NR Series Datasheet by Bourns Inc.

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NR Series Breaker (Thermal Cutoff Device)
* RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
** Bourns considers a product to be “halogen free” if (a) the Bromine (Br) content is 900 ppm or less; (b) the Chlorine (Cl) content is 900 ppm or less; and (c) the total Bromine (Br)
and Chlorine (Cl) content is 1500 ppm or less.
Specifications are subject to change without notice. Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Features
n Formerly a product
n Miniature Thermal Cutoff (TCO) device
n Smallest body size, two current types
n Overtemperature and overcurrent protection
for lithium polymer and prismatic cells
n Controls abnormal, excessive current
virtually instantaneously
n Wide range of temperature options
Applications
Battery cell protection for:
n Notebook PCs
n Tablet PCs
n Smart phones
n Mobile phones
Ratings
Specification A-TYPE
NR72AB0 NR77AB0 NR82AB0 NR85AB0
Trip Temperature 72 °C ± 5 °C 77 °C ± 5 °C 82 °C ± 5 °C 85 °C ± 5 °C
Reset Temperature 40 °C min.
Contact Rating DC12V / 25 A, 6000 cycles
Maximum Breaking Current DC5V / 60 A, 100 cycles
Maximum Voltage DC28V / 25 A, 100 cycles
Minimum Holding Voltage 2 V @ 25 °C for 1 minute
Maximum Leakage Current 200 mA max. @ 25 °C
Resistance 5 milliohms max.
Agency Recognition
Product Dimensions
Description
UL, cUL File Number: E215638
TUV File Number: R50281578
Product Structure
4.8 ± 0.1
(.189 ± .004) 3.2 ± 0.1
(.126 ± .004)
3.2 ± 0.1
(.126 ± .004)
2.0 ± 0.1
(.079 ± .004)
2.0 ± 0.1
(.079 ± .004)
2.8 ± 0.1
(.110 ± .004)
0.89 ± 0.05
(.035 ± .002)
0.1 ± 0.01
(.004 ± .0004)
DIMENSIONS: MM
(INCHES)
How to Order
NR 77 A B 0
Series Designator
Trip Temperature (±5 °C)
• 72 • 82
• 77 • 85
Arm Material
A = Cu Alloy High Current Type
C = Cu Alloy Low Current Type
Terminal Type
1 = With Projection
B = No Projection
Manufacturer’s Internal Code
ARM TERMINAL
COVER PLATE
CONTACT
COVER ARM
BASE TERMINAL
BASE
AVAILABLE WITH AND WITHOUT PROJECTIONS.
PROJECTION
BIMETAL DISC
PTC PROJECTION
Specification C-TYPE
NR72CB0 NR77CB0 NR82CB0 NR85CB0
Trip Temperature 72 °C ± 5 °C 77 °C ± 5 °C 82 °C ± 5 °C 85 °C ± 5 °C
Reset Temperature 40 °C min.
Contact Rating DC12V / 12 A, 6000 cycles
Maximum Breaking Current DC5V / 30 A, 100 cycles
Maximum Voltage DC28V / 12 A, 100 cycles
Minimum Holding Voltage 2 V @ 25 °C for 1 minute
Maximum Leakage Current 150 mA max. @ 25 °C
Resistance 15 milliohms max.
Mini-breaker TCOs reset when the following conditions are met:
The ambient temperature has dropped by 10 °C below the minimum trip temperature
Power to the TCO has been cycled (off/on)
1155C
NR72AB0
5 6
1215C
NR77CB0
6 7
*RoHS COMPLIANT
LEAD FREE
*RoHS COMPLIANT
&
**HALOGEN FREE
LEAD FREE
VERSIONS ARE
RoHS COMPLIANT*
BOURNS Emvzmlhl EXCESS‘VE CURRENT AND/DR HEAT www bums cam/aocs/‘ega‘/d\sc\z\mev gm
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
NR Series Breaker (Thermal Cutoff Device)
Typical Performance
Operation
Temperature (°C)
Current (A)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
20 30 40 50 60 70 80
NR72AB0(Low 67 °C average)
NR77AB0(Low 72 °C average)
NR82AB0(Low 77 °C average)
NR85AB0(Low 80 °C average)
The above curves were derived from placing test samples in an oven at 25 ℃, 40 ℃, 60 ℃ and 70℃, increasing current flow through the
sample at a rate of 0.1 A/minute and recording the current value when the sample trips.
Current vs. Temperature Curves
A-Type
NORMAL CIRCUIT
CIRCUIT
AFTER OPENING
CURRENT
EXCESSIVE
CURRENT
AND/OR
HEAT
VERY LOW CURRENT
Ambient Temperature (°C)
Current (A)
9
10
20 30 40 50 7060 80
8
7
6
5
4
3
2
1
0
NR72CB0(Low 67 °C average)
NR77CB0(Low 72 °C average)
NR82CB0(Low 77 °C average)
NR85CB0(Low 80 °C average)
Current vs. Temperature Curves
C-Type
BOURNS um CODE A 1253A K NR77AEO BOURNS ‘ www bums cam/docsflega‘lmsc‘zwmav um
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Asia-Pacific: Tel: +886-2 2562-4117 • Email: asiacus@bourns.com
EMEA: Tel: +36 88 520 390 • Email: eurocus@bourns.com
The Americas: Tel: +1-951 781-5500 • Email: americus@bourns.com
www.bourns.com
NR Series Breaker (Thermal Cutoff Device)
Typical Part Marking
Wiring Recommendations
This is not a surface mount device for reflow soldering. Therefore, Ni tab wiring should be accomplished by either resistance or laser welding.
Solder connections should be avoided.
Standard Packaging Specifications
Plastic Bag.......................................................................................................................................................................1,000 pcs. (fixed)
Inner Box .........................................................................................................................................................................5,000 pcs. (fixed)
Outer Box ....................................................................................................................................50,000 pcs. max. (up to 10 inner boxes)
1253A
**
NR77AB0
DATE CODE:
MONTH (1~9, X, Y, Z)
DATE
YEAR MACHINE NO.
ARABIC NUMERAL (1, 2, 3, ETC.) = OKAYAMA FACTORY
ALPHABET (A, B, C, ETC.) = SHIGA FACTORY
MANUFACTURER’S TRADEMARKDIRECTION MARK
(ALPHANUMERIC
CHARACTER)
TERMINAL TYPE
(1 = W/PROJECTION)
(B = NO PROJECTION)
MANUFACTURER’S INTERNAL CODE
ARM MATERIAL
(A = Cu ALLOY)
(C = Cu ALLOY)
TRIP TEMPERATURE - °C
(72, 77, 82, 85)
SERIES DESIGNATOR
BOURNS www bums cam/aocsflega‘/d\sc\z\mev gm
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
NR Series Breaker (Thermal Cutoff Device)
Caution when using Breaker
Before using the breaker, please fully read the DESIGN AND HANDLING CAUTIONS stated below to avoid breaker performance deterioration
and/or damage to the breaker body or terminal.
DESIGN CAUTIONS
1. Use within the electrical ratings specified in this data sheet. If used over the rating of voltage or current, ON-OFF life might be impacted
and contact may deteriorate due to breaker arm damage.
2. If used over the maximum electrical rating specified in this data sheet, the circuit may not open safely or operate properly. Please test your
device for any abnormalities and confirm that the breaker will open the circuit safely in your device.
3. Mount the breaker on your device where heat is the highest in order to transfer it effectively to the breaker.
4. If the breaker is affixed with an adhesive (resin, etc.), before proceeding, fully test, evaluate and verify that the adhesive presents no
negative effects on the breaker.
5. After the breaker is mounted, affix it so that the breaker body and terminals will not move. If not affixed properly, breaker resistance could
increase or contact could open due to stress during handling or vibration/shock during transportation.
6. Mount the breaker body and terminals in a straight and flat direction. If the body and terminals are mounted in a twisted condition, breaker
resistance could increase or create body damage.
7. If breaker is to be resin-molded, test and evaluate the application to determine whether the breaker can be used effectively.
8. The breaker cannot be used as a repetitive ON-OFF thermostat.
9. The breaker is not washable. Do not wash.
10. The breaker is not designed or warranted for flow, reflow or hand-soldering applications. If such application is required, you will need to
evaluate whether the breaker is suitable for your specific application.
11. When mounting and after mounting the breaker, do not apply supersonic vibration. Vibration and heat may cause breaker resistance
to increase or may cause body damage. If you plan to apply supersonic vibration after mounting the breaker, you will need to evaluate
whether the breaker is suitable for your specific application. The breaker is not designed or warranted to withstand supersonic vibration.
12. Do not use the breaker in the following environments:
a) Water, oil, chemical or organic solutions
b) Direct sunlight, outdoor exposure, dust
c) Dew condensation, where the breaker could get wet
d) Salt breeze, chlorine, hydrogen sulfide, ammonium, sulfide-oxidation, hydrogen chloride, and anywhere there is a possibility of
generating corrosive gas such as sulfurous acid gas
e) Strong static electric charge or electromagnetic wave
13. The breaker is not designed or tested for, and should not be used in, aerospace, airplane, nuclear, military, life-sustaining medical and
other related applications.
BOURNS' www bums nowanns/‘ega‘lmsc‘mmev gm
REV. 05/22/18
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
NR Series Breaker (Thermal Cutoff Device)
Caution when using Breaker (Continued)
HANDLING CAUTIONS
1. Since the breaker body is composed of plastic parts, do not clamp or dent with tools as this could cause a resistance increase or body
damage.
2. Breaker terminals are thin copper-alloy with right angle edges. Handle carefully to avoid injury to fingers. Handling while wearing finger
cots and using tweezers is recommended.
3. When welding breaker terminals or mounting the breaker on a cell or PCM board, be careful to avoid placing excessive stress on the
breaker body and terminals. Excessive stress may cause a resistance increase or body damage. Please refer to the following cautions:
a) Do not apply more than 5 N moment to the breaker body (refer to Figure 1)
b) Do not apply more than 1.5 cN-m twist torque to the breaker body (refer to Figure 2)
c) Do not apply more than 15 N bending force to the breaker body (refer to Figure 3)
d) Do not apply more than 0.4 cN-m twist torque to the breaker terminals (refer to Figure 4)
e) Do not apply more than 2 N force to the breaker terminals (refer to Figure 5)
f) Do not bend terminals more than 45 ° at root (refer to Figure 6)
g) Do not twist terminals more than 20 ° with the breaker body affixed.
4. In breaker body welding, normally there is direct welding (Figure 7) and series welding (Figure 8). In either case, use a suitable jig so that
stress will not exceed the limits stated above.
5. Pull-and-detach strength of the terminal welding should be to your own specification. If the welding result is controlled by resistance,
measurement should be made at a close point to the breaker body by “DC 4-point clip method” using a milliohm meter to ensure accuracy
(refer to Figure 9).
6. Avoid putting excessive stress as shown above in 3-a) to 3-g) when the jig is used for welding/additional processing.
7. Confirm the resistance value after each time an additional process is applied.
Rod A
Rod B
Rod A
Figure 1 Figure 2
Figure 9
Figure 3 Figure 4
Figure 5 Figure 6 Figure 7 Figure 8
Rod B
45 °
45 °
45 °
45 °
milliohm meter
Due to possible updates to safety standards and other reasons, there may be changes in
specifications for this data sheet without prior notification. Therefore, before design-in for
your application, please contact us for the most up-to-date specifications.
BOURNS'
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and
its affiliates (collectively, “Bourns”).
Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change
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statements regarding the suitability of products for certain types of applications are based on Bourns’ knowledge of typical
requirements in generic applications. The characteristics and parameters of a Bourns® product in a user application may vary
from the data sheet characteristics and parameters due to (i) the combination of the Bourns® product with other components
in the user’s application, or (ii) the environment of the user application itself. The characteristics and parameters of a Bourns®
product also can and do vary in different applications and actual performance may vary over time. Users should always verify
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judgments regarding the amount of additional test margin to design into their device or application to compensate for
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C1753 05/17/18R

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