CD4556BMT Equivalent & Substitute Parts

Part Overview

The CD4556BMT is a decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments in the 4000B series. This device implements a 1 x 2:4 decoder/demultiplexer function in a 16-SOIC surface mount package. The CD4556BMT is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

CD4556BMT

Texas InstrumentsIn Stock: 1688CD4556BMT Datasheet

Current PartRFQ

CD4555BM96

Texas InstrumentsIn Stock: 5272CD4555BM96 Datasheet

Parametric EquivalentRFQ

CD4555BMT

Texas InstrumentsIn Stock: 1964CD4555BMT Datasheet

Parametric EquivalentRFQ

CD4556BM96

Texas InstrumentsIn Stock: 5702CD4556BM96 Datasheet

Parametric EquivalentRFQ

MC14556BDR2G

onsemiIn Stock: 2263MC14556BDR2G Datasheet

MFR RecommendedRFQ

NLV14556BDR2G

onsemiIn Stock: 3720NLV14556BDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD4556BMT is determined by strict equivalence across the following critical parameters:

• Circuit configuration (1 x 2:4 decoder/demultiplexer function)
• Independent circuits count (2)
• Package type (16-SOIC with 0.154" width, 3.90mm)
• Voltage supply range (3V ~ 18V dual supply)
• Operating temperature range (-55°C ~ 125°C)
• Surface mount mounting type
• RoHS3 compliance and MSL 1 rating

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments): Parts with identical electrical specifications and package dimensions. These include CD4555BM96, CD4555BMT, and CD4556BM96. Differences exist only in packaging format (Tape & Reel versus Cut Tape) and product status.

Manufacturer Recommended Equivalents (onsemi): Parts MC14556BDR2G and NLV14556BDR2G provide functional equivalence with identical package and voltage specifications. Output current specifications differ slightly (8.8mA versus 6.8mA), remaining within acceptable design margins for decoder/demultiplexer applications.

Parameter Comparison

Engineering Selection Recommendations

For designs currently using CD4556BMT, the following selection criteria apply based on product status and compliance:

Primary Substitutes (Texas Instruments 4000B Series): CD4556BM96 and CD4555BM96 are recommended as primary alternatives. Both maintain Active product status with ROHS3 compliance and MSL 1 rating. CD4556BM96 shares the identical base product number (CD4556) and is available in Tape & Reel format. CD4555BM96 provides equivalent functionality with higher inventory availability (5231 pcs) and Active status.

Secondary Substitutes (onsemi Equivalents): MC14556BDR2G and NLV14556BDR2G are manufacturer-recommended alternatives from onsemi. Both maintain Active product status and full compliance certifications. Output current specifications are higher (8.8mA versus 6.8mA), which is acceptable for decoder/demultiplexer applications where output current capacity exceeds typical design requirements.

Avoid: CD4555BMT is discontinued at DiGi Electronics and should not be selected for new procurement despite parametric equivalence.

Frequently Asked Questions (FAQ)

Q: Can CD4556BM96 directly replace CD4556BMT in existing designs?

A: Yes. CD4556BM96 is a parametric equivalent with identical electrical specifications, package dimensions, and pin configuration. The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Both are 16-SOIC surface mount packages with 0.154" width and 3.90mm height.

Q: What is the difference between CD4556BMT and CD4555BM96?

A: Both are 1 x 2:4 decoder/demultiplexer circuits in 16-SOIC packages with identical electrical specifications. The primary difference is the base product number (CD4556 versus CD4555). Both are functionally equivalent and interchangeable in circuit design. CD4555BM96 has higher current inventory availability.

Q: Are onsemi parts MC14556BDR2G and NLV14556BDR2G compatible with CD4556BMT?

A: Yes, with one specification difference. Both onsemi parts provide identical package, voltage supply range, and operating temperature specifications. Output current is specified at 8.8mA (high and low) compared to 6.8mA for the CD4556BMT. This higher current capacity is compatible with designs using CD4556BMT and does not create functional incompatibility.

Q: Why is CD4555BMT listed but not recommended?

A: CD4555BMT is discontinued at DiGi Electronics and carries Last Time Buy implications. While parametrically equivalent to CD4556BMT, Active status alternatives (CD4556BM96, CD4555BM96) provide better long-term supply assurance.

Q: What packaging formats are available for substitutes?

A: CD4556BM96 and MC14556BDR2G are available in Tape & Reel (TR) format, matching the original CD4556BMT packaging. CD4555BM96 is available in Tape & Reel with Digi-Reel option. CD4555BMT is available in Cut Tape (CT) format. All maintain identical 16-SOIC package dimensions suitable for automated assembly.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (CD4555BM96, CD4555BMT, CD4556BM96, MC14556BDR2G, NLV14556BDR2G) maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original CD4556BMT specifications.