AAHS298B
Radiation Tolerant 8-channel Source Driver
Description
The AAHS298B is part of Microsemi’s new family of
Radiation Tolerant products aimed at the aerospace
and defense markets. The AAHS298B is a Radiation-
Tolerant source driver with eight non-inverting
channels, with internal thermal shutdown.
Capable of providing an interface from TTL, 5V or 12V
logic systems to relays, motors, solenoids, and other
loads, this device adds the additional benefit of an
internal thermal shutdown and output transient
protection/clamp diodes with sustaining voltages to
75V.
Each output is capable of sourcing 700mA with a
withstand voltage of 75V over the full military
temperature range. The thermal shutdown is intended
to protect against over-current and soft-start
occurrences.
The AAHS298B is offered in 20-pin ceramic SOIC
package with formed and flat leads. The AAHS298B
has demonstrated tolerance to 100kRad (Si) total dose
(min), 50kRad (Si) ELDRS (min), as well as immunity
to latch-up and SEE tolerance. Available standard
screening includes Level “S” or Level “B,” Other
screening or processing in line with our capabilities can
be supported to meet customers’ requirements.
Features
700mA Output Source Current
Zero Quiescent Off Current
Full Channel Isolation to Prevent Fault
Propagation
Internal Ground Clamp Diodes
75V Output Breakdown Voltage
TTL, 5V and 12V Logic Compatible
Internal Thermal Shutdown
Radiation tolerant to 100kRad(Si) Total Dose,
50kRad (Si) ELDRS
-55°C to +125°C Temperature Range
Available in 20-pin Ceramic SOIC with formed
and flat Leads
QML-V and QML-Q Qualified
Applications
Relay/Solenoid Drivers
Lamp/LED Drivers
Stepper and/or Servo Motor Drivers
Redundant Power Distribution
Product Highlight
VS1
1
VS2
AAHS298B
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
12
13
14
15
16
17
18
19
20
10
9
8
7
6
5
4
3
2
11
12
13
14
15
16
17
18
19
20
10
9
8
7
6
5
4
3
2
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
VS1
2
3
4
5
6
7
8
9
1
0
IN8
IN7
IN6
IN5
IN4
IN3
IN2
IN1
VS2
LX7710
11
LX7710
CH1 Power Bus
CH2 Power Bus
CH3 Power Bus
CH4 Power Bus
CH5 Power Bus
CH6 Power Bus
CH7 Power Bus
CH8 Power Bus
1
AAHS298B
1
Figure 1 ·
Redundant Switchable Power Bus
March 2016 Rev. 1.4
www.microsemi.com
© 2015 Microsemi Corporation- Analog Mixed Signal
1
Pin Configuration and Pinout
Pin Configuration and Pinout
V
S
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
V
S
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
GND
S20 P
ACKAGE
YYWW XXX = Year/Week/Serial Number
S Flow marking shown i.e. MSC-S
MSC-S
AAHS298B
1MN37
YYWW XXX
(Top View)
Ordering Information
Ambient
Temperature
Type
Package
Part Number
Flow
Equivalent to
Class V
Tray
AAHS298B-06-4020A-EQ
AAHS298B-S-S20B-S
-55°C to
125°C
Hermetic
CSOIC 20L
SMD 5962-1523101VXA
AAHS298B-S-S20B-B
SMD 5962-1523101QXA
AAHS298B-S-S20B-ENGR
Equivalent to
Class Q
QML-V
Tray
Packaging
Type
AAHS298B-07-4020A-EV
-55°C to
125°C
Hermetic
CSOIC 20L
Flat Lead
QML- Q
Commercial
0°C to 70°C
AAHS298B Rev. 1.4
2
Pin Description
Pin Description
Pin Number
1, 10
2-9
11, 20
12-19
Pin Designator
Supply Voltage
IN[1:8]
GND
OUT[1:8]
Description
Input Supply Voltage, both pins should be externally connected on the PCB
to improve the internal current distribution and allow the device to safely
provide the maximum 2800mA of continuous supply current.
8 Logic Inputs, TTL, CMOS & High Voltage (12V) compatible. With all
inputs low the device is in sleep mode.
Ground, both pins should be externally connected externally on the PCB to
improve the internal current distribution and improve forward voltage of the
flyback clamping diodes.
700mA Source Outputs.
Block Diagram
V
S
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
V
S
1
20
GND
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
GND
2
19
3
18
4
17
5
6
Input
Level
Shift
Bias &
Controls
16
15
7
14
8
13
9
12
10
11
Figure 2 ·
AAHS298B Simplified Block Diagram
AAHS298B Rev. 1.4
3
Absolute Maximum Ratings
Absolute Maximum Ratings
Parameter
Supply Voltage (VS, Max voltage between VS and GND)
Digital Inputs (IN[1:8], Max voltage between INPUT & GND)
Output Voltage (OUT[1:8], Maximum voltage between OUT[1:8]
and GND)
Single Output Continuous Current (OUT[1:8])
Single Output Peak Current (OUT[1:8], ≤ 1 second)
Multiple Output Simultaneously Continuous Current (OUT[1:8])
ESD (all pins, HBM)
Operating Junction Range
Storage Temperature Range
Lead Temperature (Soldering, 10 Seconds)
Peak Package Solder Reflow Temp. (40 sec. max. exp.)
Lead Temperature. (Soldering 10 seconds)
Value
-0.5 to 75
-0.5 to 15
75
-700
-1200
-2800
2000
-55 to 150
-65 to 150
300
260 (+0, -5)
300
Units
V
V
V
mA
mA
mA
V
°C
°C
°C
°C
°C
Exceeding these ratings could cause damage to the device. All voltages are with respect to GND. Currents are positive into,
negative out of specified terminal. These are stress ratings only and functional operation of the device at these or any other
conditions beyond those indicated under “Recommended Operating Conditions” are not implied. Exposure to “Absolute Maximum
Ratings” for extended periods may affect device reliability.
Thermal Data
Parameter
S20 Package:
Thermal Resistance-Junction to Case, θ
JC
Value
2.24
Units
°C/W
Note: The θ
JC
number is for conduction only to the ceramic base of the package. It assumes that the ceramic base has a thermal
epoxy underneath the ceramic package to exhaust the heat from the package into the PCB, or other mounting surface.
AAHS298B Rev. 1.4
4
Electrical Characteristics
Electrical Characteristics
Unless otherwise stated the following specifications apply over operating ambient temperature of -55 C <
°
Temp < 125 C, V
S
= 50V, 100kRad (Si) TID (min), 50kRad (Si) ELDRS (min)
Symbol
Parameter
Test Condition
Test
Setup
Units
°
Min
Typ
1
5
7
Max
20
25
25
Operating Supply Current
I
SLEEP
I
VS2.5
I
VS5
Standby Supply Current
Active Supply Current
Active Supply Current
Output Turn On Delay
Time
Output Turn Off Delay
Time
Output Rise Time (10% to
90%)
Output Fall Time (90% to
10%)
Supply Voltage Range
Thermal Shutdown Trip
Temperature
Thermal Shutdown Reset
Temperature
Input High Level
3
Input Low Level
Output Saturation at
350mA
Output Saturation at
500mA
Output Saturation at
700mA
Input High Leakage
Input Low Leakage
Output Low Leakage
Clamp Diode Forward
Voltage
Clamp Diode Leakage
Current
IN[1:8] = 5.0V
5
I
IL
I
OL
V
F
I
R
IN[1:8] = 0.0V
Output OFF, VOUTX = 0.0V
I
F
= 200mA
7
I
F
= 700mA
V
R
= 50V
8
3.0
50
µA
6
0.1
2
10
50
2.5
V
µA
1.7
IN[1:8] = 2.5V
4
1.8
2.1
60
0.8
2.2
2.3
2.7
100
V
IN[1:8] = 0.0V, No Output Load
IN[1:8] = 2.5V, No Output Load
IN[1:8] = 5.0V, No Output Load
1
2
µA
mA
AC Characteristics
t
on
t
off
t
R
t
F
2
Load = 470Ω, 100pF, V
S
= 45V
V
IL
= 0.8; V
IH
= 2.5V
10
µs
2
10
DC Characteristics
V
S
THSD
TRIP
THSD
RST
V
IH
V
IL
VCE
SAT
VCE
SAT
VCE
SAT
I
IH
10
135
Restarts at 125ºC
125
2.5
155
50
175
ºC
V
AAHS298B Rev. 1.4
5
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