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See Technical Specifications

2N2857

RF Transistor NPN 15V 40mA 500MHz 200mW Through Hole TO-72

Manufacturer:

Semicoa Semiconductors
Mfr.Part #:

2N2857
Datasheet:

2N2857 Datasheet (PDF)
Transistor Type:

NPN
Voltage - Collector Emitter Breakdown (Max):

15V
Frequency - Transition:

500MHz
Noise Figure (dB Typ @ f):

4.5dB @ 450MHz

Email: [email protected]

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Tel: +852 95804164

2N2857 General Description

The 2N2857 is a high-frequency NPN transistor designed to amplify RF signals and perform switching operations in RF and microwave applications. It belongs to a family of transistors specifically optimized for high-frequency performance.

Key Features

NPN Transistor: The 2N2857 is an NPN bipolar junction transistor (BJT). NPN transistors are commonly used for amplification and switching in electronic circuits.
High-Frequency Operation: This transistor is optimized for high-frequency applications, making it suitable for RF and microwave circuit designs.
Low Noise Figure: It often exhibits a low noise figure, which is important in RF applications to minimize signal distortion and noise.
High Gain: The 2N2857 transistor typically provides high voltage gain, making it useful in RF amplification circuits.
Compact TO-72 Package: It is typically available in a compact TO-72 metal can package, which facilitates easy integration into circuit designs.
Amplification and Oscillation: The 2N2857 is commonly used for amplifying RF signals and in RF oscillator circuits for generating high-frequency signals.

Application

Radio Receivers: It is used in RF amplifier stages of radio receivers to boost weak incoming signals.
Transmitter Circuits: In RF transmitter circuits, the transistor can amplify and transmit high-frequency signals.
Microwave Amplifiers: It finds application in microwave amplifiers used in radar systems and microwave communication equipment.
RF Oscillators: The 2N2857 can be used as an active component in RF oscillators, generating high-frequency signals.
Antenna Tuners: In antenna tuner circuits for impedance matching in RF systems.
Ham Radio Equipment: Used in amateur radio (ham radio) equipment for RF amplification.
Test and Measurement: In RF test and measurement equipment for signal generation and analysis.
Wireless Communication: In RF amplifiers and transceivers for wireless communication devices.

Specifications

Category	Discrete Semiconductor ProductsTransistorsBipolar (BJT)Bipolar RF Transistors	Series	-
Transistor Type	NPN	Voltage - Collector Emitter Breakdown (Max)	15V
Frequency - Transition	500MHz	Noise Figure (dB Typ @ f)	4.5dB @ 450MHz
Gain	12.5dB ~ 21dB @ 450MHz	Power - Max	200mW
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 3mA, 1V	Current - Collector (Ic) (Max)	40mA
Operating Temperature	-65°C ~ 200°C (TJ)	Mounting Type	Through Hole
feature-type	NPN	feature-material
feature-configuration	Single	feature-number-of-elements-per-chip	1
feature-maximum-collector-base-voltage-v	30	feature-maximum-collector-emitter-voltage-v	15
feature-maximum-emitter-base-voltage-v	3	feature-maximum-base-emitter-saturation-voltage-v	1@1mA@10mA
feature-maximum-dc-collector-current-a	0.04	feature-operational-bias-conditions	6V/1.5mA
feature-minimum-dc-current-gain	30@3mA@1V	feature-minimum-dc-current-gain-range	30 to 50
feature-maximum-junction-ambient-thermal-resistance	400°C/W	feature-maximum-junction-case-thermal-resistance
feature-typical-input-capacitance-pf		feature-maximum-collector-emitter-saturation-voltage-v	0.4@1mA@10mA
feature-typical-output-capacitance-pf		feature-maximum-power-dissipation-mw	200
feature-output-power-w		feature-typical-power-gain-db	12.5(Min)
feature-maximum-transition-frequency-mhz	1600(Typ)	feature-maximum-noise-figure-db	4.5(Typ)
feature-packaging		feature-rad-hard
feature-pin-count	4	feature-cecc-qualified	No
feature-esd-protection		feature-escc-qualified
feature-military	No	feature-aec-qualified	No
feature-auto-motive	No	feature-p-pap	No
feature-eccn-code	EAR99	feature-svhc-exceeds-threshold	No

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Ratings and Reviews

A**n 08/16/2023

Excellent service, arrived before estimated!, very good attention from the seller and very good quality of the products.

A**n 10/12/2021

Diodes working. Delivery 5 days.

M**n 10/10/2021

Good quality., working, 4056 controller chip. usb-c( connector (only vbus and gnd pin connected, as to be ssen in picture. To my opinion that could miss usb specifications) I would still recommend. Quality and price fit together.

L**n 09/25/2021

Fast delivery, good price