Features
Built using the advantages and compatibility
of CMOS and IXYS HDMOSTM processes.
Latch Up Protected
High Peak Output Current: 9A Peak
Operates from 4.5V to 35V
-55° C to 125° C Extended Operating Temperature
Standard
Ability to Disable Output under Faults
• High Capacitive Load
Drive Capability: 2500pF in <15ns
• Matched Rise And Fall Times
• Low Propagation Delay Time
Low Output Impedance
Low Supply Current
Applications
Driving MOSFETs and IGBTs
Motor Controls
Line Drivers
Pulse Generators
Local Power ON/OFF Switch
Switch Mode Power Supplies (SMPS)
DC to DC Converters
Pulse Transformer Driver
Limiting di/dt under Short Circuit
Class D Switching Amplifiers
First Release
Copyright © IXYS CORPORATION 2004 Patent Pending
General Description
The IXDD409/IXDI409/IXDN409 are high speed high current gate
drivers specifically designed to drive the largest MOSFETs and
IGBTs to their minimum switching time and maximum practical
frequency limits. The IXDD409/IXDI409/IXDN409 can source and
sink 9A of peak current while producing voltage rise and fall
times of less than 30ns. The input of the drivers are compatible
with TTL or CMOS and are fully immune to latch up over the
entire operating range. Designed with small internal delays,
cross conduction/current shoot-through is virtually eliminated in
the IXDD409/IXDI409/IXDN409. Their features and wide safety
margin in operating voltage and power make the drivers
unmatched in performance and value.
The IXDD409 incorporates a unique ability to disable the output
under fault conditions. When a logical low is forced into the
Enable input, both final output stage MOSFETs (NMOS and
PMOS) are turned off. As a result, the output of the IXDD409
enters a tristate mode and achieves a Soft Turn-Off of the
MOSFET/IGBT when a short circuit is detected. This helps
prevent damage that could occur to the MOSFET/IGBT if it were to
be switched off abruptly due to a dv/dt over-voltage transient.
The IXDN409 is configured as a non-inverting gate driver, and
the IXDI409 is an inverting gate driver.
The IXDD409/IXDI409/IXDN409 are available in the standard 8-pin
P-DIP (PI), SOIC-8 (SI), 5-pin TO-220 (CI) and in the TO-263 (YI)
surface-mount packages.
Figure 1A - IXDD409 (Non Inverting With Enable) Diagram
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
9 Ampere Low-Side Ultrafast MOSFET Driver
Figure 1B - IXDN409 (Non-Inverting) Diagram
Figure 1C - IXDI409 (Inverting) Diagram
Part Number Package Type Temp. Range Configuration
IXDD409PI 8-Pin PDIP
IXDD409SI 8-Pin SOIC
IXDD409YI 5-Pin TO-263
IXDD409CI 5-Pin TO-220
-55°C to +125°C N on In ve rting
With Enab le Line
IXDI409PI 8-Pin PDIP
IXDI409SI 8-Pin SOIC
IXDI409YI 5-Pin TO-263
IXDI409CI 5-Pin TO-220
-55°C to +125°C Inverting
IXDN409PI 8-Pin PDIP
IXDN409SI 8-Pin SOIC
IXDN409YI 5-Pin TO-263
IXDN409CI 5-Pin TO-220
-55°C to +125°C N on In ve rting
Ordering Information
DS99054B(08/04)
2
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
Unless otherwise noted, TA = 25 oC, 4.5V VCC 35V .
All voltage measurements with respect to GND. IXDD409 configured as described in Test Conditions.
Electrical Characteristics
Symbol Parameter Test Conditions Min Typ Max Units
VIH High input voltage 4.5V VCC 18V 3.5 V
VIL Low input voltage 4.5V VCC 18V 0.8 V
VIN Input voltage range -5 VCC + 0.3 V
IIN Input current 0V VIN VCC
-10 10
µA
VOH High output voltage VCC - 0. 025 V
VOL Low output voltage 0.025 V
ROH Output resistance
@ Output high IOUT = 10mA, VCC = 18V
0.8 1.5
ROL Output resistance
@ Ou tp ut L o w IOUT = 10mA, VCC = 18 V 0. 8 1. 5
IPEAK Peak output current VCC is 18V
9 A
IDC Continuous output
current Limited by package power
dissipation 2 A
VEN Enable voltage range IXDD409 Only - .3 Vcc + 0.3 V
VENH High En Input V olt age IXDD409 Only 2/3 Vcc V
VENL Low En Input Volt age IXDD409 Only 1/3 Vcc V
tR Rise time CL=2500pF Vcc=18V 8 10 15 ns
tF Fall time CL=2500pF Vcc=18V 8 10 15 ns
tONDLY On-time propagation
delay CL=2500pF Vcc=18V 33 36 40 ns
tOFFDLY Off-time propagation
delay CL=2500pF Vcc=18V 31 33 36 ns
tENOH Enable t o output high
delay time IXDD409 Onl y , Vc c=18V 52 ns
tDOLD Disable to output l ow
Disable de la y t ime IXDD409 Onl y , Vc c=18V 30 ns
VCC Power supply voltage 4.5 18 35 V
ICC Power supply cu rr ent VIN = 3.5V
VIN = 0V
VIN = + VCC
1
0 3
10
10
mA
µA
µA
Absolute Maximum Ratings (Note 1) Operating Ratings
Specifications Subject To Change Without Notice
Parameter
V
alue
Supply Voltage 40V
All Othe r Pins -0.3 V to V CC + 0.3V
Junction Temperature 150oC
Storage Temperature -55oC to 150oC
Soldering Lead Temperature (10s) 300oC
Tab T emperature (10s) 260oC
Thermal Resistance (To Ambient)
8 Pin PDIP (PI) (θJA) 120 K/W
8 Pin SOIC (SIA) 110 K/W
TO-220 (CI) 50 K/W
θJA with heat sink **
Heat sink area of 1 cm2
8 Pin SOIC 95 K/W
TO-263 95 K/W
Heat sink area of 3 cm2
8 Pin SOIC 85 K/W
TO-263 85 K/W
** Device soldered to metal back pane. Heat sink area is 1 oz.
copper on 1 side of 0.06" thick FR4 PC board.
Parameter Value
Operating Temperature Range -55 oC to 125 oC
Thermal Resistance (Junction to Case) (θJC)
8 Pin PDIP (PI)
8 Pin SOIC (SI)
TO-220 (CI), TO-263 (YI) 2.5 K/W
70 K/W
10 K/W
3
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
Pin Description
SYMBOL FUNCTION DESCRIPTION
VCC Supply Voltage
Positive power-supply voltage input. This pin provides power to the
entire chip. The range for this voltage is from 4.5V to 35V.
IN Input Input signal-TTL or CMOS co mpatible.
EN * Enable The s ystem enabl e pi n. T his pin, when dri ven l ow, disa bles the c hip,
forcing high impedance state to the output (IXDD409 Only).
OUT Output
Driver Output. For application purposes, this pin is connected,
through a resistor, to Gate of a MOSFET/IGBT.
GND Ground
The system ground pin. Internally connected to all circuitry, this pin
provides ground reference for the entire chip. This pin should be
connected to a low noise analog ground plane for optimum
performance.
Figure 2 - Characteristics Test Diagram
* This pin is used only on the IXDD409, and is N/C on the IXDI409 and IXDN409.
Note 1: Operating the device beyond parameters with listed “absolute maximum ratings” may cause permanent
damage to the device. Typical values indicate conditions for which the device is intended to be functional, but do not
guarantee specific performance limits. The guaranteed specifications apply only for the test conditions listed.
Exposure to absolute maximum rated conditions for extended periods may affect device reliability.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper ESD procedures
when handling and assembling this component.
V
IN
8 PIN DIP (PI)
SO8 (SI) TO220 (CI)
TO263 (YI)
Vcc
OUT
GND
IN
EN *
1
2
3
4
5
Pin Configurations
VCC
IN
EN *
GND
VCC
OUT
GND
OUT
1
2
3
4
8
7
6
5
4
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
Typical Performance Characteristics
Fig. 3 Fig. 4
Fig. 5 Fig. 6
Fig. 7 Fig. 8
Rise T imes vs. Supply Volt a g e
0
5
10
15
20
25
30
35
40
8 9 10 11 12 13 14 15 16 17 18
Supply Voltage (V)
Rise Tim e (ns)
2950
p
F
5860 pF
8900 pF
1190 0 pF
1500 pF
Rise Time vs. Load Capacitance
5
10
15
20
25
30
35
1.35 2.7 5.4 8.1 10.8
Load C apacitance
Rise time (ns)
8V
10V
12V
14V
16V
1
8
V
Fall Times vs. Supply Voltage
0
5
10
15
20
25
30
8 9 10 11 12 13 14 15 16 17 18
Supply Voltage (V)
Fall Times (ns)
5860 pF
2950 pF
8900 pF
11900 p F
1500 pF
Fall Time vs. Load Capacitance
5
7
9
11
13
15
17
19
21
23
25
1.35 2.7 5.4 8.1 10.8
Load Capacitance (nF)
Fall Time (ns)
8V
10V
12V
14V
16V
1
8
V
Rise And Fall Times vs. Temperature
CL=2500pF, Vcc=18V
0
2
4
6
8
10
12
-40-200 25406085
Temperature
Time (ns)
Ri se time
Fall time
Max / M in Input vs. Tem per ature
0
0.5
1
1.5
2
2.5
3
3.5
-40-20 0 25406085
Temperature
Max / Min Input (V)
Minimum Input Low
Maximum Input High
5
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
Fig. 9 Fig. 10
Fig. 11 Fig. 12
Fig. 13 Fig. 14
Supply Curr ent vs. Load Capacitance
Vcc = 18V
0.1
1
10
100
1000
1000 10000
Load Capaci t anc e ( pF )
Supply Current ( m A )
10kHz
50kHz
1 MHz
2 MH z
100kHz
500kHz
Supply Current vs. Load Capacitance
Vcc = 12V
0.1
1
10
100
1000
1000 10000
Load Capacitance (pF)
Supply Current (mA )
10kHz
50kHz
100kHz
1MHz
2MHz
500kHz
Suppl y Current vs. Load C apaci t ance
Vcc = 8V
0.1
1
10
100
1000
1000 10000
Load Capaci t ance ( pF)
Supply Current (mA )
10kHz
50kHz
100kHz
500kHz
1MHz
2MHz
Supply Current vs. Frequency
Vcc = 12V
0.01
0.1
1
10
100
1000
1 10 100 1000 10000
Fr e que ncy (kHz)
Supply Current (mA)
1350
p
F
2700
p
F
5400
p
F
8100
p
F
10800
p
F
Suppl y Current vs. Frequency
Vcc = 8V
0.01
0.1
1
10
100
1000
1 10 100 1000 10000
Fr eq uenc y ( kH z)
Supply Current (mA )
1350 pF
2700 pF
5400 pF
8100 pF
10800 pF
Supply Current vs. Frequency
Vcc = 18V
0.1
1
10
100
1000
1 10 100 1000 10000
Frequency (kHz)
Supply Current (mA )
1350 pF
2700 pF
5400 pF
8100 pF
10800 pF
6
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
Fig. 15 Fig. 16
Fig. 17 Fig. 18
Fig. 19 Fig. 20
Propagation Delay vs. Supply Voltage
30
32
34
36
38
40
42
44
46
48
50
8 9 10 11 12 13 14 15 16 17 18
Supply Voltage (V )
Propagation Delay (ns)
Tondly (D D 4 09, DN409)
Tof f d l y (DI 4 09)
Toffdly( DD409, DN409)
Tondly (DI409)
Propagation Delay vs. Input Voltage
30
32
34
36
38
40
42
44
46
48
50
3456789101112
I np ut V oltag e (V)
Propagation Delay (ns)
To ndl y (DD40 9, DN40 9)
Toffdl y ( DI 409)
Toffdl y ( DD409, DN409)
Tondly (DI409)
Pr opagation Delay Times vs. Junction Tem perature
0
5
10
15
20
25
30
35
40
45
-40-200 25406085
Temperature (C)
Time (ns)
Tondly (DD409, DN 409)
Toffdly (DI409)
Toffdly (DD409, DN 409)
Tondly (DI409)
Qui escent Supply Current vs. Junction Temperature
Vcc=1 8v Vin=5v@1kHz
0
0.1
0.2
0.3
0.4
0.5
0.6
-40 -20 0 25 40 60 85
Temperature (C)
Quiescent Supply Current (mA)
Vcc vs. P Channel Peak Out put Cu r r ent
CL = 10 nF
-14
-12
-10
-8
-6
-4
-2
0
5 7.5 10 12.5 15 17.5 20 22.5 25
Vcc ( V)
P Channel Peak Output Current (A)
Vcc vs. N Channel Peak Output C ur rent
CL=10 nF
0
2
4
6
8
10
12
14
16
18
20
5 7.5 10 12.5 15 17.5 20 22.5 25
Vcc ( V)
N
Ch
anne
l
P
ea
k
O
utput
C
urrent
(A)
7
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
Figure 25 - Typical Application Short Circuit di/dt Limit
Fig. 21 Fig. 22
Fig. 23 High State O utput Resist ance vs. Supply Vol tage
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
5 7.5 10 12.5 15 17.5 20 22.5 25
Supply Voltage (V)
High Stat e Output Resistance (Ohms)
Low State Output Resistance vs. Supply Voltage
0
0.2
0.4
0.6
0.8
1
1.2
5 7.5 10 12.5 15 17.5 20 22.5 25
Supply Vol tage (V)
Low State Out put Resistance (Ohms)
Fig. 24
P C hannel O utput Cur r ent vs. Tem peratur e
Vcc = 18V CL = 10 nF
8
8.2
8.4
8.6
8.8
9
9.2
9.4
9.6
9.8
10
-60 -40 -20 0 20 40 60 80 100
Tem perat ure (C )
P
Ch
anne
l
O
u
t
pu
t
C
urren
t
(A)
N C hannel Peak Ouput Curr ent vs. Temper ature
Vcc = 18V CL = 10 nF
10
10.5
11
11.5
12
12.5
13
13.5
14
14.5
15
-60 -40 -20 0 20 40 60 80 100
Tem peratur e (C)
8
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
Short Circuit di/dt Limit
A short circuit in a high-power MOSFET module such as the
VM0580-02F, (580A, 200V), as shown in Figure 25, can cause
the current through the module to flow in excess of 1500A for
10µs or more prior to self-destruction due to thermal runaway.
For this reason, some protection circuitry is needed to turn off
the MOSFET module. However, if the module is switched off
too fast, there is a danger of voltage transients occuring on the
drain due to Ldi/dt, (where L represents total inductance in
series with drain). If these voltage transients exceed the
MOSFET's voltage rating, this can cause an avalanche break-
down.
The IXDD409 has the unique capability to softly switch off the
high-power MOSFET module, significantly reducing these
Ldi/dt transients.
Thus, the IXDD409 helps to prevent device destruction from
both dangers; over-current, and avalanche breakdown due to
di/dt induced over-voltage transients.
The IXDD409 is designed to not only provide ±9A under normal
conditions, but also to allow it's output to go into a high
impedance state. This permits the IXDD409 output to control
a separate weak pull-down circuit during detected overcurrent
shutdown conditions to limit and separately control dVGS/dt gate
turnoff. This circuit is shown in Figure 26.
Referring to Figure 26, the protection circuitry should include
a comparator, whose positive input is connected to the source
of the VM0580-02. A low pass filter should be added to the input
of the comparator to eliminate any glitches in voltage caused
by the inductance of the wire connecting the source resistor to
ground. (Those glitches might cause false triggering of the
comparator).
The comparator's output should be connected to a SRFF(Set
Reset Flip Flop). The flip-flop controls both the Enable signal,
and the low power MOSFET gate. Please note that CMOS 4000-
series devices operate with a VCC range from 3 to 15 VDC, (with
18 VDC being the maximum allowable limit).
A low power MOSFET, such as the 2N7000, in series with a
resistor, will enable the VMO580-02F gate voltage to drop
gradually. The resistor should be chosen so that the RC time
constant will be 100us, where "C" is the Miller capacitance of
the VMO580-02F.
For resuming normal operation, a Reset signal is needed at
the SRFF's input to enable the IXDD409 again. This Reset can
be generated by connecting a One Shot circuit between the
IXDD409 Input signal and the SRFF restart input. The One Shot
will create a pulse on the rise of the IXDD409 input, and this
pulse will reset the SRFF outputs to normal operation.
When a short circuit occurs, the voltage drop across the low-
value, current-sensing resistor, (Rs=0.005 Ohm), connected
between the MOSFET Source and ground, increases. This
triggers the comparator at a preset level. The SRFF drives a low
input into the Enable pin disabling the IXDD409 output. The
SRFF also turns on the low power MOSFET, (2N7000).
In this way, the high-power MOSFET module is softly turned off
by the IXDD409, preventing its destruction.
APPLICATIONS INFORMATION
Figure 26 - Application Test Diagram
10uH
Ld
0.1ohm
Rd
Rs
20nH
Ls
1ohm
Rg
10kohm
R+
VMO580-02F
Hi
g
h
_
Power
5kohm
Rcom
p
100
p
F
C+
+
-
V+
V-
Com
p
LM339
1600ohm
Rsh
Ccom
p
1pF
VCC
VCCA
IN
EN
GND
OUT
IXDD409
+
-
VIN
+
-
VCC
+
-
REF
+
-
VB
CD4001A
NOR2
1Mohm
Ros
NOT2
CD4049A
CD4011A
NAND
CD4049A
NOT1
CD4001A
NOR1
CD4049A
NOT3
Low
_
Power
2N7002/PLP
1pF
Cos
0
S
R
EN
Q
One Sh o t Ci rc u i t
SR Flip-Flop
GND
9
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
When designing a circuit to drive a high speed MOSFET
utilizing the IXDD409/IXDI409/IXDN409, it is very important to
keep certain design criteria in mind, in order to optimize
performance of the driver. Particular attention needs to be paid
to Supply Bypassing, Grounding, and minimizing the Output
Lead Inductance.
Say, for example, we are using the IXDD409 to charge a
5000pF capacitive load from 0 to 25 volts in 25ns…
Using the formula: I= V C / t, where V=25V C=5000pF &
t=25ns we can determine that to charge 5000pF to 25 volts
in 25ns will take a constant current of 5A. (In reality, the charging
current won’t be constant, and will peak somewhere around
8A).
SUPPLY BYPASSING
In order for our design to turn the load on properly, the IXDD409
must be able to draw this 5A of current from the power supply
in the 25ns. This means that there must be very low impedance
between the driver and the power supply. The most common
method of achieving this low impedance is to bypass the
power supply at the driver with a capacitance value that is a
magnitude larger than the load capacitance. Usually, this
would be achieved by placing two different types of bypassing
capacitors, with complementary impedance curves, very close
to the driver itself. (These capacitors should be carefully
selected, low inductance, low resistance, high-pulse current-
service capacitors). Lead lengths may radiate at high frequency
due to inductance, so care should be taken to keep the lengths
of the leads between these bypass capacitors and the IXDD409
to an absolute minimum.
GROUNDING
In order for the design to turn the load off properly, the IXDD409
must be able to drain this 5A of current into an adequate
grounding system. There are three paths for returning current
that need to be considered: Path #1 is between the IXDD409
and it’s load. Path #2 is between the IXDD409 and it’s power
supply. Path #3 is between the IXDD409 and whatever logic
is driving it. All three of these paths should be as low in
resistance and inductance as possible, and thus as short as
practical. In addition, every effort should be made to keep these
three ground paths distinctly separate. Otherwise, (for
instance), the returning ground current from the load may
develop a voltage that would have a detrimental effect on the
logic line driving the IXDD409.
OUTPUT LEAD INDUCTANCE
Of equal importance to Supply Bypassing and Grounding are
issues related to the Output Lead Inductance. Every effort
should be made to keep the leads between the driver and it’s
load as short and wide as possible. If the driver must be placed
farther than 2” from the load, then the output leads should be
treated as transmission lines. In this case, a twisted-pair
should be considered, and the return line of each twisted pair
should be placed as close as possible to the ground pin of the
driver, and connect directly to the ground terminal of the load.
Supply Bypassing and Grounding Practices,
Output Lead inductance
The enable (EN) input to the IXDD409 is a high voltage
CMOS logic level input where the EN input threshold is ½ VCC,
and may not be compatible with 5V CMOS or TTL input levels.
The IXDD409 EN input was intentionally designed for
enhanced noise immunity with the high voltage CMOS logic
levels. In a typical gate driver application, VCC =15V and the
EN input threshold at 7.5V, a 5V CMOS logical high input
applied to this typical IXDD409 application’s EN input will be
misinterpreted as a logical low, and may cause undesirable
or unexpected results. The note below is for optional
adaptation of TTL or 5V CMOS levels.
The circuit in Figure 27 alleviates this potential logic level
misinterpretation by translating a TTL or 5V CMOS logic input
to high voltage CMOS logic levels needed by the IXDD409 EN
input. From the figure, VCC is the gate driver power supply,
typically set between 8V to 20V, and VDD is the logic power
supply, typically between 3.3V to 5.5V. Resistors R1 and R2
form a voltage divider network so that the Q1 base is
positioned at the midpoint of the expected TTL logic transition
levels.
A TTL or 5V CMOS logic low, VTTLLOW=~<0.8V, input applied to
the Q1 emitter will drive it on. This causes the level translator
output, the Q1 collector output to settle to VCESATQ1 +
VTTLLOW=<~2V, which is sufficiently low to be correctly
interpreted as a high voltage CMOS logic low (<1/3VCC=5V for
VCC =15V given in the IXDD409 data sheet.)
A TTL high, VTTLHIGH=>~2.4V, or a 5V CMOS high,
V5VCMOSHIGH=~>3.5V, applied to the EN input of the circuit in
Figure 27 will cause Q1 to be biased off. This results in Q1
collector being pulled up by R3 to VCC=15V, and provides a
high voltage CMOS logic high output. The high voltage CMOS
logical EN output applied to the IXDD409 EN input will enable
it, allowing the gate driver to fully function as an 8 Amp output
driver.
The total component cost of the circuit in Figure 27 is less
than $0.10 if purchased in quantities >1K pieces. It is
recommended that the physical placement of the level
translator circuit be placed close to the source of the TTL or
CMOS logic circuits to maximize noise rejection.
Figure 27 - TTL to High Voltage CMOS Level Translator
TTL to High Voltage CMOS Level Translation
(IXDD409 Only)
10K R3
3.3K R2
Q1
2N3904
EN
Output
CC
(From Gate Driver
Pow er Su p ply )
Input)
TTL
CMOS
3.3K R1
V
DD
(From Logic
Power Supply)
or
High Volt age
(To IX DD409
EN Input)
10
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
IXYS Semiconductor GmbH
Edisonstrasse15 ; D-68623; Lampertheim
Tel: +49-6206-503-0; Fax: +49-6206-503627
e-mail: marcom@ixys.de
IXYS Corporation
3540 Bassett St; Santa Clara, CA 95054
Tel: 408-982-0700; Fax: 408-496-0670
www.ixys.com
e-mail: sales@ixys.net
Package Outlines
NOTE: Mounting or solder tabs on all packages are connected to ground
8-PIN PDIP (IXD_409PI) 8-PIN SOP (IXD_409SI)
5-Lead TO-263 (IXD_409YI) 5-Lead TO-220 (IXD_409CI)