74AC14PC Equivalent & Substitute Parts

Part Overview

The 74AC14PC is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in a 14-MDIP package. This component functions as a logic inverter with hysteresis characteristics, designed for digital signal conditioning and logic level conversion applications. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system support and new designs requiring this functional specification.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	6
Features	Schmitt Trigger
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	24mA, 24mA
Max Propagation Delay @ 5V, 50pF	10ns
Operating Temperature	-40°C ~ 85°C
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the 74AC14PC is determined by functional equivalence within the 74AC logic family. The critical parameters for substitution are:

Logic configuration: 6-channel inverter with Schmitt trigger
Electrical performance: Supply voltage range, quiescent current, output drive capability, and propagation delay
Package compatibility: 14-DIP through-hole mounting
Series consistency: 74AC base product number

Two substitute parts meet these criteria:

CD74AC14E (Texas Instruments) - Functional equivalent with extended supply voltage range (1.5V ~ 5.5V) and wider operating temperature (-55°C ~ 125°C). Quiescent current specification is higher at 4 µA maximum.

SN74AC14N (Texas Instruments) - Parametric equivalent with identical electrical specifications to the 74AC14PC, including supply voltage range (2V ~ 6V), quiescent current (2 µA), and propagation delay (10ns @ 5V, 50pF).

Parameter Comparison

Parameter	74AC14PC (onsemi)	CD74AC14E (TI)	SN74AC14N (TI)
Logic Type	Inverter	Inverter	Inverter
Number of Circuits	6	6	6
Number of Inputs	6	6	6
Features	Schmitt Trigger	Schmitt Trigger	Schmitt Trigger
Voltage - Supply	2V ~ 6V	1.5V ~ 5.5V	2V ~ 6V
Current - Quiescent (Max)	2 µA	4 µA	2 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA
Input Logic Level - Low	0.5V ~ 1.1V	1.6V	0.5V ~ 1.1V
Input Logic Level - High	2.2V ~ 3.9V	3.4V	2.2V ~ 3.9V
Max Propagation Delay @ 5V, 50pF	10ns	10.5ns	10ns
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74AC14N is the primary substitute for direct replacement of the 74AC14PC. This part maintains identical electrical specifications including supply voltage range (2V ~ 6V), quiescent current (2 µA maximum), and propagation delay (10ns @ 5V, 50pF). The SN74AC14N is manufactured by Texas Instruments with active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

CD74AC14E serves as an alternative substitute when extended operating temperature range (-55°C ~ 125°C) or lower minimum supply voltage (1.5V) is required. This part exhibits slightly higher quiescent current (4 µA) and propagation delay (10.5ns), with different input logic level specifications. CD74AC14E is also ROHS3 compliant and actively manufactured.

Both substitutes are available in identical 14-DIP through-hole packaging, enabling direct socket replacement without PCB modification.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC14E replace the 74AC14PC in all applications?

A: CD74AC14E is functionally compatible but exhibits different electrical characteristics. The higher quiescent current (4 µA vs. 2 µA) and propagation delay (10.5ns vs. 10ns) may impact power consumption and timing-critical circuits. The extended operating temperature range and lower minimum supply voltage provide additional capability for some applications.

Q: Is the SN74AC14N a direct pin-for-pin replacement?

A: Yes. The SN74AC14N maintains identical pin configuration, package dimensions (14-DIP, 0.300" spacing), and electrical specifications as the 74AC14PC, enabling direct socket replacement.

Q: What are the key differences in input logic levels between these parts?

A: The 74AC14PC and SN74AC14N specify input logic levels as ranges: Low 0.5V ~ 1.1V, High 2.2V ~ 3.9V. The CD74AC14E specifies fixed thresholds: Low 1.6V, High 3.4V. This difference affects noise margin and signal conditioning performance in specific circuit topologies.

Q: Are both substitutes RoHS compliant?

A: Yes. Both CD74AC14E and SN74AC14N are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components.

Q: Which substitute should be selected for new designs?

A: SN74AC14N is recommended for new designs requiring direct electrical equivalence to the 74AC14PC specification. CD74AC14E is suitable when extended temperature range or lower minimum supply voltage provides system-level advantages.

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