NTC thermistors for
temperature measurement
Glass-encapsulated sensors
with insulation
Series/Type: B57561G1
Date: January 2018
© EPCOS AG 2018. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Applications
Temperature measurement
Features
Glass-encapsulated NTC thermistor,
heat-resistant and highly stable
Coating of glass body and leads for electrical
insulation
For temperature measurement up to
260 °C
Leads: dumet wires (copper-clad FeNi)
Options
Alternative dimensions available on request
Delivery mode
Bulk
Dimensional drawing
Dimensions in mm
Approx. weight 140 mg
General technical data
Climatic category (IEC 60068-1) 55/260/56
Max. power (at 25 °C) P
25
50 mW
Resistance tolerance R
R
/R
R
±2, ±3 %
Rated temperature T
R
25 °C
Dissipation factor (in air) δ
th
approx. 1.5 mW/K
Thermal cooling time constant (in air) τ
c
approx. 18 s
Heat capacity C
th
approx. 27 mJ/K
Insulation resistance
1)
(V = 100 V DC) R
ins
100 M
Test voltage
1)
(t = 1 s) V
test
500 V DC
1) Medium: NaCl-solution; Temperature: Room temperature
Temperature measurement B57561G1
Glass-encapsulated sensors with insulation G1561
Page 2 of 26Please read Cautions and warnings and
Important notes at the end of this document.
Electrical specification and ordering codes
R
25
No. of R/T
characteristic
B
25/85
K
B
0/100
K
B
25/100
K
Ordering code
+ = Resistance tolerance
G = ±2%
H = ±3%
2 k 8323 3405 3378 3420 ±1% B57561G1202+000
2.056 k 7007 3545 3516 3560 ±1% B57561G1212+000
5 k 8328 3483 3456 3497 ±1% B57561G1502+000
10 k 8307 3478 3450 3492 ±1% B57561G1103+000
10 k 7003 3612 3586 3625 ±1% B57561G1103+005
20 k 8334 3991 3965 4006 ±1% B57561G1203+000
50 k 8346 3991 3965 4006 ±1% B57561G1503+000
100 k 8304 4072 4036 4092 ±1% B57561G1104+000
230 k 8352 4257 4216 4280 ±1% B57561G1234+000
Note
For ordering code B57561G1202+000 and B57561G1212+000 the R/T curve is defined for short
wire length (5 mm). In dependence of the real wire length of the glass-encapsulated sensor the
wire resistance can be considered for temperatures higher than 100 °C additionally with following
equation:
Temperature measurement B57561G1
Glass-encapsulated sensors with insulation G1561
Page 3 of 26Please read Cautions and warnings and
Important notes at the end of this document.

B57561G1103G005

Mfr. #:
Manufacturer:
EPCOS / TDK
Description:
NTC Thermistors NTC Thermistor G1561 /10k /G 5
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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