Alternatives to onsemi SN74LS240N
onsemi SN74LS240N and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 SN74LS240Nonsemi |  SN74LS240NTexas Instruments | CD74HCT240ETexas Instruments | +2more | |
|---|---|---|---|---|
| FFF Compatibility | Same 20-PDIP package and 1:1 identical pinout.Identical physical dimensions and DIP mounting style.Same 74LS series logic family with identical electrical parameters, supply voltage range (4.75V to 5.25V), and timing. | Same 20-PDIP package and identical pin layout.Interchangeable standard DIP package.Maximum output drive current is lower (6mA sink/source) compared to the original LS TTL output drive (24mA sink, 15mA source). | ||
 AI Summary | SN74LS240N by onsemi: Buffer, Inverting 2 Element 4 Bit per Element 3-State Output 20-PDIP. | The SN74LS240N from Texas Instruments is a direct, active drop-in replacement for the obsolete onsemi part, offering identical electrical ratings, performance, and package style.
| The CD74HCT240E is an active HCT CMOS equivalent that offers low power consumption and TTL-compatible inputs, making it an excellent replacement for applications that do not require maximum LS TTL output drive.
| |
| Lifecycle Status | Obsolete | Active | Unknown | |
| Market Availability | In stock | In stock | Unknown | |
| REACH | Unknown | REACH | Unknown | |
| RoHS | RoHS | RoHS | Unknown | |
| Description | Buffer, Inverting 2 Element 4 Bit per Element 3-State Output 20-PDIP | Buffer, Inverting 2 Element 4 Bit per Element 3-State Output 20-PDIP | The CD74HCT240E is an active HCT CMOS equivalent that offers low power consumption and TTL-compatible inputs, making it an excellent replace | |
| Manufacturer | onsemi | Texas Instruments | Texas Instruments | |
| Type | Logic | Logic | Component | |
| Datasheet | Open | Open | N/A | |
| Lead Time | 7 days | 16 weeks | Unknown | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8542.39.0070 | - | - | |
| Moisture Sensitivity Level | - | - | - | |
| Logic Type | Buffer, Inverting | - | - | |
| Output Type | 3-State | - | - | |
| Mounting Type | Through Hole | - | - | |
| Package / Case | 20-DIP (0.300", 7.62mm) | - | - | |
| Voltage - Supply | 4.75V ~ 5.25V | - | - | |
| Number of Elements | 2 | - | - | |
| Operating Temperature | 0°C ~ 70°C (TA) | - | - | |
| Supplier Device Package | 20-PDIP | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
| SN74LS123Nonsemi | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
 SN74LS374Nonsemi | In stock | Obsolete | 5Alternatives availableSee Alternatives |
 SN74HCT240NTexas Instruments | In stock | Active | 5Alternatives availableSee Alternatives |
| SN74F245NTexas Instruments | In stock | Active | 5Alternatives availableSee Alternatives |
 SN74LS13NTexas Instruments | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
| SN74LS123Donsemi | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi SN74LS240N 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 SN74LS240N are the SN74LS240N (Texas Instruments) and the CD74HCT240E (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 SN74LS240N 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 SN74LS240N (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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