BLA0912-250
Avionics LDMOS transistor
Rev. 4 — 1 September
Product data sheet
1. Product profile
1.1 General description
Silicon N-channel enhancement mode LDMOS transistor encapsulated in a 2-lead
SOT502A flange package with a ceramic cap. The common source is connected to the
mounting flange.
Table 1.
Test information
Typical RF performance measured in common source class-AB test circuit at P
L
= 250 W and 960 MHz to 1215 MHz
frequency band. T
h
= 25
C; Z
th(j-h)
= 0.15 K/W; unless otherwise specified.
Mode of operation
all modes
TCAS
Mode-S
JTIDS
CAUTION
This device is sensitive to ElectroStatic Discharge (ESD). Therefore care should be taken
during transport and handling.
f
(MHz)
960 to 1215
1030 to 1090
1030 to 1090
1030 to 1090
960 to 1215
t
p
(s)
100
32
128
340
%
10
2
1
V
DS
P
L
(V)
36
36
36
36
G
p
G
p
D
50
50
50
50
45
P
droop(pulse)
0.1
0
0.1
0.2
0.2
t
r
25
25
25
25
25
t
f
6
6
6
6
6
Z
th(j-h)
ins(rel)
(deg)
5
5
5
5
5
0.18
0.07
0.15
0.20
0.45
(W) (dB) (dB) (%) (dB)
250 13.5 0.8
250 14.0 0.8
250 13.5 0.8
250 13.5 0.8
200 13.0 1.2
(ns) (ns) (K/W)
0.1 36
3300 22
1.2 Features and benefits
High power gain
Easy power control
Excellent ruggedness
Source on mounting base eliminates DC isolators, reducing common mode
inductance.
1.3 Applications
Avionics transmitter applications in the 960 MHz to 1215 MHz frequency range such
as Mode-S, TCAS and JTIDS, DME or TACAN.
BLA0912-250
Avionics LDMOS transistor
2. Pinning information
Table 2.
Pin
1
2
3
Pinning
Description
drain
gate
source
[1]
Simplified outline
1
3
2
Graphic symbol
1
2
3
sym039
[1]
Connected to flange.
3. Ordering information
Table 3.
Ordering information
Package
Name
BLA0912-250
-
Description
flanged LDMOST ceramic package;
2 mounting holes; 2 leads
Version
SOT502A
Type number
4. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
V
DS
V
GS
P
tot
T
stg
T
j
Parameter
drain-source voltage
gate-source voltage
total power dissipation
storage temperature
junction temperature
T
h
25
C;
t
p
= 50
s;
= 2 %
Conditions
Min
-
-
-
65
-
Max
75
22
700
+150
200
Unit
V
V
W
C
C
5. Thermal characteristics
Table 5.
Symbol
Z
th(j-h)
[1]
Thermal characteristics
Parameter
transient thermal impedance from junction to
heatsink
Conditions
T
h
= 25
C
[1]
Typ
0.18
Unit
K/W
Thermal resistance is determined under RF operating conditions; t
p
= 100
s,
= 10 %.
BLA0912-250#4
All information provided in this document is subject to legal disclaimers.
© Ampleon The Netherlands B.V. 2015. All rights reserved.
Product data sheet
Rev. 4 — 1 September
2 of 13
BLA0912-250
Avionics LDMOS transistor
6. Characteristics
Table 6.
DC characteristics
T
j
= 25
C; per section unless otherwise specified.
Symbol Parameter
V
GS(th)
I
DSS
I
DSX
I
GSS
g
fs
R
DS(on)
gate-source threshold voltage
drain leakage current
drain cut-off current
gate leakage current
forward transconductance
Conditions
V
DS
= 10 V; I
D
= 300 mA
V
GS
= 0 V; V
DS
= 36 V
V
GS
= V
GSth
+ 9 V;
V
DS
= 10 V
V
GS
= 20 V; V
DS
= 0 V
V
DS
= 10 V; I
D
= 10 A
Min
75
4
-
45
-
-
-
Typ
-
-
-
-
-
9
60
Max Unit
-
5
1
-
1
-
-
V
V
A
A
A
S
m
V
(BR)DSS
drain-source breakdown voltage V
GS
= 0 V; I
D
= 3 mA
drain-source on-state resistance V
GS
= 9 V; I
D
= 10 A
Table 7.
RF characteristics
RF performance in common source class-AB circuit; T
h
= 25
C; Z
th
= 0.15 K/W; unless otherwise
specified.
Symbol
V
DS
f
P
L
G
p
D
Z
th(j-h)
T
h
P
droop(pulse)
resp(sp)
t
r
t
f
Parameter
drain-source voltage
frequency
output power
power gain
drain efficiency
transient thermal impedance
from junction to heatsink
heatsink temperature
pulse droop power
spurious response
rise time
fall time
t
p
= 100
s;
= 10 %
VSWR
load
= 2 : 1
t
p
= 100
s;
= 10 %
P
L
= 250 W
t
p
= 100
s;
= 10 %
t
p
= 100
s;
= 10 %
Conditions
Min
-
960
250
12
40
-
55
-
-
-
-
Typ
-
-
-
13
50
-
-
0.1
-
25
6
0.2
+70
0.5
60
50
25
Max
36
1215
Unit
V
MHz
W
dB
%
K/W
C
dB
dBc
ns
ns
6.1 Ruggedness in class-AB operation
The BLA0912-250 is capable of withstanding a load mismatch corresponding to
VSWR = 5 : 1 through all phases under the following conditions: V
DS
= 36 V;
f = 960 MHz to 1215 MHz at rated load power.
BLA0912-250#4
All information provided in this document is subject to legal disclaimers.
© Ampleon The Netherlands B.V. 2015. All rights reserved.
Product data sheet
Rev. 4 — 1 September
3 of 13
BLA0912-250
Avionics LDMOS transistor
7. Application information
7.1 Impedance information
Table 8.
Typical impedance
Typical values per section unless otherwise specified.
f
MHz
960
1030
1090
1140
1215
Z
S
0.89
j1.70
1.37
j1.23
2.09
j1.27
2.40
j1.97
1.51
j2.61
Z
L
1.53
j1.13
1.47
j0.99
1.38
j0.85
1.30
j0.71
1.17
j0.47
drain
Z
L
gate
Z
S
001aaf059
Fig 1.
Definition of transistor impedance
7.2 Application circuit
L2
L1
C1
L3
C2
L4
C3
C4
L5
L6
C5
L7
L8
001aab085
See
Table 9
for details of striplines.
Fig 2.
Layout of class-AB application circuit
BLA0912-250#4
All information provided in this document is subject to legal disclaimers.
© Ampleon The Netherlands B.V. 2015. All rights reserved.
Product data sheet
Rev. 4 — 1 September
4 of 13
BLA0912-250
Avionics LDMOS transistor
Table 9.
Layout details
See
Figure 2.
Striplines are on a Rodgers Duroid 6010 Printed-Circuit Board (PCB);
r
= 10.2 F/m;
thickness = 0.64 mm
Component
Input circuit
L1
C1
L2
stripline
stripline
stripline
5 mm
0.8 mm
1.2 mm
3.5 mm
capacitor pad: 1 mm
1 mm (1)
curve: width 0.8 mm; angle 90; radius 0.8 mm (10)
vertical: 3.9 mm
0.8 mm (2)
vertical: 9.4 mm
0.8 mm (3)
horizontal: 0.5 mm
0.8 mm (4)
L3
C2
L4
C3
Output circuit
C4
L5
L6
C5
L7
stripline
stripline
stripline
stripline
stripline
0.2 mm
13 mm + 19 mm
17.1 mm
2.5 mm
2.3 mm
4 mm
1 mm
3 mm
6.6 mm
curve: width 0.8 mm; angle 90; radius 0.8 mm (6)
vertical: 2.2 mm
0.8 mm (2)
vertical: 6 mm
0.8 mm (1)
horizontal: 1 mm
0.8 mm (2)
L8
1/4
line
stripline
stripline
2.5 mm
0.8 mm
curve: width 1 mm; angle 90; radius 0.8 mm
vertical: 5 mm
1 mm
horizontal: 19 mm
1 mm
stripline
stripline
stripline
stripline
3 mm
2 mm
4 mm
6.5 mm
5 mm
1 mm
8.8 mm
30 mm + 0.2 mm
13 mm
Description
Dimensions
BLA0912-250#4
All information provided in this document is subject to legal disclaimers.
© Ampleon The Netherlands B.V. 2015. All rights reserved.
Product data sheet
Rev. 4 — 1 September
5 of 13
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