NXP Semiconductors 74LVT240D,112

Overview

74LVT240D,112 from Nexperia is an octal inverting 3-state buffer/line driver operating at 3.3 V nominal supply, featuring dual independent output enables (1OE, 2OE), ±32 mA / +64 mA drive capability, overvoltage-tolerant inputs up to 5.5 V, and bus-hold circuitry eliminating external pull-ups. It serves as a level-shifting, high-drive interface between 3.3 V logic and 5 V buses in backplane and motherboard data routing.

For engineers reviewing the 74LVT240D,112 datasheet, 74LVT240D,112 pinout, 74LVT240D,112 application, or 74LVT240D,112 equivalent, key selection criteria include its 3.3 V operation with 5 V input tolerance, dual 4-bit 3-state control, bus-hold functionality, propagation delays under 4.3 ns at 3.3 V, and SO20 (SOT163-1) package compatibility with legacy 74-series footprints.

Technical Context

The 74LVT240D implements BiCMOS logic architecture enabling high-speed switching (tPLH/tPHL ≤ 4.3 ns at VCC = 3.3 V) while sustaining robust output drive (+64 mA sink, –32 mA source). Its two independent 3-state enable inputs (1OE, 2OE) allow partitioned bus control-each enabling four outputs-supporting flexible data path management in multi-segment systems.

Input overvoltage tolerance (up to 5.5 V) and IOFF power-down protection permit live insertion and safe operation when VCC is unpowered. Bus-hold circuitry maintains defined logic states on unused inputs without external resistors, reducing BOM count and PCB area in high-pin-count interfaces.

Key Specifications

Pinout & Package

74LVT240D,112 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width, compatible with standard SOIC-20 footprints and reflow soldering profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVT240PW,118, the 74LVT240D,112 offers superior thermal performance and mechanical robustness in industrial environments; versus SN74LVC240APWR, it delivers essential 5 V tolerance, bus-hold, and higher drive-critical for legacy interface and hot-swap use cases.

Availability

74LVT240D,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, test equipment signal conditioning, and legacy system bus interface applications requiring stable component supply, long-term lifecycle support, and SO20 footprint compatibility.

Supply support for 74LVT240D,112 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 semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in industrial and consumer applications.

The 74LVT series targets high-speed, mixed-voltage digital interfacing-designed specifically for bridging 3.3 V logic domains with legacy 5 V systems while maintaining robust ESD immunity and thermal stability.

FAQ

What is the maximum clock frequency supported by 74LVT240D,112 in a data bus application?

The 74LVT240D,112 has a maximum propagation delay of 4.3 ns at VCC = 3.3 V, supporting reliable operation up to approximately 100 MHz in synchronous bus configurations. This assumes controlled trace impedance, proper termination, and ≤50 pF total load capacitance per output-verified in Nexperia's test circuit (Fig. 5, CL = 50 pF).

Can 74LVT240D,112 safely interface with a 5 V microcontroller's GPIO outputs?

Yes. Its inputs tolerate up to 5.5 V regardless of VCC voltage, allowing direct connection to 5 V GPIOs without level shifters. The device will correctly interpret TTL-high (≥2.0 V) and TTL-low (≤0.8 V) signals while operating from a 3.3 V supply, as confirmed in Table 6 (VIH/VIL specifications).

Does 74LVT240D,112 require external pull-up resistors on unused inputs?

No. Integrated bus-hold circuitry actively maintains the last valid logic state on unconnected inputs, eliminating the need for external pull-up or pull-down resistors. This is validated by IBHL/IBHH parameters (±75 μA to ±150 μA) in Table 6 and explicitly stated in Section 1 of the datasheet.

Is the SO20 package of 74LVT240D,112 compatible with standard 74-series footprint libraries?

Yes. The SOT163-1 (SO20) package matches JEDEC MS-013 standards with 1.27 mm lead pitch, 7.5 mm body width, and identical pin 1 location and numbering as legacy 74LS240 SOIC-20 devices-confirmed in Figure 6 and Table 1 of the datasheet.