74HC27D,652 NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74HC27D,652 is a 3-channel NOR gate logic IC manufactured by Nexperia USA Inc., housed in a 14-SOIC surface mount package. This component implements three independent 3-input NOR gates in a single integrated circuit. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support, legacy system maintenance, and component sourcing.

Substiute Parts

74HC27D,652

Nexperia USA Inc.In Stock: 63974HC27D,652 Datasheet

Current PartRFQ

CD74HC27M

Harris CorporationIn Stock: 22293CD74HC27M Datasheet

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CD74HC27M96

Texas InstrumentsIn Stock: 2233CD74HC27M96 Datasheet

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CD74HC27MT

Texas InstrumentsIn Stock: 1250CD74HC27MT Datasheet

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SN74HC27D

Texas InstrumentsIn Stock: 1145SN74HC27D Datasheet

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SN74HC27DR

Texas InstrumentsIn Stock: 5037SN74HC27DR Datasheet

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SN74HC27DT

Texas InstrumentsIn Stock: 8390SN74HC27DT Datasheet

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SN74HC27NSR

Texas InstrumentsIn Stock: 2947SN74HC27NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74HC27D,652 is determined by strict equivalence across the following critical parameters:

• Logic function: 3-channel, 3-input NOR gate
• Electrical specifications: Supply voltage (2V–6V), quiescent current (2 µA max), output current (5.2mA), input logic levels, and propagation delay
• Package compatibility: 14-SOIC surface mount form factor with 0.154" (3.90mm) width
• Functional pin configuration: Identical pinout within the 74HC27 base product family

All substitute parts listed maintain these core electrical and mechanical parameters. Variations in product status, compliance certifications, and packaging formats (tube, tape & reel, cut tape) do not affect functional interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring the 74HC27D,652, the following selection criteria apply based on product status and compliance:

Primary Recommendation (Active Status & Full Compliance):

• SN74HC27DR (Texas Instruments): Active product status with ROHS3 compliance, 15ns propagation delay, operating range -40°C to 85°C, available in cut tape and Digi-Reel packaging.
• CD74HC27M96 (Texas Instruments): Active product status with ROHS3 compliance, 16ns propagation delay, extended operating range -55°C to 125°C, available in tape & reel packaging.

Secondary Options (Active Status):

• SN74HC27NSR (Texas Instruments): Active product status with ROHS3 compliance, 15ns propagation delay. Note: Package width is 5.30mm (14-SO) versus the standard 3.90mm (14-SOIC), requiring PCB layout verification for mechanical fit.

Legacy/Discontinued Alternatives (ROHS3 Compliant):

• SN74HC27D, SN74HC27DT, CD74HC27MT: All discontinued at DiGi Electronics but available in inventory. These maintain electrical equivalence and ROHS3 compliance.

Non-Compliant Alternative:

• CD74HC27M (Harris Corporation): RoHS non-compliant. Use only in applications where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can I substitute SN74HC27DR for the 74HC27D,652 without circuit modification?

A: Yes. Both parts share identical logic function (3-channel, 3-input NOR gate), electrical specifications (2V–6V supply, 2 µA quiescent current, 5.2mA output current), and 14-SOIC package footprint. The 15ns propagation delay is equivalent. No circuit changes are required.

Q: What is the difference between CD74HC27M96 and SN74HC27DR?

A: Both are functionally equivalent NOR gate ICs. CD74HC27M96 has a 1ns longer propagation delay (16ns vs. 15ns) and an extended operating temperature range (-55°C to 125°C vs. -40°C to 85°C). CD74HC27M96 is available in tape & reel packaging; SN74HC27DR is available in cut tape and Digi-Reel formats. Select based on temperature requirements and packaging needs.

Q: Why is SN74HC27NSR listed with a different package width (5.30mm)?

A: SN74HC27NSR uses a 14-SO package (5.30mm width) instead of the standard 14-SOIC (3.90mm width). While electrically equivalent, the larger package width may not fit existing PCB footprints designed for the narrower 3.90mm package. Verify PCB layout compatibility before substitution.

Q: Is CD74HC27M suitable for new designs?

A: CD74HC27M is RoHS non-compliant and obsolete. It is not recommended for new designs. Use SN74HC27DR or CD74HC27M96 instead, both of which are ROHS3 compliant and have active or extended availability.

Q: What is the impact of the 1ns propagation delay difference between 15ns and 16ns parts?

A: The 1ns difference is negligible in most digital logic applications. Both meet the 74HC27 specification. Select based on timing margin requirements in your specific circuit. For high-speed or time-critical applications, verify timing analysis with the actual propagation delay values.

Q: Can I use parts with different operating temperature ranges interchangeably?

A: Only if your application operates within the narrower temperature range. The 74HC27D,652 operates -40°C to 125°C. SN74HC27DR operates -40°C to 85°C. If your circuit requires operation above 85°C, use CD74HC27M96 (-55°C to 125°C) instead.