NXP Semiconductors 74AHCT241D,118

Overview

74AHCT241D,118 from Nexperia is an 8-bit 3-state buffer/line driver with dual independent output enables (1OE active LOW, 2OE active HIGH), TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), and operation over −40 °C to +125 °C. It supports mixed-voltage translation via overvoltage-tolerant inputs (up to 7.0 V) and delivers ±8 mA output drive at 4.5 V–5.5 V supply. It is used in industrial bus interface modules for signal isolation and load driving.

For engineers reviewing the 74AHCT241D,118 datasheet, 74AHCT241D,118 pinout, 74AHCT241D,118 application, or 74AHCT241D,118 equivalent, key selection criteria include TTL-level compatibility, dual 4-bit enable control, SO20 package thermal performance, and high-impedance state timing (tdis ≤ 13.5 ns at 125 °C).

Technical Context

The 74AHCT241D,118 implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated 3-state enable: 1OE (active LOW) governs outputs 1Y0–1Y3, while 2OE (active HIGH) governs 2Y0–2Y3. All inputs feature Schmitt-trigger action for noise immunity and accept voltages up to 7.0 V regardless of VCC, enabling level translation between 3.3 V and 5 V domains.

It operates strictly within 4.5 V–5.5 V supply range with TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), distinguishing it from the CMOS-input 74AHC241 variant. Propagation delay is 3.5–5.7 ns (typ/max, CL = 15 pF, VCC = 5 V), and disable time is specified down to 4.8 ns (typ) with full characterization across −40 °C to +125 °C.

Key Specifications

Pinout & Package

74AHCT241D,118 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, with standard 1.27 mm pitch. Pin 1 is index-marked; pin 10 = GND; pin 20 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT241D,118, the TSSOP alternative offers smaller footprint but requires thermal derating above 60 °C, while the TI SN74AHCT241DBR provides higher ESD margin at slightly relaxed timing - both require no schematic change but may need layout review for thermal or ESD layout practices.

Availability

74AHCT241D,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body controllers, ATE signal routing, and HMI display interfaces requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT241D,118 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

Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

The 74AHCT241D,118 belongs to Nexperia's 74AHCT advanced high-speed CMOS logic family, engineered for robust 5 V TTL-compatible interfacing in harsh industrial and automotive environments.

FAQ

What is the minimum supply voltage required for reliable operation of the 74AHCT241D,118?

The 74AHCT241D,118 requires a minimum supply voltage of 4.5 V for guaranteed TTL-compatible input thresholds and full output drive capability. Operation below 4.5 V is not characterized and may result in undefined VIH/VIL behavior or insufficient VOH/VOL margins. The 74AHCT241D,118 is not rated for 3.3 V operation - use the 74AHC241D for CMOS-level systems.

Can the 74AHCT241D,118 safely interface a 3.3 V microcontroller with a 5 V peripheral bus?

Yes - the 74AHCT241D,118 accepts input voltages from −0.5 V to +7.0 V, independent of VCC. When powered at 5 V, its inputs reliably interpret 3.3 V logic HIGH (≥2.0 V) and LOW (≤0.8 V), making it suitable for unidirectional 3.3 V → 5 V level translation. For bidirectional translation, external direction control or additional buffers are required.

What is the maximum clock/data rate supported by the 74AHCT241D,118 in a 50 pF load configuration?

With CL = 50 pF and VCC = 5 V, the 74AHCT241D,118 exhibits a maximum propagation delay of 7.9 ns and disable time of 13.5 ns. This supports reliable data rates up to ~100 MHz for short-trace, low-skew parallel buses. For sustained high-frequency operation, ensure proper VCC decoupling and minimize trace capacitance to avoid exceeding the 50 pF test condition.

How does the dual-enable architecture of the 74AHCT241D,118 improve system design flexibility?

The 74AHCT241D,118 features two independent 3-state enables: 1OE (active LOW) controls outputs 1Y0–1Y3, and 2OE (active HIGH) controls 2Y0–2Y3. This allows asymmetric bus partitioning - e.g., enabling one 4-bit segment while holding the other in high-Z - enabling dynamic bus segmentation, partial read/write cycles, or fault-isolation schemes without additional logic gates.

Is the 74AHCT241D,118 pin-compatible with the 74AHC241D variant?

Yes - the 74AHCT241D,118 and 74AHC241D share identical pinout, package (SO20), and functional block diagram. However, they differ electrically: 74AHCT241D,118 uses TTL input thresholds (VIH = 2.0 V) and requires 4.5–5.5 V supply, while 74AHC241D uses CMOS thresholds (VIH = 0.7×VCC) and operates from 2.0–5.5 V. Swapping them requires verifying input voltage compatibility and supply constraints.