74VHC4046MTC Phase Lock Loop IC Equivalent & Substitute Parts

Part Overview

The 74VHC4046MTC is a Phase Lock Loop (PLL) integrated circuit manufactured by onsemi, housed in a 16-TSSOP surface mount package. This device operates at a maximum frequency of 14MHz with a 1:2 input-to-output ratio and supports a supply voltage range of 2V to 6V. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74VHC4046MTC
Manufacturer	onsemi
Type	Phase Lock Loop (PLL)
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Frequency - Max	14MHz
Ratio - Input:Output	1:2
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C
Input	CMOS
Output	3-State
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 74VHC4046MTC is determined by the following critical parameters: package type (16-TSSOP), mounting method (surface mount), input/output signal compatibility (CMOS logic levels), supply voltage range overlap, and operating temperature range. All substitute parts listed maintain the identical 16-TSSOP package footprint, ensuring mechanical and electrical compatibility at the board level.

The substitute parts are grouped into two categories:

Direct Substitutes (Texas Instruments 74LV Series): These parts maintain CMOS input compatibility and operate within overlapping voltage ranges (3V ~ 5.5V subset of the original 2V ~ 6V range). The 74LV4046 variants offer higher maximum frequency (38MHz) and extended temperature range (-40°C ~ 125°C), providing enhanced performance characteristics while maintaining functional equivalence.

Upgrade Alternatives (74HC and CD4046 Series): These parts provide functional PLL capability in the same package but with different electrical characteristics. The 74HC4046 series operates at 21MHz with a 2V ~ 6V supply range matching the original specification. The CD4046 series supports a wider supply voltage range (3V ~ 18V) and lower maximum frequency (2.4MHz), with divider capability not present in the original part.

Parameter Comparison

Parameter	74VHC4046MTC	SN74LV4046APW	SN74LV4046APWR	74HC4046APW,118	CD74HC4046APW	CD4046BPW
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Texas Instruments	Texas Instruments
Package / Case	16-TSSOP	16-TSSOP	16-TSSOP	16-TSSOP	16-TSSOP	16-TSSOP
Frequency - Max	14MHz	38MHz	38MHz	21MHz	38MHz	2.4MHz
Ratio - Input:Output	1:2	1:3	1:3	2:3	1:4	1:1
Voltage - Supply	2V ~ 6V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 6V	2V ~ 6V	3V ~ 18V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Input	CMOS	CMOS, TTL	CMOS, TTL	Clock	CMOS	CMOS
Output	3-State	CMOS, TTL	CMOS, TTL	Clock	CMOS	CMOS
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Enhanced Performance: The SN74LV4046APW and SN74LV4046APWR (Texas Instruments) are recommended as primary substitutes. Both parts maintain CMOS input compatibility and operate within a voltage range that overlaps with the original specification (3V ~ 5.5V is a subset of 2V ~ 6V). These parts are active products with ROHS3 compliance and extended operating temperature range (-40°C ~ 125°C). The higher maximum frequency (38MHz) provides performance headroom beyond the original 14MHz specification.

For Voltage Range Flexibility: The CD74HC4046APW and CD74HC4046APWT (Texas Instruments) maintain the original 2V ~ 6V supply voltage range and offer 38MHz maximum frequency. These parts are active products with ROHS3 compliance and extended temperature range. The 1:4 input-to-output ratio differs from the original 1:2 ratio, requiring circuit-level verification.

For Extended Supply Voltage Applications: The CD4046BPW and CD4046BPWR (Texas Instruments) support the widest supply voltage range (3V ~ 18V) and include divider capability. These parts are active products with ROHS3 compliance and extended temperature range (-55°C ~ 125°C). The lower maximum frequency (2.4MHz) and 1:1 input-to-output ratio represent significant functional differences requiring design review.

For Nexperia Supply Chain: The 74HC4046APW,118 (Nexperia USA Inc.) provides an alternative source with 21MHz maximum frequency and 3V ~ 6V supply range. This part is active with ROHS3 compliance and extended temperature range.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LV4046APWR as a direct drop-in replacement for 74VHC4046MTC?

A: The SN74LV4046APWR shares the identical 16-TSSOP package and maintains CMOS input/output compatibility. The supply voltage range (3V ~ 5.5V) is a subset of the original (2V ~ 6V), so designs operating at 3V or higher are compatible. The higher maximum frequency (38MHz vs. 14MHz) and extended temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C) provide enhanced specifications. Verify that your circuit does not require operation below 3V supply voltage.

Q: What is the difference between the 74LV and 74HC variants?

A: The 74LV series (SN74LV4046APW/APWR) operates at 3V ~ 5.5V with 38MHz maximum frequency and supports both CMOS and TTL input/output. The 74HC series (CD74HC4046APW/APWT, 74HC4046APW,118) operates at 2V ~ 6V or 3V ~ 6V with 21MHz or 38MHz maximum frequency and CMOS input/output. The 74LV series is optimized for lower voltage operation, while 74HC variants maintain broader voltage compatibility.

Q: Why does the CD4046BPW have a lower maximum frequency?

A: The CD4046BPW is a CMOS-based PLL designed for lower frequency applications (2.4MHz maximum) but offers the widest supply voltage range (3V ~ 18V) and includes divider functionality. This part is suitable for applications requiring extended voltage operation or divider capability, not for high-frequency clock generation matching the original 14MHz specification.

Q: Are all substitute parts RoHS compliant?

A: Yes, all listed substitute parts are ROHS3 compliant. The original 74VHC4046MTC RoHS status was not specified in the available data.

Q: What packaging options are available for the substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (standard packaging), Tape & Reel (TR) for automated assembly, and Cut Tape (CT) & Digi-Reel® for mixed-volume orders. All maintain the identical 16-TSSOP footprint. Select packaging based on your procurement volume and assembly process requirements.

Q: Can I use CD74HC4046APWR if my design requires operation at 2V supply voltage?

A: Yes, the CD74HC4046APWR supports 2V ~ 6V supply voltage range, matching the original specification. This part is suitable for low-voltage applications. The SN74LV4046APWR minimum supply voltage is 3V, making it unsuitable for 2V operation.

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