LTC5505 - RF Power Detector with Buffered Output and >40dB Dynamic Range


  • Internal Schottky Diode RF Detector with Two Input Power Ranges:
    LTC5505-1, –28dBm to 18dBm
    LTC5505-2, –32dBm to 12dBm
  • Wide Input Frequency Range: 300MHz to 3GHz (LTC5505-1); 300MHz to 3.5GHz (LTC5505-2)
  • Temperature Compensated
  • Buffered Detector Output
  • Wide VCC Range of 2.7V to 6V
  • Low Operating Current: 0.5mA
  • Low Shutdown Current: <2µA
  • Low Profile (1mm) ThinSOT Package

Typical Application

LTC5505 Typical Application


The LTC5505-X is an RF power detector for RF applications operating in the 300MHz to 3.5GHz range. A temperature compensated Schottky diode peak detector and buffer amplifier are combined in a small 5-pin ThinSOT package. The supply voltage range is optimized for operation from a single lithium-ion cell or 3xNiMH.

The RF input voltage is peak detected using an on-chip Schottky diode. The detected voltage is buffered and supplied to the VOUT pin. A power saving shutdown mode reduces supply current to less than 2µA.

The LTC5505-1 operates with input power levels from –28dBm to 18dBm. The LTC5505-2 operates with input power levels from –32dBm to 12dBm.


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
LTC5505-1ES5#PBF SOT-23 S5 E 05-08-1635 Yes
LTC5505-1ES5#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LTC5505-1ES5#TRPBF SOT-23 S5 E 05-08-1635 Yes
LTC5505-2ES5#PBF SOT-23 S5 E 05-08-1635 Yes
LTC5505-2ES5#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LTC5505-2ES5#TRPBF SOT-23 S5 E 05-08-1635 Yes

LTC5505 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
LTC5505-1ES5#PBF SOT-23 E $1.42 Yes
LTC5505-1ES5#TRMPBF SOT-23 E $1.47 $1.22 Yes
LTC5505-1ES5#TRPBF SOT-23 E $1.20 Yes
LTC5505-2ES5#PBF SOT-23 E $1.42 Yes
LTC5505-2ES5#TRMPBF SOT-23 E $1.47 $1.21 Yes
LTC5505-2ES5#TRPBF SOT-23 E $1.19 Yes
Buy NowRequest Samples
* 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
DC391A-A LTC5505-1ES5 | -28dBm to 18dBm RF Power Detector (postage stamp) $100.00
DC391A-B LTC5505-2ES5 | -32dBm to 12dBm RF Power Detector (postage stamp) $100.00
Buy Now
Click here to view our complete list of demo boards


  • Multimode Mobile Phone Products
  • PCS Devices
  • Wireless Data Modems
  • Wireless and Cable Infrastructure
  • RF Power Alarm
  • Envelope Detector

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email with questions and comments.

Design Tools


LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:

Technical Support