Product News: Electronic Components & Devices

Wirewound Resistors offer power ratings up to 12 W.

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Press Release Summary:

April 21, 2014 - Featuring non-inductive Ayrton-Perry winding and non-magnetic, all-welded construction, MRA Series offers high temperature operation to +350°C, which is suited for high-end audio and medical imaging equipment. Axial lead devices provide resistance from 0.01 Ω to 85.0 kΩ, with tolerances of ±1%, ±5%, and ±10%. In addition, resistors feature TCR of ±90 ppm/°C for resistance below 0.99 Ω, ±50 ppm/°C for resistance from 1.0–9.9 Ω, and ±30 ppm/°C for resistance of 10 Ω and above.

Original Press Release

Vishay Intertechnology Releases New Series of Non-Magnetic, Non-Inductive Axial Lead Wirewound Resistors

Press release date: April 17, 2014

Ideal for Audio and Medical Applications, Devices Feature High Power Ratings to 12 W and Operating Temperature to +350 °C

MALVERN, Pa. — Vishay Intertechnology, Inc. (NYSE: VSH) today introduced a new series of non-magnetic, non-inductive axial lead wirewound resistors with high power ratings to 12 W and high-temperature operation to +350 °C, which is ideal for high-end audio and medical imaging equipment.

For radio frequency (RF) and operational amplifier applications, the non-magnetic and all-welded construction of the Vishay Mills MRA series devices, from the Vishay Dale Resistors division, greatly enhances frequency response. Combined with a non-inductive Ayrton-Perry winding, inductive reactance and signal loss are virtually eliminated.

The resistors provide power ratings from 4 W to 12 W at 25 °C and temperature ranges from -65 °C to +250 °C (characteristic U) and -65 °C to +350 °C (characteristic V). The devices offer resistance from 0.01 Ω to 85.0 kΩ, with tolerances of ± 1 %, ± 5 %, and ± 10 %, and TCR of ± 90 ppm/°C for resistance below 0.99 Ω, ± 50 ppm/°C for resistance from 1.0 Ω to 9.9 Ω, and ± 30 ppm/°C for resistance of 10 Ω and above.

MRA resistors are RoHS-compliant and comply with Vishay Green standards.

Device Specification Table:

Model Power Rating P25° C (W) Resistance Range (Ω)
Characteristic U +250 °C Characteristic V +350 °C
MRA-05 4.0 5.0 0.01 to 15.0 k
MRA-10 7.0 10.0 0.05 to 35.0 k
MRA-12 10.0 12.0 0.05 to 85.0 k

Samples and production quantities of the MRA series are available now, with a lead time of six to eight weeks for larger orders. Pricing for U.S. delivery only starts at $1.40 per piece in 1,000-piece quantities.

#Vishay Intertechnology, Inc., a Fortune 1000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers of discrete semiconductors (diodes, MOSFETs, and infrared optoelectronics) and passive electronic components (resistors, inductors, and capacitors). These components are used in virtually all types of electronic devices and equipment, in the industrial, computing, automotive, consumer, telecommunications, military, aerospace, power supplies, and medical markets. Vishay's product innovations, successful acquisition strategy, and "one-stop shop" service have made it a global industry leader. Vishay can be found on the Internet at

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