LT4356-3 and LT4356MP-3 - Surge Stopper with Fault Latchoff


  • 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
  • Adjustable Latchoff Fault Timer
  • Controls N-channel MOSFET
  • Shutdown Pin Withstands –60V to 100V
  • Fault Output Indication
  • Auxiliary Amplifier for Level Detection Comparator or Linear Regulator Controller
  • Available in (4mm × 3mm) 12-Pin DFN, 10-Pin MSOP or 16-Pin SO Packages

Typical Application

LT4356-3 Typical Application
LT4356-3 Typical Application


The LT4356-3 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 LT4356-3 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, until the SHDN pin pulls low momentarily.

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. The SHDN input turns off the part, including the auxiliary amplifier, and reduces the quiescent current to less than 7μA.








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
LT4356CDE-3#PBF 4x3 DFN-12 DE/UE C 05-08-1695 Yes
LT4356CDE-3#TRPBF 4x3 DFN-12 DE/UE C 05-08-1695 Yes
LT4356CMS-3#PBF MS-10 MS C 05-08-1661 Yes
LT4356CMS-3#TRPBF MS-10 MS C 05-08-1661 Yes
LT4356CS-3#PBF SO-16 S C 05-08-1610 (S16) Yes
LT4356CS-3#TRPBF SO-16 S C 05-08-1610 (S16) Yes
LT4356HDE-3#PBF 4x3 DFN-12 DE/UE H 05-08-1695 Yes
LT4356HDE-3#TRPBF 4x3 DFN-12 DE/UE H 05-08-1695 Yes
LT4356HMS-3#PBF MS-10 MS H 05-08-1661 Yes
LT4356HMS-3#TRPBF MS-10 MS H 05-08-1661 Yes
LT4356HS-3#PBF SO-16 S H 05-08-1610 (S16) Yes
LT4356HS-3#TRPBF SO-16 S H 05-08-1610 (S16) Yes
LT4356IDE-3#PBF 4x3 DFN-12 DE/UE I 05-08-1695 Yes
LT4356IDE-3#TRPBF 4x3 DFN-12 DE/UE I 05-08-1695 Yes
LT4356IMS-3#PBF MS-10 MS I 05-08-1661 Yes
LT4356IMS-3#TRPBF MS-10 MS I 05-08-1661 Yes
LT4356IS-3#PBF SO-16 S I 05-08-1610 (S16) Yes
LT4356IS-3#TRPBF SO-16 S I 05-08-1610 (S16) Yes
LT4356MPMS-3 MS-10 MS MP 05-08-1661 No
LT4356MPMS-3#PBF MS-10 MS MP 05-08-1661 Yes
LT4356MPMS-3#TR MS-10 MS MP 05-08-1661 No
LT4356MPMS-3#TRPBF MS-10 MS MP 05-08-1661 Yes
LT4356MPS-3 SO-16 S MP 05-08-1610 (S16) No
LT4356MPS-3#PBF SO-16 S MP 05-08-1610 (S16) Yes
LT4356MPS-3#TR SO-16 S MP 05-08-1610 (S16) No
LT4356MPS-3#TRPBF SO-16 S MP 05-08-1610 (S16) Yes

LT4356-3 Package Drawing
LT4356-3 Package Drawing
LT4356-3 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
LT4356CDE-3#PBF 4x3 DFN-12 C $2.83 $1.98 Yes
LT4356CDE-3#TRPBF 4x3 DFN-12 C $2.04 Yes
LT4356CMS-3#PBF MS-10 C $2.83 $1.98 Yes
LT4356CMS-3#TRPBF MS-10 C $2.04 Yes
LT4356CS-3#PBF SO-16 C $2.83 $1.98 Yes
LT4356CS-3#TRPBF SO-16 C $2.04 Yes
LT4356HDE-3#PBF 4x3 DFN-12 H $3.70 $2.59 Yes
LT4356HDE-3#TRPBF 4x3 DFN-12 H $2.65 Yes
LT4356HMS-3#PBF MS-10 H $3.70 $2.59 Yes
LT4356HMS-3#TRPBF MS-10 H $2.65 Yes
LT4356HS-3#PBF SO-16 H $3.70 $2.59 Yes
LT4356HS-3#TRPBF SO-16 H $2.65 Yes
LT4356IDE-3#PBF 4x3 DFN-12 I $3.40 $2.38 Yes
LT4356IDE-3#TRPBF 4x3 DFN-12 I $2.44 Yes
LT4356IMS-3#PBF MS-10 I $3.40 $2.38 Yes
LT4356IMS-3#TRPBF MS-10 I $2.43 Yes
LT4356IS-3#PBF SO-16 I $3.40 $2.38 Yes
LT4356IS-3#TRPBF SO-16 I $2.44 Yes
LT4356MPMS-3 MS-10 MP $8.49 $5.94 No
LT4356MPMS-3#PBF MS-10 MP $8.49 $5.94 Yes
LT4356MPMS-3#TR MS-10 MP $8.55 $6.00 No
LT4356MPMS-3#TRPBF MS-10 MP $8.55 $6.00 Yes
LT4356MPS-3 SO-16 MP $8.49 $5.94 No
LT4356MPS-3#PBF SO-16 MP $8.49 $5.94 Yes
LT4356MPS-3#TR SO-16 MP $6.00 No
LT4356MPS-3#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.

Part Number Description Price Documentation
DC1018B-C LT4356-3 Demo | Overvoltage Protection Regulator with Latch-Off $50.00
Buy Now
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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