SS28 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS28 is a Schottky rectifier diode manufactured by onsemi, rated for 80 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary for applications requiring continued support, design flexibility, or component availability optimization.

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	400	µA @ 80 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65°C ~ 125°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS28 is determined by the following critical parameters:

Voltage Rating (Vr): The reverse voltage must equal or exceed 80 V to maintain circuit protection and reliability margins.

Current Rating (Io): The average rectified current must equal or exceed 2 A to handle the application's load requirements without thermal stress.

Package Type: All substitutes must use DO-214AA (SMB) surface mount packaging to ensure mechanical and electrical compatibility with existing PCB layouts.

Technology: All substitutes are Schottky diodes, maintaining the fast recovery characteristic (≤ 500ns) required for switching applications.

Forward Voltage (Vf): Forward voltage drop at rated current affects power dissipation and circuit efficiency. Substitutes with lower Vf values provide improved thermal performance.

Reverse Leakage Current: Lower reverse leakage improves circuit performance and reduces standby power consumption.

Substitute parts are grouped into three categories based on current rating capacity: 1 A devices (lower current applications), 2 A devices (direct equivalents), and 3 A devices (higher current capability).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status	Package
SS28	onsemi	80	2	850 @ 2A	400 @ 80V	125	Not For New Designs	DO-214AA, SMB
MBRS2H100T3G	onsemi	100	2	790 @ 2A	8 @ 100V	175	Active	DO-214AA, SMB
B180B-13-F	Diodes Incorporated	80	1	790 @ 1A	500 @ 80V	150	Active	DO-214AA, SMB
B180BQ-13-F	Diodes Incorporated	80	1	790 @ 1A	500 @ 80V	150	Active	DO-214AA, SMB
B280-13-F	Diodes Incorporated	80	2	790 @ 2A	7000 @ 80V	150	Active	DO-214AA, SMB
B280Q-13-F	Diodes Incorporated	80	2	790 @ 2A	7 @ 80V	150	Active	DO-214AA, SMB
B380B-13-F	Diodes Incorporated	80	3	790 @ 3A	500 @ 80V	150	Active	DO-214AA, SMB
SK38B-LTP	Micro Commercial Co	80	3	850 @ 3A	500 @ 80V	150	Not For New Designs	DO-214AA, SMB
SS2H9-E3/52T	Vishay General Semiconductor - Diodes Division	90	2	790 @ 2A	10 @ 90V	175	Active	DO-214AA, SMB

Engineering Selection Recommendations

Direct Equivalent (2 A Current Rating):

The B280Q-13-F (Diodes Incorporated) and SS2H9-E3/52T (Vishay) are the primary substitutes for the SS28. Both maintain the 2 A current rating and DO-214AA package. The B280Q-13-F is AEC-Q101 qualified for automotive applications and offers significantly lower reverse leakage (7 µA versus 400 µA). The SS2H9-E3/52T provides a higher voltage rating (90 V) and extended junction temperature range (-65°C to 175°C), with lower forward voltage (790 mV versus 850 mV) and minimal reverse leakage (10 µA).

Higher Current Capability (3 A Rating):

The B380B-13-F (Diodes Incorporated) and SK38B-LTP (Micro Commercial Co) provide 3 A current capacity in the same package. The B380B-13-F is an active product with lower reverse leakage (500 µA) and improved thermal performance. The SK38B-LTP matches the original forward voltage characteristic (850 mV) but carries "Not For New Designs" status.

Enhanced Voltage Rating (100 V):

The MBRS2H100T3G (onsemi) offers increased reverse voltage margin (100 V) with improved reverse leakage performance (8 µA) and extended temperature range (175°C maximum junction temperature). This part is suitable for applications requiring additional voltage headroom.

Lower Current Applications (1 A Rating):

The B180B-13-F and B180BQ-13-F (Diodes Incorporated) are suitable only for applications with maximum 1 A current requirements. The B180BQ-13-F includes AEC-Q101 automotive qualification.

All recommended substitutes maintain ROHS3 compliance, fast recovery characteristics, and surface mount DO-214AA packaging. Selection should prioritize active product status and compliance certifications appropriate to the application environment.

Frequently Asked Questions (FAQ)

Q: Can the SS28 be replaced with a 1 A rated diode such as B180B-13-F?

A: No. The SS28 is rated for 2 A average rectified current. Substituting a 1 A device would result in thermal stress and potential component failure. The substitute must equal or exceed the 2 A current rating.

Q: What is the difference between B280-13-F and B280Q-13-F?

A: Both parts are rated for 80 V and 2 A with identical forward voltage (790 mV @ 2A). The primary difference is reverse leakage current: B280-13-F has 7 mA leakage, while B280Q-13-F has 7 µA leakage. The B280Q-13-F also includes AEC-Q101 automotive qualification. For most applications, B280Q-13-F is the superior choice due to lower leakage.

Q: Is the MBRS2H100T3G a direct replacement for SS28?

A: The MBRS2H100T3G is functionally compatible but not a direct replacement. It provides higher voltage rating (100 V versus 80 V), lower forward voltage (790 mV versus 850 mV), significantly lower reverse leakage (8 µA versus 400 µA), and extended temperature range (175°C versus 125°C). It is suitable for applications where these enhanced characteristics provide benefit.

Q: Can I use a 3 A rated diode like B380B-13-F in place of the SS28?

A: Yes. The B380B-13-F is rated for 80 V and 3 A, exceeding the SS28 specifications. Higher current rating provides thermal margin and improved reliability. The package remains DO-214AA (SMB), ensuring mechanical compatibility.

Q: Why does the SS28 have "Not For New Designs" status?

A: This status indicates the manufacturer has superseded this part in their product line. Existing designs may continue using SS28 inventory, but new designs should select from active product alternatives such as MBRS2H100T3G, SS2H9-E3/52T, or B280Q-13-F.

Q: What is the significance of AEC-Q101 qualification on B180BQ-13-F and B280Q-13-F?

A: AEC-Q101 is an automotive electronics qualification standard. Parts bearing this qualification have undergone rigorous testing for automotive applications. If the application requires automotive-grade components, B180BQ-13-F or B280Q-13-F must be selected.

Q: How does forward voltage affect circuit performance?

A: Forward voltage (Vf) determines the voltage drop across the diode during conduction. Lower Vf reduces power dissipation and heat generation. The SS28 has 850 mV Vf, while most substitutes offer 790 mV. In high-current or thermally constrained applications, lower Vf improves efficiency and reduces cooling requirements.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts listed use DO-214AA (SMB) surface mount packaging, ensuring direct PCB compatibility with the SS28 footprint.

Q: What is reverse leakage current and why does it matter?

A: Reverse leakage current (Ir) is the small current that flows through the diode when reverse biased. Lower leakage reduces standby power consumption and improves circuit performance. The SS28 has 400 µA leakage; substitutes range from 7 µA to 500 µA depending on the part selected.

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