1SS388-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The 1SS388-TP is an active Schottky diode manufactured by Micro Commercial Co, rated for 40V DC reverse voltage with 100mA average rectified current in a surface mount SOD-523 package. This component is designed for small-signal rectification applications requiring low forward voltage drop and fast switching characteristics. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when application requirements necessitate alternative electrical or mechanical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	100	mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 50 mA	mV
Current - Reverse Leakage @ Vr	5	µA @ 10 V
Capacitance @ Vr, F	25	pF @ 0V, 1MHz
Technology	Schottky	—
Package / Case	SC-79, SOD-523	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 1SS388-TP are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent (Direct Substitution): Parts that maintain identical or equivalent electrical specifications and package form factor, enabling direct replacement without circuit modification.

Functional Substitute (Higher Rating): Parts that exceed the electrical specifications of the primary part while maintaining the same package and technology, suitable for applications where increased current capacity or improved performance characteristics are acceptable.

Substitution eligibility is determined by the following key parameters:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40V
Package / Case: Must be SC-79, SOD-523 or compatible surface mount form factor
Technology: Must be Schottky diode technology
Mounting Type: Must be Surface Mount
RoHS and MSL Compliance: Must maintain ROHS3 Compliant and MSL 1 status

Parameter Comparison

Parameter	1SS388-TP (Main)	CES388,L3F (Parametric Equivalent)	BAT54KFILM (Functional Substitute)
Manufacturer	Micro Commercial Co	Toshiba Semiconductor and Storage	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V
Current - Average Rectified (Io)	100 mA	100 mA	300 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 50 mA	600 mV @ 100 mA	900 mV @ 100 mA
Current - Reverse Leakage @ Vr	5 µA @ 10 V	5 µA @ 40 V	1 µA @ 30 V
Capacitance @ Vr, F	25 pF @ 0V, 1MHz	25 pF @ 0V, 1MHz	10 pF @ 1V, 1MHz
Technology	Schottky	Schottky	Schottky
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	Not specified	Not specified	5 ns
Package / Case	SC-79, SOD-523	SC-79, SOD-523	SC-79, SOD-523
Supplier Device Package	SOD-523	ESC	SOD-523
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	125°C (Max)	125°C (Max)	-40°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

CES388,L3F (Parametric Equivalent): This Toshiba Schottky diode maintains electrical specifications identical to the 1SS388-TP, including 40V reverse voltage rating, 100mA average rectified current, and 600mV forward voltage drop. Both parts are ROHS3 compliant with MSL 1 rating and active product status. The CES388,L3F is suitable for direct replacement in applications where the original 1SS388-TP specifications are required. The difference in supplier device package (ESC versus SOD-523) does not affect functional compatibility in the SC-79 form factor.

BAT54KFILM (Functional Substitute): This STMicroelectronics Schottky diode exceeds the current rating of the 1SS388-TP (300mA versus 100mA) while maintaining the 40V reverse voltage specification. The BAT54KFILM is classified as fast recovery with 5ns reverse recovery time, compared to the small-signal classification of the primary part. This part is suitable for applications requiring higher current capacity or improved switching performance. The BAT54KFILM is ROHS3 compliant with MSL 1 rating and active product status. The extended operating temperature range (-40°C to 150°C) provides additional thermal margin compared to the 1SS388-TP maximum of 125°C.

All substitute parts maintain surface mount SOD-523 package compatibility and Schottky technology classification, ensuring mechanical and electrical interchangeability within the specified parameter constraints.

Frequently Asked Questions (FAQ)

Q: Can the CES388,L3F be used as a direct replacement for the 1SS388-TP?

A: Yes. The CES388,L3F maintains identical electrical specifications including 40V reverse voltage, 100mA average rectified current, and 600mV forward voltage drop. Both parts are Schottky diodes in SOD-523 surface mount packages with ROHS3 compliance and MSL 1 rating. Direct substitution is supported without circuit modification.

Q: What is the primary difference between the 1SS388-TP and the BAT54KFILM?

A: The BAT54KFILM is rated for 300mA average rectified current compared to the 1SS388-TP rating of 100mA. The BAT54KFILM is classified as fast recovery with 5ns reverse recovery time, whereas the 1SS388-TP is classified as small signal. Both maintain 40V reverse voltage rating and SOD-523 package compatibility. The BAT54KFILM is suitable for applications requiring higher current capacity.

Q: Are all substitute parts available in the same package?

A: All substitute parts are available in the SC-79, SOD-523 surface mount package form factor. The CES388,L3F uses an ESC supplier device package designation, while the 1SS388-TP and BAT54KFILM use SOD-523 designation. These designations refer to the same physical package and are mechanically compatible.

Q: Do the substitute parts meet the same compliance requirements as the 1SS388-TP?

A: Yes. Both the CES388,L3F and BAT54KFILM are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the compliance profile of the 1SS388-TP. All parts are active products with REACH Unaffected status and EAR99 ECCN classification.

Q: Can the BAT54KFILM be used in applications designed for the 1SS388-TP?

A: The BAT54KFILM can be used in applications designed for the 1SS388-TP provided the circuit design accommodates the higher current rating and fast recovery characteristics. The 40V reverse voltage specification and SOD-523 package ensure mechanical compatibility. Circuit validation is necessary to confirm that the increased current capacity and faster switching speed do not introduce unintended effects in the specific application.

Q: What is the difference in forward voltage between the substitute parts?

A: The 1SS388-TP and CES388,L3F both specify 600mV maximum forward voltage drop. The BAT54KFILM specifies 900mV maximum forward voltage drop at 100mA. Applications sensitive to forward voltage drop characteristics should account for this 300mV difference when evaluating the BAT54KFILM as a substitute.

Q: Are there inventory considerations when selecting a substitute part?

A: Inventory availability varies by part. The 1SS388-TP has 956 pieces in stock, the CES388,L3F has 5200 pieces in stock, and the BAT54KFILM has 19359 pieces in stock. Procurement decisions may consider inventory levels in addition to electrical and mechanical compatibility requirements.

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