Dual line programmable transient voltage suppressor for SLIC protection

This device has been especially designed to protect 2 new high voltage, as well as classical SLICs, against transient overvoltages.

Positive overvoltages are clamped by 2 diodes. Negative surges are suppressed by 2 thyristors, their breakdown voltage being referenced to -VBAT through the gate. Separated gates allow the SLICs to be supplied by two different voltages.

Key Features

  • Dual line programmable transient voltage suppressor with separated gates
  • Wide negative firing voltage range: VGn = -175 V max.
  • Low dynamic switching voltages: VFP and VDGL
  • Low gate triggering current: IGT = 5 mA max
  • Peak pulse current: IPP = 40 A (5/310 μs)
  • Holding current: IH = 150 mA min.



Description Version Size
ST Protection Finder - The new app for Android and iOS 1.0 1 MB

HW Model & CAD Libraries

HW Model & CAD Libraries
Description Version Size
LCDP1521S PSpice model (.lib) and symbols (.olb) 1.0 3 KB


Description Version Size
DS6477 DS6477: Dual line programmable transient voltage suppressor for SLIC protection 7.0 601 KB
Technical Notes & Articles
Description Version Size
TN1173 TN1173: Packing information for IPAD™, protection, rectifiers, thyristors and AC Switches 5.0 1 MB


Design Tools
Smart selectors


型号 Marketing Status Stand-off voltage (V) (nom) Directionality Package Packing Type Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
LCDP1521SRL Active - Uni-Directional SO-8 Tape And Reel 0.428 100 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors


型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LCDP1521SRL ActiveSO-8IndustrialEcopack2 0 0

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.