Product Lines
Thyristor Switches with current depending on-time
Cost-efficient charge & discharge solutions in the Kiloampere range.
Low Power Universal Switches with fixed on-time
General pulse applications, charge & discharge applications.
    High di/dt Switches with fixed on-time
High current, excellent burst capability, fast charge & discharge applications.
Ultrafast Switches with fixed on-time
High current, high di/dt, ultrafast charge & discharge applications.
Low Resistance Switches with fixed on-time
High current, low power losses. Charge & discharge applications.
    Low Power Universal Switches with variable on-time
General pulse & switching applications, fast rise time, high frequency.
High di/dt Switches with variable on-time
High current at moderate frequency, fast rise time.
    Low Capacitance Switches with variable on-time
Low coupling capacitance. LC2 topology for excellent transient immunity.
    Low Resistance Switches with variable on-time
Very low turn-on losses due to Slicon Carbide (SiC) and Trench-FET technology.
AC Switches with variable on-time
Bidirectional switches for positive and negative voltages without pole change.
IGBT Switches with variable on-time
High di/dt and current capability at moderate frequency. True on-off switch.
MCT Thyristor Switches with variable on-time
High di/dt and current capability at moderate frequency. True on-off switch.
Push-Pull Switches with variable on-time
Safe half-bridge circuit for true square wave pulses.
AC Push-Pull Switches with variable on-time
Safe half-bridge circuit for positive and negative voltages without pole change.
Laboratory Pulser, OEM Pulser, Pockels Cell Driver
Ready to use solutions for various high voltage pulse applications.
    Diode Assemblies for BEHLKE Switches, Series FDA
Fast free-wheeling diodes & networks. Very low reverse recovery time & low forward voltage drop.
Diode Network  
Dielectric Liquid Cooling for BEHLKE Switches (DLC)
Intelligent pump units with built-in sensors, radiators, heat exchanger, dielectric coolant etc.
High Voltage Part Components and Accessories
Resistors, capacitors, fast high voltage probes, ultrafast high voltage attenuators.

PRODUCT SELECTION: High voltage and pulsed power applications imply always a certain risk of sparking and flash over by nature, especially if the ambient conditions, operating conditions, or load conditions change unexpectedly. Therefore, the peak current capability of a solid-state switch should be always as high as possible, at  least higher than the possible short circuit current of the application. Regarding the selection of voltage rating we suggest a safety margin of  >5% for MOSFET switches and >20% for all bipolar switches (IGBT, MCT, SCR) to minimize the risk of damage by unexpected voltage fluctuation or possible flyback-voltage.

The long-term reliabillty (Mean Time Between Failures, MTBF) of a high voltage solid-state switch depends on the operating temperature. Therefore, we highly recommend to operate  the switches only at moderate temperatures whenever possible. This is primarily achieved by sufficient on-resistance and current capability to minimize switching losses. Low stray capacitance reduce the power dissipation at high frequency. Please refer to our
General Instructions for the power loss calculations. In cases where the calculated power dissipation exceeds the Pd(max) rating of the switch, appropriate cooling options must be added. Please note, that the individual  Pd(max) ratings are always referred to a housing temperature of 25C. This laboratory test condition is of course not given in practice. Designers must therefore consider increased ambient temperatures as well as the actual housing temperature in operation. BEHLKE offers a broad selection of cooling options for every situation. Designers can choose between ceramic cooling surfaces, cooling fins, cooling flanges and liquid cooling with water or  dielectric coolants (Dircet Liquid Cooling, DLC). Please refer to the following product surveys and the individual data sheets for further information.
TECHNICAL SUPPORT:  In order to exclude any misunderstanding and to work efficiently to the benefit of our customers, we do not provide any oral consultation or technical support on the phone, except in unavoidable urgent cases. Technical support is generally provided via e-mail correspondence.

For a first time consultation, please carefully fill in our
questionnaire or describe your application as precisely as possible on a separate sheet and send it to BEHLKE by email or fax. We assure you, that all your technical information will be handled strictly confidential. Submitted Non Disclosure Agreements (NDA) will be legally verified and signed within one working day. Any qualified aftersale support requires a complete set of information about your application. This includes a drawn or sketched circuit diagram, timing diagram, measuring values and oscilloscope screen shots, as well as reliable information about the actual operating conditions (voltage, current, frequency, pulse width, duty cycle, transition times, operating temperature etc.). Additional pictures of the experimental set-up can help to analyze and troubleshoot your application more efficiently and faster.

The processing of technical inquiries may take from one day up to several weeks, depending on the complexity of the application, the availability of the individual experts and the quality of the technical information provided by the customer.

Please also note that BEHLKE is a part components manufacturer. We provide free support for our products but we do not develop applications unless we are explicitly ordered. We also do not overtake any responsibility or warranty for the function of our products in customer applications. Thank you for your understanding.
35 Years                
   < Flange Housing
+ Cooling Fins

Opt. FH+CF
      < Tubular Housing
+ Liquid Cooling
     < Cu Cooling Flange    
Option GCF    
   BEHLKE solid-state
switches can be equipped
with various housing, connector and
cooling options as well as with options for different
 electrical behavior to meet individual design requirements.
Applicable options are listed in the related product surveys A to G
                   Compact Switch
BEHLKE products are 100% leadfree, RoHs and 3TG compliant. Certificates are available on request.
REV 08-JAN-2022

Product Lines