74VHC27MX NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74VHC27MX is a 3-channel NOR gate logic IC manufactured by onsemi in a 14-SOIC surface mount package. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The 74VHC27MX operates across a 2V to 5.5V supply voltage range and is suitable for general-purpose logic applications requiring NOR gate functionality with three independent channels.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	3
Number of Inputs	3
Voltage - Supply	2V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	8mA, 8mA
Input Logic Level - Low	0.5V
Input Logic Level - High	1.5V
Max Propagation Delay @ 5V, 50pF	7.9ns
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74VHC27MX is determined by strict equivalence across the following critical parameters:

Logic function: NOR gate with 3 channels and 3 inputs per channel
Package type: 14-SOIC surface mount form factor
Supply voltage range: 2V ~ 5.5V compatibility
Input/output logic levels: 0.5V low threshold, 1.5V high threshold
Propagation delay: 7.9ns maximum at 5V with 50pF load
Operating temperature range: -40°C ~ 85°C
Moisture sensitivity: MSL 1 (Unlimited)

The substitute parts SN74LV27AD and SN74LV27ADR, both manufactured by Texas Instruments, meet all functional and electrical requirements for direct substitution. Both parts maintain identical logic configuration, package dimensions, and critical timing specifications. Differences in quiescent current (20 µA vs. 2 µA) and output drive capability (12mA vs. 8mA) represent acceptable parameter variations within the 74LV series design envelope and do not preclude substitution in standard logic applications.

Parameter Comparison

Parameter	74VHC27MX (onsemi)	SN74LV27AD (TI)	SN74LV27ADR (TI)
Logic Type	NOR Gate	NOR Gate	NOR Gate
Number of Circuits	3	3	3
Number of Inputs	3	3	3
Voltage - Supply	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V
Current - Quiescent (Max)	2 µA	20 µA	20 µA
Current - Output High, Low	8mA, 8mA	12mA, 12mA	12mA, 12mA
Input Logic Level - Low	0.5V	0.5V	0.5V
Input Logic Level - High	1.5V	1.5V	1.5V
Max Propagation Delay @ 5V, 50pF	7.9ns	7.9ns	7.9ns
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Last Time Buy	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production applications, SN74LV27ADR is the preferred substitute. This part carries Active product status from Texas Instruments, ensuring long-term availability and supply chain stability. SN74LV27ADR is ROHS3 compliant and available in Tape & Reel packaging, supporting automated assembly processes with inventory of 2388 pieces in stock.

SN74LV27AD serves as a secondary substitute option. This part maintains Last Time Buy status, indicating limited future availability. It is also ROHS3 compliant and available in Tube packaging with 1663 pieces in stock.

Both Texas Instruments substitutes are functionally equivalent to the obsolete 74VHC27MX across all critical electrical and mechanical parameters. The increased quiescent current and output drive capability of the 74LV series represent design improvements that enhance performance in most standard logic applications without introducing compatibility issues.

Frequently Asked Questions (FAQ)

Q: Can SN74LV27AD and SN74LV27ADR be used interchangeably with 74VHC27MX?

A: Yes. Both parts are functionally equivalent across all critical parameters: logic function, package type, supply voltage range, input/output logic levels, propagation delay, and operating temperature range. The primary difference is packaging format (Tube vs. Tape & Reel) and product lifecycle status.

Q: What is the difference between SN74LV27AD and SN74LV27ADR?

A: Both parts are electrically identical. SN74LV27AD is supplied in Tube packaging and carries Last Time Buy status. SN74LV27ADR is supplied in Tape & Reel packaging and carries Active product status, making it the recommended choice for ongoing production.

Q: Are there any compatibility concerns with the increased quiescent current in the 74LV series?

A: No. The increase from 2 µA to 20 µA quiescent current is within acceptable design margins for standard logic applications. The 74LV series represents a later design generation with improved performance characteristics.

Q: Will the higher output drive capability (12mA vs. 8mA) affect circuit operation?

A: No. Higher output drive capability is a performance enhancement that does not introduce compatibility issues. Circuits designed for 8mA output will operate correctly with 12mA output capability.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both SN74LV27AD and SN74LV27ADR are ROHS3 compliant. The original 74VHC27MX RoHS status was not specified in the provided data.

Q: What is the MSL rating for these parts?

A: All three parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage and handling.

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