NXP Semiconductors CBTS3306D,112

Overview

CBTS3306D,112 from NXP Semiconductors (formerly Philips) is a dual FET bus switch with integrated Schottky diode clamping on all I/O ports, designed for bidirectional signal routing in 5 V TTL/CMOS systems. It features 5 Ω typical on-resistance, 0.25 ns max propagation delay, and operates across –40 °C to +85 °C - used in address/data bus isolation and hot-swap interface protection.

For engineers reviewing the CBTS3306D,112 datasheet, CBTS3306D,112 pinout, CBTS3306D,112 application, or CBTS3306D,112 equivalent, key selection criteria include on-resistance stability under 30–100 mA load, sub-5 ns enable/disable timing, latch-up immunity (>100 mA), and compatibility with SO8 packaging for legacy board layouts.

Technical Context

The CBTS3306D,112 implements two independent single-pole single-throw (SPST) analog switches using NMOS pass transistors with back-to-back Schottky diodes per I/O to clamp negative undershoot to –0.7 V (A/B) and –1.2 V (control pins). Each switch is controlled by a dedicated OE input operating at TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V).

It functions as a level-translating, low-capacitance signal path: CIO(OFF) = 7.6 pF ensures minimal signal loading when disabled, while ICC ≤ 3 µA supports low-quiescent-power system design. The device requires no external biasing and draws zero static current when all inputs are at rail.

Key Specifications

Pinout & Package

CBTS3306D,112 is housed in an 8-pin plastic small outline (SO8) package per SOT96-1, 3.9 mm body width, with gull-wing leads and standard JEDEC MS-012 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3306CPW and 74LVC1G3157GW, CBTS3306D,112 uniquely delivers factory-integrated Schottky clamping for 5 V bus undershoot suppression in a pin-compatible SO8 package - critical for maintaining signal integrity in legacy industrial backplanes without layout changes.

Availability

CBTS3306D,112 is available at Aetrix Electronics and suitable for PCI bus isolation, memory address multiplexing, and ISA interface protection requiring stable component supply and long-term industrial availability.

Supply support for CBTS3306D,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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' logic IC heritage.

The CBTS3306D,112 belongs to NXP's legacy logic bus switch family, engineered specifically for robust 5 V signal routing in industrial backplanes and expansion interfaces where reliability under electrical stress is non-negotiable.

FAQ

What is the maximum operating temperature range for CBTS3306D,112?

The CBTS3306D,112 is characterized for continuous operation from –40 °C to +85 °C ambient temperature, meeting industrial-grade thermal requirements. This range is validated per the manufacturer's recommended operating conditions and confirmed in the absolute maximum ratings table, where storage extends to +150 °C but functional operation is limited to the –40 °C to +85 °C window. CBTS3306D,112 maintains specified on-resistance and timing performance across this full range.

Does CBTS3306D,112 support bidirectional signal flow?

Yes, CBTS3306D,112 supports true bidirectional signal transmission between A and B ports - the NMOS pass transistor architecture imposes no directionality. Signals propagate with equal tPLH/tPHL delay (≤0.25 ns) in either direction, and on-resistance remains symmetric regardless of voltage polarity across the switch. CBTS3306D,112 is commonly deployed in data/address bus applications where direction reverses dynamically.

Can CBTS3306D,112 be used with 3.3 V logic systems?

No - CBTS3306D,112 is specified only for 4.5 V to 5.5 V supply operation and TTL-compatible control thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). While it may function marginally at 3.3 V, its on-resistance rises sharply, propagation delay increases, and Schottky clamping voltage shifts outside guaranteed limits. For 3.3 V systems, CBTS3306D,112 is not recommended; use 74LVC-series alternatives instead.

What is the purpose of the Schottky diodes in CBTS3306D,112?

The integrated Schottky diodes in CBTS3306D,112 clamp negative voltage undershoot on all I/O pins to –0.7 V (A/B ports) or –1.2 V (control inputs), preventing damage or logic upset during hot-insertion, ESD events, or inductive kickback. This eliminates the need for external clamping diodes in most 5 V bus applications. CBTS3306D,112 achieves this without adding series resistance or affecting signal rise/fall times.

Is CBTS3306D,112 pin-compatible with other dual bus switches in SO8 packages?

CBTS3306D,112 shares the same SO8 pinout (SOT96-1) and pin functions with SN74CBT3306CPW and MC74VHC3306DR2, making it a direct physical replacement in existing layouts. However, only CBTS3306D,112 guarantees Schottky clamping per datasheet - other variants may require external protection. Always verify control logic polarity and timing specs before substitution. CBTS3306D,112 retains full functionality in those footprints.