Ericsson PTB20078 Datasheet

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Description

PTB 20078

2.5 Watts, 1525–1660 MHz

INMARSAT RF Power Transistor

The 20078 is a class AB, NPN, common emitter RF power transistor
intended for 26 Vdc operation from 1525 to 1660 MHz. Rated at 2.5
watts minimum output power, it may be used for both CW and PEP
applications. Ion implantation, nitride surface passivation and gold
metallization are used to ensure excellent device reliability . 100% lot
traceability is standard.

Typical Output Pow er vs. Input Power

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

Output Power (Watts)

0.5

0.0

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Input Power (Watts)

VCC = 26 V
I

= 20 mA

CQ

f = 1.66 GHz

 2.5 Watts, 1525–1660 MHz
 Class AB Characteristics
 Gold Metallization
 Silicon Nitride Passivated
 Surface Mountable
 Available in Tape and Reel

20078

LOT CODE

Package 20227

Maximum Ratings

Parameter Symbol Value Unit

Collector-Emitter Voltage V
Collector-Base Voltage V
Emitter-Base Voltage (collector open) V
Collector Current (continuous) I
Total Device Dissipation at T

Above 25°C derate by 0.057 W/°C
Storage Temperature T

Thermal Resistance (T

9/28/98

flange

= 25°C P

flange

= 70°C) R

1

CER
CBO
EBO

C

D

stg

θJC

50 Vdc
50 Vdc

4.0 Vdc

0.5 Adc

10.0 Watts

150 °C

17.5 °C/W

PTB 20078

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Electrical Characteristics (100% Tested)

Characteristic Conditions Symbol Min Typ Max Units

Breakdown Voltage C to E VBE = 0 V, IC = 5 mA V(
Breakdown Voltage C to E IB = 0 A, IC = 10 mA, RBE = 22 Ω V(
Breakdown Voltage E to B IC = 0 A, IE = 5 mA V(
DC Current Gain VCE = 5 V, IC = 250 mA h

BR)CES
BR)CER
BR)EBO

FE

50 — — Volts
50 — — Volts

4 5 — Volts

20 40 — —

RF Specifications (100% Tested)

Characteristic Symbol Min Typ Max Units

Gain

(V
f = 1.525; 1.66 GHz)

Power Out at 1 dB Compression

(V
f = 1.525; 1.66 GHz)

Load Mismatch Tolerance

(V
f = 1.660 GHz—all phase angles at frequency of test)

= 26 Vdc, P

CC

= 26 Vdc, ICQ = 20 mA, P-1dB 2.5 3.5 — Watts

CC

= 26 Vdc, P

CC

= 1.0 W, ICQ = 20 mA, G

out

= 2.5 W, ICQ = 20 mA Ψ — — 5:1 —

out

pe

9 11.0 — dB

Impedance Data (data shown for fixed-tuned broadband circuit)

(V

= 26 Vdc, P

CC

= 2.5 W, ICQ = 20 mA)

out

Z Source Z Load

Frequency Z Source Z Load

GHz R jX R jX

1.525 16.9 0.5 12.9 23.8

1.593 13.7 2.3 12.9 25.9

1.660 11.3 4.6 12.9 27.7

Z0 = 50 Ω

2