Nexperia USA Inc. CBT3244ABQ,115

Overview

CBT3244ABQ,115 from Nexperia is an octal bus switch with dual 4-bit low-impedance bidirectional switches, TTL-compatible control inputs, 5 Ω typical ON-state resistance, <0.25 ns propagation delay, and operation from –40 °C to +85 °C - used for high-speed data path isolation in memory address/data buses and peripheral interface multiplexing.

For engineers reviewing the CBT3244ABQ,115 datasheet, CBT3244ABQ,115 pinout, CBT3244ABQ,115 application, or CBT3244ABQ,115 equivalent, this device supports bidirectional signal routing with independent quad-output enables, minimal RC delay under 50 pF load, and robust ESD protection (HBM >2000 V), making it critical for noise-sensitive digital interconnects in industrial controllers and test equipment.

Technical Context

The CBT3244ABQ implements two independent 4-bit analog bus switches, each controlled by a dedicated active-low output-enable (OE) input. Its transmission-gate architecture delivers symmetrical bidirectional conduction with no directionality constraint between A and B ports.

Switching behavior follows strict truth-table logic: both OEs LOW enables full 8-bit pass-through; either OE HIGH places its associated 4-bit channel in high-impedance OFF state. No internal level-shifting or voltage translation occurs - all I/O operate at the same VCC-referenced TTL logic levels.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 × 4.5 × 0.85 mm body, 20-terminal no-lead thermal-enhanced quad flat layout with exposed thermal pad (non-soldered or GND-connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3244CPWR and 74LVC244APW,118, the CBT3244ABQ,115 uniquely combines sub-5 Ω R_ON, true bidirectionality, 5 V operation, and ultra-compact DHVQFN20 - making it the sole choice for high-density, high-speed, mixed-voltage bus isolation where physical size and signal fidelity are co-constrained.

Availability

CBT3244ABQ,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion modules, memory subsystem isolation, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CBT3244ABQ,115 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for industrial, automotive, and computing markets.

The CBT3244A series belongs to Nexperia's high-speed analog switch product line, engineered specifically for low-latency, bidirectional digital signal routing in space- and timing-critical embedded systems.

FAQ

Is CBT3244ABQ,115 pin-compatible with standard 74-series '244 devices?

Yes - it uses the industry-standard '244 pinout (dual 4-bit non-inverting buffer layout), allowing direct PCB replacement of 74LS244 or 74HC244 without trace modification. Pin functions match exactly: OE inputs at pins 1 and 19, A/B I/O pairs distributed symmetrically across the 20-pin DHVQFN20 footprint per Figure 5 in the datasheet.

Can CBT3244ABQ,115 operate reliably at 3.3 V supply?

No - the device is specified only for 4.5 V to 5.5 V operation per Table 6 (Recommended Operating Conditions). At 3.3 V, input thresholds (VIH ≥2.0 V, VIL ≤0.8 V) remain valid, but ON-state resistance rises significantly beyond 15 Ω and propagation delay degrades beyond specification, risking timing violations in high-speed applications.

What is the role of the exposed thermal pad on the DHVQFN20 package?

The exposed pad (pin 1 index area, labeled "GND(1)") is mechanically attached to the die substrate using conductive die attach material. It is not an electrical supply pin. While not required to be soldered, if connected, it must be tied to PCB ground - floating connection is acceptable but provides no thermal benefit; grounding improves thermal resistance by ~15 °C/W.

Does CBT3244ABQ,115 support hot-swap or live-insertion in backplane applications?

Yes - its latch-up immunity (>500 mA per JESD78) and robust ESD protection (HBM >2000 V, CDM >1000 V) enable safe operation during hot-plug events. However, system-level backplane sequencing (e.g., staggered VCC/GND mating) remains essential; the device itself tolerates transient overcurrents but does not manage power-rail ramp rates.