SK28-LTP Equivalent & Substitute Parts

Part Overview

The SK28-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 80 V DC reverse voltage and 2 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where continued availability of the original part cannot be assured.

Substiute Parts

SK28-LTP

Micro Commercial CoIn Stock: 3198SK28-LTP Datasheet

Current PartRFQ

B280-13-F

Diodes IncorporatedIn Stock: 16069B280-13-F Datasheet

SimilarRFQ

SS28

onsemiIn Stock: 6097SS28 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SK28-LTP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): 80 V
• Current - Average Rectified (Io): 2 A
• Technology: Schottky
• Package / Case: DO-214AA, SMB (surface mount)
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

• Voltage - Forward (Vf) (Max) @ If: Must not exceed 850 mV @ 2 A
• Operating Temperature - Junction: Must encompass or exceed -55°C ~ 125°C range
• Current - Reverse Leakage @ Vr: Lower values indicate superior performance
• RoHS and REACH compliance status

Parts meeting all primary criteria are classified as direct substitutes. Variations in forward voltage, reverse leakage current, and capacitance are acceptable within the specified electrical ratings, provided the part maintains functional equivalence in the application circuit.

Parameter Comparison

Engineering Selection Recommendations

B280-13-F (Diodes Incorporated) is the preferred substitute for the SK28-LTP. This part maintains electrical equivalence across all primary parameters while offering the advantage of "Active" product status, ensuring continued availability and manufacturing support. The B280-13-F exhibits superior forward voltage performance (790 mV vs. 850 mV @ 2 A) and an extended operating temperature range (-65°C ~ 150°C vs. -55°C ~ 125°C), providing enhanced thermal margin. ROHS3 compliance and unlimited MSL rating confirm regulatory and environmental compatibility.

SS28 (onsemi) serves as a secondary substitute option. This part matches the SK28-LTP in voltage, current, and forward voltage specifications. However, SS28 carries "Not For New Designs" status, similar to the main part, which may limit long-term availability. The reverse leakage current (400 µA @ 80 V) is intermediate between the main part and B280-13-F, and capacitance data is not provided. SS28 maintains ROHS3 compliance and unlimited MSL rating.

Both substitute parts are surface mount devices in DO-214AA (SMB) packages, ensuring mechanical and thermal compatibility with existing PCB layouts designed for the SK28-LTP.

Frequently Asked Questions (FAQ)

Q: Can B280-13-F be used as a direct replacement for SK28-LTP in existing designs?

A: Yes. Both parts meet the primary electrical specifications: 80 V reverse voltage, 2 A average rectified current, fast recovery Schottky technology, and DO-214AA (SMB) surface mount package. The B280-13-F exhibits lower forward voltage (790 mV vs. 850 mV @ 2 A), which is advantageous for efficiency. No circuit modifications are required.

Q: What is the difference between B280-13-F and SS28?

A: Both are 80 V, 2 A Schottky diodes in SMB packages. Key differences include: B280-13-F has lower forward voltage (790 mV vs. 850 mV), lower reverse leakage (7 mA vs. 400 µA), higher capacitance (75pF vs. not specified), and "Active" product status. SS28 matches the SK28-LTP forward voltage exactly but carries "Not For New Designs" status.

Q: Does the higher capacitance of B280-13-F (75pF vs. 50pF) affect circuit performance?

A: Capacitance differences of this magnitude (50pF to 75pF @ 4V, 1MHz) are typically negligible in rectifier applications. Circuit impact depends on switching frequency and impedance. For DC rectification and low-frequency applications, this variation is not significant.

Q: Are all three parts (SK28-LTP, B280-13-F, SS28) pin-compatible?

A: Yes. All three parts use the DO-214AA (SMB) package with identical pin configuration and footprint. PCB layout and soldering procedures remain unchanged.

Q: Which substitute should be selected for new designs?

A: B280-13-F is the appropriate choice for new designs. It carries "Active" product status, ensuring long-term availability and manufacturing support. Both SK28-LTP and SS28 are classified "Not For New Designs" and should not be specified for new applications.

Q: What is the operating temperature range difference, and does it matter?

A: B280-13-F operates from -65°C ~ 150°C, while SK28-LTP operates from -55°C ~ 125°C. The B280-13-F provides 10°C lower minimum and 25°C higher maximum temperature capability. For applications operating within the SK28-LTP range, this difference is not critical. For extended temperature environments, B280-13-F offers superior margin.

Q: Are there compliance or regulatory differences between the three parts?

A: No. All three parts are ROHS3 compliant, REACH unaffected, and carry unlimited MSL rating (1). Regulatory and environmental compliance is equivalent across all three options.