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

STMicroelectronics 2STF2280

Name: 2STF2280
Brand: STMicroelectronics
SKU: 2STF2280
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2STF2280

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: 2STF2280.pdf

Description:: TRANS PNP 80V 2A SOT-89

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2STF2280 from STMicroelectronics is a PNP bipolar power transistor fabricated using PB-HCD (Power Bipolar High Current Density) technology, designed for low-voltage, high-current switching applications. It delivers V_CE(sat) = –15 mV at I_C = –100 mA / I_B = –10 mA, h_FE = 140–300 (I_C = –100 mA to –1 A), and f_T = 50 MHz, enabling efficient operation in DC-DC converter output stages.

For engineers reviewing the 2STF2280 datasheet, 2STF2280 pinout, 2STF2280 application, or 2STF2280 equivalent, key selection criteria include verified low saturation voltage under high current, guaranteed h_FE stability across load range, SOT-89 thermal performance (R_thJA = 89 °C/W on 1 cm² PCB), and suitability for fixed-frequency PWM switching in compact power regulators.

Technical Context

This PNP transistor operates with reverse-polarity biasing: collector at most negative potential, emitter tied to ground or higher rail. Its PB-HCD process enables simultaneous optimization of current gain and saturation voltage-unlike conventional PNP structures where h_FE degrades as V_CE(sat) is reduced.

The device supports pulsed peak currents up to 4 A (t_P < 5 ms) and maintains V_CEO(sus) = –80 V at I_C = –10 mA, confirming robust secondary breakdown immunity essential for unclamped inductive switching in buck converter freewheeling paths.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–80 V: Maximum safe collector-emitter reverse bias before avalanche, critical for input-side transient protection in negative-rail converters
I_C	2 A continuous: Sustained conduction capability for 1–2 W output stage loads without forced cooling
V_CE(sat)	–15 mV @ I_C = –100 mA / I_B = –10 mA: Enables <0.15% conduction loss in low-dropout linear regulators
h_FE	140–300 @ I_C = –100 mA to –1 A: Ensures stable base drive margin across full load range in current-mode control
f_T	50 MHz @ I_C = –0.1 A: Supports clean turn-off in 500 kHz–1 MHz switching converters without excessive storage time
R_thJA	89 °C/W on 1 cm² PCB: Predictable junction temperature rise for thermal design in space-constrained SMT layouts

Pinout & Package

SOT-89 package: surface-mount, 3-terminal, single-row thermally enhanced plastic case with exposed emitter pad for improved heat dissipation. Dimensions per Doc ID 16984 Rev 1: D = 4.4–4.6 mm, E = 2.29–2.60 mm, H = 3.94–4.25 mm, L = 0.89–1.20 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Tab/Exposed Pad)	Emitter	Internally connected to emitter semiconductor region; must be soldered to copper pour for thermal and electrical grounding
2	Base	Current-controlled input node; requires ≥10 mA drive for full saturation at 1 A collector current
3	Collector	Main current-carrying terminal; reverse-biased during normal operation in high-side switch configurations

Key Features

Feature	Design Value
Low V_CE(sat)	–15 mV at light load ensures <15 mW conduction loss-critical for battery-powered 3.3 V or 5 V regulator efficiency
High h_FE consistency	Min 140 at 100 mA and min 80 at 1 A guarantees predictable base drive sizing across entire operating range
Fast f_T	50 MHz transition frequency enables sub-20 ns turn-off delay, reducing switching losses in high-frequency DC-DC stages
Robust V_CEO(sus)	–80 V sustaining voltage validated at I_C = –10 mA confirms reliable operation under inductive kickback in flyback snubbers

Applications

DC-DC Buck Converter

Voltage Regulator

Use Scenario: Used as synchronous rectifier or freewheeling switch in non-isolated buck converters delivering 1–2 A at 3.3 V or 5 V from 12 V input.

IC Role / Device Role: PNP power switch handling reverse current path during low-side FET off-time; emitter grounded, collector tied to inductor node.

Use Value: Ultra-low V_CE(sat) minimizes forward conduction loss, improving efficiency by >0.8% vs. standard PNP alternatives at 1 A load.

Use Scenario: Employed in adjustable linear regulator topologies (e.g., LM317-based negative output) requiring high-current pass element with minimal dropout.

IC Role / Device Role: Series pass transistor controlling output voltage via emitter-follower configuration with feedback to base.

Use Value: Stable h_FE across load ensures precise current mirror accuracy in reference circuits, maintaining ±1% output regulation.

General-Purpose Switching

Load Switch for Negative Rails

Use Scenario: Replaces mechanical relays in industrial I/O modules switching 24 V DC solenoids or indicator LEDs with 1–2 A peak demand.

IC Role / Device Role: High-side switch controlling current flow from negative supply rail to grounded load.

Use Value: Fast switching speed (enabled by 50 MHz f_T) reduces contact bounce artifacts and enables PWM dimming up to 1 kHz.

Use Scenario: Isolates negative voltage domains (e.g., –5 V, –12 V) in mixed-rail systems such as audio amplifiers or sensor signal conditioning.

IC Role / Device Role: Load switch placed between negative supply and load, with base driven by logic-level controller referenced to system ground.

Use Value: Verified –80 V V_CEO rating prevents breakdown during hot-swap transients or reverse-polarity faults.

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_CE(sat) = –1.8 V @ I_C = –4 A - 120× higher than 2STF2280 at same current	Designed for higher-power linear regulators; unsuitable for high-efficiency SMPS due to excessive conduction loss	Select only when absolute maximum I_C > 2 A is required and efficiency is secondary to ruggedness
ZTX951	h_FE = 100–200 @ I_C = –1 A - lower gain consistency and no specified f_T	Limited to ≤200 kHz switching; lacks PB-HCD process benefits for low-V_sat/high-h_FE co-optimization	Acceptable for cost-sensitive 50–100 kHz applications where 50 MHz bandwidth is unnecessary

Compared with MJD2955T4G and ZTX951, the 2STF2280 uniquely balances ultra-low saturation voltage, high and stable current gain, and RF-grade switching speed-making it optimal for compact, high-frequency, efficiency-critical PNP switching where thermal headroom is constrained.

Availability

2STF2280 is available at Aetrix Electronics and suitable for DC-DC converters, voltage regulators, and general-purpose switching equipment requiring stable component supply and consistent parametric performance across production batches.

Supply support for 2STF2280 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, Switzerland, specializing in power management, analog, microcontrollers, and automotive ICs.

The 2STF2280 belongs to ST's high-performance bipolar power transistor family, engineered specifically for low-voltage, high-efficiency switching in space-constrained power conversion systems.

FAQ

Is the 2STF2280 RoHS-compliant and halogen-free?

Yes. The 2STF2280 is manufactured in ST's ECOPACK®-compliant SOT-89 package, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. Full compliance documentation is available in ST's ECOPACK® database at www.st.com.

What is the recommended PCB layout for thermal performance?

Mount the 2STF2280 on a minimum 1 cm² copper pour connected to the emitter (pin 1/tab) for optimal heat dissipation. Use ≥0.5 mm trace width for collector and base connections, and avoid thermal isolation gaps near the tab area to maintain R_thJA ≤ 89 °C/W as specified.

Can the 2STF2280 replace an NPN transistor in the same circuit?

No. As a PNP device, the 2STF2280 requires reversed polarity biasing: emitter more positive than collector. Direct substitution for an NPN would invert control logic and likely cause latch-up or destruction. Circuit redesign-including base drive polarity and signal referencing-is mandatory.

Does ST provide SPICE models for the 2STF2280?

ST does not publish a dedicated SPICE model for the 2STF2280. However, its electrical characteristics (V_CE(sat), h_FE, f_T, C_ob) are fully specified in Doc ID 16984 Rev 1, enabling accurate behavioral modeling in circuit simulators using standard bipolar transistor templates with calibrated parameters.

2STF2280 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):: 2 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 140 @ 100mA, 2V

Power - Max:: 1.4 W

Frequency - Transition:: 50MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

2STF2280 FAQ

1.How can I place an order for 2STF2280 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STF2280 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 2STF2280 reliable?

The price and inventory of 2STF2280 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STF2280 is usually 5 days.

3.What payment methods are accepted for 2STF2280?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STF2280 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STF2280?

2STF2280 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STF2280 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 2STF2280?

For technical support, including 2STF2280 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STF2280 requirements.

6.How does Aetrix verify that 2STF2280 is sourced from the original manufacturer or authorized distributors?

All 2STF2280 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 2STF2280 meets industry standards.

7.What is the process for return or replacement of 2STF2280?

All 2STF2280 units undergo pre-shipment inspection (PSI). If there is an issue with 2STF2280, 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 2STF2280 part is unused and in its original packaging.

Return procedure for 2STF2280:

1.Submit a request within 90 days.

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

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