Texas Instruments SN74CBTR16861DL

Overview

SN74CBTR16861DL from Texas Instruments is a 20-bit FET bus switch organized as two independent 10-bit switches, featuring 25-Ω on-state resistance, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and operation over –40°C to 85°C. It enables high-speed bidirectional signal routing in memory expansion and data-path isolation applications with sub-2 ns propagation delay.

For engineers reviewing the SN74CBTR16861DL datasheet, SN74CBTR16861DL pinout, SN74CBTR16861DL application, or SN74CBTR16861DL equivalent, key selection criteria include on-resistance matching across channels, OE-controlled high-impedance isolation timing (ten ≤ 9 ns, tdis ≤ 6.3 ns at 4 V), latch-up immunity (>100 mA per JESD 78 Class II), and SSOP-48 package compatibility with board-level signal integrity requirements.

Technical Context

The SN74CBTR16861DL implements dual 10-bit FET-based transmission gates with separate OE controls per bank, enabling independent enable/disable of port A ↔ port B connections. Each switch exhibits low and matched on-resistance (20–48 Ω) with minimal variation across voltage and current conditions.

It integrates internal 25-Ω series termination to suppress signal reflections without external resistors, supports TTL-level logic thresholds, and maintains high-impedance isolation when OE is high - critical for hot-swap and bus-sharing architectures.

Key Specifications

Pinout & Package

SN74CBTR16861DL uses a 48-pin SSOP (DL) package with 0.630-inch body width, 0.050-inch lead pitch, and JEDEC MO-118 compliance. Pin 1 is located at top-left corner (Q1 quadrant), with GND pins at 12 and 36, VCC at 24 and 48, and dual OE controls at pins 11 (1OE) and 23 (2OE).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTR16861DL, SN74CBT16210DL offers simpler control but halves channel count, while SN74CBTLV16210DL delivers lower on-resistance at the cost of 5-V operation and TTL compatibility - making SN74CBTR16861DL uniquely suited for legacy 5-V bus isolation with dual-bank flexibility.

Availability

SN74CBTR16861DL is available at Aetrix Electronics and suitable for memory expansion interfaces, PCI/ISA bus isolation, JTAG multiplexing, and configurable I/O expansion requiring stable component supply and long-term industrial availability.

Supply support for SN74CBTR16861DL 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, scalability, and system-level integration.

The SN74CBTR16861DL belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, bidirectional signal routing in 5-V digital systems requiring precise timing control and robust ESD/latch-up performance.

FAQ

What is the maximum operating temperature range for the SN74CBTR16861DL?

The SN74CBTR16861DL is rated for operation from –40°C to +85°C ambient temperature, meeting industrial-grade thermal requirements. This range is validated per TI's recommended operating conditions and supported by thermal impedance data (θJA = 63°C/W for DL package), ensuring reliable performance in embedded control and instrumentation environments where SN74CBTR16861DL is deployed.

Does the SN74CBTR16861DL support 3.3-V logic inputs?

No, the SN74CBTR16861DL does not guarantee proper operation with 3.3-V logic inputs. Its control inputs are TTL-compatible with VIH(min) = 2.0 V and VIL(max) = 0.8 V, but it requires VCC = 4–5.5 V for full specification compliance. Applying 3.3-V signals while powering VCC at 5 V is acceptable; however, using 3.3-V VCC is outside datasheet specifications and may cause undefined behavior in SN74CBTR16861DL.

How many independent switch banks does the SN74CBTR16861DL contain?

The SN74CBTR16861DL contains two independent 10-bit switch banks - bank 1 (1A1–1A10 ↔ 1B1–1B10, controlled by 1OE) and bank 2 (2A1–2A10 ↔ 2B1–2B10, controlled by 2OE). This dual-bank architecture allows simultaneous or selective routing of two distinct 10-bit data paths, a key differentiator versus single-bank alternatives like SN74CBT16210DL, and central to SN74CBTR16861DL's role in segmented bus systems.

What is the purpose of the NC pins on the SN74CBTR16861DL?

The SN74CBTR16861DL has NC (No Internal Connection) pins at positions 1 and 48 in the DL package. These pins are physically present but unconnected internally - they must not be tied to VCC, GND, or any signal. Leaving them floating is acceptable; however, grounding them improves mechanical stability and reduces noise coupling. Their presence accommodates package standardization across the Widebus™ family and does not affect SN74CBTR16861DL functionality.

Can the SN74CBTR16861DL be used in hot-swap applications?

Yes, the SN74CBTR16861DL supports hot-swap operation due to its high-impedance isolation state (enabled by OE = high), low charge injection (<10 pC), and robust ESD protection (2000-V HBM). When OE is deasserted before card insertion, SN74CBTR16861DL prevents back-driving of live backplane signals. Its 128 mA continuous channel rating and latch-up immunity (>100 mA) further ensure resilience during transient contact events in SN74CBTR16861DL-based hot-swap architectures.