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DM74AS161N Binary Counter 4-Bit Logic IC Equivalent & Substitute Parts
Part Overview
The DM74AS161N is a 4-bit binary counter IC manufactured by onsemi, designed for synchronous counting applications with positive edge triggering. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production, maintenance, and new design implementations. The part operates within the 74AS logic family standard, providing reliable counting functionality in through-hole 16-DIP packaging.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | Binary Counter |
| Number of Bits per Element | 4 |
| Number of Elements | 1 |
| Direction | Up |
| Reset Type | Asynchronous |
| Timing | Synchronous |
| Trigger Type | Positive Edge |
| Voltage Supply Range | 4.5 V ~ 5.5 V |
| Operating Temperature Range | 0°C ~ 70°C |
| Package / Case | 16-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole |
| Series | 74AS |
Substitute Part Grouping Explanation
Substitution for the DM74AS161N is determined by strict equivalence across the following critical parameters:
- Logic Function: Binary counter with 4-bit capacity, single element configuration
- Electrical Characteristics: Positive edge triggering, asynchronous reset, synchronous timing operation
- Supply Voltage: 4.5 V to 5.5 V compatibility
- Operating Temperature: 0°C to 70°C range
- Package Compatibility: 16-DIP through-hole form factor with 0.300" (7.62mm) pitch
- Base Product Number: 74AS161 family designation
The SN74AS161N from Texas Instruments meets all substitution criteria within the 74AS logic family standard, maintaining functional and electrical equivalence despite differences in count rate specifications and product status classifications.
Parameter Comparison
| Parameter | DM74AS161N (onsemi) | SN74AS161N (Texas Instruments) |
|---|---|---|
| Logic Type | Binary Counter | Binary Counter |
| Number of Bits per Element | 4 | 4 |
| Number of Elements | 1 | 1 |
| Direction | Up | Up |
| Reset Type | Asynchronous | Asynchronous |
| Timing | Synchronous | Synchronous |
| Trigger Type | Positive Edge | Positive Edge |
| Voltage Supply Range | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V |
| Operating Temperature Range | 0°C ~ 70°C | 0°C ~ 70°C |
| Package / Case | 16-DIP (0.300", 7.62mm) | 16-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole | Through Hole |
| Series | 74AS | 74AS |
| Base Product Number | 74AS161 | 74AS161 |
Engineering Selection Recommendations
The SN74AS161N from Texas Instruments is a direct substitute for the DM74AS161N. Selection between these parts should be based on the following factors:
Product Status: The DM74AS161N is classified as obsolete, while the SN74AS161N maintains active product status. For new designs and long-term production requirements, the SN74AS161N is the preferred selection due to ongoing manufacturer support and availability.
Compliance and Certifications: The SN74AS161N carries RoHS3 compliance certification, whereas the DM74AS161N does not specify RoHS status. Both parts maintain REACH Unaffected status and EAR99 export classification. For applications requiring RoHS compliance, the SN74AS161N is the appropriate choice.
Packaging and Inventory: Both parts are supplied in 16-PDIP through-hole packaging. The SN74AS161N is available in tube packaging with higher inventory levels, supporting consistent supply chain management.
Functional Equivalence: Both parts operate identically within the specified electrical and thermal parameters, ensuring direct pin-for-pin and functional compatibility in existing circuit designs.
Frequently Asked Questions (FAQ)
Q: Can the SN74AS161N directly replace the DM74AS161N in existing designs?
A: Yes. Both parts share identical logic function, pin configuration, electrical characteristics, and operating parameters within the 74AS161 family standard. Direct substitution is supported without circuit modification.
Q: What is the difference in count rate between these parts?
A: The DM74AS161N specifies a count rate of 75 MHz, while the SN74AS161N specifies 40 MHz. Both rates are sufficient for standard 74AS logic family applications. Application-specific timing requirements should be evaluated against actual circuit specifications.
Q: Are there packaging differences between these parts?
A: Both parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging. The SN74AS161N is supplied in tube packaging, while the DM74AS161N packaging format is not specified in available data.
Q: Why is the DM74AS161N classified as obsolete?
A: Obsolescence reflects manufacturer discontinuation decisions. The SN74AS161N remains in active production, making it the recommended selection for new applications and ongoing production support.
Q: Are there compliance differences between these parts?
A: The SN74AS161N carries RoHS3 compliance certification. Both parts maintain REACH Unaffected status. Applications requiring RoHS compliance should specify the SN74AS161N.
Q: What is the base product number for these parts?
A: Both the DM74AS161N and SN74AS161N share the base product number 74AS161, indicating they belong to the same logic family and functional group.
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