CD74HC27M NOR Gate IC Equivalent & Substitute Parts

Part Overview

The CD74HC27M is a 3-channel NOR gate logic IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This component implements three independent 3-input NOR gates on a single die, operating across a 2V to 6V supply voltage range with propagation delays of 16ns at 6V with 50pF load.

The CD74HC27M is currently discontinued at DiGi Electronics. Identifying functionally equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Substiute Parts

CD74HC27M

Texas InstrumentsIn Stock: 1657CD74HC27M Datasheet

Current PartRFQ

CD74HC27M96

Texas InstrumentsIn Stock: 2233CD74HC27M96 Datasheet

DirectRFQ

74HC27D,653

Nexperia USA Inc.In Stock: 1450174HC27D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD74HC27M are identified based on strict electrical and mechanical parameter matching within the 74HC logic family. The substitution criteria are:

• Logic type: NOR Gate with 3 channels and 3 inputs per channel
• Voltage supply range: 2V ~ 6V
• Output current capability: 5.2mA minimum for both high and low states
• Input logic levels: Low 0.5V ~ 1.8V, High 1.5V ~ 4.2V
• Propagation delay: Maximum 16ns at 6V with 50pF load
• Operating temperature range: Minimum -55°C ~ 125°C
• Mounting type: Surface Mount
• Package: 14-SOIC form factor
• RoHS3 compliance and MSL Level 1

Substitutes are grouped by packaging configuration (Tube, Tape & Reel, Cut Tape) and product status (Active, Discontinued). All identified substitutes maintain functional equivalence across the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

CD74HC27M96 is the primary direct substitute. Manufactured by Texas Instruments, it maintains identical electrical specifications and operating temperature range (-55°C ~ 125°C) as the original CD74HC27M. The only difference is packaging configuration: CD74HC27M96 is supplied in Tape & Reel format rather than Tube. Product status is Active, ensuring ongoing availability. This part is suitable for applications requiring the full temperature range and is recommended for designs with no temperature constraints below -40°C.

74HC27D,653 is a manufacturer-recommended alternative from Nexperia USA Inc. It meets all core electrical specifications and maintains ROHS3 compliance and MSL Level 1 rating. The operating temperature range is -40°C ~ 125°C, which is narrower than the original part. Propagation delay is 15ns at 6V with 50pF load, which is superior to the 16ns specification of the main part. Product status is Active. This part is suitable for applications operating within the -40°C to 125°C range and where improved propagation delay performance is acceptable.

Selection between substitutes depends on application temperature requirements and packaging preferences. Both substitutes are electrically compatible and maintain full functional equivalence within their specified operating ranges.

Frequently Asked Questions (FAQ)

Q: Can CD74HC27M96 be used as a direct replacement for CD74HC27M?

A: Yes. CD74HC27M96 is electrically and functionally identical to CD74HC27M. Both are manufactured by Texas Instruments with identical logic specifications, voltage supply range, output current, input logic levels, propagation delay, and operating temperature range (-55°C ~ 125°C). The difference is packaging configuration: CD74HC27M is supplied in Tube, while CD74HC27M96 is supplied in Tape & Reel. Both use the same 14-SOIC package footprint.

Q: What is the difference between 74HC27D,653 and the original CD74HC27M?

A: 74HC27D,653 is manufactured by Nexperia USA Inc. instead of Texas Instruments. Electrical specifications are identical except for two parameters: operating temperature range is -40°C ~ 125°C (versus -55°C ~ 125°C), and propagation delay is 15ns at 6V with 50pF load (versus 16ns). Both parts use the 14-SOIC package and are ROHS3 compliant with MSL Level 1 rating.

Q: Are all three parts pin-compatible?

A: Yes. All three parts (CD74HC27M, CD74HC27M96, and 74HC27D,653) use the 14-SOIC package with identical pinout. They are mechanically and electrically interchangeable at the board level.

Q: Which substitute should I use if my application operates below -40°C?

A: CD74HC27M96 is the appropriate choice for applications requiring operation below -40°C, as it maintains the full -55°C ~ 125°C operating temperature range of the original CD74HC27M. The 74HC27D,653 is rated only to -40°C minimum.

Q: Are there any compliance or certification differences between the substitutes?

A: No. All three parts are ROHS3 compliant, have MSL Level 1 (Unlimited) moisture sensitivity rating, and are REACH Unaffected. Compliance status is identical across all substitutes.

Q: What is the difference between Tube, Tape & Reel, and Cut Tape packaging?

A: These are packaging and delivery configurations that do not affect component functionality. Tube packaging is used for manual handling and small quantities. Tape & Reel (TR) is used for automated assembly processes with higher quantities. Cut Tape (CT) & Digi-Reel® is a hybrid format. All three deliver the same 14-SOIC component.