Texas Instruments SN74CBT16214DLR

Overview

SN74CBT16214DLR from Texas Instruments is a 12-bit, 1-of-3 FET multiplexer/demultiplexer with TTL-compatible control inputs, 5 Ω typical ON-state resistance, and sub-nanosecond propagation delay (0.25 ns at 5 V). It routes 12 bidirectional data lines between one common A port and three independent B ports (B1–B3) under 3-bit select control (S0–S2), enabling high-speed bus expansion in industrial I/O and programmable logic systems.

For engineers reviewing the SN74CBT16214DLR datasheet, SN74CBT16214DLR pinout, SN74CBT16214DLR application, or SN74CBT16214DLR equivalent, key selection criteria include its 56-pin SSOP package, 4–5.5 V supply range, ±128 mA channel current rating, -40°C to +85°C operating temperature, and 5 Ω r_ON for minimal signal attenuation in high-frequency digital switching.

Technical Context

The SN74CBT16214DLR implements a passive FET-based analog switch architecture-no internal level-shifting or drive circuitry-making it suitable for bidirectional, voltage-transparent signal routing. Its three independent select inputs (S0–S2) decode into eight possible states, of which six enable A↔B1, A↔B2, or A↔B3 connections; two states place all channels in high-impedance disconnect mode.

Each of the 12 channels features matched ON-resistance (4–7 Ω at 4.5 V, 30 mA), low input/output capacitance (4 pF control, 7.5 pF OFF-state), and TTL-compatible VIH/VIL thresholds (2.0 V/0.8 V), allowing direct interfacing with legacy 5 V logic without level translators.

Key Specifications

Pinout & Package

SN74CBT16214DLR is housed in a 56-pin SSOP (Shrink Small Outline Package) with 0.635 mm pitch, body size 10.35 mm × 18.42 mm, and 1.2 mm max height. Pin 1 is located at top-left corner with notch or index mark.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit bus-switching applications.

Compared with SN74CBT16214DLR, SN74CBTD16214DLR trades marginal ON-resistance increase for built-in signal conditioning, while 74LVC1G3157DP,125 sacrifices integration density for package miniaturization-neither offers pin-compatible replacement without layout revision.

Availability

SN74CBT16214DLR is available at Aetrix Electronics and suitable for industrial I/O expansion, programmable logic interfacing, digital audio routing, and factory automation bus switching requiring stable component supply across extended production lifecycles.

Supply support for SN74CBT16214DLR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability interface and signal-path components.

The SN74CBT16214DLR belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, bidirectional digital signal routing in industrial control, test equipment, and programmable logic applications.

FAQ

What is the maximum operating frequency supported by the SN74CBT16214DLR?

The SN74CBT16214DLR does not specify a maximum operating frequency in its datasheet because it functions as a passive analog switch-not a clocked digital device. Its 0.25 ns propagation delay at 5 V enables reliable operation with digital signals up to approximately 1 GHz, limited primarily by PCB trace design and load capacitance rather than internal device bandwidth. For SN74CBT16214DLR, signal integrity depends on maintaining controlled impedance and minimizing stub lengths.

Can the SN74CBT16214DLR be used with 3.3 V logic systems?

The SN74CBT16214DLR is specified for 4.0 V to 5.5 V supply operation and requires TTL-compatible control inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V). While it may function with 3.3 V control signals if VIH is met, its ON-resistance increases significantly below 4 V, degrading performance. For native 3.3 V systems, TI recommends the SN74CB3Q16214 or SN74LVC16245 families instead of SN74CBT16214DLR.

Does the SN74CBT16214DLR support hot-swap or live-insertion?

The SN74CBT16214DLR has no built-in hot-swap protection circuitry. Its FET switch architecture lacks power sequencing control or current limiting, so applying VCC before establishing proper GND connection-or inserting into a live backplane-risks latch-up or ESD damage. TI explicitly cautions against floating inputs and recommends tying all unused S0–S2 lines to VCC or GND before power-up. Safe hot-swap requires external circuitry for SN74CBT16214DLR.

How many simultaneous connections can the SN74CBT16214DLR make between ports?

The SN74CBT16214DLR supports only one active connection at a time: either A↔B1, A↔B2, or A↔B3, as determined by the S0–S2 select code. The function table confirms that only three states enable conduction; all others place all 12 channels in high-impedance disconnect. There is no provision for concurrent A↔B1 and A↔B2 routing in SN74CBT16214DLR.

What is the thermal resistance (θ_JA) of the SN74CBT16214DLR in its SSOP package?

The SN74CBT16214DLR in the DL (SSOP-56) package has a junction-to-ambient thermal resistance (θ_JA) of 56°C/W, as measured under standard JEDEC JESD51-2 conditions. This value assumes a 2-layer PCB with 1 in² copper pour under the package. Actual thermal performance improves with additional copper area, internal planes, or thermal vias-critical for sustained 128 mA channel current operation in SN74CBT16214DLR designs.