Texas Instruments SN74HCT541DWR

Overview

SN74HCT541DWR from Texas Instruments is an octal buffer and line driver IC with 3-state outputs, designed for bus interface and load-driving applications in 5-V digital systems. It operates from 4.5 V to 5.5 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 12 ns, and supports up to 15 LSTTL loads - commonly used in data bus isolation and address/data latching circuits.

For engineers reviewing the SN74HCT541DWR datasheet, SN74HCT541DWR pinout, SN74HCT541DWR application, or SN74HCT541DWR equivalent, key selection criteria include its true-output logic configuration, dual 3-state enable (OE1/OE2) control, TTL-compatible inputs, and SOIC-20 package with input/output separation for optimized PCB routing.

Technical Context

The SN74HCT541DWR implements eight independent non-inverting buffers, each with high-current 3-state outputs controlled by a dual-input NOR gate (OE1 and OE2). When either enable input is high, all outputs enter high-impedance state - enabling bidirectional bus sharing without external logic.

Its HCT logic family ensures TTL-voltage compatibility (VIH = 2 V, VIL = 0.8 V) while maintaining CMOS power efficiency (ICC ≤ 80 µA max), and its data flow-through pinout places all eight inputs on one side and all eight outputs on the opposite side of the SOIC-20 package to minimize trace crossovers.

Key Specifications

Pinout & Package

SN74HCT541DWR is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with 1.27-mm lead pitch and 2.65-mm maximum height. The package features gull-wing leads, RoHS-compliant NiPdAu plating, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30 °C/60% RH).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer and line driver applications.

Compared with SN74HCT541DWR, SN74HCT240DWR provides inverted outputs in identical packaging and drive strength, while SN74LV541APW extends supply range down to 2.0 V but trades off some speed and 5-V drive margin - making SN74HCT541DWR optimal for pure 5-V TTL-compatible bus isolation.

Availability

SN74HCT541DWR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SN74HCT541DWR 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 expertise in industrial, automotive, and communications infrastructure markets.

The SN74HCT541DWR belongs to TI's 74HCT logic family, engineered for robust 5-V system interfacing with TTL compatibility, low power, and high noise immunity - targeting industrial control, test equipment, and legacy system upgrades.

FAQ

What is the operating voltage range for SN74HCT541DWR?

The SN74HCT541DWR operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V TTL and CMOS systems while maintaining specified performance for propagation delay, output drive, and noise margins. Operation outside this range may result in undefined behavior or device damage.

Does SN74HCT541DWR support true or inverted output logic?

The SN74HCT541DWR provides true (non-inverting) output logic: Yn = An when enabled. This distinguishes it from the SN74HCT240 series, which offers inverted outputs. The truth table confirms that each output follows its corresponding input when both OE1 and OE2 are low - a key design requirement for data bus transparency.

How does the dual 3-state enable (OE1/OE2) work on SN74HCT541DWR?

The SN74HCT541DWR uses a NOR-gated dual-enable structure: if either OE1 or OE2 is high, all eight outputs go to high-impedance state. Only when both OE1 and OE2 are low do the outputs actively drive their respective inputs. This architecture simplifies bus arbitration in multi-master systems without requiring external logic gates.

What is the maximum capacitive load SN74HCT541DWR can drive reliably?

The SN74HCT541DWR is characterized for CL = 50 pF and CL = 150 pF in its switching specifications. At 5.5 V supply, typical propagation delay increases from 12 ns (50 pF) to 19 ns (150 pF), confirming stable operation up to 150 pF. For heavier loads, derating or buffering is recommended to maintain timing margins.

Is SN74HCT541DWR pin-compatible with other packages in the same family?

Yes - the SN74HCT541DWR shares identical pinout and functionality with other variants including SN74HCT541DBR (SSOP-20), SN74HCT541NSR (SO-20), and SN74HCT541PWR (TSSOP-20). All follow the same 20-pin functional mapping per the datasheet pin configuration diagram, enabling direct PCB footprint substitution where package height and thermal constraints permit.