74ABT273CSJ Equivalent & Substitute Parts

Part Overview

The 74ABT273CSJ is an 8-bit D-type flip-flop logic integrated circuit manufactured by onsemi in a 20-SOIC surface mount package. This device functions as a master reset flip-flop with positive edge triggering and non-inverted outputs, operating at clock frequencies up to 200 MHz. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production requirements. Substitute parts maintain functional compatibility while offering active product status and improved availability.

Substiute Parts

74ABT273CSJ

onsemiIn Stock: 93974ABT273CSJ Datasheet

Current PartRFQ

SN74ABT273NS

Texas InstrumentsIn Stock: 1048SN74ABT273NS Datasheet

DirectRFQ

SN74ABT273NSR

Texas InstrumentsIn Stock: 2281SN74ABT273NSR Datasheet

DirectRFQ

CY74FCT273ATSOCT

Texas InstrumentsIn Stock: 1668CY74FCT273ATSOCT Datasheet

SimilarRFQ

CY74FCT273CTSOC

Texas InstrumentsIn Stock: 3421CY74FCT273CTSOC Datasheet

SimilarRFQ

SN74ABT273DW

Texas InstrumentsIn Stock: 3508SN74ABT273DW Datasheet

SimilarRFQ

SN74ABT273DWR

Texas InstrumentsIn Stock: 8569SN74ABT273DWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence in the following critical parameters:

Mandatory Equivalence Parameters:

• Function: Master Reset
• Type: D-Type Flip-Flop
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: Non-Inverted
• Trigger Type: Positive Edge
• Operating Temperature Range: -40°C ~ 85°C
• Moisture Sensitivity Level: 1 (Unlimited)

Compatible Variation Parameters:

• Clock Frequency: 150 MHz minimum (74ABT series) or device-specific (74FCT series)
• Max Propagation Delay: 5.8 ns to 7.2 ns at specified conditions
• Voltage Supply Range: 4.5V ~ 5.5V (74ABT) or 4.75V ~ 5.25V (74FCT)
• Current Output: 32 mA / 64 mA (consistent across all parts)
• Package Width: 0.209" (5.30mm) or 0.295" (7.50mm) SOIC variants
• Quiescent Current: 30 µA to 400 µA
• Input Capacitance: 5 pF to 7 pF

Substitutes are classified as Direct (identical series and performance) or Similar (different series with compatible functional parameters).

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (74ABT Series - Identical Functional Performance):

SN74ABT273NS and SN74ABT273NSR are direct functional equivalents manufactured by Texas Instruments in the 74ABT series. Both maintain identical propagation delay (6.8 ns @ 5V, 50pF), output current specifications, and voltage supply range. These parts are active products with ROHS3 compliance. SN74ABT273NSR is supplied in Tape & Reel packaging with higher inventory availability (2254 pcs), while SN74ABT273NS is supplied in standard packaging (1027 pcs). Both are suitable for direct replacement in applications requiring the original 0.209" (5.30mm) SOIC package width.

SN74ABT273DW and SN74ABT273DWR are functionally equivalent 74ABT series parts with identical electrical specifications but in a wider 0.295" (7.50mm) SOIC package. These require PCB layout verification for package width compatibility. SN74ABT273DWR in Tape & Reel format offers the highest inventory (8485 pcs).

Similar Substitutes (74FCT Series - Compatible Functional Performance):

CY74FCT273ATSOCT and CY74FCT273CTSOC are 74FCT series alternatives with compatible functional parameters. These parts operate within a narrower voltage supply range (4.75V ~ 5.25V) compared to the 74ABT series (4.5V ~ 5.5V). Propagation delay specifications differ: CY74FCT273ATSOCT at 7.2 ns and CY74FCT273CTSOC at 5.8 ns, both measured at 50pF load. Both are ROHS3 compliant active products. The 74FCT series is suitable for applications where the narrower voltage tolerance and different package width (0.295", 7.50mm) are acceptable.

All substitute parts maintain identical functional architecture (Master Reset, D-Type, 8-bit, Positive Edge trigger, Non-Inverted output) and operating temperature range (-40°C ~ 85°C). Selection should prioritize active product status and compliance certifications over the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT273NS replace 74ABT273CSJ in existing designs?

A: Yes. SN74ABT273NS is a direct functional equivalent with identical propagation delay (6.8 ns), output current (32 mA / 64 mA), and voltage supply range (4.5V ~ 5.5V). Both use the same 0.209" (5.30mm) SOIC package width. The primary difference is manufacturer (Texas Instruments vs. onsemi) and active product status.

Q: What is the difference between SN74ABT273NS and SN74ABT273NSR?

A: Both are functionally identical 74ABT series parts with the same electrical specifications. The difference is packaging format: SN74ABT273NS is supplied in standard packaging, while SN74ABT273NSR is supplied in Tape & Reel (TR) format for automated assembly. SN74ABT273NSR has higher inventory availability (2254 pcs vs. 1027 pcs).

Q: Can I use CY74FCT273CTSOC instead of SN74ABT273DW?

A: Both parts are functionally compatible with identical 8-bit D-type flip-flop architecture, Master Reset function, and Positive Edge triggering. However, the 74FCT series operates within a narrower voltage supply range (4.75V ~ 5.25V) compared to 74ABT (4.5V ~ 5.5V). Verify your power supply specifications before substitution. Both use the wider 0.295" (7.50mm) SOIC package.

Q: Why do some substitutes have different quiescent current specifications?

A: Quiescent current (Iq) varies by manufacturer and series design. The 74ABT273CSJ specifies 50 µA, while substitutes range from 30 mA (SN74ABT273NS) to 400 µA (SN74ABT273NSR, SN74ABT273DW, SN74ABT273DWR). These variations do not affect functional compatibility but may impact power consumption in battery-powered or low-power applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. The original 74ABT273CSJ does not specify RoHS status. All substitutes meet current environmental compliance requirements.

Q: What is the significance of package width differences (0.209" vs. 0.295")?

A: Package width affects PCB footprint and board layout. The original 74ABT273CSJ uses 0.209" (5.30mm) width. Direct substitutes SN74ABT273NS and SN74ABT273NSR maintain this width. Wider alternatives (SN74ABT273DW, SN74ABT273DWR, CY74FCT273ATSOCT, CY74FCT273CTSOC) use 0.295" (7.50mm) width and require PCB layout verification for compatibility.

Q: Can I mix 74ABT and 74FCT series parts in the same design?

A: Both series are functionally compatible for this 8-bit D-type flip-flop application. However, the 74FCT series operates within a narrower voltage supply range (4.75V ~ 5.25V) compared to 74ABT (4.5V ~ 5.5V). If mixing series, ensure your power supply meets the most restrictive specification (4.75V ~ 5.25V).