Texas Instruments CD4555BPWR

Overview

CD4555BPWR from Texas Instruments is a dual 1-of-4 decoder/demultiplexer IC in a 16-pin TSSOP package, operating across –55°C to +125°C, with supply voltage range 3 V to 18 V, and TTL/CMOS-compatible inputs. It enables address decoding in industrial control logic and low-power instrumentation multiplexing.

For engineers reviewing the CD4555BPWR datasheet, CD4555BPWR pinout, CD4555BPWR application, or CD4555BPWR equivalent, this device serves as a precision binary-to-1-of-4 active-low output decoder with independent enable control per section-critical for memory addressing, I/O expansion, and discrete logic state selection in space-constrained embedded systems.

Technical Context

The CD4555BPWR implements two independent 2-to-4 line decoders, each with separate active-high enable (E1, E2) and active-low outputs (Y0–Y3). Each decoder accepts two binary inputs (A0, A1) and drives four mutually exclusive low-asserted outputs based on input state and enable status.

It uses standard CMOS silicon-gate technology, delivering high noise immunity (typ. 50% V_DD), low static current (<100 nA at 18 V), and propagation delays of 120 ns max at 5 V and 60 ns max at 15 V-enabling reliable operation in mixed-voltage legacy and modern industrial logic systems.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar decoder/demultiplexer applications.

Compared with CD4555BE and CD4555BM96, the CD4555BPWR offers the smallest PCB footprint (4.4 mm × 5.0 mm) and highest density integration for space-critical industrial modules, while retaining identical timing, voltage, and logic behavior across all three variants.

Availability

CD4555BPWR is available at Aetrix Electronics and suitable for industrial PLCs, legacy system upgrades, and low-power sensor nodes requiring stable component supply over extended product lifecycles.

Supply support for CD4555BPWR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of industrial-grade component heritage.

The CD4555B family belongs to TI's legacy CMOS logic portfolio, designed specifically for high-reliability, wide-temperature industrial control, instrumentation, and aerospace subsystems where long-term supply stability and radiation-tolerant design are essential.

FAQ

What is the maximum clock frequency supported by CD4555BPWR?

The CD4555BPWR is not a clocked sequential device-it is a combinational decoder with no internal clock. Its usable switching rate is governed by propagation delay: at V_DD = 15 V, t_PD ≤ 60 ns, supporting reliable operation with input transitions up to ~8 MHz under controlled edge rates. The CD4555BPWR does not specify or require a clock signal.

Does CD4555BPWR support 3.3 V logic levels?

Yes, CD4555BPWR operates down to 3 V supply and meets its full specification-including input thresholds (V_IL ≤ 0.9 V, V_IH ≥ 2.1 V at V_DD = 3 V) and output drive-making it compatible with 3.3 V microcontrollers and FPGAs without level shifters.

Is CD4555BPWR pin-compatible with CD4555BE?

No-CD4555BPWR uses a 16-pin TSSOP (PW) package with 0.65 mm pitch and gull-wing leads, while CD4555BE uses a 16-pin PDIP (N) package with 2.54 mm pitch and through-hole leads. They share identical pin numbering and logic function but require different PCB footprints and assembly processes.

What is the meaning of "PWR" in CD4555BPWR?

The "PWR" suffix denotes Texas Instruments' thin shrink small-outline package (TSSOP) variant with RoHS-compliant NIPDAU lead finish, MSL Level-1 rating, and tape-and-reel packaging (2000 units per reel). It is distinct from the "PW" variant, which is obsolete and non-RoHS.

Can CD4555BPWR replace CD4556B in a design?

No-CD4555BPWR is a dual 1-of-4 decoder with active-low outputs, whereas CD4556B is a dual 1-of-4 decoder with active-high outputs. Swapping them would invert all output logic states, causing functional failure unless external inversion is added. The CD4555BPWR and CD4556B are not functionally interchangeable.