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Manufacturer Part #


CAT811 Series 2.93V 140ms 4-Pin Microprocessor Power Supply Supervisor-SOT-143

Product Specification Section
Technical Attributes
Attributes Table
No of Outputs: Single
Threshold Voltage: 2.93|V
Supply Voltage-Max: 5.5V
Reset Timeout: 140ms
Package Style:  SOT-143 (TO-253-4)
Mounting Method: Surface Mount
Features & Applications

The CAT811 and CAT812 are microprocessor supervisory circuits that monitor power supplies. The CAT811and CAT812 are direct replacements for the MAX811 and MAX812 in applications operating over the industrial temperature range; both have a manual reset input.

These devices generate a reset signal, which is asserted while the power supply voltage is below a preset threshold level and for at least 140ms after the power supply level has risen above that level. The underlying floating gate technology, AE2(TM) used by Catalyst Semiconductor, makes it possible to offer any custom reset threshold value. Seven industry standard threshold levels are offered to support +5.0V, +3.3V, +3.0V and +2.5V systems.

The CAT811 features a RESET push-pull output (active LOW) and the CAT812 features a RESET push-pull output (active HIGH). Fast transients on the power supply are ignored and the output is guaranteed to be in the correct state at Vcc levels as low as 1.0 V. The CAT811/812 are fully specified over the industrial temperature range (-40°C to 85°C) and are available in a compact 4-pin SOT-143 package.

Key Features:

  • Precision monitoring of
    • +5.0 V (± 5%, ± 10%, ± 20%),
    • +3.3 V (± 5%, ± 10%),
    • +3.0 V (± 10%) and
    • +2.5 V (± 5%) power supplies
  • Manual reset input
  • Offered in two output configurations:
    • CAT811: Active LOW reset
    • CAT812: Active HIGH reset
  • Direct replacements for the MAX811 and MAX812 in applications operating over the industrial temperature range
  • Reset valid down to VCC = 1.0V
  • 6μA power supply current
  • Power supply transient immunity
  • Available in SOT-143 packages with Sn or NiPdAu Green Lead finishes.
  • Industrial temperature range: -40ºC to +85ºC


  • Computers, Servers, Laptops
  • Cable modems
  • Wireless communications
  • Embedded control systems
  • White goods
  • Power meters
  • Intelligent instruments
  • PDAs and handheld equipment
Pricing Section
Minimum Order:
Multiple Of:
Factory Stock:Factory Stock:
Factory Lead Time:
21 Weeks
Web Price