Texas Instruments CD4556BM96

Overview

CD4556BM96 from Texas Instruments is a dual 1-of-4 decoder/demultiplexer IC in a 16-pin SOIC package, operating across -55°C to +125°C, with supply voltage range 3 V to 18 V, and typical propagation delay of 120 ns at 5 V. It functions as a logic-level address decoder in industrial control panels requiring discrete output selection.

For engineers reviewing the CD4556BM96 datasheet, CD4556BM96 pinout, CD4556BM96 application, or CD4556BM96 equivalent, this page delivers verified package mapping, validated pin functions, confirmed timing specs, and two field-tested alternative parts for legacy system redesigns and long-life industrial deployments.

Technical Context

The CD4556BM96 implements two independent 1-of-4 decoders, each accepting two binary inputs (A0/A1) and enabling active-high outputs (Y0–Y3) when the associated enable input (E1 or E2) is high. Both sections share no internal signal coupling and operate with CMOS-level noise immunity.

It uses standard CD4000-series silicon-gate CMOS technology, delivering rail-to-rail output swing, static operation down to 0 Hz, and inherent latch-up immunity. Input thresholds are referenced to V_DD/2, ensuring stable switching across its full 3–18 V supply range.

Key Specifications

Pinout & Package

CD4556BM96 is housed in a 16-pin Small Outline Integrated Circuit (SOIC-D) package measuring 10.4 mm × 5.3 mm × 1.75 mm (max height), with 1.27 mm lead pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4555BM96 and 74HC139DR, the CD4556BM96 uniquely combines dual-decoder integration, 3–18 V operation, and -55°C to +125°C qualification - making it irreplaceable in high-reliability, multi-rail industrial systems where voltage flexibility and thermal resilience are non-negotiable.

Availability

CD4556BM96 is available at Aetrix Electronics and suitable for industrial PLCs, avionics annunciator panels, and downhole telemetry modules requiring stable component supply across 15+ year product lifecycles.

Supply support for CD4556BM96 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 founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and aerospace markets.

The CD4556B series belongs to TI's legacy CD4000B CMOS logic family, designed specifically for high-noise, wide-temperature, and mixed-voltage industrial control systems where robustness outweighs raw speed.

FAQ

What is the maximum clock frequency supported by CD4556BM96?

The CD4556BM96 is a static decoder with no internal clock - it responds asynchronously to input changes. Its usable upper limit is determined by propagation delay: at 5 V, t_PD ≤ 120 ns supports reliable operation up to approximately 4 MHz in address decode applications. The CD4556BM96 does not require a clock signal and remains stable at DC.

Can CD4556BM96 drive LEDs directly without current-limiting resistors?

No - while the CD4556BM96 can source/sink ±4.2 mA at 15 V, driving an LED directly risks exceeding absolute maximum output current ratings and causing premature wear. A series resistor (e.g., 1 kΩ for 5 V supply) is required to limit current to ≤ 3 mA per output. The CD4556BM96 output stage is not designed for continuous LED sink/source duty.

Is CD4556BM96 pin-compatible with CD4555B-based designs?

No - CD4556BM96 contains two independent decoders (8 outputs), whereas CD4555B has one decoder (4 outputs). Their pinouts differ: CD4555B uses Pins 1–4 for inputs/enable and 5–8 for outputs; CD4556BM96 allocates Pins 1–2,5 for Section 1 control and 3–4,7–10 for its outputs. Direct replacement requires PCB redesign. The CD4556BM96 is not a drop-in substitute for CD4555B.

Does CD4556BM96 support 3.3 V logic systems?

Yes - the CD4556BM96 operates down to 3 V with guaranteed functionality. At 3.3 V, propagation delay increases to ~220 ns and output drive drops to ±1.8 mA, but all logic thresholds and DC parameters remain valid per SCHS087D. System designers must verify timing margins in 3.3 V CD4556BM96 implementations.

What is the meaning of "M96" in CD4556BM96?

The "M96" suffix denotes Texas Instruments' standard tape-and-reel packaging for SOIC-16 devices: 2500 units per large reel, NIPDAU lead finish, RoHS compliant, and MSL Level-1 rating. It does not indicate a functional variant - CD4556BM96 shares identical electrical specifications with CD4556BE (PDIP) and CD4556BF3A (ceramic DIP). The CD4556BM96 is the preferred SMT version for automated assembly.