SI3139K-TP P-Channel MOSFET 20V 660mA SOT-723 Equivalent & Substitute Parts

Part Overview

The SI3139K-TP is a P-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) manufactured by Micro Commercial Co, designed for surface mount applications in the SOT-723 package. This device operates at 20V drain-to-source voltage with a continuous drain current rating of 660mA and maximum power dissipation of 150mW. The SI3139K-TP carries a product status designation of "Not For New Designs," indicating that while the component remains available in inventory (8,300 pieces), it is no longer recommended for new circuit development. Identifying equivalent substitute parts is necessary to ensure design continuity, improve component availability, and leverage active product lines with enhanced performance characteristics.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Technology	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	20	V
Current - Continuous Drain (Id) @ 25°C	660	mA
Rds On (Max) @ Id, Vgs	950 @ 500mA, 10V	mOhm
Vgs(th) (Max) @ Id	800 @ 250µA	mV
Vgs (Max)	±6	V
Input Capacitance (Ciss) (Max) @ Vds	170 @ 16V	pF
Power Dissipation (Max)	150	mW
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	SOT-723	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SI3139K-TP are identified based on strict electrical and mechanical parameter equivalence within the P-Channel MOSFET category. The substitution logic is governed by the following critical parameters:

Electrical Equivalence Criteria:

Drain to Source Voltage (Vdss): 20V (exact match required)
FET Type: P-Channel (exact match required)
Technology: MOSFET Metal Oxide (exact match required)
Gate-Source Voltage (Vgs Max): ±6V (exact match required)
Input Capacitance (Ciss) @ 16V: 170 pF (exact match required)
Operating Temperature Range: -55°C to 150°C (exact match required)

Mechanical Equivalence Criteria:

Package / Case: SOT-723 (exact match required)
Mounting Type: Surface Mount (exact match required)

Functional Compatibility Parameters:

Continuous Drain Current (Id) @ 25°C: 660mA (exact match required)

The substitute parts NTK3139PT1G and NTK3139PT5G, both manufactured by onsemi, satisfy all electrical and mechanical equivalence criteria. Both devices are manufactured by onsemi and maintain active product status, providing improved availability and design continuity compared to the legacy SI3139K-TP.

Parameter Comparison

Parameter	SI3139K-TP (Micro Commercial Co)	NTK3139PT1G (onsemi)	NTK3139PT5G (onsemi)	Unit
FET Type	P-Channel	P-Channel	P-Channel	—
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	20	20	20	V
Current - Continuous Drain (Id) @ 25°C	660	660	660	mA
Rds On (Max) @ Id, Vgs	950 @ 500mA, 10V	480 @ 780mA, 4.5V	480 @ 780mA, 4.5V	mOhm
Vgs(th) (Max) @ Id	800 @ 250µA	1.2 @ 250µA	1.2 @ 250µA	mV
Vgs (Max)	±6	±6	±6	V
Input Capacitance (Ciss) (Max) @ Vds	170 @ 16V	170 @ 16V	170 @ 16V	pF
Power Dissipation (Max)	150	310	310	mW
Operating Temperature Range	-55 to 150	-55 to 150	-55 to 150	°C (TJ)
Package / Case	SOT-723	SOT-723	SOT-723	—
Mounting Type	Surface Mount	Surface Mount	Surface Mount	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—
Product Status	Not For New Designs	Active	Active	—

Engineering Selection Recommendations

SI3139K-TP (Micro Commercial Co): This component is designated "Not For New Designs" and should be used only for legacy system maintenance or repair applications where existing inventory is available. The part carries ROHS3 compliance and MSL Level 1 rating, confirming environmental and moisture handling standards.

NTK3139PT1G (onsemi): This substitute part is designated as "Active" product status and is suitable for new design implementations. The NTK3139PT1G provides electrical and mechanical equivalence to the SI3139K-TP while offering enhanced power dissipation capability (310mW versus 150mW) and improved on-resistance characteristics (480mOhm @ 780mA, 4.5V versus 950mOhm @ 500mA, 10V). The device maintains ROHS3 compliance and MSL Level 1 rating. Inventory availability is 85,400 pieces. Packaging is provided in Cut Tape (CT) and Digi-Reel® format.

NTK3139PT5G (onsemi): This substitute part is designated as "Active" product status and is suitable for new design implementations. The NTK3139PT5G provides identical electrical and mechanical equivalence to the NTK3139PT1G, with the same enhanced power dissipation (310mW) and on-resistance characteristics. The device maintains ROHS3 compliance and MSL Level 1 rating. Inventory availability is 21,100 pieces. Packaging is provided in Cut Tape (CT) and Digi-Reel® format.

Both onsemi substitute parts satisfy all mandatory electrical and mechanical parameters for direct substitution. Selection between NTK3139PT1G and NTK3139PT5G is determined by packaging and inventory requirements, as both devices are electrically and mechanically identical.

Frequently Asked Questions (FAQ)

Q: Can the NTK3139PT1G or NTK3139PT5G be used as direct replacements for the SI3139K-TP in existing designs?

A: Yes. Both onsemi parts satisfy all critical electrical parameters (Vdss, Id, Vgs, Ciss) and mechanical specifications (SOT-723 package, surface mount). The devices are pin-compatible and functionally equivalent. The enhanced power dissipation rating (310mW versus 150mW) and improved on-resistance characteristics of the onsemi parts provide additional design margin.

Q: What is the difference between NTK3139PT1G and NTK3139PT5G?

A: Both parts are electrically and mechanically identical. The difference lies in packaging format and supplier logistics. NTK3139PT1G and NTK3139PT5G are both supplied in Cut Tape (CT) and Digi-Reel® format by onsemi. Selection is based on inventory availability and procurement requirements.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. Both NTK3139PT1G and NTK3139PT5G are ROHS3 compliant and REACH unaffected, matching the compliance status of the SI3139K-TP.

Q: What is the Moisture Sensitivity Level (MSL) for the substitute parts?

A: Both substitute parts carry MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. This matches the SI3139K-TP specification.

Q: Why does the SI3139K-TP have a "Not For New Designs" status?

A: The "Not For New Designs" designation indicates that Micro Commercial Co has discontinued active development and promotion of this part number. Existing inventory remains available for legacy applications, but new designs should utilize the active onsemi alternatives (NTK3139PT1G or NTK3139PT5G) to ensure long-term supply chain continuity and access to technical support.

Q: Are there any thermal or performance differences between the SI3139K-TP and the substitute parts?

A: The substitute parts offer improved thermal performance with a maximum power dissipation rating of 310mW compared to the SI3139K-TP rating of 150mW. Both devices operate across the same temperature range (-55°C to 150°C). The onsemi parts also demonstrate lower on-resistance (480mOhm @ 780mA, 4.5V) compared to the SI3139K-TP (950mOhm @ 500mA, 10V), resulting in reduced power loss and improved efficiency in switching applications.

Q: What packaging options are available for the substitute parts?

A: Both NTK3139PT1G and NTK3139PT5G are supplied in Cut Tape (CT) and Digi-Reel® packaging formats by onsemi. The SI3139K-TP is supplied in Tape & Reel (TR) format by Micro Commercial Co. All three parts use the SOT-723 surface mount package, ensuring mechanical compatibility on printed circuit boards.

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