STMicroelectronics M74HC366RM13TR

Overview

M74HC366RM13TR from STMicroelectronics is a high-speed CMOS hex bus buffer with inverting 3-state outputs, designed for bidirectional data bus isolation in digital systems. It features propagation delay of 10 ns (typ. at VCC = 6 V), supply voltage range of 2–6 V, symmetrical output drive (±6 mA), and dual active-low enable inputs (G1, G2) controlling all six channels simultaneously. Used in microcontroller address/data bus buffering and memory interface isolation.

For engineers reviewing the M74HC366RM13TR datasheet, M74HC366RM13TR pinout, M74HC366RM13TR application, or M74HC366RM13TR equivalent, key selection criteria include guaranteed 3-state timing (tPZL/tPLZ ≤ 39 ns at 4.5 V), input noise immunity (VNIH/VNIL ≥ 28% VCC), and TSSOP-16 package compatibility with high-density PCB layouts.

Technical Context

The M74HC366RM13TR implements six independent inverting buffers, each with high-impedance (Z) output control governed exclusively by the logical AND of two active-low enables (G1 ∧ G2). No internal latching or clocking - purely combinational logic with defined DC and AC behavior across industrial temperature range (−55°C to +125°C).

All inputs include silicon-gate C2MOS protection against ESD and transient overvoltage; outputs exhibit matched rise/fall times (tTLH ≈ tTHL) and balanced sourcing/sinking capability (|IOH| = IOL ≥ 6 mA), enabling clean signal integrity in shared-bus environments without external termination.

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 1.2 mm max height, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC366N and 74VHC366FT, the M74HC366RM13TR offers optimal balance of industrial temperature range, proven noise immunity, and compact TSSOP packaging - making it preferred for production-grade embedded controllers where reliability outweighs marginal speed gains.

Availability

M74HC366RM13TR is available at Aetrix Electronics and suitable for microcontroller bus isolation, memory address latching, industrial PLC I/O expansion, and digital test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC366RM13TR 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, specializing in automotive, industrial, and power management ICs with strong emphasis on reliability and longevity.

The M74HC366 belongs to ST's high-speed CMOS logic family, engineered for drop-in compatibility with legacy 74-series designs while delivering lower power, wider voltage operation, and enhanced ESD robustness for modern embedded systems.

FAQ

What is the maximum clock frequency supported by M74HC366RM13TR?

The device has no internal clock; it is a combinational buffer. Its usable toggle rate depends on propagation delay and system timing margins. With tPD = 10 ns (typ.) and balanced tPLH/tPHL, it reliably supports bus toggling up to approximately 50 MHz in well-terminated, low-skew layouts - verified by AC specs at CL = 50 pF and fIN up to 1 MHz test conditions.

Can M74HC366RM13TR drive LED indicators directly?

No - its outputs are rated for ±6 mA continuous drive, insufficient for most visible LEDs (typically requiring 10–20 mA). Using it to sink/source LED current risks exceeding VOL/VOH limits and degrading noise margins. A dedicated LED driver or transistor stage is required for indicator applications.

Is the M74HC366RM13TR compatible with 3.3 V-only systems?

Yes - it operates down to VCC = 2 V and meets all DC/AC specifications at 3.3 V, including VIH = 2.31 V (min), VIL = 0.99 V (max), and IOL/IOH ≥ 6 mA. Input thresholds scale with VCC, ensuring reliable interfacing with 3.3 V microcontrollers without level shifters.

Does the part include Schmitt-trigger inputs?

No - the M74HC366RM13TR uses standard CMOS inputs without hysteresis. Its input threshold is approximately 50% VCC, and noise immunity is achieved via guaranteed VNIH/VNIL margins (≥28% VCC), not Schmitt-trigger action. For slow-rising or noisy signals, external RC filtering or a dedicated Schmitt buffer is recommended.