Data Sheet
ACPL-K70A/K73A
Low Input Current, High Current Gain, LVTTL,
LVCMOS Optocoupler
Description
These high gain series couplers use a light-emitting diode
(LED) and an integrated high gain photodetector to provide
an extremely high current transfer ratio between input and
output. Separate pins for photodiode and output stage result
in LVTTL-compatible saturation voltages and high-speed
operation. Where desired, the V
CC
and V
O
terminals may be
tied together to achieve conventional photo-darlington
operation. A base access terminal allows a gain bandwidth
adjustment to be made.
These optocouplers are for use in LVTTL/LVCMOS or other
low-power applications.
The ACPL-K70A and ACPL-K73A are surface-mount
devices that are packaged in an industry-standard stretched
SOIC-8 footprint.
The stretched SOIC-8 does not require through holes in a
PCB.
Figure 1: Functional Diagram
Table 1: Truth Table
LED
ON
OFF
Output
L
H
A 0.1-μF bypass capacitor must be connected between pins
V
CC
and GND.
Features
3.3V/5V dual supply voltages
Low power consumption
High current transfer ratio
Low input current requirements: 0.04 mA
Stretched SO8 package
LVTTL/LVCMOS compatible output
Guaranteed performance within the temperature range
–40°C to +105°C
Base access allows gain bandwidth adjustment
High output current: 60 mA
Worldwide Safety Approval:
– UL1577 recognized: 5000 V
rms
/1 min
– CSA approval
– IEC 60747-5-5 approval for reinforced insulation
CAUTION!
Take normal static precautions in handling and assembling this component to prevent damage and/or
degradation that may be induced by ESD. The components featured in this data sheet are not to be used in
military or aerospace applications or environments.
Broadcom
ACPL-K70A-K73A-DS100
October 29, 2019
ACPL-K70A/K73A
Data Sheet
Low Input Current, High Current Gain, LVTTL, LVCMOS Optocoupler
Applications
EIA RS-232C/low input current line receiver
Low power systems: ground isolation
Line voltage status indicator; low input power dissipation
Ordering Information
ACPL-K70A/K73A is UL recognized with 5000 V
rms
for 1 minute per UL 1577.
Part Number
Option
____________
RoHS
Compliant
ACPL-
K70A/K73A
-000E
-060E
-500E
-560E
Stretched SO8
X
X
X
X
X
X
X
X
X
X
X
X
80 per tube
80 per tube
1000 per reel
1000 per reel
Package
Surface Mount
Tape & Reel
UL 1577
IEC 60747-5-5
Quantity
To form an order entry, choose a part number from the Part Number column and combine with the desired option from the
Option column.
Package Outline Drawing
Figure 2: ACPL-K70A/K73A Stretched SO8 Package
Broadcom
ACPL-K70A-K73A-DS100
2
ACPL-K70A/K73A
Data Sheet
Low Input Current, High Current Gain, LVTTL, LVCMOS Optocoupler
Solder Reflow Profile
Recommended reflow condition as per JEDEC standard J-STD-020 (latest revision). Non-halide flux should be used.
Regulatory Information
The ACPL-K70A/K73A is pending approval by the following organizations:
UL—Approval
under UL 1577, component recognition program up to V
ISO
= 5000 V
RMS
File E55361.
CSA—Approval
under CSA Component Acceptance Notice #5, File CA 88324.
IEC 60747-5-5
Table 2: Insulation and Safety Related Specifications
Parameter
Minimum External Air Gap (External
Clearance)
Minimum External Tracking (External
Creepage)
Minimum Internal Plastic Gap (Internal
Clearance)
Symbol
L(101)
L(102)
ACPL-
K70A/K73A
8
8
Units
mm
mm
Conditions
Measured from input terminals to output
terminals, shortest distance through air.
Measured from input terminals to output
terminals, shortest distance path along
body.
Through insulation distance conductor
to conductor, usually the straight line
distance thickness between the emitter
and detector.
DIN IEC 112/VDE 0303 Part 1.
Material Group (DIN VDE 0110, 1/89,
Table 1).
—
0.08
mm
Tracking Resistance (Comparative
Tracking Index)
Isolation Group
CTI
—
175
IIIa
V
—
Table 3: IEC 60747-5-5 Insulation Characteristics
1
Description
Symbol
Characteristic
ACPL-
K70A/K73A
I - IV
I - IV
I - IV
I - III
—
—
V
IORM
V
PR
40/105/21
2
1140
2137
—
—
V
peak
V
peak
Unit
Installation classification per DIN VDE 0110/39, Table 1
For rated mains voltage
≤
150 V
rms
For rated mains voltage
≤
300 V
rms
For rated mains voltage
≤
600 V
rms
For rated mains voltage
≤
1000 V
rms
Climatic Classification
Pollution Degree (DIN VDE 0110/39)
Maximum Working Insulation Voltage
Input to Output Test Voltage, Method b
1
V
IORM
× 1.875 = V
PR
, 100% Production Test with t
m
= 1 sec,
Partial discharge < 5 pC
Input to Output Test Voltage, Method a
1
V
IORM
× 1.6 = V
PR
, Type and Sample Test, t
m
= 10 sec,
Partial discharge < 5 pC
—
—
V
PR
1824
V
peak
Broadcom
ACPL-K70A-K73A-DS100
3
ACPL-K70A/K73A
Data Sheet
Low Input Current, High Current Gain, LVTTL, LVCMOS Optocoupler
Table 3: IEC 60747-5-5 Insulation Characteristics
1
(Continued)
Description
Symbol
Characteristic
ACPL-
K70A/K73A
8000
Unit
Highest Allowable Overvoltage
(Transient Overvoltage t
ini
= 60 sec)
Safety-limiting values: maximum values allowed in the event of a failure.
Case Temperature
Input Current
Output Power
Insulation Resistance at T
S
, V
IO
= 500 V
V
IOTM
V
peak
T
S
I
S, INPUT
P
S, OUTPUT
R
S
175
230
600
>10
9
°C
mA
mW
Ω
1. Refer to the optocoupler section of the
Isolation and Control Components Designer's Catalog,
under the “Product Safety Regulations” section,
(IEC 60747-5-5) for a detailed description of Method a and Method b partial discharge test profiles.
Table 4: Absolute Maximum Ratings
Parameter
Storage Temperature
Operating Temperature
Lead Soldering Cycle
Average Forward Input Current
Peak Forward Input Current
(50% duty cycle, 1-ms pulse width)
Peak Transient Input Current
(≤ 1
μs
pulse width, 300 pps)
Reversed Input Voltage
Input Power Dissipation
Output Power Dissipation
Output Current
Emitter Base Reverse Voltage (Pin 5–7)
Output Transistor Base Current
Supply Voltage and Output Voltage
Solder Reflow Temperature Profile
Temperature
Time
I
F(avg)
I
F(peak)
I
F(trans)
V
R
P
IN
P
O
I
O(AVG)
V
EB
I
B
V
CC
—
—
—
—
—
—
—
—
—
–0.5
Symbol
T
S
T
A
Min.
–55
–40
Max.
125
105
260
10
20
40
1.0
5
35
100
60
0.5
5
18
Units
°C
°C
°C
s
mA
mA
A
V
mW
mW
mA
V
mA
V
See
Package Outline Drawing.
Table 5: Recommended Operating Conditions
Parameter
Supply Voltage
Forward Input Current (ON)
Operating Temperature
Forward Input Voltage (OFF)
Output Current
Symbol
V
CC
I
F(ON)
T
A
V
F(OFF)
I
O(AVG)
Min.
3.3
0.04
–40
—
—
Max.
18.0
12
105
0.8
25
Units
V
mA
°C
V
mA
Broadcom
ACPL-K70A-K73A-DS100
4
ACPL-K70A/K73A
Data Sheet
Low Input Current, High Current Gain, LVTTL, LVCMOS Optocoupler
Table 6: Electrical Specifications (DC)
Over-recommended operating (T
A
= –40°C to 105°C) unless otherwise specified. All typical specifications are at T
A
= 25°C.
Parameter
Current Transfer Ratio
Sym.
CTR
1
Min.
800
400
300
Logic Low Output Voltage
V
OL
—
—
Logic High Output Current
I
OH
—
—
—
—
Logic Low Supply Current
2
I
CCL
—
—
—
Logic High Supply Current
2
I
CCH
—
Typ.
8000
3500
1980
0.02
0.04
0.003
18
0.01
50
0.03
0.53
1.75
0.08
Max.
25,000
8000
5000
0.4
0.4
5
100
80
250
0.2
1
2.5
10
Units
%
%
%
V
V
μA
μA
μA
μA
mA
mA
mA
μA
Conditions
I
F
= 0.04 mA
I
F
= 0.5 mA
I
F
= 1.6 mA
I
F
= 0.04 mA
I
O
= 280
μA
I
F
= 0.5 mA or
1.6 mA, I
O
= 3.0 mA
–40°C
≤
T
A
≤
70°C V
O
= V
CC
= 3.3V or 5V
I
F
= 0 mA
70°C < T
≤
105°C
A
Fig.
4, 5
V
CC
= 3.3V or 5V
V
O
= 0.4V
V
CC
= 3.3V or 5V
—
—
—
—
—
–40°C
≤
T
A
≤
70°C
70°C < T
A
≤
105°C
I
F
= 0.04 mA
I
F
= 0.5 mA
I
F
= 1.6 mA
I
F
= 0 mA
V
O
= open
V
CC
= 18V
I
F
= 0.04 mA to
1.6 mA
I
F
= 12 mA
I
R
= 100
μA
I
F
= 1.6 mA
f = 1 MHz
V
F
= 0
V
O
= V
CC
= 18V
I
F
= 0 mA
V
O
= open
V
CC
= 18V
—
—
Input Forward Voltage
V
F
—
—
1.3
1.4
5
–1.6
18
1.7
1.8
—
—
—
V
V
V
mV/°C
pF
—
3
Input Reversed Breakdown
Voltage
Temperature Coefficient of
Forward Voltage
Input Capacitance
BV
R
ΔV
F
/ΔT
A
C
IN
2.5
—
—
—
—
—
—
—
—
1. Current transfer ratio in percent is defined as the ratio of output collector current, I
O
, to the forward LED input current, I
F
, multiplied by 100%.
2. Each channel.
Broadcom
ACPL-K70A-K73A-DS100
5
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