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DM74ALS645AWM Equivalent & Substitute Parts
Part Overview
The DM74ALS645AWM 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 a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | DM74ALS645AWM |
| Manufacturer | onsemi |
| 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) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the DM74ALS645AWM 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 two groups:
Direct Substitutes (Pin-Compatible, Same Package): Parts maintaining identical electrical specifications and 20-SOIC (0.295", 7.50mm Width) packaging. These include SN74ALS645ADWR, SN74ALS645A-1DWR, SN74ALS645A-1DW, and SN74ALS645ADW from Texas Instruments.
Parametric Equivalents (Electrical Compatibility, Alternative Packaging): Parts meeting all electrical specifications but available in alternative packaging formats (Tube vs. Tape & Reel) or with different base product numbers within the 74ALS series. These include SN74ALS245A-1DW, SN74ALS245ADW, and SN74ALS623ADW.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements | Bits/Element | Output Type | Current (High/Low) | Voltage Supply | Temp Range | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM74ALS645AWM | onsemi | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Obsolete | REACH Unaffected |
| SN74ALS645ADWR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Active | ROHS3 Compliant |
| 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") | Active | ROHS3 Compliant |
| 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") | Last Time Buy | ROHS3 Compliant |
| SN74ALS645ADW | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Last Time Buy | ROHS3 Compliant |
| SN74ALS245A-1DW | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Last Time Buy | ROHS3 Compliant |
| SN74ALS245ADW | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Last Time Buy | ROHS3 Compliant |
| SN74ALS623ADW | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Active | ROHS3 Compliant |
| SN74ALS1645ANSR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 16mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SO (0.209") | Discontinued at DiGi Electronics | ROHS3 Compliant |
| 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") | Active | ROHS3 Compliant |
| SN74ALS645ANSR | Texas Instruments | Transceiver, Non-Inverting | 1 | 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SO (0.209") | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: SN74ALS645ADWR (Texas Instruments) is the preferred direct substitute. This part maintains identical electrical specifications, package dimensions, and pin configuration while offering active product status and ROHS3 compliance. Current inventory of 1098 units supports production requirements.
Secondary Recommendations: SN74ALS645A-1DWR and SN74ALS645A-1DW provide equivalent functionality with active or last-time-buy status. Both maintain the 20-SOIC (0.295", 7.50mm Width) package specification required for direct PCB compatibility.
Alternative Selections: SN74ALS623ADW and SN74ALS245A-1DW meet all electrical and thermal specifications within the same package footprint. SN74ALS623ADW carries active product status, while SN74ALS245A-1DW is designated last-time-buy.
Package Variant Consideration: SN74ALS645A-1NSR and SN74ALS645ANSR utilize the 20-SO (0.209", 5.30mm Width) package. These parts are electrically compatible but require PCB layout modification due to reduced package width. Both maintain active product status.
Compliance Status: All Texas Instruments substitutes are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The original onsemi part carries REACH unaffected status but lacks RoHS certification due to obsolete classification.
Frequently Asked Questions (FAQ)
Q: Can SN74ALS645ADWR replace DM74ALS645AWM directly on the PCB?
A: Yes. SN74ALS645ADWR is a direct pin-compatible substitute with identical 20-SOIC (0.295", 7.50mm Width) package dimensions, electrical specifications, and functional characteristics. No PCB modifications are required.
Q: What is the difference between SN74ALS645ADWR and SN74ALS645A-1DWR?
A: Both parts are functionally equivalent with identical electrical specifications and 20-SOIC packaging. The primary difference is packaging format: SN74ALS645ADWR is supplied in Tape & Reel (TR), while SN74ALS645A-1DWR is also supplied in Tape & Reel. Both are active products from Texas Instruments.
Q: Why do some substitute parts show different output current specifications?
A: SN74ALS1645ANSR specifies 15mA, 16mA output current compared to the standard 15mA, 24mA. This represents a parametric variation within the 74ALS logic family. Substitution is not recommended if the 24mA low-side output current is a design requirement.
Q: Can I use SN74ALS645A-1NSR or SN74ALS645ANSR as substitutes?
A: These parts are electrically equivalent but use the 20-SO (0.209", 5.30mm Width) package instead of the standard 20-SOIC (0.295", 7.50mm Width). PCB footprint modification is required. Use only if layout redesign is feasible.
Q: What is the inventory status for recommended substitutes?
A: SN74ALS645ADWR has 1098 units in stock. SN74ALS645A-1DWR has 1106 units available. SN74ALS623ADW has 759 units. All recommended direct substitutes maintain adequate inventory for production continuity.
Q: Are all substitute parts RoHS compliant?
A: Yes. All Texas Instruments substitute parts listed carry ROHS3 compliance certification. The original onsemi DM74ALS645AWM is classified as obsolete and does not carry RoHS certification.
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