U309
N-CHANNEL JFET
Linear Systems replaces discontinued Siliconix U309
The U309 is a high frequency n-channel JFET offering a
wide range and low noise performance. The
hermetically sealed TO-18 package is well suited for
high reliability and harsh environment applications.
(See Packaging Information).
FEATURES
DIRECT REPLACEMENT FOR SILICONIX U309
OUTSTANDING HIGH FREQUENCY GAIN
LOW HIGH FREQUENCY NOISE
ABSOLUTE MAXIMUM RATINGS @ 25°C
1
G
pg
= 11.5dB
NF = 2.7dB
Maximum Temperatures
Storage Temperature
‐55°C to +150°C
High Power Low Noise gain
Operating Junction Temperature
‐55°C to +135°C
Dynamic Range greater than 100dB
Maximum Power Dissipation
Easily matched to 75Ω input
Continuous Power Dissipation
500mW
U309 Applications:
MAXIMUM CURRENT
Gate Current
10mA
UHV / VHF Amplifiers
MAXIMUM VOLTAGES
Mixers
Gate to Drain Voltage or Gate to Source Voltage
‐25V
Oscillators
U309 ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
CHARACTERISTIC
MIN
TYP.
MAX
UNIT
CONDITIONS
BV
GSS
Gate to Source Breakdown Voltage
‐25
‐‐
‐‐
V
V
DS
= 0V, I
G
= ‐1µA
V
GS(F)
Gate to Source Forward Voltage
0.7
‐‐
1
V
DS
= 0V, I
G
= 10mA
V
GS(off)
Gate to Source Cutoff Voltage
‐1
‐‐
‐4
V
DS
= 10V, I
D
= 1nA
2
I
DSS
Drain to Source Saturation Current
12
‐‐
30
mA
V
DS
= 10V, V
GS
= 0V
I
G
Gate Operating Current (Note 3)
‐‐
‐15
‐‐
pA
V
DG
= 9V, I
D
= 10mA
r
DS(on)
U309 DYNAMIC ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
g
fs
g
os
C
iss
C
rss
e
n
Equivalent Noise Voltage
6
‐‐
‐‐
nV/√Hz
V
DS
= 10V, I
D
= 10mA , f = 100Hz
U309 HIGH FREQUENCY CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
CHARACTERISTIC
MIN
TYP
MAX
UNIT
CONDITIONS
U309 Benefits:
Noise Figure
Power Gain
3
Forward Transconductance
Output Conductance
f = 105MHz
f = 450MHz
f = 105MHz
f = 450MHz
f = 105MHz
f = 450MHz
f = 105MHz
f = 450MHz
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
1.5
2.7
16
11.5
14
13
0.16
0.55
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
dB
dB
mS
Available Packages:
U309 in TO-18
U309 in bare die.
TO-18 (Bottom View)
NF
G
pg
g
fg
g
og
V
DS
= 10V, I
D
= 10mA
Note 1 ‐ Absolute maximum ratings are limiting values above which U309 serviceability may be impaired.
Note 2 ‐ Pulse test : PW ≤ 300µs, Duty Cycle ≤ 3%
Note 3 ‐ Measured at optimum input noise match
Micross Components
Europe
Tel: +44 1603 788967
Email:
chipcomponents@micross.com
Web:
http://www.micross.com/distribution
Please contact Micross for full
package and die dimensions
Information furnished by Linear Integrated Systems and Micross Components is believed to be accurate and reliable. However, no responsibility is assumed for its use; nor for any infringement of patents or
other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Linear Integrated Systems.
Micross Components Ltd, United Kingdom, Tel: +44 1603 788967, Fax: +44 1603788920, Email:
chipcomponents@micross.com
Web:
www.micross.com/distribution.aspx
MICROSS [ MICROSS COMPONENTS ]
