Nexperia USA Inc. HEF4555BT,653

Overview

HEF4555BT,653 from Nexperia is a dual 1-of-4 CMOS decoder/demultiplexer in SO16 package, featuring two independent channels each with two address inputs (nA0/nA1), active-LOW enable (nE), and four active-HIGH mutually exclusive outputs (nY0–nY3). It operates across 3 V to 15 V supply range, supports -40 °C to +85 °C ambient, and delivers propagation delays as low as 22 ns at 15 V with 50 pF load - used for address decoding in microcontroller peripheral expansion and digital logic routing.

For engineers reviewing the HEF4555BT,653 datasheet, HEF4555BT,653 pinout, HEF4555BT,653 application, or HEF4555BT,653 equivalent, this device is selected for dual-channel logic decoding where wide-voltage compatibility, static operation, and high noise immunity are required in industrial control panels and legacy TTL/CMOS hybrid systems.

Technical Context

The HEF4555BT,653 implements two identical, fully static CMOS decoder/demultiplexer cells sharing no internal resources. Each cell decodes binary address inputs (nA0, nA1) to assert exactly one of four outputs when enabled (nE = LOW); as a demultiplexer, nE serves as data input while nA0/nA1 select the output path.

Its logic behavior is defined by truth table with strict mutual exclusivity: only one output goes HIGH per active channel; all others remain LOW. Input thresholds scale with VDD (VIH ≥ 0.7×VDD, VIL ≤ 0.3×VDD), and output drive capability is symmetric (|IOH|/|IOL| up to 3.6 mA at 15 V), enabling direct interface with TTL and CMOS loads.

Key Specifications

Pinout & Package

HEF4555BT,653 is housed in a plastic small outline package (SO16), SOT109-1 variant, with 16 leads, 3.9 mm body width, and standard 1.27 mm lead pitch - compatible with automated PCB assembly and IPC-7351B land patterns.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-of-4 decoder/demultiplexer applications.

Compared with CD4555BE and 74HC154D, the HEF4555BT,653 uniquely combines dual-channel integration, SO16 surface-mount compatibility, sub-30 ns propagation at 15 V, and active-HIGH outputs - making it optimal for compact industrial controllers requiring two independent 4-way decode paths without logic inversion.

Availability

HEF4555BT,653 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy microcontroller address decoding, digital panel display multiplexing, and test equipment signal routing requiring stable component supply across extended temperature and voltage ranges.

Supply support for HEF4555BT,653 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

Nexperia is a global semiconductor expert specializing in high-performance, energy-efficient logic, analog, and discrete components - founded in 2017 as a spin-off from NXP Semiconductors.

The HEF4555B belongs to Nexperia's legacy-compatible CMOS logic family, designed specifically for industrial and automotive-adjacent applications requiring wide supply tolerance, high ESD resilience, and long-term product stability.

FAQ

Can HEF4555BT,653 operate reliably at 3.3 V?

Yes - the device is specified down to 3 V minimum supply voltage, with guaranteed VIH ≥ 2.31 V and VIL ≤ 0.99 V at VDD = 3.3 V. Static operation and functional correctness are maintained, though propagation delay increases to ~230 ns (typ) and output drive drops to ±0.36 mA. No level-shifting is required for interfacing with 3.3 V microcontrollers.

What happens if an enable input (nE) is left floating?

An unconnected nE pin will float toward VDD due to internal protection diodes and CMOS gate leakage, causing the associated decoder channel to remain disabled (all outputs LOW). This violates the datasheet requirement that unused inputs be tied to VDD, VSS, or another input - risking erratic behavior under EMI or thermal drift. Always pull nE to VSS via 10 kΩ resistor if unused.

Is HEF4555BT,653 pin-compatible with older HEF4555BP (DIP-16)?

No - the HEF4555BP uses SOT38-4 (16-pin DIP) with identical pin numbering but different mechanical footprint and thermal characteristics. While logic function and pin assignments match (1E, 1A0, 1A1, 1Y0–1Y3, VSS, VDD, 2Y0–2Y3, 2A1, 2A0, 2E), the SO16 package requires revised PCB layout, stencil design, and reflow profile. Electrical performance is otherwise identical.

How does dynamic power dissipation scale with load capacitance?

Dynamic power (PD) follows PD = K × fi + Σ(fo × CL) × VDD², where K is 4500 (5 V), 18800 (10 V), or 45700 (15 V) in μW/MHz. For example, at 15 V with 1 MHz input, 50 pF load, and one output switching: PD ≈ 45700 + (1 × 50) × 225 = 45700 + 11250 = 56.95 mW. Total power remains well below the 500 mW SO16 limit even with multiple outputs toggling.