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Product Detailed Parameters
- Description：TRANS 4NPN DARL 50V 1.8A 20-SO
- Series：-
- Mfr：STMicroelectronics
- Package：Tube
- Transistor Type：4 NPN Darlington (Quad)
- Current - Collector (Ic) (Max)：1.8A
- Voltage - Collector Emitter Breakdown (Max)：50V
- Vce Saturation (Max) @ Ib, Ic：1.6V @ 1.8A
- Current - Collector Cutoff (Max)：-
- DC Current Gain (hFE) (Min) @ Ic, Vce：-
- Power - Max：1W
- Frequency - Transition：-
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：20-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SO
- Grade：-
- Qualification：-
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Overview
The E-L6221AD is a monolithic quad Darlington switch manufactured by STMicroelectronics, designed for high current and high voltage switching applications. It features four non-inverting inputs controlled by a common enable input, with all inputs being TTL-compatible. The device integrates fast recirculation diodes and offers an output voltage up to 50 V and an output current of up to 1.8 A per channel. Key electrical parameters include a collector-emitter saturation voltage of 1.6 V at 1.8 A, a logic supply voltage range of 4.5 V to 5.5 V, and a maximum operating junction temperature of 150 °C. It is available in the SO16+2+2 package.
Feature Summary
- Four non-inverting drivers with a common enable control
- TTL-compatible logic inputs for direct connection to logic circuits
- Integral fast recirculation diodes for inductive loads
- Low saturation voltage for efficient power switching
Applications
- High current, high voltage switching applications
- Solenoid driver circuits
- Inductive load management
Procurement Notes
Verify the specific ordering suffix against the manufacturer's datasheet to confirm the exact package type and reel configuration. Confirm component availability status as older revisions may be obsolete. Ensure that the selected variant matches the required thermal and mechanical specifications for the target PCB layout.
Selection Notes
Select this component when driving inductive loads requiring high current switching capabilities. Consider the thermal resistance characteristics and ensure adequate heat sinking or copper area on the PCB to manage power dissipation within the specified limits. Verify that the logic supply voltage and input levels are compatible with the controlling microcontroller or logic circuit.
Part Context
The E-L6221AD belongs to the L6221 family of quad Darlington switches produced by STMicroelectronics. This family includes variants such as the Power DIP version (E-L6221AS) and tape-and-reel configurations (E-L6221AD013TR). The series is engineered for robust performance in industrial and automotive environments where reliable high-current switching is required.
Replacement Considerations
Direct replacements within the same product line include the E-L6221AS for through-hole mounting and the E-L6221AD013TR for automated surface-mount assembly. Both share identical electrical characteristics but differ in physical packaging and handling requirements.
