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DM74ALS645AWMX Equivalent & Substitute Parts
Part Overview
The DM74ALS645AWMX is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This component operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | DM74ALS645AWMX |
| Manufacturer | onsemi |
| Series | 74ALS |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 15mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the DM74ALS645AWMX is determined by the following critical parameters:
- Logic Type: Transceiver, Non-Inverting
- Number of Elements: 1
- Number of Bits per Element: 8
- Output Type: 3-State
- Current - Output High, Low: 15mA, 24mA
- Voltage - Supply: 4.5V ~ 5.5V
- Operating Temperature: 0°C ~ 70°C (TA)
- Package / Case: 20-SOIC (0.295", 7.50mm Width)
Substitute parts are categorized into three groups:
Direct Manufacturer Substitutes: Parts with identical electrical specifications and the same 20-SOIC package footprint (0.295", 7.50mm Width), differing only in manufacturer or product status.
Similar Manufacturer Substitutes: Parts with identical electrical specifications but different package dimensions (20-SO with 0.209", 5.30mm Width), requiring PCB layout verification before implementation.
Parametric Equivalents: Parts with identical electrical specifications and package footprint but different base product numbers within the 74ALS series, maintaining full functional compatibility.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements | Bits/Element | Output Type | Current (High/Low) | Voltage Supply | Temp Range | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| DM74ALS645AWMX | onsemi | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295", 7.50mm) | Obsolete |
| SN74ALS645ADW | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295", 7.50mm) | Last Time Buy |
| SN74ALS645A-1DW | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295", 7.50mm) | Last Time Buy |
| SN74ALS1645ANSR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 16mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SO (0.209", 5.30mm) | Discontinued at DiGi Electronics |
| SN74ALS645A-1NSR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SO (0.209", 5.30mm) | Active |
| SN74ALS645ANSR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SO (0.209", 5.30mm) | Active |
| SN74ALS245A-1DWR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295", 7.50mm) | Active |
| SN74ALS245ADWR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295", 7.50mm) | Active |
| SN74ALS645A-1DWR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295", 7.50mm) | Active |
| SN74ALS645ADWR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295", 7.50mm) | Active |
Engineering Selection Recommendations
For Direct Replacement (Same PCB Footprint):
SN74ALS645ADWR and SN74ALS645A-1DWR are the primary recommendations. Both are manufactured by Texas Instruments with Active product status, ensuring long-term availability and supply chain stability. These parts maintain identical electrical specifications and the 20-SOIC (0.295", 7.50mm Width) package footprint, requiring no PCB modifications. SN74ALS645ADWR is available in Tape & Reel (TR) packaging with 1098 units in stock, while SN74ALS645A-1DWR is also available in Tape & Reel with 1106 units in stock. Both are ROHS3 Compliant.
SN74ALS245A-1DWR and SN74ALS245ADWR are parametric equivalents with identical electrical specifications and package footprint. These parts differ only in base product number (74ALS245 versus 74ALS645) but maintain full functional compatibility. Both are Active status with ROHS3 Compliance.
For Package-Variant Substitution (Different PCB Footprint):
SN74ALS645A-1NSR and SN74ALS645ANSR feature the 20-SO package (0.209", 5.30mm Width) with Active product status and ROHS3 Compliance. These parts require PCB layout verification due to different package dimensions. SN74ALS645ANSR has 1900 units in stock, while SN74ALS645A-1NSR has 4222 units in stock.
For Last-Time-Buy Scenarios:
SN74ALS645ADW and SN74ALS645A-1DW are classified as Last Time Buy, indicating limited future availability. These parts maintain identical specifications and 20-SOIC package footprint but should be considered only when Active alternatives are unavailable.
Frequently Asked Questions (FAQ)
Q: Can SN74ALS645ADWR be used as a direct replacement for DM74ALS645AWMX?
A: Yes. SN74ALS645ADWR is a direct replacement. Both parts share identical electrical specifications (1 element, 8 bits per element, 3-state output, 15mA/24mA output current, 4.5V–5.5V supply, 0°C–70°C operating temperature) and the same 20-SOIC (0.295", 7.50mm Width) package footprint. No PCB modifications are required.
Q: What is the difference between SN74ALS645ADWR and SN74ALS245ADWR?
A: Both parts are parametric equivalents with identical electrical specifications and package footprint. The difference lies in the base product number (74ALS645 versus 74ALS245). Both are suitable for the same application and require no design changes.
Q: Can I use SN74ALS645A-1NSR if SN74ALS645ADWR is unavailable?
A: SN74ALS645A-1NSR is electrically compatible but uses a different package (20-SO with 0.209", 5.30mm Width versus 20-SOIC with 0.295", 7.50mm Width). PCB layout verification is required before implementation due to different package dimensions.
Q: Why is the DM74ALS645AWMX marked as obsolete?
A: The DM74ALS645AWMX is classified as obsolete by onsemi. Active alternatives from Texas Instruments, such as SN74ALS645ADWR and SN74ALS645A-1DWR, are recommended for new designs and ongoing procurement to ensure supply chain continuity.
Q: Are all substitute parts ROHS3 Compliant?
A: All Texas Instruments substitute parts listed are ROHS3 Compliant. The original onsemi part (DM74ALS645AWMX) does not specify RoHS status in the provided data.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in multiple packaging formats: Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel®. Selection depends on procurement volume and assembly requirements. Tape & Reel packaging is standard for high-volume production.
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