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DM74S240N Equivalent & Substitute Parts
Part Overview
The DM74S240N is a Buffer, Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-PDIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part operates within the 74S logic series standard, with electrical characteristics suitable for TTL-level applications requiring signal inversion and buffering functions.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | Buffer, Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| Output Type | 3-State |
| Current - Output High, Low | 15mA, 64mA |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Package / Case | 20-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole |
| Series | 74S |
Substitute Part Grouping Explanation
Substitute parts for the DM74S240N are qualified based on strict electrical and mechanical parameter matching within the 74S logic series. The substitution criteria are:
- Identical logic function: Buffer, Inverting with 2 elements and 4 bits per element
- Matching output configuration: 3-State output type
- Identical electrical specifications: 15mA/64mA output current, 4.75V–5.25V supply voltage range
- Identical operating temperature range: 0°C–70°C
- Identical package: 20-DIP (0.300", 7.62mm) with Through Hole mounting
- Same base product number: 74S240
Two substitute parts meet these criteria: SN74S240N (Texas Instruments, Active status) and SN74S240NE4 (Texas Instruments, Active status). Both are direct parametric equivalents with no functional or electrical deviations from the original DM74S240N specification.
Parameter Comparison
| Parameter | DM74S240N (onsemi) | SN74S240N (TI) | SN74S240NE4 (TI) |
|---|---|---|---|
| Logic Type | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting |
| Number of Elements | 2 | 2 | 2 |
| Number of Bits per Element | 4 | 4 | 4 |
| Output Type | 3-State | 3-State | 3-State |
| Current - Output High, Low | 15mA, 64mA | 15mA, 64mA | 15mA, 64mA |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) |
| Package / Case | 20-DIP (0.300", 7.62mm) | 20-DIP (0.300", 7.62mm) | 20-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole | Through Hole | Through Hole |
| Series | 74S | 74S | 74S |
| Product Status | Obsolete | Active | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Both SN74S240N and SN74S240NE4 from Texas Instruments are direct functional and electrical equivalents to the obsolete DM74S240N. Selection between these two active alternatives should be based on:
SN74S240N: Recommended for standard procurement. Active product status ensures long-term availability and supply chain stability. ROHS3 compliance meets current environmental regulations.
SN74S240NE4: Functionally identical to SN74S240N with equivalent compliance certifications. Selection may be determined by packaging format (Tube) and supplier inventory availability.
Both parts carry REACH Unaffected status and EAR99 ECCN classification, matching the original part's regulatory profile. The transition from the obsolete onsemi part to either Texas Instruments substitute requires no circuit redesign, as all electrical and mechanical parameters are identical.
Frequently Asked Questions (FAQ)
Q: Can SN74S240N or SN74S240NE4 be used as direct replacements for DM74S240N?
A: Yes. Both parts are parametric equivalents with identical logic function, electrical specifications, and package configuration. No circuit modifications are required.
Q: What is the difference between SN74S240N and SN74S240NE4?
A: Both parts are electrically and functionally identical. The primary difference is packaging format: SN74S240N is supplied in Tube packaging, while SN74S240NE4 is also supplied in Tube. Selection may depend on supplier availability and procurement requirements.
Q: Why is the DM74S240N listed as obsolete?
A: Obsolete status indicates the part is no longer manufactured by onsemi. Active equivalents from Texas Instruments ensure continued design support and component availability.
Q: Are there any compliance differences between the original and substitute parts?
A: The substitute parts (SN74S240N and SN74S240NE4) are ROHS3 compliant, while the original DM74S240N compliance status is not specified. Both substitutes maintain REACH Unaffected and EAR99 ECCN classifications consistent with the original part.
Q: Can these parts be used interchangeably in existing designs?
A: Yes. The 20-DIP Through Hole package and identical pin configuration allow direct socket substitution. No PCB redesign or circuit modification is necessary.
Q: What supply voltage range do these parts support?
A: All three parts operate within 4.75V to 5.25V supply voltage range, standard for 74S series TTL logic.
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