TDK Lambda Americas Inc
TDK World Wide


Power Supply Products

High Performance Quarter Bricks Target COTS and Harsh Environment Applications

San Diego, CA – June 2016 –

TDK Corporation announces the introduction of the TDK-Lambda HQA120 isolated DC-DC converters.  Rated at 120W, the HQA120 has been qualified with methods consistent with MIL-STD-883 and MIL-STD-202, making it suitable for use in COTS and harsh environment industrial equipment.  Initially available with 12V, 24V and 28V outputs, the encapsulated quarter bricks accept a wide range DC input of 9V to 40V, withstanding a 50V surge for 10 seconds. 

 A choice of two grades is offered:  -S for standard industrial applications or -M using wide temperature, high grade components and additional product testing for enhanced reliability.  This includes functional testing at low, high and room temperatures, a 96-hour extended burn-in period and 10 temperature cycles.  With typical efficiencies of up to 89%, internal heating is minimized allowing the HQA converters to operate in high ambient temperatures of up to 115oC and a minimum of -55 oC (M grade) or -40oC (S grade).  No opto-couplers are used in the design and the switching frequency is fixed at 270 kHz for simplified noise filtering.

 The converter pinout follows the industry standard five pin quarter brick footprint featuring negative logic remote on/off and +/- remote sense.  Two package styles are offered; a flanged type measuring 2.39” x 2.2” x 0.5” and a non-flanged version measuring 2.39” x 1.54” x 0.5”. 

 Input-to-output and input to baseplate isolation is 2,250Vdc (basic), and the converters are safety certified to UL/CSA/EN 60950-1 (2nd edition), carrying the CE mark in accordance with the LV Directive and RoHS Directives.

 More information can be obtained at the following TDK-Lambda Americas website,, or by calling 800-LAMBDA-4.  Product availability for the HQA series can be found via the link to TDK-Lambda’s distributor network (see “Check Distributor Stock to Buy”) at


Major applications

COTS (Commercial off the Shelf), vehicle, airborne, communications and harsh industrial.

Main features and benefits

  • Industry standard 1/4 brick pinout
  • Efficiencies up to 89% at 24Vdc input
  • Operating ambient temperatures up to 115oC
  • No opto-couplers used

Major specifications


About TDK Corporation

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize ferrite, a key material in electronic and magnetic products. TDK's portfolio includes electronic components, modules and systems* marketed under the product brands TDK and EPCOS, power supplies, magnetic application products as well as energy devices, flash memory application devices, and others. TDK focuses on demanding markets in the areas of information and communication technology and consumer, automotive and industrial electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2016, TDK posted total sales of USD 10.2 billion and employed about 92,000 people worldwide.

* The product portfolio includes ceramic, aluminum electrolytic and film capacitors, ferrites, inductors, high-frequency components such as surface acoustic wave (SAW) filter products and modules, piezo and protection components, and sensors.

About TDK-Lambda

TDK-Lambda Corporation, a group company of TDK Corporation, is a leading global power supply company providing highly reliable power supplies for industrial equipment worldwide. TDK-Lambda Corporation meets the various needs of customers with our entire range of activities, from research and development through to manufacturing, sales, and service with bases in five key areas, covering Japan, Europe, America, China, and Asia.

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Editorial Contact:

Tom Tillman, Director of Marketing
TDK-Lambda Americas Inc.
401 Mile of Cars Way, Suite 325
National City, CA 91950
Ph: 619-575-4400