Page 1
High current, high performance, low voltage
Features
■ Very low collector to emitter saturation voltage
■ DC current gain, h
■ 5 A continuous collector current
Applications
■ Power management in portable equipment
■ Voltage regulation in bias supply circuits
■ Switching regulator in battery charger
applications
■ Heavy load driver
FE
>100
STD878
STN878
NPN transistors
4
3
2
1
SOT-223
Figure 1. Internal schematic diagram
4
1
DPAK
3
Description
The devices are manufactured in low voltage NPN
planar technology with “base island” layout. the
resulting transistor shows exceptional high gain
performance coupled with very low saturation
voltage.
Table 1. Device summary
Order codes Markings Packages Packaging
STD878T4 D878 DPAK Tape and reel
STN878 N878 SOT-223 Tape and reel
August 2010 Doc ID 13836 Rev 2 1/10
www.st.com
10
Page 2
Electrical ratings STD878, STN878
1 Electrical ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
V
V
I
Collector-base voltage (IE = 0) 45 V
CBO
Collector-emitter voltage (IB = 0) 30 V
CEO
Emitter-base voltage (IC = 0) 6 V
EBO
I
Collector current 5 A
C
Collector peak current (tP < 5 ms) 10 A
CM
Total dissipation at TC = 25 °C for STD878 15
P
T
TOT
Total dissipation at T
Storage temperature -65 to 150 °C
STG
T
Max. operating junction temperature 150 °C
J
= 25 °C for STN878 1.6
amb
Table 3. Thermal data
Symbol Parameter Value Unit
R
R
1. Device mounted on PCB area of 1 cm2.
Thermal resistance junction-case for STD878 __max 8.3 °C/W
thJC
Thermal resistance junction-ambient for STN878
thJA
(1)
_max
78 °C/W
W
2/10 Doc ID 13836 Rev 2
Page 3
STD878, STN878 Electrical characteristics
2 Electrical characteristics
T
= 25 °C unless otherwise specified.
case
Table 4. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
= 30 V
I
CBO
I
EBO
Collector cut-off current
(IE = 0)
Emitter cut-off current
= 0)
(I
C
V
CB
= 30 V; TC = 100 °C
V
CB
V
= 6 V 10 µA
EB
Collector-emitter
V
(BR)CEO
breakdown voltage
= 0)
(I
B
= 10 mA 30 V
I
C
(1)
Collector-base
V
(BR)CBO
V
(BR)EBO
breakdown voltage
= 0)
(I
E
Emitter-base breakdown
voltage (IC = 0)
= 100 µA 45 V
I
C
I
= 100 µA 6 V
E
IC = 0.5 A IB = 5 mA
IC = 2 A IB = 50 mA
= 5 A IB = 0.25 A
V
CE(sat)
Collector-emitter
(1)
saturation voltage
I
C
= 6 A IB = 0.25 A
I
C
IC = 8 A IB = 0.4 A
= 10 A IB = 0.5 A
I
C
= 2 A IB = 50 mA
V
BE(sat)
h
FE
Base-emitter saturation
(1)
voltage
(1)
DC current gain
I
C
= 6 A IB = 0.25 A 1.2
I
C
= 10 mA V
I
C
= 500 mA V
I
C
= 5 A V
I
C
IC = 5 A V
= 100 °C
T
c
= 8 A V
I
C
IC = 10 A V
Resistive load
t
d
t
r
t
s
t
f
1. Pulse test: pulse duration ≤ 300 µs, duty cycle ≤ 2 %
Delay time
Rise time
Storage time
Fall time
= 3 A V
I
C
- I
I
B1 =
see Figure 8
B2 =
60 mA
CC
= 1 V
CE
= 1 V
CE
= 1 V
CE
= 1 V
CE
= 1 V
CE
= 1 V
CE
= 20 V
120
100
70
0.7
1
1.2
200
200
100
100
55
35
180
160
250
80
10
100µAµA
0.15
0.35
0.7
1.1 V
300
220
210
300
100
V
V
V
V
V
V
V
ns
ns
ns
ns
Doc ID 13836 Rev 2 3/10
Page 4
Electrical characteristics STD878, STN878
2.1 Electrical characteristics (curves)
Figure 2. DC current gain (V
= 1 V) Figure 3. DC current gain (VCE = 3 V)
CE
Figure 4. Collector-emitter saturation
voltage
Figure 6. Resistive load switching time
(ON)
Figure 5. Base-emitter saturation
voltage
Figure 7. Resistive load switching time
(OFF)
4/10 Doc ID 13836 Rev 2
Page 5
STD878, STN878 Electrical characteristics
2.2 Test circuits
Figure 8. Resistive load switching test circuit
1. Fast electronic switch
2. Non-inductive resistor
Doc ID 13836 Rev 2 5/10
Page 6
Package mechanical data STD878, STN878
3 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
6/10 Doc ID 13836 Rev 2
Page 7
STD878, STN878 Package mechanical data
SOT-223 mechanical data
Dim.
mm.
Min. Typ. Max.
A 1.80
A1 0.02 0.1
B 0.60 0.70 0.85
B1 2.90 3.00 3.15
c 0.24 0.26 0.35
D6.30 6.50 6.70
e2.30
e1 4.60
E 3.30 3.50 3.70
H 6.70 7.00 7.30
V 10
o
0046067_M
Doc ID 13836 Rev 2 7/10
Page 8
Package mechanical data STD878, STN878
TO-252 (DPAK) mechanical data
DIM.
V2 0
mm.
.xampyt.nim
04.202.2A
01.109.01A
32.030.02A
09.046.0b
04.502.54b
06.054.0c
06.084.02c
02.600.6D
01.51D
.6E
07.41E
82.2e
1L
08.21L
08.02L
02.0R
o
06.604
06.404.41e
01.0153.9H
106.04L
o
8
8/10 Doc ID 13836 Rev 2
0068772_G
Page 9
STD878, STN878 Revision history
4 Revision history
Table 5. Document revision history
Date Revision Changes
21-Aug-2007 1 Initial release.
30-Aug-2010 2 Inserted STD878T4 order code Table 1 on page 1.
Doc ID 13836 Rev 2 9/10
Page 10
STD878, STN878
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10/10 Doc ID 13836 Rev 2
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