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74VHC273N Equivalent & Substitute Parts
Part Overview
The 74VHC273N is a D-Type flip-flop logic integrated circuit featuring 1 element with 8-bit configuration and positive edge triggering. Manufactured by onsemi in a 20-DIP through-hole package, this component is classified as obsolete. Due to its obsolete status, identifying compatible substitute parts is essential for design continuity, procurement flexibility, and long-term project viability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74VHC273N |
| Manufacturer | onsemi |
| Category | Logic |
| Type | D-Type Flip Flop |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Clock Frequency | 110 MHz |
| Trigger Type | Positive Edge |
| Output Type | Non-Inverted |
| Voltage Supply Range | 2V ~ 5.5V |
| Package / Case | 20-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole |
| Operating Temperature | -40°C ~ 85°C |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the 74VHC273N is determined by the following critical parameters:
- Logic Function: D-Type flip-flop with 1 element, 8-bit configuration, positive edge trigger, non-inverted output, and master reset function
- Electrical Specifications: Clock frequency of 110 MHz, propagation delay of 11ns @ 5V with 50pF load, output current of 8mA (high and low), supply voltage range of 2V ~ 5.5V, and quiescent current of 4 µA
- Package Compatibility: 20-DIP (0.300", 7.62mm) through-hole mounting
- Mechanical Fit: Pin count, pitch, and physical dimensions must match for direct board-level substitution
The SN74AHC273N from Texas Instruments meets all these criteria and qualifies as a direct substitute.
Parameter Comparison
| Parameter | 74VHC273N (onsemi) | SN74AHC273N (Texas Instruments) |
|---|---|---|
| Type | D-Type Flip Flop | D-Type Flip Flop |
| Number of Elements | 1 | 1 |
| Number of Bits per Element | 8 | 8 |
| Clock Frequency | 110 MHz | 110 MHz |
| Trigger Type | Positive Edge | Positive Edge |
| Output Type | Non-Inverted | Non-Inverted |
| Max Propagation Delay @ V, Max CL | 11ns @ 5V, 50pF | 11ns @ 5V, 50pF |
| Current - Output High, Low | 8mA, 8mA | 8mA, 8mA |
| Voltage - Supply | 2V ~ 5.5V | 2V ~ 5.5V |
| Current - Quiescent (Iq) | 4 µA | 4 µA |
| Package / Case | 20-DIP (0.300", 7.62mm) | 20-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole | Through Hole |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Product Status | Obsolete | Active |
| REACH Status | REACH Unaffected | REACH Unaffected |
| ECCN | EAR99 | EAR99 |
Engineering Selection Recommendations
The SN74AHC273N from Texas Instruments is the qualified substitute for the 74VHC273N. Selection is based on the following factors:
Product Status: The 74VHC273N is obsolete, while the SN74AHC273N maintains active production status, ensuring long-term availability and supply chain stability.
Compliance and Certifications: Both parts carry identical REACH Unaffected and EAR99 ECCN classifications, confirming regulatory equivalence. The SN74AHC273N is ROHS3 Compliant, meeting modern environmental standards.
Electrical and Functional Equivalence: All critical electrical parameters—clock frequency, propagation delay, output current, supply voltage range, and quiescent current—are identical. The logic function, trigger type, output configuration, and pin count are fully compatible.
Operating Temperature Range: The SN74AHC273N supports an extended operating temperature range of -40°C ~ 125°C compared to the 74VHC273N's -40°C ~ 85°C. This provides additional thermal margin for demanding applications.
Package Compatibility: Both parts use identical 20-DIP (0.300", 7.62mm) through-hole packaging, enabling direct board-level substitution without layout modifications.
Frequently Asked Questions (FAQ)
Q: Can the SN74AHC273N replace the 74VHC273N in existing designs?
A: Yes. The SN74AHC273N is electrically and functionally equivalent with identical pin configuration, package dimensions, and all critical electrical specifications. Direct substitution is possible without circuit modifications.
Q: Are there differences in input capacitance between these parts?
A: The 74VHC273N specifies 4 pF input capacitance, while the SN74AHC273N specifies 2.5 pF. The lower input capacitance of the substitute may provide marginal improvements in switching performance but does not affect functional compatibility.
Q: Why is the operating temperature range different?
A: The SN74AHC273N supports -40°C ~ 125°C, exceeding the 74VHC273N's -40°C ~ 85°C range. This extended range reflects Texas Instruments' design specifications and provides additional thermal headroom for applications operating at elevated temperatures.
Q: What is the packaging difference between the main part and substitute?
A: The 74VHC273N is supplied in standard packaging, while the SN74AHC273N is supplied in Tube packaging. Both use identical 20-DIP (0.300", 7.62mm) through-hole package geometry, ensuring mechanical and electrical compatibility.
Q: Are both parts RoHS compliant?
A: The SN74AHC273N is ROHS3 Compliant. The 74VHC273N does not specify RoHS status in the provided data. For new designs, the SN74AHC273N is recommended to meet current environmental compliance requirements.
Q: Is the SN74AHC273N available in inventory?
A: Yes, 2046 pieces of the SN74AHC273N are available as new original stock, providing immediate procurement availability for design transitions.
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