Texas Instruments SN74LV541APWT

Overview

SN74LV541APWT from Texas Instruments is an octal non-inverting 3-state buffer/driver IC designed for bus interface and memory address buffering in mixed-voltage systems. It operates across 2-V to 5.5-V V_CC, delivers ≤6 ns propagation delay at 5 V, supports partial-power-down via I_off, and features dual active-low output-enable inputs (OE1/OE2) for independent group control - used in network switches, surveillance cameras, and infotainment head units.

For engineers reviewing the SN74LV541APWT datasheet, SN74LV541APWT pinout, SN74LV541APWT application, or SN74LV541APWT equivalent, key selection criteria include its 20-pin TSSOP (PW) package, 3.3-V/5-V bus driving capability, ground-bounce immunity (<0.8 V VOLP), and compatibility with industrial temperature range (–40°C to 125°C).

Technical Context

The SN74LV541APWT implements eight independent non-inverting buffers, each with CMOS-compatible input thresholds and balanced push-pull outputs capable of sourcing/sinking up to ±16 mA at 5 V. Its dual OE architecture enables two 4-channel groups, where either OE1 or OE2 high forces all associated outputs into high-impedance state.

It integrates I_off circuitry that disables outputs when V_CC = 0 V, preventing backflow current during partial power-down. Input and output clamping diodes meet JESD17 latch-up >250 mA, and noise characteristics (VOLP <0.8 V, VOHV >2.3 V at 3.3 V) are validated per JEDEC test conditions.

Key Specifications

Pinout & Package

SN74LV541APWT is packaged in a 20-pin TSSOP (PW) measuring 6.50 mm × 7.8 mm with 0.65-mm pitch. The package includes exposed thermal pad (RKS variant only); for PW, thermal dissipation relies on PCB copper area connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74LV541APWT, SN74LVC541APW sacrifices 5-V compatibility for lower power, while 74LVX541MTCX trades dual-OE flexibility and speed for legacy footprint reuse - neither offers pin-to-pin or functional drop-in replacement without design validation.

Availability

SN74LV541APWT is available at Aetrix Electronics and suitable for network switches, surveillance cameras, and infotainment head units requiring stable component supply across automotive, industrial, and consumer electronics production cycles.

Supply support for SN74LV541APWT 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 over 50 years of innovation in high-reliability interface and power management ICs.

The SN74LV541APWT belongs to TI's LV logic family, engineered for low-voltage, high-speed bus interface in mixed-supply systems - targeting cost-sensitive, thermally constrained applications where robustness and voltage flexibility are critical.

FAQ

What is the maximum capacitive load the SN74LV541APWT can drive while meeting datasheet timing specs?

The SN74LV541APWT is fully characterized for loads up to 50 pF, as confirmed in Section 6.6–6.8 of the datasheet. At 5 V and 15-pF load, t_pd remains ≤6 ns; exceeding 50 pF increases propagation delay and may degrade edge integrity. For heavier loads, add series damping resistors or consider buffer fanout splitting - the SN74LV541APWT itself does not specify performance beyond 50 pF in production data.

Does the SN74LV541APWT support true 5-V operation including input tolerance and output drive?

Yes. The SN74LV541APWT supports V_CC = 5 V ±0.5 V, delivers VOH ≥3.8 V at –16 mA, and accepts VI up to 5.5 V on all inputs regardless of V_CC. This allows direct interfacing with 5-V TTL/CMOS peripherals without level translation - verified in Sections 6.3 (Recommended Operating Conditions) and 6.5 (Electrical Characteristics).

How should unused inputs be handled on the SN74LV541APWT?

All unused inputs on the SN74LV541APWT must be tied to V_CC or GND - floating inputs cause undefined logic states, increased ICC, and potential oscillation. TI recommends 10-kΩ pull-up/down resistors for unused A1–A8 or OE1/OE2 pins, as specified in Section 6.3 Note (1) and Application Report SCBA004.

Can both OE1 and OE2 be used simultaneously to disable all eight outputs?

Yes. The SN74LV541APWT's output-enable logic is an AND gate: if either OE1 or OE2 is high, the corresponding four outputs go high-impedance. Driving both OE1 and OE2 high disables all Y1–Y8 outputs - confirmed in Table 8-1 (Function Table) and Section 8.1. This provides redundant control or synchronized bus release in multi-master systems.

Is the SN74LV541APWT pin-compatible with other TSSOP-20 octal buffers like the SN74LV244A?

No. Although both use 20-pin TSSOP (PW), the SN74LV541APWT has dual OE inputs (pins 1 and 19) and separate input/output sides (A1–A8 on left, Y1–Y8 on right), whereas SN74LV244A uses single OE (pin 1) and different pin mapping. Pinouts differ per Figures 5-1 and 5-2 - direct substitution requires PCB redesign.