Texas Instruments SN74CBTLV3861PWE4

Overview

SN74CBTLV3861PWE4 from Texas Instruments is a 10-bit high-speed bus switch IC with 5-Ω on-state resistance, rail-to-rail signal 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 typ at 2.5 V), enabling low-latency data path isolation in memory expansion and FPGA I/O buffering applications.

For engineers reviewing the SN74CBTLV3861PWE4 datasheet, SN74CBTLV3861PWE4 pinout, SN74CBTLV3861PWE4 application, or SN74CBTLV3861PWE4 equivalent, key selection criteria include guaranteed 5 Ω r_on across voltage range, flow-through pinout for PCB layout optimization, I_off leakage <10 µA during power-down, and TSSOP-24 package compatibility with high-density routing.

Technical Context

This device implements a passive FET-based bus switch architecture-no internal logic or level translation-enabling bidirectional, voltage-transparent signal routing between A and B ports. Its OE-controlled enable/disable behavior provides deterministic high-impedance isolation without latch-up risk (exceeds 100 mA per JESD 78 Class II).

The flow-through pinout (A1–A10 left side, B1–B10 right side, OE/VCC/GND centrally located) minimizes trace skew and crosstalk in parallel bus implementations. I_off protection ensures no backflow current when V_CC = 0 V and port voltages range from 0 to 3.6 V, supporting hot-swap and partial-power-down system architectures.

Key Specifications

Pinout & Package

TSSOP-24 (PW) package: 7.8 mm × 4.4 mm, 1.2 mm max height, 0.65 mm pitch, lead-free NiPdAu finish, MSL Level-1 (260°C, unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3861PWE4, SN74CBT3244DBR offers reduced pin count and area but lacks 10-bit width and sub-0.2 ns t_pd; SN74LVC1G3157DCKR provides superior flexibility per channel yet incurs significant layout overhead and timing skew in parallel configurations.

Availability

SN74CBTLV3861PWE4 is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA I/O buffering, hot-swappable module interconnects, and test access port multiplexing requiring stable component supply, industrial temperature operation, and long-term lifecycle continuity.

Supply support for SN74CBTLV3861PWE4 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 digital signal technologies, with decades of expertise in high-reliability logic and interface solutions.

The SN74CBTLV3861PWE4 belongs to TI's CBTLV (CrossBar TTL) bus switch family, engineered for ultra-low on-resistance and nanosecond-speed signal routing in high-density digital systems.

FAQ

What is the maximum operating frequency supported by the SN74CBTLV3861PWE4?

The SN74CBTLV3861PWE4 does not specify a maximum clock frequency because it is an analog bus switch-not a clocked logic device. Its 0.15 ns typical propagation delay (t_pd) enables reliable operation with data edges faster than 5 GHz, making it suitable for DDR2/DDR3 address/control buses and high-speed FPGA interconnects where signal integrity depends on minimal r_on and C_io.

Can the SN74CBTLV3861PWE4 be used with 1.8 V logic signals?

No-the SN74CBTLV3861PWE4 requires V_CC between 2.3 V and 3.6 V and is not rated for 1.8 V operation. Applying 1.8 V signals while V_CC ≥ 2.3 V is acceptable for rail-to-rail switching, but the device itself cannot be powered from 1.8 V. For 1.8 V systems, consider TI's SN74AVC series or dedicated level translators instead of the SN74CBTLV3861PWE4.

How should OE be handled during power-up to ensure defined 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 pull-up resistor; minimum value is determined by the driver's current-sinking capability. For robustness, use a 10 kΩ resistor and avoid leaving OE floating-undefined OE state may cause momentary bus contention before power stabilization in the SN74CBTLV3861PWE4.

Does the SN74CBTLV3861PWE4 support hot-swap applications?

Yes-the SN74CBTLV3861PWE4 is explicitly designed for hot-swap use via its I_off feature: when V_CC = 0 V, leakage remains ≤10 µA even with port voltages up to 3.6 V. This prevents back-current flow into unpowered sections, satisfying key safety requirements for modular backplane and pluggable card architectures using the SN74CBTLV3861PWE4.

Is there an automotive-qualified version of the SN74CBTLV3861PWE4?

Yes-the SN74CBTLV3861-Q1 is the AEC-Q100 qualified automotive variant of this device, rated for −40°C to +125°C operation and manufactured under TS 16949 processes. It shares identical electrical specifications and pinout with the SN74CBTLV3861PWE4 but adds extended reliability testing, enhanced traceability, and automotive-specific qualification documentation.