STMicroelectronics M74HC155RM13TR

Overview

M74HC155RM13TR from STMicroelectronics is a high-speed CMOS dual 2-to-4 line decoder/demultiplexer with independent strobe (1G/2G) and data inputs (1C/2C), common address lines (A/B), and 8 outputs (1Y0–1Y3, 2Y0–2Y3). It operates from 2V to 6V, delivers 13ns typical propagation delay at 6V, supports symmetrical ±4mA drive, and features high noise immunity (28% VCC min). It enables flexible 1-to-8 demux or 3-to-8 decoding in industrial control logic.

For engineers reviewing the M74HC155RM13TR datasheet, M74HC155RM13TR pinout, M74HC155RM13TR application, or M74HC155RM13TR equivalent, key selection criteria include VCC range compatibility (2–6V), dual independent enable architecture, output drive strength (±4mA), propagation delay symmetry (tPLH ≅ tPHL), and TSSOP-16 thermal performance for space-constrained PCB layouts.

Technical Context

The M74HC155RM13TR implements two independent 2-to-4 decoders sharing binary address inputs A and B, each with dedicated strobe (1G/2G) and data (1C/2C) controls. Its logic behavior is defined by truth tables where low strobe disables all outputs (high-impedance), and active strobes route inverted 1C or non-inverted 2C to selected Y outputs based on A/B state.

It uses silicon gate C2MOS technology for low static power (ICC ≤ 4µA at 25°C) and robust ESD protection on all inputs. Propagation delays are balanced (tPLH ≅ tPHL), and output impedance is symmetrical-enabling clean signal routing in mixed-signal timing paths without skew-induced glitches.

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, thin-profile surface-mount with exposed pad not present. RoHS-compliant, moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 2-to-4 decoder applications.

Compared with SN74HC155DR and 74AHC155PW, the M74HC155RM13TR offers optimal balance of wide VCC range (2–6V), industrial temperature support (−55°C to +125°C), and TSSOP-16 footprint efficiency-making it preferred for new designs targeting compact, ruggedized embedded control.

Availability

M74HC155RM13TR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment signal routing, and medical infusion pump logic requiring stable component supply across extended temperature and voltage ranges.

Supply support for M74HC155RM13TR 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, power ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The M74HC155 belongs to ST's high-speed CMOS logic family, engineered for low-power, noise-immune digital interfacing in harsh environments-targeting applications where reliability, wide supply range, and predictable timing are critical.

FAQ

Can M74HC155RM13TR operate at 3.3V with guaranteed timing?

Yes. Per AC Electrical Characteristics, tPD is specified at 4.5V (26ns max) and 2.0V (130ns max); at 3.3V, typical tPD is ~18ns with full functionality across −40°C to +85°C. The device meets all DC and AC specs within its 2–6V VCC range, including 3.3V nominal systems.

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

The M74HC155RM13TR is characterized with CL = 50pF in AC testing. Its ±4mA output drive supports loads up to 100pF while maintaining tPD < 33ns at 6V. For heavier loads, add series termination or buffer stages to avoid excessive rise/fall time degradation.

How does the strobe logic interact with the data inputs during partial enable?

When 1G is low and 2G is high, only Section 1 (1Y0–1Y3) responds to A/B and 1C; Section 2 outputs remain high-impedance. This allows independent gating of each decoder section-enabling time-sliced resource allocation in shared-bus architectures without external logic.

Is there an exposed thermal pad on the TSSOP-16 package?

No. The M74HC155RM13TR in TSSOP-16 (package code RM13TR) has no exposed thermal pad. Thermal dissipation relies on copper pour under pins and standard PCB trace conduction. θ_JA is 180°C/W per JEDEC JESD51-7, requiring ≥2 cm² of 1-oz copper for continuous 125°C ambient operation.