1SS193S,LF(D Equivalent & Substitute Parts

Part Overview

The 1SS193S,LF(D is a general-purpose rectifier diode manufactured by Toshiba Semiconductor and Storage, rated for 80 V DC reverse voltage and 100 mA average rectified current in a surface mount S-Mini package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates as a small-signal diode with fast reverse recovery characteristics suitable for general rectification and switching applications in compact form factors.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	80	V
Current - Average Rectified (Io)	100	mA
Voltage - Forward (Vf) (Max) @ If	1.2 @ 100 mA	V
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	500 nA @ 80 V	nA
Capacitance @ Vr, F	3	pF @ 0V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction (Max)	125	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 1SS193S,LF(D is determined by electrical and mechanical parameter compatibility within the small-signal rectifier diode category. The critical parameters governing substitution are:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 80 V
Current - Average Rectified (Io): Must equal or exceed 100 mA
Voltage - Forward (Vf) (Max) @ If: Must not exceed 1.2 V @ 100 mA
Reverse Recovery Time (trr): Must equal or be faster than 4 ns
Current - Reverse Leakage @ Vr: Must not exceed 500 nA @ 80 V
Capacitance @ Vr, F: Must not exceed 3 pF @ 0V, 1MHz

Mechanical Parameters:

Mounting Type: Surface Mount (required)
Package / Case: TO-236-3, SC-59, SOT-23-3 (compatible packages)
Operating Temperature - Junction: Must support 125°C maximum

Substitute parts are classified into two categories:

Parametric Equivalents: Parts meeting all electrical specifications and operating within identical or superior performance ranges. These include 1SS187,LF, 1SS193,LF, 1SS190TE85LF, and 1SS196(TE85L,F), all manufactured by Toshiba with matching or enhanced electrical characteristics.

Similar Parts: Parts with comparable functionality but with variations in one or more electrical parameters. The BAS116LT1G from onsemi operates at 75 V reverse voltage and 200 mA average rectified current, representing a higher current capability with slightly reduced voltage rating.

Parameter Comparison

Parameter	1SS193S,LF(D (Main)	1SS187,LF	1SS190TE85LF	1SS193,LF	1SS196(TE85L,F)	BAS116LT1G
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	onsemi
Voltage - DC Reverse (Vr) (Max)	80 V	80 V	80 V	80 V	80 V	75 V
Current - Average Rectified (Io)	100 mA	100 mA	100 mA	100 mA	100 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 100 mA	1.2 V @ 100 mA	1.2 V @ 100 mA	1.2 V @ 100 mA	1.2 V @ 100 mA	1.25 V @ 150 mA
Reverse Recovery Time (trr)	4 ns	4 ns	4 ns	4 ns	4 ns	3 µs
Current - Reverse Leakage @ Vr	500 nA @ 80 V	500 nA @ 80 V	500 nA @ 80 V	500 nA @ 80 V	500 nA @ 80 V	5 nA @ 75 V
Capacitance @ Vr, F	3 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz	3 pF @ 0V, 1MHz	3 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	S-Mini	S-Mini	SC-59-3	S-Mini	SC-59-3	SOT-23-3 (TO-236)
Operating Temperature - Junction (Max)	125°C	125°C	125°C	125°C	125°C	150°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Parametric Equivalents (Recommended Primary Substitutes):

The parts 1SS187,LF, 1SS193,LF, 1SS190TE85LF, and 1SS196(TE85L,F) are all active products manufactured by Toshiba with electrical specifications matching or exceeding the 1SS193S,LF(D. All four substitute parts are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with modern manufacturing and storage requirements.

1SS193,LF is the direct active equivalent, maintaining identical electrical parameters and S-Mini package configuration. This part carries the highest inventory availability (63,198 pcs) and is recommended as the primary replacement for direct substitution.

1SS187,LF provides equivalent electrical performance with S-Mini packaging and the highest inventory level (63,100 pcs). The capacitance specification is marginally higher at 4 pF versus 3 pF, which remains within acceptable tolerances for general-purpose rectification applications.

1SS190TE85LF and 1SS196(TE85L,F) maintain identical electrical specifications but utilize SC-59-3 supplier device packaging. These parts are suitable for applications where SC-59-3 package compatibility is required or preferred. Inventory availability is lower (3,800 pcs and 1,097 pcs respectively).

Similar Part (Alternative for Higher Current Applications):

The BAS116LT1G from onsemi operates at 75 V reverse voltage and 200 mA average rectified current, representing a 25 V reduction in voltage rating with doubled current capability. The reverse recovery time is significantly longer at 3 µs compared to 4 ns for Toshiba parts, and reverse leakage current is substantially lower at 5 nA. This part is suitable only for applications where the 75 V voltage rating is acceptable and where the slower switching speed does not impact circuit performance. The BAS116LT1G is RoHS3 compliant with high inventory availability (17,300 pcs).

Product Status Consideration:

The 1SS193S,LF(D is classified as obsolete. All recommended substitute parts are active products with established supply chains and compliance certifications, ensuring long-term availability and regulatory compliance for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can 1SS193,LF be used as a direct replacement for 1SS193S,LF(D?

A: Yes. The 1SS193,LF is an active product with identical electrical specifications (80 V reverse voltage, 100 mA average rectified current, 1.2 V forward voltage, 4 ns reverse recovery time) and compatible S-Mini packaging. The primary difference is product status: 1SS193,LF is active while 1SS193S,LF(D is obsolete.

Q: What is the difference between S-Mini and SC-59-3 packaging?

A: Both are surface mount packages compatible with TO-236-3 and SOT-23-3 footprints. S-Mini and SC-59-3 are supplier device package designations for the same physical form factor. Parts specified with either designation are mechanically and electrically interchangeable on standard SOT-23-3 PCB layouts.

Q: Can BAS116LT1G replace 1SS193S,LF(D in all applications?

A: No. The BAS116LT1G operates at 75 V maximum reverse voltage compared to 80 V for the 1SS193S,LF(D. Applications requiring the full 80 V rating cannot use this part. Additionally, the reverse recovery time is 3 µs versus 4 ns, making it unsuitable for high-speed switching applications. Use BAS116LT1G only when the lower voltage rating and slower switching speed are acceptable for the specific circuit design.

Q: Why do 1SS187,LF and 1SS190TE85LF show different capacitance values?

A: The 1SS187,LF specifies 4 pF capacitance while 1SS190TE85LF specifies 4 pF, and both differ from the main part's 3 pF specification. These minor variations fall within normal manufacturing tolerances for small-signal diodes and do not affect substitution suitability for general-purpose rectification. Capacitance becomes a critical parameter only in high-frequency or precision timing applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts (1SS187,LF, 1SS193,LF, 1SS190TE85LF, 1SS196(TE85L,F), and BAS116LT1G) are RoHS3 compliant. The main part 1SS193S,LF(D does not specify RoHS status due to its obsolete classification.

Q: Which substitute part has the best availability?

A: The 1SS193,LF and 1SS187,LF both have the highest inventory levels at 63,198 pcs and 63,100 pcs respectively. Both are recommended for procurement planning and new design implementations.

Q: Can I use 1SS196(TE85L,F) in place of 1SS193,LF?

A: Yes, electrically. Both parts meet the same electrical specifications (80 V, 100 mA, 1.2 V forward voltage, 4 ns recovery time). The difference is the supplier device package: 1SS196(TE85L,F) uses SC-59-3 designation while 1SS193,LF uses S-Mini. Both are compatible with standard SOT-23-3 PCB footprints. Selection depends on packaging preference and inventory availability.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All substitute parts carry this rating, ensuring compatibility with standard manufacturing and storage practices without additional environmental controls.

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