Renesas QS3390QG8

Overview

QS3390QG8 from Renesas Electronics (formerly IDT) is a high-speed CMOS 16:8 bidirectional analog multiplexer with zero propagation delay, 5Ω ON-resistance, and industrial temperature range (–40°C to +85°C), used for video/audio signal routing, hot-swap interfaces, and 5V-to-3.3V voltage translation in embedded systems.

For engineers reviewing the QS3390QG8 datasheet, QS3390QG8 pinout, QS3390QG8 application, or QS3390QG8 equivalent, key selection criteria include guaranteed sub-0.25 ns propagation delay, ±1 μA input leakage, 5Ω typical R_ON, undershoot clamp diodes on all I/Os, and QSOP-28 package compatibility with legacy QuickSwitch designs.

Technical Context

The QS3390QG8 implements a dual-bus 16:8 multiplexer using enhanced N-channel FET switches with no inherent body diode to V_CC, enabling true bidirectional signal flow without DC blocking or level-shifting constraints. Its architecture supports simultaneous A→AB and B→AB switching via independent AEN/BEN enables.

It operates at 5V ±5% with TTL-compatible control inputs (V_IL ≤ 0.8 V, V_IH ≥ 2 V), delivers <6.5 ns turn-on/turn-off delays, and maintains <±1 μA off-state leakage across –40°C to +85°C - critical for low-noise analog and mixed-signal routing.

Key Specifications

Pinout & Package

QS3390QG8 is housed in a 28-pin Quarter Size Outline Package (QSOP) with 0.65 mm lead pitch and exposed pad not present. Pin numbering follows standard top-view orientation with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16212DGGR and PI3CH480QS, the QS3390QG8 uniquely combines 16:8 channel density, industrial temperature support, undershoot clamping, and sub-0.25 ns delay - making it the only option for high-reliability video/audio multiplexing in harsh environments.

Availability

QS3390QG8 is available at Aetrix Electronics and suitable for video signal routing, hot-swappable peripheral interfaces, and 5V-to-3.3V voltage translation requiring stable component supply across industrial design cycles.

Supply support for QS3390QG8 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 QS3390QG8 belongs to Renesas' legacy QuickSwitch® analog switch portfolio, designed specifically for zero-delay, low-R_ON, bidirectional signal routing in mixed-voltage and hot-swap-capable systems.

FAQ

What is the maximum operating voltage for QS3390QG8?

The QS3390QG8 supports a terminal voltage range of –0.5 V to +7 V across all pins except V_CC, allowing safe operation with 5V logic and transient undershoot down to –3 V. V_CC is specified at 5V ±5%, and the device is not rated for continuous operation above 5.25 V on the supply rail. This voltage tolerance enables robust interfacing between 5V and 3.3V domains without level shifters. The QS3390QG8's undershoot clamp diodes activate below –0.5 V, protecting internal circuitry during hot-plug events.

Does QS3390QG8 support bidirectional signal flow?

Yes, the QS3390QG8 supports fully bidirectional analog signal flow between A/B buses and the AB bus due to its enhanced N-channel FET architecture with no inherent body diode to V_CC. Signals pass equally well from A0→AB0 or AB0→A0 when AEN is active low, and similarly for B-side paths. This eliminates directionality constraints found in traditional logic-based muxes and enables use in DDR memory bus sharing or reconfigurable test fixtures. The QS3390QG8's bidirectional capability is intrinsic to its switch topology and requires no external biasing or control sequencing.

What is the typical ON-resistance of QS3390QG8 and how does it affect signal integrity?

The QS3390QG8 has a typical ON-resistance of 5 Ω at V_CC = 5 V and 30 mA current, with a maximum of 7 Ω over temperature and voltage. This low R_ON minimizes insertion loss and preserves rise/fall times in high-frequency signals such as HDMI pixel clocks or DDR strobes. When driving a 50 pF load, the resulting RC time constant is ~0.25 ns - matching the device's specified propagation delay ceiling. The QS3390QG8's R_ON stability across –40°C to +85°C ensures consistent signal fidelity in industrial environments.

Can QS3390QG8 be used for voltage translation between 5V and 3.3V systems?

Yes, the QS3390QG8 is explicitly qualified for 5V-to-3.3V voltage translation due to its rail-to-rail I/O voltage tolerance (–0.5 V to +7 V), absence of internal level-shifting circuitry, and bidirectional conduction. It passes signals without DC blocking or logic inversion, making it suitable for translating control lines, I²C buses, or analog sensor outputs. Unlike active translators, the QS3390QG8 introduces no propagation delay or power supply dependencies. Its use in voltage translation is validated in the original IDT application notes and confirmed by the QS3390QG8's DC electrical characteristics table.

Is QS3390QG8 pin-compatible with earlier IDT QuickSwitch devices?

The QS3390QG8 uses the same QSOP-28 footprint and pinout as the original IDT QS3390, including identical A0–A7, B0–B7, AB0–AB7, AEN, BEN, V_CC, and GND assignments. Renesas maintains full mechanical and electrical compatibility for drop-in replacement in legacy designs. No PCB layout changes are required when upgrading from IDT-branded QS3390 to QS3390QG8. The QS3390QG8 retains identical switching characteristics, thermal specs, and absolute maximum ratings - ensuring seamless integration into existing industrial and avionics platforms.