MM74HC4046N Phase Lock Loop IC Equivalent & Substitute Parts

Part Overview

The MM74HC4046N is a Phase Lock Loop (PLL) integrated circuit manufactured by onsemi, designed for clock and timing applications. This 16-DIP package device operates at a maximum frequency of 14MHz with CMOS input and 3-State output configuration. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Substiute Parts

MM74HC4046N

onsemiIn Stock: 1974MM74HC4046N Datasheet

Current PartRFQ

CD74HC4046AE

Harris CorporationIn Stock: 3786CD74HC4046AE Datasheet

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SN74LV4046AN

Texas InstrumentsIn Stock: 6139SN74LV4046AN Datasheet

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CD74HC7046AE

Harris CorporationIn Stock: 1287CD74HC7046AE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MM74HC4046N are qualified based on the following critical parameters:

Mechanical Compatibility: All substitute parts maintain the 16-DIP (0.300", 7.62mm) through-hole package format, ensuring direct socket compatibility.

Functional Classification: All substitutes are Phase Lock Loop (PLL) integrated circuits within the 74HC or 74LV logic families, maintaining functional equivalence for clock and timing applications.

Electrical Parameters: Substitutes operate within overlapping or extended supply voltage ranges (2V ~ 6V or 3V ~ 5.5V) and support CMOS input/output logic levels. Operating temperature ranges extend the original specification in certain substitutes.

Frequency Capability: Substitute parts support maximum frequencies of 38MHz, exceeding the original 14MHz specification, providing enhanced performance headroom.

Input/Output Configuration: Substitutes provide CMOS or CMOS/TTL compatible outputs, compatible with the original CMOS input requirement.

Parameter Comparison

Engineering Selection Recommendations

CD74HC4046AE (Harris Corporation): Direct functional equivalent with identical supply voltage range (2V ~ 6V) and through-hole package. Supports higher frequency operation (38MHz) with extended temperature range (-55°C ~ 125°C). Product status is obsolete. RoHS non-compliant. Suitable for applications requiring extended temperature performance within the 74HC logic family.

SN74LV4046AN (Texas Instruments): Active product status provides long-term availability and supply chain stability. ROHS3 compliant, meeting modern environmental and regulatory requirements. Operates within 3V ~ 5.5V supply range, requiring verification of compatibility with 2V minimum supply applications. Supports 38MHz frequency operation with extended temperature range (-40°C ~ 125°C). TTL input/output compatibility provides additional interface flexibility.

CD74HC7046AE (Harris Corporation): Maintains identical input:output ratio (1:2) as the original MM74HC4046N, providing closest functional alignment. Supports 2V ~ 6V supply voltage range with extended temperature operation (-55°C ~ 125°C). Product status is obsolete. RoHS non-compliant. Suitable for applications requiring exact ratio matching and wide temperature performance.

Frequently Asked Questions (FAQ)

Q: Can the MM74HC4046N be directly replaced with any of these substitutes?

A: All substitute parts share the 16-DIP (0.300", 7.62mm) through-hole package format, enabling direct socket replacement. However, electrical parameter differences require verification. The CD74HC7046AE maintains the closest functional match with identical 1:2 input:output ratio. The SN74LV4046AN requires supply voltage verification if the application uses the 2V minimum specification of the original part.

Q: What is the primary difference between CD74HC4046AE and CD74HC7046AE?

A: Both are Harris Corporation 74HC series devices with identical supply voltage (2V ~ 6V) and extended temperature ranges (-55°C ~ 125°C). The key difference is the input:output ratio: CD74HC4046AE provides 1:4 ratio, while CD74HC7046AE provides 1:2 ratio, matching the original MM74HC4046N specification.

Q: Why is SN74LV4046AN listed as active while others are obsolete?

A: SN74LV4046AN is manufactured by Texas Instruments and maintains active product status, indicating ongoing production and availability. The other substitutes (CD74HC4046AE and CD74HC7046AE) are obsolete products from Harris Corporation. For new designs requiring long-term component availability, SN74LV4046AN is the preferred selection.

Q: Does the SN74LV4046AN work with 2V supply voltage?

A: No. SN74LV4046AN operates within 3V ~ 5.5V supply range, which does not include the 2V minimum specification of the original MM74HC4046N. Applications requiring 2V operation must use CD74HC4046AE or CD74HC7046AE.

Q: What does the input:output ratio mean for PLL selection?

A: The input:output ratio defines the frequency division or multiplication relationship within the PLL circuit. MM74HC4046N and CD74HC7046AE both use 1:2 ratio, meaning the output frequency is twice the input frequency. CD74HC4046AE uses 1:4 ratio, producing output frequency four times the input. SN74LV4046AN uses 1:3 ratio. Application requirements determine which ratio is appropriate.

Q: Are there RoHS compliance considerations?

A: SN74LV4046AN is ROHS3 compliant, meeting current environmental regulations. CD74HC4046AE and CD74HC7046AE are RoHS non-compliant. For applications subject to RoHS requirements, SN74LV4046AN is the only compliant option among the substitutes.