74AC20PC NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74AC20PC is a dual 4-input NAND gate logic IC manufactured by onsemi, housed in a 14-pin DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74AC20PC operates across a 2V to 6V supply voltage range and is suitable for through-hole mounting applications requiring standard TTL-compatible logic switching.

Substiute Parts

74AC20PC

onsemiIn Stock: 508774AC20PC Datasheet

Current PartRFQ

CD74AC20E

Harris CorporationIn Stock: 29719CD74AC20E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC20PC is determined by the following critical parameters:

• Logic Function: Dual 4-input NAND gate configuration
• Package Type: 14-pin DIP form factor with 0.300" (7.62mm) pitch
• Mounting Method: Through-hole compatibility
• Output Drive Capability: 24mA output current (high and low)
• Supply Voltage Range: Minimum 2V operation required
• Quiescent Current: Maximum 2 µA specification

The CD74AC20E from Harris Corporation meets these core substitution criteria. Both parts share identical logic architecture, pin configuration, and mechanical package specifications. The substitute maintains functional equivalence for standard NAND gate applications while offering extended operating temperature range and improved supply voltage tolerance.

Parameter Comparison

Engineering Selection Recommendations

Both the 74AC20PC and CD74AC20E are classified as obsolete products. Selection between these parts should be based on the following factors:

Supply Voltage Compatibility: The CD74AC20E operates at 1.5V minimum, providing broader voltage range support compared to the 74AC20PC's 2V minimum. Applications requiring operation below 2V must use the CD74AC20E.

Temperature Range: The CD74AC20E extends operation to -55°C and 125°C, versus the 74AC20PC's -40°C to 85°C range. Systems requiring extended temperature performance should specify the CD74AC20E.

Propagation Delay: The 74AC20PC exhibits 7ns propagation delay at 5V with 50pF load, while the CD74AC20E specifies 12.2ns. Timing-critical applications may require the faster 74AC20PC if available.

Quiescent Current: The 74AC20PC draws 2 µA maximum quiescent current versus 4 µA for the CD74AC20E. Low-power applications should prioritize the 74AC20PC specification.

Compliance Status: The CD74AC20E is marked as RoHS non-compliant. Applications subject to RoHS requirements should verify compliance status before selection.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC20E directly replace the 74AC20PC in existing designs?

A: Yes, for most applications. Both parts share identical pin configuration, logic function, and 14-DIP package format. However, verify that your application does not depend on the 74AC20PC's faster 7ns propagation delay or lower 2 µA quiescent current specification.

Q: What is the primary difference between these two parts?

A: The CD74AC20E offers extended operating temperature range (-55°C to 125°C versus -40°C to 85°C) and broader supply voltage tolerance (1.5V to 5.5V versus 2V to 6V). The 74AC20PC provides faster propagation delay (7ns versus 12.2ns) and lower quiescent current (2 µA versus 4 µA).

Q: Are both parts suitable for new designs?

A: Both parts are classified as obsolete. For new designs, consider evaluating current-generation NAND gate logic ICs from active product lines to ensure long-term availability and support.

Q: Does package compatibility guarantee functional substitution?

A: Package compatibility is necessary but not sufficient. Functional substitution requires matching logic type, circuit count, input configuration, and electrical specifications. Both parts meet these criteria for standard NAND gate applications.

Q: What compliance certifications apply to these parts?

A: Both parts carry ECCN EAR99 classification and HTSUS code 8542.39.0001. The 74AC20PC has REACH Unaffected status with MSL 1 (Unlimited). The CD74AC20E is RoHS non-compliant. Verify compliance requirements for your specific application and region.