STS5N15F3 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The STS5N15F3 is an N-Channel 150V, 5A MOSFET manufactured by STMicroelectronics in the STripFET™ III series, housed in an 8-SOIC surface mount package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility across drain-source voltage, continuous drain current, on-resistance characteristics, and thermal specifications while accommodating the 8-SOIC package standard.

Key Parameters

Parameter	STS5N15F3 Specification
Drain to Source Voltage (Vdss)	150 V
Continuous Drain Current (Id) @ 25°C	5A (Tc)
On-Resistance (Rds On Max) @ Id, Vgs	57 mOhm @ 2.5A, 10V
Gate Threshold Voltage (Vgs(th) Max) @ Id	4V @ 250µA
Gate Charge (Qg Max) @ Vgs	29 nC @ 10V
Input Capacitance (Ciss Max) @ Vds	1300 pF @ 25V
Power Dissipation (Max)	2.5W (Tc)
Operating Temperature Range	-55°C to 150°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the STS5N15F3 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Drain to Source Voltage (Vdss): 150V minimum
Package / Case: 8-SOIC form factor with 0.154" (3.90mm) width
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C (TJ)
FET Type: N-Channel
Technology: MOSFET (Metal Oxide)
Gate Threshold Voltage (Vgs(th)): 4V @ 250µA
Maximum Gate Voltage (Vgs Max): ±20V

Performance Parameters for Functional Equivalence:

Continuous Drain Current (Id): 4.1A to 5A range
On-Resistance (Rds On): 47 to 67 mOhm @ 10V
Gate Charge (Qg): 13 to 48 nC @ 10V
Input Capacitance (Ciss): 760 to 2710 pF
Power Dissipation: 2.5W minimum

All identified substitute parts meet the mandatory compatibility criteria and operate within acceptable performance parameter ranges for direct substitution in applications designed for the STS5N15F3.

Parameter Comparison

Parameter	STS5N15F3	STS5N15F4	FDS2572	FDS2582	FDS86242	FDS86252
Manufacturer	STMicroelectronics	STMicroelectronics	onsemi	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active
Vdss (V)	150	150	150	150	150	150
Id @ 25°C (A)	5 (Tc)	5 (Tc)	4.9 (Tc)	4.1 (Ta)	4.1 (Ta)	4.5 (Ta)
Rds On Max @ 10V (mOhm)	57 @ 2.5A	63 @ 2.5A	47 @ 4.9A	66 @ 4.1A	67 @ 4.1A	55 @ 4.5A
Vgs(th) Max @ 250µA (V)	4	4	4	4	4	4
Qg Max @ 10V (nC)	29	48	38	25	13	15
Ciss Max @ 25V or 75V (pF)	1300 @ 25V	2710 @ 25V	2050 @ 25V	1290 @ 25V	760 @ 75V	955 @ 75V
Power Dissipation Max (W)	2.5 (Tc)	2.5 (Tc)	2.5 (Ta)	2.5 (Ta)	2.5 (Ta), 5 (Tc)	2.5 (Ta), 5 (Tc)
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: STS5N15F4

The STS5N15F4 is the direct successor to the STS5N15F3 within the STMicroelectronics product line. Both devices share identical voltage and current ratings (150V, 5A), matching package specifications (8-SOIC), and thermal operating range (-55°C to 150°C). The STS5N15F4 carries Active product status with full ROHS3 compliance and MSL 1 rating, ensuring long-term availability and supply chain continuity. On-resistance variance (63 mOhm vs. 57 mOhm) and increased gate charge (48 nC vs. 29 nC) remain within acceptable design margins for most applications. This part is recommended as the primary replacement for direct substitution.

Secondary Substitutes: onsemi FDS Series

The onsemi FDS2572, FDS2582, FDS86242, and FDS86252 represent alternative N-Channel 150V MOSFETs in 8-SOIC packaging with Active product status. These devices maintain full electrical compatibility across voltage, temperature, and package specifications. Continuous drain current ratings range from 4.1A to 4.9A, accommodating applications with current requirements at or below the original 5A specification. On-resistance characteristics (47 to 67 mOhm) and gate charge values (13 to 38 nC) fall within functional equivalence ranges. All onsemi substitutes carry ROHS3 compliance and MSL 1 ratings.

Selection Criteria by Application:

Lowest On-Resistance: FDS2572 (47 mOhm @ 4.9A, 10V) for efficiency-critical applications
Lowest Gate Charge: FDS86242 (13 nC @ 10V) for high-frequency switching circuits
Lowest Input Capacitance: FDS86242 (760 pF @ 75V) for fast switching response
Highest Current Margin: STS5N15F4 (5A) for applications requiring full original current specification
Enhanced Thermal Performance: FDS86242 and FDS86252 (5W @ Tc) for high-power dissipation scenarios

All substitute parts are certified ROHS3 compliant and carry unlimited moisture sensitivity levels, meeting regulatory and environmental requirements equivalent to the original device.

Frequently Asked Questions (FAQ)

Q: Can the STS5N15F4 be used as a direct drop-in replacement for the STS5N15F3?

A: Yes. The STS5N15F4 maintains identical voltage (150V), current (5A), package (8-SOIC), and temperature specifications (-55°C to 150°C). Both devices are N-Channel MOSFETs with 4V gate threshold voltage and ±20V maximum gate voltage. The STS5N15F4 is the recommended primary substitute.

Q: What is the difference between the onsemi FDS2572 and FDS2582?

A: Both are onsemi N-Channel 150V MOSFETs in 8-SOIC packaging. The FDS2572 provides 4.9A continuous drain current with 47 mOhm on-resistance, while the FDS2582 provides 4.1A with 66 mOhm on-resistance. The FDS2572 is preferred for applications requiring higher current capacity or lower on-resistance losses.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts (STS5N15F4, FDS2572, FDS2582, FDS86242, FDS86252) carry ROHS3 compliance certification, meeting environmental and regulatory requirements equivalent to the original STS5N15F3.

Q: What is the significance of the different power dissipation ratings (2.5W vs. 5W)?

A: Power dissipation ratings reflect thermal performance under specified conditions. The STS5N15F3 and most onsemi substitutes are rated 2.5W (Ta or Tc). The FDS86242 and FDS86252 offer dual ratings: 2.5W (Ta) and 5W (Tc), indicating enhanced thermal performance under case temperature measurement. This provides additional thermal margin in high-power applications.

Q: Can I substitute an onsemi part for an STMicroelectronics part in existing designs?

A: Yes, provided the application does not depend on manufacturer-specific characteristics beyond the electrical and thermal parameters listed. All substitute parts maintain the same 8-SOIC package footprint, voltage/current specifications, and operating temperature range. Verify gate charge and input capacitance compatibility with driver circuits, as these parameters vary among substitutes.

Q: What does MSL 1 (Unlimited) mean?

A: Moisture Sensitivity Level 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All identified parts carry MSL 1 rating, eliminating moisture-related reliability concerns.

Q: Why do some parts list different measurement conditions (Ta vs. Tc) for current and power dissipation?

A: Ta (ambient temperature) and Tc (case temperature) represent different thermal measurement reference points. Both are valid for component selection; verify your application's thermal management approach aligns with the specified measurement condition.

Q: Is the STS5N15F3 still available for purchase?

A: The STS5N15F3 is classified as obsolete. While limited inventory may exist through authorized distributors, long-term availability is not guaranteed. Transition to an active substitute part (STS5N15F4 or onsemi alternatives) is recommended for new designs and ongoing production.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Both are surface mount delivery formats. Cut Tape (CT) provides components in individual strips suitable for small-quantity applications. Tape & Reel (TR) delivers components on continuous reels for high-volume automated assembly. Electrical specifications remain identical; packaging choice depends on production volume and assembly equipment.

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