SK38A-LTP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK38A-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 80V DC reverse voltage and 3A average rectified current in a DO-214AC (SMA) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The part is supplied in Tape & Reel (TR) packaging with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Due to its obsolescence status, equivalent and substitute parts are necessary for ongoing production support, maintenance applications, and design continuity where the SK38A-LTP specifications remain functionally acceptable.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	80	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) Maximum @ If	850 mV @ 3 A	mV @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 80 V
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-50°C to 125°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SK38A-LTP is determined by the following critical parameters:

Parametric Equivalents share identical electrical specifications across voltage rating (80V), current rating (3A), forward voltage drop (850 mV @ 3A), and reverse leakage characteristics (500 µA @ 80V). These parts differ only in packaging format (Tape & Reel versus Cut Tape) and product status.

Similar Substitutes maintain the same voltage rating (80V) and package form factor (DO-214AC, SMA) but operate at reduced current ratings (1A instead of 3A). These parts are suitable only for applications where the circuit current requirement does not exceed 1A. Forward voltage characteristics and reverse leakage specifications may vary within acceptable ranges for Schottky diode technology.

The allowed substitution parameters are:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 80V
Package / Case: Must be DO-214AC or SMA compatible
Technology: Must be Schottky
Current - Average Rectified (Io): Must meet or exceed circuit requirement
Mounting Type: Must be Surface Mount

Parameter Comparison

Parameter	SK38A-LTP (Main)	SK38A-TP (Parametric Equivalent)	B180-13-F (Similar)	SS18 (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)	3 A	3 A	1 A	1 A
Voltage - Forward (Vf) Max @ If	850 mV @ 3 A	850 mV @ 3 A	790 mV @ 1 A	850 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	500 µA @ 80 V	500 µA @ 80 V	500 µA @ 80 V	200 µA @ 80 V
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
Operating Temperature - Junction	-50°C to 125°C	-50°C to 125°C	-65°C to 150°C	-65°C to 125°C
Product Status	Not For New Designs	Obsolete	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Parametric Equivalence (SK38A-TP):

The SK38A-TP is a direct parametric equivalent to the SK38A-LTP, maintaining identical electrical performance across all critical specifications: 80V reverse voltage, 3A current rating, 850 mV forward voltage drop, and 500 µA reverse leakage. The only functional difference is packaging format (Cut Tape versus Tape & Reel). This part is suitable for direct substitution in applications requiring the full 3A current capacity. However, SK38A-TP carries an "Obsolete" product status, indicating limited future availability. Selection of this part should be based on immediate inventory requirements only.

For Similar Substitution (B180-13-F or SS18):

The B180-13-F and SS18 are current-limited substitutes rated for 1A operation instead of 3A. These parts are suitable only for circuits where the maximum operating current does not exceed 1A. The B180-13-F, manufactured by Diodes Incorporated, carries "Active" product status and represents the most viable long-term substitute for new production support. The SS18, manufactured by onsemi, carries "Not For New Designs" status and should be considered only for legacy system maintenance.

Compliance Considerations:

All listed parts maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Packaging and Availability:

The SK38A-LTP is supplied in Tape & Reel format with 4,700 pieces in current inventory. The SK38A-TP is available in Cut Tape format with 2,200 pieces. The B180-13-F offers the highest inventory availability at 25,200 pieces in Tape & Reel format. The SS18 is available in both Cut Tape and Digi-Reel® formats with 5,150 pieces in stock.

Frequently Asked Questions (FAQ)

Q: Can the SK38A-TP be used as a direct replacement for the SK38A-LTP?

A: Yes. The SK38A-TP is a parametric equivalent with identical electrical specifications. The only difference is packaging format (Cut Tape versus Tape & Reel). Both parts are rated for 80V, 3A, and 850 mV forward voltage. Verify that your assembly equipment can accommodate Cut Tape format if selecting SK38A-TP.

Q: Can I use the B180-13-F or SS18 in place of the SK38A-LTP?

A: Only if your circuit operates at 1A or less. The B180-13-F and SS18 are rated for 1A maximum current, compared to the SK38A-LTP's 3A rating. If your application requires the full 3A capacity, these parts are not suitable. If your circuit operates below 1A, these parts are electrically compatible at the same 80V voltage rating and DO-214AC package form factor.

Q: What is the difference between the B180-13-F and SS18?

A: Both parts are rated for 80V, 1A operation in DO-214AC (SMA) packages. The B180-13-F has a forward voltage of 790 mV @ 1A and is manufactured by Diodes Incorporated with "Active" product status. The SS18 has a forward voltage of 850 mV @ 1A and is manufactured by onsemi with "Not For New Designs" status. The B180-13-F offers superior long-term availability and lower forward voltage characteristics.

Q: Why is the SK38A-LTP marked "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. Existing inventory remains available for legacy system support and maintenance. For new designs, the B180-13-F (if 1A capacity is sufficient) or equivalent active-status 3A Schottky diodes should be evaluated.

Q: Are there any temperature rating differences between these parts?

A: Yes. The SK38A-LTP and SK38A-TP operate from -50°C to 125°C junction temperature. The B180-13-F extends this range to -65°C to 150°C, providing wider operating temperature coverage. The SS18 operates from -65°C to 125°C. If your application requires operation below -50°C or above 125°C, the B180-13-F is the only suitable option among these substitutes.

Q: Do all these parts have the same reverse leakage characteristics?

A: No. The SK38A-LTP, SK38A-TP, and B180-13-F all specify 500 µA reverse leakage @ 80V. The SS18 specifies 200 µA reverse leakage @ 80V, representing lower leakage current. For applications sensitive to reverse leakage, the SS18 offers improved performance, though this advantage is offset by its "Not For New Designs" status.

Q: What packaging formats are available for each part?

A: SK38A-LTP is supplied in Tape & Reel (TR) format. SK38A-TP is supplied in Cut Tape (CT) format. B180-13-F is supplied in Tape & Reel (TR) format. SS18 is supplied in both Cut Tape (CT) and Digi-Reel® formats. Verify your assembly equipment compatibility with the selected packaging format before procurement.

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