1
Motorola SmallSignal Transistors, FETs and Diodes Device Data
Schottky Barrier Diode
These Schottky barrier diodes are designed for high speed switching applications,
circuit protection, and voltage clamping. Extremely low forward voltage reduces
conduction loss. Miniature surface mount package is excellent for hand held and
portable applications where space is limited.
Extremely Fast Switching Speed
Extremely Low Forward Voltage -- 0.35 Volts (Typ) @ IF = 10 mAdc
MAXIMUM RATINGS
(TJ = 125
C unless otherwise noted)
Rating
Symbol
Value
Unit
Reverse Voltage
VR
30
Volts
Forward Power Dissipation
@ TA = 25
C
Derate above 25
C
PF
200
1.6
mW
mW/
C
Forward Current (DC)
IF
200 Max
mA
Junction Temperature
TJ
125 Max
C
Storage Temperature Range
Tstg
55 to +150
C
DEVICE MARKING
BAT54WT1 = B4
ELECTRICAL CHARACTERISTICS
(TA = 25
C unless otherwise noted)
Characteristic
Symbol
Min
Typ
Max
Unit
Reverse Breakdown Voltage (IR = 10
A)
V(BR)R
30
--
--
Volts
Total Capacitance (VR = 1.0 V, f = 1.0 MHz)
CT
--
7.6
10
pF
Reverse Leakage (VR = 25 V)
IR
--
0.5
2.0
Adc
Forward Voltage (IF = 0.1 mAdc)
VF
--
0.22
0.24
Vdc
Forward Voltage (IF = 30 mAdc)
VF
--
0.41
0.5
Vdc
Forward Voltage (IF = 100 mAdc)
VF
--
0.52
1.0
Vdc
Reverse Recovery Time
(IF = IR = 10 mAdc, IR(REC) = 1.0 mAdc) Figure 1
trr
--
--
5.0
ns
Forward Voltage (IF = 1.0 mAdc)
VF
--
0.29
0.32
Vdc
Forward Voltage (IF = 10 mAdc)
VF
--
0.35
0.40
Vdc
Forward Current (DC)
IF
--
--
200
mAdc
Repetitive Peak Forward Current
IFRM
--
--
300
mAdc
NonRepetitive Peak Forward Current (t < 1.0 s)
IFSM
--
--
600
mAdc
Thermal Clad is a registered trademark of the Bergquist Company.
Preferred devices are Motorola recommended choices for future use and best overall value.
Order this document
by BAT54WT1/D
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
BAT54WT1
Motorola Preferred Device
30 VOLTS
SCHOTTKY BARRIER
DETECTOR AND SWITCHING
DIODE
1
2
3
CASE 419 02, STYLE 2
SOT 323 (SC 70)
Motorola, Inc. 1997
3
CATHODE
1
ANODE
REV 3
BAT54WT1
2
Motorola SmallSignal Transistors, FETs and Diodes Device Data
Notes: 1. A 2.0 k
variable resistor adjusted for a Forward Current (IF) of 10 mA.
Notes:
2. Input pulse is adjusted so IR(peak) is equal to 10 mA.
Notes:
3. tp trr
+10 V
2 k
820
0.1
F
DUT
VR
100
H
0.1
F
50
OUTPUT
PULSE
GENERATOR
50
INPUT
SAMPLING
OSCILLOSCOPE
tr
tp
t
10%
90%
IF
IR
trr
t
iR(REC) = 1 mA
OUTPUT PULSE
(IF = IR = 10 mA; measured
at iR(REC) = 1 mA)
IF
INPUT SIGNAL
Figure 1. Recovery Time Equivalent Test Circuit
100
0.0
0.1
VF, FORWARD VOLTAGE (VOLTS)
0.2
0.3
0.4
0.5
10
1.0
0.1
85
C
10
0
VR, REVERSE VOLTAGE (VOLTS)
1.0
0.1
0.01
0.001
5
10
15
20
25
14
0
VR, REVERSE VOLTAGE (VOLTS)
12
4
2
0
C
T
, T
O
T
A
L
CAP
ACIT
ANCE (pF)
5
10
15
30
I F
, FOR
W
ARD
CURRENT
(mA)
Figure 2. Forward Voltage
Figure 3. Leakage Current
Figure 4. Total Capacitance
40
C
25
C
TA = 150
C
TA = 125
C
TA = 85
C
TA = 25
C
I R
, REVERSE CURRENT
(
A)
0.6
55
C
1 50
C
1 25
C
100
1000
30
25
20
6
8
10
BAT54WT1
3
Motorola SmallSignal Transistors, FETs and Diodes Device Data
INFORMATION FOR USING THE SOT323 SURFACE MOUNT PACKAGE
MINIMUM RECOMMENDED FOOTPRINT FOR SURFACE MOUNTED APPLICATIONS
Surface mount board layout is a critical portion of the total
design. The footprint for the semiconductor packages must
be the correct size to insure proper solder connection
interface between the board and the package. With the
correct pad geometry, the packages will self align when
subjected to a solder reflow process.
mm
inches
0.035
0.9
0.075
0.7
1.9
0.028
0.65
0.025
0.65
0.025
SC70/SOT323 POWER DISSIPATION
The power dissipation of the SC70/SOT323 is a function
of the collector pad size. This can vary from the minimum
pad size for soldering to the pad size given for maximum
power dissipation. Power dissipation for a surface mount
device is determined by TJ(max), the maximum rated junction
temperature of the die, R
JA, the thermal resistance from the
device junction to ambient; and the operating temperature,
TA. Using the values provided on the data sheet, PD can be
calculated as follows.
PD =
TJ(max) TA
R
JA
The values for the equation are found in the maximum
ratings table on the data sheet. Substituting these values into
the equation for an ambient temperature TA of 25
C, one can
calculate the power dissipation of the device which in this
case is 200 milliwatts.
PD =
150
C 25
C
0.625
C/W
= 200 milliwatts
The 0.625
C/W assumes the use of the recommended
footprint on a glass epoxy printed circuit board to achieve a
power dissipation of 200 milliwatts. Another alternative would
be to use a ceramic substrate or an aluminum core board
such as Thermal Clad
TM
. Using a board material such as
Thermal Clad, a power dissipation of 300 milliwatts can be
achieved using the same footprint.
SOLDERING PRECAUTIONS
The melting temperature of solder is higher than the rated
temperature of the device. When the entire device is heated
to a high temperature, failure to complete soldering within a
short time could result in device failure. Therefore, the
following items should always be observed in order to
minimize the thermal stress to which the devices are
subjected.
Always preheat the device.
The delta temperature between the preheat and
soldering should be 100
C or less.*
When preheating and soldering, the temperature of the
leads and the case must not exceed the maximum
temperature ratings as shown on the data sheet. When
using infrared heating with the reflow soldering method,
the difference should be a maximum of 10
C.
The soldering temperature and time should not exceed
260
C for more than 10 seconds.
When shifting from preheating to soldering, the
maximum temperature gradient should be 5
C or less.
After soldering has been completed, the device should
be allowed to cool naturally for at least three minutes.
Gradual cooling should be used as the use of forced
cooling will increase the temperature gradient and result
in latent failure due to mechanical stress.
Mechanical stress or shock should not be applied during
cooling
* Soldering a device without preheating can cause excessive
thermal shock and stress which can result in damage to the
device.
BAT54WT1
4
Motorola SmallSignal Transistors, FETs and Diodes Device Data
PACKAGE DIMENSIONS
CASE 41902
ISSUE H
SOT323 (SC70)
C
R
N
A
L
D
G
V
S
B
H
J
K
3
1
2
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
DIM
MIN
MAX
MIN
MAX
MILLIMETERS
INCHES
A
0.071
0.087
1.80
2.20
B
0.045
0.053
1.15
1.35
C
0.035
0.049
0.90
1.25
D
0.012
0.016
0.30
0.40
G
0.047
0.055
1.20
1.40
H
0.000
0.004
0.00
0.10
J
0.004
0.010
0.10
0.25
K
0.017 REF
0.425 REF
L
0.026 BSC
0.650 BSC
N
0.028 REF
0.700 REF
R
0.031
0.039
0.80
1.00
S
0.079
0.087
2.00
2.20
V
0.012
0.016
0.30
0.40
0.05 (0.002)
STYLE 2:
PIN 1. ANODE
2. N.C.
3. CATHODE
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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals"
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BAT54WT1/D
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