SN74HC14D Equivalent & Substitute Parts

Part Overview

The SN74HC14D is a 6-channel inverter IC with Schmitt trigger inputs manufactured by Texas Instruments in 14-SOIC surface mount packaging. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The SN74HC14D operates across a 2V to 6V supply voltage range with Schmitt trigger functionality for noise immunity in digital logic applications.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Schmitt Trigger
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	5.2mA, 5.2mA
Input Logic Level - Low	0.3V ~ 1.2V
Input Logic Level - High	1.5V ~ 4.2V
Max Propagation Delay @ 6V, 50pF	21ns
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74HC14D is determined by strict equivalence across the following critical parameters: logic type (inverter), circuit count (6 channels), input count (1 per channel), Schmitt trigger feature, supply voltage range (2V ~ 6V), output current capability (5.2mA), input logic levels, and 14-SOIC package compatibility. Parts are grouped into three categories based on substitution relationship:

Direct Substitutes maintain identical electrical specifications and packaging, differing only in distribution format (Cut Tape vs. Tube).

Parametric Equivalents meet all functional requirements with identical or superior electrical performance but may have different product status or inventory availability.

Upgrades provide enhanced performance (lower quiescent current, faster propagation delay, extended temperature range) while maintaining full backward compatibility and the same package footprint.

Parameter Comparison

Part Number	Manufacturer	Quiescent Current (Max)	Propagation Delay @ 6V, 50pF	Operating Temperature	Packaging	Product Status
SN74HC14D	Texas Instruments	2 µA	21ns	-40°C ~ 85°C	Tube	Discontinued at DiGi Electronics
SN74HC14DR	Texas Instruments	2 µA	21ns	-40°C ~ 85°C	Cut Tape & Digi-Reel	Active
SN74HC14DE4	Texas Instruments	2 µA	21ns	-40°C ~ 85°C	Tube	Discontinued at DiGi Electronics
SN74HC14DG4	Texas Instruments	2 µA	21ns	-40°C ~ 85°C	Tube	Active
MC74HC14ADR2G	onsemi	1 µA	13ns	-55°C ~ 125°C	Cut Tape & Digi-Reel	Active
74HC14D,653	Nexperia USA Inc.	2 µA	21ns	-40°C ~ 125°C	Cut Tape & Digi-Reel	Active
MM74HC14M	onsemi	2 µA	21ns	-55°C ~ 125°C	Tube	Active
MM74HC14MX	onsemi	2 µA	21ns	-55°C ~ 125°C	Cut Tape & Digi-Reel	Active
74HC14S14-13	Diodes Incorporated	20 µA	21ns	-40°C ~ 125°C	Tape & Reel	Active
M74HC14YRM13TR	STMicroelectronics	1 µA	21ns	-40°C ~ 125°C	Cut Tape & Digi-Reel	Active
MC74HC14ADG	onsemi	1 µA	13ns	-55°C ~ 125°C	Tube	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): SN74HC14DR is the primary choice, offering active product status from Texas Instruments with identical electrical performance to the SN74HC14D. This part is available in Cut Tape & Digi-Reel format for high-volume procurement.

For Active Inventory with Extended Temperature Range: MM74HC14MX (onsemi) or 74HC14D,653 (Nexperia) provide extended operating temperature to -55°C or -40°C to 125°C respectively, while maintaining the same quiescent current and propagation delay specifications. Both are actively produced and widely available.

For Enhanced Performance: MC74HC14ADR2G or MC74HC14ADG (onsemi) deliver superior performance with 1 µA quiescent current (50% reduction) and 13ns propagation delay (38% improvement), extended temperature range to -55°C to 125°C, and active product status. These are suitable for power-sensitive or high-speed applications requiring the same functional footprint.

For Automotive Applications: M74HC14YRM13TR (STMicroelectronics) is AEC-Q100 qualified with automotive-grade certification, 1 µA quiescent current, and -40°C to 125°C operating range.

Not Recommended: 74HC14S14-13 (Diodes Incorporated) exhibits 20 µA quiescent current, which is 10 times higher than the original specification and unsuitable for power-constrained designs.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC14DR as a direct replacement for SN74HC14D? A: Yes. SN74HC14DR is electrically identical to SN74HC14D with the same supply voltage (2V ~ 6V), quiescent current (2 µA max), propagation delay (21ns @ 6V, 50pF), and 14-SOIC package. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube). Both are surface mount compatible.

Q: What is the difference between the Texas Instruments and onsemi versions? A: Texas Instruments SN74HC14 series (SN74HC14D, SN74HC14DR, SN74HC14DE4, SN74HC14DG4) maintain the original 2 µA quiescent current and 21ns propagation delay specifications. onsemi MC74HC14ADR2G and MC74HC14ADG variants offer improved performance with 1 µA quiescent current and 13ns propagation delay, plus extended temperature range to -55°C to 125°C.

Q: Is the 14-SOIC package compatible across all substitutes? A: Yes. All listed substitutes use 14-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring PCB footprint compatibility. Packaging format (Tube, Cut Tape, Tape & Reel) affects distribution and handling but not electrical or mechanical compatibility.

Q: Can I use MC74HC14ADR2G in a design originally specified for SN74HC14D? A: Yes. MC74HC14ADR2G is a full upgrade with superior specifications: lower quiescent current (1 µA vs. 2 µA), faster propagation delay (13ns vs. 21ns), and extended temperature range (-55°C to 125°C vs. -40°C to 85°C). All functional parameters remain compatible.

Q: Why is 74HC14S14-13 not recommended? A: The 74HC14S14-13 has 20 µA quiescent current, which exceeds the original SN74HC14D specification (2 µA max) by a factor of 10. This makes it unsuitable for power-sensitive applications and represents a significant performance degradation.

Q: What is the difference between Schmitt trigger and standard inverter inputs? A: Schmitt trigger inputs provide hysteresis, creating separate thresholds for rising and falling edges. This improves noise immunity in noisy environments. All listed substitutes retain the Schmitt trigger feature, maintaining this functional advantage.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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