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2N4870

The 2N4870 is a silicon PN unijunction transistor in a TO-92 package. It features an intrinsic standoff ratio of 0.56 to 0.75 and maximum emitter reverse voltage of 30V.

✓ Total Stock: 325 pcs

2N4870 Available from 1 distributor

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✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Components Technology Group, Inc. ✓ Non-Authorised Inventory information	325 pcs On Request	325 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request

2N4870 Specifications Quick View

Most important parameters for selection – full specs in datasheet.

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Category	Transistors - Bipolar (BJT) - Single
Manufacturer Name	NTE Electronics
Mounting Type	Through Hole
Operating Temperature	-65°C to 125°C
Power	300 mW
Storage Temperature	-65.0°C ~ 150.0°C
Supplier Device Package	TO-92
Transistor Type	PNP

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2N4870 Description

Short technical summary and product information.

The 2N4870 is a silicon PN unijunction transistor designed for oscillator, triggering and timing applications. It is manufactured by NTE Electronics and housed in a through-hole TO-92 package (TO-226-3, TO-92-3).

Key electrical characteristics include a maximum emitter reverse voltage of 30 V, interbase voltage of 35 V, RMS emitter current of 1.5 A, and RMS power dissipation of 300 mW. The intrinsic standoff ratio ranges from 0.56 to 0.75 at VB2B1=10V, and interbase resistance from 4.0 to 9.1 kΩ at VB2B1=3.0V. The device operates over a junction temperature range of -65°C to 125°C and can be stored from -65°C to 150°C.

The 2N4870 is suitable for relaxation oscillators, timing circuits, and triggering SCRs. Its through-hole mounting and TO-92 package allow easy integration in breadboard and PCB designs.

2N4870 Quick Information

Product Type: Unijunction Transistor

Canonical Name: Silicon PN Unijunction Transistor

Subcategory: Unijunction Transistors

2N4870 Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

2N4870 Features

Silicon PN unijunction transistor.
Intrinsic standoff ratio 0.56 to 0.75.
Maximum emitter reverse voltage 30V.
RMS emitter current 1.5A.
Through-hole TO-92 package.

2N4870 Applications

Used in relaxation oscillator circuits.
Ideal for timing and delay circuits.
Triggers SCRs and thyristors.

2N4870 FAQs

6 frequently asked questions generated from this part’s specifications.

What is the maximum emitter reverse voltage for the 2N4870?

30 V

What package type does the 2N4870 use?

TO-226-3, TO-92-3 (TO-226AA) with a through-hole mounting. The supplier device package is TO-92.

What is the operating temperature range of the 2N4870?

Operating junction temperature: -65°C to 125°C. Storage temperature: -65°C to 150°C.

What is the intrinsic standoff ratio of the 2N4870?

0.56 to 0.75 at VB2B1=10V.

What is the interbase resistance of the 2N4870?

4.0 to 9.1 kΩ at VB2B1=3.0V.

Is the 2N4870 RoHS compliant?

RoHS3 compliant (unverified).

2N4870 Alternate Parts

Same form/fit/function or matching attribute configuration across different manufacturers.

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2N4871

Central Semiconductor Corp

The 2N4871 is a silicon PN unijunction transistor from Central Semiconductor, designed for oscillator, triggering, and timing applications. It comes in a TO-92 through-hole package.

View Part