Renesas QS32X245Q2G8

Overview

QS32X245Q2G8 from Renesas Electronics is a high-speed CMOS double-width bus switch with 16 bidirectional channels, 5Ω typical ON resistance, zero propagation delay, and TTL-compatible control inputs. It operates across –40°C to +85°C and supports voltage translation between 5V and 3.3V buses in hot-swap-capable industrial backplanes.

For engineers reviewing the QS32X245Q2G8 datasheet, QS32X245Q2G8 pinout, QS32X245Q2G8 application, or QS32X245Q2G8 equivalent, key selection criteria include guaranteed sub-0.25ns max propagation delay, dual OE control for independent 8-bit bus segments, undershoot clamp diodes on all I/Os, and QVSOP-40 packaging for high-density PCB layouts.

Technical Context

The QS32X245Q2G8 implements two independent 8-bit bidirectional switch banks (A0–A7/B0–B7 and A8–A15/B8–B15), each controlled by separate OE pins (OE1, OE2). Its enhanced N-channel FET architecture eliminates inherent body diode conduction to Vcc, enabling true bidirectional signal flow without DC path constraints.

Each channel exhibits 5Ω typical ON resistance at VCC = 5V and VIN = 0V, delivering <0.25ns propagation delay contribution under 50pF load-limited only by external driver/load RC time constants. Undershoot clamp diodes protect all switch and control inputs down to –3V, supporting robust hot-plug operation.

Key Specifications

Pinout & Package

QS32X245Q2G8 is packaged in a 40-pin QVSOP (Quad Very Small Outline Package) with 0.5mm pitch, optimized for high-density routing and thermal performance in industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3245APWR and PI3CH400QE, the QS32X245Q2G8 uniquely combines dual independent OE control, integrated undershoot clamps, 5V I/O tolerance, and industrial temperature qualification-making it optimal for mission-critical hot-swap and voltage-translation applications where reliability and design flexibility are paramount.

Availability

QS32X245Q2G8 is available at Aetrix Electronics and suitable for industrial backplane interfaces, hot-swappable module designs, and mixed-voltage logic interfacing requiring stable component supply and long-term lifecycle support.

Supply support for QS32X245Q2G8 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 specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and infrastructure markets.

The QS32X245Q2G8 belongs to Renesas' QuickSwitch® bus switch family, engineered for zero-delay, low-R_ON signal routing in high-reliability industrial and communications systems requiring hot-swap capability and voltage domain bridging.

FAQ

What is the maximum operating voltage for QS32X245Q2G8?

The QS32X245Q2G8 supports an absolute maximum supply voltage (VCC) of +7V and DC input voltages from –0.5V to +7V on all terminals except VCC. Its recommended operating range is 5.0V ±5%, and it tolerates –3V undershoot transients on all I/O and control pins due to integrated clamp diodes. This makes QS32X245Q2G8 suitable for mixed-voltage environments and hot-swap applications where voltage excursions may occur.

Does QS32X245Q2G8 support independent control of its two 8-bit bus segments?

Yes, QS32X245Q2G8 features two independent active-low enable inputs-OE1 controls the A0–A7/B0–B7 segment, and OE2 controls the A8–A15/B8–B15 segment. This allows selective isolation of either 8-bit group without affecting the other, enabling flexible bus partitioning in modular systems. The QS32X245Q2G8's dual-OE architecture is critical for applications like redundant data paths or segmented backplane arbitration.

Is QS32X245Q2G8 compatible with 3.3V logic levels when powered by 5V?

Yes, QS32X245Q2G8 is fully compatible with 3.3V logic levels on its A and B ports while operating from a 5V supply. Its TTL-compatible control inputs accept VIH ≥ 2V and VIL ≤ 0.8V, and its bidirectional switches pass signals without level shifting-enabling seamless 5V-to-3.3V voltage translation. This behavior is intrinsic to the QS32X245Q2G8's passive FET switch architecture and requires no external components.

What package type does QS32X245Q2G8 use, and what are its key mechanical features?

QS32X245Q2G8 uses a 40-pin QVSOP (Quad Very Small Outline Package) with 0.5mm lead pitch and exposed pad for thermal enhancement. It measures 10.2mm × 5.6mm × 1.2mm and features gull-wing leads compatible with standard SMT reflow processes. The QVSOP package supports high I/O density and improved thermal dissipation over standard SOIC, making it ideal for compact industrial modules where the QS32X245Q2G8 performs bus isolation or clock gating.

How does QS32X245Q2G8 achieve zero propagation delay in practice?

QS32X245Q2G8 achieves effectively zero propagation delay because its FET-based switches contribute only an RC time constant (~0.25ns for 50pF load), far smaller than typical driver rise/fall times. The datasheet specifies ≤0.25ns max tPLH/tPHL-meaning the QS32X245Q2G8 adds no measurable delay beyond the inherent interconnect and driver characteristics. This enables transparent signal pass-through in high-speed digital systems where timing budgets are tight.