High Power Semiconductors

Specialist Electronic Semiconductor Suppliers

Welcome to Harmsworth, Townley & Co. Ltd:  Specialist providers of High Power Semiconductors to the power rectification industry for 70 years.

Whether you need spares, repairs, maintenance, breakdown response, refurbishment, OEM – or are just in need of a part quickly– we can help you. We provide a fast-response service in case of breakdown, send goods worldwide and even offer a same-day delivery for emergency breakdowns.

Our bespoke service is very popular – creating components to fit your requirements. We often provide modern equivalents of obsolete/no longer manufactured devices – whether it’s for on those off-shore oil rigs or keeping underground trains running!

Customers from countries outside the UK & Europe

Customers in the UK & Europe can buy products from this website and have them delivered directly to them.

If you are based outside the UK & Europe and wish to purchase products from us please contact us with the details of the products you wish to purchase and your location. We’ll get back to you with a delivery cost for your desired order.





Popular Products


IXYS UK Westcode re-launch 7kA welding diode

IXYS UK Westcode re-launch 7kA welding diode

IXYS UK Westcode Ltd. Announces the re-launch of a 7kA welding diode in industry standard 8.5mm low profile ceramic package. The 200V to 400V device has been reengineered to meet the demanding needs of the application, while retaining an acceptable balance against the...