TOSHIBA 2SD1554

Mfr. Part

2SD1554

Manufacturer

Toshiba Electronic Devices and Storage Corporation (TAEC). Y-IC is a quality distributor of Toshiba products and we will provide you with the best products, fast service, and dependable support.

Detailed Description

High-voltage, high-speed NPN power transistor from Toshiba in a TO-3PF power package. Commonly used in TV/CRT horizontal deflection stages and other demanding high-power switching circuits. Designed for robust operation, fast turn-on/turn-off, and reliable thermal handling when mounted to a heatsink.

Key Features

NPN bipolar power transistor for high-voltage switching

TO-3PF through-hole power package with large mounting surface

Fast switching for deflection and power conversion applications

Rugged construction for high pulse currents and inductive loads

Suitable for use with external heatsinks to manage heat

Stable performance with proper gate/base drive and layout

Broad operating temperature range (see datasheet for limits)

Key Advantages

Reliable brand performance from Toshiba for professional equipment

Strong thermal path via TO-3PF for better heat dissipation

High voltage handling for line output stages and similar tasks

Fast switching improves efficiency and reduces losses

Robust against voltage spikes when designed with proper snubbing

Easy mechanical mounting in power chassis designs

Packaging

Type: TO-3PF power package, through-hole

Material: Molded high-temperature epoxy plastic body with metal backing plate for heat transfer

Size: Standard TO-3PF mechanical outline; refer to datasheet mechanical drawing for exact dimensions

Pin configuration: 3 leads; typical assignment is Pin 1 Base, Pin 2 Collector, Pin 3 Emitter; metal back plate/tab usually tied to Collector (verify on the datasheet and PCB layout)

Thermal characteristics: Designed for direct heatsink mounting; use thermal compound and, if needed, insulating pad depending on electrical isolation requirements; low junction-to-case thermal resistance compared to smaller packages

Electrical properties: High-voltage NPN transistor optimized for fast switching and pulsed operation; parameters such as Vce, Ic, Pd, fT, and gain depend on exact spec—see datasheet for guaranteed limits

Package code: 1034 as provided

Shipment quantity: 2000 units available (bulk or tray per supplier standard; confirm packing on order)

Lifecycle

Status: Many high-voltage CRT deflection transistors have been discontinued by multiple makers as CRT markets declined. Availability can be limited; check current stock and lead time with us.

Potential equivalents or alternatives (selection depends on exact electrical specs and application; confirm with datasheets and our engineering support):

- Toshiba 2SD1553

- Toshiba 2SD1555

- STMicroelectronics BUH515 series (e.g., BUH515)

- STMicroelectronics BUH517 series

- Sanken 2SC5902

- Other high-voltage NPN deflection/power transistors with TO-3PF/TO-3PL packages

If an exact equivalent is not confirmed for your circuit, contact our sales team via the Y-IC website for detailed cross-reference support and recommendations tailored to your design.

Key Application Areas

TV/CRT horizontal deflection output stages

High-voltage, high-speed switching in power supplies

Pulse and inductive load driving with appropriate snubber networks

Industrial power electronics where TO-3PF mounting and high voltage are required

Datasheet

Our website provides the most authoritative datasheet for the current product model. We recommend downloading the datasheet on this page to review full electrical limits, mechanical drawings, and application notes.

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