Texas Instruments CD4508BM96

Overview

CD4508BM96 from Texas Instruments is a dual 4-bit latch IC in the CD4000B CMOS logic family, designed for data storage and bus isolation in digital systems. It features two independent 4-bit transparent latches, operates over –55°C to +125°C, supports 3V–18V supply voltage, and exhibits low static current (≤1 µA at 18 V). It is commonly used in industrial control panels requiring non-volatile data hold during signal arbitration.

For engineers reviewing the CD4508BM96 datasheet, CD4508BM96 pinout, CD4508BM96 application, or CD4508BM96 equivalent, key selection considerations include its dual-latch architecture, wide V_DD range, TTL/CMOS compatibility, input hysteresis for noise immunity, and SOIC-24 packaging with NIPDAU lead finish and Level-1 moisture sensitivity rating.

Technical Context

The CD4508BM96 implements two independent 4-bit transparent latches with separate enable (LE) and output enable (OE) controls per latch. Each latch has true and complement outputs, enabling bidirectional bus interfacing without external inverters.

It uses standard CD4000B-series silicon-gate CMOS technology, delivering high noise immunity (typ. 50% V_DD), rail-to-rail output swing, and propagation delays of 100 ns max at 10 V (CL = 50 pF). Input thresholds are referenced to V_DD/2, ensuring compatibility across mixed-voltage logic domains.

Key Specifications

Pinout & Package

CD4508BM96 is housed in a 24-pin SOIC (DW) package measuring 7.5 mm × 15.4 mm × 2.3 mm (max height), with 1.27 mm pitch, NIPDAU lead finish, and JEDEC MO-153 compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-bit latch applications.

Compared with MC14508BCP and 74HC173PW, CD4508BM96 uniquely supports 3 V operation and provides true/complement outputs per latch-critical for low-power, noise-immune, and dual-rail interface designs where asynchronous capture and output flexibility are mandatory.

Availability

CD4508BM96 is available at Aetrix Electronics and suitable for industrial control panels, automotive diagnostic tools, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD4508BM96 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 CMOS logic innovation and industrial-grade reliability validation.

The CD4000B series-including CD4508BM96-was engineered for robustness in harsh environments, targeting applications demanding wide voltage tolerance, high noise immunity, and long-term parametric stability without refresh or calibration.

FAQ

What is the maximum clock frequency supported by CD4508BM96?

CD4508BM96 does not operate on a clock signal-it is a transparent latch controlled by level-sensitive enable inputs (LE_A/LE_B). Its usable data rate depends on propagation delay and setup/hold timing. At 10 V supply and 50 pF load, max toggle rate is ~5 MHz for reliable capture; higher rates require tighter layout control and reduced capacitive loading to maintain timing margins for CD4508BM96.

Is CD4508BM96 pin-compatible with CD4508BF3A?

No-CD4508BM96 uses a 24-pin SOIC (DW) package with 1.27 mm pitch, while CD4508BF3A uses a 24-pin ceramic DIP (J) package with 2.54 mm pitch. Though functionally identical and sharing the same pin numbering scheme, their physical footprints, thermal profiles, and reflow requirements differ significantly. Board redesign is required to substitute CD4508BM96 for CD4508BF3A or vice versa.

Does CD4508BM96 support 3.3 V logic levels?

Yes-CD4508BM96 operates down to 3 V supply, with guaranteed performance including propagation delay, noise margin, and output drive. At 3.3 V, its inputs recognize logic HIGH above 2.0 V and logic LOW below 1.3 V, making it fully interoperable with 3.3 V microcontrollers and FPGAs without level translation. This capability is explicitly validated in the CD4508BM96 datasheet under "DC Electrical Characteristics".

Can CD4508BM96 be used as a replacement for 74LS373 in existing designs?

CD4508BM96 is not a drop-in replacement for 74LS373 due to fundamental architectural differences: 74LS373 is a single 8-bit latch with common enable, while CD4508BM96 contains two independent 4-bit latches with separate enables and true/complement outputs. Interfacing requires rewiring to map D0–D3/Q0–Q3 to one half and D4–D7/Q4–Q7 to the other. Additionally, CD4508BM96's CMOS inputs draw negligible current versus LS TTL's 20 µA sink, eliminating pull-up resistor dependencies present in 74LS373 designs.

What is the meaning of the "M96" suffix in CD4508BM96?

The "M96" suffix in CD4508BM96 indicates a specific packaging variant: 24-pin SOIC (DW) package supplied in large tape-and-reel format (2000 units per reel), RoHS-compliant with NIPDAU lead finish, and rated for Level-1 moisture sensitivity (unlimited floor life at ≤30°C/60% RH). This distinguishes it from other variants like CD4508BM (same package but unspecified reel quantity) or CD4508BPW (TSSOP package).