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ULN2003AIDRG4 View Datasheet(PDF) - Texas Instruments

Part NameULN2003AIDRG4 Texas-Instruments
Texas Instruments Texas-Instruments
DescriptionHigh-Voltage, High-Current Darlington Transistor Arrays
ULN2003AIDRG4 Datasheet PDF : 33 Pages
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ULN2002A, ULN2003A, ULN2003AI
ULQ2003A, ULN2004A, ULQ2004A
8.3 Feature Description
Each channel of the ULN2003A device consists of Darlington connected NPN transistors. This connection
creates the effect of a single transistor with a very high-current gain (β2). This can be as high as 10,000 A/A at
certain currents. The very high β allows for high-output current drive with a very low input current, essentially
equating to operation with low GPIO voltages.
The GPIO voltage is converted to base current through the 2.7-kΩ resistor connected between the input and
base of the predriver Darlington NPN. The 7.2-kΩ and 3-kΩ resistors connected between the base and emitter of
each respective NPN act as pulldowns and suppress the amount of leakage that may occur from the input.
The diodes connected between the output and COM pin is used to suppress the kick-back voltage from an
inductive load that is excited when the NPN drivers are turned off (stop sinking) and the stored energy in the
coils causes a reverse current to flow into the coil supply through the kick-back diode.
In normal operation the diodes on base and collector pins to emitter will be reversed biased. If these diodes are
forward biased, internal parasitic NPN transistors will draw (a nearly equal) current from other (nearby) device
8.4 Device Functional Modes
8.4.1 Inductive Load Drive
When the COM pin is tied to the coil supply voltage, ULN2003A device is able to drive inductive loads and
suppress the kick-back voltage through the internal free-wheeling diodes.
8.4.2 Resistive Load Drive
When driving a resistive load, a pullup resistor is needed in order for ULN2003A device to sink current and for
there to be a logic high level. The COM pin can be left floating for these applications.
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Product Folder Links: ULN2002A ULN2003A ULN2003AI ULQ2003A ULN2004A ULQ2004A
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The ULx200xA devices are high-voltage, high-current Darlington transistor arrays. Each consists of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads.
The collector-current rating of a single Darlington pair is 500 mA. The Darlington pairs can be paralleled for higher current capability. Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers, and logic buffers. For 100-V (otherwise interchangeable) versions of the ULx2003A devices, see the SLRS023 data sheet for the SN75468 and SN75469 devices.
The ULN2002A device is designed specifically for use with 14-V to 25-V PMOS devices. Each input of this device has a Zener diode and resistor in series to control the input current to a safe limit. The ULx2003A devices have a 2.7-kΩ series base resistor for each Darlington pair for operation directly with TTL or 5-V CMOS devices.
The ULx2004A devices have a 10.5-kΩ series base resistor to allow operation directly from CMOS devices that use supply voltages of 6 V to 15 V. The required input current of the ULx2004A device is below that of the ULx2003A devices, and the required voltage is less than that required by the ULN2002A device.

• 500-mA-Rated Collector Current (Single Output)
• High-Voltage Outputs: 50 V
• Output Clamp Diodes
• Inputs Compatible With Various Types of Logic
• Relay-Driver Applications

• Relay Drivers
• Stepper and DC Brushed Motor Drivers
• Lamp Drivers
• Display Drivers (LED and Gas Discharge)
• Line Drivers
• Logic Buffers


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