Texas Instruments SN74CBTLV3245ADWG4

Overview

SN74CBTLV3245ADWG4 from Texas Instruments is a low-voltage octal FET bus switch in 20-pin TSSOP (PW) package, providing bidirectional 8-bit signal routing with 5 Ω typical on-state resistance, rail-to-rail switching, and I_off support for partial-power-down operation. It functions as a high-speed, low-latency isolation switch in data path management for enterprise computing and wired networking systems.

For engineers reviewing the SN74CBTLV3245ADWG4 datasheet, SN74CBTLV3245ADWG4 pinout, SN74CBTLV3245ADWG4 application, or SN74CBTLV3245ADWG4 equivalent, key selection criteria include its 2.3–3.6 V supply range, sub-0.25 ns propagation delay, ±2000 V HBM ESD rating, and compatibility with standard '245-type PCB layouts requiring minimal board space and no external biasing components.

Technical Context

The SN74CBTLV3245ADWG4 implements eight independent FET-based analog switches controlled by a single active-low output enable (OE) input. When OE is low, A-port pins are directly connected to corresponding B-port pins with near-zero voltage drop across the channel; when OE is high, both ports enter high-impedance isolation mode.

Its I_off feature ensures leakage current remains below 40 µA when V_CC = 0 V and any I/O is biased between 0–3.6 V, enabling safe hot-insertion and power sequencing in multi-rail systems. The device operates across –40°C to +85°C ambient temperature and supports rail-to-rail signal swing without level translation.

Key Specifications

Pinout & Package

SN74CBTLV3245ADWG4 uses the PW (TSSOP-20) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, 1.2 mm max height, with gull-wing leads and exposed thermal pad not present in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3245PWR, SN74CBTLV3245ADWG4 offers identical switching performance but differs in packaging format and reel compatibility; versus SN74LVC245APW, it delivers 10× faster propagation, 3× lower on-resistance, and essential I_off protection - making it uniquely suited for high-speed, power-aware bus isolation.

Availability

SN74CBTLV3245ADWG4 is available at Aetrix Electronics and suitable for datacenter server backplanes, industrial Ethernet gateways, and building automation controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74CBTLV3245ADWG4 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 decades of expertise in high-performance logic and interface solutions.

The SN74CBTLV3245A product line delivers ultra-low-latency, low-power bus switching for next-generation computing and industrial infrastructure - designed specifically for applications demanding nanosecond timing precision, rail-to-rail signal fidelity, and robust partial-power-down behavior.

FAQ

What is the maximum operating voltage for SN74CBTLV3245ADWG4?

The absolute maximum supply voltage for SN74CBTLV3245ADWG4 is 4.6 V, but its recommended operating range is 2.3 V to 3.6 V. Operating outside this range may degrade switching performance or reliability. The device supports rail-to-rail signal swing within this supply window, enabling direct interfacing with 2.5 V and 3.3 V logic families without level translation. Always observe the 4.6 V absolute maximum limit to prevent permanent damage.

Does SN74CBTLV3245ADWG4 require external pull-up resistors on the OE pin?

Yes - SN74CBTLV3245ADWG4 requires an external pull-up resistor on the OE pin to V_CC to ensure a defined high-impedance state during power-up or power-down sequences. TI specifies that OE must be tied to V_CC through a pullup resistor; the minimum value depends on the driver's current-sinking capability. Failure to do so risks undefined switch states, increased current consumption, or signal contention. This requirement applies to all operating conditions of SN74CBTLV3245ADWG4.

Can SN74CBTLV3245ADWG4 be used for analog signal switching?

Yes - SN74CBTLV3245ADWG4 is a FET-based analog bus switch capable of passing analog signals within its voltage and bandwidth limits. Its 5 Ω on-resistance, 9 pF off-capacitance, and rail-to-rail operation make it suitable for low-distortion switching of DC-coupled digital signals and moderate-frequency analog waveforms (e.g., audio clocks, encoder quadrature, sensor outputs). However, it is not optimized for RF or high-fidelity audio; verify signal integrity at target frequency using SN74CBTLV3245ADWG4's specified t_pd and r_on values.

What is the thermal performance of SN74CBTLV3245ADWG4 in its TSSOP package?

SN74CBTLV3245ADWG4 in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (R_θJA) of 105.9°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with 2 oz copper and no internal planes. For continuous 8-channel operation at 64 mA per switch, total power dissipation remains below 25 mW - well within safe thermal limits even in enclosed industrial enclosures. Derating is not required below +85°C ambient when using standard PCB layout practices.

Is SN74CBTLV3245ADWG4 compatible with hot-swap applications?

Yes - SN74CBTLV3245ADWG4 supports hot-swap operation via its I_off feature, which limits leakage current to ≤40 µA when V_CC = 0 V and I/O pins are biased between 0–3.6 V. This prevents damaging back-current flow into a powered-down domain, enabling safe insertion/removal of daughter cards or modules in live backplanes. System-level hot-swap compliance also requires proper sequencing of V_CC, OE, and signal lines - all supported by SN74CBTLV3245ADWG4's architecture.