Texas Instruments SN74LVCH16541ADLG4

Overview

SN74LVCH16541ADLG4 from Texas Instruments is a noninverting 16-bit buffer/driver with dual 8-bit sections, 3-state outputs, bus-hold inputs, and Ioff partial-power-down support. It operates from 1.65 V to 3.6 V, accepts 5.5-V inputs, delivers 4.2 ns max propagation delay at 3.3 V, and is used in mixed-voltage memory/data bus interfacing between 3.3-V logic and legacy 5-V peripherals.

For engineers reviewing the SN74LVCH16541ADLG4 datasheet, SN74LVCH16541ADLG4 pinout, SN74LVCH16541ADLG4 application, or SN74LVCH16541ADLG4 equivalent, key selection criteria include its dual independent OE control per 8-bit section, 5.5-V-tolerant inputs for level translation, bus-hold elimination of external resistors, and guaranteed high-impedance state during power sequencing.

Technical Context

This device implements two independent 8-bit noninverting buffers, each with two active-low output-enable inputs (e.g., 1OE1/1OE2 for Section 1) requiring both low to activate Y outputs; either high forces all eight Y outputs into high-impedance. The bus-hold circuit maintains valid logic states on undriven A inputs without external biasing.

Ioff protection disables outputs during power-down to prevent backflow current when VCC = 0 V, while input voltage tolerance up to 5.5 V enables reliable interfacing between 3.3-V systems and 5-V signal sources - critical in FPGA-to-ASIC bridging and legacy peripheral expansion.

Key Specifications

Pinout & Package

SN74LVCH16541ADLG4 is packaged in a 48-pin SSOP (DL package), 0.300-inch body width, with 0.025-inch lead pitch and JEDEC MO-153 compliant footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit noninverting buffer applications.

Compared with SN74LVCH16541ADLG4, SN74LVC16244ADGGR offers lower cost but requires external biasing and provides no Ioff protection, while 74ALVC164245DGGR adds bidirectionality at the expense of power-down safety - making SN74LVCH16541ADLG4 optimal for unidirectional, hot-pluggable, or bus-hold–dependent systems.

Availability

SN74LVCH16541ADLG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA peripheral expansion, and test equipment signal routing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74LVCH16541ADLG4 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 logic solutions, with decades of innovation in interface, power, and signal-chain technologies.

The SN74LVCH16541ADLG4 belongs to TI's Widebus™ family of advanced logic devices, engineered for high-speed, low-voltage, mixed-signal system interfacing with emphasis on robustness, voltage translation, and power-aware design.

FAQ

What is the recommended power-up sequence for SN74LVCH16541ADLG4 to ensure reliable 3-state behavior?

TI specifies that OE inputs should be tied to VCC via a pullup resistor during power-up to guarantee high-impedance outputs until system control asserts valid OE logic. For SN74LVCH16541ADLG4, minimum pullup resistance is determined by the driver's current-sinking capability - typically 10 kΩ suffices for most 3.3-V systems. This prevents bus contention before firmware initializes OE control lines.

Does SN74LVCH16541ADLG4 support true 5-V to 3.3-V level translation on its outputs?

No - SN74LVCH16541ADLG4 is a noninverting buffer with 3-state outputs referenced to its own VCC (1.65–3.6 V). While its inputs tolerate 5.5 V, outputs swing only between GND and VCC. For true 5-V output translation, a dedicated level shifter or open-drain buffer with external pullup is required. SN74LVCH16541ADLG4 excels at 5-V-to-3.3-V *input* translation only.

Can bus-hold functionality on SN74LVCH16541ADLG4 be disabled or bypassed?

No - bus-hold is internal and always active on all A inputs of SN74LVCH16541ADLG4; it cannot be disabled via pin or register. TI explicitly warns against using external pullup/pulldown resistors with bus-hold enabled, as they conflict and may cause excessive current draw or metastability. If deterministic biasing is required, select a part without bus-hold, such as SN74LVC16244A.

What thermal derating applies to SN74LVCH16541ADLG4 in a 4-layer PCB with standard copper pour?

For the SSOP (DL) package of SN74LVCH16541ADLG4, θJA is rated at 63°C/W under JEDEC JESD51-7 conditions. With typical 4-layer board layout (2 oz Cu, 75% ground/power plane coverage), actual θJA improves to ~45–50°C/W. At 24 mA per output and full 16-bit toggle, worst-case power dissipation remains below 150 mW - well within safe junction limits up to 85°C ambient.

Is SN74LVCH16541ADLG4 pin-compatible with earlier SN74LVCH16541 variants like the 'A' or 'B' suffix versions?

Yes - SN74LVCH16541ADLG4 is a G4-enhanced version of the SN74LVCH16541A family and maintains identical pinout, electrical behavior, and timing specifications as the base SN74LVCH16541A. The G4 suffix denotes green (lead-free, RoHS-compliant) packaging and updated assembly processes, with no functional or mechanical changes affecting PCB layout or firmware integration.