MM74HC4046M Phase Lock Loop (PLL) IC Equivalent & Substitute Parts

Part Overview

The MM74HC4046M is a Phase Lock Loop (PLL) integrated circuit manufactured by onsemi, designed for clock and timing applications. This 16-SOIC surface mount device operates at a maximum frequency of 14MHz with a supply voltage range of 2V to 6V and an operating temperature range of -40°C to 85°C. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

MM74HC4046M

onsemiIn Stock: 50239MM74HC4046M Datasheet

Current PartRFQ

74HCT4046AD,118

NXP SemiconductorsIn Stock: 6520874HCT4046AD,118 Datasheet

DirectRFQ

HEF4046BT,653

Nexperia USA Inc.In Stock: 11346HEF4046BT,653 Datasheet

DirectRFQ

74HC4046AD,653

NXP SemiconductorsIn Stock: 7795474HC4046AD,653 Datasheet

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CD74HC4046AM

Texas InstrumentsIn Stock: 1704CD74HC4046AM Datasheet

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CD74HC4046AM96

Texas InstrumentsIn Stock: 19600CD74HC4046AM96 Datasheet

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CD74HC4046AMT

Texas InstrumentsIn Stock: 1301CD74HC4046AMT Datasheet

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CD74HC7046AM

Harris CorporationIn Stock: 2315CD74HC7046AM Datasheet

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CD74HC7046AM96

Texas InstrumentsIn Stock: 3494CD74HC7046AM96 Datasheet

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CD74HC7046AMT

Texas InstrumentsIn Stock: 993CD74HC7046AMT Datasheet

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CD74HC4046ANSR

Texas InstrumentsIn Stock: 1984CD74HC4046ANSR Datasheet

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SN74LV4046AD

Texas InstrumentsIn Stock: 1237SN74LV4046AD Datasheet

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SN74LV4046ADR

Texas InstrumentsIn Stock: 3220SN74LV4046ADR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74HC4046M is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 16-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility.

Electrical Compatibility: Supply voltage range, maximum frequency rating, input/output signal types, and operating temperature range must support the application requirements of the original design.

Functional Equivalence: The part must function as a Phase Lock Loop (PLL) IC with a single circuit configuration.

Series Compatibility: Parts from the 74HC, 74HCT, and HE4000B logic families are considered compatible based on their PLL functionality and package specifications.

Substitute parts are categorized as:

• Direct Substitutes: Parts with identical or superior electrical specifications and active product status
• Upgrade Options: Parts with enhanced performance characteristics (higher frequency ratings, extended temperature ranges, improved compliance)
• Similar Parts: Parts with package variations that may require PCB layout adjustments

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Active Status:

The 74HC4046AD,653 (NXP Semiconductors) provides the most straightforward upgrade path. It maintains the same 16-SOIC (0.154", 3.90mm) package footprint, operates within the original 2V to 6V supply range, and is currently in active production status. The extended operating temperature range (-40°C to 125°C) and higher maximum frequency (21MHz) offer improved performance margins over the obsolete MM74HC4046M.

For Enhanced Performance:

The CD74HC4046AM, CD74HC4046AM96, and CD74HC4046AMT (all Texas Instruments) deliver superior specifications with a maximum frequency of 38MHz, extended temperature range (-55°C to 125°C), and RoHS3 compliance. These parts maintain voltage supply compatibility (2V to 6V) and identical package dimensions. The different packaging options (Tube, Cut Tape & Digi-Reel, Tape & Reel) accommodate various procurement and assembly workflows.

For Input:Output Ratio Matching:

If the 1:2 input:output ratio is functionally critical, the CD74HC7046AM96 or CD74HC7046AMT (Texas Instruments) are active alternatives with identical ratio specifications, higher frequency capability (38MHz), and extended temperature range. Both maintain the required 16-SOIC (0.154", 3.90mm) package.

For Wide Supply Voltage Range:

The HEF4046BT,653 (Nexperia USA Inc.) supports a broader supply voltage range (3V to 15V) and maintains the original operating temperature range (-40°C to 85°C). However, its maximum frequency is limited to 2.7MHz, making it suitable only for low-frequency applications.

Package Variation Consideration:

The CD74HC4046ANSR uses a 16-SOIC (0.209", 5.30mm) package, which differs from the original 0.154" width. This part requires PCB layout verification and is not recommended as a direct footprint replacement without design modification.

Frequently Asked Questions (FAQ)

Q: Can I use the 74HCT4046AD,118 as a direct replacement for the MM74HC4046M?

A: The 74HCT4046AD,118 maintains the same 16-SOIC (0.154", 3.90mm) package and is in active production. However, its supply voltage range is restricted to 4.5V to 5.5V, compared to the original 2V to 6V range. Use this part only if your application operates within the 4.5V to 5.5V window.

Q: What is the difference between CD74HC4046AM and CD74HC7046AM?

A: Both are Texas Instruments Phase Lock Loop ICs in the same package with identical frequency and voltage specifications. The primary difference is the input:output ratio: CD74HC4046AM provides 1:4 ratio, while CD74HC7046AM provides 1:2 ratio. Select based on your circuit's frequency division requirements.

Q: Are the different packaging options (Tube, Cut Tape, Tape & Reel) electrically equivalent?

A: Yes. Tube, Cut Tape & Digi-Reel, and Tape & Reel packaging options contain electrically identical components. The packaging difference affects only procurement, storage, and assembly handling. Select based on your manufacturing process requirements.

Q: Why does the CD74HC4046ANSR have a different package width?

A: The CD74HC4046ANSR uses a 16-SOIC (0.209", 5.30mm) package, which is a wider variant of the standard 16-SOIC (0.154", 3.90mm). This package variation requires different PCB footprint design and is not a direct pin-compatible replacement without layout modification.

Q: Is the HEF4046BT,653 suitable for high-frequency applications?

A: No. The HEF4046BT,653 has a maximum frequency rating of 2.7MHz, significantly lower than the original MM74HC4046M (14MHz) and other active alternatives (21MHz to 38MHz). Use this part only for applications requiring frequencies below 2.7MHz.

Q: What compliance certifications should I consider for new designs?

A: For new designs, prioritize parts with RoHS3 compliance and REACH Unaffected status. The CD74HC4046AM, CD74HC4046AM96, CD74HC4046AMT, CD74HC7046AM96, and CD74HC7046AMT all meet these compliance requirements, ensuring compatibility with current environmental and regulatory standards.