sm145g0 NEC Tokin, sm145g0 Datasheet - Page 5

• Manufacturer Part Number: sm145g0
• Description: Fusible Alloy Thermal Sensitive Type Amperes Va.c. Amperes Vd.c. Rated Current
• Manufacturer: NEC Tokin

Cautions
This section describes cautions designed to protect the performance of the thermal cutoff, Be sure to read and
fully understand these cautions.
Design Cautions
To obtain full performance from the thermal cutoff, it is necessary for the customer to appropriately store
the thermal cutoff, design appropriate circuits for the application, and perform evaluations, mounting and
testing as necessary. Problems arising from the inappropriate execution of the above are the responsibility
of the customer, and NEC declines any and all responsibility.
Do not use this device for any purpose other than as a thermal cutoff.
The thermal cutoff is designed to detect abnormal rises in temperature and break circuits if needed. It is not
a current fuse that cuts excess current. If used as a current fuse, the SEFUSE may malfunction.
Do not use this device in aerospace equipment, aeronautical equipment, nuclear reactor control systems, Iife
support equipment or systems, transportation machinery engine control or safety-related equipment.
This device is designed for use in household electric appliance, office automation equipment, audio and video
equipment, computer and communications equipment, test and measurement equipment, personal electronic
equipment and transportation equipment (excluding engine control).
The customer should select the proper thermal cutoff device, mounting location, and mounting method as
appropriate for each application.
Verify whether the chosen selections are appropriate by repeatedly testing the final design for thermal cutoff
under normal conditions as well as under predicted maximum abnormal conditions.
Make designs so that the temperature of the body of the thermal cutoff does not exceed the temperatures
shown in Table 1.
If, these temperatures are exceeded on a regular basis, the thermal cutoff may start operating only at tem-
peratures lower than the normal operating temperature. Malfunctions may also occur. Even if the thermal
cutoff's operating temperature is exceeded, it may malfunction.
1) : The temperature does not means ambient temperature but surface temperature on
2) : When a large current flows through a thermal cutoff, temperature difference occurs
Table 1. Recommended maximum body temperature on a reqular basis
thermal cutoff.
between the case and the lead. Therefore, it is recommended to measure some points
on the thermal cutoff, and make design so that the highest temperature does not exceed
the temperature shown in Table 1.
Part Number
SM095G
SM110G
SM126G
SM130G
SM134G
SM145G
to 1 A
106˚C
110˚C
114˚C
125˚C
75˚C
90˚C
to 2 A
106˚C
110˚C
114˚C
125˚C
70˚C
85˚C
Pass-through Current
to 3 A
100˚C
105˚C
110˚C
120˚C
65˚C
85˚C
to 4 A
100˚C
105˚C
120˚C
80˚C
95˚C
—
to 5 A
100˚C
115˚C
75˚C
90˚C
95˚C
—
SM/G SERIES
5