SS22-LTP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS22-LTP is a surface mount Schottky rectifier diode manufactured by Micro Commercial Co, rated for 20V DC reverse voltage and 2A average rectified current in a DO-214AC (SMA) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original part is no longer readily available or where design flexibility permits component substitution within specified electrical and mechanical parameters.

Substiute Parts

SS22-LTP

Micro Commercial CoIn Stock: 6197SS22-LTP Datasheet

Current PartRFQ

SK22A

Good-Ark SemiconductorIn Stock: 7879SK22A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS22-LTP is determined by strict equivalence across the following critical parameters:

• Voltage Rating: Reverse voltage (Vr) must equal or exceed 20V
• Current Rating: Average rectified current (Io) must equal or exceed 2A
• Forward Voltage Drop: Vf at rated current must not exceed 550 mV @ 2A to maintain circuit performance
• Recovery Speed: Fast recovery characteristic (≤ 500ns, > 200mA) required for switching applications
• Package Compatibility: DO-214AC (SMA) surface mount package for PCB layout compatibility
• Temperature Range: Operating junction temperature range must support the application environment
• Technology Type: Schottky diode technology for low forward voltage characteristics

The SK22A manufactured by Good-Ark Semiconductor meets all these substitution criteria and is classified as an equivalent part.

Parameter Comparison

Engineering Selection Recommendations

The SK22A is a direct parametric equivalent to the SS22-LTP across all critical electrical and mechanical specifications. The SK22A offers the following advantages:

• Active Product Status: The SK22A is classified as an active product, ensuring continued availability and supply chain stability compared to the SS22-LTP, which is not recommended for new designs.
• Enhanced Leakage Performance: The SK22A exhibits lower reverse leakage current (200 µA vs. 500 µA @ 20V), resulting in reduced power dissipation and improved circuit efficiency.
• Reduced Capacitance: The SK22A has lower junction capacitance (200 pF vs. 230 pF @ 4V, 1MHz), beneficial for high-frequency switching applications.
• Extended Temperature Range: The SK22A supports an operating junction temperature range of -55 to 150°C, compared to -55 to 125°C for the SS22-LTP, providing additional thermal margin for demanding environments.
• Automotive Qualification: The SK22A carries AEC-Q101 automotive qualification and is designated as automotive grade, indicating compliance with automotive reliability and quality standards.
• Regulatory Compliance: Both parts maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity levels, ensuring compatibility with current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the SK22A be used as a direct replacement for the SS22-LTP in existing designs?

A: Yes. The SK22A meets all critical electrical parameters (20V reverse voltage, 2A current rating, 550 mV forward voltage drop, fast recovery speed) and uses the identical DO-214AC (SMA) surface mount package. No circuit modifications or PCB layout changes are required.

Q: What is the significance of the SS22-LTP being "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status and is no longer recommended for new product development. The SK22A, classified as an active product, is the appropriate choice for new designs and ongoing production.

Q: How do the reverse leakage current differences affect circuit performance?

A: The SK22A's lower reverse leakage current (200 µA vs. 500 µA @ 20V) reduces parasitic current paths and power dissipation. In low-power or precision applications, this improvement enhances overall circuit efficiency and reduces thermal load.

Q: Are there any temperature-related limitations when substituting the SK22A for the SS22-LTP?

A: No. The SK22A's extended operating temperature range (-55 to 150°C) encompasses the SS22-LTP's range (-55 to 125°C). The SK22A is suitable for applications across the full temperature envelope of the original part and beyond.

Q: What does AEC-Q101 qualification mean for the SK22A?

A: AEC-Q101 is an automotive industry standard qualification that certifies the SK22A has undergone rigorous reliability testing and quality assurance processes. This qualification is relevant for automotive and high-reliability applications but does not restrict use in non-automotive applications.

Q: Are the packaging and moisture sensitivity levels identical between the two parts?

A: Yes. Both the SS22-LTP and SK22A use the DO-214AC (SMA) surface mount package and carry MSL 1 (Unlimited) moisture sensitivity level ratings. Storage and handling requirements are identical.

Q: Does the lower capacitance of the SK22A provide any practical benefit?

A: Yes. The SK22A's reduced junction capacitance (200 pF vs. 230 pF @ 4V, 1MHz) results in lower parasitic capacitance effects, which is advantageous in high-frequency switching circuits, reducing switching losses and improving transient response.