SS19FA Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS19FA is a Schottky rectifier diode manufactured by onsemi, rated for 90V DC reverse voltage and 1A average rectified current in a surface mount SOD-123FA package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product portfolio. Organizations requiring functional equivalents for existing applications, legacy system support, or design continuity must identify substitute components that maintain electrical and mechanical compatibility within the specified parameter ranges.

Substiute Parts

SS19FA

onsemiIn Stock: 23301SS19FA Datasheet

Current PartRFQ

SS1FH10HM3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 130271SS1FH10HM3/H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the SS19FA must satisfy the following criteria based on allowed electrical and mechanical parameters:

Electrical Compatibility Requirements:

• Voltage - DC Reverse (Vr) rating must equal or exceed 90V
• Current - Average Rectified (Io) rating must equal or exceed 1A
• Voltage - Forward (Vf) must not exceed 800 mV @ 1A
• Fast Recovery speed specification ≤ 500ns, > 200mA (Io)
• Technology classification: Schottky diode
• Reverse leakage current must be acceptable for the application circuit

Mechanical & Compliance Requirements:

• Mounting Type: Surface Mount
• Grade: Automotive
• Qualification: AEC-Q101
• RoHS3 Compliance
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• Package compatibility or functional equivalence in surface mount form factor

The substitute part SS1FH10HM3/H meets these criteria with the following characteristics: 100V DC reverse voltage rating (exceeds 90V requirement), 1A average rectified current (meets requirement), 800 mV forward voltage @ 1A (meets requirement), fast recovery speed specification, automotive grade, AEC-Q101 qualification, and ROHS3 compliance. The package form factor differs (DO-219AB versus SOD-123W), requiring PCB layout verification for mechanical fit.

Parameter Comparison

Engineering Selection Recommendations

Electrical Performance: The SS1FH10HM3/H substitute component provides equivalent or superior electrical performance across all critical parameters. The 100V reverse voltage rating exceeds the 90V requirement of the original SS19FA, providing additional design margin. Forward voltage characteristics remain identical at 800 mV @ 1A. Fast recovery speed specifications are equivalent. Reverse leakage current is superior (5 µA @ 100V versus 50 µA @ 90V), indicating improved device quality. Capacitance is marginally higher (70 pF versus 55 pF), which may require circuit evaluation in high-frequency applications.

Compliance & Qualification: Both components maintain automotive grade classification and AEC-Q101 qualification, ensuring suitability for automotive applications. Both are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating no special handling requirements. The substitute component supports an extended operating temperature range (-55°C to 175°C versus -55°C to 150°C), providing additional thermal margin.

Package Consideration: The primary distinction between these components is the package form factor. The SS19FA uses SOD-123W packaging, while the SS1FH10HM3/H uses DO-219AB (SMF) packaging. Both are surface mount technologies suitable for automated assembly. PCB layout and footprint compatibility must be verified before component selection, as the physical dimensions and lead configurations differ between these package types.

Product Status: The SS19FA is designated "Not For New Designs," indicating onsemi has discontinued active development and marketing of this component. The SS1FH10HM3/H is classified as "Active," confirming ongoing manufacturer support, availability, and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the SS1FH10HM3/H directly replace the SS19FA without PCB modifications?

A: Electrical substitution is valid based on parameter compatibility. However, the package form factor differs (DO-219AB versus SOD-123W). Direct PCB replacement without footprint modification is not possible. PCB layout redesign or adapter solutions are required.

Q: What is the significance of the higher reverse voltage rating (100V vs. 90V) on the substitute part?

A: The 100V rating on the SS1FH10HM3/H exceeds the 90V requirement of the original SS19FA. This provides additional design margin and protection against voltage transients. The component remains fully compatible with circuits designed for 90V operation.

Q: How does the lower reverse leakage current (5 µA vs. 50 µA) affect circuit performance?

A: Lower reverse leakage current indicates superior device quality and reduced parasitic current paths. This generally improves circuit efficiency and reduces power dissipation, particularly in low-current or precision applications. The substitute component is advantageous in this regard.

Q: Is the slightly higher capacitance (70 pF vs. 55 pF) a concern?

A: Capacitance differences of this magnitude (15 pF) are typically negligible in most rectifier applications. Evaluation is necessary only in high-frequency switching circuits where junction capacitance significantly affects performance. Standard rectifier applications are unaffected.

Q: Are both components suitable for automotive applications?

A: Yes. Both the SS19FA and SS1FH10HM3/H carry automotive grade classification and AEC-Q101 qualification, confirming suitability for automotive environments and compliance with automotive quality standards.

Q: What is the difference between SOD-123W and DO-219AB packages?

A: SOD-123W and DO-219AB are distinct surface mount package types with different physical dimensions, lead configurations, and PCB footprints. Both are industry-standard packages, but they are not mechanically interchangeable. Footprint verification and potential PCB redesign are required for substitution.

Q: Does the extended temperature range (-55°C to 175°C vs. -55°C to 150°C) provide any advantage?

A: The extended upper temperature limit of 175°C on the SS1FH10HM3/H provides additional thermal margin compared to the 150°C limit of the SS19FA. This is advantageous in high-temperature environments or applications with elevated junction temperatures.

Q: Are there any supply chain or availability differences between these components?

A: The SS19FA is designated "Not For New Designs," indicating limited ongoing support from onsemi. The SS1FH10HM3/H is classified as "Active" with significantly higher inventory levels (130,217 pcs versus 23,200 pcs), indicating superior long-term availability and supply chain continuity.

Q: What compliance certifications apply to both components?

A: Both components are ROHS3 compliant, carry AEC-Q101 automotive qualification, and are classified as REACH Unaffected. Both maintain MSL 1 (Unlimited) moisture sensitivity ratings, requiring no special storage or handling procedures.