ZEN132V075A48LS Datasheet, PDF (1/9 Pages) Littelfuse – Minimal power dissipation requirements

PolyZen
Polymer Enhanced Zener Diode
Micro-Assemblies
PRODUCT : ZEN132V075A48LS
DOCUMENT : SCD27364
REV LETTER : D
REV DATE: JULY 26, 2016
PAGE NO.: 1 OF 8
Specification Status: RELEASED
GENERAL DESCRIPTION
Littelfuse Circuit Protection 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 electrically in
series between VIN and the diode clamped VOUT.
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
 Stable VZ vs fault current
 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
 DC output voltage regulation
TYPICAL APPLICATION BLOCK DIAGRAM
Power Supply
(External or Internal)
PolyZen Protected Electronics
GND
2
V_{IN 1 PolyZen}
+
Device
V_OUT
3 Regulated
Output
R_Load
Protected downstream
electronics
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised July 26, 2016
littelfuse.com