November 2011 Doc ID 17696 Rev 1 1/9
9
BAT54-Y
Automotive small signal Schottky diodes
Features
■Low conduction and reverse losses
■Negligible switching losses
■Low forward and reverse recovery times
■Extremely fast switching
■Surface mount device
■Low capacitance diode
■ECOPACK®2 compliant component
■AEC-Q101 qualified
Description
The BAT54 series uses 40 V Schottky barrier
diodes packaged in SOT-23, SOT-323. These
devices are suitable for automotive application.
Table 1. Device summary
Symbol Value
IF300 mA
VRRM 40 V
C (typ) 7 pF
Tj (max) 150 °C
BAT54WFILMY
(Single)
BAT54CWFILMY
(Common cathode)
BAT54AWFILMY
(Common anode)
SOT-323
Configurations in top view
SOT-23
BAT54FILMY
(Single)
BAT54SFILMY
(Series)
www.st.com
Characteristics BAT54-Y
2/9 Doc ID 17696 Rev 1
1 Characteristics
Table 2. Absolute ratings (limiting values at Tj = 25 °C, unless otherwise specified)
Symbol Parameter Value Unit
VRRM Repetitive peak reverse voltage 40 V
IFContinuous forward current 300 mA
IFSM Surge non repetitive forward current tp = 10 ms sinusoidal 1 A
Tstg Storage temperature range -65 to +150 °C
TjOperating junction temperature range -40 to +150 °C
TLMaximum soldering temperature 260 °C
Table 3. Thermal parameters
Symbol Parameter Value Unit
Rth(j-a) Junction to ambient(1)
1. Epoxy printed circuit board with recommended pad layout
SOT-23 500 °C/W
SOT-323 550 °C/W
Table 4. Static electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
IR(1)
1. Pulse test: tp = 5 ms, δ < 2 %
Reverse leakage
current
Tj = 25 °C VR = 30 V 1µA
Tj = 100 °C 100
VF(2)
2. Pulse test: tp = 380 µs, δ < 2 %
Forward voltage drop Tj = 25 °C
IF = 0.1 mA 240
mV
IF = 1 mA 320
IF = 10 mA 400
IF = 30 mA 500
IF = 100 mA 900
Table 5. Dynamic characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
CDiode
capacitance VR = 1 V, F = 1 MHz 7 10 pF
trr
Reverse
recovery time
IF = 10 mA, IR = 10 mA, Tj = 25 °C
Irr = 1 mA, RL = 100 Ω5ns
BAT54-Y Characteristics
Doc ID 17696 Rev 1 3/9
Figure 1. Average forward power dissipation
versus average forward current
Figure 2. Average forward current versus
ambient temperature (δ = 1)
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35
P(W)
δ=0.05 δ=0.2 δ=0.1 δ=0.5 δ=1
T
δ=tp/T tp
IF(AV)(A)
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0 25 50 75 100 125 150
I
F(AV)
(A)
T
δ=tp/T tp Tamb(°C)
Figure 3. Reverse leakage current versus
reverse applied voltage
(typical values)
Figure 4. Reverse leakage current versus
junction temperature
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02
0 5 10 15 20 25 30
I
R
(µA)
Tj=100°C
Tj=25°C
Tj=50°C
VR(V)
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
0 25 50 75 100 125 150
I
R
[T
j
]/I
R
[T
j
=25°C]
VR=3V
Tj(°C)
Figure 5. Junction capacitance versus
reverse applied voltage
(typical values)
Figure 6. Forward voltage drop versus
forward current (typical values)
1
10
1 10 100
C(pF)
F=1MHz
VOSC=30mVRMS
Tj=25°C
VR(V)
1.E-04
1.E-03
1.E-02
1.E-01
1.E+00
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
I
FM
(A)
Tj=50°CTj=50°C
Tj=25°CTj=25°C
Tj=-40 °CTj=-40 °C
Tj=100°CTj=100°C
VFM(V)
Characteristics BAT54-Y
4/9 Doc ID 17696 Rev 1
Figure 7. Relative variation of thermal impedance junction to ambient versus pulse duration
(SOT-23)
1.E-02
1.E-01
1.E+00
1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02
Z
th(j-a)
/R
th(j-a)
Alumine substrate
10 x 8 x 0.5 mm
Single pulse
SOT23
tP(s)
BAT54-Y Ordering information scheme
Doc ID 17696 Rev 1 5/9
2 Ordering information scheme
Figure 8. Ordering information scheme
BAT54 xx xx FILM Y
Signal Schottky diodes
Package
Packing
V = 40 V
RRM
No letter = Single diode
A = Common anode
C = Common cathode
S = Series diodes
Blank = SOT-23
W = SOT-323
FILM = Tape and reel
Configuration
Automotive grade
Package information BAT54-Y
6/9 Doc ID 17696 Rev 1
3 Package information
●Epoxy meets UL94, V0
●Lead-free packages
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 9. SOT-23 footprint (dimensions in mm)
Table 6. SOT-23 dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 0.89 1.4 0.035 0.055
A1 0 0.1 0 0.004
B 0.3 0.51 0.012 0.02
c 0.085 0.18 0.003 0.007
D 2.75 3.04 0.108 0.12
e 0.85 1.05 0.033 0.041
e1 1.7 2.1 0.067 0.083
E 1.2 1.6 0.047 0.063
H 2.1 2.75 0.083 0.108
L 0.6 typ. 0.024 typ.
S 0.35 0.65 0.014 0.026
A1
A
L
H
B
E
D
e
e1
S
c
0.95 0.61
1.26
3.25
0.73
BAT54-Y Package information
Doc ID 17696 Rev 1 7/9
Figure 10. SOT-323 footprint (dimensions in mm)
Table 7. SOT-323 dimensions
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 0.8 1.1 0.031 0.043
A1 0.0 0.1 0.0 0.004
b 0.25 0.4 0.010 0.016
c 0.1 0.26 0.004 0.010
D 1.8 2.0 2.2 0.071 0.079 0.086
E 1.15 1.25 1.35 0.045 0.049 0.053
e 0.65 0.026
H 1.8 2.1 2.4 0.071 0.083 0.094
L 0.1 0.2 0.3 0.004 0.008 0.012
q 0 30° 0 30°
A1
A
L
H
c
b
E
D
e
θ
0.95
1.0 2.9
0.500.8
Ordering information BAT54-Y
8/9 Doc ID 17696 Rev 1
4 Ordering information
5 Revision history
Table 8. Ordering information
Order code Marking Package Weight Base qty Delivery mode
BAT54FILMY 86Y SOT-23 Single 10 mg
3000 Tape and reel
BAT54SFILMY 88Y SOT-23 Serial 10 mg
BAT54WFILMY 73Y SOT-323 Single 6 mg
BAT54CWFILMY 77Y SOT-323
Common cathode 6 mg
BAT54AWFILMY 74Y SOT-323
Common anode 6 mg
Table 9. Document revision history
Date Revision Changes
04-Nov-2011 1 Initial release.
BAT54-Y
Doc ID 17696 Rev 1 9/9
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