2N4870
2N4871
SILICON
PN UNIJUNCTION TRANSISTORS
DESCRIPTION:
The CENTRAL SEMICONDUCTOR 2N4870 and
2N4871 are silicon PN unijunction transistors designed
for oscillator, triggering and timing applications.
MARKING: FULL PART NUMBER
TO-92 CASE
MAXIMUM RATINGS: (TA=25°C) SYMBOL UNITS
Emitter Reverse Voltage VB2E 30 V
Interbase Voltage VB2B1 35 V
RMS Emitter Current Ie 1.5 A
Peak Emitter Current (Duty Cycle ≤1%, PRR=10pps) ie 1.0 A
RMS Power Dissipation PD 300 mW
Operating Junction Temperature TJ -65 to +125 °C
Storage Temperature Tstg -65 to +150 °C
ELECTRICAL CHARACTERISTICS: (TA=25°C) 2N4870 2N4871
SYMBOL TEST CONDITIONS MIN MAX MIN MAX UNITS
V
B2B1=10V 0.56 0.75 0.70 0.85
RBB V
B2B1=3.0V 4.0 9.1 4.0 9.1 kΩ
IEB2O V
B2E=30V - 1.0 - 1.0 μA
IV V
B2B1=20V, RB2=100Ω 2.0 - 4.0 - mA
IP V
B2B1=25V - 5.0 - 5.0 μA
VOB1 V
1=20V 3.0 - 5.0 - V
R1 (23-April 2013)
www.centralsemi.com
2N4870
2N4871
SILICON
PN UNIJUNCTION TRANSISTORS
LEAD CODE:
1) Base 1
2) Emitter
3) Base 2
MARKING:
FULL PART NUMBER
TO-92 CASE - MECHANICAL OUTLINE
www.centralsemi.com
R1 (23-April 2013)
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which is part of Central’s Standard Terms and Conditions of sale, visit: www.centralsemi.com/terms
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(001)
REQUESTING PRODUCT PLATING
1. If requesting Tin/Lead plated devices, add the suffix “ TIN/LEAD” to the part number when
ordering (example: 2N2222A TIN/LEAD).
2. If requesting Lead (Pb) Free plated devices, add the suffix “ PBFREE” to the part number
when ordering (example: 2N2222A PBFREE).
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PDN01115
12/12/18
Stock Only
http://www.centralsemi.com Stock Only
Please be advised that Central Semiconductor must immediately discontinue the product(s) listed in the attached PDN notice. We are unable
to accept any further orders for these products unless_____ we have available inventory on hand.
You may have purchased one or more of the products listed. Please do not hesitate to contact your local Central Semiconductor sales
representative with any questions or needs you may have. Central regrets any inconvenience this may cause.
Sincerely,
Central Semiconductor Corp.
PDN01115
12/12/18
Stock Only
http://www.centralsemi.com Stock Only
Summary:The 2N4870 and 2N4871 unijunction transistors are discontinued and now classified as End of Life (EOL).
Although Central Semiconductor Corp. makes every effort to continue to produce devices that have been proclaimed EOL (End of Life) by
other manufacturers, it is an accepted industry practice to discontinue certain devices when customer demand falls below a minimum level of
sustainability. Accordingly, the following product(s) have been transitioned to End of Life status as part of Central's ongoing Product
Management Process. Any replacement products are noted below. The effective date for placing last purchase orders will be six (6) months
from the date of this notice and twelve (12) months from the notice date for final shipments, and minimum order quantities may apply.
The last purchase and shipment dates may be extended if inventory is available.
Central Part Number Replacement
2N4870 N/A, Stock Only
2N4871 N/A, Stock Only
Central would be happy to assist you by providing additional information or technical data to help locate an alternate source if we
have no replacement available. Please email your requests to engineering@centralsemi.com.
