Posistor
®
for over current protection PRG SERIES
BC-E0335
PRG21BC***MM1RK SERIES
1.Part Numbering
ex)
PR
G
Product ID Series
21
Dimensions
BC
Temperature
Characteristics
0R4
Resistance
M
Resistance
Tolerance
M1
Individual
Specifications
RK C
Packaging
2. Ratings (*4)
Part Number
Resistance
(at 25°C)
0.4ohm
±20%
0.6ohm
±20%
0.8ohm
±20%
1.0ohm
±20%
1.5ohm
±20%
2.2ohm
±20%
3.3ohm
±20%
4.7ohm
±20%
6.8ohm
±20%
Max.
Voltage
DC12V
*1
Max.
Current
38A
330mA (at +60°C)
420mA (at +25°C)
DC13.2V
28A
285mA (at +60°C)
340mA (at +25°C)
DC14V
22A
230mA (at +60°C)
330mA (at +25°C)
DC16V
20A
220mA (at +60°C)
250mA (at +25°C)
DC18V
15A
170mA (at +60°C)
220mA (at +25°C)
DC27V
16A
150mA (at +60°C)
180mA (at +25°C)
DC30V
12A
120mA (at +60°C)
155mA (at +25°C)
DC32V
8.5A
100mA (at +60°C)
120mA (at +25°C)
DC32V
6.0A
80mA (at +60°C)
260mA (at +25°C)
330mA (at +25°C)
320mA (at -10°C)
400mA (at +25°C)
400mA (at -10°C)
500mA (at +25°C)
480mA (at -10°C)
560mA (at +25°C)
600mA (at -10°C)
740mA (at +25°C)
700mA (at -10°C)
760mA (at +25°C)
850mA (at -10°C)
920mA (at +25°C)
940mA (at -10°C)
1080mA (at +25°C)
1100mA (at -10°C)
*2
Hold Current
480mA (at +25°C)
*3
Trip Current
1350mA (at -10°C)
PRG21BC0R4MM1RK
PRG21BC0R6MM1RK
PRG21BC0R8MM1RK
PRG21BC1R0MM1RK
PRG21BC1R5MM1RK
PRG21BC2R2MM1RK
PRG21BC3R3MM1RK
PRG21BC4R7MM1RK
PRG21BC6R8MM1RK
Packaging Tape : Taping (Standard quantity is 3000pcs. Per reel)
*1
*2
*3
*4
Shows the Maximum Current value which Shall be passed repeatedly when the circuit runs abnormally.
Shows the Maximum Current value which Shall be passed continuously without tripping at 25°C and 60°C
Shows the Trip Current value when Posistor
®
shall protect circuit from over load at 25°C and -10°C
This rated value is a value when the thermal dissipation coefficient of a mounting state is 10mW/°C.
In other condition of 10mW/°C, rated values may be different.
This information may be changed without a previous notice.
Murata Manufacturing Co., Ltd.
3. Dimensions (mm)
L1
W
(1) Electrode
（Sn
Plating）
(2) BaTiO
3
Semiconductive Ceramic
①
L2
L4
L3
②
W
H
H
L1
2.00±0.20
W
1.25±0.20
H
1.25±0.20
L2 and L3
Min. 0.2
L4
Min. 0.5
4. Quantity (Standard Quantity)
Products quantity in a reel
3,000 pcs. /reel
This information may be changed without a previous notice.
Murata Manufacturing Co., Ltd.
Resistance-Temperature Characteristics
Typical Curve
1000
100
Resistance Change（R/R25）
10
1
0.1
-20
0
20
40
60
80
100
120
140
160
180
200
Temperature (℃)
BC-038'
This information may be changed without a previous notice.
Notice for use
Caution
1. This product is designed for application, which is used under ordinary environment. (room temperature,
normal humidity, normal pressure) Do not expose this to the following environments, because all these
factors can deteriorate the characteristic of this and can cause failure or burn out.
(1) Corrosive gas or deoxidizing gases (Cl
2
, H
2
S, NH
3
, SOx, NOx etc.)
(2) Volatile, flammable gas
(3) Dusty place
(4) Place in a vacuum, reducing or putting pressure
(5) Place in splashed water, or high humidity and dewing place
(6) Salt water, oil, chemical liquid and solvent
(7) Vibratile place
(8) Other place equivalent to the above
2. Limitation of Applications
Please contact us before using our products for the under-mentioned applications requiring especially
high reliability in order to prevent defects which might directly cause damage to other party’s life body or
property (listed below).
(1) Aircraft equipment (2) Aerospace equipment (3) Undersea equipment
(4) Power plant control equipment (5) Medical equipment
(6) Transportation equipment (automobiles, trains, ships, etc.) (7) Traffic signal equipment
(8) Disaster prevention / Crime prevention equipment (9) Data-processing equipment
(10) Applications of similar complexity or with reliability requirements comparable to the
applications listed in the above
3. Be sure to provide an appropriate fail-safe function on your product to prevent a second damage that
may be caused by the abnormal function or the failure of our product.
Notice
1. Do not apply abnormal voltage/current exceeding the specified maximum value. Because they may
deteriorate or destroy PTC element.
2. Use this product within the specified temperature. A higher temperature may deteriorate the
characteristic or material.
3. The body of this product is not insulated. Please keep an adequate distance to surrounding components
and wiring.
4. Storage conditions
To keep solderability from declining, following storage condition is recommended.
(1) Condition Temperature : -10 to +40°C
Humidity
: Less than 75%RH (not dewing condition)
(2) Term: Please use this POSISTOR within 6 months after shipment by first-in and first-out stocking
system.
(3) Handling after seal open: After unpacking of the minimum package, reseal it promptly or store it
inside a sealed container with a drying agent.
(4) Place: Do not store this product in corrosive gas (SOx, Cl etc) or under sunlight.
Murata Manufacturing Co., Ltd.
This information may be changed without a previous notice.
CE-025Q
5. Solder and Flux
(1) Solder Paste
Use solder paste with Sn:Pb=60:40wt% , Sn:Pb=63:37wt%
,Sn:Ag:Cu=96.5:3.0:0.5wt%
Use of the solder containing Zn may reduce adhesive strength. When you use the solder containing
Zn, please contact us in advance.
For your reference, we are using
‘63Sn/37Pb RMA9086 90-3-M18’, manufactured by Alpha Metals Japan Ltd.,
’96.5Sn/3.0Ag/0.5Cu M705-GRN360-K2-V’, manufactured by Senju Metal Industry Co., LTD
for any Internal tests of this product.
(2) Flux
Use rosin type flux in soldering process.
If below flux is used, some problems might be caused in the product characteristics and reliability.
Please do not use below flux.
• Strong acidic flux (with halide content exceeding 0.2wt%).
• Water-soluble flux(*Water-soluble flux can be defined as non rosin type flux including wash-type flux
and non-wash-type flux.)
6. For removing the flux after soldering, observe the following points in order to avoid deterioration of the
characteristics or any change of the external electrodes quality.
(1) Cleaning Conditions
Solvent
Dipping Cleaning
Ultrasonic Cleaning
Less than 5 min.
Less than 1 min.
at room temp.
20W/L max.
2-propanol
or
Frequency of several 10 kHz
Less than 2 min.
to 100 kHz.
at 40°C max.
*A sufficient cleaning shall be applied to remove flux
*2-propanol
is recommended as cleaning solvent. Please contact us in case you use other
cleaning solvent.
*Do not use “Pine alpha SR100S”&“Clean through 750L” for removing the flux after
soldering. Because
they may deteriorate PTC element.
(2) Drying : After cleaning, dry promptly this product.
7. In your mounting process, observe the following points in order to avoid deterioration of the
characteristics or destruction of this product. The mounting quality of this product may also be affected by
the mounting conditions, shown the points below.
This product is for only reflow soldering. Flow soldering shall not be allowed.
Please mount this product by soldering. When mounted by other methods, such as conductive adhesives,
please contact us in advance.
(1) Standard Land Size
Too big land size gives too much solder paste on the land. It may cause destruction of this product,
because of the mechanical stress especially in the case of board bending.
b
a
b
c
a
c
1.0~1.2
0.5~0.7
1.0~1.2
(mm)
(2) Printing Conditions of Solder Paste
i. Standard thickness of solder paste printing shall be from 0.15 to 0.20 mm.
ii. After soldering, the solder fillet shall be a height from 0.2 mm to the thickness of this product.
(See the figures below.)
iii. Too much solder gives too strong mechanical stress to this product, such stress may cause
cracking or any mechanical damage. And also, it can destroy the electrical performance of this
product.
Murata Manufacturing Co., Ltd.
CE-025Q
This information may be changed without a previous notice.
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