MICROSMD250LR-A-2 [LITTELFUSE]
PTC Resettable Fuse;
| 型号： | MICROSMD250LR-A-2 |
| 厂家： | 
LITTELFUSE |
| 描述： | PTC Resettable Fuse |
| 文件： | 总3页 (文件大小：281K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRODUCT: microSMD250LR-A-2
PolySwitch®
DOCUMENT: SCD28261
REV LETTER: E
REV DATE: JULY 26, 2016
PAGE NO.: 1 OF 3
PTC Devices
Overcurrent Protection Device
Specification Status: Released
Maximum Electrical Rating
Voltage: 6VDC
Short Circuit Current: 50A
Notes:
1. Termination Finish: NiAu
2. Drawing not to scale
3. For battery application only
Marking:
L
TABLE I. DIMENSIONS:
A
B
C
D
E
MIN
3.00
MAX
3.43
MIN
0.50
MAX
1.00
MIN
2.35
MAX
2.80
MIN
0.25
MAX
0.75
MIN
0.076
mm:
in:
(0.118) (0.135) (0.019) (0.039) (0.092) (0.110) (0.010) (0.030) (0.003)
TABLE II. PERFORMANCE RATINGS:
CURRENT RATINGS**
TIME TO
TRIP**
RESISTANCE TRIPPED-STATE
VALUES
POWER
DISSIPATION**
WATTS AT
20°C, 6.0V
MAX
AMPERES
AT 0°C
AMPERES
AT 20°C
AMPERES
AT 60°C
SECONDS
AT 20°C, 9.5A
MAX
OHMS
AT 20°C
HOLD TRIP HOLD TRIP HOLD TRIP
MIN MAX*
3.2 7.0 2.5 5.2 1.3 3.0
5.0
.005
.018
1.0
* Maximum resistance is measured 1 hour after reflow.
** Values Specified were determined using PCB’s with 0.025” x 2.0 ounce copper traces.
Agency Recognition:
Reference Document:
Precedence:
Effectivity:
CAUTION:
UL, CSA
PS300
This specification takes precedence over documents referenced herein.
Reference documents shall be the issue in effect on the date of invitation for bid.
Operation beyond the rated voltage or current may result in rupture, electrical arcing or flame.
Materials Information
ROHS Compliant
ELV Compliant
Pb-Free
Halogen Free*
HF
* Halogen Free refers to: Br≤900ppm, Cl≤900ppm, Br+Cl≤1500ppm.
© 2016 Littelfuse,Inc
Littelfuse.com
Specifications are subject to change without notice.
Revised July 26, 2016
PRODUCT: microSMD250LR-A-2
PolySwitch®
DOCUMENT: SCD28261
REV LETTER: E
REV DATE: JULY 26, 2016
PAGE NO.: 2 OF 3
PTC Devices
Overcurrent Protection Device
Recommended pad layout (mm.)
2.00
2.65
1.00
1.00
Recommended reflow profile
Pb-Free
Assembly
Profile Feature
Average ramp up rate (Tsmax to
Tp)
3°C/s max.
Preheat
150°C
200°C
60-120s
• Temperature min. (Tsmin
• Temperature max. (Tsmax
• Time (tsmin to tsmax
)
)
)
Time maintained above:
• Temperature (TL)
• Time (tL)
217°C
60-150s
Peak/Classification
temperature (Tp)
260°C
Time within 5°C of actual peak
temperature (tp)
30s max.
Ramp down rate
2°C/s max.
Time 25°C to peak temperature
8 mins max.
Note: All temperatures refer to top side of the package, measured on the package body surface.
Solder reflow recommendation
Recommended reflow methods: IR, hot air and Nitrogen
Recommended maximum solder paste thickness: 0.25mm
Recommended minimum stencil thickness: 0.1mm
Devices can be cleaned using standard methods and aqueous solvents.
Littelfuse believes the optimum conditions for forming acceptable solder fillets occur when a reasonable
amount of solder paste is placed underneath each device's termination. As such, we request that customers
comply with our recommended solder pad layouts.
Customer should validate that the solder paste amount and reflow recommendations meet its application.
Littelfuse requests that customer board layouts refrain from placing raised features (e.g. vias, nomenclature,
traces, etc.) underneath PolySwitch devices. It is possible that raised features could negatively impact
solderability performance of our devices.
© 2016 Littelfuse,Inc
Littelfuse.com
Specifications are subject to change without notice.
Revised July 26, 2016
PRODUCT: microSMD250LR-A-2
PolySwitch®
DOCUMENT: SCD28261
REV LETTER: E
REV DATE: JULY 26, 2016
PAGE NO.: 3 OF 3
PTC Devices
Overcurrent Protection Device
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their
own applications.Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, lifesaving,
life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired
operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation.
Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall
not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse
documentation.The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.
© 2016 Littelfuse,Inc
Littelfuse.com
Specifications are subject to change without notice.
Revised July 26, 2016
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