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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Diodes Incorporated BS170PSTOA

Name: BS170PSTOA
Brand: Diodes Incorporated
SKU: BS170PSTOA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BS170PSTOA

Manufacturer:: Diodes Incorporated

Category:: FETs, MOSFETs

Package:: E-Line-3

Datasheet:: BS170PSTOA.pdf

Description:: MOSFET N-CH 60V 270MA E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:8,575

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Product details

Overview

BS170PSTOA from Diodes Incorporated is an N-channel enhancement-mode vertical DMOS FET rated for 60 V drain-source voltage, 270 mA continuous drain current, and 5 Ω R_DS(on) at V_GS = 10 V; used as a low-voltage switching device in power management circuits of portable instrumentation and LED driver stages.

For engineers reviewing the BS170PSTOA datasheet, BS170PSTOA pinout, BS170PSTOA application, or BS170PSTOA equivalent, key selection criteria include verified R_DS(on), gate threshold voltage range (0.8–3 V), switching speed (10 ns turn-on/turn-off), thermal limits (−55 to +150 °C), and TO-92 package compatibility with legacy board layouts.

Technical Context

This discrete MOSFET operates in enhancement mode with a vertically structured DMOS cell, enabling fast switching and stable conduction under pulsed conditions (pulse width = 300 µs, duty cycle ≤ 2%). Its gate threshold voltage range (0.8–3 V) supports direct TTL/CMOS logic-level drive without level-shifting circuitry.

Electrical behavior is characterized at 25 °C ambient: zero-gate-voltage drain leakage is limited to 0.5 µA at V_DS = 25 V, and input capacitance is 60 pF at V_GS = 0 V, V_DS = 10 V, f = 1 MHz - critical for high-frequency gate drive design.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	60 V - maximum blocking voltage before avalanche breakdown at I_D = 100 µA
I_D (continuous)	270 mA - max DC load current at T_amb = 25 °C without derating
R_DS(on)	5 Ω - on-resistance at V_GS = 10 V, I_D = 200 mA, defining conduction loss in switch applications
V_GS(th)	0.8–3 V - gate voltage range where channel begins conducting at I_D = 1 mA
t_on/t_off	10 ns each - measured with 50 Ω source impedance and <5 ns rise time, indicating suitability for >10 MHz switching
P_tot	625 mW - total power dissipation limit at T_amb = 25 °C, constraining thermal design margin
C_iss	60 pF - input capacitance at V_GS = 0 V, V_DS = 10 V, f = 1 MHz, affecting gate drive energy requirement

Pinout & Package

BS170PSTOA is housed in an E-Line TO-92 compatible through-hole package with standard lead configuration: Drain (D), Gate (G), Source (S) mapped to pins 1, 2, 3 respectively per JEDEC TO-92 outline.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (D)	Drain	Main current-carrying terminal connected to high-side load or supply rail
Pin 2 (G)	Gate	Control terminal requiring ≤±20 V bias; low input capacitance enables fast switching
Pin 3 (S)	Source	Reference node for gate drive and current return path; tied to ground or low-side reference

Key Features

Feature	Design Value
N-channel enhancement mode	Requires positive V_GS to conduct - simplifies gate drive architecture vs depletion-mode devices
Vertical DMOS structure	Enables higher current density and lower R_DS(on) than planar MOSFETs in same package
TTL/CMOS-compatible V_GS(th)	Turns on fully with standard 5 V logic outputs - eliminates need for gate driver ICs
Fast switching (10 ns)	Reduces transition losses in PWM-based loads such as LED dimming and relay drivers

Applications

LED Driver Switching

Low-Voltage Relay Control

Use Scenario: Driving 12 V LED strings in automotive interior lighting with PWM dimming at 1–5 kHz.

IC Role / Device Role / Timing Role: Low-side switching element controlled by microcontroller GPIO.

Use Value: 5 Ω R_DS(on) limits conduction loss to <15 mW at 200 mA, minimizing thermal stress on PCB.

Use Scenario: Activating 5 V coil relays in industrial I/O modules with isolated control signals.

IC Role / Device Role / Timing Role: Solid-state replacement for mechanical relay contacts in signal path switching.

Use Value: 10 ns switching ensures clean contact bounce-free transitions and supports >10 kcps operation.

Portable Instrument Power Gating

USB Peripheral Load Switch

Use Scenario: Enabling/disabling sensor sub-circuits in handheld multimeters to extend battery life.

IC Role / Device Role / Timing Role: High-side or low-side power switch controlled by system supervisor IC.

Use Value: −55 to +150 °C operating range ensures reliability across extended environmental testing.

Use Scenario: Managing inrush current and hot-plug sequencing for USB-powered peripherals.

IC Role / Device Role / Timing Role: Load switch between upstream USB port and downstream device power rail.

Use Value: 0.5 µA I_DSS at V_DS = 25 V minimizes standby leakage in always-on USB host ports.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-power N-channel switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZVN3306A	R_DS(on) = 3.5 Ω (lower), V_GS(th) = 1–2.5 V (tighter), C_iss = 50 pF (lower)	Better suited for higher-efficiency 3.3 V logic-driven switches where gate drive margin is constrained	Prefer ZVN3306A when optimizing for lower conduction loss and tighter threshold tolerance
2N7002	R_DS(on) = 5.5 Ω (higher), V_GS(th) = 1–2.5 V, SOT-23 package (surface-mount)	Designed for automated assembly; lacks TO-92 mechanical compatibility but offers smaller footprint	Select 2N7002 for space-constrained PCBs requiring reflow-compatible packaging

Compared with ZVN3306A and 2N7002, BS170PSTOA provides proven TO-92 mechanical fit and broader V_GS(th) range for robustness across temperature and process variation, at the cost of slightly higher R_DS(on) and larger board area.

Availability

BS170PSTOA is available at Aetrix Electronics and suitable for LED driver switching, low-voltage relay control, and portable instrument power gating requiring stable component supply and long-term obsolescence management.

Supply support for BS170PSTOA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

BS170PSTOA belongs to Diodes' general-purpose power MOSFET product line, engineered for cost-sensitive, low-power switching applications in consumer, industrial, and computing end-equipment where reliability and legacy package compatibility are prioritized.

FAQ

What is the maximum gate-source voltage rating for BS170PSTOA?

The absolute maximum gate-source voltage (V_GS) is ±20 V. Exceeding this rating risks permanent gate oxide damage. Designers must ensure gate drive circuits - including transient spikes - remain within this limit, especially during hot-swap or inductive load switching events.

Can BS170PSTOA be driven directly by a 3.3 V microcontroller GPIO?

Yes - its gate threshold voltage range (0.8–3 V) allows reliable turn-on with 3.3 V logic, though R_DS(on) will be higher than at 10 V. At V_GS = 3.3 V, typical R_DS(on) is ~12 Ω (per characterization curves in ZVN3306A reference data), so conduction loss must be verified for the target load current.

Is BS170PSTOA RoHS compliant and halogen-free?

Yes - BS170PSTOA meets RoHS Directive 2011/65/EU and is halogen-free per Diodes Incorporated's material declarations. The TO-92 package uses lead-free matte tin plating, and all internal die materials comply with JEDEC J-STD-609A Class 1 requirements.

Does BS170PSTOA require a gate resistor for stability?

A small gate series resistor (10–100 Ω) is recommended to dampen ringing caused by gate-drain capacitance (C_rss) interacting with PCB trace inductance. While not mandatory for basic DC switching, it improves EMI performance and prevents false triggering during fast edge transitions in noisy environments.

BS170PSTOA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: E-Line-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 60 V

Current - Continuous Drain (Id) @ 25°C:: 270mA (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 5Ohm @ 200mA, 10V

Vgs(th) (Max) @ Id:: 3V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: -

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 60 pF @ 10 V

FET Feature:: -

Power Dissipation (Max):: 625mW (Ta)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: E-Line (TO-92 compatible)

BS170PSTOA FAQ

1.How can I place an order for BS170PSTOA through Aetrix?

Please submit a Request for Quotation (RFQ) for BS170PSTOA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BS170PSTOA reliable?

The price and inventory of BS170PSTOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BS170PSTOA is usually 5 days.

3.What payment methods are accepted for BS170PSTOA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BS170PSTOA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BS170PSTOA?

BS170PSTOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BS170PSTOA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BS170PSTOA?

For technical support, including BS170PSTOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BS170PSTOA requirements.

6.How does Aetrix verify that BS170PSTOA is sourced from the original manufacturer or authorized distributors?

All BS170PSTOA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BS170PSTOA meets industry standards.

7.What is the process for return or replacement of BS170PSTOA?

All BS170PSTOA units undergo pre-shipment inspection (PSI). If there is an issue with BS170PSTOA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BS170PSTOA part is unused and in its original packaging.

Return procedure for BS170PSTOA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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