LT8302 - 42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch


  • 2.8V to 42V Input Voltage Range
  • 3.6A, 65V Internal DMOS Power Switch
  • Low Quiescent Current:
    106μA in Sleep Mode
    380μA in Active Mode
  • Quasi-Resonant Boundary Mode Operation at Heavy Load
  • Low Ripple Burst Mode® Operation at Light Load
  • Minimum Load < 0.5% (Typ) of Full Output
  • No Transformer Third Winding or Opto-Isolator Required for Output Voltage Regulation
  • Accurate EN/UVLO Threshold and Hysteresis
  • Internal Compensation and Soft-Start
  • Temperature Compensation for Output Diode
  • Output Short-Circuit Protection
  • Thermally Enhanced 8-Lead SO Package

Typical Application

LT8302 Typical Application
LT8302 Typical Application


The LT®8302 is a monolithic micropower isolated flyback converter. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no third winding or opto-isolator for regulation. The output voltage is programmed with two external resistors and a third optional temperature compensation resistor. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple. A 3.6A, 65V DMOS power switch is integrated along with all the high voltage circuitry and control logic into a thermally enhanced 8-lead SO package.

The LT8302 operates from an input voltage range of 2.8V to 42V and delivers up to 18W of isolated output power. The high level of integration and the use of boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application solution for isolated power delivery.


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
LT8302ES8E#PBF SO-8E S8E E 05-08-1857 Yes
LT8302ES8E#TRPBF SO-8E S8E E 05-08-1857 Yes
LT8302HS8E#PBF SO-8E S8E H 05-08-1857 Yes
LT8302HS8E#TRPBF SO-8E S8E H 05-08-1857 Yes
LT8302IS8E#PBF SO-8E S8E I 05-08-1857 Yes
LT8302IS8E#TRPBF SO-8E S8E I 05-08-1857 Yes
LT8302MPS8E#PBF SO-8E S8E MP 05-08-1857 Yes
LT8302MPS8E#TRPBF SO-8E S8E MP 05-08-1857 Yes

LT8302 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
LT8302ES8E#PBF SO-8E E $4.96 $3.47 Yes
LT8302ES8E#TRPBF SO-8E E $3.53 Yes
LT8302HS8E#PBF SO-8E H $5.69 $3.98 Yes
LT8302HS8E#TRPBF SO-8E H $4.04 Yes
LT8302IS8E#PBF SO-8E I $5.34 $3.74 Yes
LT8302IS8E#TRPBF SO-8E I $3.80 Yes
LT8302MPS8E#PBF SO-8E MP $15.22 $10.65 Yes
LT8302MPS8E#TRPBF SO-8E MP $10.71 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
DC2014A LT8302ES8E Isolated Demo Board | 10V ≤ VIN ≤ 30V, VOUT = 5V @ 2.2A $125.00
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Click here to view our complete list of demo boards


  • Isolated Automotive, Industrial, Medical Power Supplies
  • Isolated Auxiliary/Housekeeping Power Supplies

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