The IS-1825ASRH, IS-1825BSRH, IS-1825BSEH, ISL71823ASRH, and ISL71823BSRH are single event and total dose hardened pulse width modulators designed to be used in high-frequency switching power supplies in either voltage or current-mode configurations. These devices include a precision voltage reference, a low power start-up circuit, a high-frequency oscillator, a wide-band error amplifier, and a fast current-limit comparator. The IS-1825xSRH and IS-1825xSEH feature dual, alternating output operating from zero to less than 50% duty cycle, and the ISL71823xSRH features dual in-phase output operating from zero to less than 100% duty cycle. The B versions of the parts test the delay from clock out to PWM output switching after power has been applied to the modulator (tPWM). The SEH parts are wafer-by-wafer acceptance tested to 50krad(Si) at a low dose rate of <10mrad(Si)/s. Constructed with the Rad Hard Silicon Gate (RSG) dielectrically isolated BiCMOS process, these devices are immune to single-event latch-up and have been specifically designed to provide a high level of immunity to single-event transients. All specified parameters are established and tested for 300krad(Si) total dose performance. The devices are offered in a 16 Ld CDIP or a 20 Ld CDFP and fully specified to across the temperature range of -50 °C to +125 °C.


  • Electrically screened to DLA SMD# 5962-02511
  • QML qualified per MIL-PRF-38535 requirements
  • EH version is wafer-by-wafer acceptance tested to 50krad(Si) LDR
  • Oscillator frequency: 1MHz (max)
  • High output drive current: 1A peak (typ)
  • Low startup current: 300μA (max)
  • Undervoltage lockout
  • Start threshold: 8.8V (max)
  • Stop threshold: 7.6V (min)
  • Hysteresis: 300mV (min)
  • Pulse-by-pulse current limiting
  • Programmable leading edge blanking
  • Radiation hardness
  • High Dose Rate (HDR) (50-300rad(Si)/s): 300krad(Si)
  • Low Lose Rate (LDR) (0.01rad(Si)/s): 50krad(Si)
  • Latch-up immune (dielectrically isolated)
  • SEU immune: LET= 35MeV•cm2/mg


  • Voltage or current-mode switching power supplies
  • Control of high current MOSFET drivers
  • Motor speed and direction control

Product Options

Part Number Part Status Pkg. Type Carrier Type DLA SMD Buy Sample
Active SBDIP Tube
Active CFP Tray
Active SBDIP Tube 5962F0251102QEC
Active CFP Tray 5962F0251102QXC
Active SBDIP Tube 5962F0251102VEC
Active CFP Tray 5962F0251102VXC

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
IS-1825xSRH, IS-825xSEH, ISL71823xSRH Datasheet Datasheet PDF 575 KB
Application Notes & White Papers
Wafer by Wafer Low Dose Rate Acceptance White Paper White Paper PDF 533 KB
AN9867: End of Life Derating: A Necessity or Overkill Application Note PDF 338 KB
PCN10123 - Alternate Die Attach Material for Assembly of Intersil Hermetic Packaged Products - Intersil Palm Bay, FL. (ISP) Product Change Notice PDF 230 KB
Intersil Space Products Brochure Brochure PDF 3.14 MB
IS-1825ASRH iSim:PE Model Schematic SXSCH 254 KB
PIN19011 - Price Increase for the Listed Renesas Electronics America (REA) Radiation Hardened Space Products Price Increase Notice PDF 360 KB
Standard Microcircuit Drawing 5962-02511 (IS-1825ASRH, ISL71823ASRH, IS-1825BSRH, IS-1825BSEH, ISL71823BSRH) Other 0 KB
IS-1825ASRH SEE Test Report Report PDF 666 KB
Intersil Commercial Lab Services Brochure PDF 364 KB
IS-1825ASRH Total Dose Test Report Report PDF 3.96 MB
PA11003 - Packing Method Change for Intersil TO-xx Metal Can and Flat Pack Packaged Products Product Advisory PDF 499 KB

News & Additional Resources