Texas Instruments SN74AC7541QDGSRQ1

Overview

SN74AC7541QDGSRQ1 from Texas Instruments is an automotive-grade octal buffer IC with open-drain CMOS outputs, dual active-low output enable inputs (OE1/OE2), 1.5V–6V supply range, 24mA continuous output drive at 5V, and 11ns max propagation delay under 5V/50pF load. It serves as a level-shifting and wired-AND bus driver in vehicle body control modules.

For engineers reviewing the SN74AC7541QDGSRQ1 datasheet, SN74AC7541QDGSRQ1 pinout, SN74AC7541QDGSRQ1 application, or SN74AC7541QDGSRQ1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (-40°C to +125°C), wettable-flank VQFN-20 package compatibility with AOI, open-drain output current capability up to 75mA in short bursts, and dual OE control logic requiring both OE1 and OE2 low for output activation.

Technical Context

The SN74AC7541QDGSRQ1 implements eight independent non-inverting buffers sharing two active-low output enable inputs (OE1 and OE2) that must both be asserted low to activate any output. Its open-drain outputs sink current only and require external pull-up resistors for high-level signaling.

It uses standard CMOS inputs with 9pF input capacitance and supports input voltages up to 6V regardless of VCC, enabling robust level translation across mixed-voltage domains. The device operates with 1.5V–6V supply while maintaining specified VOL ≤ 0.5V at IOL = 24mA (5V).

Key Specifications

Pinout & Package

SN74AC7541QDGSRQ1 is packaged in a 20-pin VQFN (RKS) with wettable flanks, 4.5mm × 2.5mm body size, and exposed thermal pad (connected to GND or left floating). The package supports automated optical inspection (AOI) and provides low thermal resistance (RθJB = 40.4°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal open-drain buffer applications.

Compared with SN74AC7541QDGSRQ1, SN74LVC8T245RHLR offers bidirectional translation but sacrifices AEC-Q100 compliance and dual-OE safety, while MC74VHC125DTG provides lower-cost buffering but cannot replace open-drain functionality or meet Grade 1 thermal requirements.

Availability

SN74AC7541QDGSRQ1 is available at Aetrix Electronics and suitable for automotive body control units, powertrain diagnostics interfaces, and ADAS sensor aggregation systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74AC7541QDGSRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and personal electronics markets.

The SN74AC7541QDGSRQ1 belongs to TI's automotive logic portfolio, designed specifically for robust signal conditioning, bus interfacing, and fault-tolerant I/O expansion in safety-critical vehicle subsystems.

FAQ

What is the maximum continuous output current rating for SN74AC7541QDGSRQ1 at 5V?

The SN74AC7541QDGSRQ1 supports 24mA continuous output sink current per channel at 5V, as specified in Section 5.3 Recommended Operating Conditions. This rating ensures stable operation into 50Ω transmission lines or typical LED loads with appropriate series resistance. Exceeding this value continuously risks thermal overstress, though short-burst peaks up to 75mA are permitted per electrical characteristics.

Does SN74AC7541QDGSRQ1 support level shifting between different supply voltages?

Yes, SN74AC7541QDGSRQ1 supports level shifting: its inputs tolerate voltages up to 6V regardless of VCC, and its open-drain outputs can be pulled up to a higher voltage rail (e.g., 5V) while operating from a lower VCC (e.g., 1.8V or 3.3V). This enables unidirectional translation from low-voltage controllers to higher-voltage peripherals without external components, as confirmed in Section 6.3.1 and Table 5.3.

How does the dual output enable (OE1 and OE2) logic work on SN74AC7541QDGSRQ1?

SN74AC7541QDGSRQ1 requires both OE1 and OE2 to be driven low simultaneously to enable output sinking; if either is high, all eight outputs enter high-impedance state. This dual-OE architecture provides redundancy-failure of one enable signal guarantees safe output disable. The function table in Section 6.4 confirms that only L/L input combination yields active outputs, making it ideal for fail-operational automotive designs.

Is SN74AC7541QDGSRQ1 compatible with automatic optical inspection (AOI) systems?

Yes, SN74AC7541QDGSRQ1 in the RKS (VQFN-20) package features wettable flanks, which enhance side-fillet formation during reflow soldering. As documented in Section 6.3.3 and Figure 6-2, this design enables reliable AOI detection of solder joint quality-critical for zero-defect automotive manufacturing. The DGS and PW variants do not include this feature.

What is the recommended bypass capacitor for SN74AC7541QDGSRQ1?

A 0.1µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10) is recommended for SN74AC7541QDGSRQ1, per Section 7.6 Power Supply Recommendations. This value suppresses high-frequency noise and stabilizes supply voltage during switching transients. For enhanced broadband filtering, TI suggests paralleling with a 1µF capacitor, but the 0.1µF unit remains mandatory for core decoupling.