DIGITRON SEMICONDUCTORS
2N4870-2N4871
MAXIMUM RATINGS
Rating
RMS power dissipation
(1)
RMS emitter current
Peak pulse emitter current
(2)
Emitter reverse voltage
Interbase voltage †
Operating junction temperature range
Storage temperature range
Note 1: Derate 3.04mW/°C increase in ambient temperature.
Note 2: Duty cycle
≤
1%. PRR = 10PPS.
† Base upon power dissipation at T
A
= 25°C.
PN UNIJUNCTION TRANSISTORS
Symbol
P
D
I
e
i
e
V
B2E
V
B2B1
T
J
T
stg
Value
300
50
1.5
30
35
-55 to 125
-55 to 150
Unit
mW
mA
Amp
Volts
Volts
°C
°C
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
Characteristic
Intrinsic standoff ratio
(V
B2B1
= 10V)
(1)
Interbase resistance
(V
B2B1
= 3.0V, I
E
= 0)
Interbase resistance temperature coefficient
(V
B2B1
= 3.0v, I
E
= 0, T
A
= -65° to 125°C
Emitter saturation voltage
(V
B2B1
= 10V, I
E
= 50mA)
(2)
Modulated interbase current
(V
B2B1
= 10V, I
E
= 50mA)
Emitter reverse current
(V
B2E
= 30V, I
B1
= 0)
Peak point emitter current
(V
B2B1
= 25V)
Valley point current
(V
B2B1
= 20V, R
B2
= 100ohms)
(2)
Base-one peak pulse voltage
2N4870
2N4871
V
OB1
3.0
5.0
6.0
8.0
-
-
Volts
2N4870
2N4871
2N4870
2N4871
Symbol
η
Min
0.56
0.70
4.0
0.1
-
-
-
-
2.0
4.0
Typ
-
-
6.0
-
2.5
15
0.005
1.0
5.0
7.0
Max
0.75
0.85
9.1
0.9
-
-
1.0
5.0
-
-
Unit
-
R
BB
αR
BB
V
EB1(sat)
I
B2(mod)
I
EB20
I
P
kohms
%/°C
Volts
mA
µA
µA
I
V
mA
Note 1: Intrinsic standoff ration: VP =
η
VB2B1+ VF, where VF is about 0.49V at 25°C @ IF = 10µA and decreases with temperature at about 2.5mV/°C. Components R1, C1, and
the UJT form a relaxation oscillator; the remaining circuitry serves as a peak –voltage detector. The forward drop of diode D1 compensates for VR. To use, the “cal” button is
pushed and R3 is adjusted to make the current meter, M1, read full scale. When the “cal” button is released, the value of
η
is read directly from the meter, if full scale on the meter
reads 1.0.
Note 2: Use pulse techniques: PW
≈
300µs duty cycle
≤
2% to avoid internal heating due to interbase modulation which may result in erroneous readings.
Available Non-RoHS (standard) or RoHS compliant (add PBF suffix).
Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number.
144 Market Street
Kenilworth NJ 07033 USA
phone +1.908.245-7200
fax +1.908.245-0555
sales@digitroncorp.com
www.digitroncorp.com
Rev. 20120705
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