STMicroelectronics HCF4028M013TR

Overview

HCF4028M013TR from STMicroelectronics is a BCD-to-decimal or binary-to-octal decoder IC with 4-bit BCD input (A–D), 10 buffered high-drive outputs (0–9), and dual-mode decoding logic. It operates from 3 V to 20 V, delivers 3.0 mA sink current at VDD = 15 V, and achieves 60 ns typical propagation delay (tPLH) at 15 V - enabling direct drive of Nixie tubes and high-fan-out logic in legacy instrumentation.

For engineers reviewing the HCF4028M013TR datasheet, HCF4028M013TR pinout, HCF4028M013TR application, or HCF4028M013TR equivalent, key selection criteria include its positive-logic decoded outputs (active-high), symmetrical output characteristics, ±100 nA input leakage at 18 V, JEDEC JESD13B compliance, and SOP-16 packaging for space-constrained through-hole replacement designs.

Technical Context

The HCF4028M013TR implements combinational decoding using buffered CMOS inputs feeding NAND/NOR-based logic gates, with all 10 outputs individually buffered for enhanced drive strength and fan-out capability. Its dual-mode operation supports both 4-bit BCD-to-decimal (D = L selects 0–9) and 3-bit binary-to-octal (D = L, A–C only) decoding paths without external logic.

It features standardized symmetrical VOH/VOL (e.g., VOH ≥ 14.95 V at VDD = 15 V, VOL ≤ 0.05 V), guaranteed noise margins (≥2.5 V at 15 V), and full DC/AC characterization across –55°C to +125°C, meeting industrial and legacy aerospace timing-critical decode requirements where latch-free, static logic behavior is mandatory.

Key Specifications

Pinout & Package

SOP-16 package (SO-16, body width 3.9 mm, pitch 1.27 mm), compliant with mechanical data PO13H, with gull-wing leads and moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BCD-to-decimal decoder applications.

Compared with CD4028BE and MC14028BDR2G, the HCF4028M013TR offers SOP-16 compatibility for modern SMT lines, JEDEC JESD13B certification for assured B-series interoperability, and optimized 60 ns propagation at 15 V - making it the preferred choice for new designs targeting Nixie displays and industrial BCD interfaces.

Availability

HCF4028M013TR is available at Aetrix Electronics and suitable for Nixie tube display systems, legacy industrial panel decoders, multi-format code converters, and avionics annunciator interfaces requiring stable component supply and long-term obsolescence management.

Supply support for HCF4028M013TR 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 microcontrollers, power management ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The HCF4028B series belongs to ST's legacy CMOS logic portfolio, engineered specifically for drop-in replacement of 4000-series BCD decoders in high-reliability, wide-supply-voltage applications where robustness and long-term availability outweigh speed optimization.

FAQ

What is the maximum supply voltage for HCF4028M013TR?

The absolute maximum supply voltage (VDD) is +22 V, but the recommended operating range is 3 V to 20 V. Operation above 20 V risks exceeding internal oxide breakdown limits and is not characterized per datasheet. At 20 V, quiescent current remains below 3 mA, and output drive capability is fully specified up to that limit.

Does HCF4028M013TR support octal decoding without external components?

Yes - when input D is held LOW, the device decodes only inputs A–C as a 3-bit binary code, activating outputs 0–7. No external logic or pull-down resistors are needed; D is internally referenced and functions as a dedicated mode select pin per the truth table and functional diagram.

Can HCF4028M013TR directly drive common-anode Nixie tubes?

No - it provides active-high outputs, while common-anode Nixie tubes require active-low (cathode-switching) drive. However, it can directly drive common-cathode Nixie tubes (e.g., IN-12A) by connecting each output to a cathode via current-limiting resistor, leveraging its 6.8 mA sink capability at 15 V.

Is HCF4028M013TR still in active production?

No - STMicroelectronics has marked HCF4028B variants, including HCF4028M013TR, as Obsolete Product(s). Aetrix Electronics maintains legacy inventory with full traceability and offers lifecycle coordination support, including cross-reference guidance and last-time-buy planning for ongoing production programs.