BC856A – BC858C
Document Number: DS11207 Rev. 20 - 2
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www.diodes.com July 2011
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BC856A-BC858C
PNP SURFACE MOUNT SMALL SIGNAL TRANSISTOR IN SOT23
Features
• Ideally Suited for Automatic Insertion
• Complementary NPN Types Available (BC846 – BC848)
• For switching and AF Amplifier Applications
• Lead Free, RoHS Compliant (Note 1)
• Halogen and Antimony Free "Green" Device (Note 2)
• Qualified to AEC-Q101 Standards for High Reliability
Mechanical Data
• Case: SOT-23
• UL Flammability Rating 94V-0
• Case material: molded Plastic “Green” Compound
• Moisture Sensitivity: Level 1 per J-STD-020
• Terminals: Matte Tin Finish
• Weight: 0.008 grams (Approximate)
Ordering Information (Note 3 & 4)
Product Marking
Reel size
(inches) Quantity per reel
BC856A-7-F K3A 7 3,000
BC856B-7-F K3B 7 3,000
BC856BQ-7-F K3B 7 3,000
BC856B-13-F K3B 13 10,000
BC857A-7-F K3A 7 3,000
BC857B-7-F K3B 7 3,000
BC857BQ-7-F K3B 7 3,000
BC857B-13-F K3B 13 10,000
Notes: 1. No purposefully added lead.
2. Diodes Inc.`s “Green” Policy can be found on our website at http://www.diodes.com
3. Tape width is 8mm. For more packaging details, go to our website at http://www.diodes.com.
4. Products with Q-suffix are automotive grade. All other products are commercial grade.
Marking Information
Date Code Key
Year 2010 2011 2012 2013 2014 2015 2016 2017
Code X Y Z A B C D E
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Code 1 2 3 4 5 6 7 8 9 O N D
Product Marking
Reel size
(inches) Quantity per reel
BC857C-7-F K3G 7 3,000
BC857C-13-F K3G 13 10,000
BC858A-7-F K3A 7 3,000
BC858B-7-F K3B 7 3,000
BC858BQ-7-F K3B 7 3,000
BC858C-7-F K3G 7 3,000
C
E
B
Top View
SOT23
Device Symbol Top View
Pin
-
Out
XXX = Product Type Marking Code,
YM = Date Code Marking
Y = Year ex: X = 2010
M = Month ex: 9 = September
XXX
YM
BC856A – BC858C
Document Number: DS11207 Rev. 20 - 2
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BC856A-BC858C
Maximum Ratings @TA = 25°C unless otherwise specified
Characteristic Symbol Value Unit
Collector-Base Voltage BC856 VCBO -80 V
BC857 -50
BC858 -30
Collector-Emitter Voltage BC856 VCEO -65 V
BC857 -45
BC858 -30
Emitter-Base Voltage VEBO -5.0 V
Continuous Collector Current IC -100 mA
Peak Collector Current ICM -200 mA
Peak Emitter Current IEM -200 mA
Thermal Characteristics @TA = 25°C unless otherwise specified
Characteristic Symbol Value Unit
Power Dissipation (Note 5) PD 300 mW
Thermal Resistance, Junction to Ambient (Note 5) RθJA 417 °C/W
Operating and Storage Temperature Range TJ, TSTG -65 to +150 °C
Notes: 5. For a device surface mounted on minimum recommended pad layout FR4 PCB with high coverage of single sided 1oz copper in still air conditions; the
device is measured when operating in a steady-state condition.
BC856A – BC858C
Document Number: DS11207 Rev. 20 - 2
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BC856A-BC858C
Electrical Characteristics @TA = 25°C unless otherwise specified
Characteristic Symbol Min Typ Max Unit Test Condition
Collector-Base Breakdown Voltage BC856 BVCBO -80 - - V IC = -10µA
BC857 -50
BC858 -30
Collector-Emitter Breakdown Voltage
(Note 6)
BC856 BVCEO -65 - - V IC = -10mA
BC857 -45
BC858 -30
Emitter-Base Breakdown Voltage BVEBO -5 - - V IE = -1µA
Collector Cutoff Current ICBO - -
-15 µA VCB = -30V
-4 VCB = -30V, TA=150°C
Collector Emitter Cutoff Current BC856 ICES - -
-15 nA VCE= -80V
BC857 -15
VCE= -50V
BC858 -15
VCE= -30V
Small Signal Current Gain
(Note 6)
BC856A / BC857A / BC858A hfe - 200 - -
IC = -2.0mA, VCE = -5V
f=1.0kHz
BC856B / BC857B / BC858B 330
BC857C / BC858C 600
Input Impedance
(Note 6)
BC856A / BC857A / BC858A hie - 2.7 - kΩ
BC856B / BC857B / BC858B 4.5
BC857C / BC858C 8.7
Output Admittance
(Note 6)
BC856A / BC857A / BC858A hoe - 18 - µS
BC856B / BC857B / BC858B 30
BC857C / BC858C 60
Reverse Voltage Transfer
Ratio (Note 6)
BC856A / BC857A / BC858A hre - 1.5x10-
4
- -
BC856B / BC857B / BC858B 2x10-
4
BC857C / BC858C 3x10-
4
DC Current Gain (Note 6) BC856A / BC857A / BC858A hFE 125 180 250
- IC = -2.0mA, VCE = -5V BC856B / BC857B / BC858B 220 290 475
BC857C / BC858C 420 520 800
Collector-Emitter Saturation Voltage
(Note 6) VCE(sat) - -75 -300
mV IC =- 10mA, IB = -0.5mA
-250 -650 IC =- 100mA, IB = -5.0mA
Base-Emitter Turn-On Voltage(Note 6) VBE(on) -600 -650 -750
mV IC = -2mA, VCE = -5V
- - -820 IC = -10mA, VCE = -5V
Base-Emitter Saturation Voltage(Note 6) VBE(sat) - -700 - mV
IC = -10mA, IB = -0.5mA
-850 IC = -100mA, IB = -5mA
Output Capacitance Cobo - 3 - pF
VCB = -10V, f = 1.0MHz
Transition Frequency fT 100 200 - MHz
VCE = -5V, IC = -10mA,
f = 100MHz
Noise Figure NF - 2 10 dB VCE=--5V, IC =-200µA
RS =2kΩ, f=1kHz
∆f=200Hz
Note: 6.
Short duration pulse test used to minimize self-heating effect.
BC856A – BC858C
Document Number: DS11207 Rev. 20 - 2
4 of 6
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BC856A-BC858C
Typical Electrical Characteristics
0
50
100
25 50 75 100 125 150 175 200
P
,
P
O
WE
R
DISSI
P
A
T
I
O
N
(mW)
D
T , AMBIENT TEMPERA TURE (°C)
Fig. 1, Max Power Dissipation vs
Am bi ent Tem per at ure
A
150
200
250
300
350
0
10.1 10 100 1000
V,
C
O
LLE
C
T
O
R
T
O
EMI
T
T
E
R
SATURATION VOLTAGE (V)
CE(SAT)
I , COLLECTOR CURRENT (mA)
Fig. 2 Collector Emitter Saturation Voltage
vs. Col lector Cu r rent
C
T= 25°C
A
T= -50°C
A
T =150°C
A
0
0.1
0.2
0.3
0.4
0.5
I
I
C
B
= 10
0
0.1
0.2
0.3
0.4
0.5
0.1 1.0 10 100
h
F
E, D
C
C
U
R
R
EN
T
G
AIN (N
O
R
MALIZED)
I , COLLECTOR CURRENT (mA)
Fig. 3, DC Current Gain vs. Collector Current
C
10
100
1000
110 100
f,
G
AIN BANDWID
T
H
P
R
O
D
U
C
T
(M
H
z)
t
I , COLLECTOR CURRENT (mA)
Fig. 4, Gain Bandwidth Product vs Collector Current
C
V= 5V
CE
BC856A – BC858C
Document Number: DS11207 Rev. 20 - 2
5 of 6
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© Diodes Incorporated
BC856A-BC858C
Package Outline Dimensions
Suggested Pad Layout
SOT23
Dim Min Max Typ
A 0.37 0.51 0.40
B 1.20 1.40 1.30
C 2.30 2.50 2.40
D 0.89 1.03 0.915
F 0.45 0.60 0.535
G 1.78 2.05 1.83
H 2.80 3.00 2.90
J 0.013 0.10 0.05
K 0.903 1.10 1.00
K1 - - 0.400
L 0.45 0.61 0.55
M 0.085 0.18 0.11
α 0° 8° -
All Dimensions in mm
Dimensions Value (in mm)
Z 2.9
X 0.8
Y 0.9
C 2.0
E 1.35
A
M
JL
D
F
BC
H
K
G
K1
XE
Y
C
Z
BC856A – BC858C
Document Number: DS11207 Rev. 20 - 2
6 of 6
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© Diodes Incorporated
BC856A-BC858C
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other
changes without further notice to this doc ument and an y product described herein. Diodes Incorporat ed does not assu me any liability arising
out of the application or use of this document or any product descr ibed herein; neither does Diodes Incorporated convey any license under
its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such
applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are
represented on Diodes Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales
channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall
indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising
out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and
markings noted herein may also be covered by one or more United States, international or foreign trademarks.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the
express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in
the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perfo rm can be re asonabl y expected to cause
the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems,
and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their
products and any use of Diodes I ncorporated products in such safety-critical, life support devices or systems, notwithstanding any devices-
or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes
Incorporated and its representatives against any d amages arising out of the use of Diodes Incorpor ated products in such safety-critical, life
support devices or systems.
Copyright © 2011, Diodes Incorporated
www.diodes.com
