BS170RLRA N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The BS170RLRA is an N-Channel 60V 500mA MOSFET manufactured by onsemi 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 production continuity. The BS170RLRA serves as a general-purpose small-signal N-Channel MOSFET suitable for switching and amplification applications in low-power circuits.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the BS170RLRA is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

FET Type: N-Channel (required match)
Drain to Source Voltage (Vdss): 60V minimum (equal or higher acceptable)
Continuous Drain Current (Id): 500mA minimum (equal or higher acceptable)
Gate Threshold Voltage (Vgs(th)): 3V maximum (equal or lower acceptable)
Gate Voltage Range (Vgs): ±20V (required match)
Operating Temperature Range: -55°C to 150°C (required match)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole (required match)
Package Type: TO-92-3 or E-Line (TO-92 compatible) (required match)

Substitution Logic: Parts are grouped as direct substitutes when they meet or exceed all electrical parameters while maintaining mechanical compatibility. Parts with higher power dissipation ratings, higher drain current ratings, or lower on-resistance values are acceptable substitutes. Parts with lower drain current ratings or lower power dissipation are not acceptable substitutes for the BS170RLRA.

Parameter Comparison

Parameter	BS170RLRA	BS170-D75Z	BS170P	ZVN2106ASTZ	ZVN4206A	ZVN4206ASTZ
Manufacturer	onsemi	onsemi	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active
Vdss (V)	60	60	60	60	60	60
Id @ 25°C (mA)	500	500	270	450	600	600
Power Dissipation (mW)	350	830	625	700	700	700
Rds On (Max) @ 10V (Ohm)	5	5	5	2	1	1
Vgs(th) (Max) @ 1mA (V)	3	3	3	2.4	3	3
Vgs (Max) (V)	±20	±20	±20	±20	±20	±20
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package Type	TO-92-3	TO-92-3	TO-92-3	E-Line-3	TO-92-3	E-Line-3
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Preferred):

BS170-D75Z (onsemi) is the primary direct substitute. This part maintains identical electrical specifications (60V, 500mA, 5Ohm Rds On) while offering superior power dissipation (830mW vs. 350mW). The BS170-D75Z is active in production and ROHS3 compliant, addressing the obsolescence of the BS170RLRA. Package compatibility is maintained with TO-92-3 configuration.

ZVN4206A (Diodes Incorporated) and ZVN4206ASTZ (Diodes Incorporated) are functionally equivalent substitutes with enhanced performance. Both provide 600mA continuous drain current (exceeding the 500mA requirement) and superior on-resistance (1Ohm vs. 5Ohm). Power dissipation is rated at 700mW. Both are active products with ROHS3 compliance. ZVN4206A is packaged in standard TO-92-3; ZVN4206ASTZ is supplied in E-Line-3 (TO-92 compatible).

Acceptable Substitutes (Conditional):

ZVN2106ASTZ (Diodes Incorporated) is an acceptable substitute with 450mA continuous drain current (below the 500mA specification) and superior on-resistance (2Ohm). This part is suitable only for applications where the 450mA rating meets circuit requirements. The device is active and ROHS3 compliant, supplied in E-Line-3 package.

Not Recommended:

BS170P (Diodes Incorporated) has a continuous drain current rating of 270mA, which is below the BS170RLRA specification of 500mA. This part does not meet the electrical requirements for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can the BS170-D75Z directly replace the BS170RLRA in existing designs?

A: Yes. The BS170-D75Z maintains identical voltage and current ratings (60V, 500mA) and on-resistance (5Ohm @ 200mA, 10V). The higher power dissipation rating (830mW vs. 350mW) provides additional thermal margin. Both use TO-92-3 through-hole packaging with identical pinout. No circuit modifications are required.

Q: What is the difference between ZVN4206A and ZVN4206ASTZ?

A: Both parts are electrically identical with 600mA drain current and 1Ohm on-resistance. The primary difference is packaging: ZVN4206A is supplied in bulk with standard TO-92-3 package, while ZVN4206ASTZ is supplied on tape and reel in E-Line-3 package (TO-92 compatible). Both are suitable for through-hole mounting and pin-compatible with the BS170RLRA.

Q: Why is BS170P not recommended as a substitute?

A: The BS170P has a maximum continuous drain current of 270mA, which is below the BS170RLRA specification of 500mA. Using this part in a circuit designed for 500mA operation would result in device stress and potential failure. This part is not electrically compatible.

Q: Are E-Line packages compatible with standard TO-92-3 footprints?

A: E-Line packages are mechanically and electrically compatible with TO-92 through-hole footprints. The three-lead configuration and pin spacing are identical. Parts such as ZVN2106ASTZ and ZVN4206ASTZ can be used in existing TO-92-3 PCB layouts without modification.

Q: What is the significance of RoHS3 compliance for substitute selection?

A: The BS170RLRA is RoHS non-compliant. All recommended substitutes (BS170-D75Z, ZVN2106ASTZ, ZVN4206A, ZVN4206ASTZ) are ROHS3 compliant. This compliance status is relevant for applications subject to RoHS regulations and for long-term supply chain sustainability.

Q: Can I use ZVN2106ASTZ if my circuit only requires 450mA?

A: Yes. The ZVN2106ASTZ is suitable for applications where the 450mA continuous drain current rating meets circuit requirements. The part provides superior on-resistance (2Ohm) and is active in production with ROHS3 compliance. Verify that your circuit design does not require the full 500mA capability of the original BS170RLRA.

Q: What inventory considerations should guide substitute selection?

A: ZVN4206A has the highest inventory availability (900,100 pcs), followed by BS170P (35,200 pcs), BS170-D75Z (8,300 pcs), and ZVN4206ASTZ (12,400 pcs). For high-volume production, ZVN4206A offers both electrical superiority and supply security. For lower-volume applications, BS170-D75Z provides the most direct specification match.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message