NXP Semiconductors CBT3244ADS,112

Overview

CBT3244ADS,112 from Nexperia is an octal bus switch with dual quad-output-enable control, organized as two independent 4-bit low-impedance bidirectional switches. It features 5 Ω typical ON-state resistance, TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), and operates from -40 °C to +85 °C at 4.5–5.5 V supply. It enables high-speed data routing in memory address/data bus isolation and peripheral interface applications.

For engineers reviewing the CBT3244ADS,112 datasheet, CBT3244ADS,112 pinout, CBT3244ADS,112 application, or CBT3244ADS,112 equivalent, key selection criteria include bidirectional switching latency (tpd ≤ 0.25 ns), enable/disable timing (ten/tdis ≤ 5.6/6.0 ns), thermal-enhanced DHVQFN20 package compatibility, and latch-up immunity (>500 mA per JESD78).

Technical Context

The CBT3244ADS,112 implements two independent 4-bit analog bus switches controlled by separate active-low OE inputs (1OE and 2OE). Each switch supports bidirectional signal flow between A- and B-side ports with minimal propagation delay due to low Ron (4–7 Ω at 4.5 V, 64 mA).

Its static design includes TTL-level compatible control inputs, ±1 μA input leakage, and 1–3 μA supply current (ICC) under quiescent conditions. Dynamic behavior is characterized by sub-nanosecond propagation delay and nanosecond-scale enable/disable transitions, verified under 50 pF load and 5 V supply.

Key Specifications

Pinout & Package

DHVQFN20 plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads; 20 terminals; body 2.5 × 4.5 × 0.85 mm (SOT764-1). Exposed die pad (terminal 1) is substrate-connected but electrically floating unless tied to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3244CPWR, CBT3244ADS,112 offers identical switching performance and pin compatibility but differs in thermal profile (DHVQFN20 vs. TSSOP20) and manufacturer-specific ESD robustness. Versus 74LVC244APW,118, it delivers true bidirectional low-Ron switching - essential for bus sharing, not just buffering.

Availability

CBT3244ADS,112 is available at Aetrix Electronics and suitable for memory bus isolation, peripheral interface multiplexing, hot-swap backplane interfaces, and test equipment signal routing requiring stable component supply and industrial temperature support.

Supply support for CBT3244ADS,112 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 delivering high-performance, reliable, and efficient logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The CBT3244ADS,112 belongs to Nexperia's CBT (CrossBar Transistor) family of high-speed bus switches, engineered specifically for low-latency, bidirectional signal routing in 5 V digital systems with stringent timing and noise requirements.

FAQ

What is the maximum operating frequency supported by the CBT3244ADS,112?

The CBT3244ADS,112 does not specify a maximum clock frequency, but its 0.25 ns propagation delay and 5–7 Ω ON-resistance enable reliable operation in systems with signal edges faster than 1 GHz. System-level bandwidth is determined by load capacitance and trace impedance - typical applications include 100–200 MHz parallel buses and high-speed sideband signal routing where timing margins are critical. The CBT3244ADS,112 itself imposes negligible delay or distortion.

Can the CBT3244ADS,112 be used with 3.3 V logic systems?

The CBT3244ADS,112 is specified for 4.5–5.5 V operation and requires VCC = 5 V for guaranteed performance. Its TTL-compatible inputs accept 0.8 V/2.0 V thresholds, but 3.3 V logic may not reliably drive the OE pins into full saturation, risking incomplete switching or increased ICC. For 3.3 V systems, Nexperia's 74LVC series or dedicated 3.3 V bus switches are recommended. The CBT3244ADS,112 must be powered from 5 V even if interfacing with mixed-voltage signals.

Is the exposed pad on the CBT3244ADS,112's DHVQFN20 package required to be soldered to ground?

No - the exposed pad (terminal 1) on the CBT3244ADS,112's DHVQFN20 package is connected to the silicon substrate and has no electrical requirement for soldering. It may remain floating or be connected to GND for improved thermal performance, but grounding is optional and not necessary for functional operation. If soldered, the land pattern must either float or tie directly to GND; do not connect to other nets. This design choice supports flexible thermal management in space-constrained layouts.

Does the CBT3244ADS,112 support hot-plug operation in live backplanes?

Yes - the CBT3244ADS,112 supports hot-plug operation when used with proper sequencing: assert OE HIGH before insertion to maintain high-impedance isolation, then drive OE LOW after power stabilization. Its 2000 V HBM ESD rating, latch-up immunity (>500 mA), and 5 Ω Ron minimize transient stress during connector mating. However, system-level protection (e.g., series resistors, TVS diodes) remains essential. The CBT3244ADS,112 itself provides the core isolation capability needed for safe hot-swap implementation.

How does the CBT3244ADS,112 differ from the CBT3244AD variant?

The CBT3244ADS,112 uses the DHVQFN20 (SOT764-1) package - thermally enhanced, 0.85 mm height, 2.5 × 4.5 mm body - while CBT3244AD uses SO20 (SOT163-1), a 7.5 mm wide standard small-outline package. Both share identical electrical specs, pin functions, and logic behavior. The "S" suffix in CBT3244ADS,112 denotes the DHVQFN20 variant; the ",112" is Nexperia's tape-and-reel ordering code. Functionally, the CBT3244ADS,112 is a direct replacement where board space and thermal performance are prioritized.