1SS294,LF Schottky Diode Equivalent & Substitute Parts

Part Overview

The 1SS294,LF is a Schottky diode manufactured by Toshiba Semiconductor and Storage, designed for surface mount applications in the S-Mini package configuration. This component operates at a maximum reverse voltage of 40 V with an average rectified current rating of 100 mA. The device is classified as a small signal Schottky diode and is currently in active production status. Alternative components become necessary when inventory constraints exist, when specific packaging requirements differ, or when application parameters permit higher current ratings within the same voltage class.

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 @ 100 mA	mV
Current - Reverse Leakage @ Vr	5	µA @ 40 V
Capacitance @ Vr, F	25	pF @ 0V, 1MHz
Technology	Schottky	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
Operating Temperature - Junction (Max)	125	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the 1SS294,LF with the BAT54FILM is permissible based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

Voltage - DC Reverse (Vr) (Max): Both rated at 40 V
Package / Case: Both available in TO-236-3, SC-59, SOT-23-3 configurations
Technology: Both are Schottky diodes
RoHS Status: Both ROHS3 Compliant
Moisture Sensitivity Level: Both rated MSL 1 (Unlimited)

Substitution Basis: The BAT54FILM exceeds the current rating of the 1SS294,LF (300 mA versus 100 mA), permitting its use in applications where the 1SS294,LF is specified, provided the circuit design does not depend on the lower current limitation. Both devices share identical reverse voltage specifications and compatible package geometries, ensuring mechanical and electrical interchangeability within the specified voltage class.

Parameter Comparison

Parameter	1SS294,LF (Toshiba)	BAT54FILM (STMicroelectronics)	Unit
Voltage - DC Reverse (Vr) (Max)	40	40	V
Current - Average Rectified (Io)	100	300	mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 100 mA	900 mV @ 100 mA	mV
Current - Reverse Leakage @ Vr	5 µA @ 40 V	1 µA @ 30 V	µA
Capacitance @ Vr, F	25 pF @ 0V, 1MHz	10 pF @ 1V, 1MHz	pF
Technology	Schottky	Schottky	-
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	-
Operating Temperature - Junction	125 (Max)	-40 ~ 150	°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	-

Engineering Selection Recommendations

Both the 1SS294,LF and BAT54FILM are active production components with ROHS3 compliance and MSL 1 ratings, confirming their suitability for modern manufacturing and long-term storage without moisture sensitivity constraints.

The BAT54FILM is electrically interchangeable with the 1SS294,LF for applications operating within the 1SS294,LF current specification of 100 mA. The BAT54FILM's higher current rating of 300 mA does not restrict its use in lower-current applications. Both devices maintain the same 40 V reverse voltage rating and compatible SOT-23-3 package geometry.

Selection between these components should be based on availability, packaging format preference (Tape & Reel versus Cut Tape & Digi-Reel), and manufacturer supply chain considerations. The forward voltage characteristic difference (600 mV versus 900 mV at 100 mA) should be evaluated in precision rectification circuits where voltage drop directly affects system performance.

Frequently Asked Questions (FAQ)

Q: Can the BAT54FILM directly replace the 1SS294,LF in all applications?

A: The BAT54FILM is electrically and mechanically compatible with the 1SS294,LF for applications operating at or below 100 mA. Both devices share identical 40 V reverse voltage ratings and compatible SOT-23-3 package configurations. Substitution is valid provided the circuit design does not depend on the specific forward voltage characteristics of the 1SS294,LF.

Q: What is the primary difference between these two Schottky diodes?

A: The BAT54FILM has a higher average rectified current rating of 300 mA compared to the 1SS294,LF at 100 mA. The BAT54FILM also exhibits a higher forward voltage drop (900 mV versus 600 mV at 100 mA) and lower reverse leakage current (1 µA versus 5 µA). Both devices operate at the same 40 V maximum reverse voltage.

Q: Are the package dimensions identical between these parts?

A: Both the 1SS294,LF and BAT54FILM are available in TO-236-3, SC-59, and SOT-23-3 package configurations. Physical dimensions and pin layouts are compatible, permitting direct board-level substitution without PCB redesign.

Q: What are the compliance and reliability ratings for both components?

A: Both components are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. These certifications confirm suitability for lead-free manufacturing processes and unrestricted storage conditions without desiccant requirements.

Q: How do the operating temperature ranges compare?

A: The 1SS294,LF specifies a maximum junction temperature of 125°C. The BAT54FILM operates across a wider temperature range of -40°C to 150°C, providing greater thermal margin in applications subject to temperature extremes.

Q: Which component should be selected for new designs?

A: Component selection for new designs should be based on current requirements, forward voltage drop tolerance, and supply chain availability. The BAT54FILM's higher current rating and wider operating temperature range provide additional design margin for applications where these parameters are beneficial.

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