Renesas QS32X861Q1G8

Overview

QS32X861Q1G8 from Renesas Electronics (formerly IDT) is a high-speed CMOS 20-bit bus switch with flow-through pinout, featuring dual 10-bit bidirectional channels, 5 Ω typical ON resistance, zero propagation delay, and industrial temperature range (–40°C to +85°C). It enables hot-swapping, voltage translation between 5V and 3.3V buses, and dynamic bus isolation in digital systems.

For engineers reviewing the QS32X861Q1G8 datasheet, QS32X861Q1G8 pinout, QS32X861Q1G8 application, or QS32X861Q1G8 equivalent, key selection criteria include bidirectional switching capability, undershoot clamp diodes on all I/O and control pins, guaranteed logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), and QVSOP-48 package compatibility for space-constrained PCB layouts.

Technical Context

The QS32X861Q1G8 implements two independent 10-bit CMOS bus switches using enhanced N-channel FETs with no inherent body diode to VCC-enabling true bidirectional signal flow without forward-bias risk. Each channel is controlled by a dedicated Bus Enable (BE1/BE2) input, supporting per-bus gating.

It operates at VCC = 5.0 V ±5%, supports DC input voltages from –0.5 V to +7 V, and delivers pass voltage VP of 3.7–4.2 V under 5 V supply. Switching is characterized with tPLH/tPHL < 0.25 ns (typical), tPZH/tPHZ < 6.5 ns (max), and off-state leakage IOZ ≤ ±1 μA across temperature.

Key Specifications

Pinout & Package

QS32X861Q1G8 is packaged in a 48-pin QVSOP (Quad Flat No-Lead, Very Small Outline Package) with exposed thermal pad, optimized for low-inductance, flow-through routing and board-level signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3245APWR and PI3CH400QE, the QS32X861Q1G8 uniquely provides dual 10-bit banks with independent enables, 5V operation, and factory-characterized undershoot clamping-making it optimal for industrial hot-swap and mixed-voltage bus isolation where timing predictability and ruggedness are mandatory.

Availability

QS32X861Q1G8 is available at Aetrix Electronics and suitable for hot-swapping interfaces, 5V-to-3.3V voltage translation, and bus isolation applications requiring stable component supply, long-term industrial qualification, and RoHS-compliant green packaging.

Supply support for QS32X861Q1G8 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, infrastructure, and IoT applications.

The QS32X861Q1G8 belongs to Renesas' QuickSwitch® family of high-speed bus switches, designed specifically for low-latency, bidirectional digital signal routing in mixed-voltage and hot-plug-capable systems.

FAQ

What is the maximum operating voltage for QS32X861Q1G8?

The QS32X861Q1G8 supports a supply voltage (VCC) range of 4.75 V to 5.25 V. Its absolute maximum ratings allow DC voltages up to +7 V on all terminals except VCC, and –0.5 V minimum, enabling robust handling of transient overvoltage conditions. This specification ensures reliable operation in noisy industrial 5 V environments and compatibility with legacy TTL signaling levels.

Does QS32X861Q1G8 support hot-swap functionality?

Yes, the QS32X861Q1G8 is explicitly designed for hot-swapping and hot-docking applications. Its undershoot clamp diodes protect all I/O and control pins against –3 V transients (≤20 ns), and its zero-propagation-delay switching prevents bus contention during insertion. The dual independent BE controls allow staged enable sequencing, making QS32X861Q1G8 suitable for PCIe-like add-in card interfaces and modular backplane systems.

What package type is used for QS32X861Q1G8?

QS32X861Q1G8 is supplied in a 48-pin QVSOP (Quad Flat No-Lead, Very Small Outline Package) with flow-through pinout. This package features a compact footprint, exposed thermal pad, and optimized leadframe geometry to minimize inductance and support high-speed signal integrity. Pin compatibility is confirmed per the official Renesas datasheet DSC-5730/4, and the package is RoHS-compliant and green (lead-free).

Can QS32X861Q1G8 translate between 5V and 3.3V logic levels?

Yes, QS32X861Q1G8 enables bidirectional DC-coupled voltage translation between 5V and 3.3V domains. Its 5 Ω typical ON resistance and 3.7–4.2 V pass voltage (VP) at 5 V supply ensure clean signal transfer without level-shifting circuitry. When driven from a 5V source, the output swing remains compatible with 3.3V CMOS inputs; conversely, 3.3V inputs safely drive the switch without violating VIH/VIL thresholds. This makes QS32X861Q1G8 ideal for bridging legacy and modern logic families.

How many independent enable controls does QS32X861Q1G8 have?

QS32X861Q1G8 has two independent Bus Enable inputs: BE1 controls the lower 10-bit channel (A0–A9 ↔ B0–B9), and BE2 controls the upper 10-bit channel (A10–A19 ↔ B10–B19). This allows granular bus segmentation-for example, enabling memory address lines separately from data lines, or isolating control and status buses independently. Both BE inputs are active-low and feature TTL-compatible thresholds.