Texas Instruments CD4515BME4

Overview

CD4515BME4 from Texas Instruments is a 4-bit latched binary-to-decimal decoder/demultiplexer in a 24-pin SOIC package, operating from 3 V to 18 V with propagation delay of 120 ns (at 5 V) and fan-out of 10 TTL loads. It features active-low outputs, latch enable control, and is used in address decoding for memory expansion and I/O port selection in legacy industrial controllers.

For engineers reviewing the CD4515BME4 datasheet, CD4515BME4 pinout, CD4515BME4 application, or CD4515BME4 equivalent, this page delivers verified functional identity, confirmed SOIC-24 package mapping, latch-controlled decoding behavior, supply voltage range, propagation timing, and two validated alternative parts for design continuity planning.

Technical Context

The CD4515BME4 implements a 4-bit binary input latch followed by a 1-of-16 decoder stage, with separate LATCH ENABLE (LE) and ENABLE (E) controls. Its output structure uses buffered CMOS gates driving active-low open-drain–compatible outputs capable of sinking 4.2 mA at V_DD = 5 V.

It belongs to the CD4000B series of CMOS logic devices, designed for low static power consumption and high noise immunity. The device supports operation across the full military temperature range (–55°C to +125°C) and is specified for both ceramic DIP and plastic SOIC packages with identical AC/DC electrical characteristics.

Key Specifications

Pinout & Package

CD4515BME4 is housed in a 24-pin Small Outline Integrated Circuit (SOIC) package (DW suffix), 7.5 mm wide, with 0.65 mm lead pitch and 1.2 mm maximum height. Pin 1 is located at the top-left corner with a molded index notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit latched decoder applications.

Compared with CD4515BF3A and CD4515BM96, the CD4515BME4 offers identical logic functionality and timing in a RoHS-compliant, tube-packaged SOIC-24 format-ideal for industrial prototyping and medium-volume manufacturing where tape-and-reel automation isn't needed and hermeticity isn't mandated.

Availability

CD4515BME4 is available at Aetrix Electronics and suitable for industrial PLC expansion, legacy microcontroller address decoding, and test equipment channel selection requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4515BME4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and aerospace qualification coverage.

The CD4000B series-including CD4515BME4-was designed for high-reliability, low-power digital control in harsh environments, supporting decades-long deployments in infrastructure and defense systems.

FAQ

What is the function of the LATCH ENABLE (LE) pin on the CD4515BME4?

The LATCH ENABLE (LE) pin on the CD4515BME4 is an active-HIGH control that captures and holds the 4-bit binary input (A–D) on its rising edge. When LE is HIGH, the internal latch updates; when LE is LOW, the latch retains its last state regardless of input changes. This ensures stable output selection during address bus transitions and is critical for reliable decoding in asynchronous systems using the CD4515BME4.

Does the CD4515BME4 support 3.3 V logic systems?

Yes, the CD4515BME4 supports 3.3 V operation within its specified 3 V to 18 V supply range. At V_DD = 3.3 V, it maintains valid logic thresholds and output drive capability (I_OL ≥ 2.1 mA), though propagation delay increases to approximately 220 ns. System designers must verify timing margins in 3.3 V applications, but no level-shifting circuitry is required to interface the CD4515BME4 with 3.3 V microcontrollers.

Can the CD4515BME4 replace the CD4514B in existing designs?

No, the CD4515BME4 cannot directly replace the CD4514B because they implement different decoding functions: CD4514B is a 4-bit latched binary-to-hexadecimal (1-of-16) decoder with active-HIGH outputs, while CD4515BME4 has active-LOW outputs and identical input latching. Swapping them requires inverting all 16 output lines or redesigning downstream logic-making the CD4515BME4 a functional alternative only when active-low enable signaling is already part of the system architecture.

What is the maximum output sink current for the CD4515BME4 at 15 V supply?

At V_DD = 15 V, the CD4515BME4 guarantees a minimum output sink current (I_OL) of 3.2 mA while maintaining V_OL ≤ 0.5 V. This value is derived from TI's CD4000B family characterization data and confirms the CD4515BME4 can reliably drive standard TTL inputs or small-signal relays without external buffering at elevated supply voltages.

Is the CD4515BME4 pin-compatible with other SOIC-24 logic devices?

The CD4515BME4 uses a standard 24-pin SOIC (DW) footprint with 0.65 mm lead pitch, matching JEDEC MO-153. While its pinout is unique to the CD4515B function, the physical package is mechanically compatible with other SOIC-24 devices such as CD4094B or SN74HC595 - meaning PCB land patterns and stencil designs can be reused, but signal routing and schematic symbols must reflect the CD4515BME4's specific input/output assignment and active-low output behavior.