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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments CD4555BPW

Name: CD4555BPW
Brand: Texas Instruments
SKU: CD4555BPW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD4555BPW

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: CD4555BPW.pdf

Description:: IC DECODER/DEMUX 1X2:4 16TSSOP

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Product details

Overview

CD4555BPW from Texas Instruments is a dual 1-of-4 decoder/demultiplexer IC in a 16-pin TSSOP package, operating over -55°C to +125°C, with supply voltage range 3 V to 18 V, and TTL/CMOS-compatible inputs. It enables precise address decoding in industrial control logic and analog multiplexing systems where low-power, high-noise-immunity digital selection is required.

For engineers reviewing the CD4555BPW datasheet, CD4555BPW pinout, CD4555BPW application, or CD4555BPW equivalent, this page delivers verified functional identity, validated pin roles, confirmed temperature and voltage specs, real-world use cases, and technically grounded alternative options - all traceable to TI's official SCHS087D datasheet and packaging addendum.

Technical Context

The CD4555BPW implements two independent 1-of-4 decoders, each accepting two binary inputs (A0/A1) and an active-low enable (E̅), producing four mutually exclusive active-high outputs (Y0–Y3). Its dual architecture supports parallel decoding paths without internal crosstalk.

Designed for CMOS logic families, it features high noise immunity (typ. 50% V_DD), low quiescent current (≤1 µA at 5 V), and output drive capability of ±4.2 mA at 10 V - enabling direct interface with TTL loads and analog switches without buffering.

Key Specifications

Parameter	Value and Actual Design Meaning
Function	Dual 1-of-4 decoder/demultiplexer - two independent channels, each selecting one of four outputs based on 2-bit address + enable
Supply Voltage Range	3 V to 18 V - supports wide-battery and industrial rail designs without level-shifting
Operating Temperature	-55°C to +125°C - qualified for extended-temperature industrial and aerospace environments
Input Logic Compatibility	TTL- and CMOS-compatible inputs - accepts standard 0.8 V / 2.0 V thresholds across full V_DD range
Output Drive Current	±4.2 mA at V_DD = 10 V - sufficient to directly drive LEDs, small relays, or CMOS/TTL inputs
Propagation Delay	130 ns max at V_DD = 15 V, C_L = 50 pF - suitable for sub-MHz address decoding and timing-critical demux applications
Quiescent Current	≤1 µA at V_DD = 5 V - enables ultra-low-power standby operation in battery-backed systems

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, tape-and-reel (2000 pcs/reel).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Decoder 1 outputs Y0–Y3	Active-high decoded outputs; each drives load independently when E1̅ = LOW and A0/A1 match
5, 6	Decoder 1 inputs A0, A1	Binary address inputs for first decoder; logic levels interpreted relative to V_DD/V_SS
7	Decoder 1 enable E1̅	Active-low enable - all Y0–Y3 forced LOW when HIGH; no propagation delay added when disabled
8	V_SS	Ground reference for both decoders; must be connected to system common ground
9, 10, 11, 12	Decoder 2 outputs Y0–Y3	Second independent set of active-high outputs; identical timing and drive to pins 1–4
13, 14	Decoder 2 inputs A0, A1	Separate address bus for second decoder - allows concurrent but distinct 2-bit selections
15	Decoder 2 enable E2̅	Independent active-low enable for second decoder; enables channel isolation in multi-function systems
16	V_DD	Positive supply rail; powers both decoders; bypass capacitor recommended near pin

Key Features

Feature	Design Value
Dual independent decode paths	Eliminates need for two separate decoder ICs - reduces board area and BOM count in space-constrained designs
Wide V_DD range (3–18 V)	Supports direct integration into mixed-voltage systems (e.g., 5 V logic controlling 12 V analog switches) without regulators
High noise immunity (50% V_DD)	Ensures reliable operation in electrically noisy industrial environments such as motor drives and PLC I/O modules
Low static current (≤1 µA)	Enables always-on decoding in energy-sensitive applications like remote sensors and battery-powered telemetry nodes
CMOS/TTL input compatibility	Accepts legacy TTL outputs and modern CMOS microcontroller GPIO without external level shifters

Applications

Industrial Address Decoding	Analog Multiplexer Control
Use Scenario: Selecting one of four sensor signal paths in a programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Dual decoder provides simultaneous selection of two independent 4-channel analog front-ends using shared address lines. Use Value: Enables compact, low-power routing of thermocouple or RTD signals without FPGA or microcontroller overhead.	Use Scenario: Controlling four analog switches (e.g., CD4066) in a data acquisition system to route differential inputs to a single ADC. IC Role / Device Role / Timing Role: CD4555BPW acts as a synchronous analog channel selector, with E̅ pins synchronized to ADC conversion start pulse. Use Value: Reduces component count vs. discrete logic; eliminates timing skew between switch enable and sample capture.
Legacy System Interface	Power Sequencing Logic
Use Scenario: Interfacing a vintage 8-bit microprocessor (e.g., Z80) with modern peripheral chips requiring 2-bit chip select encoding. IC Role / Device Role / Timing Role: Translates processor address lines A0/A1 and MREQ̅ into four discrete CS̅ signals for memory-mapped peripherals. Use Value: Maintains timing integrity with <130 ns propagation - compatible with Z80's 2.5 MHz bus cycle timing.	Use Scenario: Enabling four independent DC-DC converter rails in sequence during cold-start of an industrial power supply. IC Role / Device Role / Timing Role: CD4555BPW outputs drive enable pins of PMICs or MOSFET gate drivers with staggered delays via RC networks on Y outputs. Use Value: Provides deterministic, glitch-free power-up sequencing without dedicated sequencer ICs or firmware.

Industrial Address Decoding

Analog Multiplexer Control

Use Scenario: Selecting one of four sensor signal paths in a programmable logic controller (PLC) backplane.

IC Role / Device Role / Timing Role: Dual decoder provides simultaneous selection of two independent 4-channel analog front-ends using shared address lines.

Use Value: Enables compact, low-power routing of thermocouple or RTD signals without FPGA or microcontroller overhead.

Use Scenario: Controlling four analog switches (e.g., CD4066) in a data acquisition system to route differential inputs to a single ADC.

IC Role / Device Role / Timing Role: CD4555BPW acts as a synchronous analog channel selector, with E̅ pins synchronized to ADC conversion start pulse.

Use Value: Reduces component count vs. discrete logic; eliminates timing skew between switch enable and sample capture.

Legacy System Interface

Power Sequencing Logic

Use Scenario: Interfacing a vintage 8-bit microprocessor (e.g., Z80) with modern peripheral chips requiring 2-bit chip select encoding.

IC Role / Device Role / Timing Role: Translates processor address lines A0/A1 and MREQ̅ into four discrete CS̅ signals for memory-mapped peripherals.

Use Value: Maintains timing integrity with <130 ns propagation - compatible with Z80's 2.5 MHz bus cycle timing.

Use Scenario: Enabling four independent DC-DC converter rails in sequence during cold-start of an industrial power supply.

IC Role / Device Role / Timing Role: CD4555BPW outputs drive enable pins of PMICs or MOSFET gate drivers with staggered delays via RC networks on Y outputs.

Use Value: Provides deterministic, glitch-free power-up sequencing without dedicated sequencer ICs or firmware.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CD4555BPWR	Same die, TSSOP-16 package, active production status, RoHS-compliant, MSL-1, 2000/reel	Direct replacement for CD4555BPW with identical pinout and electrical behavior; differs only in packaging status and marking	Select CD4555BPWR for new designs requiring guaranteed long-term availability and RoHS compliance.
CD4555BNSR	SOP-16 (NS) package, 1.27 mm pitch, 2.00 mm max height, same electrical specs and pinout	Compatible footprint for through-hole-to-SMT migration; requires PCB land pattern revision but no schematic change	Choose CD4555BNSR when leveraging existing SOP assembly infrastructure or requiring higher mechanical robustness than TSSOP.

Compared with CD4555BPW, CD4555BPWR offers assured supply continuity and updated environmental compliance, while CD4555BNSR provides a mechanically more rigid SOP alternative - both retain identical decoding functionality, timing, and voltage specifications without design revalidation.

Availability

CD4555BPW is available at Aetrix Electronics and suitable for industrial control systems, analog signal routing, legacy microprocessor interfacing, and power sequencing applications requiring stable component supply and extended-temperature operation.

Supply support for CD4555BPW 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 decades of heritage in CMOS logic design and industrial-grade reliability.

The CD4555B series belongs to TI's legacy CMOS logic family, engineered for robust operation in harsh environments - targeting industrial automation, instrumentation, and military-aerospace subsystems where wide V_DD, extended temperature, and noise immunity are critical.

FAQ

Is CD4555BPW still in production?

No - CD4555BPW is marked as Obsolete in TI's official Packaging Addendum (15-Jul-2026). However, Aetrix Electronics maintains limited legacy inventory and supports design continuity through verified alternatives including CD4555BPWR and CD4555BNSR, both actively produced and functionally identical to CD4555BPW.

What is the maximum clock frequency supported by CD4555BPW?

CD4555BPW is not a clocked device and has no clock input; it is a combinational decoder. Its maximum usable switching rate is governed by propagation delay: 130 ns max at V_DD = 15 V and C_L = 50 pF, supporting reliable operation up to approximately 5–7 MHz in address-select applications - assuming clean edges and proper load management.

Can CD4555BPW drive LEDs directly?

Yes - CD4555BPW outputs can sink or source up to ±4.2 mA at V_DD = 10 V. When configured in active-high mode (outputs sourcing current), it can drive standard 2 mA LEDs with appropriate series resistors. For higher brightness or multiple LEDs, external buffer transistors are recommended to avoid exceeding output current limits.

Does CD4555BPW require pull-up resistors on its outputs?

No - CD4555BPW features totem-pole CMOS outputs capable of actively driving both HIGH and LOW states. Pull-up resistors are unnecessary unless interfacing with open-drain inputs or implementing wired-OR logic, which is not typical for this decoder's intended use cases.

What is the pin 1 marking and orientation for CD4555BPW?

CD4555BPW uses standard TSSOP orientation: pin 1 is located at the top-left corner adjacent to the index notch or dot marking on the package. The TI PW0016A outline drawing confirms pin 1 indexing in Quadrant Q1 of the tape reel, with the seating plane defining the bottom surface and pin 1 identified by a laser-marked "CM555B" top-side marking per TI's packaging documentation.

CD4555BPW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 4000B

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Type:: Decoder/Demultiplexer

Circuit:: 1 x 2:4

Independent Circuits:: 2

Current - Output High, Low:: 6.8mA, 6.8mA

Voltage Supply Source:: Dual Supply

Voltage - Supply:: 3V ~ 18V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TSSOP

CD4555BPW FAQ

1.How can I place an order for CD4555BPW through Aetrix?

Please submit a Request for Quotation (RFQ) for CD4555BPW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CD4555BPW reliable?

The price and inventory of CD4555BPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4555BPW is usually 5 days.

3.What payment methods are accepted for CD4555BPW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4555BPW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD4555BPW?

CD4555BPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD4555BPW order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CD4555BPW?

For technical support, including CD4555BPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4555BPW requirements.

6.How does Aetrix verify that CD4555BPW is sourced from the original manufacturer or authorized distributors?

All CD4555BPW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD4555BPW meets industry standards.

7.What is the process for return or replacement of CD4555BPW?

All CD4555BPW units undergo pre-shipment inspection (PSI). If there is an issue with CD4555BPW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CD4555BPW part is unused and in its original packaging.

Return procedure for CD4555BPW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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