Renesas QS3VH16800PAG

Overview

QS3VH16800PAG from Renesas Electronics (formerly IDT) is a 20-bit high-bandwidth bus switch with precharged B-port outputs, designed for hot-swap and live-insertion applications. It features 4 Ω typical ON resistance, <250 ps propagation delay, 5V-tolerant I/Os in both ON/OFF states, and user-selectable VBIAS for noise suppression - deployed in Fast Ethernet LAN switches and modular backplane interconnects.

For engineers reviewing the QS3VH16800PAG datasheet, QS3VH16800PAG pinout, QS3VH16800PAG application, or QS3VH16800PAG equivalent, key selection criteria include its rail-to-rail 0–5 V switching capability, LVTTL-compatible OE control, 500 MHz bandwidth, and TSSOP-48 package compatibility with industrial temperature operation (−40°C to +85°C).

Technical Context

The QS3VH16800PAG implements dual 10-bit N-channel FET bus switches with no parasitic diode to VCC, enabling true isolation under power-off conditions and eliminating DC paths to VCC or GND. Its architecture supports bidirectional data flow with near-zero added delay and no ground bounce.

Each switch channel delivers flat R_ON over voltage and temperature, with 4 pF typical I/O capacitance (OFF), 8–12 pF (ON), and guaranteed 5V tolerance on all A/B terminals regardless of VCC state - critical for mixed-voltage system interfacing and hot-plug robustness.

Key Specifications

Pinout & Package

TSSOP-48 package with 0.5 mm pitch, thermally enhanced for high-density PCB layouts and industrial thermal cycling reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16210DGGR and PI3CH480ELEX, the QS3VH16800PAG uniquely combines 20-bit width, user-configurable VBIAS precharge, sub-250 ps delay, and true 5V tolerance - making it the only option qualified for zero-downtime hot-swap in industrial Ethernet and telecom backplanes.

Availability

QS3VH16800PAG is available at Aetrix Electronics and suitable for industrial backplane interfaces, Fast Ethernet switch fabric routing, and hot-swappable module interconnects requiring stable component supply across extended temperature and long product lifecycles.

Supply support for QS3VH16800PAG 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 QS3VH16800PAG belongs to Renesas' legacy QuickSwitch® bus switch family, originally developed by IDT to address high-speed, low-noise interconnect needs in modular, hot-pluggable systems - especially telecom and enterprise networking equipment.

FAQ

What is the maximum operating frequency supported by the QS3VH16800PAG?

The QS3VH16800PAG supports up to 500 MHz bandwidth for analog/digital signal switching. Its enable input (OEx) toggle frequency is rated to 20 MHz at VCC = 3.3 V. The device's near-zero propagation delay (<250 ps) and flat R_ON ensure minimal signal degradation even at these frequencies, making QS3VH16800PAG suitable for Fast Ethernet and high-speed parallel bus applications.

Does the QS3VH16800PAG require external pull-up or pull-down resistors on its control inputs?

No, the QS3VH16800PAG does not require external pull-up or pull-down resistors on OE1/OE2 inputs. Its LVTTL-compatible control inputs have defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds across the full VCC range (2.3–3.6 V), and input leakage is limited to ±1 μA. This allows direct interfacing with standard logic drivers without additional biasing components - a key design simplification in QS3VH16800PAG implementations.

How does the VBIAS pin function in the QS3VH16800PAG, and what voltage range is supported?

The VBIAS pin in the QS3VH16800PAG sets the precharge voltage for all B-port outputs during the OFF state, suppressing live-insertion noise. It accepts 0–5 V (with 0–3.3 V typical at 2.3–2.7 V VCC; 0–5 V at 3.3–3.6 V VCC). When left open, VBIAS defaults to ~2.4 V via internal 5 kΩ bias resistor. This programmable precharge is a defining feature of QS3VH16800PAG not found in most competing bus switches.

Is the QS3VH16800PAG pin-compatible with other devices in the QS3VH family?

Yes, the QS3VH16800PAG shares identical pinout and footprint with other 48-pin TSSOP variants in the QS3VH family (e.g., QS3VH16245, QS3VH245), including matching A/B port assignments, OE placement, and VBIAS location. However, functional differences exist - such as channel count, precharge capability, and R_ON - so electrical validation is required before substitution. The QS3VH16800PAG remains the only 20-bit variant with VBIAS support in this package.

What is the thermal performance of the QS3VH16800PAG in continuous operation?

The QS3VH16800PAG is characterized for continuous operation from −40°C to +85°C (industrial grade) with no derating required. Its TSSOP-48 package exhibits a junction-to-ambient thermal resistance (θ_JA) of ~120°C/W. At typical quiescent current (1.5 mA) and 30 mA per channel worst-case conduction, self-heating remains below 5°C - ensuring stable R_ON and timing behavior across the full temperature range specified for QS3VH16800PAG.