STMicroelectronics HCF4056M013TR

Overview

HCF4056M013TR from STMicroelectronics is a BCD-to-7-segment decoder/driver IC with strobed latch and on-chip level-shifting capability, designed for driving LCD and LED displays. It supports VDD = 3–20 V, VEE = –5 V (min), delivers ±0.95 mA output drive at 15 V, and provides full decoding for digits 0–9 plus L, H, P, A, dash, and blank - all in a 16-pin SOP package.

For engineers reviewing the HCF4056M013TR datasheet, HCF4056M013TR pinout, HCF4056M013TR application, or HCF4056M013TR equivalent, key selection criteria include its dual-rail output swing (VDD to VEE), DF-controlled AC/DC segment drive mode, strobe-latched BCD inputs, and compatibility with low-leakage (≤100 nA) CMOS logic interfaces in battery-powered instrumentation.

Technical Context

The HCF4056M013TR implements a fully decoded BCD-to-7-segment mapping with dedicated strobe-latch control, enabling synchronous digit updates without ghosting. Its internal level-shifter decouples input logic swing (VSS to VDD) from output drive swing (VEE to VDD), allowing independent biasing - e.g., 0–5 V inputs with –5 V to 0 V segment outputs for LCDs.

Display Frequency (DF) input governs output polarity and waveform: static high/low for LED/segment DC drive, or 30–200 Hz square-wave inversion for LCD segments. The device requires external HCF4054B for common DF generation and operates across –55°C to +125°C with guaranteed quiescent current ≤3 µA at VDD = 5 V.

Key Specifications

Pinout & Package

Package: SO-16 (Small Outline, 16-pin, 3.9 mm width, 1.27 mm pitch, JEDEC MO-136 compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BCD-to-7-segment decoder/driver applications.

Compared with CD4511BE and MAX6954, the HCF4056M013TR uniquely combines strobe-latched parallel BCD input, on-die level shifting, and DF-synchronized AC drive - making it optimal for low-complexity, low-power, dual-rail display subsystems where microcontroller resources or external components must be minimized.

Availability

HCF4056M013TR is available at Aetrix Electronics and suitable for portable instrumentation, industrial panel meters, automotive dashboard clusters, and medical infusion pump displays requiring stable component supply and long-lifecycle support.

Supply support for HCF4056M013TR 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 products for industrial, automotive, and consumer markets.

The HCF4056 belongs to ST's legacy B-series CMOS logic family, engineered specifically for ultra-low-power, high-voltage-tolerant display interfacing in resource-constrained embedded systems - emphasizing reliability, wide temperature operation, and minimal external component count.

FAQ

Can HCF4056M013TR drive common-cathode LED displays directly?

Yes - when VEE is tied to VSS (ground), the 7-segment outputs become standard active-high drivers capable of sourcing up to 0.95 mA (at VDD = 15 V). For higher-current LEDs, external current-limiting resistors are required on each segment line to prevent exceeding absolute maximum ratings.

What is the purpose of the STROBE pin, and how must it be driven?

The STROBE pin is an active-high, edge-sensitive latch enable. BCD inputs are sampled only on the rising edge of STROBE; subsequent changes to inputs have no effect until the next strobe pulse. This prevents display corruption during asynchronous BCD updates and is essential for stable multiplexed digit rendering.

How does the DISPLAY-FREQUENCY (DF) input affect segment output behavior?

DF determines output polarity and waveform: logic low yields active-high segments; logic high yields active-low; a 30–200 Hz square wave produces phase-inverted AC output on selected segments (180° out-of-phase) and in-phase AC on unselected segments - enabling flicker-free LCD drive without external oscillators or capacitors.

Is HCF4056M013TR still in active production, and what is its obsolescence status?

While marked "Obsolete Product(s)" in ST's 2002 datasheet, HCF4056M013TR remains actively stocked and supported by Aetrix Electronics through authorized legacy distribution channels. Full traceability, extended lifecycle management, and last-time-buy planning are available for ongoing production programs.