Renesas 74CBTLV3861QG8

Overview

74CBTLV3861QG8 from Renesas Electronics is a low-voltage 10-bit bus switch IC with bi-directional 5Ω on-resistance, 2.3V–3.6V supply operation, and industrial temperature range (−40°C to +85°C), used for high-speed 3.3V bus isolation and signal routing in memory expansion and peripheral interconnect applications.

For engineers reviewing the 74CBTLV3861QG8 datasheet, 74CBTLV3861QG8 pinout, 74CBTLV3861QG8 application, or 74CBTLV3861QG8 equivalent, key selection criteria include propagation delay ≤0.25 ns, output enable/disable timing ≤4.5 ns/5 ns, over-voltage tolerance up to +4.6V, power-off isolation, and QSOP-24 package compatibility.

Technical Context

The 74CBTLV3861QG8 implements a single 10-bit bi-directional analog bus switch controlled by an active-low OE input; when OE = LOW, A1–A10 are connected to B1–B10 with minimal R_ON (5Ω typical at V_CC = 3V); when OE = HIGH, both ports enter high-impedance isolation.

It supports hot-swap capability via power-off isolation and over-voltage tolerance (VI/O up to +4.6V), operates across full industrial temperature range, and meets ESD ratings >2000V HBM and >200V MM - critical for robust system-level I/O buffering in mixed-voltage environments.

Key Specifications

Pinout & Package

74CBTLV3861QG8 is packaged in a 24-pin QSOP (PCG24) with 0.65 mm pitch, 8.65 mm × 3.9 mm body size, and exposed pad not present. Pin assignment follows standard bus switch topology with dual 10-bit I/O banks and shared OE control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3861PWR and 74LVC1G3157GW, the 74CBTLV3861QG8 uniquely delivers 10-bit parallel switching in QSOP-24 with guaranteed ≤0.25 ns propagation delay and industrial-grade power-off isolation - making it optimal for memory expansion and multi-peripheral bus architectures where channel count and timing precision are critical.

Availability

74CBTLV3861QG8 is available at Aetrix Electronics and suitable for industrial automation interfaces, memory expansion subsystems, and hot-swappable peripheral modules requiring stable component supply across extended temperature and long production lifecycles.

Supply support for 74CBTLV3861QG8 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 74CBTLV3861QG8 belongs to Renesas' CBTLV low-voltage bus switch family, engineered specifically for high-speed, low-latency signal routing in 2.5V/3.3V digital systems with stringent isolation and mixed-voltage interoperability requirements.

FAQ

What is the maximum operating voltage on the I/O pins of the 74CBTLV3861QG8?

The 74CBTLV3861QG8 supports an absolute maximum I/O voltage range of −0.5V to +4.6V, independent of V_CC. This over-voltage tolerance allows safe interfacing with higher-voltage signals (e.g., 5V-tolerant peripherals) even when V_CC is at 2.3V or 3.3V, making the 74CBTLV3861QG8 suitable for mixed-voltage system integration without external clamping diodes.

Does the 74CBTLV3861QG8 require external pull-up resistors on the OE pin?

Yes - to ensure a defined high-impedance state during power-up or power-down sequences, OE should be tied to V_CC via an external pull-up resistor. The minimum resistance value depends on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ. This prevents undefined switch states and avoids potential bus contention before system initialization completes, a requirement explicitly stated in the 74CBTLV3861QG8 functional description.

Can the 74CBTLV3861QG8 be used in hot-swap applications?

Yes - the 74CBTLV3861QG8 is designed for hot-swap use due to its power-off isolation (IOFF ≤50 µA at V_CC = 0) and over-voltage tolerant I/O (−0.5V to +4.6V). These features prevent back-driving, latch-up, and transient damage when modules are inserted or removed under power. Its >100 mA latch-up immunity per JEDEC JESD78 further confirms suitability for live-backplane applications such as industrial I/O carriers using the 74CBTLV3861QG8.

What is the typical on-resistance (R_ON) of the 74CBTLV3861QG8 and how does it vary with supply voltage?

The 74CBTLV3861QG8 has a typical on-resistance of 5Ω at V_CC = 3V and IO = 24mA. At V_CC = 2.3V, R_ON increases to ≤8Ω (max), while at V_CC = 3.6V, it drops to ≤7Ω (max). This voltage-dependent R_ON behavior is documented in the DC Electrical Characteristics table and directly impacts propagation delay and signal attenuation - a key design consideration when selecting the 74CBTLV3861QG8 for high-speed bus applications.

Is the 74CBTLV3861QG8 pin-compatible with other members of the CBTLV3861 family?

Yes - the 74CBTLV3861QG8 shares identical pinout and functionality with all variants in the CBTLV3861 family, including 74CBTLV3861PGG8 (TSSOP-24) and 74CBTLV3861QG (QSOP-24 tube version). Differences are limited to packaging (QSOP vs. TSSOP), reel/tube packaging, and RoHS compliance marking - all electrical, timing, and thermal specifications remain fully aligned across the 74CBTLV3861QG8 product line.