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SN74AS194D Equivalent & Substitute Parts
Part Overview
The SN74AS194D is a bidirectional universal shift register manufactured by Texas Instruments, designed for 4-bit parallel data manipulation in logic applications. This component operates within a 4.5V to 5.5V supply voltage range and supports both serial and parallel data loading with directional control. The SN74AS194D is classified as Last Time Buy, indicating discontinued production. Identifying equivalent substitute parts is essential for ongoing system maintenance, design updates, and procurement continuity when original stock becomes unavailable.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SN74AS194D |
| Manufacturer | Texas Instruments |
| Logic Type | Register, Bidirectional |
| Number of Bits per Element | 4 |
| Function | Universal |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Output Type | Push-Pull |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the SN74AS194D is determined by the following critical parameters:
- Logic Type & Function: Must be Register, Bidirectional with Universal function capability
- Bit Configuration: Must support 4-bit per element architecture
- Voltage Supply Range: Must operate within 4.5V to 5.5V
- Operating Temperature Range: Must support 0°C to 70°C minimum
- Package Compatibility: Must use 16-SOIC form factor with identical pin configuration
- Output Characteristics: Must provide Push-Pull output type
- Compliance Standards: Must maintain ROHS3 compliance and MSL Level 1 rating
The SN74AS194DR qualifies as a direct substitute based on identical electrical specifications, package geometry, and functional characteristics. The primary distinction is packaging format: the SN74AS194D is supplied in Tube packaging, while the SN74AS194DR is supplied in Tape & Reel format. Both components share the same base product number (74AS194) and are manufactured by Texas Instruments.
Parameter Comparison
| Parameter | SN74AS194D (Main Part) | SN74AS194DR (Substitute) |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Logic Type | Register, Bidirectional | Register, Bidirectional |
| Number of Bits per Element | 4 | 4 |
| Function | Universal | Universal |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) | 16-SOIC (0.154", 3.90mm Width) |
| Output Type | Push-Pull | Push-Pull |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| Packaging Format | Tube | Tape & Reel (TR) |
| Product Status | Last Time Buy | Active |
Engineering Selection Recommendations
The SN74AS194DR is a direct functional equivalent to the SN74AS194D. Both components are manufactured by Texas Instruments and share identical electrical specifications, pin configurations, and package dimensions. The SN74AS194DR maintains Active product status, ensuring continued availability and manufacturing support, whereas the SN74AS194D is designated Last Time Buy. Both parts maintain ROHS3 compliance and MSL Level 1 certification, meeting environmental and reliability standards.
Selection between these parts should be based on procurement requirements: the SN74AS194DR in Tape & Reel format is suitable for automated assembly processes and high-volume production, while the SN74AS194D in Tube packaging may be appropriate for lower-volume or manual assembly applications. The electrical and functional performance of both components is identical.
Frequently Asked Questions (FAQ)
Q: Can the SN74AS194DR replace the SN74AS194D in existing designs?
A: Yes. The SN74AS194DR is a direct substitute with identical electrical specifications, pin configuration, and 16-SOIC package dimensions. No circuit modifications are required.
Q: What is the difference between Tube and Tape & Reel packaging?
A: Tube packaging contains loose components suitable for manual handling and lower-volume applications. Tape & Reel packaging presents components in a continuous carrier tape for automated pick-and-place assembly. Both formats contain the same component with identical specifications.
Q: Are both parts RoHS compliant?
A: Yes. Both the SN74AS194D and SN74AS194DR are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating.
Q: Why is the SN74AS194D marked as Last Time Buy?
A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. The SN74AS194DR, with Active status, represents the current manufacturing equivalent and is recommended for new designs and ongoing procurement.
Q: Are the pin configurations identical between both parts?
A: Yes. Both components use the 16-SOIC package with identical pin assignments, voltage levels, and signal characteristics.
Q: What supply voltage range do these components support?
A: Both the SN74AS194D and SN74AS194DR operate within a 4.5V to 5.5V supply voltage range and support operating temperatures from 0°C to 70°C.
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