# A81 / SMA81 Cascadable Amplifier (20-250 MHz)

## Features

· High Reverse Isolation: >30 dB (typical)
· High Gain: 26 dB (typical)
· High Level Output: +17 dBm (typical)
· Low Noise: 2.6 dB (typical)

## Description

· Discrete hybrid RF amplifier utilizing thin film manufacturing for accuracy and reliability.
· 2-stage silicon bipolar feedback amplifier design for broadband frequency range.
· Incorporates an isolation transformer for high reverse isolation.
· Available in TO-8, Surface Mount, and SMA Connectorized packages (connectorized version not RoHS compliant).
· MIL-STD-883 environmental screening available.

## Ordering Information

Part Number	Package
A81	TO-8
SMA81	Surface Mount
CA81	SMA Connectorized

## Electrical Specifications (Z0 = 50Ω, VCC = +15 VDC)

Parameter	Units	25°C	0° to 50°C	-54° to +85°C*
Frequency	MHz	10-300	20-250	20-250
Small Signal Gain (min)	dB	25.5	24.5	24.0
Gain Flatness (max)	dB	±0.1	±0.5	±0.7
Reverse Isolation	dB	31
Noise Figure (max)	dB	3.0	3.5	4.0
Power Output @ 1 dB comp. (min)	dBm	17.0	16.0	15.5
IP3	dBm	+28
IP2	dBm	+35
Second Order Harmonic IP	dBm	+41
VSWR Input / Output (max)		1.5:1 / 1.5:1	1.9:1 / 1.9:1	2.0:1 / 2.0:1
DC Current @ 15 Volts (max)	mA	33	37	39

## Absolute Maximum Ratings

· Storage Temperature: -62°C to +125°C
· Case Temperature: 125°C
· DC Voltage: +17 V
· Continuous Input Power: +10 dBm
· Short Term Input Power (1 minute max): 50 mW
· Peak Power (3 µsec max): 0.5 W

## Thermal Data

· Thermal Resistance θjc: 184°C/W
· Transistor Power Dissipation Pd: 0.155 W
· Junction Temperature Rise Above Case Tjc: 28°C

## Weights

· TO-8: 1 gram (0.04 oz) max
· Surface Mount: 1 gram (0.04 oz) max
· SMA Connectorized: 19 grams (0.67 oz) max

*Over temperature performance limits for part number CA81, guaranteed from 0°C to +50°C only.