CD4508BE Equivalent & Substitute Parts

Part Overview

The CD4508BE is a D-Type Transparent Latch dual 4-bit logic IC manufactured by Texas Instruments, designed for digital signal latching and storage applications. This component operates across a wide supply voltage range of 3V to 18V and features two independent 8:8 circuits with standard output configuration. The CD4508BE is classified as obsolete, which necessitates identification of functionally equivalent substitute components for ongoing design requirements and production continuity.

Substiute Parts

CD4508BE

Texas InstrumentsIn Stock: 1179CD4508BE Datasheet

Current PartRFQ

CD4508BM96

Texas InstrumentsIn Stock: 5124CD4508BM96 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD4508BE is determined by strict equivalence across the following critical parameters:

• Logic Function: D-Type Transparent Latch architecture with identical circuit topology (8:8 configuration, 2 independent circuits)
• Electrical Specifications: Matching supply voltage range (3V ~ 18V), propagation delay (50ns), and output current ratings (6.8mA high and low)
• Operating Conditions: Identical temperature range (-55°C ~ 125°C)
• Compliance & Certifications: ROHS3 compliance, REACH unaffected status, and EAR99 classification
• Base Product Number: CD4508 series designation

The primary distinction between the main part and substitute relates to packaging and mounting technology. The CD4508BE utilizes through-hole 24-DIP packaging, while the substitute employs surface-mount 24-SOIC packaging. Both variants share identical electrical performance and functional characteristics, making them electrically interchangeable when PCB layout and assembly processes accommodate the packaging difference.

Parameter Comparison

Engineering Selection Recommendations

The CD4508BM96 serves as the direct functional equivalent to the obsolete CD4508BE. Both components maintain identical electrical specifications, logic architecture, and performance characteristics across all operating conditions. The CD4508BM96 carries active product status from Texas Instruments, ensuring continued availability and supply chain reliability compared to the obsolete CD4508BE.

Selection between these variants depends on PCB design constraints and assembly capabilities. The CD4508BE requires through-hole mounting technology and accommodates legacy PCB designs with DIP socket compatibility. The CD4508BM96 employs surface-mount technology, reducing PCB footprint and enabling automated assembly processes typical of modern manufacturing environments.

Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications. The electrical interchangeability of these parts ensures functional compatibility when PCB layout and assembly processes are adapted to accommodate the packaging difference.

Frequently Asked Questions (FAQ)

Q: Are CD4508BE and CD4508BM96 electrically interchangeable?

A: Yes. Both components share identical electrical specifications, including supply voltage range (3V ~ 18V), propagation delay (50ns), output current ratings (6.8mA), and operating temperature range (-55°C ~ 125°C). The logic function and circuit configuration are identical.

Q: What is the primary difference between these two parts?

A: The primary difference is packaging and mounting technology. The CD4508BE uses through-hole 24-DIP packaging, while the CD4508BM96 uses surface-mount 24-SOIC packaging. This affects PCB layout, assembly process, and footprint size.

Q: Can I use CD4508BM96 as a direct replacement for CD4508BE on existing PCBs?

A: Direct PCB replacement is not possible without redesign. The CD4508BE requires DIP socket or through-hole pads, while the CD4508BM96 requires SOIC surface-mount pads. PCB layout modification and assembly process changes are necessary.

Q: Why is the CD4508BE listed as obsolete?

A: The CD4508BE is obsolete due to manufacturing discontinuation by Texas Instruments. The CD4508BM96 represents the active product continuation within the CD4508 series, utilizing modern surface-mount packaging technology.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the CD4508BE and CD4508BM96 are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: What is the pin count for both packages?

A: Both components feature 24 pins. The CD4508BE uses 24-DIP (0.600" width, 15.24mm) through-hole packaging, while the CD4508BM96 uses 24-SOIC (0.295" width, 7.50mm) surface-mount packaging.