Brochure

Frequently Asked Questions
www.vishay.com
Vishay
Revision: 16-Apr-15
2
Document Number: 29111
For technical questions, contact: [e-mail]
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
I WANT TO OBTAIN A SPREADSHEET OF THE RESISTANCE TEMPERATURE DEPENDENCY OF MY
VISHAY NTC THERMISTOR REFERENCE.
• Just go to “My VISHAY NTC curve” (www.vishay.com/resistors-non-linear/ntc-curve-list/), download the file, open the file
following the instructions, indicate your P/N, temperature range and step and all R/T data of the requested part will be
showed.
I NEED TO MATCH A THERMISTOR CURVE DEFINED BY A R
25
OR R AT ANOTHER TEMPERATURE
AND A B-VALUE, BUT THE B-VALUES I HAVE ARE DEFINED BETWEEN TEMPERATURES OTHER
THAN 25 °C AND 85 °C. HOW CAN I GET THE CORRELATION WITH THE VISHAY SPECIFIED B
25/85
?
• Some suppliers have B-values specified between other temperatures. The correlation between these B-values and Vishay
values depends on the form of the curve and can change from one type of product to another. Please contact your Vishay
representative or submit your question online here: [e-mail]
.
• We propose as well a program for design-in of NTC thermistors which can guide you to the right product selection. You can
look to a video presentation of how this software operates:
www.vishay.com/videos/resistors/edesign-demonstration-for-ntc-thermistors.
This software now on a flash drive can be obtained by emailing to [e-mail].
DOES VISHAY HAVE COMPONENTS WITH A TEMPERATURE RANGE UP TO 900 °C?
• Yes, the reference NTCV101E4964HMB0 (high temp. glass encapsulated component) is specified up to 900 °C).
(www.vishay.com/doc?29150)
ARE VISHAY THERMISTORS RoHS COMPLIANT?
• Yes, RoHS compliance is indicated and by the codes e2, e3 and e4 in the clear code SAP part numbers. (On old 12NC type
numbers the first 4 digits “2381” indicate RoHS compliance as well.)
HOW CAN I TELL WHAT TYPE OF TERMINATION FINISH THE DEVICE HAS BY LOOKING AT THE
PART NUMBER?
• In the ordering part number, e2 means Sn alloys; e3 means pure tin (Sn); and e4 means noble metal is used as the termination
finish. You can find the general Vishay Material Category Definitions and Policy here: www.vishay.com/doc?99902.
WHAT DO I DO IF I NEED A COMPONENT WITH MAXIMUM PRECISION AT SOME TEMPERATURE
VALUE OTHER THAN THE 25 °C INDICATED IN THE PRODUCT DATASHEET?
• Consult the R/T computation programs: A central reference temperature other than 25 °C can be chosen along with a
tolerance at www.vishay.com/resistors-non-linear/curve-computation-list/.
WHAT IF I WANT MY TEMPERATURE DATA EXPRESSED IN DEGREES FAHRENHEIT INSTEAD OF
CELSIUS?
• Look in the R/T computation programs: Download the files where R/T tables are expressed in °F at
www.vishay.com/resistors-non-linear/curve-computation-list/
or visit “My Vishay NTC curve” at
www.vishay.com/resistors-non-linear/ntc-curve-list/
IN MY APPLICATION, THE COMPONENTS ARE POTTED INTO THERMO-CONDUCTIVE EPOXY.
WHICH COMPONENTS ARE BEST COMPATIBLE WITH THIS PROCESS?
• Select the NTCLE203….SB0, NTCLE201, NTCLE300 or NTCLE301 series with a flexible top-coating.
I NEED A SENSOR FOR SURFACE TEMPERATURE MEASUREMENT. WHERE CAN I FIND THIS?
• Select the ring tongue sensors or LUG type NTC A LUG… series on the Vishay NTC thermistor selector pages at
www.vishay.com/resistors-non-linear/ntc/.
• Vishay has one of the smallest and most accurate and fast NTC-lug sensors on the market:
You can verify its performance in the mini-Lug demo video:
www.vishay.com/videos/resistors/vishay8217-s-ntc-mini-lug-sensor-features-fast-response-time-and-accurate-temperature-sensing .