Texas Instruments SN74CBTLV3861DWR

Overview

SN74CBTLV3861DWR from Texas Instruments is a 10-bit high-speed bus switch IC with 5-Ω on-state resistance, rail-to-rail data switching, and I_off partial-power-down support. It operates from 2.3 V to 3.6 V and delivers sub-nanosecond propagation delay (0.15 ns typical at 2.5 V), enabling low-latency signal routing in memory expansion, FPGA I/O bridging, and hot-swap backplane interfaces.

For engineers reviewing the SN74CBTLV3861DWR datasheet, SN74CBTLV3861DWR pinout, SN74CBTLV3861DWR application, or SN74CBTLV3861DWR equivalent, key selection criteria include guaranteed 5-Ω r_on across voltage range, flow-through SOIC-24 layout compatibility, latch-up immunity >100 mA per JESD 78 Class II, and verified I_off leakage <10 µA during power-down.

Technical Context

This device implements ten independent bilateral FET switches in a single-pole, single-throw (SPST) configuration, controlled by a single active-low OE input. Its flow-through architecture places A1–A10 on one side and B1–B10 on the opposite side of the SOIC-24 package, minimizing PCB trace skew and crosstalk.

The switch uses NMOS pass transistors with level-shifted gate drive to achieve rail-to-rail conduction and maintain low r_on across the full 0–3.6 V signal range. I_off protection ensures <10 µA backflow current when V_CC = 0 V and any I/O is biased between 0–3.6 V, satisfying partial-power-down system requirements.

Key Specifications

Pinout & Package

SN74CBTLV3861DWR is housed in a 24-pin SOIC (DW) package measuring 15.4 mm × 7.5 mm × 2.35 mm (max height), with standard 1.27 mm pitch and gull-wing leads. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (260°C peak reflow, unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3861DWR, SN74CBT3244DW offers fewer channels and no I_off guarantee, limiting its use in power-gated systems; SN74LVC1G3157DRYR provides voltage flexibility but incurs 10× footprint and layout overhead versus the integrated 10-bit solution.

Availability

SN74CBTLV3861DWR is available at Aetrix Electronics and suitable for memory expansion, FPGA I/O bridging, and hot-swap backplane interfaces requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74CBTLV3861DWR 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 connectivity technologies, with over 90 years of innovation in high-reliability silicon design.

SN74CBTLV3861DWR belongs to TI's CBTLV (low-voltage BiCMOS bus switch) family, engineered for high-speed, low-distortion signal routing in space-constrained digital systems where timing integrity and power sequencing matter.

FAQ

What is the maximum signal frequency supported by SN74CBTLV3861DWR?

SN74CBTLV3861DWR does not specify a maximum clock frequency, but its 0.15 ns typical propagation delay and 5 Ω r_on support clean signal transmission up to 500 Mbps in parallel bus applications. Signal integrity depends on trace impedance, load capacitance, and driver strength - for 30 pF loads, rise times remain under 100 ps, enabling reliable operation in DDR1/DDR2 control bus roles. SN74CBTLV3861DWR is not intended for continuous RF or serial data streams.

Can SN74CBTLV3861DWR be used with 1.8 V logic?

No. SN74CBTLV3861DWR is specified for 2.3 V to 3.6 V supply operation only. At V_CC = 1.8 V, the internal gate drive fails to fully enhance the pass transistors, resulting in elevated r_on (>20 Ω), increased propagation delay, and potential signal corruption. For 1.8 V systems, consider TI's SN74AVC4T245 or similar AVC-family translators. SN74CBTLV3861DWR requires minimum 2.3 V on V_CC to meet datasheet performance.

How should OE be handled during power-up to ensure high-impedance state?

To guarantee high-impedance state at power-up, OE must be held high until V_CC stabilizes. TI recommends tying OE to V_CC through a pullup resistor; minimum value is determined by the current-sinking capability of the controlling driver. A 10-kΩ resistor is typical. Floating OE or weak pull-down risks momentary switch activation during brown-out, causing bus contention. This requirement applies identically to SN74CBTLV3861DWR and all variants in the family.

Is SN74CBTLV3861DWR pin-compatible with SN74CBTLV3861DBQR?

Yes - SN74CBTLV3861DWR (SOIC-24) and SN74CBTLV3861DBQR (SSOP-24) share identical pin functions and ordering logic, but differ in physical package dimensions, pitch (1.27 mm vs. 0.65 mm), and thermal resistance (θ_JA = 46°C/W vs. 61°C/W). PCB layout, stencil design, and reflow profile must be adjusted accordingly. No electrical or functional incompatibility exists between SN74CBTLV3861DWR and SN74CBTLV3861DBQR.

Does SN74CBTLV3861DWR support hot-plug detection or status reporting?

No. SN74CBTLV3861DWR is a passive analog switch with no built-in monitoring, status outputs, or hot-plug detection circuitry. It provides only OE-controlled ON/OFF switching and I_off-enabled isolation. System-level hot-plug detection must be implemented externally using voltage supervisors, current monitors, or dedicated hot-swap controllers. SN74CBTLV3861DWR performs the isolation function reliably but offers no feedback or telemetry.