Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

STMicroelectronics 2STF2220

Name: 2STF2220
Brand: STMicroelectronics
SKU: 2STF2220
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 2STF2220

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: 2STF2220.pdf

Description:: TRANS PNP 20V 1.5A SOT-89-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,924

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

2STF2220 from STMicroelectronics is a PNP bipolar power transistor fabricated using PB-HDC (Power Bipolar High Density Current) technology, designed for high-gain, low-saturation-voltage switching in portable power management. It delivers h_FE ≥ 120 at I_C = −1.5 A, V_CE(sat) = −0.45 V at I_C = −1.5 A / I_B = −150 mA, and continuous collector current of −1.5 A in SOT-89 package - used in battery charger switching regulators.

For engineers reviewing the 2STF2220 datasheet, 2STF2220 pinout, 2STF2220 application, or 2STF2220 equivalent, key selection criteria include verified V_CE(sat) performance under high-current DC bias, thermal resistance (R_thj-amb = 89 °C/W), and guaranteed h_FE >100 across I_C = −100 mA to −1.5 A with V_CE = −2 V.

Technical Context

This PNP transistor operates as a saturated switch in low-voltage DC-DC conversion stages, where low V_CE(sat) minimizes conduction loss and high h_FE reduces required base drive current. Its −20 V V_CEO rating supports operation in 12 V and lower battery-fed systems.

The device uses ST's PB-HDC process to achieve simultaneous optimization of gain and saturation voltage - a trade-off typically constrained in conventional power bipolar processes. Thermal derating follows a linear curve down to zero power at T_case = 150 °C, with 1.4 W P_tot at T_amb = 25 °C on 1 cm² PCB copper area.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−20 V: Maximum safe collector-emitter blocking voltage with base open - suitable for 12 V rail switching
I_C (cont.)	−1.5 A: Continuous DC collector current capability - enables compact battery charger output stage design
V_CE(sat)	−0.45 V @ I_C = −1.5 A / I_B = −150 mA: Low conduction loss yields <0.7 W dissipation at full load
h_FE	≥120 @ I_C = −1.5 A / V_CE = −2 V: Ensures robust saturation with modest base drive, reducing driver complexity
R_thj-amb	89 °C/W: Junction-to-ambient thermal resistance on 1 cm² PCB - defines heatsinking requirement for sustained 1.5 A operation
f_T	Not specified in datasheet: Not characterized for RF or high-frequency switching applications
t_off	250 ns @ resistive load: Supports switching frequencies up to ~500 kHz in non-critical PWM stages

Pinout & Package

SOT-89 package: 3-pin surface-mount plastic package with exposed emitter tab for thermal conduction; standard pin assignment per JEDEC TO-243AA outline.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Emitter)	Emitter terminal	Connected to PCB thermal pad; primary heat path to board - must be soldered to ≥1 cm² copper area
Pin 2 (Base)	Control input	Receives negative base current to turn on PNP; requires current-limiting resistor in series with driver
Pin 3 (Collector)	High-side switched output	Connected to load supply rail; sinks current when saturated - polarity inverted vs NPN topology

Key Features

Feature	Design Value
Very low V_CE(sat)	−0.45 V at full rated current ensures <0.7 W conduction loss - critical for thermal budget in sealed portable enclosures
High DC current gain	h_FE ≥ 120 at I_C = −1.5 A reduces required base drive to ≤150 mA - simplifies driver stage design
PB-HDC process technology	Enables co-optimization of gain and saturation voltage - not achievable with standard planar bipolar processes
ECOPACK® compliance	Lead-free second-level interconnect meets RoHS and JEDEC JESD97 - supports environmentally compliant manufacturing

Applications

Battery Charger Switching Regulator

Portable Device Power Management

Use Scenario: Step-down DC-DC converter in wall-adaptor-powered lithium-ion battery chargers.

IC Role / Device Role / Timing Role: PNP high-side switch controlling energy transfer into charging inductor.

Use Value: Low V_CE(sat) minimizes dropout and improves efficiency at 1–2 A charge currents.

Use Scenario: Load switch enabling/disabling subsystems (e.g., display backlight, USB port) in handheld medical monitors.

IC Role / Device Role / Timing Role: Discrete PNP power switch controlled by microcontroller GPIO.

Use Value: High h_FE allows direct MCU drive without external buffer, saving board space and BOM cost.

Low-Voltage DC Power Distribution

Industrial Sensor Node Power Control

Use Scenario: 5 V or 3.3 V rail enable circuit in battery-backed data loggers.

IC Role / Device Role / Timing Role: High-side PNP pass element regulating supply to analog front-end ICs.

Use Value: −20 V V_CEO provides margin against transient overvoltage during hot-plug events.

Use Scenario: Power gating for wireless transceiver modules in remote environmental sensors.

IC Role / Device Role / Timing Role: Discrete PNP switch isolating RF section during sleep mode.

Use Value: Low I_CBO (≤0.1 µA) ensures minimal leakage current during extended sleep cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955T4G	V_CEO = −70 V, h_FE = 20–70 @ I_C = −4 A, higher V_CE(sat) (−1.3 V)	Higher voltage rating but lower gain and higher saturation loss - suited for 24 V industrial systems, not portable low-loss designs	Select only if system requires >−20 V blocking or higher peak current; avoid for battery-charger efficiency-critical use
ZTX951	V_CEO = −60 V, h_FE = 100–300 @ I_C = −1 A, SOT-89 package, V_CE(sat) = −0.5 V @ I_C = −1 A	Similar gain and package, but lower I_C rating (−1 A vs −1.5 A) and no PB-HDC process optimization	Acceptable for <1 A loads; verify thermal margin at full duty cycle due to unspecified R_thj-amb

Compared with MJD2955T4G and ZTX951, the 2STF2220 uniquely combines −1.5 A current capability, sub-0.5 V saturation voltage, and h_FE >120 in SOT-89 - making it optimal for thermally constrained, high-efficiency portable power switches where both gain and loss must be simultaneously minimized.

Availability

2STF2220 is available at Aetrix Electronics and suitable for battery charger switching regulators, portable device power management, and low-voltage DC power distribution requiring stable component supply and legacy-compatible SOT-89 discrete transistors.

Supply support for 2STF2220 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, digital, and mixed-signal ICs and discrete devices for automotive, industrial, and consumer markets.

The 2STF2220 belongs to ST's legacy power bipolar transistor family, engineered specifically for high-current, low-saturation-voltage switching in portable and battery-powered equipment.

FAQ

Is the 2STF2220 RoHS-compliant and lead-free?

Yes. The 2STF2220 is manufactured in ST's ECOPACK® package with lead-free second-level interconnect, fully compliant with RoHS Directive 2011/65/EU and JEDEC Standard JESD97. The inner box label indicates the lead-free category and maximum soldering temperature ratings.

What is the recommended PCB layout for thermal performance?

Mount the 2STF2220 on a minimum 1 cm² copper area connected to the emitter pin (Pin 1). Use multiple thermal vias under the emitter pad to inner ground/power planes. Avoid narrow traces on collector/base connections to minimize parasitic inductance during switching.

Can the 2STF2220 replace an NPN transistor in the same circuit?

No - it is a PNP device with inverted polarity: emitter connects to higher potential, collector to load, and base driven negative relative to emitter. Direct replacement requires circuit topology revision, including inversion of control logic and supply referencing.

Does ST provide SPICE models or simulation files for the 2STF2220?

No official SPICE model is published by ST for the 2STF2220. Designers should rely on datasheet curves (e.g., Figure 4 h_FE, Figure 6 V_CE(sat)) and test-circuit-based characterization (Figure 12) for behavioral modeling in switching applications.

2STF2220 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 1.5 A

Voltage - Collector Emitter Breakdown (Max):: 20 V

Vce Saturation (Max) @ Ib, Ic:: 450mV @ 150mA, 1.5A

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 100mA, 2V

Power - Max:: 1.4 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

2STF2220 FAQ

1.How can I place an order for 2STF2220 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STF2220 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 2STF2220 reliable?

The price and inventory of 2STF2220 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STF2220 is usually 5 days.

3.What payment methods are accepted for 2STF2220?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STF2220 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STF2220?

2STF2220 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STF2220 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 2STF2220?

For technical support, including 2STF2220 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STF2220 requirements.

6.How does Aetrix verify that 2STF2220 is sourced from the original manufacturer or authorized distributors?

All 2STF2220 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 2STF2220 meets industry standards.

7.What is the process for return or replacement of 2STF2220?

All 2STF2220 units undergo pre-shipment inspection (PSI). If there is an issue with 2STF2220, 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 2STF2220 part is unused and in its original packaging.

Return procedure for 2STF2220:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…