Texas Instruments SN74LV541APWR

Overview

SN74LV541APWR 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 5 ns max 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 SN74LV541APWR datasheet, SN74LV541APWR pinout, SN74LV541APWR application, or SN74LV541APWR equivalent, key selection criteria include its 2–5.5 V wide supply range, 3-state drive capability per channel, I_off protection for hot-insertion, ground-bounce immunity (< 0.8 V at 3.3 V), and TSSOP-20 package compatibility with high-density PCB layouts.

Technical Context

The SN74LV541APWR implements eight independent non-inverting buffers, each with CMOS-compatible input thresholds and balanced push-pull 3-state outputs. Its dual OE inputs feed an internal AND gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance mode, enabling flexible bus arbitration.

It integrates I_off circuitry that disables outputs when V_CC = 0 V, preventing backflow current during partial power-down. Input and output structures include negative clamp diodes only, and the device meets JESD17 latch-up >250 mA - confirming robustness in industrial and embedded environments.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50 mm × 7.8 mm body, 0.65 mm pitch, exposed pad optional (not electrically required), RoHS-compliant, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV541APWR, SN74LVC541APWR offers better speed and lower voltage flexibility but lacks I_off protection critical for system-level power sequencing, while 74LVX541MTCX omits both I_off and extended temperature support - making SN74LV541APWR the sole choice for robust industrial hot-swap designs.

Availability

SN74LV541APWR is available at Aetrix Electronics and suitable for network switches, surveillance cameras, automotive infotainment systems, and smart grid RTUs requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for SN74LV541APWR 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 industrial, automotive, and communications markets.

The SN74LV541APWR belongs to TI's LV logic family - engineered for low-voltage operation (2–5.5 V), high noise immunity, and robust 3-state bus interface performance in mission-critical embedded systems.

FAQ

What is the maximum capacitive load the SN74LV541APWR can drive while maintaining specified timing?

The SN74LV541APWR is characterized for loads up to 50 pF across all V_CC levels (2.5 V, 3.3 V, 5 V) and temperature ranges. At 50 pF and 5 V, t_pd remains ≤6 ns. Driving >50 pF increases propagation delay nonlinearly and may violate setup/hold margins in high-speed buses - TI recommends limiting total trace + receiver capacitance to ≤50 pF for guaranteed specification compliance in the SN74LV541APWR.

How should unused inputs be terminated on the SN74LV541APWR?

All unused inputs on the SN74LV541APWR - including A1–A8 and OE1/OE2 - must be tied to either V_CC or GND to prevent floating states that cause excessive ICC, oscillation, or undefined outputs. TI specifies a 10-kΩ pull-up or pull-down resistor as standard practice; direct connection is acceptable if the signal source is permanently inactive. Leaving any input unconnected violates the Recommended Operating Conditions and risks functional failure.

Does the SN74LV541APWR support hot-plug or partial-power-down operation?

Yes - the SN74LV541APWR includes I_off circuitry that actively disables all outputs when V_CC = 0 V, limiting leakage to ≤5 µA per I/O. This prevents damaging back-current flow from live buses into a powered-down SN74LV541APWR, enabling safe insertion/removal in systems with staggered power sequencing - a requirement confirmed in Section 8.3.2 of the official SN74LV541APWR datasheet.

What is the function of the dual OE inputs (OE1 and OE2) on the SN74LV541APWR?

The SN74LV541APWR uses OE1 and OE2 as active-low inputs feeding an internal AND gate: if either OE1 or OE2 is high, all eight Y outputs enter high-impedance mode. This allows two independent control domains - e.g., OE1 for CPU-initiated bus release and OE2 for DMA controller arbitration - without external logic. The function is explicitly defined in Table 8-1 (Function Table) and Figure 8-1 (Logic Diagram) of the SN74LV541APWR datasheet.

Can the SN74LV541APWR be used to interface 5 V logic to a 3.3 V microcontroller?

Yes - the SN74LV541APWR accepts input voltages up to 5.5 V independent of V_CC, so 5 V signals applied to A1–A8 are safely translated to 3.3 V-compatible outputs when V_CC = 3.3 V. Its mixed-mode operation is explicitly stated in Feature #5 and Section 8.3.1. However, outputs remain referenced to V_CC; thus, Y1–Y8 swing 0–3.3 V, matching the microcontroller's input thresholds without level-shifting components.