S4G Equivalent & Substitute Parts Reference

Part Overview

The S4G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 4 A average rectified current. The device is packaged in the DO-214AB (SMC) surface mount configuration and is classified as a standard recovery diode with a reverse recovery time of 1.5 µs. This component is suitable for power supply circuits, bridge rectifiers, and general rectification applications requiring moderate voltage and current ratings. The S4G maintains Active product status and is RoHS3 compliant, making it suitable for current industrial and commercial applications. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AB package family.

Substiute Parts

S4G

Taiwan Semiconductor CorporationIn Stock: 2966S4G Datasheet

Current PartRFQ

S4G

Taiwan Semiconductor CorporationIn Stock: 2966S4G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S4G rectifier diode are identified based on strict equivalence of the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 400 V
• Current - Average Rectified (Io): 4 A
• Reverse Recovery Time (trr): 1.5 µs
• Current - Reverse Leakage @ Vr: 100 µA @ 400 V
• Capacitance @ Vr, F: 60 pF @ 4V, 1MHz

Mechanical Equivalence Criteria:

• Package / Case: DO-214AB, SMC
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 150°C

Compliance Equivalence Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• Product Status: Active

Parts meeting all specified parameters within these categories are classified as direct equivalents and may be substituted without circuit redesign or thermal management modifications.

Parameter Comparison

Engineering Selection Recommendations

The S4G rectifier diode is an Active product with full RoHS3 compliance and REACH unaffected status, confirming its suitability for current manufacturing and deployment. The part carries Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

When selecting the S4G or its direct equivalent, the following engineering considerations apply:

Compliance Verification: Confirm that the target application environment and supply chain requirements align with RoHS3 and REACH compliance status. The S4G meets these standards without exception.

Thermal Management: The operating temperature range of -55°C to 150°C junction temperature establishes the thermal envelope for circuit design. Ensure that PCB layout and thermal dissipation provisions accommodate the 4 A average rectified current at the maximum rated voltage of 400 V.

Package Handling: The DO-214AB (SMC) surface mount package is compatible with standard reflow soldering processes. MSL 1 classification permits standard handling without desiccant storage or bake-out procedures.

Electrical Performance: The 1.5 µs reverse recovery time and 100 µA reverse leakage current at 400 V define the switching and standby characteristics. These parameters are fixed across all equivalent parts and determine circuit performance in rectification and freewheeling applications.

Frequently Asked Questions (FAQ)

Q: What defines a direct equivalent for the S4G rectifier diode?

A: A direct equivalent must match all electrical parameters (400 V reverse voltage, 4 A average rectified current, 1.5 µs reverse recovery time, 100 µA reverse leakage, 60 pF capacitance), the DO-214AB surface mount package, and compliance certifications (RoHS3, MSL 1). Parts meeting these criteria require no circuit modification.

Q: Can the S4G be substituted with a diode rated for higher voltage or current?

A: Parts with higher voltage or current ratings are not direct equivalents. Higher-rated devices may introduce different reverse recovery characteristics, leakage currents, and capacitance values that alter circuit performance. Selection of higher-rated parts requires circuit analysis and validation.

Q: Is the DO-214AB package compatible with standard PCB assembly equipment?

A: Yes. The DO-214AB (SMC) is a standard surface mount package compatible with automated pick-and-place equipment and reflow soldering processes. No special assembly procedures are required.

Q: What is the significance of the 1.5 µs reverse recovery time?

A: Reverse recovery time defines the switching speed of the diode when transitioning from forward conduction to reverse blocking. The 1.5 µs specification classifies the S4G as a standard recovery diode, suitable for general-purpose rectification at line frequencies and moderate switching speeds. Applications requiring faster switching require parts with lower reverse recovery times.

Q: Does MSL 1 (Unlimited) affect component storage or handling?

A: No. MSL 1 indicates that the component has no moisture sensitivity limitations. Standard dry storage conditions are sufficient; desiccant storage, bake-out procedures, or time-limited shelf life restrictions do not apply.

Q: Are there any temperature derating considerations for the S4G?

A: The S4G is rated for junction temperatures from -55°C to 150°C. Circuit design must ensure that the actual junction temperature remains within this range under maximum load and ambient conditions. Thermal analysis of the PCB layout and heat dissipation path is required for applications operating near the upper temperature limit.

Q: What is the difference between the S4G and parts with different reverse recovery times?

A: Reverse recovery time directly affects switching losses and electromagnetic interference (EMI) characteristics. The S4G with 1.5 µs recovery time is optimized for standard rectification. Parts with shorter recovery times (< 500 ns) are designed for high-frequency switching applications and will exhibit different performance in general-purpose circuits.