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

STMicroelectronics STS5PF20V

Name: STS5PF20V
Brand: STMicroelectronics
SKU: STS5PF20V
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STS5PF20V

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: STS5PF20V.pdf

Description:: MOSFET P-CH 20V 5A 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:9,578

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Product details

Overview

STS5PF20V from STMicroelectronics is a P-channel enhancement-mode power MOSFET in SO-8 package, rated for 20 V V_DSS, 5 A continuous drain current at T_C = 25°C, and ultra-low 0.065 Ω R_DS(on) at V_GS = 4.5 V. It features 2.5 V logic-level gate drive compatibility and is optimized for high-efficiency DC-DC conversion and battery-side power switching in portable electronics.

For engineers reviewing the STS5PF20V datasheet, STS5PF20V pinout, STS5PF20V application, or STS5PF20V equivalent, key selection criteria include its 2.5 V threshold voltage, 0.085 Ω R_DS(on) at 2.5 V drive, SO-8 thermal performance (R_thj-amb = 50 °C/W), integrated body diode with 1.2 V forward drop at 5 A, and suitability for synchronous buck high-side or load-switch configurations.

Technical Context

This P-channel MOSFET uses ST's StripFET™ II process to achieve low on-resistance with minimal gate charge (Q_g = 4.5 nC at V_GS = 2.5 V) and fast switching (t_d(on) = 11 ns, t_f = 20 ns). Its ultra-low V_GS(th) (0.45 V typ.) enables direct interface with 2.5 V microcontrollers without level-shifting.

The device supports bidirectional current flow via its intrinsic source-drain diode (I_SD = 5 A, V_SD = 1.2 V), and operates across –55 to 150 °C junction temperature range with safe operating area limited by 2.5 W total dissipation at T_C = 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	20 V - Maximum drain-source blocking voltage; defines upper limit for battery-input or rail-switching applications
R_DS(on) @ 4.5 V	0.065 Ω - Enables <165 mW conduction loss at 2.5 A, critical for thermally constrained mobile PCBs
R_DS(on) @ 2.5 V	0.085 Ω - Supports direct drive from 2.5 V I/O rails without gate boosters in space-constrained designs
V_GS(th)	0.45 V (typ.) - Ensures reliable turn-on with margin below 2.5 V supply, reducing risk of partial enhancement
Q_g	4.5 nC - Low gate charge minimizes driver power and enables efficient 1–2 MHz switching in DC-DC controllers
I_D (cont.) @ 100°C	3.1 A - Derated current rating reflects real-world thermal limits in enclosed handheld enclosures
V_SD	1.2 V @ 5 A - Body diode forward voltage impacts reverse-current path losses in buck converters and OR-ing circuits

Pinout & Package

STS5PF20V is housed in standard SO-8 surface-mount package (JEDEC MS-012AC), with exposed drain pad for enhanced thermal conduction. Pin 1 is Gate, Pins 2–4 and 5–7 are Source (common), Pin 8 is Drain.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Gate	Control terminal; accepts 2.5 V logic-level signals; requires no external level shifter
Pins 2, 3, 4, 5, 6, 7	Source	Common source node; internally bonded together for low-inductance, high-current return path
Pin 8	Drain	Main power output terminal; connected to exposed copper pad for thermal sinking to PCB ground plane

Key Features

Feature	Design Value
Ultra-low threshold voltage	V_GS(th) = 0.45 V typ. ensures full enhancement with 2.5 V microcontroller outputs
Low R_DS(on) at 2.5 V drive	0.085 Ω enables <215 mW conduction loss at 2.5 A, reducing thermal footprint vs. 3.3 V gate devices
Optimized gate charge	Q_g = 4.5 nC allows fast switching with minimal driver IC loading and gate resistor heat
Integrated body diode	V_SD = 1.2 V @ 5 A supports freewheeling and reverse-current protection without external diodes
SO-8 thermal design	Exposed drain pad and 50 °C/W R_thj-amb enable >1.5 W dissipation on 2-layer PCB with 1-in² copper pour

Applications

Cellular Phone Power Management

USB-C Load Switch

Use Scenario: Battery disconnect during sleep mode and system reset in GSM/UMTS handsets.

IC Role / Device Role: High-side P-channel load switch controlling main PMIC input rail.

Use Value: 2.5 V gate compatibility eliminates level shifter; 0.085 Ω R_DS(on) limits dropout to <213 mV at 2.5 A, preserving battery runtime.

Use Scenario: USB-C port power delivery enable/disable with overcurrent protection coordination.

IC Role / Device Role: Reverse-polarity protected load switch placed between USB-C receptacle and system power rail.

Use Value: Integrated body diode blocks reverse current from VBUS to battery; 20 V rating withstands USB PD transient surges up to ±20 V.

DC-DC Synchronous Buck High-Side

Portable Medical Device Battery Protection

Use Scenario: High-side switch in 3.3 V → 1.2 V buck converter for SoC core supply in tablets.

IC Role / Device Role: Upper FET in discrete synchronous rectification stage driven by controller PWM.

Use Value: Low Q_g (4.5 nC) and fast t_f (20 ns) reduce switching losses at 1.5 MHz; R_DS(on) < 0.085 Ω maintains >92% efficiency at 2 A load.

Use Scenario: Over-discharge cutoff and charge path isolation in lithium-ion powered glucose meters.

IC Role / Device Role: Bidirectional protection switch isolating battery from load and charger based on fuel gauge command.

Use Value: –55 to 150 °C operating range supports clinical environments; 5 A pulsed rating handles defibrillator surge events without latch-up.

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel logic-level power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si7851DP-T1-GE3 (Vishay)	V_DSS = 20 V, R_DS(on) = 0.055 Ω @ 4.5 V, but V_GS(th) = 0.7 V min - less margin at 2.5 V drive	Higher gate threshold increases risk of incomplete turn-on with weak 2.5 V drivers	Prefer when higher R_DS(on) margin is acceptable and board layout allows tighter thermal management
DMG2305UVT-7 (Diodes Inc.)	V_DSS = 20 V, R_DS(on) = 0.052 Ω @ 4.5 V, Q_g = 5.2 nC - slightly higher gate charge than STS5PF20V	SO-8 package but non-standard pinout (Drain on Pin 1); requires PCB redesign	Select only if lower R_DS(on) justifies layout revision and driver can support 5.2 nC charge

Compared with Si7851DP and DMG2305UVT, STS5PF20V offers superior 2.5 V drive assurance (0.45 V V_GS(th)) and standard SO-8 pinout, making it optimal for legacy-compatible, low-voltage portable designs where gate drive margin and layout reuse are critical.

Availability

STS5PF20V is available at Aetrix Electronics and suitable for cellular phone power management, USB-C load switching, and portable medical device battery protection requiring stable component supply and long-term industrial availability.

Supply support for STS5PF20V 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The STS5PF20V belongs to ST's StripFET™ II logic-level MOSFET product line, engineered specifically for high-efficiency, low-voltage power switching in battery-powered portable equipment.

FAQ

Is STS5PF20V suitable for synchronous rectification in a 1.8 V output buck converter?

Yes - its 0.085 Ω R_DS(on) at 2.5 V gate drive and 20 V V_DSS rating allow use as high-side switch in buck topologies delivering ≤1.8 V output from 3.3–5 V input. The low Q_g (4.5 nC) supports efficient operation up to 2 MHz, and its SO-8 thermal profile accommodates typical 2-layer PCB layouts with 1-in² copper pour.

Does STS5PF20V have avalanche ruggedness rated in the datasheet?

No - the official STMicroelectronics datasheet for STS5PF20V does not specify single-pulse or repetitive avalanche energy ratings (E_AS). Designers must ensure operating conditions remain within the Safe Operating Area (SOA) curve and avoid unclamped inductive switching to prevent device failure.

Can STS5PF20V replace an N-channel MOSFET in a high-side switch configuration?

Yes - as a P-channel device, STS5PF20V is inherently suited for high-side switching without bootstrap circuitry. Unlike N-channel alternatives, it simplifies gate drive design by enabling direct connection to logic-level control signals while sourcing current from the supply rail to the load.

What is the maximum recommended PCB copper area for thermal relief with STS5PF20V in SO-8?

ST recommends connecting Pin 8 (Drain) and the exposed pad beneath the SO-8 package to ≥1 in² (6.45 cm²) of 2-oz copper on the top layer, thermally vias to inner ground planes, and minimum 10 thermal vias (0.3 mm diameter) to maximize heat transfer. This achieves ~40 °C/W effective R_thj-amb, supporting 2.0 W continuous dissipation.

STS5PF20V Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™ II

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 20 V

Current - Continuous Drain (Id) @ 25°C:: 5A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 2.5V, 4.5V

Rds On (Max) @ Id, Vgs:: 80mOhm @ 2.5A, 4.5V

Vgs(th) (Max) @ Id:: 450mV @ 250µA (Min)

Gate Charge (Qg) (Max) @ Vgs:: 6 nC @ 2.5 V

Vgs (Max):: ±8V

Input Capacitance (Ciss) (Max) @ Vds:: 412 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 2.5W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

STS5PF20V FAQ

1.How can I place an order for STS5PF20V through Aetrix?

Please submit a Request for Quotation (RFQ) for STS5PF20V 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 STS5PF20V reliable?

The price and inventory of STS5PF20V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STS5PF20V is usually 5 days.

3.What payment methods are accepted for STS5PF20V?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STS5PF20V transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STS5PF20V?

STS5PF20V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STS5PF20V 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 STS5PF20V?

For technical support, including STS5PF20V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STS5PF20V requirements.

6.How does Aetrix verify that STS5PF20V is sourced from the original manufacturer or authorized distributors?

All STS5PF20V 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 STS5PF20V meets industry standards.

7.What is the process for return or replacement of STS5PF20V?

All STS5PF20V units undergo pre-shipment inspection (PSI). If there is an issue with STS5PF20V, 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 STS5PF20V part is unused and in its original packaging.

Return procedure for STS5PF20V:

1.Submit a request within 90 days.

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

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