T4-LDS-xxxx, Rev x (10-02-14) ©2013 Microsemi Corporation Page 1 of 6
Voidless-Hermetically-Sealed Unidirectional 150 W
Low-Capacitance Transient Voltage Suppressors
This series of voidless-hermetically-sealed unidirectional low-capacitance Transient Voltage Suppressor
(TVS) designs are ideal for protecting higher frequency applications in high-reliability applications where
a failure cannot be tolerated. They include a unique rectifier diode in series and opposite direction from
the TVS to achieve a very low capacitance of 4 pF. This product series provides a working peak
“standoff” voltage selection from 6.8 to 170 volts with 150 watt ratings. They are very robust in hard-
glass construction and also use an internal metallurgical bond identified as Category 1 for high reliability
applications. These devices are also available in axial leaded packages for thru-hole mounting.
“A” SQ-MELF
Package
Also available in:
“A” Package
(axial-leaded)
1N8149 – 1N8182
Important: For the latest information, visit our website http://www.microsemi.com.
High surge current and peak pulse power unidirectional protection for sensitive circuits.
Very low capacitance for high frequency or high baud rate applications.
Bidirectional capability with two devices in anti-parallel (see Figure 5).
Triple-layer passivation.
Internal “Category 1” metallurgical bonds.
Voidless hermetically sealed glass package.
RoHS compliant versions are available.
High reliability transient protection.
Extremely robust construction.
Working peak “standoff” voltage (V
WM
) from 6.8 to 170 volts.
Available as 150 W peak pulse power (P
PP
) at 10/1000 µs.
Lowest available capacitance for 150 W rated TVS.
ESD and EFT protection per IEC61000-4-2 and IEC61000-4-4 respectively.
Secondary lightning protection per select levels in IEC61000-4-5.
Square-end-cap terminals for easy placement.
Nonsensitive to ESD per MIL-STD-750 method 1020.
Inherently radiation hard as described in Microsemi MicroNote 050.
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841 Gort Road Business Park, Ennis, Co. Clare, Ireland
1-800-446-1158
(978) 620-2600
Fax: (978) 689-0803 Tel: +353 (0) 65 6840044 Fax: +353 (0) 65 6822298
MSC – Ireland
Gort Road Business Park,
Ennis, Co. Clare, Ireland
Tel: +353 (0) 65 6840044
Fax: +353 (0) 65 6822298 Tel: +353 (0) 65 6840044 Fax: +353 (0) 65 6822298
Website:
www.microsemi.com
Parameters/Test Conditions
Junction and Storage Temperature
Capacitance at zero volts
Thermal Resistance junction to ambient
Peak Pulse Power at 25
o
C (10µs/1000µs)
Impulse repetition rate (duty factor)
Steady State (Average) Power @ T
A
= 25
o
C
Solder Temperature (10 s maximum)
Note: Steady-state power ratings with reference to ambient are for PC boards where thermal resistance from
mounting point to ambient is sufficiently controlled where T
J(MAX)
is not exceeded.