Renesas QS3L384QG

Overview

QS3L384QG from Renesas Electronics (formerly IDT) is a high-speed, low-power 10-bit CMOS bus exchange switch with dual independent 5-bit enables (BEA/BEB), 5 Ω typical ON resistance, zero added propagation delay, and industrial temperature support (–40°C to +85°C). It enables bidirectional voltage translation (e.g., 5V ↔ 3.3V), hot-swap isolation, and clock gating in embedded bus architectures.

For engineers reviewing the QS3L384QG datasheet, QS3L384QG pinout, QS3L384QG application, or QS3L384QG equivalent, key selection criteria include its dual-enable control logic, sub-1 ns turn-on/turn-off delays, ultra-low 0.2 μA quiescent current, undershoot clamp diodes on all I/Os, and compatibility with TTL-level control inputs.

Technical Context

The QS3L384QG implements ten independent N-channel FET switches without inherent body diodes to V_CC, eliminating shoot-through risk during voltage translation. Its dual enable architecture (BEA for A0–A4/B0–B4; BEB for A5–A9/B5–B9) allows granular 5-bit bus segmentation.

Each channel delivers 5 Ω typical R_ON at V_CC = 5 V and 0 V input, supporting ≤120 mA DC output current per pin. Switching is characterized with C_LOAD = 50 pF and exhibits t_PZL/t_PLZ ≤ 6.5/5.5 ns and no measurable propagation delay beyond RC load effects.

Key Specifications

Pinout & Package

QS3L384QG is packaged in a 24-pin QSOP (Quarter Size Outline Package) with green RoHS-compliant finish. Pin pitch is 0.635 mm; body dimensions are 8.65 mm × 3.90 mm × 1.35 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384DBR and PI3CHD384LEX, the QS3L384QG uniquely supports dual independent enables, 5V operation with undershoot clamping, and true bidirectional 5V↔3.3V translation - making it optimal for industrial hot-swap and legacy interface bridging.

Availability

QS3L384QG is available at Aetrix Electronics and suitable for hot-swappable backplane interfaces, voltage-level translating bus bridges, and power-gated subsystem isolation requiring stable component supply across extended temperature ranges.

Supply support for QS3L384QG 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 QS3L384QG belongs to Renesas' legacy QuickSwitch® bus switch product line, designed specifically for high-speed, low-noise, low-power bidirectional bus isolation and voltage translation in industrial and telecom systems.

FAQ

What is the maximum operating voltage for QS3L384QG?

The QS3L384QG supports an absolute maximum supply voltage (V_CC) of +7 V and a DC input voltage range of –0.5 V to +7 V on all pins, including A/B buses and enable inputs. Its recommended operating V_CC is 5 V ±5%, and it is fully characterized over this range for R_ON, timing, and leakage performance. Exceeding 7 V risks permanent damage per absolute maximum ratings.

Does QS3L384QG support bidirectional voltage translation between 5V and 3.3V systems?

Yes, QS3L384QG supports true bidirectional voltage translation without level-shifting circuitry. When A-side is driven at 5 V and B-side at 3.3 V (or vice versa), the absence of a body diode to V_CC prevents reverse current flow, and the 5 Ω R_ON ensures minimal voltage drop. This makes QS3L384QG ideal for interfacing legacy 5V logic with modern 3.3V peripherals.

How does the dual-enable architecture (BEA and BEB) function in QS3L384QG?

In QS3L384QG, BEA controls conduction for A0–A4/B0–B4 (lower 5 bits), while BEB controls A5–A9/B5–B9 (upper 5 bits). Both enables are active-HIGH and operate independently. This allows partial bus isolation - for example, disabling only high-order address lines during hot-swap while keeping data lines active - a capability not offered by single-enable alternatives like SN74CBT3384DBR.

What is the significance of "zero propagation delay" in QS3L384QG's datasheet?

"Zero propagation delay" means the QS3L384QG adds no logic-based delay - only the RC time constant of its 5 Ω R_ON and load capacitance. At C_L = 50 pF, this contributes ~0.25 ns, far less than typical driver rise/fall times. Thus, system-level timing is governed solely by upstream drivers and downstream loads - not the switch itself - preserving tight timing budgets in high-speed buses.

Is QS3L384QG pin-compatible with other QuickSwitch® devices like QS3L385 or QS3L386?

No, QS3L384QG is not pin-compatible with QS3L385 (12-bit, single-enable) or QS3L386 (12-bit, dual-enable but different pin mapping). The QS3L384QG uses a unique 24-pin QSOP layout with BEA/BEB on pins 1 and 24, and interleaved A/B bus routing. Substituting requires PCB redesign; always verify pinout diagrams and functional block diagrams before replacement.