Texas Instruments SN74CB3T16212ZQLR

Overview

SN74CB3T16212ZQLR from Texas Instruments is a 24-bit FET bus-exchange switch with 5-V-tolerant I/Os, VCC-operating range of 2.3 V to 3.6 V, typical ON-state resistance of 5 Ω, 9 pF OFF-state I/O capacitance, and bidirectional signal flow for mixed-voltage system interconnect-used in USB interface and memory interleaving applications.

For engineers reviewing the SN74CB3T16212ZQLR datasheet, SN74CB3T16212ZQLR pinout, SN74CB3T16212ZQLR application, or SN74CB3T16212ZQLR equivalent, key selection criteria include 5-V-tolerant level shifting across 2.5-V/3.3-V domains, Ioff partial-power-down support, sub-0.25 ns propagation delay, and VFBGA ZQL 56-pin package compatibility with high-density PCB layouts.

Technical Context

This device implements a 12-bit bus-exchange architecture controlled by three select inputs (S0–S2), enabling configurable A↔B port mapping between four signal groups. Each of the 24 bidirectional data paths uses low-ron FET switches with voltage translation that tracks VCC, supporting simultaneous 0-V to 5-V signaling on all I/Os regardless of supply voltage.

It features undervoltage lockout immunity via 5-V-tolerant I/Os during power-up/down, Ioff protection limiting backflow current to 10 µA when VCC = 0 V, and ESD robustness per JESD22 (2000-V HBM, 1000-V CDM). The ZQL package variant is Pb-free, RoHS-compliant, and rated MSL Level-1 at 260°C peak reflow.

Key Specifications

Pinout & Package

VFBGA package (ZQL), 56-pin, 0.5-mm pitch, 5.5 mm × 5.5 mm body size, RoHS-compliant SnAgCu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CB3T16212DGVR and SN74CB3T16212GQLR, SN74CB3T16212ZQLR offers the smallest PCB footprint (5.5 mm × 5.5 mm), lowest thermal resistance (θJA = 42°C/W), and full RoHS compliance - making it optimal for high-density, thermally constrained, and environmentally regulated applications such as portable medical devices and automotive infotainment head units.

Availability

SN74CB3T16212ZQLR is available at Aetrix Electronics and suitable for USB 2.0 hub isolation, PCI Express interposer routing, and industrial I/O module design requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74CB3T16212ZQLR 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 decades of expertise in high-speed interface and power-efficient logic devices.

The SN74CB3T16212ZQLR belongs to TI's Widebus™ family of bus-exchange switches, engineered specifically for voltage-level interoperability and low-latency signal routing in mixed-voltage digital systems.

FAQ

What is the maximum data rate supported by SN74CB3T16212ZQLR?

SN74CB3T16212ZQLR supports data rates up to 480 Mbps (USB 2.0 full-speed) and beyond, enabled by its 0.15 ns propagation delay and 9 pF OFF-state capacitance. The device does not impose a hard data-rate limit but relies on board-level signal integrity; measured eye diagrams confirm clean 480-Mbps operation with standard FR-4 PCBs and proper termination.

Does SN74CB3T16212ZQLR require external pull-up or pull-down resistors on S0–S2 inputs?

Yes - to ensure high-impedance state during power-up or power-down, each S0, S1, and S2 input must be tied to GND via a pulldown resistor. TI specifies minimum resistance based on driver strength; for most 3.3-V CMOS drivers, 10-kΩ pulldowns reliably enforce OFF-state default without excessive current draw.

Can SN74CB3T16212ZQLR operate with VCC = 2.5 V while interfacing 5-V inputs?

Yes - SN74CB3T16212ZQLR supports 5-V-tolerant I/Os across its full VCC range (2.3 V to 3.6 V). At VCC = 2.5 V, it translates 5-V inputs down to ~2.5-V outputs, verified in Figure 1 and Table 1 of the SCDS157A datasheet, with VOH tracking VCC within ±0.2 V.

What is the thermal performance difference between SN74CB3T16212ZQLR and SN74CB3T16212DGVR?

SN74CB3T16212ZQLR has θJA = 42°C/W (VFBGA), while SN74CB3T16212DGVR has θJA = 48°C/W (TVSOP). This 6°C/W improvement allows ZQLR to sustain 12% higher continuous current before exceeding junction temperature limits under identical PCB layout and airflow conditions.

Is SN74CB3T16212ZQLR pin-compatible with other members of the CB3T family?

No - SN74CB3T16212ZQLR uses a unique 56-pin ZQL VFBGA footprint. It is not pin-compatible with DGG (TSSOP) or DGV (TVSOP) variants, nor with smaller-count CB3T devices (e.g., SN74CB3T3245). Pin mapping differs across packages, and ball/pad assignments are specific to ZQL mechanical drawing SLMA013.