Renesas QS3L384QG8

Overview

QS3L384QG8 from Renesas Electronics is a high-speed, low-power 10-bit CMOS bus exchange switch with dual independent 5-bit enables (BEA/BEB), 5 Ω typical ON resistance, zero added propagation delay, and industrial temperature range (–40°C to +85°C); used for hot-swapping, voltage translation between 5V and 3.3V buses, and clock gating in embedded control systems.

For engineers reviewing the QS3L384QG8 datasheet, QS3L384QG8 pinout, QS3L384QG8 application, or QS3L384QG8 equivalent, key selection criteria include bidirectional switching capability, undershoot clamp diodes on all I/O and control pins, ultra-low quiescent current (0.2 μA typ), and QSOP-24 green package compatibility with legacy TTL-level logic interfaces.

Technical Context

The QS3L384QG8 implements ten independent N-channel FET switches without inherent body diode to V_CC, enabling true bidirectional signal flow with no DC path or level-shifting limitation. Its architecture supports simultaneous or selective connection of two 10-bit buses (A0–A9 and B0–B9) via two separate enable controls.

Each switch exhibits <7 Ω max ON resistance at V_CC = 5 V and 30 mA load, with input/output capacitance under 7 pF (switch OFF) and pass voltage ≥3.7 V at V_CC = 5 V, ensuring minimal signal degradation in high-speed digital interconnects.

Key Specifications

Pinout & Package

QS3L384QG8 is housed in a 24-pin Quarter Size Outline Package (QSOP), lead-free and RoHS-compliant (Green). Pin pitch is 0.635 mm; body dimensions are 8.65 mm × 3.90 mm × 1.35 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384CPWR and 74LVC1G3157GW,125, the QS3L384QG8 uniquely delivers 10-bit segmentation with independent 5-bit enables, sub-μA quiescent current, and integrated undershoot clamps-making it optimal for industrial hot-swap and multi-rail isolation where reliability and layout simplicity are critical.

Availability

QS3L384QG8 is available at Aetrix Electronics and suitable for hot-swapping systems, voltage translation interfaces, and power-gated embedded subsystems requiring stable component supply across extended industrial temperature ranges and long production lifecycles.

Supply support for QS3L384QG8 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 applications.

The QS3L384QG8 belongs to Renesas' QuickSwitch® family of high-speed bus switches, engineered specifically for zero-delay signal routing, hot-plug resilience, and low-power isolation in industrial control and modular computing platforms.

FAQ

What is the maximum operating voltage for QS3L384QG8?

The QS3L384QG8 supports a supply voltage (V_CC) range of 4.75 V to 5.25 V (5 V ±5%). Absolute maximum ratings allow DC voltages up to +7 V on all terminals except V_CC, but sustained operation above 5.25 V violates specification and risks reliability. The QS3L384QG8 must be operated within its characterized industrial range to guarantee 5 Ω R_ON, 0.25 ns max t_PLH, and undershoot clamp functionality.

Does QS3L384QG8 support bidirectional signal flow without direction control?

Yes, the QS3L384QG8 provides fully bidirectional signal conduction between A0–A9 and B0–B9 ports with no direction-control pin required. Each switch is an N-channel FET with no intrinsic body diode to V_CC, eliminating forward voltage drop and enabling true AC-coupled or mixed-voltage signal pass-through. This architecture makes the QS3L384QG8 ideal for I²C, SMBus, and other open-drain bidirectional protocols where external direction logic would add latency or complexity.

How does the dual-enable feature (BEA and BEB) improve system design flexibility?

The QS3L384QG8's dual-enable structure allows independent control of two 5-bit segments: BEA governs A0–A4/B0–B4, and BEB governs A5–A9/B5–B9. This enables granular bus partitioning-for example, gating clock and control lines separately from data lanes, or isolating faulted sections without disrupting entire communication paths. In practice, this reduces FPGA I/O usage, simplifies power-state sequencing, and improves fault containment in QS3L384QG8-based industrial backplanes.

Can QS3L384QG8 be used for 3.3V-to-5V level translation?

Yes, the QS3L384QG8 supports bidirectional voltage translation between 3.3 V and 5 V domains when V_CC = 5 V. Its TTL-compatible inputs accept 3.3 V logic HIGH (VIH ≥2 V), and its pass voltage (VP ≥3.7 V at V_CC = 5 V) ensures robust 3.3 V signal recognition on the 5 V side. However, the QS3L384QG8 does not regulate or shift voltage-it relies on source termination and load impedance matching; proper series resistors may be needed on 3.3 V drivers to avoid overvoltage stress.

What thermal considerations apply to QS3L384QG8 in high-density PCB layouts?

The QS3L384QG8 has a maximum power dissipation of 0.5 W at TA = 85°C and is rated for operation up to +85°C ambient. In high-density layouts, thermal relief on GND and V_CC pads, plus at least two thermal vias under the exposed pad (if present-though QSOP-24 lacks one), helps maintain junction temperature below 125°C. The QS3L384QG8's 0.2 μA typical I_CCQ minimizes self-heating, making thermal derating unnecessary unless >10 switches operate simultaneously at full 120 mA per pin.