MD-004HRL

Overview

The MD-004HRL is a Thinnet Transceiver module from HALO Electronics, designed as a complete on-board solution compliant with ANSI/IEEE802.3 and ISO8802-3 standards for Thin Net applications. It integrates all transceiver functions into a single package featuring squelch circuits to eliminate noise on signal inputs. The unit operates at a nominal voltage of 3.3V ±5% with a maximum input ripple of 100mVpp at 20MHz. Maximum operating current is 340mA within an industrial temperature range of 0°C to +70°C. Storage temperature spans -40°C to +125°C. This specific variant includes the optional Heartbeat function enable/disable capability.

Feature Summary

• Integrates complete Thin Net transceiver functions in a single package
• Includes squelch circuits on all signal inputs to eliminate noise
• Features optional Heartbeat (SQE) test enable/disable functionality

Applications

• Backplane Applications
• Network Interface Cards
• 10BASE-T Hub with 10BASE2 Interface
• Thin Net Transceivers

Procurement Notes

Verify the exact ordering suffix against official HALO Electronics documentation before purchase. Confirm that the 3.3V supply requirement matches your system design. Ensure the Heartbeat feature configuration aligns with your network topology requirements. Request updated availability status directly from the manufacturer or authorized distributors.

Selection Notes

Select this model when a 3.3V logic interface is required for Thinnet connectivity. Choose the MD-004HRL over the MD-003HRL specifically if the application requires the ability to enable or disable the SQE heartbeat test via pin control. Verify that the 340mA current draw fits within your power budget constraints.

Part Context

This component belongs to the HALO TnT family of Thin Net Transceiver modules. The family utilizes the H83C92 transceiver chip developed by HALO to ensure long-term availability despite industry discontinuations of traditional ICs. The series offers various voltage options including 5V, 3.3V, and 12V configurations.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult HALO Electronics support for potential cross-references or updated module replacements.