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Signal Line Circuit Protector with Three Independent Protectors

Product Details

Key Features

Parametric specs for Signal-Line Protectors
Functions 3-Line
Signal Path Leakage (±nA) (max) 1
ΔRON 7
Analog Signal Range (V) -12.5 to +13.5
VSUPPLY (V) 4.5 to 36.0
VSUPPLY (Dual) (±V) (Dual) 2.25 to 18.0
RON (Ω) (max) 100
Fault Protect. (±V) 40
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.24
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Simplified Block Diagram

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Parameters

Parametric specs for Signal-Line Protectors
Functions 3-Line
Signal Path Leakage (±nA) (max) 1
ΔRON 7
Analog Signal Range (V) -12.5 to +13.5
VSUPPLY (V) 4.5 to 36.0
VSUPPLY (Dual) (±V) (Dual) 2.25 to 18.0
RON (Ω) (max) 100
Fault Protect. (±V) 40
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.24

Key Features

  • ±40V Overvoltage Protection
  • Open Signal Paths with Power Off
  • 100Ω Signal Paths with Power On
  • 1nA Max Path Leakage at +25°C
  • 44V Maximum Supply Voltage Rating
  • Automatic Protection; No Programming or Controls

Applications/Uses

  • Automated Test Equipment (ATE)
  • Data Acquisition
  • Hot-Insertion Boards/Systems
  • Process Control Systems
  • Redundant/Backup Systems
  • Sensitive Instruments

Description

The MAX366 and MAX367 are multiple, two-terminal circuit protectors. Placed in series with signal lines, each two-terminal device guards sensitive circuit components against voltages near and beyond the normal supply voltages. These devices are used at interfaces where sensitive circuits are connected to the external world and could encounter damaging voltages (up to 35V beyond the supply rails) during power-up, power-down, or fault conditions.

The MAX366 contains three independent protectors and the MAX367 contains eight. They can protect analog signals using either unipolar (4.5V to 36V) or bipolar (±2.25V to ±18V) power supplies. Each protector is symmetrical. Input and output terminals may be freely interchanged.

These devices are voltage-sensitive MOSFET transistor arrays that are normally on when power is applied and normally open circuit when power is off. With ±10V supplies, on-resistance is 100Ω max and leakage is less than 1nA at +25°C.

When signal voltages exceed or are within approximately 1.5V of either power-supply voltage (including when power is off), the two-terminal resistance increases dramatically, limiting fault current as well as output voltage to sensitive circuits. The protected side of the switch maintains the correct polarity and clamps approximately 1.5V below the supply rail. There are no "glitches" or polarity reversals going into or coming out of a fault condition.

Simplified Block Diagram

MAX366, MAX367: Typical Operating Circuit MAX366, MAX367: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .