LT4356MP-1 and LT4356MP-2 - Surge Stopper


  • Stops High Voltage Surges
  • Adjustable Output Clamp Voltage
  • Overcurrent Protection
  • Wide Operation Range: 4V to 80V
  • Reverse Input Protection to –60V
  • Low 7μA Shutdown Current, LT4356-1
  • Adjustable Fault Timer
  • Controls N-channel MOSFET
  • Shutdown Pin Withstands –60V to 100V
  • Fault Output Indication
  • Guaranteed Operation –55°C to 125°C
  • Auxiliary Amplifier for Level Detection Comparator or Linear Regulator Controller
  • Available in 10-Pin MSOP or 16-Pin SO Packages

Typical Application

LT4356MP-1 Typical Application
LT4356MP-1 Typical Application


The LT4356 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356MP also monitors the voltage drop between the VCC and SNS pins to protect against overcurrent faults. An internal amplifier limits the current sense voltage to 50mV. In either fault condition, a timer is started inversely proportional to MOSFET stress. If the timer expires, the FLT pin pulls low to warn of an impending power-down. If the condition persists, the MOSFET is turned off. After a cooldown period, the GATE pin pulls up turning on the MOSFET again.

The auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an external PNP pass transistor.

Back-to-back FETs can be used in lieu of a Schottky diode for reverse input protection, reducing voltage drop and power loss. A shutdown pin reduces the quiescent current to less than 7μA for the LT4356-1 during shutdown. The LT4356-2 differs from the LT4356-1 during shutdown by reducing the quiescent current to 60μA and keeping alive the auxiliary amplifier for uses such as an undervoltage lockout or always-on regulator.








Low Current Shutdown 7uA 60uA 7uA
Aux Amp In Shutdown OFF Always Alive OFF
Fault Retry Retry Retry Latch Off
Packages DFN-12, MS-10, SO-16 DFN-12, SO-16 DFN-12, MS-10, SO-16
Temp Grades C, I, H, MP C, I, H, MP C, I, H, MP


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT4356MPMS-1 MS-10 MS MP 05-08-1661 No
LT4356MPMS-1#PBF MS-10 MS MP 05-08-1661 Yes
LT4356MPMS-1#TR MS-10 MS MP 05-08-1661 No
LT4356MPMS-1#TRPBF MS-10 MS MP 05-08-1661 Yes
LT4356MPS-1 SO-16 S MP 05-08-1610 (S16) No
LT4356MPS-1#PBF SO-16 S MP 05-08-1610 (S16) Yes
LT4356MPS-1#TR SO-16 S MP 05-08-1610 (S16) No
LT4356MPS-1#TRPBF SO-16 S MP 05-08-1610 (S16) Yes
LT4356MPS-2 SO-16 S MP 05-08-1610 (S16) No
LT4356MPS-2#PBF SO-16 S MP 05-08-1610 (S16) Yes
LT4356MPS-2#TR SO-16 S MP 05-08-1610 (S16) No
LT4356MPS-2#TRPBF SO-16 S MP 05-08-1610 (S16) Yes

LT4356MP-1 Package Drawing
LT4356MP-1 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT4356MPMS-1 MS-10 MP $8.49 $5.94 No
LT4356MPMS-1#PBF MS-10 MP $8.49 $5.94 Yes
LT4356MPMS-1#TR MS-10 MP $8.55 $6.00 No
LT4356MPMS-1#TRPBF MS-10 MP $8.55 $6.00 Yes
LT4356MPS-1 SO-16 MP $8.49 $5.94 No
LT4356MPS-1#PBF SO-16 MP $8.49 $5.94 Yes
LT4356MPS-1#TR SO-16 MP $6.00 No
LT4356MPS-1#TRPBF SO-16 MP $6.00 Yes
LT4356MPS-2 SO-16 MP $8.49 $5.94 No
LT4356MPS-2#PBF SO-16 MP $8.49 $5.94 Yes
LT4356MPS-2#TR SO-16 MP $6.00 No
LT4356MPS-2#TRPBF SO-16 MP $6.00 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


  • Automotive/Avionic Surge Protection
  • Hot Swap/Live Insertion
  • High Side Switch for Battery Powered Systems

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