Alternatives to onsemi SN74LS161AN
onsemi SN74LS161AN and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 SN74LS161ANonsemi | SN74LS161ANTexas Instruments |  CD74HCT161ETexas Instruments | +2more | |
|---|---|---|---|---|
| FFF Compatibility | Features an identical 16-pin PDIP layout and identical pin-for-pin signal assignments.Utilizes the same standard 16-DIP package with a 0.1-inch (2.54mm) pin pitch.Matches the original 25 MHz maximum count rate, 5V supply rating, and asynchronous reset behavior. | Shares the identical 16-DIP layout and pin-to-signal mapping as the original.Matches the physical dimensions and through-hole mounting profile of the original DIP package.Functions as a 4-bit binary counter with asynchronous reset, utilizing TTL-compatible inputs. | ||
 AI Summary | SN74LS161AN by onsemi: Counter IC Binary Counter 1 Element 4 Bit Positive Edge 16-PDIP. | This is the direct, active replacement for the obsolete onsemi part. It offers identical bipolar TTL characteristics, power levels, speed, and pinout, making it a safe and seamless choice.
| This high-speed CMOS (HCT) alternative is an excellent choice for modernizing the design while maintaining TTL logic level compatibility. It significantly reduces power consumption and extends the operating temperature range.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | Unknown | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Counter IC Binary Counter 1 Element 4 Bit Positive Edge 16-PDIP | Counter IC Binary Counter 1 Element 4 Bit Positive Edge 16-PDIP | Counter IC Binary Counter 1 Element 4 Bit Positive Edge 16-PDIP | |
| Manufacturer | onsemi | Texas Instruments | Texas Instruments | |
| Type | Logic | Logic | Logic | |
| Datasheet | Open | Open | Open | |
| Lead Time | 7 days | 16 weeks | 9 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8542.39.0070 | - | - | |
| Moisture Sensitivity Level | - | - | - | |
| Reset | Asynchronous | - | - | |
| Timing | Synchronous | - | - | |
| Direction | Up | - | - | |
| Count Rate | 25 MHz | - | - | |
| Logic Type | Binary Counter | - | - | |
| Trigger Type | Positive Edge | - | - | |
| Mounting Type | Through Hole | - | - | |
| Package / Case | 16-DIP (0.300", 7.62mm) | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 SN74LS165ANTexas Instruments | In stock | Active | 5Alternatives availableSee Alternatives |
 SN74LS13NTexas Instruments | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
| SN74LS123Nonsemi | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
| SN74LS138NTexas Instruments | In stock | Active | 5Alternatives availableSee Alternatives |
| SN74LS123Donsemi | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
 SN74LS240Nonsemi | In stock | Obsolete | 4Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi SN74LS161AN is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the onsemi SN74LS161AN are the SN74LS161AN (Texas Instruments) and the CD74HCT161E (Texas Instruments), out of 4 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the SN74LS161AN are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The SN74LS161AN (onsemi) is a part in the Logic category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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