Resettable PPTC Datasheet
PolySwitch® Resettable PPTC
Battery Strap > LSP Series
Physical Characteristics
Environmental Specifications
Test
Conditions
Resistance Change
0.125 mm nominal thickness,
Lead Material
quarter-hard Nickel
Passive Aging
70 °C, 1000 hrs
10% typ
Tape Material
Polyester
Humidity Aging 85 °C/85% RH, 7 days
5% typ
MIL-STD-883D,
Vibration
No change
Method 2026
Part Numbering System
Notes
Storage conditions: 40 °C max., 70% RH max.; devices should remain in original sealed bags
prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
LSP 380
Product Series
Hold Current Indicator
Packaging and Marking Information
Part Description
Ordering Part Number
Bag Quantity
Standard Package Quantity
Part Marking
LSP380
LSP550
RF4906-000
RF5079-000
1,000
1,000
10,000
10,000
L38
L55
Installation Guidelines for Strap Devices
■ PPTC devices operate by thermal expansion of the conductive
polymer. If devices are placed under pressure or installed in
spaces that would prevent thermal expansion, they may not
properly protect against damage caused by fault conditions.
Designs must be selected in such a manner that adequate space
is maintained over the life of the product.
■ PPTC strap devices are intended to be resistance welded
to battery cells or to pack interconnect straps, yet some
precautions must be taken when doing so. In order for the PPTC
device to exhibit its specified performance, weld placement should
be a minimum of 2 mm from the edge of the PPTC device, weld
splatter must not touch the PPTC device, and welding conditions
must not heat the PPTC device above its maximum operating
temperature.
■ Twisting, bending, or placing the PPTC device in tension will
decrease the ability of the device to protect against damage
caused by electrical faults. No residual force should remain on
device after installation. Mechanical damage to the PPTC device
may affect device performance and should be avoided.
■ PPTC strap devices are not intended for applications where reflow
onto flex circuits or rigid circuit boards is required.
■ The polyester tape on PPTC strap devices is intended for marking
■ Chemical contamination of PPTC devices should be avoided.
Certain greases, solvents, hydraulic fluids, fuels, industrial
cleaning agents, volatile components of adhesives, silicones, and
electrolytes can have an adverse effect on device performance.
and identification purposes only, not for electrical insulation.
Disclaimer Notice - 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 may not be used in, all applications. Read complete Disclaimer Notice at http://www.littelfuse.com/disclaimer-electronics.
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
3
Revised: BA.11/09/21
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