SK18-TP Equivalent & Substitute Parts

Part Overview

The SK18-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 80 V DC reverse voltage and 1 A average rectified current in a DO-214AA (HSMB) surface mount 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 diode specification.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	80 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 80 V
Technology	Schottky
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SK18-TP are classified based on electrical parameter compatibility and package form factor. The primary substitution criteria are:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 80 V
Current - Average Rectified (Io): 1 A
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Package Compatibility:

Primary: DO-214AA, SMB (exact match)
Secondary: DO-214AC, SMA (alternative surface mount package with same footprint class)

Compliance Requirements:

RoHS3 Compliant
MSL 1 (Unlimited)

Parts are grouped into three categories: Parametric Equivalents (identical electrical specifications and primary package), Similar Parts (matching electrical specifications with alternative package variants), and Cross-Manufacturer Alternatives (equivalent performance from different manufacturers).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package / Case	Product Status	Operating Temp (Junction)
SK18-TP	Micro Commercial Co	80 V	1 A	850 mV @ 1 A	500 µA @ 80 V	DO-214AA, SMB	Obsolete	-55°C ~ 125°C
SK18-LTP	Micro Commercial Co	80 V	1 A	850 mV @ 1 A	500 µA @ 80 V	DO-214AA, SMB	Not For New Designs	-55°C ~ 125°C
SK18-TP (SMBSR108)	Micro Commercial Co	80 V	1 A	850 mV @ 1 A	500 µA @ 80 V	DO-214AA, SMB	Active	-55°C ~ 125°C
B180B-13-F	Diodes Incorporated	80 V	1 A	790 mV @ 1 A	500 µA @ 80 V	DO-214AA, SMB	Active	-65°C ~ 150°C
SS18	onsemi	80 V	1 A	850 mV @ 1 A	200 µA @ 80 V	DO-214AC, SMA	Not For New Designs	-65°C ~ 125°C
SK18	Diotec Semiconductor	80 V	1 A	850 mV @ 1 A	200 µA @ 80 V	DO-214AC, SMA	Active	-50°C ~ 150°C

Engineering Selection Recommendations

Primary Recommendation: SK18-TP (SMBSR108)

The SK18-TP (SMBSR108) variant from Micro Commercial Co is the preferred substitute. This part maintains identical electrical specifications to the original SK18-TP, operates in the Active product status category, and is available in the same DO-214AA, SMB package. It provides direct compatibility with existing PCB layouts and assembly processes. RoHS3 compliance and MSL 1 rating are maintained.

Secondary Recommendation: B180B-13-F

The B180B-13-F from Diodes Incorporated is an Active product offering equivalent electrical performance with a lower forward voltage (790 mV vs. 850 mV @ 1 A), which may provide improved thermal efficiency in power conversion applications. The extended operating temperature range (-65°C ~ 150°C) supports broader environmental applications. Package compatibility is maintained in DO-214AA, SMB form factor. RoHS3 compliance is confirmed.

Alternative Recommendation: SK18

The SK18 from Diotec Semiconductor is an Active product with identical electrical specifications to the original SK18-TP. This part operates in the DO-214AC, SMA package variant, which is mechanically compatible with SMB footprints in most PCB designs. The extended operating temperature range (-50°C ~ 150°C) and higher inventory availability (20,815 pcs) support long-term supply chain stability. RoHS3 compliance is confirmed.

Not Recommended for New Designs:

SK18-LTP and SS18 are classified as "Not For New Designs" and should not be selected for new product development, although they remain available for legacy system support and repair applications.

Frequently Asked Questions (FAQ)

Q: Can SK18-TP be directly replaced with SK18-TP (SMBSR108)?

A: Yes. Both parts are manufactured by Micro Commercial Co with identical electrical specifications (80 V, 1 A, 850 mV forward voltage, 500 µA reverse leakage) and the same DO-214AA, SMB package. The SMBSR108 designation indicates an Active product status variant of the same base design.

Q: What is the difference between DO-214AA (SMB) and DO-214AC (SMA) packages?

A: Both are surface mount packages with similar footprint dimensions suitable for automated assembly. DO-214AA (SMB) and DO-214AC (SMA) are mechanically compatible with standard SMB PCB landing patterns. The primary difference is the supplier device package designation; both support the same electrical performance requirements.

Q: Is B180B-13-F a suitable replacement despite the lower forward voltage specification?

A: Yes. The B180B-13-F meets all critical electrical parameters: 80 V reverse voltage, 1 A current rating, and fast recovery speed. The lower forward voltage (790 mV vs. 850 mV @ 1 A) represents improved performance characteristics and does not compromise compatibility. This part is Active and RoHS3 compliant.

Q: Why is SK18-LTP listed as "Not For New Designs"?

A: SK18-LTP is maintained in inventory for legacy system support and repair applications but is not recommended for new product development. For new designs, select from Active status parts: SK18-TP (SMBSR108), B180B-13-F, or SK18.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 Compliant certification, meeting regulatory requirements for hazardous substance restrictions in electronic components.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All listed parts maintain this rating, ensuring consistent reliability across supply chain operations.

Q: Can SK18 from Diotec Semiconductor be used in existing SK18-TP applications?

A: Yes. The SK18 from Diotec Semiconductor provides equivalent electrical performance with identical forward voltage (850 mV @ 1 A) and reverse voltage (80 V). The DO-214AC, SMA package is mechanically compatible with SMB PCB layouts. The extended operating temperature range (-50°C ~ 150°C) supports broader environmental conditions than the original SK18-TP (-55°C ~ 125°C).

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