GN1157-INE3

Overview

The GN1157-INE3 is a multi-rate laser driver IC designed for data communication and telecommunications applications. It supports transmission rates from 1.0 Gbps to 11.3 Gbps, covering Ethernet and Fibre Channel standards. The device features a typical power dissipation of 185 mW and operates on a single 3.3 V supply with a maximum operating current of 120 mA. It utilizes a 28-pin QFN package measuring 4 mm x 4 mm. Key electrical parameters include a maximum bias current of 120 mA and a modulation current drive capability of 92 mAppd into a 15 Ohm differential resistance.

Feature Summary

• Integrates an automatic power control loop to adjust bias current for laser aging and environmental compensation
• Features programmable equalization to optimize jitter performance
• Includes Tx output with programmable rise/fall times for bit rate optimization
• Compatible with external microcontroller look-up tables for temperature and lifetime management

Applications

• Long Reach (LR) Ethernet applications
• Fibre Channel systems
• Data center interconnects
• Telecommunications infrastructure

Procurement Notes

Verify the specific suffix INE3 against official Semtech documentation to confirm lead-free status and RoHS compliance. Confirm that the component is available in tape and reel packaging as specified. Check for end-of-life notifications or obsolescence warnings prior to procurement. Ensure the ordering code matches the exact pinout and thermal requirements of the target design.

Selection Notes

Select this component for designs requiring high-performance laser driving with integrated power control. It is suitable for applications needing support for multiple data rates up to 11.3 Gbps. Consider the 28-pin QFN footprint for space-constrained PCB layouts. Evaluate the need for microcontroller integration if advanced temperature compensation is required.

Part Context

The GN1157 belongs to Semtech’s GN11 series of laser drivers and transceivers. This family targets optical communications systems using Silicon Germanium BiCMOS and CMOS technologies. The series covers various signaling formats including NRZ and PAM4 for markets such as data centers and wireless infrastructure.

Replacement Considerations

GN1157-INTE3Z is a verified tape-and-reel variant of the same functional part number.