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

STMicroelectronics 2STW4466

Name: 2STW4466
Brand: STMicroelectronics
SKU: 2STW4466
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2STW4466

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-247-3

Datasheet:: 2STW4466.pdf

Description:: TRANS NPN 80V 6A TO-247-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2STW4466 from STMicroelectronics is a high-power NPN epitaxial planar bipolar transistor with V_CEO = 80 V, f_T = 20 MHz, and I_C = 6 A, designed for audio power amplifier output stages operating at up to 70 W. It features low V_CE(sat) (1.5 V @ 6 A), high gain linearity, and full characterization at 125 °C.

For engineers reviewing the 2STW4466 datasheet, 2STW4466 pinout, 2STW4466 application, or 2STW4466 equivalent, this device is selected for high-fidelity audio amplifier designs requiring stable gain, low saturation voltage, and thermal robustness in TO-247 packages.

Technical Context

This NPN transistor uses base island layout in low-voltage planar epitaxial technology to achieve linear h_FE response across collector current and low V_CE(sat) down to 0.6 V at IC = 2 A/IB = 200 mA. Its 2.08 °C/W junction-to-case thermal resistance supports sustained 60 W dissipation at T_C = 25 °C.

Characterized across temperature (up to 125 °C case), it maintains V_(BR)CEO ≥ 80 V and h_FE = 50–120 at IC = 2 A/V_CE = 4 V. Switching performance includes t_on = 0.15 ns, t_stg = 1.5 ns, and t_f = 0.1 ns under resistive load conditions (V_CC = 30 V, I_B1 = –I_B2 = 0.3 A).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Withstands 80 V collector-emitter voltage at zero base current, enabling use in 40–70 W audio output stages with ±35 V rails.
f_T	20 MHz - Sufficient bandwidth for full-audio-frequency amplification (20 Hz–20 kHz) with margin for stability compensation.
V_CE(sat)	1.5 V @ IC = 6 A - Minimizes conduction loss and heat generation in Class AB output stage operation.
h_FE	50–120 @ IC = 2 A - Provides predictable DC bias control and linearity for low-distortion audio signal reproduction.
R_thj-case	2.08 °C/W - Enables effective heatsinking for continuous 60 W power dissipation without exceeding 150 °C junction limit.
C_CBO	50 pF @ V_CB = 10 V - Limits Miller capacitance impact on high-frequency gain roll-off and stability design.

Pinout & Package

Supplied in TO-247 package: isolated metal tab (collector), 3-pin through-hole configuration with standard lead spacing and 14.5 mm minimum mounting height. Package complies with ECOPACK® environmental requirements and JEDEC JESD97 marking standards.

Pin/Terminal	Circuit Role	Design Meaning
1 (Left)	Base	Low-impedance control terminal; requires ~600 mA drive for full 6 A collector conduction.
2 (Center)	Collector	Electrically connected to metal tab; primary heat path and high-current output node.
3 (Right)	Emitter	Reference terminal for bias network; carries full load current and anchors emitter degeneration resistor.

Key Features

Feature	Design Value
High breakdown voltage	V_CEO = 80 V ensures safe operation in ±35 V supply audio amplifiers with transient headroom.
Gain linearity	h_FE variation <±15% over IC = 0.5–4 A enables consistent bias point stability across output swing.
Low saturation voltage	V_CE(sat) ≤ 1.5 V at 6 A reduces conduction loss to <9 W, easing thermal design for 70 W output.
High-temperature characterization	Fully specified at T_C = 125 °C - guarantees parametric compliance in enclosed amplifier chassis.

Applications

Hi-Fi Audio Power Amplifier

Professional Audio Mixer Output Stage

Use Scenario: Discrete Class AB output stage in stereo amplifier delivering 50 W RMS per channel into 8 Ω.

IC Role / Device Role / Timing Role: Main NPN output transistor handling peak collector currents up to 6 A with minimal crossover distortion.

Use Value: Low V_CE(sat) and linear h_FE preserve dynamic headroom and reduce second-harmonic distortion below 0.05% THD+N.

Use Scenario: Dual-rail power amplifier section in 16-channel analog mixing console output module.

IC Role / Device Role / Timing Role: Complementary NPN half of push-pull pair driving low-impedance line-level loads (600 Ω) with fast transient response.

Use Value: 20 MHz f_T and sub-nanosecond switching times support clean reproduction of complex program material up to 100 kHz bandwidth.

Active Subwoofer Amplifier

Studio Monitor Power Module

Use Scenario: High-current output stage in sealed-box active subwoofer amplifier rated for 70 W continuous into 4 Ω.

IC Role / Device Role / Timing Role: Primary power switch conducting high peak currents during bass transients while maintaining thermal stability.

Use Value: R_thj-case = 2.08 °C/W allows direct mounting to aluminum heatsink, sustaining 70 W output without forced air cooling.

Use Scenario: Bi-amplified near-field studio monitor using discrete output stage per driver (woofer/tweeter).

IC Role / Device Role / Timing Role: NPN output device in low-feedback, high-slew-rate amplifier topology optimized for transient accuracy.

Use Value: Base-island planar structure delivers consistent gain behavior across frequency and temperature, reducing need for complex compensation networks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-power audio NPN transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC5200	V_CEO = 230 V, f_T = 30 MHz, R_thj-case = 0.75 °C/W - higher voltage rating and faster switching but larger die size.	Used in higher-voltage amplifiers (>±50 V rails); less optimal for compact 40–70 W designs due to over-spec'd voltage margin.	Select when designing for >60 V supply rails or needing extended safe operating area at high V_CE.
MJE15030	V_CEO = 150 V, h_FE = 20–60 @ IC = 4 A - wider V_CEO range but lower and less linear gain than 2STW4466.	Common in legacy industrial audio gear; gain nonlinearity increases distortion in high-fidelity linear stages.	Prefer where cost sensitivity outweighs THD performance, or for repair/replacement in existing MJE15030-based designs.

Compared with 2SC5200 and MJE15030, the 2STW4466 offers superior gain linearity and optimized V_CE(sat) for mid-power hi-fi amplifiers, balancing thermal efficiency, distortion performance, and PCB footprint in TO-247.

Availability

2STW4466 is available at Aetrix Electronics and suitable for high-fidelity audio power amplifiers, professional audio mixer output stages, and active subwoofer amplifier modules requiring stable component supply and long-term BOM continuity.

Supply support for 2STW4466 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 discrete devices, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The 2STW4466 belongs to ST's high-power audio bipolar transistor family, engineered specifically for low-distortion, thermally robust output stages in discrete amplifier designs targeting audiophile-grade performance.

FAQ

Is the 2STW4466 still in active production?

No - STMicroelectronics has marked the 2STW4466 as Obsolete Product(s) per its official datasheet revision history (Rev 2, September 2008). However, Aetrix Electronics maintains legacy inventory with full traceability and supports long-life design continuity for existing amplifier platforms.

What is the recommended heatsink interface for the TO-247 package?

A thermally conductive insulating pad (e.g., Sil-Pad 2000 series) or mica washer with silicone grease is required between the metal tab (collector) and heatsink. Mounting torque must not exceed 0.7 N·m to avoid package deformation and bond wire damage.

Can the 2STW4466 be used in parallel configurations?

Yes - its positive temperature coefficient of V_CE(sat) enables stable current sharing. Use individual emitter resistors (0.1–0.22 Ω, 2 W) and matched base drive impedance to ensure balanced conduction across paralleled devices.

Does the 2STW4466 have automotive qualification?

No - the device is not AEC-Q101 qualified and lacks automotive-specific stress testing or failure reporting. ST explicitly states in the datasheet that non-automotive-grade parts carry no warranty for use in vehicles or safety-critical systems.

2STW4466 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 6 A

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

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 600mA, 6A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 2A, 4V

Power - Max:: 60 W

Frequency - Transition:: 20MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

2STW4466 FAQ

1.How can I place an order for 2STW4466 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STW4466 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 2STW4466 reliable?

The price and inventory of 2STW4466 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STW4466 is usually 5 days.

3.What payment methods are accepted for 2STW4466?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STW4466 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STW4466?

2STW4466 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STW4466 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 2STW4466?

For technical support, including 2STW4466 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STW4466 requirements.

6.How does Aetrix verify that 2STW4466 is sourced from the original manufacturer or authorized distributors?

All 2STW4466 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 2STW4466 meets industry standards.

7.What is the process for return or replacement of 2STW4466?

All 2STW4466 units undergo pre-shipment inspection (PSI). If there is an issue with 2STW4466, 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 2STW4466 part is unused and in its original packaging.

Return procedure for 2STW4466:

1.Submit a request within 90 days.

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

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