substitute based on identical electrical ratings and package specifications. The substitute part maintains all critical electrical parameters while offering improved product status (active versus obsolete) and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The SF33G-TP is a direct functional equivalent to the SF33-TP and is the appropriate selection for new designs and component replacement applications. The substitute part maintains identical electrical performance across all critical rectification parameters: reverse voltage, forward current, forward voltage drop, and reverse recovery time.

The SF33G-TP offers two additional advantages over the obsolete SF33-TP:

1. Active Product Status: The SF33G-TP is an active product with confirmed inventory availability (1162 pcs), ensuring reliable supply chain access and long-term component availability.

2. Extended Operating Temperature Range: The SF33G-TP operates across -65°C to 150°C, compared to the SF33-TP range of -55°C to 125°C, providing broader thermal performance envelope for demanding applications.

Both parts maintain ROHS3 compliance and identical package specifications (DO-201AD axial through-hole), ensuring mechanical and electrical compatibility in existing circuit designs. The lower capacitance value of the SF33G-TP (50 pF versus 100 pF) represents an improvement in high-frequency switching performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the SF33G-TP be used as a direct replacement for the SF33-TP in existing designs?

A: Yes. The SF33G-TP is electrically and mechanically equivalent to the SF33-TP. All critical rectification parameters are identical, including voltage rating (150 V), current rating (3 A), forward voltage drop (950 mV @ 3 A), and reverse recovery time (35 ns). The DO-201AD axial through-hole package is identical, allowing direct substitution without circuit modification.

Q: What is the significance of the extended operating temperature range in the SF33G-TP?

A: The SF33G-TP operates from -65°C to 150°C, compared to the SF33-TP range of -55°C to 125°C. This extended range provides additional thermal margin for applications operating in extreme temperature environments. For applications within the original SF33-TP temperature range (-55°C to 125°C), both parts perform identically.

Q: Why does the SF33G-TP have lower capacitance than the SF33-TP?

A: The SF33G-TP exhibits 50 pF capacitance at 4 V, 1 MHz, compared to 100 pF for the SF33-TP. Lower junction capacitance improves switching performance at higher frequencies and reduces charge storage effects. This represents a performance enhancement for applications sensitive to capacitive effects.

Q: Are both parts RoHS compliant?

A: Yes. Both the SF33-TP and SF33G-TP are ROHS3 compliant, meeting regulatory requirements for hazardous substance restrictions in electronic components.

Q: What is the primary reason to transition from SF33-TP to SF33G-TP?

A: The SF33-TP is classified as obsolete, creating supply chain risk. The SF33G-TP is an active product with confirmed inventory availability, ensuring long-term component sourcing and design continuity. Functionally, both parts are equivalent across all critical electrical parameters.

Q: Are there any circuit design considerations when substituting the SF33G-TP for the SF33-TP?

A: No circuit design changes are required. The SF33G-TP maintains identical electrical ratings and package specifications. The lower capacitance of the SF33G-TP may provide marginal improvements in switching applications but does not require design modification.