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74HCT4020N,652 Equivalent & Substitute Parts
Part Overview
The 74HCT4020N,652 is a 14-bit binary counter IC manufactured by NXP USA Inc., designed for digital logic applications requiring asynchronous reset and negative edge triggering. This component operates across a supply voltage range of 4.5 V to 5.5 V with a maximum count rate of 47 MHz and is housed in a 16-DIP through-hole package. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations where legacy compatibility is required.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74HCT4020N,652 |
| Manufacturer | NXP USA Inc. |
| Logic Type | Binary Counter |
| Number of Bits per Element | 14 Bit |
| Direction | Up |
| Reset | Asynchronous |
| Trigger Type | Negative Edge |
| Count Rate | 47 MHz |
| Voltage - Supply | 4.5 V ~ 5.5 V |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 16-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the 74HCT4020N,652 is determined by strict equivalence across the following critical parameters:
- Logic function: Binary counter with 14-bit capacity
- Counter direction: Up counting only
- Reset mechanism: Asynchronous reset capability
- Trigger mechanism: Negative edge triggering
- Supply voltage range: 4.5 V to 5.5 V compatibility
- Package form factor: 16-DIP through-hole configuration
- Pin count and pinout: 16-pin DIP standard
The CD74HCT4020E qualifies as a manufacturer-recommended substitute based on identical logic function, reset type, trigger type, supply voltage range, and package configuration. Both parts implement the 74HCT4020 base product architecture and maintain functional pin compatibility within the 16-DIP package standard.
Parameter Comparison
| Parameter | 74HCT4020N,652 (NXP) | CD74HCT4020E (Harris) |
|---|---|---|
| Logic Type | Binary Counter | Binary Counter |
| Number of Bits per Element | 14 Bit | 14 Bit |
| Direction | Up | Up |
| Number of Elements | 1 | 1 |
| Reset | Asynchronous | Asynchronous |
| Trigger Type | Negative Edge | Negative Edge |
| Voltage - Supply | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V |
| Package / Case | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole | Through Hole |
| Count Rate | 47 MHz | 25 MHz |
| Operating Temperature | -40°C ~ 125°C | -55°C ~ 125°C |
| Product Status | Obsolete | Obsolete |
| RoHS Status | ROHS3 Compliant | RoHS non-compliant |
Engineering Selection Recommendations
The CD74HCT4020E serves as a functional equivalent for the 74HCT4020N,652 in applications where the core counter logic, package form factor, and supply voltage requirements are the primary selection criteria. Both parts are classified as obsolete products.
When selecting between these parts, consider the following compliance and performance factors:
The 74HCT4020N,652 maintains ROHS3 compliance, making it suitable for applications subject to RoHS regulatory requirements. The CD74HCT4020E is RoHS non-compliant and should be evaluated against applicable environmental and regulatory standards for the target application.
The 74HCT4020N,652 specifies a maximum count rate of 47 MHz, while the CD74HCT4020E is rated for 25 MHz. Applications requiring operation at frequencies above 25 MHz should retain the NXP part. The CD74HCT4020E supports an extended lower operating temperature limit of -55°C compared to -40°C for the NXP part, providing broader temperature range coverage for specialized applications.
Frequently Asked Questions (FAQ)
Q: Are the 74HCT4020N,652 and CD74HCT4020E pin-compatible?
A: Yes. Both parts are housed in 16-DIP packages with identical pinout configurations. Direct socket substitution is possible without PCB modification.
Q: What is the primary difference between these two parts?
A: The maximum count rate differs: the 74HCT4020N,652 operates at 47 MHz while the CD74HCT4020E is rated for 25 MHz. Additionally, the NXP part is ROHS3 compliant while the Harris part is not.
Q: Can the CD74HCT4020E replace the 74HCT4020N,652 in all applications?
A: Substitution is valid for applications operating at clock frequencies of 25 MHz or below. Applications requiring higher frequency operation must use the 74HCT4020N,652. RoHS compliance requirements must also be evaluated for the target application.
Q: What does "asynchronous reset" mean for these counter ICs?
A: Asynchronous reset allows the counter to be cleared to zero independent of the clock signal. The reset operation occurs immediately when the reset input is activated, without waiting for a clock edge.
Q: Are both parts still in production?
A: No. Both the 74HCT4020N,652 and CD74HCT4020E are classified as obsolete products. Inventory availability should be verified with authorized distributors before design implementation.
Q: What does "negative edge triggering" mean?
A: The counter increments on the falling edge (transition from high to low) of the input clock signal, not on the rising edge.
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