CD4047BCMX Equivalent & Substitute Parts

Part Overview

The CD4047BCMX is a monostable multivibrator logic integrated circuit manufactured by onsemi, housed in a 14-SOIC surface mount package. This device operates across a wide supply voltage range of 3V to 15V with a propagation delay of 80 nanoseconds and supports both astable and monostable operation modes. The CD4047BCMX is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

CD4047BCMX

onsemiIn Stock: 3431CD4047BCMX Datasheet

Current PartRFQ

CD4047BM

Texas InstrumentsIn Stock: 2220CD4047BM Datasheet

SimilarRFQ

CD4047BM96

Texas InstrumentsIn Stock: 37847CD4047BM96 Datasheet

SimilarRFQ

CD4047BMG4

Texas InstrumentsIn Stock: 714CD4047BMG4 Datasheet

SimilarRFQ

CD4047BMT

Texas InstrumentsIn Stock: 698CD4047BMT Datasheet

SimilarRFQ

CD4047BNSR

Texas InstrumentsIn Stock: 2764CD4047BNSR Datasheet

SimilarRFQ

HEF4047BT,653

Nexperia USA Inc.In Stock: 2216HEF4047BT,653 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD4047BCMX is determined by the following critical parameters:

Primary Substitution Criteria:

• Logic type (astable and monostable capability)
• Propagation delay (80 ns nominal)
• Package type (14-SOIC surface mount)
• Supply voltage range compatibility (minimum 3V to 15V overlap)
• Operating temperature range (-55°C to 125°C)
• Independent circuits count (1 circuit)

Grouping Logic: Substitute parts are grouped into two categories based on parameter alignment:

Group 1 - Direct Substitutes (Texas Instruments CD4047 variants): CD4047BM, CD4047BM96, CD4047BMG4, and CD4047BMT maintain identical logic functionality, propagation delay (80 ns), and package specifications. These parts operate across 3V to 18V, providing extended upper voltage range compatibility. All are 4000B series devices with identical pin configuration and electrical characteristics within acceptable tolerances.

Group 2 - Compatible Alternative (Nexperia HEF4047BT,653): The HEF4047BT,653 provides equivalent astable and monostable functionality within the 4000B series but operates at 50 ns propagation delay (faster than the 80 ns specification) and has a narrower supply voltage range (4.5V to 15.5V). Package dimensions differ slightly (0.154" width maintained, but classified as 14-SO versus 14-SOIC).

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - CD4047BM96 (Texas Instruments): The CD4047BM96 is the preferred substitute for the CD4047BCMX. This part maintains active product status, ensuring long-term availability and supply chain stability. It provides identical propagation delay (80 ns), logic functionality, and package dimensions. The extended supply voltage range (3V to 18V) encompasses the original specification. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) align with modern manufacturing standards.

Secondary Recommendation - CD4047BNSR (Texas Instruments): The CD4047BNSR offers active product status with identical electrical specifications and operating temperature range. The package width differs (5.30mm versus 3.90mm), requiring PCB layout verification. This part is suitable for applications where the wider package footprint is accommodated in the design.

Alternative Recommendation - HEF4047BT,653 (Nexperia USA Inc.): The HEF4047BT,653 provides active product status and identical package dimensions (0.154" width). The 50 ns propagation delay is faster than the 80 ns specification, which may be acceptable in applications where timing margin exists. The narrower operating temperature range (-40°C to 85°C) and supply voltage range (4.5V to 15.5V) require design verification for compliance with system requirements.

Avoid - Discontinued Variants: CD4047BM, CD4047BMG4, and CD4047BMT are discontinued at DiGi Electronics and should not be selected for new designs or long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can the CD4047BM96 directly replace the CD4047BCMX without PCB modifications? A: Yes. The CD4047BM96 maintains identical pin configuration, package dimensions (14-SOIC, 0.154" width), and electrical specifications. No PCB layout changes are required.

Q: What is the significance of the propagation delay difference between CD4047BM96 (80 ns) and HEF4047BT,653 (50 ns)? A: Both parts meet the 80 ns specification, with HEF4047BT,653 providing faster response. The 50 ns delay of the Nexperia part is a performance enhancement. Applications with timing-critical requirements should verify that the faster propagation delay does not introduce unintended circuit behavior.

Q: Are there supply voltage compatibility concerns when substituting with CD4047BM96? A: No. The CD4047BM96 operates across 3V to 18V, which fully encompasses the original CD4047BCMX specification of 3V to 15V. The extended upper range provides additional design flexibility.

Q: Why does CD4047BNSR have a different package width (5.30mm versus 3.90mm)? A: The CD4047BNSR uses a 14-SO package variant with wider body dimensions compared to the standard 14-SOIC. PCB footprint compatibility must be verified before selection. Pin pitch and electrical characteristics remain identical.

Q: Is the HEF4047BT,653 suitable for applications requiring -55°C operation? A: No. The HEF4047BT,653 operates from -40°C to 85°C, which does not meet the original -55°C lower temperature specification. Applications requiring extended low-temperature operation must use CD4047BM96 or CD4047BNSR.

Q: What does ROHS3 compliance mean for these substitute parts? A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive, restricting lead and other hazardous materials. All active substitute parts (CD4047BM96, CD4047BNSR, HEF4047BT,653) meet this environmental standard.

Q: Can multiple substitute parts be used interchangeably within the same production batch? A: CD4047BM96 and CD4047BNSR are interchangeable from an electrical standpoint, provided PCB layout accommodates the package width difference for BNSR. HEF4047BT,653 introduces propagation delay and temperature range differences that may require circuit-level validation before mixed-part production is approved.