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DM74ALS245AWM Equivalent & Substitute Parts
Part Overview
The DM74ALS245AWM is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. Designed for 4.5V to 5.5V supply operation with 0°C to 70°C operating temperature range, this component is classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts from active manufacturers is essential for design continuity and procurement planning.
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 DM74ALS245AWM is determined by strict equivalence across the following critical parameters:
- Logic Type: Transceiver, Non-Inverting
- Number of Elements: 1
- Number of Bits per Element: 8
- Output Type: 3-State
- Current ratings: 15mA (High), 24mA (Low)
- Supply Voltage: 4.5V ~ 5.5V
- Operating Temperature: 0°C ~ 70°C
- Mounting Type: Surface Mount
- Package / Case: 20-SOIC or 20-SO variants
- Series: 74ALS
Substitute parts are grouped into three categories:
Direct Manufacturer Substitutes maintain identical electrical and mechanical specifications with different packaging formats (Tube, Cut Tape & Digi-Reel, Tape & Reel).
Similar Manufacturer Substitutes provide equivalent functionality with minor package variations (20-SO vs. 20-SOIC width differences).
Parametric Equivalents share all critical electrical parameters but may originate from different base product numbers within the 74ALS series (SN74ALS623, SN74ALS645).
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements / Bits | Output Type | Current (H/L) | Supply Voltage | Temp Range | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| DM74ALS245AWM | onsemi | Transceiver, Non-Inverting | 1 / 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (7.50mm) | Obsolete | REACH Unaffected |
| SN74ALS245ADW | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (7.50mm) | Last Time Buy | ROHS3 Compliant |
| SN74ALS245ADWR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (7.50mm) | Active | ROHS3 Compliant |
| SN74ALS245A-1DWR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SOIC (7.50mm) | Active | ROHS3 Compliant |
| SN74ALS245A-1NSR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SO (5.30mm) | Active | ROHS3 Compliant |
| SN74ALS245ANSR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 15mA, 24mA | 4.5V ~ 5.5V | 0°C ~ 70°C | 20-SO (5.30mm) | Active | 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 (7.50mm) | 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 (7.50mm) | 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 (7.50mm) | 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 (7.50mm) | Last Time Buy | ROHS3 Compliant |
Engineering Selection Recommendations
For applications currently using the obsolete DM74ALS245AWM, the following selection criteria apply:
For Long-Term Availability: SN74ALS245ADWR (Texas Instruments, Active status) provides direct electrical and mechanical equivalence with current production status and ROHS3 compliance. This part is available in Cut Tape & Digi-Reel packaging format.
For Identical Package Geometry: SN74ALS245ADW, SN74ALS245A-1DW, SN74ALS645A-1DW, and SN74ALS645ADW all maintain the 20-SOIC package with 7.50mm width, matching the original DM74ALS245AWM footprint. Among these, SN74ALS245ADWR and SN74ALS245A-1DWR offer Active product status.
For Compact PCB Layouts: SN74ALS245A-1NSR and SN74ALS245ANSR provide equivalent electrical performance in the narrower 20-SO package (5.30mm width), suitable for space-constrained designs. Both maintain Active status and ROHS3 compliance.
For Parametric Equivalence: SN74ALS623ADW and SN74ALS645A-1DW deliver identical electrical specifications within the 74ALS series, offering alternative sourcing options when primary substitutes are unavailable.
All recommended substitutes maintain supply voltage range (4.5V ~ 5.5V), output current ratings (15mA High, 24mA Low), operating temperature range (0°C ~ 70°C), and 3-state output functionality required for direct replacement.
Frequently Asked Questions (FAQ)
Q: Can SN74ALS245ADWR directly replace DM74ALS245AWM without circuit modification?
A: Yes. Both parts share identical electrical specifications (supply voltage, output current, logic type, bit configuration, and output type) and the same 20-SOIC package geometry. No circuit changes are required.
Q: What is the difference between 20-SOIC and 20-SO packages?
A: Both are 20-pin surface mount packages with identical pin configurations and electrical performance. The primary difference is package width: 20-SOIC measures 7.50mm width, while 20-SO measures 5.30mm width. PCB footprint compatibility depends on the original design specification. Verify your PCB layout before selecting a narrower package variant.
Q: Why are there multiple Texas Instruments part numbers with similar specifications?
A: Different part numbers reflect variations in base product series (74ALS245 vs. 74ALS623 vs. 74ALS645) and packaging formats (Tube, Cut Tape & Digi-Reel, Tape & Reel). All maintain identical electrical parameters and are functionally interchangeable. Selection depends on packaging preference and availability.
Q: Which substitute offers the best long-term availability?
A: SN74ALS245ADWR carries Active product status from Texas Instruments, indicating current production and ongoing availability. Parts marked "Last Time Buy" have limited remaining production windows.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All Texas Instruments substitutes listed carry ROHS3 compliance certification. The original DM74ALS245AWM is marked REACH Unaffected, and all substitutes maintain equivalent environmental compliance status.
Q: Can I mix different substitute part numbers in the same design?
A: Yes. All listed substitutes are parametrically equivalent and share identical electrical specifications. Mixing part numbers from different manufacturers or packaging formats within a single design is acceptable from an electrical standpoint, though procurement and inventory management may benefit from standardization.
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