STMicroelectronics M74HC40103RM13TR

Overview

M74HC40103RM13TR from STMicroelectronics is a high-speed CMOS 8-stage presettable synchronous down counter with active-low control inputs, 2V–6V operation, 38MHz max clock frequency (typ. at VCC=6V), 4µA max quiescent current at 25°C, and single active-low ZERO-DETECT/CO output. It serves as a programmable divide-by-N timing element in digital control logic, industrial timers, and frequency division circuits.

For engineers reviewing the M74HC40103RM13TR datasheet, M74HC40103RM13TR pinout, M74HC40103RM13TR application, or M74HC40103RM13TR equivalent, key selection criteria include synchronous/asynchronous preset capability, zero-detect timing accuracy, cascading support via CI/CE and CO/ZD, and TSSOP-16 compatibility for space-constrained PCB layouts.

Technical Context

The M74HC40103 implements an 8-bit binary synchronous down counter with priority-encoded control: asynchronous CLEAR sets count to 255, APE forces parallel load regardless of clock, SPE enables clock-synchronized load, and CI/CE gates counting. All control inputs and CO/ZD are active low.

It supports both ripple and synchronous cascading using CI/CE (input enable) and CO/ZD (zero detect), with propagation delays tightly balanced (tPLH ≅ tPHL) and noise immunity ≥28% VCC. The device uses silicon gate C2MOS technology for low power and rail-to-rail output swing.

Key Specifications

Pinout & Package

TSSOP-16 package (4.9 × 6.4 mm body, 0.65 mm pitch), lead-free and RoHS-compliant, optimized for automated SMT assembly and thermal performance in dense digital logic layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit synchronous down counter applications.

Compared with SN74HC40103DR and CD74HC40103M96, the M74HC40103RM13TR offers superior thermal performance in TSSOP-16, tighter propagation delay consistency across temperature, and guaranteed 4 µA ICC(max) at 25°C - making it optimal for precision timing in compact industrial controllers.

Availability

M74HC40103RM13TR is available at Aetrix Electronics and suitable for programmable timers, frequency dividers, industrial counters, and synchronous cascade systems requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for M74HC40103RM13TR 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, specializing in automotive, industrial, and power management ICs with strong analog and digital portfolio depth.

The M74HC40103 belongs to ST's legacy high-speed CMOS logic family, designed specifically for robust, low-power digital timing and counting functions in harsh industrial and automation environments.

FAQ

What is the function of the CO/ZD pin?

The CO/ZD pin is a dual-function active-low output that asserts for exactly one full clock period when the internal 8-bit count reaches zero - provided CI/CE is low. It serves as both a carry-out signal for cascading and a zero-detect flag for reload or interrupt generation, with propagation delay specified at 20 ns (typ., VCC = 6V).

Can the M74HC40103RM13TR operate at 3.3V?

Yes - the device is fully specified for VCC = 2V to 6V, including 3.3V operation. At 3.3V, it delivers 20 MHz max clock frequency (min), VIH = 2.31V (min), VIL = 1.09V (max), and IOH/IOL ≥ 4mA, ensuring reliable interfacing with 3.3V FPGA I/O banks and microcontroller GPIOs.

How does asynchronous preset differ from synchronous preset?

Asynchronous preset (APE low) loads J0–J7 immediately, overriding clock and CI/CE state; synchronous preset (SPE low) loads J0–J7 only on the next rising clock edge. APE enables instant reconfiguration (e.g., emergency reset), while SPE ensures deterministic, edge-aligned updates aligned with system timing domains.

Is the TSSOP-16 package RoHS-compliant and lead-free?

Yes - the M74HC40103RM13TR uses a RoHS-compliant, lead-free TSSOP-16 package (mechanical code: TSSOP16) with matte tin finish, qualified per JEDEC J-STD-020 moisture sensitivity level 1 (MSL1), and compatible with standard Pb-free reflow profiles (peak 260°C).