Nexperia USA Inc. CBT3253AD,112

Overview

CBT3253AD,112 from Nexperia is a dual 1-of-4 FET bus switch IC with two independent SP4T switch arrays, each controlled by active-low enable (1OE/2OE) and 2-bit binary select (S0/S1). It delivers 5 Ω typical ON resistance at 5 V, supports TTL-level control inputs tolerant to 5.5 V, and operates across -40 °C to +85 °C in SO16 (SOT109-1) package. Used for high-speed data routing in digital logic interfaces and memory expansion subsystems.

For engineers reviewing the CBT3253AD,112 datasheet, CBT3253AD,112 pinout, CBT3253AD,112 application, or CBT3253AD,112 equivalent, key selection criteria include ON-resistance matching, enable timing (ten ≤ 6.4 ns), supply voltage range (4.5–5.5 V), thermal stability over industrial temperature, and compatibility with 3.3 V/5 V mixed-signal bus architectures.

Technical Context

The CBT3253AD implements two independent bidirectional analog/digital bus switches using low-threshold NMOS FETs without level-shifting circuitry. Each channel routes one A-port (1A or 2A) to one of four B-ports (1B1–1B4 or 2B1–2B4) based on synchronous S0/S1 decoding under asserted nOE.

Switching is governed by static CMOS control logic with latch-up protection (>100 mA per JESD78 Class II A) and ESD robustness (HBM >2000 V, CDM >1000 V). Propagation delay is minimized (<0.25 ns) due to absence of internal buffering, making it suitable for transparent signal pass-through in high-speed parallel buses.

Key Specifications

Pinout & Package

CBT3253AD,112 is housed in a plastic small outline package (SO16) per JEDEC MS-012, SOT109-1, with 16 leads and 3.9 mm body width. Pin 1 is index-marked; pin 8 is GND and pin 16 is VCC.

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, the CBT3253AD,112 offers superior combination of low R_ON, ultra-fast enable timing, and native dual 1-of-4 functionality in a single SO16 footprint - reducing component count and layout complexity for industrial bus-switching designs.

Availability

CBT3253AD,112 is available at Aetrix Electronics and suitable for industrial automation controllers, test instrumentation signal routing, and legacy interface bridging requiring stable component supply and long-term lifecycle support.

Supply support for CBT3253AD,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 focused on high-volume, high-reliability essential semiconductors for automotive, industrial, mobile, and computing markets.

The CBT3253A belongs to Nexperia's Bus Switch family, engineered specifically for low-latency, bidirectional signal routing in 5 V digital systems where minimal propagation delay and robust ESD performance are critical.

FAQ

What is the maximum continuous current per switch channel?

The CBT3253AD,112 supports up to 128 mA continuous current per switch channel, as specified in the Absolute Maximum Ratings table. This rating applies under steady-state conditions with proper PCB thermal design; transient peaks may exceed this value briefly but must remain within the device's safe operating area defined by power dissipation limits (500 mW total).

Can unused control inputs be left floating?

No - all unused control inputs (S0, S1, 1OE, 2OE) must be tied to either VCC or GND to ensure predictable switching behavior and prevent unintended channel activation. Floating inputs may cause erratic operation, increased supply current, or excessive shoot-through current due to indeterminate logic states at the internal gate drivers.

Is the CBT3253AD,112 suitable for analog signal switching?

Yes - its bidirectional, low-R_ON, low-capacitance architecture supports analog signals up to ~100 MHz, provided signal swing remains within the VCC–GND range and DC bias does not exceed absolute maximum ratings. However, it lacks rail-to-rail input capability and is not optimized for precision analog applications requiring distortion or THD specifications.

Does the device require external pull-up or pull-down resistors on OE pins?

No - the OE inputs are CMOS-compatible with defined VIH/VIL thresholds (≥2.0 V / ≤0.8 V); however, pull-down resistors (e.g., 10 kΩ to GND) are recommended if OE is driven by open-drain or high-impedance sources to guarantee reliable LOW assertion during power-up or reset sequences.