BS170RLRAG N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The BS170RLRAG is an N-Channel MOSFET manufactured by onsemi, rated for 60V drain-to-source voltage with 500mA continuous drain current in a TO-92-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 150°C and dissipates up to 350mW at ambient temperature.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain-to-Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	500	mA
Gate-Source Voltage (Vgs) Max	±20	V
Gate Threshold Voltage (Vgs(th)) @ 1mA	3	V
On-State Resistance (Rds On) @ 200mA, 10V	5	Ohm
Power Dissipation (Max)	350	mW
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package	TO-92-3 (TO-226)	—

Substitute Part Grouping Explanation

Substitution of the BS170RLRAG is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain-to-Source Voltage (Vdss): Must equal or exceed 60V
Continuous Drain Current (Id): Must equal or exceed 500mA at 25°C
Gate-Source Voltage (Vgs): Must support ±20V maximum
Gate Threshold Voltage (Vgs(th)): Must be 3V or lower at 1mA
On-State Resistance (Rds On): Must not exceed 5 Ohm at specified conditions
Operating Temperature Range: Must span -55°C to 150°C

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package Type: TO-92-3 or TO-92 compatible form factors

Substitute parts are grouped into two categories:

Direct Substitutes (Identical Electrical Performance): Parts meeting all electrical parameters with identical or superior power dissipation ratings and matching package specifications.

Functional Equivalents (Compatible Electrical Performance): Parts meeting core electrical parameters with variations in secondary characteristics such as input capacitance or power dissipation, suitable for applications where the BS170RLRAG specifications are not fully saturated.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (mA)	Rds On @ 10V (Ohm)	Vgs(th) @ 1mA (V)	Power Dissipation (mW)	Package	Product Status
BS170RLRAG	onsemi	60	500	5	3	350	TO-92-3	Obsolete
BS170-D27Z	onsemi	60	500	5	3	830	TO-92-3	Active
BS170	onsemi	60	500	5	3	830	TO-92-3	Active
BS170-D26Z	Fairchild Semiconductor	60	500	5	3	830	TO-92-3	Active
BS170-D74Z	onsemi	60	500	5	3	830	TO-92-3	Obsolete
BS170-D75Z	onsemi	60	500	5	3	830	TO-92-3	Active
BS170P	Diodes Incorporated	60	270	5	3	625	TO-92-3	Active
ZVN2106ASTZ	Diodes Incorporated	60	450	2	2.4	700	E-Line (TO-92 compatible)	Active
ZVN4206A	Diodes Incorporated	60	600	1	3	700	TO-92-3	Active
ZVN4206ASTZ	Diodes Incorporated	60	600	1	3	700	E-Line (TO-92 compatible)	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

BS170-D27Z, BS170, BS170-D75Z, and BS170-D26Z are direct electrical equivalents to the BS170RLRAG. These parts maintain identical Vdss (60V), Id (500mA), Rds On (5 Ohm), and Vgs(th) (3V) specifications. All are packaged in TO-92-3 form factor. BS170-D27Z, BS170, and BS170-D75Z are manufactured by onsemi and carry Active product status, ensuring long-term availability. BS170-D26Z, manufactured by Fairchild Semiconductor, is also Active and provides equivalent electrical performance. These substitutes feature enhanced power dissipation ratings (830mW) compared to the original 350mW specification, providing additional thermal margin in applications.

Secondary Substitutes (Conditional Compatibility):

ZVN4206A and ZVN4206ASTZ exceed the BS170RLRAG specifications with 600mA continuous drain current and superior on-state resistance (1 Ohm at 10V). These parts are suitable for applications where higher current capacity and lower conduction losses are beneficial. Both carry Active product status and RoHS3 compliance.

ZVN2106ASTZ provides 450mA continuous drain current with lower on-state resistance (2 Ohm at 10V) and operates within the same voltage and temperature specifications. This part is packaged in E-Line (TO-92 compatible) form factor and carries Active product status.

Limited Substitutes (Current Derating Required):

BS170P, manufactured by Diodes Incorporated, is rated for 270mA continuous drain current, which is below the BS170RLRAG 500mA specification. This part is suitable only for applications where the actual drain current requirement does not exceed 270mA. The part carries Active product status and RoHS3 compliance.

Compliance and Availability:

All recommended substitutes carry RoHS3 compliance and REACH Unaffected status, meeting modern environmental and regulatory requirements. onsemi-manufactured variants (BS170-D27Z, BS170, BS170-D75Z) offer the highest inventory availability and continuity with the original design lineage.

Frequently Asked Questions (FAQ)

Q: Can BS170-D27Z directly replace BS170RLRAG in all applications?

A: Yes. BS170-D27Z maintains identical electrical specifications (60V Vdss, 500mA Id, 5 Ohm Rds On, 3V Vgs(th)) and TO-92-3 package compatibility. The increased power dissipation rating (830mW vs. 350mW) provides additional thermal headroom without affecting circuit operation.

Q: What is the difference between BS170, BS170-D27Z, and BS170-D75Z?

A: All three parts are electrically identical with 60V Vdss, 500mA Id, and 5 Ohm Rds On specifications. The designations reflect different packaging formats and distribution channels: BS170 is supplied in Bulk packaging, BS170-D27Z in Cut Tape, and BS170-D75Z in Cut Tape. Selection depends on procurement and assembly requirements rather than electrical performance.

Q: Is ZVN4206A a suitable replacement for BS170RLRAG?

A: ZVN4206A is electrically compatible with enhanced specifications: 600mA continuous drain current (vs. 500mA) and 1 Ohm on-state resistance (vs. 5 Ohm). The part is suitable for direct replacement in applications where the circuit can tolerate lower conduction losses and higher current capacity. Package compatibility is maintained in TO-92-3 form factor.

Q: Why does BS170P have lower current rating than BS170RLRAG?

A: BS170P is rated for 270mA continuous drain current, which is below the BS170RLRAG 500mA specification. This part is not suitable for applications requiring 500mA operation. Use only in circuits where actual drain current does not exceed 270mA.

Q: Are E-Line packaged parts (ZVN2106ASTZ, ZVN4206ASTZ) mechanically compatible with TO-92-3 sockets?

A: E-Line packages are described as TO-92 compatible, indicating mechanical and pin compatibility with standard TO-92-3 through-hole footprints. Verify mechanical fit with specific PCB layouts and socket designs before production implementation.

Q: What is the significance of the Rds On difference between BS170RLRAG and ZVN4206A?

A: BS170RLRAG specifies 5 Ohm Rds On at 200mA and 10V gate voltage. ZVN4206A specifies 1 Ohm Rds On at 1.5A and 10V gate voltage. The lower on-state resistance in ZVN4206A results in reduced conduction losses and lower junction temperature during operation. This is advantageous in power-sensitive applications but does not affect switching or logic-level operation.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry RoHS3 Compliant status. The original BS170RLRAG does not specify RoHS status. All substitutes meet modern environmental compliance requirements.

Q: Which substitute offers the best long-term availability?

A: BS170 (onsemi, Bulk packaging) and BS170-D75Z (onsemi, Cut Tape) offer the highest inventory levels (35,100 and 8,300 units respectively) and Active product status, ensuring sustained availability for ongoing production and design support.

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