Texas Instruments CD74HCT240M96

Overview

CD74HCT240M96 from Texas Instruments is an inverting octal buffer/line driver with dual active-low three-state output enables, designed for bidirectional bus interfacing in 5-V TTL-compatible digital systems. It delivers 8ns typical propagation delay at V_CC = 5 V, CL = 15 pF, supports ±25 mA output drive per channel, operates across –55°C to +125°C, and features buffered inputs with high-noise immunity (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V).

For engineers reviewing the CD74HCT240M96 datasheet, CD74HCT240M96 pinout, CD74HCT240M96 application, or CD74HCT240M96 equivalent, this page provides verified functional identity, SOIC-20 package mapping, three-state timing behavior, LSTTL input compatibility, and real-world bus isolation use cases - all confirmed against TI's SCHS167G revision G datasheet.

Technical Context

The CD74HCT240M96 implements two independent 4-bit inverting buffers, each controlled by its own active-low output enable (1OE, 2OE). All eight outputs enter high-impedance state when either enable is asserted low, enabling true bus contention avoidance in shared-data-path architectures.

Its HCT logic family ensures direct compatibility with standard TTL input thresholds while maintaining CMOS power efficiency. Input leakage remains ≤ ±1 μA at V_CC = 5.5 V, and three-state leakage is ≤ ±5 μA over full temperature range - critical for low-power hold states in industrial control backplanes.

Key Specifications

Pinout & Package

CD74HCT240M96 is packaged in a 20-pin SOIC (Small Outline Integrated Circuit) with 12.80 mm × 7.50 mm body size, 1.27 mm lead pitch, and surface-mount footprint compatible with IPC-7351B SOIC20_NOM.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HCT240M96, SN74HCT240N offers mechanical compatibility with breadboard and socket-based development but sacrifices thermal efficiency, while 74HCT240PW delivers footprint reduction at the cost of assembly complexity - both retain identical logic function and timing behavior.

Availability

CD74HCT240M96 is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive ECU bus isolation, ATE pattern generation, and legacy instrumentation data extension requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HCT240M96 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 decades of heritage in high-reliability logic families.

CD74HCT240M96 belongs to TI's CD74HCT high-speed CMOS logic series, engineered for robust 5-V TTL-compatible interfacing in industrial, automotive, and test equipment where noise immunity, wide temperature operation, and bus contention control are critical.

FAQ

What is the maximum clock/data rate supported by CD74HCT240M96?

The CD74HCT240M96 is not a clocked device but a combinational buffer; its usable data rate depends on propagation delay and load. With 9 ns typical t_PD and 33 ns max, it reliably supports asynchronous bus cycles up to ~20 MHz in systems with moderate capacitive loading (≤50 pF), as confirmed in TI's SCHS167G switching characteristics tables.

Does CD74HCT240M96 require external pull-up or pull-down resistors on unused inputs?

Yes - per TI's layout guidelines, all unused inputs on CD74HCT240M96 must be tied to V_CC or GND to prevent floating states that cause undefined outputs and increased ICC. For inverting buffers, tying unused inputs to GND ensures predictable low output; tying to V_CC forces high output, both avoiding oscillation and excess current draw.

Can CD74HCT240M96 be used with 3.3-V microcontrollers?

No - CD74HCT240M96 is specified only for 4.5 V to 5.5 V operation and requires TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V). A 3.3-V MCU may not reliably drive it without a level shifter, as its VOH (typically ~3.0 V) falls below the 2.0-V minimum VIH requirement under worst-case conditions.

What is the recommended bypass capacitor for CD74HCT240M96?

Texas Instruments recommends a 0.1-μF ceramic capacitor placed as close as possible to the V_CC pin (pin 20) of CD74HCT240M96 to suppress high-frequency supply noise. For enhanced broadband filtering, a parallel 1-μF capacitor is acceptable - both must be low-ESR types and mounted within 2 mm of the pin per TI's power supply recommendations.

Is CD74HCT240M96 pin-compatible with CD74HC240M96?

Yes - CD74HCT240M96 and CD74HC240M96 share identical pinout, package (SOIC-20), and functional block diagram. The key difference is logic family: HCT guarantees TTL input compatibility (4.5–5.5 V only), while HC supports 2–6 V operation but lacks guaranteed LSTTL threshold matching - making them electrically interchangeable only in 5-V systems with verified input drive strength.