Renesas QS3L384PAG

Overview

QS3L384PAG 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 range (–40°C to +85°C). It enables bidirectional signal routing between two 10-bit buses (A0–A9 and B0–B9) in hot-swap, voltage translation, and bus isolation applications.

For engineers reviewing the QS3L384PAG datasheet, QS3L384PAG pinout, QS3L384PAG application, or QS3L384PAG equivalent, key selection considerations include its TTL-compatible control inputs, undershoot clamp diodes on all I/O and control pins, ultra-low 0.2 μA quiescent current, and dual-enable architecture for selective 5-bit channel gating.

Technical Context

The QS3L384PAG implements ten independent N-channel FET switches with no inherent body diode to V_CC, enabling true bidirectional signal flow without DC path constraints. Its switch ON resistance remains stable across input voltage (0–2.4 V at 5 V V_CC), supporting 5 Ω typical and 7 Ω max R_ON.

Control logic uses two separate enable inputs (BEA, BEB) to independently activate upper (A0–A4/B0–B4) and lower (A5–A9/B5–B9) 5-bit segments. Switching is edge-independent - state changes occur only on enable level transitions, with turn-on delay (t_PZL) of 1.5–6.5 ns and turn-off delay (t_PLZ) of 1.5–5.5 ns under 50 pF load.

Key Specifications

Pinout & Package

QS3L384PAG is packaged in a 24-pin QSOP (Quarter Size Outline Package), 3.9 mm width, with standard JEDEC MO-137AC footprint and lead finish compliant with RoHS and green manufacturing standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384CPWR and PI3CHD384LEX, the QS3L384PAG uniquely delivers dual 5-bit enables for fine-grained power control, 5 V operation with –0.5 V to +7 V input tolerance, and zero added propagation delay - making it optimal for industrial hot-swap and mixed-voltage bus isolation where timing determinism and voltage flexibility are critical.

Availability

QS3L384PAG is available at Aetrix Electronics and suitable for hot-swapping, voltage translation, and bus isolation applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant green packaging.

Supply support for QS3L384PAG 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 QS3L384PAG belongs to Renesas' QuickSwitch® family of high-speed bus switches, designed specifically for deterministic, low-latency signal routing in industrial computing, telecom backplanes, and modular embedded systems.

FAQ

What is the maximum operating voltage for QS3L384PAG I/O pins?

The QS3L384PAG supports DC input voltages from –0.5 V to +7 V on all A, B, and control pins. This wide range enables safe interfacing across 5 V, 3.3 V, and 2.5 V domains and provides robust protection against transient undershoot down to –3 V (AC, ≤20 ns pulse width), as confirmed in the Absolute Maximum Ratings table.

Does QS3L384PAG support true bidirectional signal flow without direction control?

Yes, QS3L384PAG supports fully bidirectional signal flow on all A0–A9 and B0–B9 pins without direction pins or control sequencing. Its enhanced N-channel FET structure has no intrinsic body diode to V_CC, eliminating DC blocking and enabling seamless AC/DC signal pass-through in either direction when enabled.

How does the dual-enable architecture (BEA and BEB) improve power efficiency in QS3L384PAG?

The dual-enable architecture in QS3L384PAG allows independent activation of lower (A0–A4/B0–B4) and upper (A5–A9/B5–B9) 5-bit segments. When only one segment is active, dynamic and quiescent current consumption is reduced proportionally - e.g., BEA HIGH + BEB LOW cuts effective I/O count and capacitance by 50%, lowering both ICCD and ICCQ in partial-bus operation.

Is QS3L384PAG pin-compatible with other 24-pin QSOP bus switches like SN74CBT3384?

QS3L384PAG shares the same 24-pin QSOP package outline and pin count with SN74CBT3384, but pin functions differ: QS3L384PAG places BEA on pin 1 and BEB on pin 24, whereas SN74CBT3384 uses a single OE pin. Direct replacement requires PCB layout modification - QS3L384PAG is not a pin-compatible drop-in substitute.

What thermal derating applies to QS3L384PAG at maximum ambient temperature?

At TA = +85°C, QS3L384PAG's maximum power dissipation is rated at 0.5 W. With typical R_ON = 5 Ω and worst-case I_OUT = 120 mA, power dissipation per channel remains below 72 mW (I²R), well within thermal limits. No external heatsinking is required in standard 2-layer board layouts with adequate copper pour around GND and V_CC pins.