Renesas HXT5004A-DNT

Overview

HXT5004A-DNT from Integrated Device Technology (IDT) is a 4-channel VCSEL driver IC for high-speed optical transmitters, delivering 10 Gb/s per channel with 5 mA average and 5 mA modulation current, QSFP MSA compliance, and operation from 0°C to +95°C in bare die form. It performs full digital-to-optical conversion with CML input interface, laser drive control, and supervision for compact SR4 modules.

For engineers reviewing the HXT5004A-DNT datasheet, HXT5004A-DNT pinout, HXT5004A-DNT application, or HXT5004A-DNT equivalent, key selection criteria include per-channel power (46 mW), VCSEL cathode configuration support, 2-wire interface control, and bare-die package integration into multi-channel optical assemblies.

Technical Context

The HXT5004A-DNT integrates four independent CML-input laser drivers optimized for 10 Gb/s NRZ signaling, each supporting common-cathode and isolated VCSEL arrays. Its symmetric pad layout and solder-bump-ready bare-die construction enable direct flip-chip mounting in QSFP-compliant optical subassemblies.

It implements on-chip drive control and supervision logic with 2-wire serial interface for channel enable/disable, bias/modulation current adjustment, and temperature monitoring-no external microcontroller required for basic operation. Compliance with IEEE 802.3ba, InfiniBand QDR/FDR, and 40GBASE-SR4 standards confirms interoperability in standardized 40G optical links.

Key Specifications

Pinout & Package

Bare die package with solder bumps; dimensions 2.05 mm × 1.67 mm; designed for flip-chip mounting onto substrate or interposer. No leadframe or molded body - requires underfill and controlled reflow profile.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar VCSEL driver applications.

Compared with MAX3999A and SN65LVPE502, the HXT5004A-DNT uniquely combines quad-channel integration, embedded 2-wire control, and MSA-compliant optical drive capability in a bare-die form factor-enabling single-component transmitter assembly without external supervision logic or channel multiplexing.

Availability

HXT5004A-DNT is available at Aetrix Electronics and suitable for 40G optical transceivers, InfiniBand active cables, and proprietary multi-channel optical modules requiring stable component supply and bare-die integration capability.

Supply support for HXT5004A-DNT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory interface, and optical interconnect ICs for datacenter and communications infrastructure.

The HXT5004A product line delivers compact, low-power VCSEL drivers targeting QSFP-compliant 40G optical modules-designed specifically to replace discrete driver + MCU solutions in SR4 and active cable applications.

FAQ

What is the operating temperature range specified for the HXT5004A-DNT?

The HXT5004A-DNT is rated for operation from 0°C to +95°C ambient temperature. This range aligns with commercial-grade requirements for pluggable optical transceivers such as QSFP+ modules used in data center switches and servers. The bare-die construction requires thermal management via substrate conduction, and performance specifications-including 10 Gb/s data rate and 46 mW per channel power-are guaranteed across this full range. The HXT5004A-DNT datasheet confirms thermal derating is not required within these limits.

Does the HXT5004A-DNT support both common-cathode and isolated VCSEL arrays?

Yes, the HXT5004A-DNT explicitly supports both common-cathode and isolated VCSEL array configurations. Its output architecture allows flexible connection to either topology without external circuitry changes. This dual compatibility is documented in the IDT Product Brief and enables module designers to qualify multiple VCSEL suppliers or migrate between array types without redesigning the driver interface. The HXT5004A-DNT achieves this through independently configurable bias and modulation paths per channel.

What interface does the HXT5004A-DNT use for configuration and supervision?

The HXT5004A-DNT uses a 2-wire serial interface (I²C-compatible SCL/SDA) for global configuration and per-channel supervision. This interface controls functions including channel enable/disable, bias current setting, modulation current scaling, and temperature monitoring. Unlike discrete driver solutions requiring dedicated GPIO or SPI controllers, the HXT5004A-DNT integrates all supervision logic on-die-reducing firmware overhead and PCB complexity. The HXT5004A-DNT's 2-wire implementation is fully compliant with QSFP MSA management requirements.

Is the HXT5004A-DNT supplied in a packaged IC format or bare die?

The HXT5004A-DNT is supplied exclusively as a bare die in waffle pack packaging, measuring 2.05 mm × 1.67 mm. It is not offered in any leaded or laminate package variant. This bare-die form enables direct flip-chip mounting onto high-density substrates used in optical modules, minimizing parasitic inductance and improving signal integrity at 10 Gb/s. The HXT5004A-DNT requires underfill and controlled reflow processing, consistent with industry-standard optical subassembly practices.

Which industry standards does the HXT5004A-DNT comply with?

The HXT5004A-DNT complies with QSFP MSA, InfiniBand QDR/FDR, and IEEE 802.3ba 40GBASE-SR4 standards. These certifications confirm its interoperability in standardized 40G optical links-including eye diagram, jitter, and extinction ratio requirements. Compliance is verified through IDT's characterization reports and is integral to the HXT5004A-DNT's qualification for use in commercial transceivers and active cables. The HXT5004A-DNT meets all electrical and thermal specifications mandated by these standards across its full operating temperature range.