STMicroelectronics M74HC368RM13TR

Overview

M74HC368RM13TR from STMicroelectronics is a high-speed CMOS hex bus buffer with 3-state non-inverting outputs, featuring six independent buffers split into two enable-controlled groups (G1 for four channels, G2 for two), 9 ns typical propagation delay at 6 V, ±6 mA output drive, and operation across 2–6 V supply range. It serves in bidirectional data bus isolation and address/data buffering in industrial control logic systems.

For engineers reviewing the M74HC368RM13TR datasheet, M74HC368RM13TR pinout, M74HC368RM13TR application, or M74HC368RM13TR equivalent, key selection criteria include 3-state enable timing (tPZL/tPLZ ≤22 ns at 6 V), rail-to-rail input compatibility (VIH/VIL thresholds defined at 2/4.5/6 V), symmetrical output drive strength, and TSSOP-16 package thermal performance under -55°C to +125°C operating conditions.

Technical Context

The device implements dual independent 3-state enable logic: G1 controls Y1–Y4 outputs, G2 controls Y5–Y6; both enable low. All inputs include silicon-gate C2MOS ESD protection, supporting ±20 mA diode current limits and 10 pF input capacitance.

AC performance is characterized at CL = 50 pF with 6 ns input rise/fall time; propagation delays (tPLH/tPHL) are balanced within 1 ns at 6 V, and high-impedance transition times (tPZL/tPLZ) remain ≤23 ns across full temperature range (-55°C to +125°C).

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free, RoHS-compliant surface-mount outline with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC368PW and 74VHC368M, the M74HC368RM13TR delivers superior high-temperature timing stability and faster typical propagation delay, making it optimal for thermally demanding industrial backplanes and precision instrumentation where sub-10 ns timing consistency is critical.

Availability

M74HC368RM13TR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, medical diagnostic equipment data buses, and test & measurement instrumentation requiring stable component supply across extended temperature ranges.

Supply support for M74HC368RM13TR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, analog ICs, power management devices, and discrete components for industrial, automotive, and consumer markets.

The M74HC368 belongs to ST's high-speed HC logic family, engineered for low-power, high-noise-immunity digital interfacing in harsh-environment embedded systems where reliability across -55°C to +125°C is mandatory.

FAQ

Is M74HC368RM13TR pin-compatible with standard 74LS368?

No. While functionally equivalent as a hex 3-state buffer, M74HC368RM13TR uses CMOS input thresholds (VIH = 3.15 V min. at VCC = 4.5 V), whereas 74LS368 uses bipolar TTL thresholds (VIH = 2.0 V). Direct replacement requires verification of driving source logic levels and may need pull-up resistors on LS outputs.

What is the maximum capacitive load this device can drive reliably?

The M74HC368RM13TR is characterized up to 150 pF load capacitance per output, with propagation delay increasing from 9 ns (50 pF) to 27 ns (150 pF) at VCC = 6 V. For stable operation beyond 150 pF, external series termination or buffer staging is recommended to maintain signal integrity.

Does this part support partial power-down operation?

No. The M74HC368RM13TR lacks Ioff protection; if VCC = 0 V while inputs are driven, current may flow through internal protection diodes. To prevent damage, ensure all inputs are held at GND or use external clamping when VCC is unpowered.

Can G1 and G2 be tied together for single-enable operation?

Yes. Connecting G1 and G2 to a common control signal enables all six outputs simultaneously. This configuration retains full 3-state functionality and does not degrade timing or drive performance, as both enables share identical electrical characteristics per datasheet specifications.