CPC7581BATR

Telecom Overview

The CPC7581BATR is a monolithic solid-state four-pole line card access switch manufactured by IXYS Integrated Circuits Division. It operates on a single +5 V supply with power consumption under 10 mW and supports battery voltages from -19 V to -72 V. The device features low on-resistance break switches (SW1/SW2) and high-voltage ringing switches (SW3/SW4). It includes integrated protection via current limiting, thermal shutdown at 110°C, and an internal SCR for overvoltage clamping. Packaged in a 16-pin SOIC, it replaces electromechanical relays in telecom equipment.

Telecom Feature Summary

• Monolithic solid-state construction providing bounce-free switching without external zero-cross circuitry
• Integrated tertiary protection including active current limiting, thermal shutdown, and diode bridge/SCR clamping
• Flexible switch timing allowing configurable make-before-break or break-before-make operation during state transitions
• Latched logic-level inputs that eliminate the need for external drive circuitry

Telecom Applications

• Central office (CO) line cards
• Digital Loop Carrier (DLC) systems
• PBX Systems
• Digitally Added Main Line (DAML)
• Hybrid Fiber Coax (HFC) interfaces

Telecom Procurement Notes

Verify the specific suffix 'B' indicates the absence of the protection SCR and 'TR' confirms tape and reel packaging. Confirm RoHS compliance status as per the latest manufacturer documentation. Ensure secondary protectors are selected to work with the integrated fault steering mechanisms.

Telecom Selection Notes

Select this component when replacing Form-C relays in analog or IVD line cards requiring low power dissipation. Verify if the integrated SCR protection is required; if not, consider the variant without the SCR. Ensure the application voltage range aligns with the specified -19 V to -72 V battery input capabilities.

Telecom Part Context

This part belongs to the CPC7581 family of line card access switches designed to replace electromechanical relays. The 'B' suffix denotes the version without the integrated protection SCR, while 'TR' specifies the tape and reel delivery method. It is functionally compatible with Legerity products in the SOIC package form factor.

Telecom Replacement Considerations

CPC7581BAR

Telecom FAQ

How does the CPC7581 handle ringing switch turn-off?

The ringing switch SW4 utilizes a zero-cross current turn-off mechanism. It delays state change until the next zero-current crossing to reduce impulse noise, meaning it should not be used to switch pure DC signals.

What triggers the thermal shutdown feature?

Thermal shutdown activates when the die temperature reaches a minimum of 110°C, forcing all switches to the all-off state. The TSD pin outputs a nominal 0 V during this condition.

Is external driver circuitry required for control inputs?

No, the CPC7581 features latched logic-level inputs that do not require external drive circuitry. The LATCH pin controls whether the INRINGING input is transparent or latched.