© 2016 TELEDYNE RELAYS (800) 284-7007 • www.teledynerelays.com LB363Page 1
Series LB363
LoopBack Relay
Up to 12Gbps
LB363\012016\Q1
DESCRIPTION
The LoopBack Series relay combines two DPDT
electromechanical relays in one package that includes
an internal bypass path for Automated Test
Equipment (ATE) applications. The LoopBack
combines the technology of two Teledyne RF/GRF303
Series relays which eliminates the need for external
PCB traces in loop back test applications. This
innovation results in superior signal integrity and RF
performance while taking minimal board space. The
LB363 Series is designed for digital signaling
application and provides excellent signal integrity up to
16 Gbps data rates.
The internal in-line capacitors allow you to eliminate
the footprints for external components, while
performing AC bypass functions internal to the relay.
The capacitors used feature excellent signal integrity
as well as low loss high frequency performance.
A typical loop-back load board application uses the
Device Under Test (DUT) to test itself. In this method,
the transmitter from the DUT is connected through a
loop back path to the receiver of the DUT. The double
pole design of the LoopBack relay is perfectly suited
for differential signaling, allowing the relay to provide
transmit and receive signals and their inversions to the
DUT or through the bypass path.
The internal structure of the LoopBack relay reduces
the number of discontinuities and shortens the signal
path during loop back testing, providing lower
insertion loss and higher signal integrity performance
than two RF/GRF303 Series relays. In the normally
closed mode (de-energized) the LoopBack relay
provides four normally closed contacts. When
energized, the moving contacts are connected
together across the loop back structure to provide two
through paths. The normally closed contacts have
similar performance to RF/GRF303 Series relays.
This LoopBack relay is available in a surface mount
ground shield and stub pins/or J-lead confi guration to
provide improve high data rate and high requency
performance, as well as improved repeatability.
The DC LoopBack confi guration provides internally
shorted paths to allow “auxiliary” full spectrum signal
routing.
SERIES
DESIGNATION
RELAY TYPE
LB363 LoopBack Relay, Sensitive Coil, thru-hole with AC Bypass Capacitors
ENVIRONMENTAL AND PHYSICAL SPECIFICATIONS
Temperature
(Ambient)
Storage –65°C to +125°C
Enclosure Hermetically sealed
Operating –55°C to +85°C
Vibration
(General Note 1)
10 g’s to 500 Hz
Shock
(General Note 1)
30 g’s,
6ms half sine
Weight LB363 0.16 oz. (4.53g) max. GLB363 0.18 oz. (5.10g) max.
LoopBack Relay
LB363 Series
With Built-in AC Bypass Capacitors
LB363 Page 2 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE © 2016 TELEDYNE RELAYS
Series LB363
LoopBack Relay
Up to 16Gbps
LB363\012016\Q1
SERIES LB363
T Y PICAL RF Cha rac te ri sti cs (Se e RF No tes o n nex t pag e)
Insertion Loss (RF Note 6)
-1
-0.8
-0.6
-0.4
-0.2
0
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Frequency (MHz)
Insertion Loss (dB)
VSWR (RF Note 6)
1.0
1.2
1.4
1.6
1.8
2.0
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Frequency (MHz)
VSWR
-5.00
-4.50
-4.00
-3.50
-3.00
-2.50
-2.00
-1.50
-1.00
-0.50
0.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00
Insert ion Lo ss (dB)
Frequency (GHz)
AC Bypass Path (thru Capacitor) - Insertion Loss
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00
VSWR
Frequency (GHz)
AC Bypass Path (thru Capacitor) - VSWR
-60.00
-50.00
-40.00
-30.00
-20.00
-10.00
0.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00
Isolation (dB)
Frequency (GHz)
AC Bypass Path (thru Capacitor) - Isolation
Isolation Across Contacts (RF Note 4)
-60
-50
-40
-30
-20
-10
0
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Frequency (MHz)
Isolation (dB)
Isolation Pole to Pole (RF Note 5)
-60
-50
-40
-30
0
-10
-20
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Frequency (MHz)
Isolation (dB)
Normally Closed RF Performance