STMicroelectronics M74HC174RM13TR

Overview

M74HC174RM13TR from STMicroelectronics is a high-speed CMOS hex D-type flip-flop with asynchronous clear, operating across 2V–6V supply, delivering tPLH/tPHL ≈ 14–23 ns (VCC = 6V), fMAX = 66 MHz (typ.), and symmetrical 4 mA output drive. It serves as a synchronous data latch in digital control logic, clock-domain synchronization, and register file staging in industrial PLC I/O modules.

For engineers reviewing the M74HC174RM13TR datasheet, M74HC174RM13TR pinout, M74HC174RM13TR application, or M74HC174RM13TR equivalent, key selection criteria include asynchronous clear timing (tW(L) = 5 ns min), noise immunity (VNIH/VNIL = 28% VCC min), propagation delay balance, TSSOP-16 thermal profile, and compatibility with legacy 74-series logic interfaces.

Technical Context

The device implements six independent edge-triggered D flip-flops sharing a common clock and global active-low asynchronous clear. Each stage latches D-input data on the rising edge of CLOCK, with CLEAR overriding all outputs to logic low regardless of clock or data state.

Designed using silicon gate C2MOS technology, it features input protection diodes, symmetrical output impedance (|IOH| = IOL ≥ 4 mA), and balanced tPLH ≅ tPHL propagation delays-critical for skew-sensitive register chains and pipeline staging in deterministic control systems.

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9 mm × 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 D-type flip-flop with clear applications.

Compared with SN74HC174PWR and 74HC174D,653, the M74HC174RM13TR offers the lowest ICC (4 µA max) and widest temperature range (–55°C to +125°C), making it optimal for extended-life, thermally demanding embedded systems where leakage and drift must be minimized.

Availability

M74HC174RM13TR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment digital pattern generation, and medical infusion pump controllers requiring stable component supply across long production lifecycles.

Supply support for M74HC174RM13TR 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, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The M74HC174 belongs to ST's high-speed CMOS logic family, engineered for pin-compatible upgrades of legacy TTL and LS logic in noise-resilient, wide-voltage industrial control systems.

FAQ

Is M74HC174RM13TR compatible with 5 V TTL logic levels?

Yes - at VCC = 5 V, VIH = 3.15 V (min) and VIL = 1.35 V (max) meet TTL input thresholds, and VOH = 4.4 V (min at –4 mA) and VOL = 0.26 V (max at +4 mA) drive standard TTL loads directly without level shifters.

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

The AC specifications are characterized at CL = 50 pF. Driving >50 pF increases propagation delay and transition time; for 100 pF loads, tPLH/tPHL increase by ~15%, and fMAX drops to ~50 MHz - verify timing margins in target layout with IBIS simulation.

Does the CLEAR function override the clock edge behavior unconditionally?

Yes - CLEAR is asynchronous and active-low: when LOW, all Q outputs force to logic low immediately, regardless of CLOCK state, D input values, or internal flip-flop state; no clock edge is required for reset action.

Can M74HC174RM13TR operate at 2.0 V supply while maintaining full timing performance?

No - at VCC = 2.0 V, fMAX drops to 7.2 MHz (typ.) and tPLH/tPHL increase to 68 ns (max); propagation delay imbalance also rises. Use only for low-speed control logic (e.g., status latching), not high-frequency data capture.