MM74HC4046MX Equivalent & Substitute Parts

Part Overview

The MM74HC4046MX is a Phase Lock Loop (PLL) integrated circuit manufactured by onsemi, housed in a 16-SOIC package with a maximum operating frequency of 14MHz. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The part operates across a supply voltage range of 2V to 6V with CMOS input and 3-state output configuration, designed for single-circuit phase locking applications with a 1:2 input-to-output ratio.

Key Parameters

Parameter	MM74HC4046MX
Manufacturer	onsemi
Series	74HC
Type	Phase Lock Loop (PLL)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Frequency - Max	14MHz
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C
Input Type	CMOS
Output Type	3-State
Ratio - Input:Output	1:2
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MM74HC4046MX is determined by the following critical parameters: package compatibility (16-SOIC form factor), supply voltage range overlap, operating temperature range, input/output signal types, and frequency capability. Parts are grouped into three categories based on their relationship to the original specification:

Direct Substitutes maintain identical or superior electrical performance within the same package footprint and voltage specifications, allowing pin-for-pin replacement.

Upgrade Options provide enhanced performance characteristics (higher frequency capability, extended temperature range, or improved compliance status) while maintaining package and voltage compatibility.

Similar Alternatives share the same functional classification and package family but may have minor dimensional variations or different electrical specifications requiring design verification.

The key parameters governing substitution eligibility are: 16-SOIC package format, 2V–6V supply voltage compatibility, CMOS-compatible input/output, and surface mount technology.

Parameter Comparison

Part Number	Manufacturer	Series	Frequency - Max	Voltage - Supply	Operating Temperature	Input Type	Output Type	Ratio - Input:Output	Package / Case	Product Status
MM74HC4046MX	onsemi	74HC	14MHz	2V ~ 6V	-40°C ~ 85°C	CMOS	3-State	1:2	16-SOIC (0.154", 3.90mm)	Obsolete
74HCT4046AD,118	NXP Semiconductors	74HCT	21MHz	4.5V ~ 5.5V	-40°C ~ 125°C	Clock	Clock	1:1	16-SOIC (0.154", 3.90mm)	Active
CD74HC4046AM96	Texas Instruments	74HC	38MHz	2V ~ 6V	-55°C ~ 125°C	CMOS	CMOS	1:4	16-SOIC (0.154", 3.90mm)	Active
HEF4046BT,653	Nexperia USA Inc.	HE4000B	2.7MHz	3V ~ 15V	-40°C ~ 85°C	Clock	Clock	1:4	16-SOIC (0.154", 3.90mm)	Active
74HC4046AD,653	NXP Semiconductors	74HC	21MHz	3V ~ 6V	-40°C ~ 125°C	Clock	Clock	1:1	16-SOIC (0.154", 3.90mm)	Active
CD74HC4046AM	Texas Instruments	74HC	38MHz	2V ~ 6V	-55°C ~ 125°C	CMOS	CMOS	1:4	16-SOIC (0.154", 3.90mm)	Active
CD74HC4046AMT	Texas Instruments	74HC	38MHz	2V ~ 6V	-55°C ~ 125°C	CMOS	CMOS	1:4	16-SOIC (0.154", 3.90mm)	Active
CD74HC7046AM	Harris Corporation	74HC	38MHz	2V ~ 6V	-55°C ~ 125°C	CMOS	CMOS	1:2	16-SOIC (0.154", 3.90mm)	Obsolete
CD74HC7046AM96	Texas Instruments	74HC	38MHz	2V ~ 6V	-55°C ~ 125°C	CMOS	CMOS	1:2	16-SOIC (0.154", 3.90mm)	Active
CD74HC7046AMT	Texas Instruments	74HC	38MHz	2V ~ 6V	-55°C ~ 125°C	CMOS	CMOS	1:2	16-SOIC (0.154", 3.90mm)	Active
CD74HC4046ANSR	Texas Instruments	74HC	38MHz	2V ~ 6V	-55°C ~ 125°C	CMOS	CMOS	1:4	16-SOIC (0.209", 5.30mm)	Active

Engineering Selection Recommendations

For applications currently using the obsolete MM74HC4046MX, the following selection criteria apply based on product status and compliance:

Preferred Active Alternatives: CD74HC4046AM, CD74HC4046AMT, and CD74HC7046AM96 are active products from Texas Instruments with ROHS3 compliance. These parts maintain the 2V–6V supply voltage range and CMOS input/output compatibility of the original, with extended operating temperature range (-55°C to 125°C) and significantly higher frequency capability (38MHz). The CD74HC7046AM96 and CD74HC7046AMT variants provide the same 1:2 input-to-output ratio as the MM74HC4046MX.

NXP Active Options: 74HC4046AD,653 is an active NXP product with 21MHz frequency capability and 3V–6V supply voltage range, suitable for applications not requiring the full 2V minimum specification.

Limited Frequency Applications: HEF4046BT,653 from Nexperia operates at 2.7MHz maximum frequency with an extended supply voltage range (3V–15V), appropriate for lower-frequency phase locking circuits.

Package Consideration: CD74HC4046ANSR uses a wider 16-SOIC package (0.209" width versus 0.154"), requiring PCB layout verification before substitution.

Obsolete Status: CD74HC7046AM (Harris Corporation) and 74HCT4046AD,118 (NXP) are not recommended for new designs despite active inventory status, as they present long-term supply risk or voltage specification constraints.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC4046AM directly replace the MM74HC4046MX?

A: Yes, the CD74HC4046AM is a direct functional replacement. Both use the 16-SOIC (0.154", 3.90mm) package, operate within the 2V–6V supply range, and feature CMOS input/output. The CD74HC4046AM provides superior performance with 38MHz frequency capability and extended temperature range (-55°C to 125°C).

Q: What is the difference between CD74HC4046AM and CD74HC7046AM96?

A: Both are Texas Instruments active products in the same package with identical electrical specifications. The primary difference is the input-to-output ratio: CD74HC4046AM provides 1:4 ratio, while CD74HC7046AM96 provides 1:2 ratio, matching the original MM74HC4046MX specification.

Q: Why is the 74HCT4046AD,118 not recommended as a direct substitute?

A: The 74HCT4046AD,118 has a narrower supply voltage range (4.5V–5.5V) compared to the MM74HC4046MX (2V–6V). This restriction makes it unsuitable for applications requiring operation below 4.5V.

Q: Does the CD74HC4046ANSR work as a substitute?

A: The CD74HC4046ANSR is functionally equivalent but uses a wider 16-SOIC package (0.209" versus 0.154" width). PCB layout and footprint compatibility must be verified before substitution.

Q: Are there compliance differences between substitute options?

A: Yes. CD74HC4046AM, CD74HC4046AMT, CD74HC7046AM96, and CD74HC7046AMT are ROHS3 compliant. CD74HC7046AM (Harris) is RoHS non-compliant. Compliance requirements should be verified against your application standards.

Q: Which substitute is best for new designs?

A: CD74HC4046AMT or CD74HC7046AMT from Texas Instruments are recommended for new designs. Both are active products with ROHS3 compliance, extended temperature range, and high frequency capability in tape-and-reel packaging suitable for production environments.

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