74LVC27D,112 NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74LVC27D,112 is a NOR Gate IC featuring 3 channels with 3 inputs per channel in a 14-SO surface mount package, manufactured by NXP Semiconductors. This device is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The 74LVC series operates across a 1.2V to 3.6V supply voltage range with low quiescent current consumption, suitable for low-power logic applications requiring fast propagation delays.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	3
Number of Inputs	3
Voltage - Supply	1.2V ~ 3.6V
Current - Quiescent (Max)	40 µA
Current - Output High, Low	24mA, 24mA
Max Propagation Delay @ V, Max CL	2.4ns @ 3.3V, 50pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 74LVC27D,112 is determined by the following critical parameters:

Logic Function: NOR Gate with identical 3 channels and 3 inputs per channel
Package Compatibility: 14-SOIC form factor with matching 0.154" width and 3.90mm dimensions
Supply Voltage Range: Must accommodate the operating voltage requirements of the target application
Output Drive Capability: Current sourcing and sinking capacity for connected logic loads
Propagation Delay: Maximum delay specification for timing-critical signal paths
Temperature Range: -40°C to 85°C operational envelope
Compliance: ROHS3 compliance and moisture sensitivity level (MSL 1)

The SN74LV27AD from Texas Instruments satisfies these substitution criteria while operating within an extended 2V to 5.5V supply voltage range, making it suitable for applications where the 74LVC27D,112 is no longer available.

Parameter Comparison

Parameter	74LVC27D,112 (NXP)	SN74LV27AD (Texas Instruments)
Logic Type	NOR Gate	NOR Gate
Number of Circuits	3	3
Number of Inputs	3	3
Voltage - Supply	1.2V ~ 3.6V	2V ~ 5.5V
Current - Quiescent (Max)	40 µA	20 µA
Current - Output High, Low	24mA, 24mA	12mA, 12mA
Input Logic Level - Low	0.7V ~ 0.8V	0.5V
Input Logic Level - High	1.7V ~ 2V	1.5V
Max Propagation Delay @ V, Max CL	2.4ns @ 3.3V, 50pF	7.9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The SN74LV27AD qualifies as a direct functional substitute for the 74LVC27D,112 based on matching logic architecture, identical package geometry, and compatible operating temperature range. Both devices maintain ROHS3 compliance and MSL 1 moisture sensitivity classification.

Key considerations for selection:

The SN74LV27AD operates across a wider supply voltage range (2V to 5.5V) compared to the 74LVC27D,112 (1.2V to 3.6V), providing greater flexibility in mixed-voltage system designs. The Texas Instruments device exhibits lower quiescent current (20 µA versus 40 µA) and reduced output drive capability (12mA versus 24mA), which may be advantageous in power-constrained applications but requires verification of load requirements.

Propagation delay differs between devices: the 74LVC27D,112 specifies 2.4ns at 3.3V while the SN74LV27AD specifies 7.9ns at 5V. Applications with stringent timing requirements must account for this performance differential.

The 74LVC27D,112 carries Obsolete product status, while the SN74LV27AD is designated Last Time Buy, indicating limited future availability for both devices. Procurement planning should reflect these lifecycle positions.

Frequently Asked Questions (FAQ)

Q: Can the SN74LV27AD directly replace the 74LVC27D,112 in existing designs?

A: Yes, the SN74LV27AD provides functional equivalence for NOR gate logic operations with identical pin configuration and 14-SOIC package dimensions. However, design verification is required to confirm compatibility with application-specific voltage supply ranges, output current requirements, and timing constraints.

Q: What are the primary differences between these two devices?

A: The devices differ in supply voltage operating range, quiescent current consumption, output drive capability, and propagation delay specifications. The SN74LV27AD operates at higher supply voltages (up to 5.5V) with lower power consumption but slower switching speed compared to the 74LVC27D,112.

Q: Are both devices available in the same package?

A: Yes, both the 74LVC27D,112 and SN74LV27AD are packaged in 14-SOIC (0.154" width, 3.90mm) surface mount configuration, ensuring mechanical compatibility on printed circuit boards.

Q: Do these devices have identical input and output logic levels?

A: No, input logic level thresholds differ between devices. The 74LVC27D,112 specifies input low at 0.7V to 0.8V and input high at 1.7V to 2V, while the SN74LV27AD specifies input low at 0.5V and input high at 1.5V. System designs must account for these threshold variations when interfacing with other logic families.

Q: What is the significance of the product status designations?

A: The 74LVC27D,112 is classified as Obsolete, indicating discontinued production and limited availability. The SN74LV27AD is designated Last Time Buy, signifying a final production window before discontinuation. Both statuses necessitate long-term component procurement planning and design transition strategies.

Q: Are both devices RoHS compliant?

A: Yes, both the 74LVC27D,112 and SN74LV27AD maintain ROHS3 compliance and carry MSL 1 (Unlimited) moisture sensitivity classification, meeting environmental and reliability standards for industrial and commercial applications.

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