S1MFP Equivalent & Substitute Parts Reference

Part Overview

The S1MFP is a general-purpose rectifier diode manufactured by onsemi, rated for 1000 V DC reverse voltage and 1.2 A average rectified current in a surface mount SOD-123H package. This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. For applications requiring continued supply or design flexibility, equivalent substitute parts with matching or superior electrical characteristics are available from alternative manufacturers while maintaining automotive-grade qualification and AEC-Q101 compliance.

Substiute Parts

S1MFP

onsemiIn Stock: 12756S1MFP Datasheet

Current PartRFQ

AS1PMHM3/84A

Vishay General Semiconductor - Diodes DivisionIn Stock: 6458AS1PMHM3/84A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the S1MFP is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute part must maintain a minimum DC reverse voltage rating of 1000 V to ensure equivalent circuit protection and reliability in the intended application.

Current Rating: The substitute part must support a minimum average rectified current of 1.2 A. Parts with higher current ratings (such as 1.5 A) are acceptable as they provide design margin without compromising circuit function.

Reverse Recovery Time: The substitute part must match the standard recovery speed classification (>500 ns, >200 mA) to maintain switching characteristics and thermal performance in rectification circuits.

Reverse Leakage Current: The substitute part must not exceed 5 µA at 1000 V to ensure equivalent leakage performance and circuit reliability.

Package Compatibility: The substitute part must be surface mount technology. While the S1MFP uses SOD-123H packaging and the identified substitute uses DO-220AA (SMP) packaging, both are surface mount configurations suitable for automated assembly.

Automotive Qualification: The substitute part must carry AEC-Q101 qualification and automotive-grade designation to maintain compliance with automotive reliability standards.

RoHS and REACH Compliance: The substitute part must maintain ROHS3 compliance and REACH unaffected status to ensure regulatory alignment.

The AS1PMHM3/84A from Vishay General Semiconductor meets all substitution criteria with enhanced specifications in forward voltage and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The S1MFP carries a "Not For New Designs" status, indicating onsemi has discontinued active development and support for this component. For new applications or long-term supply assurance, the AS1PMHM3/84A represents an active product from Vishay General Semiconductor with ongoing manufacturer support.

Compliance and Certification: Both the S1MFP and AS1PMHM3/84A maintain identical automotive-grade designation and AEC-Q101 qualification, ensuring equivalent reliability standards for automotive and industrial applications. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Electrical Performance: The AS1PMHM3/84A provides superior forward voltage characteristics (1.15 V @ 1.5 A versus 1.3 V @ 1.2 A), resulting in lower power dissipation and improved thermal efficiency. The higher current rating (1.5 A versus 1.2 A) provides additional design margin without requiring circuit modification.

Temperature Range: The AS1PMHM3/84A supports an extended maximum junction temperature of 175°C compared to 150°C for the S1MFP, enabling operation in higher ambient temperature environments.

Package Transition: While the S1MFP uses SOD-123H packaging and the AS1PMHM3/84A uses DO-220AA (SMP) packaging, both are surface mount configurations. PCB layout and footprint modifications are required for package transition; however, both packages are standard surface mount technologies compatible with automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the AS1PMHM3/84A directly replace the S1MFP without circuit modification?

A: The AS1PMHM3/84A meets all critical electrical parameters (voltage, current, recovery time, leakage) required for functional equivalence. However, package transition from SOD-123H to DO-220AA (SMP) requires PCB footprint and layout modification. Circuit operation remains unchanged when proper footprint design is implemented.

Q: What is the significance of the "Not For New Designs" status on the S1MFP?

A: This status indicates that onsemi has concluded active development and support for the S1MFP. While existing inventory remains available, the manufacturer does not recommend this component for new circuit designs. The AS1PMHM3/84A, classified as "Active," represents the current generation equivalent with ongoing manufacturer support and supply continuity.

Q: Are both components suitable for automotive applications?

A: Yes. Both the S1MFP and AS1PMHM3/84A carry automotive-grade designation and AEC-Q101 qualification, meeting automotive reliability and qualification standards. Both maintain ROHS3 compliance and REACH unaffected status, satisfying current automotive regulatory requirements.

Q: How does the higher current rating of the AS1PMHM3/84A (1.5 A versus 1.2 A) affect substitution?

A: The higher current rating provides design margin and does not compromise circuit function. The substitute part can safely handle the original design current (1.2 A) with reduced stress and improved thermal performance. No circuit modification is required to accommodate the higher rating.

Q: What are the package differences between SOD-123H and DO-220AA (SMP)?

A: SOD-123H and DO-220AA (SMP) are both surface mount packages but have different physical dimensions and footprints. SOD-123H is a smaller, two-lead surface mount package, while DO-220AA (SMP) is a larger surface mount package. PCB redesign is necessary to accommodate the package transition, but both are standard surface mount technologies compatible with automated assembly.

Q: Does the lower forward voltage of the AS1PMHM3/84A provide any operational advantage?

A: Yes. The AS1PMHM3/84A exhibits lower forward voltage (1.15 V @ 1.5 A) compared to the S1MFP (1.3 V @ 1.2 A), resulting in reduced power dissipation during conduction. This characteristic improves thermal efficiency and reduces heat generation in the circuit, particularly beneficial in high-frequency or high-current rectification applications.

Q: Are there any temperature-related considerations when substituting these components?

A: The AS1PMHM3/84A supports a higher maximum junction temperature (175°C versus 150°C), enabling operation in elevated ambient temperature environments. This extended temperature range provides additional design flexibility for applications with thermal constraints or high-temperature operating conditions.