HCPL-4100

Overview

The HCPL-4100 is a single-channel, 8-pin DIP isolated transmitter designed for 20 mA current loop applications. It features logic input compatibility with LSTTL, TTL, and CMOS standards. The device provides high common-mode rejection via an internal shield. Key electrical parameters include a typical rise time of 16 ns, a typical fall time of 23 ns, and a maximum forward voltage of 20 V. It supports a data rate of 20 kBaud over 400 meters. The isolation voltage is rated at 3750 V AC, operating within a temperature range of -40°C to 85°C.

Feature Summary

• Designed specifically as an isolated transmitter for 20 mA current loop systems
• Compatible with LSTTL, TTL, and CMOS logic inputs
• Internal shielding ensures high common-mode rejection

Applications

• Simplex point-to-point 20 mA current loop transmission
• Multi-drop applications using current loop optocouplers
• Industrial equipment requiring isolated signal transmission

Procurement Notes

Verify the specific ordering suffix (e.g., -000E) to confirm package type and compliance status. Ensure the component matches the required isolation voltage and operating temperature range for the target environment. Confirm that the 20 mA loop interface aligns with the system design specifications before procurement.

Selection Notes

Select this component when an isolated transmitter is required for standard 20 mA current loops. It is suitable for interfacing digital logic outputs to industrial communication lines. Consider the 20 kBaud data rate limit and the 400-meter line capability when evaluating system performance requirements against other available optocoupler options.

Part Context

The HCPL-4100 belongs to the Broadcom HCPL series of optocouplers. It functions as the transmitter counterpart to receivers like the HCPL-4200 in current loop architectures. This component enables galvanic isolation between control logic and industrial field wiring while maintaining signal integrity over long distances.

Replacement Considerations

HCPL-4200 serves as the complementary receiver in paired designs. Verify pinout compatibility if substituting with other 8-pin DIP isolators. Ensure any replacement maintains the 20 mA loop drive capability and similar isolation ratings.