BS170-D74Z N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The BS170-D74Z is an N-Channel MOSFET manufactured by onsemi, rated for 60V drain-to-source voltage with 500mA continuous drain current and 830mW power dissipation. The device is housed in a TO-92-3 through-hole package and is designed for general-purpose switching and amplification applications.

The BS170-D74Z carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	500	mA
Power Dissipation (Max)	830	mW
Rds On (Max) @ 200mA, 10V	5	Ω
Vgs(th) (Max) @ 1mA	3	V
Vgs (Max)	±20	V
Input Capacitance (Ciss) @ 10V	40	pF
Operating Temperature Range	−55 to 150	°C
Mounting Type	Through Hole	—
Package	TO-92-3 (TO-226AA)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BS170-D74Z is determined by electrical and mechanical parameter equivalence across the following criteria:

Primary Substitution Criteria:

FET Type: N-Channel topology
Technology: MOSFET (Metal Oxide) construction
Drain to Source Voltage (Vdss): 60V minimum rating
Continuous Drain Current (Id): 500mA minimum at 25°C
Power Dissipation: 830mW minimum rating
On-State Resistance (Rds On): 5Ω maximum at specified conditions
Gate Threshold Voltage (Vgs(th)): 3V maximum at 1mA
Gate Voltage Range (Vgs): ±20V maximum
Input Capacitance (Ciss): 40pF maximum at 10V
Operating Temperature Range: −55°C to 150°C minimum
Mounting Type: Through Hole configuration
Package: TO-92-3 (TO-226AA) physical form factor
Compliance: ROHS3 Compliant

The BS170 (base product number, Bulk packaging) meets all electrical and mechanical requirements for direct substitution. Both parts share identical electrical specifications and package geometry, with the primary distinction being packaging format (Cut Tape versus Bulk) and product status (Obsolete versus Active).

Parameter Comparison

Parameter	BS170-D74Z (Main Part)	BS170 (Substitute)	Match Status
Manufacturer	onsemi	onsemi	Identical
FET Type	N-Channel	N-Channel	Identical
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	Identical
Vdss	60 V	60 V	Identical
Id @ 25°C	500 mA	500 mA	Identical
Power Dissipation (Max)	830 mW	830 mW	Identical
Rds On (Max) @ 200mA, 10V	5 Ω	5 Ω	Identical
Vgs(th) (Max) @ 1mA	3 V	3 V	Identical
Vgs (Max)	±20 V	±20 V	Identical
Ciss (Max) @ 10V	40 pF	40 pF	Identical
Operating Temperature	−55 to 150 °C	−55 to 150 °C	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Obsolete	Active	Different
Packaging Format	Cut Tape (CT)	Bulk	Different

Engineering Selection Recommendations

BS170 (Bulk Packaging) as Primary Substitute:

The BS170 is the direct electrical and mechanical equivalent of the BS170-D74Z. All electrical parameters, thermal ratings, and physical package dimensions are identical. The BS170 carries Active product status, ensuring ongoing manufacturer support and supply chain availability. Both parts maintain ROHS3 compliance and equivalent regulatory certifications (REACH Unaffected, EAR99 classification).

The distinction between BS170-D74Z and BS170 is packaging format only: Cut Tape versus Bulk. This difference does not affect electrical performance or functional compatibility. Selection between these two should be based on procurement requirements and quantity needs rather than technical performance.

For applications requiring the BS170-D74Z specifically due to its Obsolete status, the BS170 in Bulk packaging provides complete functional replacement with the advantage of Active product status and improved supply availability.

Frequently Asked Questions (FAQ)

Q: Can the BS170 (Bulk) directly replace the BS170-D74Z (Cut Tape)?

A: Yes. Both parts are electrically and mechanically identical. The only difference is packaging format: Cut Tape versus Bulk. Electrical performance, thermal characteristics, and physical package dimensions are equivalent. Selection depends on procurement and assembly requirements.

Q: Why is the BS170-D74Z marked as Obsolete?

A: The BS170-D74Z carries Obsolete product status. The base product BS170 remains Active. For new designs or ongoing production, the Active BS170 is the recommended selection to ensure supply chain continuity.

Q: Are there any compliance differences between BS170-D74Z and BS170?

A: No. Both parts are ROHS3 Compliant, REACH Unaffected, and classified as EAR99. Regulatory and environmental compliance is identical.

Q: What are the critical electrical parameters for substitution?

A: Substitution is valid when the following parameters match or exceed the original specification: Vdss (60V), Id (500mA), Rds On (5Ω @ 200mA, 10V), Vgs(th) (3V @ 1mA), power dissipation (830mW), and operating temperature range (−55°C to 150°C). All parameters must be met simultaneously.

Q: Is the TO-92-3 package pinout identical between BS170-D74Z and BS170?

A: Yes. Both parts use the TO-92-3 (TO-226AA) package with identical lead configuration and pinout. Direct socket substitution is supported without circuit modification.

Q: What inventory status should I consider for procurement?

A: BS170-D74Z has 22,347 pieces in stock (Cut Tape). BS170 has 35,100 pieces in stock (Bulk). For long-term supply security, the BS170 (Active status, higher inventory) is the preferred selection.

Q: Can I use BS170 in a circuit designed for BS170-D74Z without circuit changes?

A: Yes. Electrical specifications, thermal performance, and package geometry are identical. No circuit modifications are required. Direct substitution is supported.

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