Panasonic Circuit Protector Elements UNHZ203 User manual

This product complies with the RoHS Directive (EU 2002/95/EC).
Circuit Protector Elements
1
Publication date: November 2006 SQB00036BED
UNHZ203
Circuit Protector Elements
For overcurrent protection
■Features
•Sharp cutoff characteristics and low voltage drop
•Flame retardant package and low heat generation, high density
mounting is possible.
■Absolute Maximum Ratings Ta=25°C
Parameter Symbol Rating Unit
Operating ambient temperature Topr −55 to +125 °C
Storage temperature Tstg −55 to +125 °C
■Usage Notes
•Package shall be overheated and dangerous for overcurrent.
•This device should be used only to the secondary circuit.
Package will be damaged for added overpower.
•This device is not electrical fuse legally. Please draw a clear line between electrical fuse from this device.
Parameter Min Typ Max Unit
Rated voltage 50 V
Rated current 1.2 A
Internal Resistance 35 46 57 mΩ
Cutoff current *2.4 A
■Electrical Characteristics Ta=25°C ±3°C
Note) *: Measurement condition of cutoff current shall be at Ta=25°C, t =1 s
Tolerance of cutoff current shall be ±20%
Marking Symbol: H3
Unit: mm
SMini2-F1 Package
5˚
5˚
1.25
±0.1 0.7 ±0.1
2.5
±0.2
1.7
±0.1
0.4
±0.1
0 to 0.1
(0.15)
0.16
0.5
±0.1
1
2
+0.1
–0.06
0.35 ±0.1
0 to 0.1
2
1
Lead Connection

This product complies with the RoHS Directive (EU 2002/95/EC).
UNHZ203
2SQB00036BED
−25 150250 100 12550 75
0.6
1.1
1.0
0.9
0.8
0.7
Cutoff current ratio
Ambient temperature T
a
(°C)
Cutoff current ratio TaI2t t
Cutoff current characteristics
10 10
2
10
3
1
1
10
10
2
10
3
10
4
T
a
= 25°C
Cutoff line of real ability by pulse
Limit line of real ability by pulse
Recommendable limit line by pulse
t (ms)
I
2
t (A
2
•ms)
0642
10
−3
1
10
−1
10
−2
+20%−20%
T
a
= 25°C
Cutoff current (A)
Cutoff time t (s)

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semiconductors described in this book
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company. Therefore, no responsibility is assumed by our company as to the infringement upon any such right owned by any other
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equipment, communications equipment, measuring instruments and household appliances).
Consult our sales staff in advance for information on the following applications:
–Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support
systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the prod-
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–Any applications other than the standard applications intended.
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provement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product
Standards in advance to make sure that the latest specifications satisfy your requirements.
(5)When designing your equipment, comply with the range of absolute maximum rating and the guaranteed operating conditions
(operating power supply voltage and operating environment etc.). Especially, please be careful not to exceed the range of absolute
maximum rating on the transient state, such as power-on, power-off and mode-switching. Otherwise, we will not be liable for any
defect which may arise later in your equipment.
 Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure
mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire
or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products.
(6)Comply with the instructions for use in order to prevent breakdown and characteristics change due to external factors (ESD, EOS,
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