DIGITRON SEMICONDUCTORS
2N489-2N494, A, B
NPN SILICON UNIJUNCTION TRANSISTOR
Silicon unijunction transistors are three-terminal device having a stable “N” type negative resistance characteristic over a wide
temperature range.
FEATURES
•
•
•
•
•
•
Stable operation over wide temperature range
Low leakage current
Low peak point current
Guaranteed minimum pulse voltage
Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number.
Available Non-RoHS (standard) or RoHS compliant (add PBF suffix).
MAXIMUM RATINGS
Rating
Total RMS Power Dissipation (Unstabilized)
Total RMS Power Dissipation (Stabilized)
RMS Emitter Current
Peak Emitter Current (T
J
= 150°C)
Emitter Reverse Voltage (T
J
= 150°C)
Operating Temperature Range
Operating Temperature Range (Stabilized)
Storage Temperature Range
Value
450mW
600mW
70mA
2A
60 V
-65° to +140°C
-65° to +175°C
-65° to +175°C
ELECTRICAL CHARACTERISTICS (
T
C
= 25°C unless otherwise noted)
Intrinsic
standoff ratio
(1)
Interbase
resistance
(2)
Modulated
interbase
current
Maximum
Emitter
saturation
voltage
I
E
= 50mA
V
BB
= 10V
V
E(SAT)
Volts
5
4
4
5
4
4
4
5
4.3
4.3
5
4.3
4.3
4.3
5
4.6
4.6
5
4.6
4.6
4.6
Emitter reverse current
T
J
=
150°C
V
B2E
=
10V
I
EB2O
µA
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
Peak point
current
Minimum
Valley point
current
Part number
V
RR
= 10V
V
BB
= 3V
I
R
= 50mA
V
BB
= 10V
I
B2(MOI)
mA
V
B2E
=
60V
I
EB2O
µA
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
V
B2E
=30V
I
EB2O
µA
-
-
0.2
-
-
0.2
0.02
-
-
0.2
-
-
0.2
0.02
-
-
0.2
-
-
0.2
0.02
V
BB
= 25V
R
B2
= 100Ω
V
BB
= 20V
I
V
mA
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Base one
peak pulse
voltage
R
BBO
ŋ
Min
2N489
2N489A
2N489B
2N490
2N490A
2N490B
2N490C
2N491
2N491A
2N491B
2N492
2N492A
2N492B
2N492C
2N493
2N493A
2N493B
2N494
2N494A
2N494B
2N494C
.51
.51
.51
.51
.51
.51
.51
.56
.56
.56
.56
.56
.56
.56
.62
.62
.62
.62
.62
.62
.62
Max
.62
.62
.62
.62
.62
.62
.62
.68
.68
.68
.68
.68
.68
.68
.75
.75
.75
.75
.75
.75
.75
Min
4.7
4.7
4.7
6.2
6.2
6.2
6.2
4.7
4.7
4.7
6.2
6.2
6.2
6.2
4.7
4.7
4.7
6.2
6.2
6.2
6.2
kΩ
Max
6.8
6.8
6.8
9.1
9.1
9.1
9.1
6.8
6.8
6.8
9.1
9.1
9.1
9.1
6.8
6.8
6.8
9.1
9.1
9.1
9.1
I
P
µA
12
12
6
12
12
6
2
12
12
6
12
12
6
2
12
12
6
12
12
6
2
V
OB1
Volts
-
3
3
-
3
3
3
-
3
3
-
3
3
3
-
3
3
-
3
3
3
Min
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
6.8
Max
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
22
144 Market Street
Kenilworth NJ 07033 USA
phone +1.908.245-7200
fax +1.908.245-0555
sales@digitroncorp.com
www.digitroncorp.com
Rev. 20121023
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