ZL70572UDJ

Medical Surge Protection Device, 5-Terminal, Neurostimulator Application

Key Features

• Enhanced Performance
  • Extremely fast turn-on
  • Extremely low leakage allows terminals to be connected in parallel to the device being protected
• Eases Design
  • Variants with five, six, or seven terminals support a range of application requirements
  • Very small size supports trend for miniaturization
• Packaging and Availability
  • Package: Solder bumped die or wire-bondable bare die
• Superior Quality
  • QA procedures based on MIL-PRF-38535
  • Wafer-level traceability
  • Lot acceptance testing included

Protects Implantable Medical Devices from Damage Resulting from an External Defibrillation Event

In Response to the Voltage Rising to a Dangerous Level, the Surge Protection Device Rapidly Turns On and Shunts the Current

Implantable medical electronics such as pacemakers and neurostimulators are used to treat a wide range of illnesses including bradycardia, tachycardia, Parkinson’s disease, chronic pain, and muscle spasticity. To maintain reliability, these implantable devices must be able to withstand electrical surges, such as those caused by medical treatments like external defibrillation.

As a typical example, the diagram shown below of a dual-chamber pacemaker demonstrates how a typical surge protection device protects sensitive circuitry from transient currents. Designed with extremely low leakage during normal pacing voltages, the terminals of the surge protection device are connected in parallel with those of the protected pacemaker pins.

When the voltage between the terminals rises to a dangerous level, the device rapidly turns on and shunts the current.  Surge suppression occurs through a self-triggering thyristor-diode, coupled with a diode between each branch-input and common node. When a transient current is forced between two terminals, the positive terminal is clamped to the common node by the diode of one branch, and the negative terminal to the forward voltage of the thyristor-diode on the other branch. The low on-voltage of the thyristor ensures that voltage remains at a safe value during the transient.

Extremely fast turn-on and low leakage current eases compliance with regulations EN-45502 for active implantable medical devices, and EN-50061 for implantable cardiac pacemakers.

Packaging Information

• Soldering Profiles
• Moisture Sensitivity
• Shelf Life