Renesas QS4A210QG

Overview

QS4A210QG from Renesas Electronics (formerly IDT) is a high-performance CMOS two-channel SP4T analog multiplexer/demultiplexer with individual enables, 5Ω rDS(ON), 700MHz –3dB bandwidth, and TTL-compatible control inputs. It operates from a single 5V supply across –40°C to +85°C and is used in HDTV video routing and high-speed telecom signal switching.

For engineers reviewing the QS4A210QG datasheet, QS4A210QG pinout, QS4A210QG application, or QS4A210QG equivalent, key selection criteria include channel isolation at 30MHz, transition time under 6.6ns, off-capacitance below 7.4pF, and support for bidirectional signal routing without level-shifting.

Technical Context

The QS4A210QG implements dual independent SP4T switch matrices with break-before-make control logic, enabling simultaneous but isolated routing of two analog signal paths. Each channel features matched on-resistance (5Ω typ.) and low charge injection (1.5pC), critical for precision data acquisition and zero-crosstalk video switching.

Its 700MHz bandwidth and –68dB crosstalk at 5MHz are achieved via optimized CMOS switch geometry and low-inductance QSOP packaging. The device supports both multiplexing and demultiplexing modes using S0/S1 select lines and EA/EB enables-no external biasing or power sequencing required.

Key Specifications

Pinout & Package

QS4A210QG is housed in a 16-pin Quarter Size Outline Package (QSOP), measuring 3.9mm × 4.9mm × 1.4mm, with gull-wing leads optimized for low parasitic inductance and reduced ground bounce in high-frequency layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with TMUX1308PWR and ADG1419BRUZ, the QS4A210QG uniquely delivers dual-channel 700MHz routing in a single QSOP package with sub-6ns switching and microamp quiescent draw-making it optimal for space-constrained, high-fidelity video and telecom infrastructure where timing fidelity and power efficiency are co-critical.

Availability

QS4A210QG is available at Aetrix Electronics and suitable for HDTV video routing, high-speed data acquisition, and telecom signal switching requiring stable component supply and long-term industrial temperature support.

Supply support for QS4A210QG 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 enterprise applications.

The QS4A210QG belongs to Renesas' legacy IDT analog switch portfolio, designed specifically for high-fidelity, high-bandwidth signal routing in broadcast video, test equipment, and wired communications infrastructure.

FAQ

What is the maximum analog signal voltage range supported by the QS4A210QG?

The QS4A210QG supports an analog input voltage range of –0.5V to V_CC–1V, which equals –0.5V to +4V when operated from a nominal 5V supply. This rail-to-rail compatible range allows direct interfacing with standard video and audio signals without external clamping or level-shifting circuitry. The device also tolerates transient overvoltages up to ±7V on all I/O pins, enhancing robustness in noisy environments. All specifications assume V_CC = 5V ±5% and operation across –40°C to +85°C.

Does the QS4A210QG support true bidirectional signal flow?

Yes, the QS4A210QG supports fully bidirectional analog signal routing on all Ix and Y ports - meaning it functions identically as a multiplexer (I→Y) or demultiplexer (Y→I) without requiring direction control signals or external biasing. This is confirmed by its symmetric rDS(ON), matched on-capacitance (12–15pF), and identical off-isolation/crosstalk specs regardless of signal direction. The internal CMOS switch architecture has no intrinsic polarity, enabling seamless integration in systems like loopback test paths or shared bus architectures where signal flow reverses dynamically.

What is the purpose of the break-before-make feature in the QS4A210QG?

The break-before-make feature in the QS4A210QG ensures that one switch path is fully disconnected before another is connected during state transitions - preventing momentary short-circuits between input sources. This behavior is implemented in the internal control logic driving the S0/S1 select lines and is critical in video routing applications where connecting two active sources (e.g., two HDMI transmitters) could cause contention, signal corruption, or damage. The feature operates automatically; no external timing constraints or delay circuits are needed to guarantee safe switching.

Can the QS4A210QG be used with 3.3V logic control signals?

Yes, the QS4A210QG accepts 3.3V logic levels on its EA, EB, S0, and S1 control inputs because its VIH threshold is guaranteed at ≥2.0V and VIL at ≤0.8V under industrial conditions - well within 3.3V CMOS logic margins. However, the analog signal path remains tied to the 5V V_CC supply, so input signals must stay within –0.5V to +4V. No level-shifter is required for control, but ensure system ground references are common between control logic and analog sections to avoid noise coupling into sensitive signal paths.

How does the QS4A210QG's off-isolation performance vary with frequency?

The QS4A210QG's off-isolation degrades predictably with frequency: –90dB at 50kHz, –60dB at 5MHz, and –50dB at 30MHz. This roll-off follows a typical capacitive coupling mechanism, as confirmed by the device's specified C_DEMUX(OFF) = 7.4pF. For applications requiring >60dB isolation above 5MHz - such as multi-source HD video switching - layout best practices (ground plane separation, guard traces, minimized trace length) are essential. The datasheet provides measured curves up to 1GHz, showing isolation remains >20dB even at 700MHz, sufficient for many broadband RF sampling applications.