Nexperia USA Inc. CBT3253ADB,118

Overview

CBT3253ADB,118 from Nexperia is a dual 1-of-4 FET bus switch IC with two independent single-pole, four-throw (SP4T) channels, 5 Ω typical ON resistance at 5 V, -40 °C to +85 °C operating range, and TTL-compatible control inputs. It enables bidirectional signal routing in high-speed digital interconnects such as memory address/data buses and FPGA I/O expansion.

For engineers reviewing the CBT3253ADB,118 datasheet, CBT3253ADB,118 pinout, CBT3253ADB,118 application, or CBT3253ADB,118 equivalent, key selection criteria include ON resistance matching, enable timing (enable/disable times ≤7.2 ns), overvoltage-tolerant control inputs up to 5.5 V, and SO16 package compatibility with legacy PCB footprints.

Technical Context

The CBT3253ADB,118 implements two independent analog/digital bus switches using low-threshold FETs, each controlled by separate active-low output enable (1OE, 2OE) and 2-bit binary select (S0, S1) inputs. Switching is fully bidirectional with no internal directionality - signals pass equally from A-to-B or B-to-A terminals.

It operates within a strict 4.5 V to 5.5 V supply range and features overvoltage-tolerant control pins (VI up to 7.0 V absolute max), latch-up immunity >100 mA per JESD78 Class II Level A, and ESD robustness (HBM >2000 V, CDM >1000 V). Propagation delay is ≤0.25 ns, and disable time is ≤7 ns.

Key Specifications

Pinout & Package

CBT3253ADB,118 is supplied in SO16 (SOT109-1) package: plastic small outline, 16 leads, 3.9 mm body width, 1.27 mm lead pitch, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 1-of-4 bus switch applications.

Compared with SN74CBT3253CPWR and 74LVC2G53DP,125, the CBT3253ADB,118 delivers the lowest ON resistance (5 Ω) in a standard SO16 footprint, making it optimal for high-fidelity 5 V signal routing where insertion loss and timing skew must be minimized.

Availability

CBT3253ADB,118 is available at Aetrix Electronics and suitable for memory subsystems, FPGA I/O expansion, and automated test equipment requiring stable component supply, long-term industrial lifecycle support, and SO16 package compatibility.

Supply support for CBT3253ADB,118 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, computing, and consumer applications.

The CBT3253ADB,118 belongs to Nexperia's CBT (Crosspoint Bus Transceiver) family, engineered specifically for low-latency, low-R_ON signal routing in 5 V digital systems without introducing logic-level translation or timing overhead.

FAQ

What is the maximum allowable voltage on control inputs (S0, S1, 1OE, 2OE) when VCC = 5 V?

The control inputs are overvoltage tolerant up to 5.5 V regardless of VCC level, with absolute maximum rating of +7.0 V. This allows safe interfacing with 5 V logic even if VCC is temporarily absent or at brown-out levels, preventing damage during power sequencing mismatches.

Can CBT3253ADB,118 be used in bidirectional 3.3 V signal paths with a 5 V supply?

Yes - its bidirectional architecture and 5 Ω ON resistance support clean 3.3 V signal transmission across the switch when VCC = 5 V. The device does not impose level shifting; signal swing is preserved end-to-end, making it suitable for mixed-voltage interconnects where logic thresholds are compatible.

Is there any risk of signal contention when both 1OE and 2OE are asserted simultaneously?

No - each channel operates independently. Asserting both 1OE and 2OE enables both SP4T sections concurrently without electrical interaction. The A- and B-terminals of Channel 1 and Channel 2 are fully isolated, eliminating cross-talk or contention under simultaneous enable conditions.

Does CBT3253ADB,118 require external pull-up or pull-down resistors on unused control inputs?

Yes - per datasheet Section 8, all unused control inputs (S0, S1, 1OE, 2OE) must be held at either VCC or GND to prevent floating states that could cause partial turn-on, increased ICC, or unpredictable switching behavior. No internal weak pull-ups/pull-downs are provided.