Renesas QS3VH2861QG8

Overview

QS3VH2861QG8 from Renesas Electronics (formerly IDT) is a 10-bit, high-bandwidth, bidirectional bus switch with flow-through pinout, active-low enable (BE), and rail-to-rail analog switching capability (0–5 V). It features 25 Ω typical ON resistance, 1.35 ns max propagation delay at 3.3 V, 5 V-tolerant I/Os, and operates from 2.3 V to 3.6 V supply. It is used in hot-swap interfaces and ATM switching systems requiring isolation under power-off conditions.

For engineers reviewing the QS3VH2861QG8 datasheet, QS3VH2861QG8 pinout, QS3VH2861QG8 application, or QS3VH2861QG8 equivalent, key selection criteria include its 5 V tolerance in both ON/OFF states, sub-2 ns propagation delay, flat R_ON vs. input voltage, low 4 pF OFF-state I/O capacitance, and industrial temperature range (–40°C to +85°C).

Technical Context

The QS3VH2861QG8 implements N-channel FET switches without parasitic diodes to V_CC, enabling true isolation during power-down and eliminating DC paths to V_CC or GND. Its control inputs are LVTTL-compatible with VIH/VIL thresholds specified across 2.3–3.6 V V_CC ranges.

It supports bidirectional signal flow with near-zero ground bounce, exhibits excellent R_ON matching between channels, and maintains rail-to-rail switching performance up to 5 V regardless of V_CC level-enabling interoperability between mixed-voltage domains in communications backplanes.

Key Specifications

Pinout & Package

QS3VH2861QG8 is housed in a 24-pin QSOP (Quarter-Size Outline Package), green RoHS-compliant variant (QG suffix), with 0.65 mm lead pitch and flow-through A/B pin arrangement for minimal trace skew.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16210DGGR and PI3CHD3245LEX, the QS3VH2861QG8 uniquely balances 2.5/3.3 V dual-supply flexibility, guaranteed 1.35 ns max delay, and full –40°C to +85°C qualification - making it optimal for telecom infrastructure and ruggedized hot-swap designs where voltage domain bridging and reliability are co-priorities.

Availability

QS3VH2861QG8 is available at Aetrix Electronics and suitable for hot-swappable backplanes, ATM switching systems, low-distortion analog multiplexing, and legacy-to-modern voltage domain bridging requiring stable component supply across extended temperature ranges.

Supply support for QS3VH2861QG8 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 QS3VH2861QG8 belongs to Renesas' QuickSwitch® family of high-speed bus switches, designed specifically for zero-downtime system architectures requiring hot-plug capability, rail-to-rail analog signal integrity, and mixed-voltage domain interoperability.

FAQ

What is the maximum operating frequency of the BE control input for QS3VH2861QG8?

The QS3VH2861QG8 supports a maximum BE toggle frequency of 20 MHz under specified test conditions (V_IN = 5 V, R_LOAD ≥ 1 MΩ, no C_LOAD). This rating ensures reliable enable/disable cycling in high-speed packet-switched applications such as ATM 155 Mbps interfaces. The QS3VH2861QG8 achieves this with sub-2 ns turn-on/turn-off delays and minimal dynamic current draw.

Does QS3VH2861QG8 support true 5 V tolerance on all I/O pins when V_CC is 2.5 V?

Yes, QS3VH2861QG8 guarantees 5 V tolerance on all A0–A9 and B0–B9 pins regardless of V_CC level (2.3–3.6 V), including at 2.5 V. This is enabled by its N-channel FET structure with no parasitic diode to V_CC, allowing safe connection to 5 V buses while powered from lower rails. The QS3VH2861QG8 datasheet explicitly specifies V_TERM(3) = –0.5 V to +5.5 V for all switch terminals.

What is the significance of the "flow-through pinout" in QS3VH2861QG8?

The flow-through pinout of QS3VH2861QG8 arranges A0–A9 and B0–B9 in sequential order across opposite sides of the QSOP package (e.g., A0/B0 adjacent, A1/B1 adjacent), minimizing trace length mismatch and skew in high-speed parallel buses. This physical layout directly supports matched-length routing for differential or parallel data paths - a key advantage over folded or interleaved pinouts in timing-critical applications like ATM switching.

Can QS3VH2861QG8 be used in analog signal paths requiring low THD?

Yes, QS3VH2861QG8 is suitable for low-THD analog multiplexing due to its flat R_ON vs. input voltage curve, absence of body-diode conduction, and rail-to-rail 0–5 V switching. Measured R_ON variation is <±10% across the full input range at 3.3 V V_CC, minimizing harmonic distortion in audio or sensor signal chains. The QS3VH2861QG8's 4 pF OFF-state capacitance also limits crosstalk in multi-channel analog routing.

Is there an exposed thermal pad on the QS3VH2861QG8 QSOP package?

No, the QS3VH2861QG8 in QSOP package (QG suffix) does not include an exposed thermal pad. Thermal dissipation relies on standard leadframe conduction through PCB copper. The device's low static current (ICCQ ≤ 4 mA) and low R_ON minimize self-heating; junction temperature rise remains within specification under typical industrial loads. No thermal pad reflow profile or solder mask opening is required for QS3VH2861QG8 assembly.