SK38-TP Equivalent & Substitute Parts

Part Overview

The SK38-TP is a Schottky rectifier diode rated for 80 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. Manufactured by Micro Commercial Co, 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 supply of the original part number is unavailable.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	80 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 80 V
Package / Case	DO-214AB, SMC
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SK38-TP is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 80 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Technology: Schottky diode
Mounting Type: Surface Mount
Package compatibility: DO-214AB (SMC) or equivalent footprint

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current
Reverse leakage current
Operating temperature range
RoHS and regulatory compliance status

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical ratings and SMC package) and Parametric Equivalents (matching electrical performance with alternative package types).

Parameter Comparison

Parameter	SK38-TP (Main)	B370-13-F	B380-13-F	SK38/TR13	SS38
Manufacturer	Micro Commercial Co	Diodes Incorporated	Diodes Incorporated	Microsemi Corporation	MDD
Voltage - DC Reverse (Vr) (Max)	80 V	70 V	80 V	80 V	80 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	790 mV @ 3 A	790 mV @ 3 A	850 mV @ 3 A	Not specified
Speed	Fast Recovery ≤ 500ns, > 200mA	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 @ 70 V	500 µA @ 80 V	500 µA @ 80 V	500 µA @ 80 V
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AC, SMA
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 150°C
Product Status	Not For New Designs	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

B380-13-F (Diodes Incorporated) is the preferred direct substitute. It matches the SK38-TP in voltage rating (80 V), current rating (3 A), package type (DO-214AB, SMC), and reverse leakage characteristics. B380-13-F is in Active product status with ROHS3 compliance and offers superior forward voltage performance (790 mV vs. 850 mV at 3 A). Operating temperature range is -55°C to 125°C, which is narrower than the SK38-TP but suitable for most applications within this range.

SK38/TR13 (Microsemi Corporation) provides identical electrical specifications to the SK38-TP, including 80 V reverse voltage, 3 A current rating, and 850 mV forward voltage. This part maintains the same base product number (SK38) and is in Active status. However, SK38/TR13 is RoHS non-compliant, which may restrict use in regulated applications. Operating temperature range is -55°C to 125°C.

Parametric Equivalent (Alternative Package):

SS38 (MDD) is a parametric equivalent with matching 80 V reverse voltage and 3 A current rating. This part uses a DO-214AC (SMA) package instead of DO-214AB (SMC), resulting in a different footprint. SS38 is ROHS3 compliant and maintains the full -55°C to 150°C operating temperature range of the original SK38-TP. Use SS38 only when PCB layout can accommodate the SMA package or when footprint conversion is acceptable.

Not Recommended:

B370-13-F (Diodes Incorporated) has a reduced reverse voltage rating of 70 V, which is below the SK38-TP specification of 80 V. This part is unsuitable for applications requiring the full 80 V rating and should not be used as a substitute.

Frequently Asked Questions (FAQ)

Q: Can B380-13-F directly replace SK38-TP in existing designs?

A: B380-13-F is electrically compatible as a direct substitute for the SK38-TP. Both parts share the same 80 V reverse voltage, 3 A current rating, DO-214AB (SMC) package, and fast recovery characteristics. The primary difference is the forward voltage specification (790 mV vs. 850 mV at 3 A), which represents improved performance. Operating temperature range differs (-55°C to 125°C for B380-13-F vs. -55°C to 150°C for SK38-TP); verify that your application does not require operation above 125°C junction temperature.

Q: Why is B370-13-F listed as a substitute if it has a lower voltage rating?

A: B370-13-F is listed in the original substitute field but is not recommended for direct replacement. The 70 V reverse voltage rating is insufficient for applications designed around the SK38-TP's 80 V specification. Use B370-13-F only in applications where the circuit operates at 70 V or below.

Q: What is the difference between the SMC and SMA packages?

A: SMC (DO-214AB) and SMA (DO-214AC) are different surface mount package outlines. SMC is larger than SMA. The SS38 (SMA package) has a different footprint than the SK38-TP (SMC package). PCB layout modifications are required if substituting with SS38. Verify pad spacing and component placement before using SS38 as a replacement.

Q: Is SK38/TR13 a suitable replacement for new production?

A: SK38/TR13 is electrically equivalent to SK38-TP but carries RoHS non-compliant status. For applications subject to RoHS regulations or environmental compliance requirements, SK38/TR13 is not suitable. Use B380-13-F or SS38 instead, both of which are ROHS3 compliant.

Q: What is the significance of the "Not For New Designs" status on SK38-TP?

A: "Not For New Designs" indicates that the SK38-TP has reached end-of-life and is no longer recommended for new product development. Existing inventory may be available, but long-term supply is not guaranteed. For new designs, select from Active status parts such as B380-13-F or SS38.

Q: Can I use SS38 if my PCB is designed for SMC packages?

A: No. SS38 uses a DO-214AC (SMA) package, which has a different footprint than the DO-214AB (SMC) package. Direct substitution on an existing PCB designed for SMC is not possible without PCB modification. Use SS38 only if your design can accommodate the SMA package or if you perform footprint conversion.

Q: Are all substitute parts RoHS compliant?

A: B380-13-F and SS38 are ROHS3 compliant. SK38/TR13 is RoHS non-compliant. For applications requiring RoHS compliance, use B380-13-F (direct SMC package) or SS38 (SMA package alternative).

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