Alternatives to onsemi DM74LS123N
onsemi DM74LS123N and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 DM74LS123Nonsemi |  SN74LS123NTexas Instruments | SN74LS123NG4Texas Instruments | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Features the identical 16-pin layout and assignments as the original DM74LS123N.Standard 16-pin PDIP (0.300-inch width) through-hole package matching the physical dimensions.Operates within the same 4.75V to 5.25V voltage range and maintains identical LS-TTL input/output electrical characteristics. | Shares the exact pin assignment layout and physical footprint of the target device.Standard 16-pin PDIP through-hole housing.Maintains fully compatible LS-TTL voltage levels, drive strengths, and timing profiles. | ||
 AI Summary | DM74LS123N by onsemi: Monostable Multivibrator 45 ns 16-PDIP. | The SN74LS123N from Texas Instruments is a direct, active drop-in replacement that utilizes the same Low-power Schottky TTL technology as the obsolete onsemi original. It maintains identical electrical specifications, pinouts, and timing relationships, making it the most reliable second-source option.
| This is the green, lead-free (RoHS compliant) variant of the SN74LS123N, offering identical physical and electrical specifications to serve as a seamless drop-in replacement.
| |
| Lifecycle Status | Obsolete | Active | Unknown | |
| Market Availability | Discontinued | In stock | Non-stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Monostable Multivibrator 45 ns 16-PDIP | Monostable Multivibrator 28 ns 16-PDIP | Monostable Multivibrator 28 ns 16-PDIP | |
| Manufacturer | onsemi | Texas Instruments | Texas Instruments | |
| Type | Logic | Logic | Logic | |
| Datasheet | Open | Open | Open | |
| Lead Time | Unknown | 16 weeks | 8 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8542.39.0060 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| Logic Type | Monostable | - | - | |
| Mounting Type | Through Hole | - | - | |
| Package / Case | 16-DIP (0.300", 7.62mm) | - | - | |
| Voltage - Supply | 4.75 V ~ 5.25 V | - | - | |
| Propagation Delay | 45 ns | - | - | |
| Independent Circuits | 2 | - | - | |
| Operating Temperature | 0°C ~ 70°C | - | - | |
| Schmitt Trigger Input | No | - | - |
Unlock all 5 alternatives
- Find & compare verified second sources
- Spot risk early with real-time part monitoring
- Stay compliant and production-ready
Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 DM74LS132Nonsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
| DM74ALS00ANonsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
 DM74ALS240AWMonsemi | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
| DM74ALS244AWMonsemi | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
| DM7406Nonsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
 DM74AS1000AMonsemi | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
You searched one part. Parter watches your whole BOM.
All your BOM, at once
Parter maps every line to live stock, lead time, lifecycle and compliance data across the entire market — not part by part.
Hear about problems before they hit production
Allocation, EOL and last-time-buy notices surface the moment they appear, not when your buyer's PO bounces.
Qualified replacements in minutes, not days
Every at-risk line gets form-fit-function matches like the ones above — deltas flagged, evidence attached. Review, push to your BOM, and Parter starts watching the new part too.
Frequently asked questions
Yes. The onsemi DM74LS123N 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 DM74LS123N are the SN74LS123N (Texas Instruments) and the SN74LS123NG4 (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 DM74LS123N 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 DM74LS123N (onsemi) is a part in the Logic category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
Schedule a demo
See Parter in action
Discover how Parter can help your hardware team:
- Streamline your hardware operations with AI
- Detect and prevent lifecycle disruptions
- Accelerate product development
- Stay compliant and production-ready