RH1965 - Radiation Hardened 0.9A, Low Noise, Low Dropout Linear Regulator with Shutdown


  • Processed in Compliance with LTC Certified MIL-PRF-38535 Class V Flow 
  • Output Current: 0.9A
  • Typical Dropout Voltage: 300mV at 0.9A
  • Low Noise: 40μVRMS (10Hz to 100kHz)
  • <1μA Quiescent Current in Shutdown
  • 500μA Quiescent Current
  • Wide Input Voltage Range: 1.8V to 20V
  • No Protection Diodes Needed
  • Controlled Quiescent Current in Dropout
  • Adjustable Output from 1.2V to 19.5V
  • Stable with 10μF Tantalum Output Capacitor
  • Reverse-Battery Protection
  • No Reverse Current
  • Current Limit with Foldback Protection
  • Thermal Limiting

Radiation Performance

  • Total Ionizing Dose (TID) Tolerance, per TM1019.8, MIL-STD-883:
    200kRad (Si), per condition A at 50Rads(Si)/sec
    - 100kRad (Si), per condition D at 10mRads(Si)/sec
    ELDRS Pass 100kRad(Si)
  • Displacement Damage Defect (DDD) Tolerance up to 1E12 Neutrons/cm2

Typical Application

RH1965 Typical Application


The RH1965 is a radiation hardened low noise, low dropout linear regulator with an integrated PNP pass transistor that operates from a single supply of as little as 1.8V. It can supply up to 0.9A of output current with a 300mV typical dropout voltage, dependent on the internal bond wire length/resistance of the chosen package.

Output voltage range is adjustable from 1.2V to 19.5V by means of a resistor divider on the output. Operating quiescent current is 500μA, reducing to <1μA in shutdown. Quiescent current is well controlled and does not rise in dropout as with many other regulators. The RH1965 regulator has very low output noise that is ideal for sensitive RF and DSP supply applications.

The RH1965 has been optimized for tantalum output capacitors and is stable with values as low as 10μF with an ESR of less than 1Ω. Applications with large output load transients require a larger output capacitor value to minimize output voltage change. Internal protection circuitry includes reverse-battery protection, current limiting with foldback, thermal limiting and reverse-current protection.

Third Party Vendor Availability

Linear Technology partners with third party vendors who assemble and test packaged products with LTC RH Dice inside. For MSK prefix products please click on the Part Number in the table below and scroll down the linked page to find the part number.

Part Number Description SCD or SMD#
MSK5965RH 0.9A Adjustable LDO Regulator -


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

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

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


  • Logic Power Supplies
  • Post Regulator for Switching Supplies
  • Low Noise Instrumentation

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