CD4521BPWR Equivalent & Substitute Parts

Part Overview

The CD4521BPWR is a Counter IC Divide-by-2 logic component manufactured by Texas Instruments, part of the 4000B series. This 24-bit divider operates as a single-element counter with negative edge triggering and asynchronous reset functionality. The device is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design requirements and procurement planning. The CD4521BPWR is housed in a 16-TSSOP surface mount package and operates across a wide supply voltage range of 3V to 18V with a maximum count rate of 13 MHz.

Substiute Parts

CD4521BPWR

Texas InstrumentsIn Stock: 957CD4521BPWR Datasheet

Current PartRFQ

CD4521BPW

Texas InstrumentsIn Stock: 2519CD4521BPW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD4521BPWR is determined by strict equivalence across the following critical parameters:

Logic Function: Both parts must implement Divide-by-2 counter functionality with identical bit width (24-bit) and single element configuration.

Electrical Characteristics: Supply voltage range (3V to 18V), count rate (13 MHz), trigger type (negative edge), and asynchronous reset must remain unchanged.

Package Compatibility: The 16-TSSOP surface mount package with 0.173" width (4.40mm) is mandatory for PCB layout compatibility.

Operating Conditions: Temperature range (-55°C to 125°C) and all timing specifications must be maintained.

Compliance Standards: RoHS3 compliance and MSL rating (1 - Unlimited) must be preserved.

The CD4521BPW qualifies as a direct substitute based on identical electrical specifications, package configuration, and compliance certifications. The primary distinction is product status: CD4521BPW is active and available, whereas CD4521BPWR is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The CD4521BPW is a direct functional and electrical equivalent to the CD4521BPWR. Both components share identical logic specifications, electrical performance parameters, and package configuration. The CD4521BPW is the recommended selection for new designs and component replacement due to its active product status and confirmed availability. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current manufacturing standards. The transition from CD4521BPWR to CD4521BPW requires no circuit modifications, PCB layout changes, or firmware adjustments.

Frequently Asked Questions (FAQ)

Q: Can CD4521BPW be used as a direct replacement for CD4521BPWR in existing designs?

A: Yes. The CD4521BPW is electrically and functionally identical to the CD4521BPWR across all specified parameters. No design modifications are required for substitution.

Q: What is the primary reason for substituting CD4521BPWR with CD4521BPW?

A: The CD4521BPWR is classified as obsolete, while the CD4521BPW maintains active product status with confirmed inventory availability. This ensures long-term supply chain reliability.

Q: Are there any package or pinout differences between these parts?

A: No. Both components use the identical 16-TSSOP surface mount package with 0.173" width (4.40mm). Pinout and PCB footprint compatibility is guaranteed.

Q: Do both parts meet current compliance requirements?

A: Yes. Both the CD4521BPWR and CD4521BPW are ROHS3 compliant and REACH unaffected, meeting current regulatory standards.

Q: What is the operational difference between these parts?

A: There is no operational difference. Both parts implement the same Divide-by-2 counter logic with 24-bit width, negative edge triggering, asynchronous reset, and identical electrical specifications.

Q: Is there a packaging difference between CD4521BPWR and CD4521BPW?

A: The primary packaging difference is the distribution format. CD4521BPWR uses standard packaging, while CD4521BPW is supplied in tube packaging. Both maintain identical component specifications and 16-TSSOP case configuration.