Alternatives to onsemi SN74LS123D
onsemi SN74LS123D and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
| SN74LS123Donsemi |  SN74LS123DRTexas Instruments | SN74LS123DTexas Instruments | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Matches the SOIC-16 footprint and pinout assignment of the obsolete onsemi device exactly.Features the identical SOIC-16 package (0.154 inch, 3.90mm width) and surface-mount form factor.Operates under the identical TTL specifications, VCC supply range (4.75V to 5.25V), and timing parameters. | Matches the SOIC-16 footprint and pinout assignment of the obsolete onsemi device exactly.Features the identical SOIC-16 package (0.154 inch, 3.90mm width) and surface-mount form factor.Operates under the identical TTL specifications, VCC supply range (4.75V to 5.25V), and timing parameters. | ||
 AI Summary | SN74LS123D by onsemi: Monostable Multi-vibrator. | This is the direct, same-family drop-in replacement manufactured by Texas Instruments in tape-and-reel packaging. It offers identical bipolar TTL electrical characteristics, input/output levels, and propagation delays, ensuring seamless compatibility without modifying the PCB layout or external R/C timing calculations.
| This is the direct same-family replacement supplied in tube packaging, matching the exact suffix and packaging format of the original obsolete onsemi part. It guarantees identical behavior, timing performance, and voltage thresholds.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | Unknown | REACH | REACH | |
| RoHS | Unknown | RoHS | RoHS | |
| Description | Monostable Multi-vibrator | Monostable Multivibrator 28 ns 16-SOIC | Monostable Multivibrator 28 ns 16-SOIC | |
| Manufacturer | onsemi | Texas Instruments | Texas Instruments | |
| Type | Monostable Multi-vibrator | Logic | Logic | |
| Datasheet | Open | Open | Open | |
| Lead Time | Unknown | 9 weeks | 9 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | - | - | - | |
| Moisture Sensitivity Level | - | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
| SN74LS123Nonsemi | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
 SN74LV123ADTexas Instruments | In stock | Obsolete | 4Alternatives availableSee Alternatives |
 SN74LS13NTexas Instruments | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
| SN74LV123ADRTexas Instruments | In stock | Active | 3Alternatives availableSee Alternatives |
 SN74LS138NTexas Instruments | In stock | Active | 5Alternatives availableSee Alternatives |
 SN74LV123APWTexas Instruments | In stock | Obsolete | 5Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi SN74LS123D 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 SN74LS123D are the SN74LS123DR (Texas Instruments) and the SN74LS123D (Texas Instruments), out of 5 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 SN74LS123D 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 SN74LS123D (onsemi) is a part in the Monostable Multi-vibrator category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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