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

STMicroelectronics STN9260

Name: STN9260
Brand: STMicroelectronics
SKU: STN9260
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STN9260

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: STN9260.pdf

Description:: TRANS PNP 600V 0.5A SOT-223

Quantity:: RFQ Add To RFQ list

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Inventory:1,284

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Product details

Overview

STN9260 from STMicroelectronics is a high-voltage fast-switching PNP power transistor in SOT-223 package, rated for -600 V V_CE, -0.5 A continuous collector current, and 1.6 W total dissipation at 25 °C. It employs multi-epitaxial planar technology with cellular emitter structure and planar edge termination to achieve fast switching (t_r = 200 ns, t_f = 150 ns) while maintaining wide RBSOA - used in low-cost switch-mode power supplies and fluorescent/LED lighting ballasts.

For engineers reviewing the STN9260 datasheet, STN9260 pinout, STN9260 application, or STN9260 equivalent, key selection factors include its -600 V blocking capability, -1 V V_CE(sat) at -100 mA/-10 mA drive, h_FE range of 50–140, R_thJA = 78 °C/W on 1 cm² PCB, and suitability for non-repetitive pulse and resistive-load switching circuits.

Technical Context

This PNP bipolar junction transistor uses high-voltage multi-epitaxial planar process to support sustained -600 V collector-emitter voltage under zero-base-current conditions (V_CEO) and -600 V under open-emitter bias (V_CES). Its cellular emitter layout and planar edge termination optimize trade-offs between breakdown robustness and switching speed.

Designed for hard-switched, medium-frequency operation (e.g., <50 kHz SMPS), it delivers 200 ns rise time and 150 ns fall time under V_CC = -200 V, I_C = -0.1 A, with base drive of -10 mA / +20 mA. Safe operating area is validated up to single-pulse 0.5 A at -200 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-600 V - supports primary-side switching in offline flyback and forward converters up to 380 V DC bus.
I_C (cont.)	-0.5 A - enables cost-effective replacement of higher-power devices in sub-10 W lighting drivers.
V_CE(sat)	-1 V @ I_C = -100 mA, I_B = -10 mA - limits conduction loss to ≤100 mW in linear-regulated lamp control stages.
t_r/t_f	200 ns / 150 ns - allows stable operation at 30–50 kHz without excessive switching loss or EMI.
R_thJA	78 °C/W on 1 cm² PCB - requires minimal copper area for thermal management in compact LED driver PCBs.
h_FE	50–140 @ I_C = -10 to -20 mA - ensures reliable base drive margin across production lots and temperature.

Pinout & Package

SOT-223 package with standard 4-pin configuration: tab-connected collector (Pin 2), emitter (Pin 1), base (Pin 3), and auxiliary emitter (Pin 4). The exposed metal tab (Pin 2) serves as both collector terminal and primary thermal path to PCB.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (E)	Emitter	Main emitter connection; referenced to system ground in common-emitter configurations.
Pin 2 (C)	Collector (tab)	Exposed metal tab electrically connected to collector; provides low-inductance, high-current path and primary thermal interface.
Pin 3 (B)	Base	Control input for turn-on/turn-off; requires negative current injection for PNP activation.
Pin 4 (E2)	Auxiliary emitter	Second emitter bond wire; improves current sharing and reduces parasitic inductance in high-dI/dt switching.

Key Features

Feature	Design Value
High-voltage blocking	-600 V V_CEO enables direct use in 230 VAC rectified bus applications without snubber networks.
Fast switching performance	200 ns rise / 150 ns fall time reduces transition losses in 30–50 kHz SMPS topologies.
Wide RBSOA	Validated safe operating area up to single-pulse 0.5 A at -200 V supports surge-tolerant lighting startup.
Cellular emitter structure	Improves current uniformity and reduces localized heating during conduction, enhancing reliability in thermally constrained fixtures.

Applications

Fluorescent Lamp Ballast

LED Driver (Non-Isolated Buck)

Use Scenario: High-frequency electronic ballast for T5/T8 lamps operating at 25–65 kHz.

IC Role / Device Role / Timing Role: Main switching transistor in series-resonant inverter stage; commutates lamp current at zero-voltage switching points.

Use Value: -600 V rating withstands lamp ignition transients up to 1 kV; fast t_f minimizes dead-time losses during resonant reversal.

Use Scenario: Constant-current buck regulator for 12–24 V LED strings in commercial downlights.

IC Role / Device Role / Timing Role: Low-side PNP switch controlling LED current via emitter-follower feedback loop.

Use Value: -1 V V_CE(sat) keeps dropout loss below 100 mW at 350 mA; h_FE ≥50 ensures stable regulation with simple resistor-based base bias.

Offline Flyback Converter (Auxiliary)

DC-DC Boost Pre-regulator

Use Scenario: Auxiliary switch in multi-output flyback supplying bias rails for gate drivers and controllers.

IC Role / Device Role / Timing Role: Secondary-side PNP switch regulating auxiliary winding output; operates in discontinuous conduction mode.

Use Value: R_thJA = 78 °C/W allows self-cooling on small PCB pads; -7 V V_EBO rating prevents base-emitter breakdown during winding polarity reversals.

Use Scenario: Boost pre-regulator in 12 V automotive LED headlamp modules converting 9–16 V input to stable 24 V bus.

IC Role / Device Role / Timing Role: Medium-voltage PNP switch in boost switch node; handles peak currents up to -1 A during cold-crank events.

Use Value: I_CM = -1 A (5 ms) sustains load dumps; -600 V V_CES provides margin against inductive kickback from boost inductor.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage PNP switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STN9360	-800 V V_CEO, same SOT-223 package, identical pinout, but higher V_CE(sat) (-1.2 V).	Supports higher-input AC systems (e.g., 3-phase rectified); less efficient at low I_C due to higher saturation loss.	Choose when >600 V margin is required and thermal budget allows +0.2 V V_CE(sat).
MJD2955T4G	-70 V V_CEO, TO-220 package, lower cost, but insufficient for 230 VAC-derived buses.	Limited to low-voltage DC-DC converters (<100 V input); incompatible footprint and thermal profile.	Select only for <100 V applications where SOT-223 mounting is not required.

Compared with STN9260, STN9360 offers higher voltage headroom at the cost of increased conduction loss, while MJD2955T4G is unsuitable for mains-connected lighting due to its -70 V rating - making STN9260 the optimal balance of voltage capability, thermal efficiency, and SMT manufacturability.

Availability

STN9260 is available at Aetrix Electronics and suitable for fluorescent ballasts, LED drivers, offline flyback auxiliaries, and DC-DC boost pre-regulators requiring stable component supply across industrial lighting and consumer power electronics programs.

Supply support for STN9260 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STN9260 belongs to ST's high-voltage bipolar transistor product line, engineered specifically for cost-sensitive, medium-power switching applications in lighting and AC/DC conversion where robustness and SMT compatibility are critical.

FAQ

What is the maximum safe operating junction temperature for STN9260?

The absolute maximum junction temperature (T_J) is 150 °C per the datasheet. Operation above this limit risks permanent degradation of the epitaxial layers and reduced h_FE stability. Derating begins at 25 °C ambient, with R_thJA = 78 °C/W limiting usable power to ~1.1 W at 70 °C ambient.

Can STN9260 be used in avalanche mode?

No - STN9260 is not rated or characterized for repetitive avalanche operation. Its safe operating area curves exclude avalanche energy limits, and the device lacks built-in avalanche ruggedness design features. Use only within the defined RBSOA boundaries shown in Figure 2.

Is Pin 4 (auxiliary emitter) required to be connected externally?

Yes - Pin 4 must be connected to the main emitter node (Pin 1) externally on the PCB. It is not internally bonded and serves to reduce emitter inductance and improve current distribution during fast switching transitions.

Does STN9260 meet RoHS and REACH requirements?

Yes - STN9260 is manufactured in ECOPACK®-compliant SOT-223 packages meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead-free finish and halogen-free molding compound are confirmed in ST's official ECOPACK® documentation (Doc ID 18326 Rev 2, page 7).

STN9260 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 600 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 10mA, 100mA

Current - Collector Cutoff (Max):: 10µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 20mA, 5V

Power - Max:: 1.6 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

STN9260 FAQ

1.How can I place an order for STN9260 through Aetrix?

Please submit a Request for Quotation (RFQ) for STN9260 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 STN9260 reliable?

The price and inventory of STN9260 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STN9260 is usually 5 days.

3.What payment methods are accepted for STN9260?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STN9260 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STN9260?

STN9260 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STN9260 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 STN9260?

For technical support, including STN9260 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STN9260 requirements.

6.How does Aetrix verify that STN9260 is sourced from the original manufacturer or authorized distributors?

All STN9260 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 STN9260 meets industry standards.

7.What is the process for return or replacement of STN9260?

All STN9260 units undergo pre-shipment inspection (PSI). If there is an issue with STN9260, 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 STN9260 part is unused and in its original packaging.

Return procedure for STN9260:

1.Submit a request within 90 days.

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

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