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DM74ALS245AWMX Equivalent & Substitute Parts
Part Overview
The DM74ALS245AWMX is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability in a 20-SOIC package. This component operates within a 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional specification.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| 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) |
| Series | 74ALS |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the DM74ALS245AWMX is determined by strict equivalence across the following parameters: logic type (non-inverting transceiver), element count (1), bit width (8 bits per element), output configuration (3-state), output current specifications (15mA high, 24mA low), supply voltage range (4.5V to 5.5V), operating temperature range (0°C to 70°C), and package type (20-SOIC with 0.295" width).
Substitute parts are grouped into three categories based on their relationship to the main part:
Direct Manufacturer Equivalents maintain identical electrical and mechanical specifications with different packaging formats (Tube or Cut Tape & Digi-Reel).
Similar Parts share all core electrical parameters but may have minor package variations (20-SO with 0.209" width instead of 20-SOIC with 0.295" width).
Parametric Equivalents maintain all electrical specifications and primary package type but represent alternative base product numbers within the 74ALS transceiver family (74ALS645 series).
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements | Bits/Element | Output Type | Current (High/Low) | Supply Voltage | Temp Range | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM74ALS245AWMX | onsemi | Non-Inverting Transceiver | 1 | 8 | 3-State | 15mA / 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Obsolete | REACH Unaffected |
| SN74ALS245ADW | Texas Instruments | Non-Inverting Transceiver | 1 | 8 | 3-State | 15mA / 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Last Time Buy | ROHS3 Compliant |
| SN74ALS245ADWR | Texas Instruments | Non-Inverting Transceiver | 1 | 8 | 3-State | 15mA / 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Active | ROHS3 Compliant |
| SN74ALS245A-1DW | Texas Instruments | Non-Inverting Transceiver | 1 | 8 | 3-State | 15mA / 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Last Time Buy | ROHS3 Compliant |
| SN74ALS245A-1NSR | Texas Instruments | Non-Inverting Transceiver | 1 | 8 | 3-State | 15mA / 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SO (0.209") | Active | ROHS3 Compliant |
| SN74ALS245ANSR | Texas Instruments | Non-Inverting Transceiver | 1 | 8 | 3-State | 15mA / 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SO (0.209") | Active | ROHS3 Compliant |
| SN74ALS245A-1DWR | Texas Instruments | Non-Inverting Transceiver | 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 | Non-Inverting Transceiver | 1 | 8 | 3-State | 15mA / 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Active | ROHS3 Compliant |
| SN74ALS645ADWR | Texas Instruments | Non-Inverting Transceiver | 1 | 8 | 3-State | 15mA / 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (0.295") | Active | ROHS3 Compliant |
Engineering Selection Recommendations
For applications requiring the DM74ALS245AWMX, the following selection criteria apply based on product status and compliance:
Active Status Parts (SN74ALS245ADWR, SN74ALS245A-1NSR, SN74ALS245ANSR, SN74ALS245A-1DWR, SN74ALS645A-1DWR, SN74ALS645ADWR) are preferred for new designs and ongoing production due to current manufacturing availability and ROHS3 compliance certification.
Last Time Buy Status Parts (SN74ALS245ADW, SN74ALS245A-1DW) remain available in limited quantities and are suitable for legacy system support where existing inventory must be maintained.
Package Considerations: Parts designated with NSR suffix (SN74ALS245A-1NSR, SN74ALS245ANSR) feature 20-SO packaging with reduced width (0.209" versus 0.295"), which may require PCB layout verification for mechanical compatibility despite identical electrical specifications.
Tape & Reel Packaging (ADWR, A-1DWR, A-1NSR, ANSR suffixes) is standard for high-volume production environments, while Tube packaging (ADW, A-1DW) accommodates lower-volume or manual assembly operations.
Frequently Asked Questions (FAQ)
Q: Can SN74ALS245A-1NSR replace DM74ALS245AWMX directly?
A: SN74ALS245A-1NSR maintains all electrical specifications (logic type, bit width, output current, supply voltage, temperature range) but uses 20-SO packaging with 0.209" width instead of 20-SOIC with 0.295" width. PCB footprint compatibility must be verified before substitution.
Q: What is the difference between SN74ALS245 and SN74ALS645 variants?
A: Both maintain identical electrical parameters for this application. The base product number difference (245 versus 645) reflects alternative part designations within the 74ALS transceiver family, with equivalent functional performance for non-inverting transceiver operation.
Q: Are all Texas Instruments substitutes ROHS3 compliant?
A: All listed Texas Instruments substitute parts carry ROHS3 Compliant certification. The original onsemi DM74ALS245AWMX is listed as REACH Unaffected, which differs from active ROHS3 compliance status.
Q: Which substitute part has the longest product lifecycle?
A: SN74ALS245ADWR, SN74ALS245A-1NSR, SN74ALS245ANSR, SN74ALS245A-1DWR, SN74ALS645A-1DWR, and SN74ALS645ADWR all carry Active product status, indicating current manufacturing and ongoing availability. Last Time Buy status parts (SN74ALS245ADW, SN74ALS245A-1DW) have limited remaining lifecycle.
Q: Does packaging format affect electrical performance?
A: No. Tube, Cut Tape & Digi-Reel, and Tape & Reel packaging formats are logistics and assembly variants only. All parts with identical part numbers maintain identical electrical specifications regardless of packaging designation.
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