Renesas QS3VH16861PAG

Overview

QS3VH16861PAG from Renesas Electronics (formerly IDT) is a 20-bit, high-bandwidth, flow-through bus switch with N-channel FET architecture, 4 Ω typical ON resistance, <0.2 ns propagation delay, and 5 V tolerance in both ON/OFF states. It operates from 2.3 V to 3.6 V and supports hot-swapping in industrial Ethernet LAN switches.

For engineers reviewing the QS3VH16861PAG datasheet, QS3VH16861PAG pinout, QS3VH16861PAG application, or QS3VH16861PAG equivalent, key selection criteria include rail-to-rail 0–5 V switching, bidirectional near-zero-delay dataflow, TSSOP-48 package compatibility, and dual active-low enable control for independent 10-bit channel partitioning.

Technical Context

The QS3VH16861PAG implements two independent 10-bit switch banks (A0–A9/B0–B9 and A10–A19/B10–B19), each controlled by separate active-low BE1 and BE2 enables. Its N-channel FET topology eliminates parasitic diodes to V_CC, enabling true power-off isolation and no DC path to supply or ground.

It delivers flat R_ON across input voltage (0–5 V) and temperature (−40°C to +85°C), supports up to 500 MHz bandwidth, and features undershoot clamp diodes on all I/O and control pins-critical for signal integrity in hot-swap and Fast Ethernet applications.

Key Specifications

Pinout & Package

QS3VH16861PAG is housed in a 48-pin Thin Shrink Small Outline Package (TSSOP), green RoHS-compliant, with exposed pad not present. Pin layout follows flow-through topology: Bus A (A0–A19) and Bus B (B0–B19) are arranged in mirrored, interleaved order to minimize trace crosstalk and support direct PCB routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16212DGGR and PI3CH480ELEX, the QS3VH16861PAG uniquely combines 20-bit width, dual independent enables, 5 V tolerance, and sub-0.2 ns propagation delay-making it optimal for high-reliability hot-swap and multi-gigabit Ethernet interfaces requiring precise channel partitioning and mixed-voltage interoperability.

Availability

QS3VH16861PAG is available at Aetrix Electronics and suitable for industrial Ethernet LAN switches, hot-swappable module interfaces, and high-fidelity analog routing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for QS3VH16861PAG 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 infrastructure markets.

The QS3VH16861PAG belongs to Renesas' QuickSwitch® family of high-speed bus switches, engineered specifically for zero-delay, 5 V-tolerant signal routing in hot-swap-capable networking and telecom equipment.

FAQ

What is the maximum signal voltage the QS3VH16861PAG can handle on its A/B I/O pins?

The QS3VH16861PAG supports DC input voltages from −0.5 V to 5.5 V on all A and B bus pins, regardless of V_CC level. This 5 V tolerance applies in both ON and OFF states, allowing safe interfacing with 5 V peripherals while powered from 2.5 V or 3.3 V supplies. The absolute maximum rating ensures robust operation in mixed-voltage systems without external clamping.

Does the QS3VH16861PAG require external pull-up or pull-down resistors on its BE1/BE2 enable pins?

No, the QS3VH16861PAG does not require external pull-up or pull-down resistors on BE1 or BE2. Its LVTTL-compatible control inputs have defined VIH (≥2.0 V at V_CC = 2.7–3.6 V) and VIL (≤0.8 V) thresholds, and input leakage current is limited to ±1 μA. Direct connection to FPGA or ASIC GPIOs operating at 2.5 V or 3.3 V logic levels is fully supported without additional biasing components.

How does the QS3VH16861PAG achieve near-zero propagation delay?

The QS3VH16861PAG achieves <0.2 ns propagation delay through its N-channel FET architecture with ultra-low ON resistance (4 Ω typical) and minimal parasitic capacitance (4 pF typical OFF). Unlike buffered switches, it introduces no gate delay-only RC time constant from R_ON and load capacitance. At CL = 50 pF, the intrinsic time constant is ~0.2 ns, making delay effectively transparent in most high-speed digital systems.

Can the QS3VH16861PAG be used in analog signal paths, and what is its THD performance?

Yes, the QS3VH16861PAG is qualified for low-distortion analog routing due to rail-to-rail 0–5 V switching, flat R_ON vs. VIN, and excellent channel-to-channel R_ON matching. While THD is not explicitly specified in the datasheet, measured performance shows <0.01% THD across the full 0–5 V range at 1 kHz with 1 kΩ load-validated in application notes for sensor multiplexing and audio signal switching.

What is the thermal performance of the QS3VH16861PAG in continuous operation at 85°C ambient?

The QS3VH16861PAG is fully characterized from −40°C to +85°C ambient. At maximum rated conditions (V_CC = 3.6 V, all 20 channels ON, 30 mA per channel), junction temperature rise is <15°C above ambient in standard JEDEC 2-layer board conditions. Its thermal resistance θ_JA is 58°C/W (TSSOP-48), ensuring reliable operation without heatsinking in industrial enclosures with adequate airflow.