CD40105BDMSR Equivalent & Substitute Parts

Part Overview

The CD40105BDMSR is an asynchronous FIFO logic circuit with 64-bit memory capacity (16 x 4 configuration) manufactured by Renesas Electronics Corporation. This device operates as a uni-directional FIFO with a maximum data rate of 4MHz and is housed in a 16-SBDIP package. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

CD40105BDMSR

Renesas Electronics CorporationIn Stock: 793CD40105BDMSR Datasheet

Current PartRFQ

CD40105BE

Harris CorporationIn Stock: 1188CD40105BE Datasheet

DirectRFQ

CD40105BF

Texas InstrumentsIn Stock: 1148CD40105BF Datasheet

DirectRFQ

CD40105BF3A

Texas InstrumentsIn Stock: 1752CD40105BF3A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD40105BDMSR are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Compatibility Criteria:

• Memory Size: 64 (16 x 4) configuration
• Function: Asynchronous FIFO operation
• Bus Directional: Uni-Directional
• Mounting Type: Through Hole
• Package Type: 16-pin DIP variants (16-CDIP or 16-PDIP)
• Operating Temperature Range: -55°C ~ 125°C

Voltage Supply Range: Substitute parts must operate within or encompass the original 20V specification. Parts with wider voltage ranges (3V ~ 18V) are not direct substitutes due to the maximum voltage limitation.

Data Rate Consideration: The original part specifies 4MHz. Substitute parts with higher data rates (8MHz) maintain backward compatibility while offering enhanced performance capability.

The three qualified substitute parts share the identical memory configuration, FIFO function, uni-directional bus architecture, and temperature operating range. All are mounted through-hole in 16-pin DIP packages compatible with the original footprint.

Parameter Comparison

Engineering Selection Recommendations

CD40105BE (Harris Corporation): This substitute maintains obsolete product status and shares identical memory configuration and operating temperature range. However, the voltage supply specification of 3V ~ 18V does not encompass the original 20V maximum rating, presenting a voltage compatibility limitation. This part is suitable only for applications where the 20V specification is not required.

CD40105BF (Texas Instruments): This substitute is classified as active product status, ensuring continued availability and manufacturing support. It provides 8MHz data rate capability compared to the original 4MHz specification, offering performance enhancement. The voltage supply range of 3V ~ 18V does not match the original 20V specification. RoHS3 compliance is provided. This part is recommended for new designs and applications where the 20V supply voltage is not a requirement.

CD40105BF3A (Texas Instruments): This substitute is classified as active product status with identical specifications to CD40105BF, including 8MHz data rate and RoHS3 compliance. The voltage supply range of 3V ~ 18V does not encompass the original 20V maximum rating. This variant is suitable for applications requiring active product status and modern compliance certifications where the 20V supply voltage is not required.

Frequently Asked Questions (FAQ)

Q: Can CD40105BE, CD40105BF, or CD40105BF3A be used as direct replacements for CD40105BDMSR?

A: All three substitute parts share the same 64-bit (16 x 4) asynchronous FIFO memory configuration, uni-directional bus architecture, and -55°C to 125°C operating temperature range. All are mounted through-hole in 16-pin DIP packages. However, the voltage supply specifications differ: the original part specifies 20V maximum, while all substitutes specify 3V ~ 18V maximum. Direct replacement is possible only in applications where the 20V supply voltage is not required.

Q: What is the difference between CD40105BF and CD40105BF3A?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications, including 8MHz data rate, 3V ~ 18V supply voltage range, and RoHS3 compliance. The primary difference is the part number suffix, which typically indicates manufacturing date code or packaging variant. Both are active products suitable for equivalent substitution.

Q: Why do the substitute parts have a lower maximum supply voltage than the original?

A: The CD40105BDMSR specifies 20V maximum supply voltage, while substitute parts from Harris Corporation and Texas Instruments specify 3V ~ 18V maximum. This reflects different design generations and manufacturing standards. Substitution is appropriate only when system supply voltage does not exceed 18V.

Q: Are the substitute parts available in the same package as the original?

A: The original CD40105BDMSR uses a 16-SBDIP package. CD40105BF and CD40105BF3A use 16-CDIP packages, which are mechanically compatible 16-pin DIP variants with identical 0.300" (7.62mm) spacing. CD40105BE uses a 16-PDIP package, also mechanically compatible. All three packages are through-hole mounted and footprint-compatible.

Q: Which substitute part should be selected for new designs?

A: CD40105BF or CD40105BF3A are recommended for new designs due to active product status, ensuring long-term availability and manufacturing support. Both provide RoHS3 compliance and 8MHz data rate capability. Selection between these two depends on specific packaging or availability requirements, as their electrical specifications are identical.

Q: What is the significance of RoHS compliance in these parts?

A: CD40105BF and CD40105BF3A are RoHS3 compliant, indicating compliance with Restriction of Hazardous Substances regulations. CD40105BE is RoHS non-compliant. RoHS compliance is relevant for applications subject to environmental or regulatory requirements, particularly in European markets or regulated industries.