industry news
Subscribe Now

Metal film resistors from TT Electronics are ideal for harsh environments

Woking, UK, 10 April 2017 – TT Electronics, a global provider of engineered electronics for performance critical applications, today launched the WRM-HP range of precision metal film MELF resistors with AEC-Q200 qualification.  Providing a combination of high precision and tolerance to surge conditions, the resistors are ideal for measuring supply line voltage levels in energy metering and power condition monitoring. 

The resistors complement TT Electronics’ existing WRM series, adding high power versions of the larger two sizes.  Their AEC-Q200 qualification makes them an ideal choice for reliable performance in harsh environment applications such as those found in automotive products. Aimed at industrial, instrumentation and automotive applications, the resistors will find favour with designers of energy meters, measurement instruments, process monitors and automotive control systems.

The WRM0204HP and WRM0207HP are rated at 0.4 and 1W respectively. The former specifies a maximum 5 second overload voltage of 400V and the latter, 700V. Standard values from R10 to 1M0 are available in E24 and E96 ranges, giving plenty of scope for ‘close value match’ choice to designers.  A wide ambient temperature range of -55 to 155 degrees C is accommodated.

The resistors’ excellent surge tolerance characteristics enhance reliability and reduce field failures.  With precision levels of +/-0.1% resistance tolerance and +/-15ppm/degrees C TCR they free up designers’ error budgets, enabling savings elsewhere in the circuit. 

Physically the resistors comprise a homogeneous sputtered metal alloy film on a high-grade ceramic rod. The resistance is adjusted to final value by a helical laser cut in the film, and the resistor body is protected by a lacquer coating. The resistors’ end caps’ pure tin finish comprise ageing free contacts onto which low melting-point solders can be used. WRM0204HP resistors measure 3.7 length x 1.55 diameter, and the WRM0207HP, 6.1 x 2.4mm.  

Compared to key competing products, TT Electronics’ WRM-HP series offers the highest available rated power for a given load life stability and a higher 1.2/50microsecond lightning strike surge maximum voltage.

Driving the demand for this type of product is the growth in smart meters for billing and for site or process energy management, and also the demand for higher reliability automotive grade components.  TT Electronics’ WRM-HP range of precision metal film resistors provides a leading combination of precision, high power rating and tolerance to surges.

For further information visit http://www.ttelectronics.com/sites/default/files/resistors-datasheets/WRM-HP.pdf

About TT Electronics plc

TT Electronics is a global provider of engineered electronics for performance critical applications. It works with market-leading customers in the transportation, industrial, medical, and aerospace and defence sectors.

With headquarters in Woking, UK, TT Electronics employs approximately 6000 staff and operates from 27 locations around the world. It has four divisions: Transportation Sensing and Control, Industrial Sensing and Control, Advanced Components, and Integrated Manufacturing Services.

For more information about TT Electronics visit http://www.ttelectronics.com.

Leave a Reply

featured blogs
Mar 28, 2024
'Move fast and break things,' a motto coined by Mark Zuckerberg, captures the ethos of Silicon Valley where creative disruption remakes the world through the invention of new technologies. From social media to autonomous cars, to generative AI, the disruptions have reverberat...
Mar 26, 2024
Learn how GPU acceleration impacts digital chip design implementation, expanding beyond chip simulation to fulfill compute demands of the RTL-to-GDSII process.The post Can GPUs Accelerate Digital Design Implementation? appeared first on Chip Design....
Mar 21, 2024
The awesome thing about these machines is that you are limited only by your imagination, and I've got a GREAT imagination....

featured video

We are Altera. We are for the innovators.

Sponsored by Intel

Today we embark on an exciting journey as we transition to Altera, an Intel Company. In a world of endless opportunities and challenges, we are here to provide the flexibility needed by our ecosystem of customers and partners to pioneer and accelerate innovation. As we leap into the future, we are committed to providing easy-to-design and deploy leadership programmable solutions to innovators to unlock extraordinary possibilities for everyone on the planet.

To learn more about Altera visit: http://intel.com/altera

featured chalk talk

ROHM Automotive Intelligent Power Device (IPD)
Modern automotive applications require a variety of circuit protections and functions to safeguard against short circuit conditions. In this episode of Chalk Talk, Amelia Dalton and Nick Ikuta from ROHM Semiconductor investigate the details of ROHM’s Automotive Intelligent Power Device, the role that ??adjustable OCP circuit and adjustable OCP mask time plays in this solution, and the benefits that ROHM’s Automotive Intelligent Power Device can bring to your next design.
Feb 1, 2024
7,738 views