Texas Instruments CD4048BM

Overview

CD4048BM from Texas Instruments is a CMOS multifunction expandable logic gate IC with eight primary inputs plus an EXPAND input enabling cascaded 16-input configurations; operates over -55°C to +125°C, supports 3V–18V VDD, and features low power consumption (typ. 10 nA at VDD = 10 V). It serves in reconfigurable logic control for industrial timing sequencers and programmable logic arrays.

For engineers reviewing the CD4048BM datasheet, CD4048BM pinout, CD4048BM application, or CD4048BM equivalent, key selection considerations include its expandable 8+1 input architecture, SOIC-16 package compatibility with surface-mount production, wide supply voltage range, and legacy CMOS noise immunity in mixed-signal control subsystems.

Technical Context

The CD4048BM implements a single 8-input multifunction gate with selectable logic mode (OR, NOR, AND, NAND) via three mode-select inputs (A, B, C), allowing real-time reconfiguration without external logic. Its EXPAND input enables direct cascading of two devices to form a 16-input gate while preserving mode select control across both units.

Designed for high-noise industrial environments, it uses standard CMOS silicon with Schmitt-trigger inputs on all signal pins (including EXPAND), ensuring reliable operation under slow-rising or noisy control signals; propagation delay is 120 ns max at VDD = 15 V and CL = 50 pF.

Key Specifications

Pinout & Package

CD4048BM is housed in a 16-pin SOIC (D) package per JEDEC MO-153, 3.9 mm body width, 1.75 mm height, 1.27 mm pitch, with gull-wing leads and exposed metal pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multifunction logic gate applications.

Compared with CD4048BM, CD4049UBM provides only inversion without logic flexibility or expansion, while SN74HC151DR offers multiplexing but no reconfigurable Boolean operations-neither supports the CD4048BM's core value of in-system programmable logic with scalable input width.

Availability

CD4048BM is available at Aetrix Electronics and suitable for industrial PLC logic sequencers, automotive body control modules, legacy system logic retrofits, and low-power sensor interface hubs requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4048BM 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and consumer markets.

The CD4048BM belongs to TI's legacy CMOS logic family designed for robust, wide-voltage reconfigurable logic in harsh-environment control systems where programmability and noise immunity are critical.

FAQ

What logic functions does the CD4048BM support and how are they selected?

The CD4048BM supports OR, NOR, AND, and NAND functions, selected via three binary-coded mode-select inputs (A, B, C) on pins 10–12. Each unique combination configures the internal gate array accordingly; for example, A=LOW, B=LOW, C=LOW selects OR mode. This selection is static during operation and does not require clocking. The CD4048BM datasheet defines all eight combinations, with four reserved for the primary logic modes and the rest for test or undefined states.

Can the CD4048BM operate from a 3.3V supply?

Yes, the CD4048BM supports VDD from 3 V to 18 V, making it fully compatible with 3.3V systems. At 3.3V, output drive strength is reduced (IOH/IOL ≈ ±1.5 mA), and propagation delay increases to ~250 ns (CL = 50 pF), but logic thresholds remain valid. Input hysteresis scales with VDD, so noise margin is preserved. The CD4048BM maintains full functionality across this range without external components.

How is the EXPAND input used to cascade two CD4048BM devices?

To cascade two CD4048BM devices into a 16-input gate, connect the output (pin 13) of the first CD4048BM to the EXPAND input (pin 9) of the second CD4048BM, and tie the EXPAND input of the first device to VSS. Both devices must share identical mode-select settings (pins 10–12). The final output is taken from the second CD4048BM's pin 13. This configuration implements a 16-input logic function determined by the shared mode code, as documented in Figure 2 of the CD4048BM datasheet.

Is the CD4048BM still in active production and what packaging is available?

The CD4048BM is marked as Obsolete in TI's official packaging addendum, but the functionally identical CD4048BM96.A variant remains Active in SOIC-16 tape-and-reel packaging (2500 units/reel). Both share identical electrical specs, pinout, and marking "CD4048BM". Aetrix Electronics stocks the CD4048BM96.A as the supported production version of the CD4048BM for new designs and legacy replacements.

Does the CD4048BM include Schmitt-trigger inputs on all signal pins?

Yes, the CD4048BM incorporates Schmitt-trigger circuitry on all nine signal inputs: pins 1–8 (primary inputs) and pin 9 (EXPAND). This design ensures clean signal transitions and noise immunity, especially critical for slow-rising signals from mechanical switches or long PCB traces. Input hysteresis is approximately 1.5 V at VDD = 15 V and scales linearly with supply voltage, a feature confirmed in the CD4048BM electrical characteristics table.