Nexperia USA Inc. CBT3245ADB,112

Overview

CBT3245ADB,112 from Nexperia is an octal bus switch IC with 8 independent single-pole single-throw (SPST) analog switches, controlled by a single active-low output enable (OE) input, featuring 5 Ω typical ON resistance at 4.5 V, IOFF partial power-down capability, and operation from -40 °C to +85 °C. It enables bidirectional signal routing in high-speed digital buses such as address/data lines in microcontroller peripherals and memory expansion interfaces.

For engineers reviewing the CBT3245ADB,112 datasheet, CBT3245ADB,112 pinout, CBT3245ADB,112 application, or CBT3245ADB,112 equivalent, key selection criteria include ON-resistance matching across channels, IOFF-enabled isolation during partial power-down, TTL-compatible control voltage thresholds, and TSSOP20 package thermal performance in space-constrained PCB layouts.

Technical Context

The CBT3245ADB,112 implements eight independent transmission-gate-style analog switches, each with symmetrical A–B bidirectional conduction when OE is LOW. Its IOFF circuitry ensures leakage current remains below 5 μA when VCC = 0 V, enabling safe hot-insertion and partial system power-down without back-driving powered sections.

Switching is governed by CMOS-level control logic: OE must be ≤ 0.8 V for enable (LOW), ≥ 2.0 V for disable (HIGH); all A/B ports tolerate up to 7.0 V regardless of VCC, supporting mixed-voltage domain interfacing. Propagation delay is limited to 0.25 ns (typical), with enable/disable times under 6 ns at 5 V.

Key Specifications

Pinout & Package

TSSOP20 (SOT360-1) package: plastic thin shrink small outline, 20 leads, 4.4 mm body width, 0.65 mm pitch, 1.1 mm max height. Exposed thermal pad (pin 10, GND) improves thermal dissipation but requires floating or GND connection per datasheet guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3245APW and 74LVC245AD, the CBT3245ADB,112 uniquely combines industrial temperature range, verified IOFF behavior, and superior CDM ESD robustness - making it the sole choice for hot-pluggable industrial backplanes and mixed-voltage test fixtures where signal integrity and power-domain isolation are non-negotiable.

Availability

CBT3245ADB,112 is available at Aetrix Electronics and suitable for memory expansion interfaces, microcontroller peripheral multiplexing, industrial I/O module isolation, and automated test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CBT3245ADB,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 logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, automotive, and computing applications.

The CBT3245A series belongs to Nexperia's high-speed bus switch product line, engineered specifically for low-latency, bidirectional signal routing in mixed-voltage digital systems where power-domain isolation and signal fidelity are critical.

FAQ

What is the maximum signal frequency supported by CBT3245ADB,112?

The CBT3245ADB,112 supports digital signals up to 100 MHz in practice, based on its 0.25 ns propagation delay and 6.6 pF off-state capacitance. At 5 V supply, rise/fall times remain under 2.5 ns with 50 pF load, enabling clean edge transmission without significant distortion in high-speed parallel bus applications.

Can CBT3245ADB,112 be used with 3.3 V logic while powered by 5 V VCC?

Yes - the A/B I/O pins tolerate -0.5 V to +7.0 V independently of VCC, so 3.3 V logic signals may safely pass through the switch even when VCC = 5 V. The OE input remains TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V), requiring no level shifting for 3.3 V control signals.

Is the exposed thermal pad (pin 10) required to be soldered to ground?

No - the datasheet explicitly states pin 10 (GND) is a thermal pad with no electrical requirement to solder it. If soldered, the land must remain electrically floating or connected to GND; it must not be left partially soldered or tied to any other net, as this may compromise thermal performance or cause latch-up.

Does CBT3245ADB,112 support hot-swap operation in live backplanes?

Yes - its IOFF circuitry guarantees sub-5 μA leakage when VCC = 0 V, preventing back-current into powered slots. Combined with overvoltage-tolerant I/O and 2000 V HBM ESD rating, it meets core requirements for hot-plug-capable modular industrial backplanes operating across -40 °C to +85 °C.