BS170FTC N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The BS170FTC is an N-Channel MOSFET manufactured by Diodes Incorporated, rated for 60 V drain-to-source voltage with a maximum continuous drain current of 150 µA at 25°C. The device is housed in a SOT-23-3 surface mount package and dissipates a maximum of 330 mW. The BS170FTC is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across drain-to-source voltage, gate threshold voltage, on-resistance characteristics, and thermal performance while conforming to identical or superior packaging and compliance standards.

Key Parameters

Parameter	BS170FTC Value	Unit
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—
Drain-to-Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	150	µA
On-Resistance (Rds On) @ 200 mA, 10 V	5	Ω
Gate Threshold Voltage (Vgs(th)) @ 1 mA	3	V
Maximum Gate Voltage (Vgs)	±20	V
Input Capacitance (Ciss) @ 10 V	60	pF
Power Dissipation (Max)	330	mW
Operating Temperature Range	−55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BS170FTC is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must equal or exceed 60 V
Gate Threshold Voltage (Vgs(th)) must be compatible with circuit drive requirements
On-Resistance (Rds On) characteristics must support application current and switching performance
Maximum Gate Voltage (Vgs) must accommodate ±20 V or greater
Input Capacitance (Ciss) must not introduce unacceptable switching delays

Mechanical & Packaging Compatibility:

Package must be SOT-23-3 (TO-236-3, SC-59) surface mount
Mounting type must be surface mount
Pin configuration must be identical

Compliance & Regulatory:

RoHS3 compliance required
MSL rating of 1 (Unlimited) required
Operating temperature range must support −55°C to 150°C minimum

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching or exceeding all electrical parameters with identical packaging) and Higher-Performance Alternatives (enhanced current handling or thermal performance while maintaining package compatibility).

Parameter Comparison

Parameter	BS170FTC	2N7002 (UMW)	2N7002K-TP (MCC)	BSS138AKAR (Nexperia)	MMBF170 (onsemi)	MMBF170LT1G (onsemi)	NX7002AKAR (Nexperia)	PMBF170,235 (Nexperia)
Vdss (V)	60	60	60	60	60	60	60	60
Id @ 25°C (mA)	0.15	115	340	200	500	500	190	300
Rds On @ 10 V (Ω)	5	5	5	4.5	5	5	4.5	5
Vgs(th) (V)	3	2.5	2.5	1.5	3	3	2.1	2
Vgs (Max) (V)	±20	20	±20	±20	±20	±20	—	±20
Ciss @ 10 V (pF)	60	50	40	47	40	60	17	40
Power Dissipation (mW)	330	225	350	300	300	225	265	830 (Tc)
Operating Temp (°C)	−55 to 150	—	−55 to 150	−55 to 150	−55 to 150	−55 to 150	−55 to 150	−65 to 150
Package	SOT-23-3	SOT-23	SOT-23	TO-236AB	SOT-23-3	SOT-23-3	TO-236AB	TO-236AB
Product Status	Obsolete	Active	Active	Active	Active	Active	Obsolete	Not For New Designs
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
MSL Rating	1	1	1	1	1	1	1	1

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Product Status):

MMBF170 (onsemi) and MMBF170LT1G (onsemi) are the preferred direct substitutes for the BS170FTC. Both devices maintain identical electrical characteristics including 60 V Vdss, 5 Ω Rds On at 10 V, and 3 V Vgs(th) at 1 mA. Both are packaged in SOT-23-3 and rated for −55°C to 150°C operation. MMBF170LT1G offers reduced power dissipation (225 mW versus 300 mW) and is recommended for thermally constrained applications. Both parts carry active product status and full RoHS3 compliance.

2N7002K-TP (Micro Commercial Co) is an active alternative offering enhanced current handling (340 mA) while maintaining 60 V Vdss and 5 Ω Rds On characteristics. This part is suitable for applications requiring higher drain current capacity within the same thermal envelope. Operating temperature range is −55°C to 150°C with full RoHS3 compliance.

BSS138AKAR (Nexperia USA Inc.) provides automotive-grade qualification (AEC-Q100) with 60 V Vdss and 200 mA continuous drain current. This part features lower Vgs(th) (1.5 V) and reduced Rds On (4.5 Ω), making it suitable for low-voltage gate drive applications. Operating temperature extends to −55°C to 150°C with RoHS3 compliance.

2N7002 (UMW) is an active substitute with 60 V Vdss and 115 mA continuous drain current. This part is suitable for moderate current applications and offers broad availability.

Secondary Alternatives (Obsolete or Not For New Designs):

NX7002AKAR (Nexperia USA Inc.) is classified as obsolete and should not be selected for new designs, despite offering 60 V Vdss and 190 mA continuous drain current.

PMBF170,235 (Nexperia USA Inc.) carries a "Not For New Designs" status and is designated for legacy system support only. This part offers 300 mA continuous drain current and extended operating temperature (−65°C to 150°C) but should not be used in new product development.

Selection Criteria Summary:

For direct replacement in existing designs: MMBF170 or MMBF170LT1G
For enhanced current capacity: 2N7002K-TP
For automotive applications: BSS138AKAR
For legacy system support only: PMBF170,235 or NX7002AKAR

Frequently Asked Questions (FAQ)

Q: Can MMBF170 directly replace BS170FTC without circuit modification?

A: Yes. MMBF170 maintains identical electrical specifications including 60 V Vdss, 5 Ω Rds On at 10 V, 3 V Vgs(th), and ±20 V maximum gate voltage. Both devices are packaged in SOT-23-3 with identical pin configuration. No circuit modification is required.

Q: What is the difference between MMBF170 and MMBF170LT1G?

A: Both parts are electrically identical with 60 V Vdss, 500 mA continuous drain current, and 3 V Vgs(th). The primary difference is power dissipation: MMBF170 dissipates 300 mW while MMBF170LT1G dissipates 225 mW. MMBF170LT1G is recommended for thermally constrained applications.

Q: Why is NX7002AKAR listed as a substitute if it is obsolete?

A: NX7002AKAR is included in the substitute list because it was explicitly referenced in the BS170FTC manufacturer documentation. However, its obsolete status disqualifies it from new design selection. Active alternatives such as MMBF170 or 2N7002K-TP should be used instead.

Q: Can 2N7002K-TP be used in applications requiring only 150 µA continuous drain current?

A: Yes. 2N7002K-TP is rated for 340 mA continuous drain current, which exceeds the 150 µA requirement of the BS170FTC. The device will operate within specification at lower current levels. The higher current rating provides design margin and does not degrade performance in lower-current applications.

Q: What is the significance of the "Not For New Designs" status on PMBF170,235?

A: Parts designated "Not For New Designs" are maintained in production for legacy system support only. These parts should not be selected for new product development. Active alternatives such as MMBF170 or 2N7002K-TP must be used for new designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference carry RoHS3 compliance certification. All parts also maintain MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: Does BSS138AKAR require different gate drive voltage than BS170FTC?

A: BSS138AKAR features a lower gate threshold voltage (1.5 V) compared to BS170FTC (3 V). This allows BSS138AKAR to be driven by lower gate voltage sources. However, both devices accept the same maximum gate voltage (±20 V), and BSS138AKAR will operate correctly with standard 10 V gate drive signals used for BS170FTC.

Q: What is the operating temperature range for all substitute parts?

A: All recommended active substitutes (MMBF170, MMBF170LT1G, 2N7002K-TP, BSS138AKAR, and 2N7002) support the full −55°C to 150°C operating temperature range required by BS170FTC. PMBF170,235 extends to −65°C minimum, providing additional low-temperature margin.

Q: Can substitute parts be mixed within a single production run?

A: Yes, provided all parts meet the electrical and thermal requirements of the application. However, design documentation must specify all approved part numbers, and procurement must ensure consistent sourcing to maintain supply chain traceability and compliance documentation.

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