--- title: "PCX-7421 | 21.5 A Output Current Laser Diode Driver" date: 2025-01-08T10:21:06Z modified: 2026-06-17T13:16:03Z permalink: "https://www.berkeleynucleonics.com/pcx-7421-215-output-current/" type: page status: publish excerpt: "" wpid: 19784 --- [ ![](https://www.berkeleynucleonics.com/wp-content/uploads/banner_configurator_laser_diodes.png) ](/laser-diode-drivers-and-modules-standard-and-custom-versions-available) [![Laser Diode Driver PCX-7421](https://www.berkeleynucleonics.com/wp-content/uploads/pcx-7421_front_dim_web.jpg) ](https://www.berkeleynucleonics.com/wp-content/uploads/pcx-7421_front_dim_web.jpg) [![Laser Diode Driver PCX-7421](https://www.berkeleynucleonics.com/wp-content/uploads/pcx-7421_front_web.jpg) ](https://www.berkeleynucleonics.com/wp-content/uploads/pcx-7421_front_web.jpg) [![Laser Diode Driver PCX-7421](https://www.berkeleynucleonics.com/wp-content/uploads/pcx-7421_back_tilt_web.jpg) ](https://www.berkeleynucleonics.com/wp-content/uploads/pcx-7421_back_tilt_web.jpg) [![Laser Diode Driver PCX-7421](https://www.berkeleynucleonics.com/wp-content/uploads/pcx-7421_back_web.jpg) ](https://www.berkeleynucleonics.com/wp-content/uploads/pcx-7421_back_web.jpg) [ ![powered by bioz](https://cdn.bioz.com/assets/favicon.png) Powered by Bioz ](https://www.bioz.com/) - [ Quote ](/get-quote/?interested_product=PCX-7421%20|%2021.5%20A%20Output%20Current) - [ Contact ](/contact-us/) - [ Datasheet ](#technical-resources-section) - [ Price List ](/access-pricelist/) #### PCX-7421 | 21.5 A Output Current Laser Diode Driver These air-cooled drivers deliver precise, high-current control for diode lasers, bars, and arrays in pulsed (QCW) and continuous wave (CW) modes—ideal for research, industrial, medical, defense, and pumping applications. ##### PCX-7421 (Pulsed/QCW Focus): - Adjustable pulsed output current: 50 mA – 21.5 A - Pulse width: 50 ns – 500 ms - Rise/fall time: <25 ns - Compliance voltage: 24 V - Internal pulse rep rate: 40 Hz – 100 kHz - External trigger rep rate: single-shot to 1 MHz - High-power, air-cooled design for reliable operation ##### PCX-7121 (CW + QCW Capabilities): - CW (DC) output: 0.05 A – 5.8 A - QCW/pulsed output: 50 mA – 21.5 A - Bias + pulse mode: CW bias 0.05 A – 5.8 A, pulse up to 15.7 A above bias - Independent triggering of bias current and main pulse (advanced feature) - Versatile for combined continuous and pulsed drive scenarios Both models provide exceptional performance, fast edges, and flexibility for driving high-power laser diodes with accuracy and repeatability. #### Publications ##### [Features](#features-section) ##### [Specifications](#specifications-section) ##### [Tech Resources](#technical-resources-section) ##### [Media](#media-section) ##### [Downloable Resources](#downloadable-section) ##### [Price List](#pricelist-section) #### Overview ##### Features - Pulsed output current of 50 mA to 21.5 A - CW output current of 0.50 A to 5.8 A - Bias current for 3.0 A to 5.8 A - Output voltage up to 24 V - Output power up to 250 W - Easy to read OLED display - RS-232 and USB computer interfaces ##### Applications - The PCX-7421 is designed to drive laser diodes, bars and arrays with forward voltage drops up to 24 V #### Specifications **Compliance Voltage** 24 V **Max Current Amplitude** 21.5 A **Rise/Fall Time** 25 ns **Max Frequency** 100 kHz (1 MHz with external trigger) **Pulse Engine (Trigger)** External, Internal **Remote Control** RS232, USB **Form Factor** Benchtop **Cooling** Forced Air **Polarity** Positive **Pulse Width** 100 ns – 500 ms (100% duty cycle up to 250W with external trigger) **Maximum Output Power** 250 W **Shipping Dimensions (in)** 28 x 17 x 11 #### Technical Resources [ PCX-7421 Datasheet v2.0](https://www.berkeleynucleonics.com/download/27632/?tmstv=1781702163) #### Downloadable Resources Downloadable resources such as datasheets, firmware, software, drivers and products manuals. Alternatively, you can browse resources directly by visiting our [downloads page](/downloads). - [Product Datasheets](/downloads#tm-datasheets) - [Product Firmware](/downloads#rf-firmware) - [Product Software and Drivers](/downloads#tm-softwaredrivers) - [Product Manuals](/downloads#tm-manuals) #### Media ## Playlist ![DEI Laser Diode Drivers for Education](https://img.youtube.com/vi/v-Bfmr6JFQg/maxresdefault.jpg) #### DEI Laser Diode Drivers for Education 1:40 ![DEI Laser Diode Drivers for LiDAR Applications](https://img.youtube.com/vi/dnQEd6tH-4o/maxresdefault.jpg) #### DEI Laser Diode Drivers for LiDAR Applications 2:07 ![Demystifying Laser Diode Drivers: Current Sources versus Voltage Sources Rev 2019](https://img.youtube.com/vi/AnSVQYDvJE0/maxresdefault.jpg) #### Demystifying Laser Diode Drivers: Current Sources versus Voltage Sources Rev 2019 21:10 ![High Voltage Power Supply & Pulse Generator Webinar! What You Need to Know](https://img.youtube.com/vi/E8cJDr2VDRM/maxresdefault.jpg) #### High Voltage Power Supply & Pulse Generator Webinar! What You Need to Know 44:38 #### Price Lists [ Berkeley Nucleonics Price List 2026](https://www.berkeleynucleonics.com/download/19881/?tmstv=1781702163) [ ![](data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' viewBox%3D'0 0 1105 100'%2F%3E) ](https://academy.berkeleynucleonics.com/)