SN74HC27ADB Equivalent & Substitute Parts

Part Overview

The SN74HC27ADB is a NOR Gate IC manufactured by Texas Instruments, featuring 3 channels with 3 inputs per channel in a 14-SSOP surface mount package. This logic component operates across a 2V to 6V supply voltage range and is designed for digital logic applications requiring NOR gate functionality. The part maintains Active product status and is RoHS3 compliant. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable, while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	3
Number of Inputs	3
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	5.2mA, 5.2mA
Input Logic Level - Low	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V
Max Propagation Delay @ V, Max CL	15ns @ 6V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74HC27ADB are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution criteria are:

Electrical Parameters (Must Match Exactly):

Logic Type: NOR Gate
Number of Circuits: 3
Number of Inputs: 3
Voltage - Supply: 2V ~ 6V
Current - Quiescent (Max): 2 µA
Current - Output High, Low: 5.2mA, 5.2mA
Input Logic Level - Low: 0.5V ~ 1.8V
Input Logic Level - High: 1.5V ~ 4.2V
Max Propagation Delay @ V, Max CL: 15ns @ 6V, 50pF
Operating Temperature: -40°C ~ 85°C

Mechanical Parameters (Must Match Exactly):

Mounting Type: Surface Mount
Package / Case: 14-SSOP (0.209", 5.30mm Width)

Compliance Parameters (Must Match Exactly):

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts may differ only in packaging format (tape & reel versus tube) and inventory availability, as these factors do not affect functional or mechanical compatibility in circuit applications.

Parameter Comparison

Parameter	SN74HC27ADB	SN74HC27DBR
Manufacturer	Texas Instruments	Texas Instruments
Series	74HC	74HC
Logic Type	NOR Gate	NOR Gate
Number of Circuits	3	3
Number of Inputs	3	3
Voltage - Supply	2V ~ 6V	2V ~ 6V
Current - Quiescent (Max)	2 µA	2 µA
Current - Output High, Low	5.2mA, 5.2mA	5.2mA, 5.2mA
Input Logic Level - Low	0.5V ~ 1.8V	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V	1.5V ~ 4.2V
Max Propagation Delay @ V, Max CL	15ns @ 6V, 50pF	15ns @ 6V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	14-SSOP (0.209", 5.30mm Width)	14-SSOP (0.209", 5.30mm Width)
Packaging Format	Tube	Tape & Reel (TR)
Product Status	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both the SN74HC27ADB and SN74HC27DBR are Active status products manufactured by Texas Instruments with identical electrical and mechanical specifications. Selection between these parts is determined by packaging and supply requirements:

SN74HC27ADB is supplied in tube packaging format and is appropriate for applications requiring smaller order quantities or manual component handling.

SN74HC27DBR is supplied in tape & reel (TR) format and is appropriate for high-volume production environments utilizing automated pick-and-place assembly equipment.

Both parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, confirming suitability for standard manufacturing and storage conditions. The identical electrical performance across all specified parameters ensures direct functional interchangeability in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can SN74HC27DBR be used as a direct replacement for SN74HC27ADB?

A: Yes. Both parts are electrically and mechanically identical. The only difference is packaging format: SN74HC27ADB uses tube packaging while SN74HC27DBR uses tape & reel format. Circuit performance and pin configuration are identical.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging supplies components in plastic tubes suitable for manual handling and smaller quantities. Tape & reel packaging supplies components on continuous carrier tape wound on reels, designed for automated assembly equipment. Both formats contain the same component with identical specifications.

Q: Are both parts RoHS compliant?

A: Yes. Both SN74HC27ADB and SN74HC27DBR are ROHS3 compliant and suitable for applications requiring RoHS certification.

Q: What is the moisture sensitivity level for these parts?

A: Both parts have MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard storage and handling procedures are sufficient.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes, provided the assembly process accommodates the packaging format. SN74HC27ADB (tube) requires manual placement or tube-compatible feeders. SN74HC27DBR (tape & reel) integrates directly with standard automated pick-and-place systems.

Q: What is the operating temperature range?

A: Both parts operate from -40°C to 85°C, covering industrial and commercial temperature ranges.

Q: Are there any differences in electrical performance between these parts?

A: No. Both parts have identical electrical specifications including supply voltage (2V ~ 6V), propagation delay (15ns @ 6V, 50pF), output current (5.2mA), and all logic thresholds.

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