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RF & MICROWAVE DISCRETE
LOW POWER TRANSISTORS
MRF581
MRF581G
MRF581A
MRF581AG
*G Denotes RoHS Compliant, Pb free Terminal Finish
Features
Low Noise - 2.5 dB @ 500 MHZ
Gain at Optimum Noise Figure = 15.5 dB @ 500 MHz
Ftau - 5.0 GHz @ 10v, 75mA
Cost Effective MacroX Package
Macro X
DESCRIPTION: Designed for high current, low power, low noise, amplifiers up to 1.0 GHz.
ABSOLUTE MAXIMUM RATINGS (Tcase = 25°C)
Symbol
Parameter
VCEO
Collector-Emitter Voltage
VCBO
Collector-Base Voltage
VEBO
Emitter-Base Voltage
IC Collector Current
MRF581 MRF581A
18 15
30
2.5
200
Unit
Vdc
Vdc
Vdc
mA
Thermal Data
P
D
P
D
Tstg
Total Device Dissipation @ TC = 50ºC
Derate above 50ºC
Total Device Dissipation @ TC = 25ºC
Derate above 25ºC
Storage Junction Temperature Range
TJmax
Maximum Junction Temperature
Revision A- December 2008
2.5
25
1.25
10
-65 to +150
150
Microsemi reserves the right to change, without notice, the specifications and information contained herein
Visit our website at www.microsemi.com or contact our factory direct.
Watts
mW/ ºC
Watts
mW/ ºC
ºC
ºC

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MRF581
MRF581G
MRF581A
MRF581AG
ELECTRICAL SPECIFICATIONS (Tcase = 25°C)
STATIC
(off)
Symbol
BVCEO
BVCBO
BVEBO
ICBO
IEBO
(on)
HFE
Test Conditions
Collector-Emitter Breakdown Voltage
(IC = 5.0 mAdc, IB = 0)
Collector-Base Breakdown Voltage
(IC = 1.0 mAdc, IE = 0)
Emitter-Base Breakdown Voltage
(IE = 0.1 mAdc, IC = 0)
Collector Cutoff Current
(VCB = 15 Vdc, VBE = 0 Vdc)
Emitter Cutoff Current
(Vbe = 2.5 Vdc)
DC Current Gain
(IC = 50 mAdc, VCE = 5.0 Vdc)
MRF581
MRF581A
Min.
18
15
30
2.5
-
-
MRF581
MRF581A
50
90
Value
Typ.
-
-
-
-
-
-
Max.
-
-
-
0.1
0.1
200
250
Unit
Vdc
Vdc
Vdc
mA
mA
-
DYNAMIC
Symbol
COB
Ftau
Test Conditions
Output Capacitance
(VCB = 10 Vdc, IE = 0, f = 1.0 MHz)
Current-Gain Bandwidth Product
(IC = 75 mAdc, VCE = 10 Vdc, f = 1.0 GHz)
Min.
-
-
Value
Typ.
2.0
5.0
Max.
3.0
-
Unit
pF
GHz
Microsemi reserves the right to change, without notice, the specifications and information contained herein
Visit our website at www.microsemi.com or contact our factory direct.

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FUNCTIONAL
Symbol
Test Conditions
NF
G
NF
G
U max
MSG
|S21|2
Noise Figure (50ohms)
(IC = 50 mAdc, VCE = 10 Vdc, f = 0.5 GHz)
Power Gain @ NFmin
(IC = 50 mAdc, VCE = 10 Vdc, f = 0.5 GHz)
Maximum Unilateral Gain (1)
IC = 50 mAdc, VCE = 10 Vdc, f = 500 MHz
Maximum Stable Gain
IC = 50 mAdc, VCE = 10 Vdc, f = 500 MHz
Insertion Gain
IC = 50 mAdc, VCE = 10 Vdc, f = 500 MHz
MRF581
MRF581G
MRF581A
MRF581AG
Min.
-
13
-
-
14
Value
Typ.
3.0
15.5
17.8
20
15
Max.
3.5
-
-
-
Unit
dB
dB
dB
dB
dB
Table 1. Common Emitter S-Parameters, @ VCE = 10 V, IC = 50 mA
f
(MHz)
100
200
300
400
500
600
700
800
900
1000
S11
|S11|
.610
.659
.671
.675
.677
.678
.677
.679
.678
.682
∠φ
-137
-161
-171
-178
176
172
168
184
160
156
S21
|S21|
23.8
13.2
9.0
6.8
5.5
4.6
4.0
3.5
3.1
2.8
∠φ
116
98
89
83
77
72
68
64
60
56
S12
|S12|
.026
.033
.040
.047
.055
.064
.073
.082
.092
.102
∠φ
46
47
51
55
58
61
62
63
64
65
S22
|S22|
.522
.351
.304
.292
.293
.299
.306
.314
.322
.311
∠φ
-78
-106
-120
-128
-132
-134
-135
-136
-138
-139
Microsemi reserves the right to change, without notice, the specifications and information contained herein
Visit our website at www.microsemi.com or contact our factory direct.

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MRF581
MRF581G
MRF581A
MRF581AG
C1, C4, C5, C6, C8, C9 — 1000 pF, Chip Capacitor
C7, C10 — 10 µF, Tantalum Capacitor
RFC — VK–200, Ferroxcube
TL1, TL7, TL8 — Microstrip 0.162, x 0.600,
TL3 — Microstrip 0.162, x 0.800,
TL5 — Microstrip 0.120, x 0.440,
TL9, TL10 — Microstrip 0.025, x 4.250,
Board Material — 0.0625, Thick Glass Teflon ε r = 2.55
C2, C3 — 1.0–10 pF, Johanson Capacitor
R1 — 1.0 kRes.
FB — Ferrite Bead, Ferroxcube, 56–590–65/3B
TL2 — Microstrip 0.162, x 1.000,
TL4 — Microstrip 0.162, x 0.440,
TL6 — Microstrip 0.120, x 1.160,
Figure 1. Minimum Noise Figure and Gain @ Minimum Noise Figure.
Microsemi reserves the right to change, without notice, the specifications and information contained herein
Visit our website at www.microsemi.com or contact our factory direct.

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MRF581
MRF581G
MRF581A
MRF581AG
RF Low Power PA, LNA, and General Purpose Discrete Selector Guide
SO-8
TO-39
POWER MACRO
POWER MACRO
TO-39
TO-39
TO-72
MRF4427, R2
2N4427
MRF553
MRF553T
MRF607
2N6255
2N5179
NPN 175 0.15 18 60 12 20 400
NPN 175 1 10 50 12 20 400
NPN 175 1.5 11.5 60 12.5 16 500
NPN 175 1.5 11.5 50 12.5 16 500
NPN 175 1.75 11.5 50 12.5 16 330
NPN 175 3 7.8 50 12.5 18 1000
NPN 200 20 6 12 50
MACRO X
MRF559
NPN 512 0.5 10 65 7.5 16 150
MACRO X
MRF559
NPN 512 0.5 13 60 12.5 16 150
TO-39
2N3866A NPN 400 1 10 45 28 30 400
SO-8
MRF3866, R1, R2 NPN 400 1 10 45 28 30 400
POWER MACRO
MRF555
NPN 470 1.5 11 50 12.5 16 400
POWER MACRO MRF555T NPN 470 1.5 11 50 12.5 16 400
MACRO X
MRF559
NPN 870 0.5 6.5 70 7.5 16 150
MACRO X
MRF559
NPN 870 0.5 9.5 65 12.5 16 150
SO-8
MRF8372,R1,R2 NPN 870 0.75 8 55 12.5 16 200
POWER MACRO
MRF557
NPN 870 1.5 8 55 12.5 16 400
POWER MACRO MRF557T NPN 870 1.5 8 55 12.5 16 400
RF (Low Power PA / General Purpose) Selection Guide
Low Cost RF Plastic Package Options
1
4
3
2
TO-39
TO-39
SO-8
TO-72
TO-72
TO-39
2N5109
NPN 200 3 10 15
MRF5943C NPN 200 3.4 30 15
MRF5943, R1, R2 NPN 200 3.4 30 15
2N5179
NPN 200 4.5 1.5 6
2N2857
NPN 300 5.5 50 6
MRF517
NPN 300 7.5 50 15
12 1200 3.5 20 400
11.4 1000
30 400
15 1300
30 400
17 900 1 12 50
13 1600 1 15 40
5.5 4600 3 25 150
TO-72
MRF904
NPN 450 1.5 5 6
11 4000 1 15 30
TO-72
2N6304
NPN 450 5 2 5
14 1400 1 15 50
MACRO T
BFR91
NPN 500 1.9 2 5 11 16.5 5000 1 12 35
MACRO T
BFR96
NPN 500 2 10 10
14.5 500 2.6 15 100
SO-8 MRF5812, R1, R2 NPN 500 2 50 10 15.5 17.8 5000
15 200
MACRO X MRF581A NPN 500 2 50 10 14 15 5000
15 200
Macro
BFR90
NPN 500 2.4 2 10 15 18 5000 1 15 30
TO-72
BFY90
NPN 500 2.5 2 5
20 1300
15 50
TO-72
MRF914
NPN 500 2.5 5 10
15 4500
12 40
MACRO X
MRF581
NPN 500 2.5 50 10 15 17.8 5000
16 200
TO-39
MRF586
NPN 500 3 90 15 11 14.5 4500 2.2 17 200
MACRO X
MACRO X
MACRO T
MACRO T
MRF951
MRF571
BFR91
BFR90
NPN 1000 1.3 5 6 14 17 8000 0.45 10 100
NPN 1000 1.5 10 6 10
8000 1 10 70
NPN 1000 2.5 2 5 8 11 5000 1 12 35
NPN 1000 3 2 10 10 12.5 5000 1 15 30
TO-39
TO-39
MRF545
MRF544
PNP
NPN
14 1400 2 70 400
13.5 1500
70 400
RF (LNA / General Purpose) Selection Guide
1
4
3
2
85
14
Macro T
Macro X
Power
SO-8
Microsemi reserves the right to change, without notice, the specifications and information contained herein
Visit our website at www.microsemi.com or contact our factory direct.