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

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ DLA SMD Buy Sample
Active 100 5962F0251105V9A
Active SBDIP Tube 1 5962F0251105VEC
Active CFP Tray 1
Active CFP Tray 1 5962F0251105VXC

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
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

News & Additional Resources