SK28-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK28-TP is a surface mount Schottky diode manufactured by Micro Commercial Co, rated for 80 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) package. This component is classified as Obsolete, indicating it is no longer in active production. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing manufacturing requirements for applications utilizing this rectifier diode.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	80	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 80 V	µA
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 125°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SK28-TP is determined by electrical and mechanical parameter equivalence within the Schottky diode rectifier category. The critical parameters governing substitutability are:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 80 V minimum
Current - Average Rectified (Io): 2 A minimum
Voltage - Forward (Vf) (Max) @ If: ≤ 850 mV @ 2 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Parameters:

Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount

Compliance Parameters:

RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

Substitute parts are classified into two categories:

Parametric Equivalent: SK28-LTP (Micro Commercial Co) — Identical electrical specifications and package, with identical base product number (SK28), differing only in product status and reverse leakage characteristics.

Similar Manufacturer Parts: B280-13-F (Diodes Incorporated) and SS28 (onsemi) — Meet or exceed all critical electrical parameters and package requirements, with variations in forward voltage, reverse leakage, capacitance, and operating temperature range.

Parameter Comparison

Parameter	SK28-TP (Main)	SK28-LTP (Parametric Equivalent)	B280-13-F (Similar)	SS28 (Similar)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Diodes Incorporated	onsemi
Voltage - DC Reverse (Vr) (Max)	80 V	80 V	80 V	80 V
Current - Average Rectified (Io)	2 A	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 2 A	850 mV @ 2 A	790 mV @ 2 A	850 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 80 V	1 mA @ 80 V	7 mA @ 80 V	400 µA @ 80 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C	-55°C ~ 125°C	-65°C ~ 150°C	-65°C ~ 125°C
Product Status	Obsolete	Not For New Designs	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Existing Designs (Maintenance & Repair):

SK28-LTP is the direct parametric equivalent and preferred substitute for SK28-TP. Both parts share identical electrical specifications, package configuration, and base product number (SK28). SK28-LTP maintains full compatibility with existing PCB layouts and circuit designs. Although SK28-LTP carries a "Not For New Designs" status, it is suitable for sustaining production and field replacement applications where the original SK28-TP is no longer available.

For New Designs:

B280-13-F (Diodes Incorporated) is the recommended substitute for new product development. This part is classified as Active, ensuring long-term supply chain availability and manufacturing support. B280-13-F meets or exceeds all critical electrical parameters: 80 V reverse voltage rating, 2 A current capacity, and fast recovery switching characteristics. The forward voltage of 790 mV @ 2 A is superior to the SK28-TP specification of 850 mV, resulting in lower power dissipation. The extended operating temperature range (-65°C ~ 150°C) provides additional thermal margin. All compliance certifications (ROHS3, REACH Unaffected) are equivalent.

Alternative Consideration:

SS28 (onsemi) is a secondary alternative meeting all critical electrical and mechanical requirements. However, its "Not For New Designs" status limits its suitability for new product development. SS28 is appropriate for sustaining production of existing designs where supply of SK28-LTP is constrained.

Frequently Asked Questions (FAQ)

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

A: Yes. SK28-LTP is a parametric equivalent with identical voltage rating (80 V), current rating (2 A), forward voltage (850 mV @ 2 A), switching speed, and package configuration (DO-214AA, SMB). Both parts share the same base product number (SK28) and are pin-compatible. No circuit modifications are required.

Q: What is the difference between SK28-LTP and B280-13-F?

A: Both parts meet the core electrical requirements (80 V, 2 A, fast recovery). Key differences are: (1) B280-13-F has lower forward voltage (790 mV vs. 850 mV @ 2 A), reducing power dissipation; (2) B280-13-F has an extended operating temperature range (-65°C ~ 150°C vs. -55°C ~ 125°C); (3) B280-13-F is Active status, ensuring long-term availability; (4) B280-13-F is manufactured by Diodes Incorporated rather than Micro Commercial Co. Both are ROHS3 compliant and use the same SMB package.

Q: Why is reverse leakage current different across substitute parts?

A: Reverse leakage current is a manufacturing characteristic that varies between manufacturers and production lots. SK28-TP specifies 500 µA @ 80 V, SK28-LTP specifies 1 mA @ 80 V, B280-13-F specifies 7 mA @ 80 V, and SS28 specifies 400 µA @ 80 V. All values remain within acceptable limits for Schottky diode rectifiers in this voltage and current class. Applications sensitive to leakage current should prioritize SS28 or SK28-TP.

Q: Are all substitute parts available in the same packaging format?

A: SK28-TP, SK28-LTP, and B280-13-F are all supplied in Tape & Reel (TR) packaging suitable for automated assembly. SS28 is supplied in Cut Tape (CT) & Digi-Reel® format. Both packaging formats are compatible with standard surface mount assembly equipment. Verify packaging availability with your supplier based on production volume requirements.

Q: Which substitute part should be selected for new product development?

A: B280-13-F is the recommended choice for new designs. It carries Active product status, ensuring availability throughout the product lifecycle. B280-13-F offers superior electrical performance (lower forward voltage), extended temperature range, and equivalent compliance certifications. SK28-LTP and SS28 are suitable only for sustaining production of existing designs due to their "Not For New Designs" status.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SK28-TP, SK28-LTP, B280-13-F, and SS28 are all ROHS3 Compliant and REACH Unaffected. All parts meet current environmental and regulatory requirements for commercial and industrial applications.

Q: What is the impact of forward voltage differences on circuit performance?

A: Forward voltage affects power dissipation and voltage drop across the diode. B280-13-F (790 mV @ 2 A) dissipates less power than SK28-TP (850 mV @ 2 A) by approximately 60 mV per diode. In high-current or thermally constrained applications, this difference may improve thermal performance. In low-power applications, the difference is negligible. Circuit simulation or thermal analysis is appropriate for applications where forward voltage drop is critical to performance.

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