S1KFP Equivalent & Substitute Parts

Part Overview

The S1KFP is a general-purpose rectifier diode manufactured by onsemi, rated for 800V DC reverse voltage and 1.2A average rectified current in a surface mount SOD-123H package. This device is classified as not for new designs, indicating it has been superseded in onsemi's product portfolio. Identifying equivalent and substitute parts is necessary for applications requiring continued support, design flexibility, or inventory optimization while maintaining electrical and mechanical compatibility.

Substiute Parts

S1KFP

onsemiIn Stock: 1088S1KFP Datasheet

Current PartRFQ

AS1PKHM3/84A

Vishay General Semiconductor - Diodes DivisionIn Stock: 9461AS1PKHM3/84A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the S1KFP is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 800V
• Current - Average Rectified (Io): Must equal or exceed 1.2A
• Reverse Recovery Time (trr): Must equal or be faster than 1.5µs
• Current - Reverse Leakage @ Vr: Must not exceed 5µA @ 800V
• Voltage - Forward (Vf): Lower values indicate improved efficiency

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount required
• Grade: Automotive qualification preferred for consistency
• Qualification: AEC-Q101 certification required
• RoHS Status: ROHS3 Compliant required
• Operating Temperature Range: Must accommodate -55°C to 150°C minimum

Package Consideration: The S1KFP uses SOD-123H packaging. Substitute parts may use alternative surface mount packages (such as DO-220AA) provided the physical footprint and pin configuration are compatible with the application's PCB layout and assembly process.

The AS1PKHM3/84A meets all electrical and compliance requirements for substitution.

Parameter Comparison

Engineering Selection Recommendations

AS1PKHM3/84A (Vishay General Semiconductor - Diodes Division)

The AS1PKHM3/84A is a qualified substitute for the S1KFP based on the following factors:

1. Electrical Equivalence: The substitute meets or exceeds all critical electrical parameters. The 800V reverse voltage rating is identical, and the 1.5A average rectified current exceeds the 1.2A requirement. Reverse recovery time and reverse leakage current specifications are identical.

2. Compliance and Certification: Both devices carry AEC-Q101 automotive qualification and ROHS3 compliance, ensuring regulatory and quality standards are maintained.

3. Product Status: The AS1PKHM3/84A is classified as Active, providing long-term availability and supply chain stability compared to the S1KFP's Not For New Designs status.

4. Operating Temperature Range: The substitute supports -55°C to 175°C, exceeding the S1KFP's -55°C to 150°C range, providing additional thermal margin.

5. Package Consideration: The AS1PKHM3/84A uses DO-220AA (SMP) packaging instead of SOD-123H. PCB layout compatibility must be verified before implementation, as package footprints differ.

Frequently Asked Questions (FAQ)

Q: Can the AS1PKHM3/84A directly replace the S1KFP without PCB modifications?

A: Electrical substitution is valid. However, the package change from SOD-123H to DO-220AA (SMP) requires PCB footprint verification. Physical dimensions and pin spacing differ between these packages. PCB layout compatibility assessment is necessary before component placement.

Q: What is the significance of the S1KFP being marked "Not For New Designs"?

A: This designation indicates the S1KFP has been superseded in onsemi's product portfolio. While existing inventory may be available, the manufacturer does not recommend this part for new circuit designs. The AS1PKHM3/84A, classified as Active, is the appropriate choice for new applications.

Q: Are the electrical performance characteristics of the AS1PKHM3/84A superior to the S1KFP?

A: The AS1PKHM3/84A demonstrates improved forward voltage characteristics (1.15V @ 1.5A versus 1.3V @ 1.2A), resulting in lower power dissipation. Current capacity is higher (1.5A versus 1.2A). Reverse recovery time and leakage current specifications are identical. The extended operating temperature range (-55°C to 175°C) provides additional thermal headroom.

Q: Do both devices meet automotive qualification requirements?

A: Yes. Both the S1KFP and AS1PKHM3/84A carry AEC-Q101 automotive qualification and are suitable for automotive applications requiring this certification.

Q: What is the difference between SOD-123H and DO-220AA packaging?

A: SOD-123H and DO-220AA are distinct surface mount package formats with different physical dimensions and footprints. SOD-123H is a smaller package, while DO-220AA (SMP) is larger. Component selection must account for available PCB space and assembly equipment compatibility.

Q: Are there any compliance or regulatory differences between these parts?

A: Both devices are ROHS3 compliant and REACH unaffected. Regulatory compliance is equivalent. Both carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: What is the moisture sensitivity level for these diodes?

A: Both the S1KFP and AS1PKHM3/84A have a Moisture Sensitivity Level (MSL) of 1, indicating unlimited shelf life without special moisture control measures.