74HCT273D,652 Equivalent & Substitute Parts

Part Overview

The 74HCT273D,652 is a D-Type flip-flop logic integrated circuit manufactured by Nexperia USA Inc., featuring 1 element with 8-bit configuration in a 20-SOIC surface mount package. This component functions as a master reset flip-flop with positive edge triggering and non-inverted output. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across supply voltage, propagation delay, output current, and thermal operating range specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HCT273D,652
Manufacturer	Nexperia USA Inc.
Series	74HCT
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage - Supply	4.5V ~ 5.5V
Clock Frequency	36 MHz
Max Propagation Delay @ V, Max CL	30ns @ 4.5V, 50pF
Current - Output High, Low	4mA, 5.2mA
Current - Quiescent (Iq)	8 µA
Operating Temperature	-40°C ~ 125°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 74HCT273D,652 are classified based on electrical parameter compatibility and product availability status. The primary substitution criteria are:

Critical Parameters for Substitution:

Package type: 20-SOIC (0.295", 7.50mm Width) — all substitutes maintain identical mechanical compatibility
Supply voltage range: 4.5V ~ 5.5V — all substitutes operate within this specification
Logic function: D-Type flip-flop, 1 element, 8-bit configuration, positive edge trigger, non-inverted output
Propagation delay: Maximum 30ns at specified voltage and load conditions
Output current capability: Minimum 4mA high, 5.2mA low
Quiescent current: 8 µA maximum
Operating temperature: -40°C to 125°C minimum range

Substitute Categories:

Direct Substitutes (Electrical and Functional Equivalence):

74HCT273D,653 (NXP Semiconductors) — Active product status, identical electrical specifications
CD74HCT273M96 (Texas Instruments) — Active product status, enhanced clock frequency (50 MHz), meets all propagation delay requirements
SN74HCT273DWR (Texas Instruments) — Active product status, meets all electrical parameters

Compatible Substitutes (Minor Parameter Variations Within Acceptable Range):

MC74HCT273ADWR2G (onsemi) — Active product status, clock frequency 30 MHz, propagation delay 25ns @ 5V (faster than required), quiescent current 4 µA (lower than specified)
MC74HCT273ADWG (onsemi) — Active product status, same electrical characteristics as MC74HCT273ADWR2G
MM74HCT273WM (Fairchild Semiconductor) — Active product status, clock frequency 68 MHz, propagation delay 37ns @ 5V (within tolerance), operating temperature -40°C to 85°C (narrower range)
MM74HCT273WMX (Fairchild Semiconductor) — Active product status, identical specifications to MM74HCT273WM
SN74HCT273DW (Texas Instruments) — Discontinued at DiGi Electronics, clock frequency 37 MHz, propagation delay 29ns @ 5.5V

Upgrade Substitute (Enhanced Performance):

CD74HCT273M (Harris Corporation) — Obsolete product status, clock frequency 50 MHz, input capacitance 10 pF, RoHS non-compliant

Parameter Comparison

Part Number	Manufacturer	Status	Clock Freq (MHz)	Prop Delay (ns)	Iq (µA)	Temp Range (°C)	RoHS	Package
74HCT273D,652	Nexperia USA Inc.	Obsolete	36	30 @ 4.5V	8	-40 to 125	ROHS3	20-SOIC
74HCT273D,653	NXP Semiconductors	Active	36	30 @ 4.5V	8	-40 to 125	—	20-SOIC
CD74HCT273M96	Texas Instruments	Active	50	30 @ 4.5V	8	-55 to 125	ROHS3	20-SOIC
MC74HCT273ADWR2G	onsemi	Active	30	25 @ 5V	4	-55 to 125	ROHS3	20-SOIC
MC74HCT273ADWG	onsemi	Active	30	25 @ 5V	4	-55 to 125	ROHS3	20-SOIC
MM74HCT273WM	Fairchild Semiconductor	Active	68	37 @ 5V	8	-40 to 85	—	20-SOIC
MM74HCT273WMX	Fairchild Semiconductor	Active	68	37 @ 5V	8	-40 to 85	—	20-SOIC
SN74HCT273DW	Texas Instruments	Discontinued	37	29 @ 5.5V	8	-40 to 85	ROHS3	20-SOIC
SN74HCT273DWR	Texas Instruments	Active	37	29 @ 5.5V	8	-40 to 85	ROHS3	20-SOIC
CD74HCT273M	Harris Corporation	Obsolete	50	30 @ 4.5V	8	-55 to 125	Non-compliant	20-SOIC

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement: Select 74HCT273D,653 (NXP Semiconductors) as the first choice substitute. This part maintains identical electrical specifications to the original 74HCT273D,652 and carries active product status with full availability. Both parts share the same base product number (74HCT273) and operate within identical parameter ranges.

Alternative for Extended Temperature Range: CD74HCT273M96 (Texas Instruments) provides an active product with extended operating temperature range (-55°C to 125°C) and enhanced clock frequency (50 MHz). This part meets all propagation delay and output current requirements while maintaining ROHS3 compliance.

Selection for Reduced Power Consumption: MC74HCT273ADWR2G or MC74HCT273ADWG (onsemi) offer lower quiescent current (4 µA versus 8 µA) and faster propagation delay (25ns @ 5V). These parts are suitable for applications where power efficiency is prioritized, provided the narrower operating temperature range (-55°C to 125°C) is acceptable.

Consideration for High-Speed Applications: MM74HCT273WM or MM74HCT273WMX (Fairchild Semiconductor) feature the highest clock frequency (68 MHz) among available substitutes. These parts are appropriate for applications requiring maximum speed margin, though the operating temperature range is limited to -40°C to 85°C.

Avoid:

CD74HCT273M (Harris Corporation) — Obsolete status and RoHS non-compliance make this unsuitable for new designs
SN74HCT273DW (Texas Instruments) — Discontinued at DiGi Electronics; use SN74HCT273DWR instead

Compliance Considerations: All recommended active substitutes maintain ROHS3 compliance except MM74HCT273WM and MM74HCT273WMX. For applications requiring RoHS certification, select from 74HCT273D,653, CD74HCT273M96, MC74HCT273ADWR2G, MC74HCT273ADWG, or SN74HCT273DWR.

Frequently Asked Questions (FAQ)

Q: Can I use 74HCT273D,653 as a direct replacement for 74HCT273D,652? A: Yes. Both parts share identical electrical specifications, package type (20-SOIC), and functional characteristics. The primary difference is product status: 74HCT273D,653 is active while 74HCT273D,652 is obsolete. 74HCT273D,653 is the recommended direct substitute.

Q: What is the difference between MC74HCT273ADWR2G and MC74HCT273ADWG? A: Both parts are manufactured by onsemi and share identical electrical specifications. The difference is packaging: MC74HCT273ADWR2G is supplied in Cut Tape (CT) & Digi-Reel format, while MC74HCT273ADWG is supplied in Tube packaging. Select based on your procurement and assembly requirements.

Q: Why do some substitutes have different propagation delays? A: Propagation delay varies based on measurement conditions (voltage and load capacitance). The original part specifies 30ns @ 4.5V, 50pF. Substitutes measured at different conditions (e.g., 25ns @ 5V) still meet the requirement because measurement at higher voltage and same load typically yields faster results. Verify that your application's voltage and load conditions are compatible with the substitute's specified delay.

Q: Can I use MM74HCT273WM in applications requiring -55°C operation? A: No. MM74HCT273WM operates only to -40°C minimum. For applications requiring -55°C operation, select CD74HCT273M96, MC74HCT273ADWR2G, MC74HCT273ADWG, or CD74HCT273M.

Q: Are all substitutes RoHS compliant? A: No. MM74HCT273WM and MM74HCT273WMX do not list RoHS compliance status. For RoHS-certified applications, use 74HCT273D,653, CD74HCT273M96, MC74HCT273ADWR2G, MC74HCT273ADWG, or SN74HCT273DWR.

Q: What is the difference between SN74HCT273DW and SN74HCT273DWR? A: Both are Texas Instruments parts with identical electrical specifications. SN74HCT273DW is supplied in Tube packaging and is discontinued at DiGi Electronics. SN74HCT273DWR is supplied in Cut Tape (CT) & Digi-Reel format and maintains active product status. Use SN74HCT273DWR for new designs and ongoing production.

Q: Can I substitute a part with lower quiescent current (4 µA) for the original specification (8 µA)? A: Yes. Lower quiescent current is a beneficial characteristic that reduces power consumption without compromising functionality. Parts like MC74HCT273ADWR2G and MC74HCT273ADWG with 4 µA quiescent current are suitable substitutes.

Q: Does higher clock frequency (68 MHz vs. 36 MHz) affect compatibility? A: No. Higher clock frequency indicates greater speed capability and does not affect compatibility with circuits designed for lower frequencies. Parts like MM74HCT273WM and MM74HCT273WMX with 68 MHz clock frequency are fully compatible with applications using the original 36 MHz specification.

Q: What packaging options are available for substitutes? A: All substitutes use the 20-SOIC (0.295", 7.50mm Width) surface mount package, maintaining mechanical compatibility. Packaging format varies: Tube, Cut Tape (CT) & Digi-Reel, and Bulk. Select based on your assembly process and procurement requirements.

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