PolyZen

Polymer Enhanced Zener Diode

Micro-Assemblies

PRODUCT : ZEN164V130A24LS

DOCUMENT: SCD27330

REV LETTER: D

REV DATE: JULY 26, 2016

PAGE NO.: 1 OF 10

© 2016 Littelfuse,Inc.

littelfuse.com

Specifications are subject to change without notice.

Revised July 26,2016

Specification Status: Released

GENERAL DESCRIPTION

Littelfuse PolyZen devices are polymer

enhanced, precision Zener diode micro-

assemblies. They offer resettable

protection against multi-Watt fault

events without the need for multi-Watt

heat sinks.

The Zener diode used for voltage

clamping in a PolyZen micro-assembly

was selected due to its relatively flat voltage vs current

response. This helps improve output voltage clamping,

even when input voltage is high and diode currents are

large.

An advanced feature of the PolyZen micro-assembly is that

the Zener diode is thermally coupled to a resistively non-

linear, polymer PTC (positive temperature coefficient) layer.

This PTC layer is fully integrated into the device, and is

This advanced PTC layer responds to either extended

diode heating or overcurrent events by transitioning from a

low to high resistance state, also known as ”tripping”. A

tripped PTC will limit current and generate voltage drop. It

helps to protect both the Zener diode and the follow on

electronics and effectively increases the diode’s power

handling capability.

The polymer enhanced Zener diode helps protect sensitive

portable electronics from damage caused by inductive

voltage spikes, voltage transients, incorrect power supplies

and reverse bias. These devices are particularly suitable

for portable electronics and other low-power DC devices.

BENEFITS



Stable Zener diode helps shield

downstream electronics from

overvoltage and reverse bias

 Trip events shut out overvoltage and

reverse bias sources

 Analog nature of trip events minimizes

upstream inductive spikes

 Minimal power dissipation requirements

 Single component placement

FEATURES



Overvoltage transient suppression





Time delayed, overvoltage trip



Time delayed, reverse bias trip



Multi-Watt power handling capability



Integrated device construction



RoHS Compliant

TARGET APPLICATIONS



DC power port protection in portable

electronics



DC power port protection for systems

using barrel jacks for power input



Internal overvoltage & transient

suppression

TYPICAL APPLICATION BLOCK DIAGRAM

GND

V

IN

V

OUT

Regulated

Output

R

Load

Protected downstream

electronics

1

2

3

+

Power Supply

(External or Internal)

PolyZen Protected Electronics

PolyZen

Device

GND

V

IN

V

OUT

Regulated

Output

R

Load

Protected downstream

electronics

1

2

3

+

Power Supply

(External or Internal)

PolyZen Protected Electronics

GND

V

IN

V

OUT

Regulated

Output

R

Load

Protected downstream

electronics

1

2

3

+

Power Supply

(External or Internal)

PolyZen Protected Electronics

PolyZen

Device