DIGITRON SEMICONDUCTORS

144 Market Street

Kenilworth NJ 07033 USA

phone +1.908.245-7200

2N4870-2N4871

PN UNIJUNCTION TRANSISTORS

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

300

mW

RMS emitter current

50

mA

1.5

Amp

Emitter reverse voltage

30

Volts

Interbase voltage †

35

Volts

Operating junction temperature range

-55 to 125

°C

Storage temperature range

-55 to 150

°C

Note 1: Derate 3.04mW/°C increase in ambient temperature.

Note 2: Duty cycle ≤ 1%. PRR = 10PPS.

Characteristic

Symbol

Min

Typ

Max

Unit

Intrinsic standoff ratio

2N4870

2N4871

η

0.56

0.70

-

-

0.75

0.85

-

Interbase resistance

4.0

6.0

9.1

kohms

Interbase resistance temperature coefficient

0.1

-

0.9

%/°C

Emitter saturation voltage

-

2.5

-

Volts

Modulated interbase current

-

15

-

mA

Emitter reverse current

-

0.005

1.0

µA

Peak point emitter current

-

1.0

5.0

µA

Valley point current

2N4870

2N4871

2.0

4.0

5.0

7.0

-

-

mA

Base-one peak pulse voltage

2N4870

2N4871

3.0

5.0

6.0

8.0

-

-

Volts

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.

sales@digitroncorp.com

fax +1.908.245-0555

www.digitroncorp.com

Rev. 20120705