K1200S1URP

Overview

The Littelfuse K1200S1URP is a high-voltage trigger diode (SIDAC) from the Kxxx0yU series, designed for AC/DC circuit protection. It features a DO-214AC (SMB) surface-mount package with two leads. Key electrical parameters include a breakover voltage (VBO) of 125 V and a rated repetitive off-state voltage (VDRM) of 100 V. The device supports an RMS on-state current (It RMS) of 1 A and a non-repetitive peak on-state current of 20 A. It operates within a temperature range of -40°C to +125°C, with a maximum holding current of 80 mA and a low on-state voltage of 1.2 V.

Feature Summary

• Provides bidirectional overvoltage protection for sensitive electronic circuits
• Utilizes silicon unilateral voltage-triggered switch technology for reliable triggering
• Designed for surface-mount assembly in compact PCB layouts

Applications

• Surge protection in AC-DC power supply inputs
• Overvoltage protection for telecommunications equipment
• Protection circuits in consumer electronics and LED drivers

Procurement Notes

Verify the specific suffix 'URP' against the official Littelfuse datasheet to confirm reel packaging and tape-and-reel specifications. Ensure the ordered component matches the exact K1200S1URP designation, as minor suffix variations may indicate different packaging or compliance statuses. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm authenticity and traceability before procurement.

Selection Notes

Select this component when a breakover voltage near 125 V is required for transient suppression in surface-mount designs. Compare the 1 A RMS current rating against the expected load currents to ensure adequate margin. Evaluate the DO-214AC footprint compatibility with existing PCB silkscreens. Consider the operating temperature range of up to 125°C for thermal management requirements in enclosed environments.

Part Context

The K1200S1URP belongs to the Teccor K-series SIDAC family, which are silicon unilateral voltage-triggered switches. These devices are optimized for rectified AC and DC circuit applications. The K-series provides robust overvoltage protection by switching to a low-impedance state when the applied voltage exceeds the breakover threshold, thereby clamping transients and protecting downstream components.

Replacement Considerations

Direct replacements must match the 125 V breakover voltage, 1 A RMS current, and DO-214AC package. Verify that alternative SIDACs from other manufacturers offer comparable holding current and leakage characteristics. Confirm that any substitute maintains the same unidirectional switching behavior and thermal performance ratings.