UM9401 / UM9402 / UM9415
Microsemi
Microwave Products
75 Technology Drive, Lowell, MA. 01851, 978-442-5600, Fax: 978-937-3748
Page 1
TM ®
www.MICROSEMI.com
Copyright 2007
Rev: 2009-02-05
COMMERCIAL TWO W A Y RADIO
ANTENNA SWITCH DIO D ES
RoHS Compliant Versions Available
IMPORTANT: For the most current data, consult our website: www.MICROSEMI.com
ABSOLUTE MAXIMUM RATINGS AT 25º C
(UNLESS OTHERWISE SPECIFIED)
CONDITION UM9401 UM9402 UM9415
Reverse Voltage (VR) @ IR = 10 uA 50V 50V 50V
½ in. total
length to 25 OC
Contact
5.5W 10W
25 oC (Package
Flange
Temperature)
10W
Average Power
Dissipation (PA)
Free Air 1.5W 2.5W
Operating Temp. (TOP) -65
oC to +175 oC
Storage Temp. (TSTG) -65
oC to +175 oC
KEY FEATURES
High transmitter power
UM9401/UM9402 => 100 W
UM9415 => 1000 W
Low harmonic distortion
Low third order distortion
High carrier lifetime
Non cavity design
Thermally matched configuration
Low capacitance at 0 V bias
Low conductance at 0 V bias
Compatible with automatic
insertion equipment
RoHS complaint versions
available. 1
Lead finish
UM9401: Pb/Sn
UM9402: Gold
UM9415: Pb/Sn
UMX9401,UMX9415: Matte Tin
1 - The UM9402 is RoHS complaint.
RoHS compliant versions of the
UM9401 and UM9415 are supplied
as UMX9401, UMX9415. Consult
factory for details.
DESCRIPTION
Microsemi offers a series of PIN diodes specifically designed and
characterized for solid state antenna switches in commercial two-way radios.
Antenna switches using the UM9401 and UM9415 series PIN diodes provide
high isolation, low loss and low distortion characteristics formerly possible
only with electromechanical relay type switches.
The UM9401 and the UM9402 diodes can handle 100 W of transmitter power,
while the UM9415 will handle over 1000 W. The extensive characterization of
these PIN diodes in antenna switch applications has resulted in guaranteed
low distortion specifications under transmit and receive conditions. These
diodes also feature low forward bias resistance and high zero bias impedance
which are required for low loss, high isolation and wide bandwidth antenna
switch performance. For RoHS compliant devices, use the UMX prefix. (IE:
UMX9415)
The UMX series meets RoHS requirements per EU Directive 2002/95/EC.
APPLICATIONS/BENEFITS
Isolated stud package available
Surface mount package available
Maximum soldering temperature
260 oC for 30 seconds.
UM9401 / UM9402
UM9415
UM9401 / UM9402 / UM9415
Microsemi
Microwave Products
75 Technology Drive, Lowell, MA. 01851, 978-442-5600, Fax: 978-937-3748
Page 2
TM ®
www.MICROSEMI.com
Copyright 2007
Rev: 2009-02-05
COMMERCIAL TWO W A Y RADIO
ANTENNA SWITCH DIO D ES
RoHS Compliant Versions Available
ELECTRICAL PARAMETERS @ 25C (unless otherwise specified)
UM9401 / UM9402 UM9415
Parameter Symbol Conditions Min Typ Max Min Typ Max Units
Reverse Current IR VR = 50 V 10 10 uA
Series Resistance RS I
F = 50 mA, F= 100 MHz 0.75 1.0 0.75 1.0 Ω
Capacitance CT VR = 0 V, F = 100 MHZ 1.1 1.5 2.8 4 pF
Parallel Resistance RP V
R = 0 V, F = 100 MHz 5 10 1 2 kΩ
Carrier Lifetime TL I
F = 10 mA 1.0 2.0 5.0 us
Forward Voltage VF I
F = 50 mA 1.0 1.0 V
Transmit Harmonic
Distortion
R2A/A
R3A/A
Pin = 50 W
f = 50 MHz, IF = 50 mA 80 80 -dB
Receive Third Order
Distortion R2AB/A Pin = 10 W, 0 V Bias
fA = 50 MHz, fB = 51 MHz 60 60 -dB
E
EL
LE
EC
CT
TR
RI
IC
CA
AL
LS
S
UM9401 / UM9402 / UM9415
Microsemi
Microwave Products
75 Technology Drive, Lowell, MA. 01851, 978-442-5600, Fax: 978-937-3748
Page 3
TM ®
www.MICROSEMI.com
Copyright 2007
Rev: 2009-02-05
COMMERCIAL TWO W A Y RADIO
ANTENNA SWITCH DIO D ES
RoHS Compliant Versions Available
RS VS IF VF VS IF
-5
10 -4
10 -3
10 -2
10 -1
10 0
10
If (A)
-1
10
0
10
1
10
2
10
3
10
Rs (Ohms)
Rs versus If
TYPICAL
UM9401/UM9402
UM9415
f = 100 MHz
0.0 0.2 0.4 0.6 0.8 1.0 1.2
Vf (V)
-5
10
-4
10
-3
10
-2
10
-1
10
0
10
If (A)
Vf versus If
TYPICAL
UM9401/UM9402
UM9415
CT VS FREQUENCY RP VS FREQUENCY
10 100 1000
f (MHz)
1
10
2
3
4
5
6
7
8
Ct (pF)
Ct versus f
TYPICAL
UM9401/UM9402
UM9415
Vr = 0 V
Vr = 0 V
Vr = 50 V
Vr = 50 V
1
10 2
10 3
10 4
10
f (MHz)
0
10
1
10
2
10
3
10
Rp (kOhms)
Rp versus f
TYPICAL
UM9401/UM9402 Vr = 0 V
UM9401/UM9402 Vr = 50 V
UM9415 Vr = 0 V
UM9415 Vr = 50 V
GRAPHS
UM9401 / UM9402 / UM9415
Microsemi
Microwave Products
75 Technology Drive, Lowell, MA. 01851, 978-442-5600, Fax: 978-937-3748
Page 4
TM ®
www.MICROSEMI.com
Copyright 2007
Rev: 2009-02-05
COMMERCIAL TWO W A Y RADIO
ANTENNA SWITCH DIO D ES
RoHS Compliant Versions Available
UM9415 POWER CURVE UM9401, 9402 POWER CURVE
UM9415 MAX POWER UM9401, 9402 MAX POWER
25 50 75 100 125 150 175 200
Lead Temperature ( C)
3000
10
100
1000
Maximum Transmitter Power (W)
MAXIMUM TRANSMITTER POWER
UM9415
If = 50 mA
If = 100 mA
If = 200 mA
If = 500 mA
If = 1 A
Zo = 50 Ohms, L = 1/2", SWR = INFINITE
o
25 50 75 100 125 150 175 200
Lead Temperature ( C)
1
10
100
1000
Maximum Transmitter Power (W)
MAXIMUM TRANSMITTER POWER
UM9401/UM9402
If = 10 mA
If = 20 mA
If = 50 mA
If = 100 mA
If = 200 mA
Zo = 50 Ohms, L = 1/2", SWR = INFINITE
o
G
GR
RA
AP
PH
HS
S
UM9401 / UM9402 / UM9415
Microsemi
Microwave Products
75 Technology Drive, Lowell, MA. 01851, 978-442-5600, Fax: 978-937-3748
Page 5
TM ®
www.MICROSEMI.com
Copyright 2007
Rev: 2009-02-05
COMMERCIAL TWO W A Y RADIO
ANTENNA SWITCH DIO D ES
RoHS Compliant Versions Available
“STYLE” UM9401B “STYLE” UM9415B
“STYLE” UM9401SM
“STYLE” UM9415SM
MECHANICAL
UM9401 / UM9402 / UM9415
Microsemi
Microwave Products
75 Technology Drive, Lowell, MA. 01851, 978-442-5600, Fax: 978-937-3748
Page 6
TM ®
www.MICROSEMI.com
Copyright 2007
Rev: 2009-02-05
COMMERCIAL TWO W A Y RADIO
ANTENNA SWITCH DIO D ES
RoHS Compliant Versions Available
“STYLE” UM9402
UM9401SM FOOTPRINT
UM9415SM FOOTPRINT
MECHANICAL
UM9401 / UM9402 / UM9415
Microsemi
Microwave Products
75 Technology Drive, Lowell, MA. 01851, 978-442-5600, Fax: 978-937-3748
Page 7
TM ®
www.MICROSEMI.com
Copyright 2007
Rev: 2009-02-05
COMMERCIAL TWO W A Y RADIO
ANTENNA SWITCH DIO D ES
RoHS Compliant Versions Available
Maximum Transmitter Power
The maximum CW transmitter power, PT(max), a PIN diode
antenna switch can handle depends on the diode
resistance, RS, power dissipation, PD, antennae SWR, σ,
and the nominal impedance, ZO. The expression is as
follows:
2
)( 21
D
OD
MAXT R
xZP
P [Watts]
Characteristic curves are shown in the data section
which gives both the maximum and typical diode
resistance, RS as a function of forward current. The
maximum power dissipation rating of the PIN diode
depends both on the length of the diode leads and the
temperature of the contacts to which the leads are
connected. A graph defining the maximum power
dissipation at various combinations of overall lead length
(L) and lead temperature (TL) is given in the data section.
From these curves and the above equation, the power
handling capability of the PIN diode may be computed for
a specific application.
Curves are also presented which show the maximum
transmitter power that an antenna
switch using UM9401s and UM9415s can safely handle
for various forward currents and lead temperatures.
These curves are based on a typical design condition of a
½ in. total overall lead length, 50 Ω line impedance, and a
totally mismatched antenna (σ = ∞). For the case of a
perfectly matched antenna, the maximum transmitter
power can be increased by a factor of 4.
Design Information
A circuit configuration for a two-way radio antenna
switch using PIN diodes consists of a diode placed in
series with the transmitter and a shunt diode placed a
quarter wavelength from the antenna in the direction of
the receiver as shown. For low frequency operation, the
quarter wave line may be simulated by lumped elements.
Typical performance of antenna
switches using PIN diodes forward biased at 100 mA is
less than 0.2 dB insertion loss and 30 dB isolation during
transmit; at zero bias the receive insertion loss is less
than 0.3 dB. This performance is achievable across a ±20
% bandwidth at center frequencies ranging from 10 to 500
MHz.
ANTENNA
ANTENNA
DC SUPPLY
D1
D2
LD1
D2
DC SUPPLY
/4
TRANSMITTER
TRANSMITTER
RECEIVER
RECEIVER
L = ZO / 2 fO (H)
C = 1/2 fO ZO (F)
L
CC
DESIGN
