The Intersil HCTS139MS is a radiation hardened 2 to 4 line decoder/demultiplexer with an active low enable. Data on the select inputs cause one of the four normally high outputs to go to a low logic level. The demultiplexing function is performed by using the enable input as the data input. The HCTS139MS utilizes advanced CMOS/SOS technology to achieve high-speed operation. This device is a member of the radiation hardened, high-speed, CMOS/SOS logic family with TTL input compatibility. The HCTS139MS is supplied in a 16-lead ceramic flatpack (K suffix) or an SBDIP package (D suffix).


  • 3 micron radiation hardened SOS CMOS
  • Total dose 200K RAD (Si)
  • SEP effective LET no upsets: >100 MEV-cm2/mg
  • Single Event Upset (SEU) immunity <2 x 10-9 errors/bit-day (Typ)
  • Dose rate survivability: >1 x 1012 RAD (Si)/s
  • Dose rate upset >1010 RAD (Si)/s 20ns pulse
  • Latch-up free under any conditions
  • Fanout (over temperature range)
  • Bus driver outputs - 15 LSTTL loads
  • Military temperature range: -55 °C to +125 °C
  • Significant power reduction compared to LSTTL ICs
  • DC operating voltage range: 4.5V to 5.5V
  • LSTTL input compatibility
    • VIL = 0.8V Max
    • VIH = VCC/2 Min
  • Input current levels Ii ≤ 5µA at VOL, VOH


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PDF 533 KB White Paper
PDF 499 KB Product Advisory
PDF 230 KB Product Change Notice
PDF 338 KB Application Note
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Design & Development