Texas Instruments SN74CBT16214DGGR

Overview

SN74CBT16214 from Texas Instruments is a 12-bit, 1-of-3 FET multiplexer/demultiplexer with TTL-compatible inputs, 5 Ω typical ON-state resistance, and 0.25 ns propagation delay at 5 V. It operates across –40°C to 85°C and supports high-speed bus switching between three independent 12-bit ports in industrial control and programmable logic systems.

For engineers reviewing the SN74CBT16214 datasheet, SN74CBT16214 pinout, SN74CBT16214 application, or SN74CBT16214 equivalent, key selection considerations include its 3-port select architecture (S0–S2), bidirectional I/O capability per channel, low R_ON tolerance over voltage/temperature, and TSSOP-56 packaging for dense PCB layouts.

Technical Context

The SN74CBT16214 implements a passive FET-based analog switch matrix-not a logic-controlled digital multiplexer-enabling bidirectional signal routing without level-shifting or direction pins. Each of its 12 channels connects one A port to one of three B ports (B1/B2/B3) based on S0–S2 binary select inputs.

Its operation relies on voltage-controlled MOSFET conduction with no internal drive circuitry: all I/O pins are passive, current-passing terminals. The device requires external biasing and does not source/sink current; signal integrity depends on load capacitance (<50 pF specified) and trace impedance matching.

Key Specifications

Pinout & Package

TSSOP-56 package (8.10 mm × 14.00 mm, 1.2 mm max height), lead finish NiPdAu, moisture sensitivity level 1, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTD16214DGGR and 74FST16214MTDX, the SN74CBT16214 offers the widest supply range (4–5.5 V), lowest quiescent current (3 µA), and best r_ON flatness-making it optimal for battery-backed industrial controllers and precision analog routing where power and matching matter.

Availability

SN74CBT16214 is available at Aetrix Electronics and suitable for factory automation I/O expansion, programmable logic interconnect, and consumer audio signal routing requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for SN74CBT16214 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 90 years of innovation in industrial, automotive, and communications markets.

The SN74CBT16214 belongs to TI's Widebus™ family of high-speed FET bus switches, designed specifically for low-latency, bidirectional signal routing in 5-V systems where timing integrity and minimal signal degradation are critical.

FAQ

What is the maximum operating frequency supported by the SN74CBT16214?

The SN74CBT16214 does not specify a maximum operating frequency in its datasheet because it functions as a passive analog switch, not a clocked digital device. Its usable bandwidth is determined by RC time constant: with typical r_ON = 5 Ω and load capacitance ≤50 pF, the -3dB point exceeds 600 MHz. For reliable digital signal routing, edge rates should remain below 1 V/ns to avoid distortion - verified in the SN74CBT16214 switching characteristics table under t_pd and t_dis tests.

Can the SN74CBT16214 be used with 3.3-V logic signals?

Yes, the SN74CBT16214 can pass 3.3-V signals bidirectionally when powered at 5 V, but its control inputs (S0–S2) require TTL-compatible levels (V_IL ≤ 0.8 V, V_IH ≥ 2 V), which 3.3-V CMOS outputs satisfy. However, the device itself must be supplied with 4–5.5 V on VCC to ensure proper FET conduction; it does not support 3.3-V VCC operation. The SN74CBT16214 datasheet explicitly defines recommended operating conditions only within that 5-V range.

Does the SN74CBT16214 support hot-swap or live-insertion?

The SN74CBT16214 is not rated for hot-swap operation. Its absolute maximum ratings specify V_CC = –0.5 V to 7 V and input voltage (V_I) = –0.5 V to 7 V, but the device lacks built-in power sequencing protection, current limiting, or precharge circuitry. Applying signal voltages before VCC stabilization risks latch-up or ESD damage. TI recommends powering VCC first and ensuring all control inputs are held valid (VCC or GND) before applying signals - per Section 6.3 of the SN74CBT16214 datasheet.

How many simultaneous connections can the SN74CBT16214 make between ports?

The SN74CBT16214 makes exactly one connection per channel: each of its 12 A-port pins connects exclusively to one corresponding B-port pin (B1, B2, or B3) based on the S0–S2 select code. It cannot connect multiple B-ports to the same A-port simultaneously. Table 1 (Function Table) in the SN74CBT16214 datasheet confirms only one B-port is enabled per channel per select state - e.g., S2S1S0 = 001 enables all 12 B1 connections, while 010 enables all B2 connections.

Is there a pin-compatible replacement for the SN74CBT16214 with enhanced ESD protection?

No pin-compatible replacement with enhanced ESD protection exists for the SN74CBT16214. The SN74CBT16214 has HBM ±1000 V and CDM ±1500 V ratings - standard for this process node. TI's newer bus switches (e.g., SN74CB3Q16214) offer improved ESD (HBM ±4000 V) but use different pinouts, larger packages (VQFN), and require 3.3-V supply. The SN74CBT16214 remains the only TSSOP-56 12-bit 1-of-3 switch with its exact pin mapping and 5-V operation; no drop-in ESD-enhanced alternative is documented in TI's portfolio or cross-reference tools.