2N4870 2N4871.aspx?ext=

2N4870, 2N4871
SILICON CONTROLLED RECTIFIERS
High-reliability discrete products
and engineering services since 1977
FEATURES


Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number.
Available as non-RoHS (Sn/Pb plating), standard, and as RoHS by adding “-PBF” suffix.
MAXIMUM RATINGS
Rating
RMS power dissipation(1)
RMS emitter current
Peak pulse emitter current
(2)
Symbol
Value
Unit
PD
300
mW
Ie
50
mA
ie
1.5
Amp
Emitter reverse voltage
VB2E
30
Volts
Interbase voltage †
VB2B1
35
Volts
Operating junction temperature range
TJ
-55 to 125
°C
Storage temperature range
Tstg
-55 to 150
°C
Note 1: Derate 3.04mW/°C increase in ambient temperature.
Note 2: Duty cycle ≤ 1%. PRR = 10PPS.
A = 25°C.
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise specified)
Characteristic
Intrinsic standoff ratio
(VB2B1 = 10V)(1)
2N4870
2N4871
Symbol
Min
Typ
Max
Unit
η
0.56
0.70
-
0.75
0.85
-
4.0
6.0
9.1
0.1
-
0.9
-
2.5
-
-
15
-
-
0.005
1.0
-
1.0
5.0
Interbase resistance
(VB2B1 = 3.0V, IE = 0)
RBB
Interbase resistance temperature coefficient
(VB2B1 = 3.0v, IE = 0, TA = -65° to 125°C
αRBB
Emitter saturation voltage
(VB2B1 = 10V, IE = 50mA)(2)
VEB1(sat)
Modulated interbase current
(VB2B1 = 10V, IE = 50mA)
IB2(mod)
Emitter reverse current
(VB2E = 30V, IB1 = 0)
IEB20
Peak point emitter current
(VB2B1 = 25V)
Valley point current
(VB2B1 = 20V, RB2 = 100ohms)(2)
IP
kohms
%/°C
Volts
mA
µA
µA
2N4870
2N4871
IV
2.0
4.0
5.0
7.0
-
mA
2N4870
2N4871
VOB1
3.0
5.0
6.0
8.0
-
Volts
Base-one peak pulse voltage
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.
Rev. 20120705
High-reliability discrete products
and engineering services since 1977
2N4870, 2N4871
SILICON CONTROLLED RECTIFIERS
MECHANICAL CHARACTERISTICS
Case:
TO-92
Marking:
Body painted, alpha-numeric
Pin out:
See below
Rev. 20120705
High-reliability discrete products
and engineering services since 1977
2N4870, 2N4871
SILICON CONTROLLED RECTIFIERS
Rev. 20120705
High-reliability discrete products
and engineering services since 1977
2N4870, 2N4871
SILICON CONTROLLED RECTIFIERS
Rev. 20120705
High-reliability discrete products
and engineering services since 1977
2N4870, 2N4871
SILICON CONTROLLED RECTIFIERS
Rev. 20120705