BSS123L N-Channel MOSFET 100V 170mA Equivalent & Substitute Parts

Part Overview

The BSS123L is an N-Channel MOSFET manufactured by onsemi, rated for 100V drain-to-source voltage with 170mA continuous drain current at 25°C. The device is housed in a SOT-23-3 surface mount package and dissipates 360mW maximum power. This part is currently in active production status with 665 pieces available in inventory.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or when functionally compatible alternatives from different manufacturers meet the same electrical and mechanical specifications. The parts listed below maintain compatibility with the BSS123L across critical parameters including voltage rating, current capacity, package type, and operating temperature range.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	100	V
Continuous Drain Current (Id) @ 25°C	170	mA
Rds On (Max) @ 10V, 170mA	6	Ω
Gate Threshold Voltage (Vgs(th)) @ 1mA	2	V
Power Dissipation (Max)	360	mW
Operating Temperature Range	−55 to 150	°C
Package Type	SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BSS123L are qualified based on the following criteria:

Electrical Compatibility Requirements:

FET Type: N-Channel (mandatory)
Drain to Source Voltage (Vdss): 100V (mandatory)
Continuous Drain Current (Id) @ 25°C: 170mA (mandatory)
Gate Threshold Voltage (Vgs(th)): 2V to 2.8V @ 1mA (acceptable range)
Rds On (Max) @ 10V: 6Ω (mandatory)
Operating Temperature Range: −55°C to 150°C (mandatory)

Mechanical Compatibility Requirements:

Package Type: SOT-23-3 or TO-236-3 (mandatory)
Mounting Type: Surface Mount (mandatory)

Compliance Requirements:

RoHS3 Compliant (mandatory)
Moisture Sensitivity Level: 1 (Unlimited) (mandatory)

Substitute parts are grouped into two categories: direct equivalents (identical electrical and mechanical specifications) and compatible alternatives (meeting all mandatory parameters with minor variations in non-critical specifications such as power dissipation or input capacitance).

Parameter Comparison

Parameter	BSS123L (onsemi)	BVSS123LT1G (onsemi)	BSS123TA (Diodes Inc.)	BSS123-7-F (Diodes Inc.)	BSS123_R1_00001 (Panjit)
Manufacturer	onsemi	onsemi	Diodes Incorporated	Diodes Incorporated	Panjit International Inc.
FET Type	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel
Vdss (V)	100	100	100	100	100
Id @ 25°C (mA)	170	170	170	170	170
Rds On (Max) @ 10V (Ω)	6	6	6	6	6
Vgs(th) @ 1mA (V)	2	2.8	2	2	2.5
Power Dissipation (Max) (mW)	360	225	360	300	500
Ciss @ 25V (pF)	21.5	20	20	60	45
Operating Temperature (°C)	−55 to 150	−55 to 150	−55 to 150	−55 to 150	−55 to 150
Package	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

BVSS123LT1G (onsemi) — This part is a direct onsemi equivalent with identical core electrical specifications to the BSS123L. The BVSS123LT1G carries AEC-Q101 automotive qualification, indicating enhanced reliability screening and traceability. Power dissipation is reduced to 225mW, which may be advantageous in thermally constrained applications. This part is suitable for applications requiring automotive-grade components or where enhanced qualification documentation is required. Inventory availability is significantly higher at 15,100 pieces.

BSS123TA (Diodes Incorporated) — This part maintains identical electrical specifications to the BSS123L, including 360mW power dissipation and 6Ω Rds On. The BSS123TA is manufactured by Diodes Incorporated and is suitable for direct substitution in applications where multi-source qualification is acceptable. Inventory availability is 2,719 pieces.

BSS123-7-F (Diodes Incorporated) — This part meets all mandatory electrical parameters with 6Ω Rds On and 170mA continuous drain current. Power dissipation is 300mW, representing a reduction from the BSS123L. Input capacitance is elevated at 60pF compared to 21.5pF in the BSS123L, which may affect switching speed in high-frequency applications. This part has the highest inventory availability at 107,300 pieces, making it suitable for high-volume production requirements.

BSS123_R1_00001 (Panjit International Inc.) — This part meets all mandatory electrical parameters with 6Ω Rds On and 170mA continuous drain current. Power dissipation is elevated at 500mW, providing additional thermal margin. Input capacitance is 45pF. This part is packaged in Tape & Reel format and is suitable for high-volume automated assembly. Inventory availability is 17,099 pieces.

All substitute parts maintain RoHS3 compliance, unlimited moisture sensitivity level (MSL 1), and the required operating temperature range of −55°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can the BVSS123LT1G replace the BSS123L in all applications?

A: The BVSS123LT1G is electrically compatible with the BSS123L across all mandatory parameters. The primary difference is reduced power dissipation (225mW versus 360mW) and automotive-grade qualification. In applications where thermal margin is critical, the lower power dissipation of the BVSS123LT1G may provide improved performance. Both parts are manufactured by onsemi and share the same SOT-23-3 package.

Q: What is the significance of the power dissipation differences among substitute parts?

A: Power dissipation ratings indicate the maximum thermal energy the device can safely dissipate. The BSS123L and BSS123TA are rated at 360mW, the BSS123-7-F at 300mW, the BVSS123LT1G at 225mW, and the BSS123_R1_00001 at 500mW. In applications with limited thermal management, parts with lower power dissipation ratings may require more conservative design margins. Conversely, parts with higher ratings provide additional thermal headroom.

Q: Are there package compatibility concerns when substituting these parts?

A: All substitute parts use SOT-23-3 or equivalent TO-236-3 surface mount packages with identical pin configurations and footprints. The BSS123_R1_00001 is specified as SOT-23, which is functionally equivalent to SOT-23-3. No PCB layout modifications are required when substituting any of these parts.

Q: What does AEC-Q101 qualification mean for the BVSS123LT1G?

A: AEC-Q101 is an automotive industry standard qualification that specifies reliability and quality requirements for semiconductor components. Parts carrying this qualification have undergone enhanced testing and screening procedures. The BVSS123LT1G's AEC-Q101 status makes it suitable for automotive applications or systems requiring automotive-grade component traceability.

Q: How do input capacitance differences affect circuit performance?

A: Input capacitance (Ciss) affects the gate charge required to switch the MOSFET and influences switching speed. The BSS123L has 21.5pF input capacitance, while the BSS123-7-F has 60pF. In high-frequency switching applications, the higher capacitance of the BSS123-7-F may result in slower switching transitions and increased gate drive power requirements. For low-frequency applications, this difference is negligible.

Q: Can these parts be used interchangeably in existing designs?

A: All substitute parts maintain the same drain-to-source voltage (100V), continuous drain current (170mA), on-resistance (6Ω @ 10V), and operating temperature range (−55°C to 150°C). They are housed in compatible SOT-23-3 surface mount packages. Designs qualified with the BSS123L can accept any of these substitute parts without circuit modification, provided thermal and switching speed requirements are verified for the specific application.

Q: What inventory considerations should guide part selection?

A: The BSS123-7-F offers the highest inventory availability at 107,300 pieces, followed by the BSS123_R1_00001 at 17,099 pieces and the BVSS123LT1G at 15,100 pieces. The original BSS123L has 665 pieces available. For high-volume production or long-term supply security, parts with higher inventory levels provide greater availability assurance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message