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Product Detailed Parameters
- Description：TRANS 7NPN DARL 50V 0.5A 16DIP
- Series：ULx200xA
- Mfr：Texas Instruments
- Package：Bulk,Tube
- Transistor Type：-
- Current - Collector (Ic) (Max)：-
- Voltage - Collector Emitter Breakdown (Max)：-
- Vce Saturation (Max) @ Ib, Ic：-
- Current - Collector Cutoff (Max)：-
- DC Current Gain (hFE) (Min) @ Ic, Vce：-
- Power - Max：-
- Frequency - Transition：-
- Operating Temperature：-40°C ~ 105°C (TA)
- Mounting Type：Through Hole
- Package / Case：16-DIP (0.300", 7.62mm)
- Supplier Device Package：16-PDIP
- Grade：-
- Qualification：-
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Overview
The ULN2004AIN is a high-voltage, high-current Darlington transistor array manufactured by Texas Instruments. It consists of seven NPN Darlington pairs with common-cathode clamp diodes for switching inductive loads. Each pair features a 10.5-kΩ series base resistor, enabling direct operation with TTL or 5-V CMOS logic devices. The collector current rating per single output is 500 mA, and the maximum collector-emitter voltage is 50 V. The device operates within an ambient temperature range of -40°C to 105°C and is housed in a 16-pin PDIP (N) package.
Feature Summary
- Integrated 10.5-kΩ series base resistors for each channel allow direct interfacing with standard logic families without external components.
- Common-cathode clamp diodes are included on all outputs to suppress voltage spikes generated by inductive loads during switching.
- High-voltage outputs rated at 50 V support the control of heavy-duty loads such as relays and solenoids.
Applications
- Relay drivers
- Hammer drivers
- Lamp drivers
- Display drivers (LED and gas discharge)
- Line drivers and logic buffers
Procurement Notes
Verify the specific ordering suffix against the manufacturer's latest documentation to confirm the package type and material finish. Confirm that the component status remains active for production use before finalizing design-in decisions. Ensure compliance with RoHS directives if required by the target application environment.
Selection Notes
Select this component when driving inductive loads directly from TTL or 5-V CMOS logic sources. The integrated base resistors simplify circuit design by eliminating the need for external current-limiting resistors. Consider paralleling multiple channels if higher total current capacity than 500 mA is required for a single load.
Part Context
This part belongs to the ULN200xA family of high-voltage Darlington arrays. While functionally similar to other members like the ULN2003A, the ULN2004A variant includes internal base resistors for each channel, facilitating easier integration with digital logic circuits compared to versions requiring external resistors.
Replacement Considerations
ULN2004AID
FAQ
What is the purpose of the internal resistors in the ULN2004AIN?
Each Darlington pair contains a nominal 10.5-kΩ series base resistor. This allows the inputs to be driven directly by TTL or 5-V CMOS logic signals without requiring external current-limiting resistors.
How does the ULN2004AIN handle inductive load flyback?
The device features common-cathode clamp diodes connected to the COM pin. These diodes provide a path for the reverse current generated by inductive loads, protecting the transistors from voltage spikes.
Can the output current capability be increased?
Yes, the individual Darlington pairs can be paralleled to achieve higher current handling capabilities beyond the single-channel 500 mA rating.
