1SS184S,LF(D Equivalent & Substitute Parts

Part Overview

The 1SS184S,LF(D is a general-purpose diode array manufactured by Toshiba Semiconductor and Storage, configured as a 1 Pair Common Cathode design rated for 80 V DC reverse voltage and 100 mA average rectified current per diode. The device is housed in a Surface Mount TO-236-3 (SC-59, SOT-23-3) package suitable for small-signal applications with reverse recovery time of 4 ns.

This part is classified as Obsolete. Identification of equivalent and substitute components is necessary to support ongoing design requirements, manufacturing continuity, and system maintenance where the original part is no longer available from primary sources.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Voltage - DC Reverse (Vr) (Max)	80	V
Current - Average Rectified (Io) (per Diode)	100	mA
Voltage - Forward (Vf) (Max) @ If	1.2 @ 100 mA	V
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	500 nA @ 80 V	nA
Operating Temperature - Junction (Max)	125	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Technology	Standard	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 1SS184S,LF(D is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Diode Configuration: 1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max): 80 V
Current - Average Rectified (Io) (per Diode): 100 mA
Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 100 mA
Speed Classification: Small Signal ≤ 200mA (Io), Any Speed
Reverse Recovery Time (trr): 4 ns
Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, SOT-23-3

All identified substitute parts meet these mandatory criteria. Variations in reverse leakage current, maximum junction temperature, and packaging format (Cut Tape, Tape & Reel, or Digi-Reel) do not affect functional substitution within the specified electrical operating range.

Parameter Comparison

Parameter	1SS184S,LF(D	1SS184,LF	1SS184-TP	DAN202KFHT146	DAN202KT146
Manufacturer	Toshiba	Toshiba	Micro Commercial Co	Rohm Semiconductor	Rohm Semiconductor
Product Status	Obsolete	Active	Active	Active	Active
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max)	80 V	80 V	80 V	80 V	80 V
Current - Average Rectified (Io) (per Diode)	100 mA	100 mA	100 mA	100 mA	100 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
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed
Reverse Recovery Time (trr)	4 ns	4 ns	4 ns	4 ns	4 ns
Current - Reverse Leakage @ Vr	500 nA @ 80 V	500 nA @ 80 V	500 nA @ 80 V	100 nA @ 70 V	100 nA @ 70 V
Operating Temperature - Junction (Max)	125°C	125°C	125°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Not specified	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Primary Substitutes (Toshiba Manufacturer Family):

The 1SS184,LF is the direct active equivalent to the obsolete 1SS184S,LF(D. Both are manufactured by Toshiba Semiconductor and Storage with identical electrical specifications. The 1SS184,LF is available in Cut Tape and Digi-Reel packaging formats and carries ROHS3 compliance certification. This part is recommended as the first choice for direct replacement where Toshiba sourcing is preferred and inventory availability is adequate (22,199 pcs in stock).

The 1SS184-TP, manufactured by Micro Commercial Co, provides equivalent electrical performance with Tape & Reel packaging. This part is ROHS3 compliant and carries REACH Unaffected status. Selection of this part is appropriate where Tape & Reel format is required for automated assembly processes.

Secondary Substitutes (Rohm Semiconductor Family):

The DAN202KFHT146 and DAN202KT146, both manufactured by Rohm Semiconductor, meet all mandatory electrical equivalence criteria. These parts feature improved reverse leakage characteristics (100 nA @ 70 V versus 500 nA @ 80 V) and higher maximum junction temperature rating (150°C versus 125°C). The DAN202KFHT146 carries AEC-Q101 automotive qualification and is available in Tape & Reel format. The DAN202KT146 is available in Cut Tape and Digi-Reel format with significantly higher inventory availability (205,245 pcs in stock).

Both Rohm parts are ROHS3 compliant and REACH Unaffected. Selection of Rohm substitutes is appropriate where enhanced thermal performance or automotive-grade qualification is required, or where inventory availability and cost considerations favor the DAN202 series.

Frequently Asked Questions (FAQ)

Q: Can the 1SS184,LF directly replace the obsolete 1SS184S,LF(D?

A: Yes. The 1SS184,LF is electrically and mechanically equivalent to the 1SS184S,LF(D. Both parts share identical diode configuration, voltage ratings, current ratings, forward voltage characteristics, and reverse recovery time. The primary difference is product status: 1SS184,LF is Active with higher inventory availability.

Q: What is the difference between the Toshiba 1SS184,LF and the Micro Commercial Co 1SS184-TP?

A: Both parts are electrically equivalent with identical electrical specifications. The primary difference is packaging format: 1SS184,LF is supplied in Cut Tape and Digi-Reel format, while 1SS184-TP is supplied in Tape & Reel format. Selection depends on assembly process requirements.

Q: How do the Rohm DAN202 series parts differ from the Toshiba 1SS184 series?

A: The DAN202KFHT146 and DAN202KT146 meet all mandatory electrical equivalence criteria. Differences include: (1) Reverse leakage current is lower (100 nA @ 70 V versus 500 nA @ 80 V), (2) Maximum junction temperature is higher (150°C versus 125°C), and (3) DAN202KFHT146 carries AEC-Q101 automotive qualification. These differences represent performance enhancements suitable for applications requiring improved thermal margin or automotive-grade reliability.

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

A: Yes. All substitute parts are housed in TO-236-3 (SC-59, SOT-23-3) surface mount packages with identical pin configurations and footprints. Differences exist only in packaging format (Cut Tape, Tape & Reel, or Digi-Reel) for supply and handling purposes, not in the component package itself.

Q: Which substitute part should be selected for new designs?

A: For new designs, the 1SS184,LF (Toshiba, Active status) or DAN202KT146 (Rohm, Active status with higher inventory) are appropriate selections. Both are ROHS3 compliant and widely available. The DAN202KT146 offers superior inventory availability (205,245 pcs) and enhanced thermal performance. Selection between these two should be based on preferred manufacturer, packaging format requirements, and cost considerations.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts (1SS184,LF, 1SS184-TP, DAN202KFHT146, and DAN202KT146) are ROHS3 compliant. The original obsolete part 1SS184S,LF(D does not specify RoHS status.

Q: Can these parts be used in automotive applications?

A: The DAN202KFHT146 carries AEC-Q101 automotive qualification and is suitable for automotive applications. The other parts do not carry automotive qualification designations. Application suitability should be confirmed against specific automotive requirements and qualification standards.

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