Texas Instruments SN74CBTLV1G125DBVR

Overview

SN74CBTLV1G125DBVR from Texas Instruments is a low-voltage single FET bus switch in SOT-23 (DBV) package with 5 pins, 5 Ω on-state resistance, rail-to-rail switching, and I_off support for partial-power-down operation. It functions as a bidirectional signal path controller in high-speed digital interfaces such as memory address/data buses and FPGA I/O expansion.

For engineers reviewing the SN74CBTLV1G125DBVR datasheet, SN74CBTLV1G125DBVR pinout, SN74CBTLV1G125DBVR application, or SN74CBTLV1G125DBVR equivalent, key selection criteria include on-resistance at 2.5 V/3.3 V supply, propagation delay under 0.25 ns, isolation during power-off, and compatibility with 1.8 V–3.3 V logic systems.

Technical Context

The SN74CBTLV1G125DBVR implements a single-channel, NMOS-based analog switch controlled by an active-low enable input (OE). Its FET architecture enables true bidirectional signal flow with no direction pin, supporting data integrity across voltage domains from 0 V to V_CC.

It operates within 2.3 V–3.6 V supply range and features I_off protection that limits leakage to ≤10 µA when V_CC = 0 V and any I/O is biased between 0–3.6 V - critical for hot-swap and multi-rail system interoperability.

Key Specifications

Pinout & Package

SOT-23 (DBV) package, 5-pin, 1.45 mm max height, JEDEC MO-178 compliant, tape-and-reel (3000 pcs/reel), MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV1G125DCKR, the SN74CBTLV1G125DBVR offers identical switching performance in a slightly larger but thermally superior SOT-23 package (θ_JA = 206°C/W vs. 252°C/W); versus SN74LVC1G3157DBVR, it delivers lower on-resistance and guaranteed I_off, making it the only choice for hot-swap and multi-rail isolation.

Availability

SN74CBTLV1G125DBVR is available at Aetrix Electronics and suitable for memory bus isolation, FPGA I/O expansion, hot-swappable module interfaces, and low-voltage logic translation requiring stable component supply across industrial, computing, and communications platforms.

Supply support for SN74CBTLV1G125DBVR 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 electronic components.

The SN74CBTLV1G125DBVR belongs to TI's CBTLV (low-voltage BiCMOS transistor logic) bus switch family, engineered specifically for high-speed, low-power signal routing in portable and space-constrained digital systems.

FAQ

What is the maximum recommended supply voltage for SN74CBTLV1G125DBVR?

The absolute maximum V_CC rating for SN74CBTLV1G125DBVR is 4.6 V, but the recommended operating range is strictly 2.3 V to 3.6 V per TI's SCDS057H datasheet. Exceeding 3.6 V may cause accelerated parametric drift or latch-up, especially under hot conditions. For long-term reliability in production designs, SN74CBTLV1G125DBVR should be operated within its recommended range - not the absolute maximum.

Does SN74CBTLV1G125DBVR support bidirectional signal flow?

Yes, SN74CBTLV1G125DBVR supports fully bidirectional signal flow between pins A and B when OE is low. Its FET-based architecture has no intrinsic directionality - voltage can propagate from A to B or B to A with identical r_on, t_pd, and C_io characteristics. This makes SN74CBTLV1G125DBVR ideal for shared-bus applications like memory data lines or JTAG daisy chains where signal direction changes dynamically.

How does the I_off feature of SN74CBTLV1G125DBVR protect system-level power domains?

The I_off feature of SN74CBTLV1G125DBVR limits current flow to ≤10 µA when V_CC = 0 V and any I/O pin is biased between 0–3.6 V. This prevents backfeed from powered rails into unpowered sections - critical in partial-power-down scenarios such as CPU sleep states or modular card removal. The specification is tested and guaranteed per JEDEC JESD78, ensuring SN74CBTLV1G125DBVR meets IPC-6012 Class 2 reliability requirements for industrial backplanes.

What is the typical on-state resistance of SN74CBTLV1G125DBVR at 2.5 V supply?

At V_CC = 2.5 V, the typical on-state resistance (r_on) of SN74CBTLV1G125DBVR is 7 Ω, with a maximum of 10 Ω across temperature and process variation. This value is measured with 15 mA test current and referenced to the lower of the two terminal voltages (A or B), per TI's SCDS057H characterization methodology. At 20 mA drive, this yields <200 mV total drop - sufficient to maintain noise margins in 2.5 V LVTTL and LVCMOS systems using SN74CBTLV1G125DBVR.

Can SN74CBTLV1G125DBVR be used without a pull-up resistor on the OE pin?

No - SN74CBTLV1G125DBVR requires a pull-up resistor on the OE pin to ensure high-impedance state during power-up and power-down transients. TI specifies that OE must be tied to V_CC through a pull-up; minimum resistance depends on driver sink capability but typically ranges from 4.7 kΩ to 10 kΩ. Without it, undefined OE state may cause momentary bus contention or signal corruption - a known failure mode documented in TI application report SCBA004, which applies directly to SN74CBTLV1G125DBVR.