sheets, data books, other publications, on the EPCOS website, or in order-related documents
such as shipping notes, order confirmations and product labels. The varying representations of
the ordering codes are due to different processes employed and do not affect the
specifications of the respective products. Detailed information can be found on the Internet
under www.epcos.com/orderingcodes
Temperature measurement and compensation B57820M
Leadless NTCs M820
Page 16 of 20Please read Cautions and warnings and
Important notes at the end of this document.
Symbols and terms
Symbol English German
A Area Fläche
AWG American Wire Gauge Amerikanische Norm für Drahtquerschnitte
B B value B-Wert
B
25/100
B value determined by resistance
measurement at 25 °C and 100 °C
B-Wert, ermittelt durch Widerstands-
messungen bei 25 °C und 100 °C
C
th
Heat capacitance Wärmekapazität
I Current Strom
N Number (integer) Anzahl (ganzzahliger Wert)
P
25
Maximum power at 25 °C Maximale Leistung bei 25 °C
P
diss
Power dissipation Verlustleistung
P
el
Electrical power Elektrische Leistung
P
max
Maximum power within stated
temperature range
Maximale Leistung im
angegebenenTemperaturbereich
R
B
/R
B
Resistance tolerance caused by
spread of B value
Widerstandstoleranz, die durch die
Streuung des B-Wertes verursacht wird
R
ins
Insulation resistance Isolationswiderstand
R
P
Parallel resistance Parallelwiderstand
R
R
Rated resistance Nennwiderstand
R
R
/R
R
Resistance tolerance Widerstandstoleranz
R
S
Series resistance Serienwiderstand
R
T
Resistance at temperature T
(e.g. R
25
= resistance at 25 °C)
Widerstand bei Temperatur T
(z.B. R
25
= Widerstand bei 25 °C)
T Temperature Temperatur
T Temperature tolerance Temperaturtoleranz
t Time Zeit
T
A
Ambient temperature Umgebungstemperatur
T
max
Upper category temperature Obere Grenztemperatur
(Kategorietemperatur)
T
min
Lower category temperature Untere Grenztemperatur
(Kategorietemperatur)
T
op
Operating temperature Betriebstemperatur
T
R
Rated temperature Nenntemperatur
T
surf
Surface temperature Oberflächentemperatur
V Voltage Spannung
V
ins
Insulation test voltage Isolationsprüfspannung
V
op
Operating voltage Betriebsspannung
V
test
Test voltage Prüfspannung
Temperature measurement and compensation B57820M
Leadless NTCs M820
Page 17 of 20Please read Cautions and warnings and
Important notes at the end of this document.
Symbol English German
α Temperature coefficient Temperaturkoeffizient
Tolerance, change Toleranz, Änderung
δ
th
Dissipation factor Wärmeleitwert
τ
c
Thermal cooling time constant Thermische Abkühlzeitkonstante
τ
a
Thermal time constant Thermische Zeitkonstante
Abbreviations / Notes
Symbol English German
Surface-mounted devices Oberflächenmontierbares Bauelement
* To be replaced by a number in ordering
codes, type designations etc.
Platzhalter für Zahl im Bestellnummern-
code oder für die Typenbezeichnung.
+ To be replaced by a letter. Platzhalter für einen Buchstaben.
All dimensions are given in mm. Alle Maße sind in mm angegeben.
The commas used in numerical values
denote decimal points.
Verwendete Kommas in Zahlenwerten
bezeichnen Dezimalpunkte.
Temperature measurement and compensation B57820M
Leadless NTCs M820
Page 18 of 20Please read Cautions and warnings and
Important notes at the end of this document.

B57820M0841A004

Mfr. #:
Manufacturer:
EPCOS / TDK
Description:
NTC Thermistors 77 Ohms 3550 1.5%
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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