Renesas QS3384QG8

Overview

QS3384QG8 from Renesas Electronics is a high-speed CMOS 10-bit bus switch with two independent 5-bit banks, 5 Ω typical ON resistance, zero propagation delay, and industrial temperature support (–40°C to +85°C). It enables bidirectional voltage translation between 5V and 3.3V buses in hot-swap-capable systems.

For engineers reviewing the QS3384QG8 datasheet, QS3384QG8 pinout, QS3384QG8 application, or QS3384QG8 equivalent, key selection factors include its dual-enable control architecture, undershoot clamp diodes on all I/Os, TTL-compatible logic thresholds, and QSOP-24 green package compliance for low-capacitance isolation in power-sensitive digital interfaces.

Technical Context

The QS3384QG8 implements ten independent N-channel FET switches without inherent body diodes to VCC, enabling true bidirectional signal flow with no DC path. Each switch bank (A0–A4/B0–B4 and A5–A9/B5–B9) is controlled by dedicated BEA and BEB inputs, supporting selective bus gating.

It operates at 5V ±5%, delivers pass voltage ≥3.7V at 5V supply, and maintains ≤7 Ω max ON resistance across temperature. Input leakage is ±1 μA, off-state current is ±1 μA, and dynamic supply current is 0.25 mA/MHz - optimized for low-noise, low-power digital interconnects.

Key Specifications

Pinout & Package

QS3384QG8 is housed in a 24-pin QSOP (Quarter Size Outline Package), green RoHS-compliant, with 0.635 mm pitch and standard JEDEC MO-137AC footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switch applications.

Compared with SN74CBT3384CPWR and 74LVC1G3157GW, the QS3384QG8 uniquely combines integrated undershoot clamps, strict 5V-only operation for predictable timing, and native dual-bank enable control - making it optimal for industrial hot-swap and voltage-translation applications requiring robustness and deterministic behavior.

Availability

QS3384QG8 is available at Aetrix Electronics and suitable for hot-swapping, voltage translation, and clock gating applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.

Supply support for QS3384QG8 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT markets.

The QS3384QG8 belongs to Renesas' QuickSwitch® family of high-speed bus switches, designed specifically for low-latency, low-noise digital interconnects in industrial and telecom infrastructure where signal integrity and hot-plug resilience are critical.

FAQ

What is the maximum operating voltage for QS3384QG8?

The QS3384QG8 supports a supply voltage (VCC) of 5V ±5%, with absolute maximum ratings of –0.5 V to +7 V on all terminals except VCC. Its DC input and switch voltages are rated to +7 V, enabling safe operation with transient overvoltage up to that limit. The device is not rated for continuous operation above 5.25 V, and exceeding this may impact timing or reliability. Always refer to the DC Electrical Characteristics table in the official QS3384QG8 datasheet for validated operating conditions.

Does QS3384QG8 support bidirectional signal flow?

Yes, QS3384QG8 supports fully bidirectional signal flow across all ten channels. Each switch is implemented using an enhanced N-channel FET without an inherent body diode to VCC, eliminating unidirectional conduction paths. This allows signals to pass from A0–A9 to B0–B9 or vice versa with identical ON resistance (5 Ω typ.) and timing characteristics, making it ideal for data bus isolation and voltage translation in either direction.

What package type is used for QS3384QG8?

QS3384QG8 is packaged in a 24-pin QSOP (Quarter Size Outline Package), designated "QG" in the ordering code. It is green (lead-free/RoHS-compliant), has a 0.635 mm lead pitch, and conforms to JEDEC MO-137AC mechanical specifications. This package provides compact footprint and thermal performance suitable for industrial PCB layouts with moderate density and airflow.

How does QS3384QG8 handle undershoot transients?

QS3384QG8 integrates undershoot clamp diodes on all switch (A0–A9, B0–B9) and control (BEA, BEB) inputs, limiting negative excursions to –0.5 V under DC conditions and –3 V for ≤20 ns pulses. This protects internal circuitry during hot-plug events or connector arcing without requiring external diodes. The clamps operate independently per pin and do not affect normal logic operation or ON-resistance performance.

Can QS3384QG8 be used for 5V to 3.3V level translation?

Yes, QS3384QG8 is explicitly qualified for 5V ↔ 3.3V voltage translation. Its TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), 5 Ω ON resistance, and guaranteed pass voltage of 3.7–4.2 V at 5V supply ensure reliable logic-level compatibility. When driven by a 3.3V source into a 5V domain, the switch passes the signal with minimal drop; when driven from 5V into 3.3V, the receiving device sees valid HIGH levels well above its VIH threshold. No external biasing is required.