74VHC27SJ Equivalent & Substitute Parts

Part Overview

The 74VHC27SJ is a NOR Gate IC featuring 3 channels with 3 inputs per channel in a 14-SOP surface mount package, manufactured by onsemi. This logic component operates across a 2V to 5.5V supply voltage range and is designed for general-purpose digital logic applications. The product is currently listed as obsolete, making identification of compatible substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

74VHC27SJ

onsemiIn Stock: 118674VHC27SJ Datasheet

Current PartRFQ

SN74LV27ANSR

Texas InstrumentsIn Stock: 2935SN74LV27ANSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74VHC27SJ is determined by the following critical parameters:

• Logic Function: NOR Gate with 3 channels and 3 inputs per channel
• Supply Voltage Range: 2V ~ 5.5V compatibility
• Package Type: 14-SOIC surface mount package with 0.209" width (5.30mm)
• Propagation Delay: Maximum 7.9ns at 5V with 50pF load
• Operating Temperature Range: -40°C ~ 85°C
• Input/Output Logic Levels: Low 0.5V, High 1.5V

The SN74LV27ANSR from Texas Instruments meets all these substitution criteria, maintaining functional equivalence and pin compatibility within the specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

The SN74LV27ANSR is a direct functional substitute for the 74VHC27SJ. Both components share identical logic architecture, pin configuration, and core electrical specifications including supply voltage range, propagation delay, and operating temperature limits. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

Differences in quiescent current (20 µA vs. 2 µA) and output drive current (12mA vs. 8mA) are within acceptable operational margins for most applications. The SN74LV27ANSR carries ROHS3 compliance certification, meeting modern environmental and regulatory requirements. Both parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the SN74LV27ANSR directly replace the 74VHC27SJ without PCB modifications?

A: Yes. Both components use identical 14-SOIC packaging with matching pin assignments and electrical specifications. No PCB layout changes are required for direct substitution.

Q: What is the significance of the higher quiescent current in the SN74LV27ANSR?

A: The SN74LV27ANSR draws 20 µA maximum quiescent current compared to 2 µA for the 74VHC27SJ. This difference is negligible in most applications and does not affect functional compatibility. Power consumption impact is minimal in typical digital logic circuits.

Q: Are there any supply voltage compatibility concerns?

A: No. Both parts operate across the identical 2V to 5.5V supply voltage range with matching input and output logic levels (0.5V low, 1.5V high), ensuring full compatibility across all specified operating conditions.

Q: Why is the 74VHC27SJ listed as obsolete?

A: The 74VHC27SJ has reached end-of-life status with onsemi. The SN74LV27ANSR from Texas Instruments provides continued access to this logic function with active production support and modern compliance certifications.

Q: Does the higher output drive current of the SN74LV27ANSR affect circuit design?

A: The increased output drive current (12mA vs. 8mA) provides improved fanout capability and faster edge transitions. This is a beneficial characteristic that enhances performance in most applications without requiring design modifications.