N74F27D,623 NOR Gate IC Equivalent & Substitute Parts

Part Overview

The N74F27D,623 is a 3-channel NOR gate logic IC manufactured by NXP USA Inc. in a 14-SO surface mount package. This component implements three independent 3-input NOR logic functions and operates within the 4.5V to 5.5V supply voltage range. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	3
Number of Inputs	3
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	1mA, 20mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	5ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Series	74F
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the N74F27D,623 are qualified based on matching the following critical parameters:

Logic type: NOR Gate with 3 channels and 3 inputs per channel
Electrical specifications: 4.5V ~ 5.5V supply voltage, 1mA/20mA output current, 0.8V/2V input logic levels, 5ns propagation delay at 5V with 50pF load
Operating temperature range: 0°C ~ 70°C
Mounting type: Surface Mount
Series classification: 74F
Compliance: ROHS3 Compliant, MSL 1

All identified substitutes maintain identical functional and electrical characteristics. Variations exist only in packaging format and product status.

Parameter Comparison

Parameter	N74F27D,623 (NXP)	SN74F27D (TI)	SN74F27NSR (TI)	SN74F27DR (TI)
Manufacturer	NXP USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	NOR Gate	NOR Gate	NOR Gate	NOR Gate
Number of Circuits	3	3	3	3
Number of Inputs	3	3	3	3
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Output High, Low	1mA, 20mA	1mA, 20mA	1mA, 20mA	1mA, 20mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	5ns @ 5V, 50pF	5ns @ 5V, 50pF	5ns @ 5V, 50pF	5ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Series	74F	74F	74F	74F
Product Status	Obsolete	Last Time Buy	Active	Active
Packaging	Not specified	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.209", 5.30mm Width)	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SN74F27DR (Texas Instruments) is the primary parametric equivalent. This part maintains identical electrical specifications and operates in the same temperature range. It carries Active product status and is available in Tape & Reel packaging with a 14-SOIC (0.154", 3.90mm Width) case format matching the original N74F27D,623 package dimensions. ROHS3 compliance and MSL 1 rating are maintained.

SN74F27NSR (Texas Instruments) is the manufacturer-recommended alternative. This part is classified as Active and supplied in Tape & Reel format. The package case is 14-SOIC (0.209", 5.30mm Width), which differs in width from the original. This dimension variation requires PCB layout verification before implementation.

SN74F27D (Texas Instruments) is a direct equivalent with Last Time Buy status. It is supplied in Tube packaging and maintains the 14-SOIC (0.154", 3.90mm Width) package dimensions. This option is suitable for applications where tube packaging is acceptable.

All three substitutes are ROHS3 compliant and carry MSL 1 ratings, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SN74F27DR be used as a direct replacement for N74F27D,623?

A: Yes. SN74F27DR matches all electrical parameters, operating temperature range, and package dimensions (14-SOIC 0.154" width). The part is Active status and suitable for new designs and ongoing production.

Q: What is the difference between SN74F27NSR and SN74F27DR?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is package width: SN74F27NSR uses 14-SOIC (0.209", 5.30mm Width), while SN74F27DR uses 14-SOIC (0.154", 3.90mm Width). PCB layout compatibility must be verified for SN74F27NSR before selection.

Q: Why is SN74F27D listed as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing production. This part remains available but in limited quantities. For new designs, SN74F27DR or SN74F27NSR (both Active status) are preferred.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All identified substitutes—SN74F27D, SN74F27NSR, and SN74F27DR—are ROHS3 compliant with MSL 1 rating, meeting standard environmental and handling requirements.

Q: Does packaging format affect electrical performance?

A: No. Tube, Tape & Reel, and other packaging formats do not alter electrical characteristics. Selection depends on assembly process requirements and inventory management practices.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided package dimensions are compatible with PCB layout. SN74F27DR and N74F27D,623 share identical 14-SOIC (0.154", 3.90mm Width) dimensions. SN74F27NSR requires layout verification due to its 14-SOIC (0.209", 5.30mm Width) case.

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