NVE Sensor and Isolator News
May 2010
In This Issue

Ultraminiature Sensors

Sensor + Test 2010


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Recent Accolades
The ADL-Series ULLGA sensor (see product overview at right) was named the April Product of the Month by the German trade magazine Konstruktion & Engineering.

For the first time, NVE was ranked in the Star Tribune annual list of the largest Minnesota-based publicly-traded companies.
Constant Contact named NVE an e-mail Marketing All Star, citing engaging content and high readership rates.

<Links to Accolades>

In the News
The new IL41050 Isolated CAN Transceiver was covered in Electronic Specifier and Elektronik Informationen. The IL41050 reduces chip count and improves performance compared to discrete transceivers and optocouplers.
<Links to Isolator News>

Transition Metals
What did the cowboy do with his horse?

What did the gambler do with his cards?

Voicemail Playlist
Currently playing on our phone system background music is the theme from “Chips,” the ’70s TV show.

NVE is a leader in sensor and isolator chips.

Memorial Day
Memorial Day
NVE will be closed for business Monday, May 31 in observance of Memorial Day.
Featured Product
Ultraminiature Magnetic Sensors
ADL-Series Sensors fit on the head of a pin
ADL-Series Sensors fit
on the head of a pin.
Smaller than the head of a pin, the award-winning 1.1 mm x 1.1 mm x 0.45 mm ADL-Series GMR Digital Switches are NVE’s smallest packaged parts

Ideal for ultraminiature industrial controls, outputs are configured as magnetic “switches,” where the output turns on when a magnetic field is applied and off when the field is removed.

The devices are omnipolar, meaning the field can be either polarity, and the magnetic operate point is extremely stable over supply voltage and temperature.

Continuously-operating versions consume about 200 microwatts.

Internally duty cycled versions consume less than a microwatt; ideal for battery-powered devices such as meters and portable instruments.

ADL0xx-14 Functional Block Diagram
ADLxxx-14 Functional Block Diagram

Key ADL-Series specifications are:
  •  1.1 mm x 1.1 mm x 0.45 mm ULLGA package
  •  2.4 - 3.6 V supply voltage
  •  As low as 72 nW typ. power consumption at 2.4 V
  •  20, 28, or 40 Oersted operate points
  •  Current-sinking output up to 100 µA
  •  -40°C to +125°C temperature range

Because of the large number of permutations, not all part numbers are available off the shelf, so call our Sensor department at (800) GMR-7141 or e-mail sensor-info@nve.com for information or samples. You can see them (bring your magnifier) at Sensor+Test 2010 (below).

<Data Sheet for NVE’s Smallest Packaged Sensors (.pdf)>
Sensor+Test 2010

Sensor/Test LogoNVE sensors will be on display at Sensor+Test 2010 in cooperation with NVE distributor HY-LINE Sensor-Tech. The show runs May 18 to May 20 in Nüremberg, Germany, and is one of the largest sensor shows in the world.

<Free Registration Courtesy of HY-LINE>

Application Corner
Remembering Magnets
By “Magnetic” Jay Brown
Vice President, Sensors

Sometimes forgotten in sensor systems are the humble magnets. But the right magnet can make a big difference in sensor system performance, often without much cost impact. NVE stocks several popular magnet types.

Magnet Configurations
Magnets can be often used to activate a magnetic sensor, as with a simple proximity sensor, or to bias a sensor where the field is deflected in proximity to ferromagnetic material. For example, GMR Switch Sensors are often activated with a magnet and GT Gear-Tooth Sensors are usually operated with a bias magnet.

Material Grades
Ceramic and Alnico magnetic materials are graded between one and eight. Grade 1 materials are non-oriented or isotropic. In general, higher grades are more fully oriented (anisotropic) and have higher field strengths. Magnet cost also tends to increase with material grade.

Ceramic (ferrite) magnets are made of strontium carbonate and iron oxide. Grade 1 have the weakest magnetic field strengths, grade 5 are inexpensive and popular with our customers, and grade 8 have good field characteristics for sensor systems and are still relatively inexpensive.

Alnico refers to aluminium-nickel-cobalt alloys. Alnico magnets have working temperatures above 1,000°F (538°C). Alnico grade 8 magnets provide a very stable field over wide temperature ranges, making them the preferred choice for high temperature application.

Rare-earth magnets (samarium-cobalt or neodymium-iron-boron) are relatively expensive and have very high field strengths. The high field strengths are generally not necessary in NVE sensor systems and may saturate sensor, resulting in no output.

Sizes and Shapes
There are almost infinite choices of magnet sizes and shapes. Some of the more common among our customers are bar magnets around 1/2 inch long and disk magnets from 1/8 to 1/4 inch in diameter.

Specialty Magnets
Split-pole magnet
Split-pole magnet
Split-pole disk magnets are typically used for angle sensors such as AAT001 Angle Sensors, although a bar magnet can also be used. Split-pole magnets have poles on opposite sides of the diameter rather than top and bottom as with a conventional disk magnet (see figure at right).

Ring magnets have multiple poles around the diameter and can be used for rotational or course-angle sensing. Ring magnets are common in ABS systems, for example, and can be used with GT Sensors.

<Magnet Data Sheet (.pdf)>
Buy Magnets Online