STMicroelectronics HCF4502BM1

Overview

HCF4502BM1 from STMicroelectronics is a strobed hex inverter/buffer IC with 3-state outputs, designed for bus-oriented digital logic interfacing in industrial control and instrumentation systems. It features six independent inverting buffers, common OUTPUT DISABLE (pin 4) and INHIBIT (pin 12) controls, TTL-load drive capability (2× standard TTL), and operates across 3–20 V supply range with quiescent current ≤120 µA at VDD = 15 V.

For engineers reviewing the HCF4502BM1 datasheet, HCF4502BM1 pinout, HCF4502BM1 application, or HCF4502BM1 equivalent, key selection criteria include 3-state bus contention management, wide-voltage rail compatibility (3–20 V), guaranteed noise margin (≥2.5 V at 15 V), propagation delay ≤80 ns at VDD = 15 V, and SOP-16 package suitability for space-constrained PCB layouts.

Technical Context

The HCF4502B implements CMOS B-series logic compliant with JEDEC JESD13B, using metal-oxide-semiconductor technology to achieve low static power and high noise immunity. Its dual control architecture-separate OUTPUT DISABLE (active-high, high-impedance override) and INHIBIT (active-high, forced-low override when disable is inactive)-enables precise bus arbitration and output state sequencing.

Each of the six channels provides true inversion with rail-to-rail output swing, capable of sinking up to 40.8 mA (VDD = 15 V) and sourcing –6.8 mA, meeting two-standard-TTL load requirements. Input leakage remains ≤0.1 µA at VDD = 18 V, supporting reliable operation in low-power monitoring circuits.

Key Specifications

Pinout & Package

SOP-16 (SO-16) surface-mount package per mechanical drawing PO13H: 9.8 × 5.8 mm body, 1.27 mm lead pitch, gull-wing leads, 1.75 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4050BE and 74HC240N, HCF4502BM1 uniquely combines wide-voltage operation (3–20 V), true 3-state control, and inverting logic in a single SOP-16 package - making it irreplaceable in legacy industrial bus designs requiring both voltage flexibility and deterministic bus release timing.

Availability

HCF4502BM1 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, and programmable logic controller backplanes requiring stable component supply and long-term obsolescence mitigation.

Supply support for HCF4502BM1 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 solutions with broad analog, digital, and mixed-signal product portfolios.

HCF4502B belongs to ST's legacy CMOS B-series logic family, engineered for industrial-grade reliability, wide supply tolerance, and interoperability with both TTL and CMOS systems in harsh-environment control applications.

FAQ

Is HCF4502BM1 pin-compatible with the DIP-packaged HCF4502BEY?

Yes - both variants share identical pin numbering and electrical functionality per JEDEC JESD13B. The SOP-16 (HCF4502BM1) and DIP-16 (HCF4502BEY) packages maintain full pin-for-pin correspondence, including VDD (16), VSS (8), OUTPUT DISABLE (4), INHIBIT (12), and all six input/output pairs. Mechanical layout differs, but PCB footprint adaptation is straightforward.

What is the maximum capacitive load the HCF4502BM1 can drive reliably?

HCF4502BM1 is characterized up to 50 pF load capacitance (CL = 50 pF) in dynamic testing, with propagation delays specified under that condition. While not explicitly rated beyond 50 pF, its 40.8 mA sink capability at VDD = 15 V supports heavier loads in DC-coupled applications; AC performance degrades above 50 pF due to increased transition times (tTHL/tTLH).

Can the INHIBIT and OUTPUT DISABLE inputs be tied together?

Yes - tying pins 4 and 12 together creates a combined active-high 3-state enable with forced-low priority. When driven high, outputs go high-impedance; when driven low, outputs reflect inverted inputs. This configuration simplifies control logic but eliminates independent inhibit functionality required for safe power-up sequencing in some systems.

Does HCF4502BM1 support 3.3 V logic interfacing?

No - while HCF4502BM1 operates down to 3 V supply, its input thresholds scale with VDD (e.g., VIH = 11 V at VDD = 15 V). At VDD = 3.3 V, VIH ≈ 2.3 V and VIL ≈ 0.9 V, making it incompatible with standard 3.3 V CMOS logic families that require VIH ≥ 2.0 V and VIL ≤ 0.8 V. Use only with 5 V or higher logic systems.