Equivalent & Substitute Parts for SS38 Schottky Diode

Part Overview

The onsemi SS38 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. 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 the SS38 specification must be maintained or where compatible alternatives can fulfill the same circuit function.

Key Parameters

Parameter	Value	Unit
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
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS38 Schottky diode is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must be ≥ 80 V
Current - Average Rectified (Io): Must be ≥ 3 A
Technology: Schottky (fast recovery rectifier)
Package / Case: DO-214AB, SMC (mechanical and thermal compatibility)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Lower values indicate improved efficiency; values up to 850 mV are acceptable
Current - Reverse Leakage @ Vr: Lower values indicate superior performance; values up to 500 µA are acceptable
Operating Temperature - Junction: Must support the application's thermal requirements
RoHS and REACH compliance status for regulatory adherence

Parts are grouped as Direct Equivalents when all primary criteria match exactly. Parts are grouped as Compatible Substitutes when primary criteria are met or exceeded, with minor variations in secondary parameters that do not degrade circuit performance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [mV]	Reverse Leakage @ Vr [µA]	Tj (°C)	Package	Product Status	RoHS
SS38	onsemi	80	3	850	500 @ 80V	-55 to 150	DO-214AB, SMC	Not For New Designs	ROHS3
SK38-TP	Micro Commercial Co	80	3	850	500 @ 80V	-55 to 150	DO-214AB, SMC	Not For New Designs	ROHS3
B380-13-F	Diodes Incorporated	80	3	790	500 @ 80V	-55 to 125	DO-214AB, SMC	Active	ROHS3
B380Q-13-F	Diodes Incorporated	80	3	790	500 @ 80V	-55 to 125	DO-214AB, SMC	Active	ROHS3
HSM380J/TR13	Microchip Technology	80	3	810	100 @ 80V	-55 to 175	DO-214AB, SMC	Active	RoHS non-compliant
SS3H9-E3/57T	Vishay General Semiconductor	90	3	800	20 @ 90V	-65 to 175	DO-214AB, SMC	Active	ROHS3
B370-13-F	Diodes Incorporated	70	3	790	500 @ 70V	-55 to 125	DO-214AB, SMC	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Identical Electrical and Mechanical Specifications):

SK38-TP (Micro Commercial Co) is a direct equivalent to the SS38. Both parts share identical voltage, current, forward voltage, and reverse leakage specifications. SK38-TP is available in Tape & Reel packaging, whereas SS38 is available in Cut Tape & Digi-Reel format. Both are classified as "Not For New Designs" and carry ROHS3 compliance. Selection between SS38 and SK38-TP depends on packaging format availability and inventory requirements.

Active Production Substitutes (Recommended for New Designs and Ongoing Support):

B380-13-F and B380Q-13-F (Diodes Incorporated) are active production alternatives that meet or exceed all primary electrical criteria. Both maintain 80 V reverse voltage and 3 A current ratings with improved forward voltage characteristics (790 mV vs. 850 mV), resulting in lower power dissipation. B380Q-13-F carries AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications. Operating temperature range is -55°C to 125°C, which is adequate for most industrial and commercial applications. ROHS3 compliance is maintained.

HSM380J/TR13 (Microchip Technology) is an active production part with identical voltage and current ratings. It features superior reverse leakage performance (100 µA vs. 500 µA) and extended operating temperature range (-55°C to 175°C). However, this part is RoHS non-compliant and should be selected only when RoHS exemption is permissible or when extended temperature performance is critical.

SS3H9-E3/57T (Vishay General Semiconductor) exceeds the SS38 specification with 90 V reverse voltage rating and superior reverse leakage (20 µA). It supports extended temperature range (-65°C to 175°C) and is ROHS3 compliant. This part is suitable for applications requiring higher voltage margin or enhanced thermal performance.

Lower Voltage Alternative (Application-Dependent):

B370-13-F (Diodes Incorporated) is rated for 70 V reverse voltage, which is below the SS38 specification. This part is suitable only for applications where the circuit operates at voltages below 70 V and where the lower voltage rating does not compromise system safety margins.

Frequently Asked Questions (FAQ)

Q1: Can I use B380-13-F as a direct replacement for SS38 in production?

A: B380-13-F meets all primary electrical criteria (80 V, 3 A, Schottky technology, DO-214AB package) and is an active production part. The forward voltage is lower (790 mV vs. 850 mV), which improves efficiency. However, the operating temperature range is narrower (-55°C to 125°C vs. -55°C to 150°C). Verify that your application does not require operation above 125°C junction temperature. If thermal performance is not a constraint, B380-13-F is a suitable substitute.

Q2: What is the difference between B380-13-F and B380Q-13-F?

A: Both parts have identical electrical specifications. B380Q-13-F carries AEC-Q101 automotive qualification, indicating it meets automotive reliability and quality standards. Select B380Q-13-F for automotive, aerospace, or other high-reliability applications. B380-13-F is suitable for general industrial and commercial use.

Q3: Why is HSM380J/TR13 marked as RoHS non-compliant?

A: HSM380J/TR13 does not meet RoHS (Restriction of Hazardous Substances) directives. If your application or market requires RoHS compliance, select an alternative such as B380-13-F, B380Q-13-F, or SS3H9-E3/57T, all of which are ROHS3 compliant.

Q4: Can I use SS3H9-E3/57T instead of SS38?

A: Yes. SS3H9-E3/57T exceeds the SS38 specification with 90 V reverse voltage (vs. 80 V) and superior reverse leakage performance (20 µA vs. 500 µA). It is ROHS3 compliant and supports extended temperature range (-65°C to 175°C). This part is suitable for applications requiring higher voltage margin or enhanced performance. No circuit modifications are required.

Q5: Is B370-13-F a suitable substitute for SS38?

A: B370-13-F has a lower reverse voltage rating (70 V vs. 80 V). It is suitable only if your circuit operates at voltages below 70 V and if the lower voltage rating provides adequate safety margin. For circuits designed for 80 V operation, B370-13-F is not recommended.

Q6: What packaging formats are available for these substitutes?

A: SS38 is available in Cut Tape (CT) & Digi-Reel format. SK38-TP is available in Tape & Reel (TR). B380-13-F and B370-13-F are available in Cut Tape & Digi-Reel. B380Q-13-F, HSM380J/TR13, and SS3H9-E3/57T are available in Tape & Reel. Verify packaging compatibility with your assembly process before selection.

Q7: Which substitute offers the best performance improvement over SS38?

A: SS3H9-E3/57T provides the most significant performance improvement with 90 V voltage rating, superior reverse leakage (20 µA), and extended temperature range (-65°C to 175°C). For applications prioritizing lower forward voltage and active production status, B380-13-F or B380Q-13-F are optimal choices with 790 mV forward voltage and ROHS3 compliance.

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