ERT-J1VP473H Datasheet, PDF (10/14 Pages) Panasonic Semiconductor – NTC Thermistors

Multilayer NTC Thermistors
Multilayer Chip NTC Thermistors
Series: _ERTJ
Handling Precautions
Safety Precautions
Multilayer NTC Thermistors (hereafter referred to as “Thermistors”) should be used for general purpose applications
found in consumer electronics (audio/visual, home, office, information & communication) equipment.
When subjected to severe electrical, environmental, and/or mechanical stress beyond the specifications, as noted
in the Ratings and Specified Conditions section, the Thermistor may fail in a short circuit mode or in an open-circuit
mode. This case results in a burn-out, smoke or flaming.
For products which require high safety levels, please carefully consider how a single malfunction can affect your
product. In order to ensure the safety in the case of a single malfunction, please design products with fail-safe,
such as setting up protecting circuits, etc.
● For the following applications and conditions, please contact us for additional not found in this document.
· When your application may have difficulty complying with the safety or handling precautions specified below.
· For any applications where a malfunction with this product may directly or indirectly cause hazardous conditions
which could result in death or injury;
1 Aircraft and Aerospace Equipment (artificial satellite, rocket, etc.)
2 Submarine Equipment (submarine repeating equipment, etc.)
3 Transportation Equipment (motor vehicles, airplanes, trains, ship, traffic signal controllers, etc.)
4 Power Generation Control Equipment (atomic power, hydroelectric power, thermal power plant control system, etc.)
5 Medical Equipment (life-support equipment, pacemakers, dialysis controllers, etc.)
6 Information Processing Equipment (large scale computer systems, etc.)
7 Electric Heating Appliances, Combustion devices (gas fan heaters, oil fan heaters, etc.)
8 Rotary Motion Equipment
9 Security Systems
J And any similar types of equipment
■ Operating Conditions and Circuit Design
1. Circuit Design
1.1 Operating Temperature and Storage Temperature
The specified “Operating Temperature Range”
found in the Specifications is the absolute maximum
and minimum temperature rating. Every Thermistor
shall be operated within the specified “Operating
Temperature Range”.
The Thermistors mounted on PCB shall be stored
without operating within the specified “Storage
Temperature Range” in the Specifications.
1.2 Operating Power
Thermistors shall not be operated in excess of the
“Maximum power dissipation”.
If the Thermistors are operated beyond the specified
Maximum power dissipation, it may cause burnout
and/or damage due to thermal run away.
For temperature detection applications, the accuracy
may be greatly influenced by self-heat generation
and the heat dissipation of the Thermistor, even
if the Thermistor is operated under the specified
Maximum Power Dissipation.
Please check the safety and reliability of your circuit.
[Maximum power dissipation]
·The Maximum power that can be continuously applied
under static air at a certain ambient temperature.
The Maximum power dissipation under an ambient
temperature of 25 °C or less is the same with the
rated maximum power dissipation, and Maximum
power dissipation beyond 25 °C depends on the
Decreased power dissipation curve below.
Decreased power dissipation curve
100
50
25
75
125
Ambient temperature (°C)
[Dissipation factor]
·The constant amount power required to raise the
temperature of the Thermistor 1 °C through self heat
generation under stable temperatures.
Dissipation factor (mW/°C) = Power consumption of
Thermistor / Temperature rise of element
00 Sep. 2010