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VISHAY
Small Signal Transistors (PNP)
BC856 to BC859
Vishay Semiconductors
Features
• PNP Silicon Epitaxial Planar Transistors for
switching and AF amplifier applications.
• Especially suited for automatic insertion in thick
and thin-film circuits.
• These transistors are subdivided into three groups
A, B, and C) according to their current gain. The
type BC856 is available in groups A and B, how-
ever, the types
BC857, BC558 and BC859 can be supplied in all
three groups. The BC849 is a low noise type.
3
18978
2
11
B
C3
E2
• As complementary types, the NPN transistors
BC846...BC849 are recomended.
Mechanical Data
Case: SOT-23 Plastic case
Weight: approx. 8.8 mg
Marking:
BC856A = 3A
BC858A = 3J
BC856B = 3B
BC858B = 3K
BC858C = 3L
BC857A = 3E
BC857B = 3F
BC857C = 3G
BC859A = 4A
BC859B = 4B
BC859C = 4C
Packaging Codes/Options:
GS18 / 10 k per 13" reel (8 mm tape), 10 k/box
GS08 / 3 k per 7" reel (8 mm tape), 15 k/box
Pinning:
1 = Base, 2 = Emitter, 3 = Collector
Document Number 85135
Rev. 1.2, 08-Sep-04
www.vishay.com
1
VISHAY
Layout for RthJA test
Thickness: Fiberglass 1.5 mm (0.059 in.)
Copper leads 0.3 mm (0.012 in.)
BC856 to BC859
Vishay Semiconductors
12 (0.47)
15 (0.59)
0.8 (0.03)
7.5 (0.3)
3 (0.12)
1 (0.4)
2 (0.8)
2 (0.8)
1 (0.4)
5 (0.2)
1.5 (0.06)
5.1 (0.2)
17451
Typical Characteristics (Tamb = 25 °C unless otherwise specified)
mW
500
400
Ptot 300
200
100
19195
0
0
100
TSB
200 °C
Figure 1. Admissible Power Dissipation vs. Temperature of
Substrate Backside
10 0.5
0.2
10-1 0.1
0.05
rthSB
R thSB
0.02
0.01
10-2
0.005
ν =0
tp
ν=
tp
T
T
PI
10-13 0-7 10-6
19191
10-5 10-4 10 -3 10-2
tp
10-1
1s
Figure 2. Pulse Thermal Resistance vs. Pulse Duration
(normalized)
Document Number 85135
Rev. 1.2, 08-Sep-04
www.vishay.com
5