PTC resettable fuse, 1206 footprint, 1.1 A hold
The Littelfuse 1206L110WR is a surface-mount polymeric PTC resettable fuse from the POLY-FUSE® 1206L series, designed to protect low-voltage DC circuits up to 8 V. Its 1.1 A hold current (Ih) and 2.2 A trip current (It) define the normal operating window and the threshold at which the device switches to a high-resistance state to limit fault current. Packaged in a standard 1206 (3216 Metric) concave SMD footprint, it mounts directly to the PCB and is rated for a maximum interrupt current of 100 A. The 100 ms trip time at 8 V means it responds quickly to overcurrent events, limiting energy let-through to downstream components.
Obsolete — sourcing through independent channels
Littelfuse has marked the 1206L110WR as obsolete. For existing BOM positions, availability is limited to surplus and broker inventory. Stock is lot-specific; quantities, date codes, and pricing are confirmed at the time of RFQ.
Parametric profile for BOM-fit check
Initial resistance (Ri) is 40 mOhms minimum, rising to 180 mOhms maximum after tripping (R1). The low Ri minimizes I²R losses during normal operation, while the post-trip resistance ensures sufficient voltage drop to hold the device in the tripped state until power is cycled. Operating temperature range spans -40°C to 85°C, covering most indoor and outdoor commercial/industrial environments. The device carries cURus and TUV agency approvals, confirming compliance with North American and IEC safety standards for polymeric PTC overcurrent protectors.