Texas Instruments SN74AHC16541DLR

Overview

SN74AHC16541DLR from Texas Instruments is a noninverting 16-bit buffer/driver with dual 3-state output-enable control per 8-bit section, operating from 2 V to 5.5 V, delivering ±8 mA drive strength at 5 V, and featuring flow-through pinout for optimized PCB layout in industrial bus interface applications.

For engineers reviewing the SN74AHC16541DLR datasheet, SN74AHC16541DLR pinout, SN74AHC16541DLR application, or SN74AHC16541DLR equivalent, key selection considerations include its 48-pin SSOP (DL) package, dual independent OE control per octet, high-speed propagation delay (≤6.5 ns at 5 V, CL = 15 pF), and guaranteed operation from –40°C to 85°C.

Technical Context

The SN74AHC16541DLR implements two independent 8-bit noninverting buffer sections, each with two active-low output-enable inputs (e.g., 1OE1/1OE2 for first octet); both enables must be low for that section's Y outputs to reflect A inputs. Outputs enter high-impedance state if either OE is high.

It uses TI's EPIC™ (Enhanced-Performance Implanted CMOS) process, features distributed V_CC/GND pins to suppress switching noise, and supports flow-through architecture-inputs on one side, outputs on the opposite-to minimize trace crossovers and signal integrity degradation in dense digital backplanes.

Key Specifications

Pinout & Package

SN74AHC16541DLR is housed in a 48-pin Shrink Small-Outline Package (SSOP, DL), 12.6 mm × 6.2 mm body, 0.5 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant, with gull-wing leads and pin 1 quadrant Q1 orientation in tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCH16541ADGGR and 74ALVC16541DGGR, the SN74AHC16541DLR uniquely supports full 2–5.5 V operation and 5 V-tolerant I/O - making it the only choice for legacy 5 V industrial backplanes coexisting with modern 3.3 V controllers.

Availability

SN74AHC16541DLR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded memory expansion buses, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SSOP packaging.

Supply support for SN74AHC16541DLR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74AHC16541DLR belongs to TI's Widebus™ family of high-speed, low-power logic devices designed specifically for robust, noise-immune parallel data path interfacing in mission-critical industrial and automotive control systems.

FAQ

What is the maximum clock frequency supported by SN74AHC16541DLR in a data bus application?

The SN74AHC16541DLR does not contain internal clocks or timing circuitry-it is a static logic buffer. Its usable data rate depends on propagation delay and system-level timing margins. At V_CC = 5 V and C_L = 15 pF, t_PLH/t_PHL ≤6.5 ns, supporting reliable operation in bus cycles with ≥15 ns minimum pulse width-equivalent to effective data rates up to ~65 MHz for single-cycle transfers. The SN74AHC16541DLR must be used with externally generated control signals.

Can SN74AHC16541DLR safely interface a 3.3 V microcontroller to a 5 V peripheral?

Yes. The SN74AHC16541DLR accepts input voltages up to V_CC + 0.5 V and operates across 2–5.5 V, making it fully 5 V-tolerant when powered at 3.3 V or 5 V. When V_CC = 3.3 V, inputs up to 5.5 V are safe, and outputs swing rail-to-rail-ensuring clean 3.3 V or 5 V logic levels as required. This capability is explicitly confirmed in the absolute maximum ratings and recommended operating conditions of the SN74AHC16541DLR datasheet.

How should unused input pins be handled on SN74AHC16541DLR?

All unused inputs on the SN74AHC16541DLR-including OE and A pins-must be tied to a valid logic level (V_CC or GND) to prevent floating nodes, increased power consumption, or erratic output behavior. TI's application report SCBA004 explicitly mandates this practice. For OE pins, tying to V_CC via a pullup resistor ensures default high-impedance output state at power-up; the SN74AHC16541DLR datasheet specifies minimum resistor value based on driver sink capability.

Is SN74AHC16541DLR pin-compatible with other 48-pin Widebus™ buffers like SN74AHC16244?

No. Although both are 48-pin Widebus™ devices, the SN74AHC16541DLR has a unique flow-through pinout (inputs on left, outputs on right) and dual OE per octet, whereas SN74AHC16244 uses a different pin mapping with single OE per octet and non-flow-through arrangement. Pinouts are not interchangeable-PCB redesign is required. Always verify against the specific DL-package pin diagram in the SN74AHC16541DLR datasheet before substitution.

What thermal derating applies to SN74AHC16541DLR in continuous operation?

The SN74AHC16541DLR has a package thermal impedance θ_JA of 63°C/W in the DL (SSOP) package. At maximum ambient temperature (85°C) and V_CC = 5.5 V, total power dissipation must remain below ~0.8 W to keep junction temperature ≤150°C. With typical C_pd = 12 pF and f = 10 MHz, dynamic power is ~0.6 mW per bit-well within limits. Derating is only necessary under worst-case DC loading (e.g., all outputs sourcing/sinking ±8 mA continuously), where power exceeds 100 mW and board-level heatsinking or airflow becomes critical for the SN74AHC16541DLR.