Equivalent & Substitute Parts for 1SS389,H3F Schottky Diode

Part Overview

The 1SS389,H3F is a Schottky diode manufactured by Toshiba Semiconductor and Storage, rated for 40 V DC reverse voltage with 100 mA average rectified current. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and production continuity. The part is designed for surface mount applications in small signal switching circuits where fast recovery and low forward voltage drop are required.

Substiute Parts

1SS389,H3F

Toshiba Semiconductor and StorageIn Stock: 10471SS389,H3F Datasheet

Current PartRFQ

CES388,L3F

Toshiba Semiconductor and StorageIn Stock: 5248CES388,L3F Datasheet

DirectRFQ

1SS388-TP

Micro Commercial CoIn Stock: 10181SS388-TP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SS389,H3F is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 100 mA
• Technology: Schottky
• Mounting Type: Surface Mount
• Package / Case: SC-79, SOD-523
• Operating Temperature - Junction (Max): 125°C

Acceptable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Specified at different current levels (50 mA or 100 mA) with identical maximum value of 600 mV
• Current - Reverse Leakage @ Vr: Specified at different voltage levels (10 V or 40 V) with identical maximum value of 5 µA
• Supplier Device Package designation: ESC or SOD-523 (both reference the same physical package)

Two substitute parts meet these criteria: CES388,L3F (Toshiba Semiconductor and Storage, Active status) and 1SS388-TP (Micro Commercial Co, Active status).

Parameter Comparison

Engineering Selection Recommendations

CES388,L3F (Toshiba Semiconductor and Storage)

This part is a direct substitute for the obsolete 1SS389,H3F. Both are manufactured by Toshiba Semiconductor and Storage and share identical electrical specifications. CES388,L3F carries Active product status with 5200 units in stock. The part is ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements. Packaging is available in Cut Tape (CT) and Digi-Reel® formats. Forward voltage is specified at 100 mA instead of 50 mA, and reverse leakage is specified at 40 V instead of 10 V; both measurements remain within the 600 mV and 5 µA maximum limits respectively.

1SS388-TP (Micro Commercial Co)

This part is a parametric equivalent manufactured by Micro Commercial Co. All electrical specifications match the 1SS389,H3F exactly, including forward voltage specification at 50 mA and reverse leakage specification at 10 V. The part carries Active product status with 956 units in stock. It is ROHS3 Compliant and REACH Unaffected. Packaging is supplied in Tape & Reel (TR) format. The supplier device package designation is SOD-523 rather than ESC, though both reference the same physical package configuration.

Both substitute parts are suitable for direct replacement in applications requiring a 40 V, 100 mA Schottky diode in surface mount SC-79/SOD-523 packaging. Selection between CES388,L3F and 1SS388-TP depends on packaging format requirements (Digi-Reel versus Tape & Reel) and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can CES388,L3F be used as a direct replacement for 1SS389,H3F?

A: Yes. CES388,L3F meets all electrical and mechanical specifications of the 1SS389,H3F. Both are 40 V, 100 mA Schottky diodes in SC-79/SOD-523 surface mount packages with identical maximum ratings for forward voltage, reverse leakage, and capacitance. CES388,L3F is manufactured by the same supplier (Toshiba Semiconductor and Storage) and carries Active product status.

Q: What is the difference between the forward voltage specifications in the parameter comparison?

A: The 1SS389,H3F and 1SS388-TP specify forward voltage at 50 mA, while CES388,L3F specifies it at 100 mA. All three parts have an identical maximum forward voltage rating of 600 mV. The difference in measurement current does not affect substitution compatibility, as the maximum rating remains constant.

Q: Why are reverse leakage specifications different between the substitute parts?

A: The 1SS389,H3F and 1SS388-TP specify reverse leakage at 10 V, while CES388,L3F specifies it at 40 V. All three parts have an identical maximum reverse leakage rating of 5 µA. The difference in measurement voltage does not affect substitution compatibility, as the maximum rating remains constant.

Q: Are there packaging format differences between the substitute parts?

A: Yes. CES388,L3F is supplied in Cut Tape (CT) and Digi-Reel® formats, while 1SS388-TP is supplied in Tape & Reel (TR) format. Both parts use the same physical SC-79/SOD-523 package. Selection depends on your assembly process requirements and tape format compatibility.

Q: Do both substitute parts meet current regulatory compliance standards?

A: Yes. Both CES388,L3F and 1SS388-TP are ROHS3 Compliant and REACH Unaffected. The original 1SS389,H3F does not specify these compliance statuses, as it is classified as obsolete.

Q: What is the inventory status for each substitute part?

A: CES388,L3F has 5200 units in stock. 1SS388-TP has 956 units in stock. Both are classified as Active products with current availability.

Q: Are the SC-79 and SOD-523 package designations equivalent?

A: Yes. SC-79 and SOD-523 refer to the same physical surface mount package configuration used for all three parts in this comparison.