SN74HC27ANS Equivalent & Substitute Parts

Part Overview

The SN74HC27ANS is a NOR Gate IC manufactured by Texas Instruments, featuring 3 channels with 3 inputs per channel in a 14-SO 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 SN74HC27ANS carries a Last Time Buy product status, indicating that this specific part number variant is no longer in active production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain component availability for new production runs and system updates.

Substiute Parts

SN74HC27ANS

Texas InstrumentsIn Stock: 894SN74HC27ANS Datasheet

Current PartRFQ

SN74HC27ANSR

Texas InstrumentsIn Stock: 2062SN74HC27ANSR Datasheet

Parametric EquivalentRFQ

SN74HC27NSR

Texas InstrumentsIn Stock: 2947SN74HC27NSR Datasheet

Parametric EquivalentRFQ

SN74HC27NS

Texas InstrumentsIn Stock: 3062SN74HC27NS Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC27ANS is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Logic Type: NOR Gate
• Number of Circuits: 3
• Number of Inputs: 3 per circuit

Electrical Parameters:

• 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 @ 6V, 50pF: 15ns
• Operating Temperature: -40°C ~ 85°C

Physical Parameters:

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

Compliance Parameters:

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

All substitute parts listed below maintain identical electrical and functional specifications. Differences exist only in packaging format (Tape & Reel vs. Bulk) and product status (Active vs. Last Time Buy).

Parameter Comparison

Engineering Selection Recommendations

SN74HC27ANSR is the primary substitute for SN74HC27ANS. Both parts share identical electrical and functional specifications with equivalent packaging. The SN74HC27ANSR maintains Active product status, ensuring long-term availability and supply chain stability. This part is recommended for new designs and production runs requiring the same performance characteristics as the original SN74HC27ANS.

SN74HC27NSR provides an alternative substitute with identical electrical performance and specifications. This part is supplied in Tape & Reel packaging format, suitable for automated assembly processes. The SN74HC27NSR carries Active product status and is available in higher inventory quantities, making it suitable for high-volume production applications.

SN74HC27NS serves as a third substitute option, supplied in Bulk packaging format. This part maintains identical electrical and functional specifications and carries Active product status. The SN74HC27NS is available in the highest inventory quantity among all substitutes, providing maximum availability for component procurement.

All three substitute parts are ROHS3 compliant and carry MSL rating of 1 (Unlimited), matching the compliance profile of the original SN74HC27ANS. Selection between these substitutes should be based on packaging requirements (Tape & Reel vs. Bulk) and supply chain logistics rather than electrical performance, as all parts are functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can SN74HC27ANSR be used as a direct replacement for SN74HC27ANS?

A: Yes. The SN74HC27ANSR is a direct parametric equivalent. All electrical specifications, logic functionality, operating temperature range, and package dimensions are identical. The primary difference is product status: SN74HC27ANSR is Active while SN74HC27ANS is Last Time Buy.

Q: What is the difference between SN74HC27NSR and SN74HC27NS?

A: Both parts are electrically and functionally identical. The difference lies in packaging format: SN74HC27NSR is supplied in Tape & Reel format for automated assembly, while SN74HC27NS is supplied in Bulk format. Selection depends on assembly process requirements.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the 14-SOIC package with identical dimensions (0.209" width, 5.30mm). PCB footprints designed for SN74HC27ANS are compatible with all listed substitutes without modification.

Q: Do the substitute parts meet the same compliance standards as SN74HC27ANS?

A: SN74HC27ANSR and SN74HC27NSR maintain identical ROHS3 compliance and MSL rating of 1 (Unlimited). SN74HC27NS compliance specifications are not fully documented in the provided data.

Q: Which substitute should be selected for new production designs?

A: SN74HC27ANSR is recommended for new designs due to its Active product status and documented compliance certifications. For high-volume automated assembly, SN74HC27NSR in Tape & Reel format is preferred. For bulk procurement applications, SN74HC27NS offers maximum inventory availability.

Q: Are there any electrical performance differences between the substitutes?

A: No. All substitute parts maintain identical electrical specifications including supply voltage range (2V ~ 6V), quiescent current (2 µA max), output current (5.2mA), propagation delay (15ns @ 6V, 50pF), and operating temperature range (-40°C ~ 85°C).

Q: What is the significance of the Last Time Buy status for SN74HC27ANS?

A: Last Time Buy status indicates that Texas Instruments will no longer manufacture this specific part number variant. Existing inventory may be depleted, and future availability cannot be guaranteed. Transitioning to an Active substitute part ensures long-term design support and component availability.