Radial Leaded PTC
0ZR
G
Series
belfuse.com/circuit
-
protection
0ZR
Series
RoHS 2 Compliant
Application
Low voltage USB equipment and Computers & peripherals
Product Features
-
Low resistance, Fast trip time, Low trip
-
to
-
hold ratio
-
AEC
-
Q
Compliant
-
Meets Bel automotive
qualification*
*
-
Largely based on internal AEC
-
Q test plan
Operating (Hold Current) Range
750mA
-
2.5A
Maximum Voltage
16V/30VDC
Temperature Range
-
40
℃
to 85
℃
Agency Approval
TUV (Std. EN60738
-
1
-
1, Cert. R50102187,
Rated Voltage: DC 16V
)
UL Recognized Component
(Std. UL1434, File E305051,
Rated Voltage: DC 30V
)
UL Conditions of Acceptability:
1. These devices have been investigated for use in safety circuits and are suitable as
a limiting device.
2. These devices have been calibrated to limit the current to
8 amps within 5
seconds, per ANSI/NFPA 70, “National Electrical Code”.
LEAD FREE =
HALOGEN FREE =
Electrical Characteristics (23
℃
)
Part Number
(Bulk)
Hold
Current
Trip
Current
Max Time to Trip
Max
Current
Rated
Voltage
*
Typical
Power
Resistance Tolerance
Agency Approvals
Current
Time
Rmin
R1max
I
H
, A
I
T
, A
A
Sec
I
max
, A
V
max
, V
dc
P
d
, W
Ohms
Ohms
A
0ZRG0075FF1E
0.75
1.30
8.0
0.4
40
16/30
0.3
0.08
0.23
Y
Y
B
0ZRG0090FF1E
0.90
1.80
8.0
1.2
40
16/30
0.6
0.07
0.18
Y
Y
C
0ZRG0110FF1E
1.10
2.20
8.0
2.3
40
16/30
0.7
0.05
0.14
Y
Y
D
0ZRG0120FF1E
1.20
2.00
8.0
0.7
40
16/30
0.6
0.04
0.14
Y
Y
E
0ZRG0135FF1E
1.35
2.70
8.0
4.5
40
16/30
0.8
0.04
0.12
Y
Y
F
0ZRG0155FF1E
1.55
2.70
7.8
2.2
40
16/30
0.7
0.03
0.12
Y
Y
G
0ZRG0160FF1E
1.60
3.20
8.0
9.0
40
16/30
0.9
0.03
0.
11
Y
Y
H
0ZRG0185FF1E
1.85
3.70
8.0
10.0
40
16/30
1.0
0.03
0.09
Y
Y
I
0ZRG0250FF1E
2.50
5.00
8.0
40.0
40
16/30
1.2
0.02
0.07
Y
Y
*
-
Rated voltage is 30V per UL 1434 and 16V per EN 60738
-
1
-
1
IH Hold Current
-
maximum current at which the device will not trip in still air at 23
℃
.
IT Trip current
-
minimum current at which the device will always trip in still air at 23
℃
.
Imax Maximum fault current device can withstand without damage at rated voltage (Vmax).
Vmax Maximum voltage device can withstand without damage at its rated current.
Pd Typical power dissipated by device when in tripped state in 23
℃
still
air environment.
Rmin Minimum device resistance at 23
℃
.
R1max Maximum device resistance at 23
℃
, 1 hour after initial device trip, or after being soldered to PCB in end application.
Spe
cifications subject to change without notice
AEC
-
Q
Compliant
Type 0ZR
G
Series
2
/
4
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302 USA
+1
201.432.0463
Bel.US.CS@belf.com
belfuse.com/circuit
-
protection
© 2019
Bel Fuse, Inc.
Rev. 0ZR
G
J
an
2019
PTC’s
–
Basic Theory of Operation / “Tripped” Resistance Explanation
Fundamentally, a Bel PTC consists of a block of polymeric material containing conductive filler and bonded
between two conductive, planar terminations.
At currents below the device IHOLD
rating, AND at temperatures below 100C, the PTC maintains a
resistance value below its R1 MAX rating.
As the device's temperature approaches 130C, either due to an increase in ambient temperature or a
current exceeding its I TRIP rating, volumetric
expansion of the filled polymer breaks apart the majority of
conductive pathways across the terminals created by chain contact of adjacent filler particles or device
resistance increases sharply by several orders of magnitude.
At the much higher “Tripped”
resistance, there is just enough leakage current to allow internal heating to
“hold” the device in its tripped state (around 125C) until power is interrupted. Once power is removed, the
PTC's core cools and contracts allowing conductive chains to reform a
nd return the device to its low
resistance state.
The catalog data for each device specifies a "Typical Power" value. This is the power required to exactly
match the heat lost by the tripped device to its ambient surroundings at 23C. By Ohm's Law, power c
an be
stated as: W = E^2/R. Thus the approximate resistance of a “Tripped” PTC can be determined by: R =
E^2/W, where "E" is the voltage appearing across the PTC (usually the supply's open circuit voltage), and
"W" is the Typical Power value for the partic
ular PTC.
Since the PPTC acts to maintain a constant internal temperature, its apparent resistance will change based
upon applied voltage and, to a lesser degree, ambient conditions. Consider the following example....
A PTC with a Typical Power of 1 watt
protecting a circuit using a 60V supply will demonstrate an apparent,
tripped resistance "R" of:
R = 60^2/1 = 3,600 ohms
This same tripped device when used to protect a 12V circuit would now present an apparent resistance of:
R = 12^2/1 = 144 ohms
Th
e value for Typical Power is "typical" because any physical factors that affect heat loss (such as ambient
temperature or air convection) will somewhat alter the level of power that the PTC needs to maintain its
internal temperature. In short, PTCs do not
exhibit a constant, quantifiable tripped resistance value.
Type Time
–
To
–
Trip at 23
℃
.
Spe
cifications subject to change without notice
Type 0ZR
G
Series
3
/
4
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302 USA
+1
201.432.0463
Bel.US.CS@belf.com
belfuse.com/circuit
-
protection
© 2019
Bel Fuse, Inc.
Rev. 0ZR
G
J
an
2019
Physical Specifications
Lead material:
Matte tin plated copper, size / diameter as shown in Drawings and Table under Product
Dimensions.
Soldering charactcristics
Solder ability per ANSI/J
-
STD 002,
Solder heat withstand per IEC 68
-
2
-
20.
Insula
ting coating
Flame retardant epoxy polymer, meets UL
-
94
-
V
-
0 requirements.
P
TC Marking
“bel” or “b”, , IH code and “RG”
.
Product Dimensions
All dimensions in mm.
Thermal Derating Curve
Cautionary Notes
1. Operation beyond the specified maximum ratings
or improper use may result in damage and
possible electrical arcing and/or flame.
2. These Polymer PTC (PPTC) devices are intended
for protection against occasional
overcurrent/overtemperature fault conditions and
may not be suitable for use in applications where
repeated and/or prolonged fault conditions are
anticipated.
3. Avoid contact of PTC device with chemical
solvent. Prolonged contact may adversely impact
the PTC performance.
4. These PTC devices may not be suitable for use in
circuits with a large inductance, as the PTC trip
can generate circuit voltage spikes above the PTC
rated voltage.
5. These devices are intended for use in DC voltage
application
s only. Use in AC voltage applications
should be first discussed with Bel Fuse
engineering.
6. Not recommended for use on potted or conformal
coated PCB’s. Restriction of free air flow could
affect electrical performance and/or result in
device failur
e. Consult Bel Fuse engineering.
Part Number
Fig.
A
B
C
D
E
F
Max
Max
Typical
Min
Max
Typical
0ZRG0075FF
2
6.9
11.4
5.1
7.6
3.0
0.8
0ZRG0090FF
1
7.4
12.2
5.1
7.6
3.0
0.8
0ZRG0110FF
1
7.4
14.2
5.1
7.6
3.0
0.8
0ZRG0120FF
2
6.9
11.7
5.1
7.6
3.0
0.8
0ZRG0135FF
1
8.9
13.5
5.1
7.6
3.0
0.8
0ZRG0155FF
2
6.9
11.7
5.1
7.6
3.0
0.8
0ZRG0160FF
1
8.9
15.2
5.1
7.6
3.0
0.8
0ZRG0185FF
1
10.2
15.7
5.1
7.6
3.0
0.8
0ZRG0250FF
1
11.4
18.3
5.1
7.6
3.0
0.8
Spe
cifications subject to change without notice
Type 0ZR
G
Series
4
/
4
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302 USA
+1
201.432.0463
Bel.US.CS@belf.com
belfuse.com/circuit
-
protection
© 2019
Bel Fuse, Inc.
Rev. 0ZR
G
J
an
2019
Environmental Specifications
Temperature cycling
JESD22 Method JA
-
104
Biased humidity
MIL
-
STD
-
202 Method 103
Operational life
MIL
-
STD
-
202 Method 108
Terminal
strength
AEC
-
Q200
-
004
Resistance to solvents
MIL
-
STD
-
202 Method 215
Mechanical shock
MIL
-
STD
-
202 Method 213
Vibration
MIL
-
STD
-
202 Method 204
Resistance to soldering heat
MIL
-
STD
-
202 Method 210
Thermal shock
MIL
-
STD
-
202 Method 107
Solderability
ANSI/J
-
STD
-
002
Solder
ing Parameters
Lead
-
free Wave Soldering Profile
Wave Solder Parameter
Average ramp
-
up rate
200
℃
/ second
Heating rate during preheat
typical 1
-
2
℃
/ second
Max 4
℃
/ second
Final preheat temperature
within 125
℃
of soldering
temperature
Peak temperature Tp
260
℃
Time within +0
℃
/
-
5
℃
of actual peak
temperature
0.75A
-
1.1A: 10 seconds;
1.2A: 5 seconds
；
1.35A
-
2.5A: 10 seconds;
Ramp
-
down rate
5
℃
/ second max.
Standard Packaging
P/N Explanation and Ordering Information
Part Number
Bulk
Reel/Tape
Pcs/Box
P/N Code
Pcs/Reel
P/N Code
0ZRG0075FF
-
0ZRG0250FF
3000
1E
3000
2E
Spe
cifications subject to change
without notice