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SN74LS259BD Equivalent & Substitute Parts
Part Overview
The SN74LS259BD is an 8-bit addressable latch IC manufactured by Texas Instruments, classified as a D-Type, Addressable logic component with a 1:8 circuit configuration. This device is designated as Last Time Buy, indicating discontinued production with limited availability. The part is housed in a 16-SOIC surface mount package and operates within the 4.75V to 5.25V supply voltage range. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term component sourcing.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SN74LS259BD |
| Manufacturer | Texas Instruments |
| Logic Type | D-Type, Addressable |
| Circuit Configuration | 1:8 |
| Output Type | Standard |
| Voltage - Supply | 4.75V ~ 5.25V |
| Delay Time - Propagation | 19ns |
| Current - Output High, Low | 400µA, 8mA |
| Operating Temperature | 0°C ~ 70°C |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
| Product Status | Last Time Buy |
Substitute Part Grouping Explanation
Substitution of the SN74LS259BD is determined by strict equivalence across the following critical parameters:
- Logic Type and Circuit Configuration: D-Type, Addressable 1:8 topology
- Electrical Performance: 4.75V ~ 5.25V supply voltage, 19ns propagation delay, 400µA/8mA output current specifications
- Package Compatibility: 16-SOIC surface mount form factor with identical pin configuration
- Environmental and Compliance Standards: ROHS3 compliance, MSL Level 1, REACH Unaffected status
The SN74LS259BDR qualifies as a direct substitute based on identical electrical specifications, package geometry, and compliance certifications. The primary distinction is packaging format: the main part uses Tube packaging, while the substitute employs Tape & Reel (TR) format. Both parts maintain the same functional performance and are sourced from the same manufacturer.
Parameter Comparison
| Parameter | SN74LS259BD (Main) | SN74LS259BDR (Substitute) |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Logic Type | D-Type, Addressable | D-Type, Addressable |
| Circuit Configuration | 1:8 | 1:8 |
| Output Type | Standard | Standard |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Delay Time - Propagation | 19ns | 19ns |
| Current - Output High, Low | 400µA, 8mA | 400µA, 8mA |
| 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) |
| Mounting Type | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
| Packaging Format | Tube | Tape & Reel (TR) |
| Product Status | Last Time Buy | Active |
Engineering Selection Recommendations
The SN74LS259BDR is a direct functional equivalent to the SN74LS259BD. Both parts are manufactured by Texas Instruments and maintain identical electrical performance specifications, package geometry, and compliance certifications. The SN74LS259BDR holds Active product status, ensuring continued availability and supply chain stability compared to the Last Time Buy designation of the main part.
The distinction between these parts is limited to packaging format. The SN74LS259BD is supplied in Tube packaging, while the SN74LS259BDR is supplied in Tape & Reel (TR) format. This difference affects handling, storage, and automated assembly processes but does not impact electrical performance or functional compatibility.
For new designs or long-term production requirements, the SN74LS259BDR is the preferred selection due to its Active status and standard automated assembly compatibility via Tape & Reel packaging.
Frequently Asked Questions (FAQ)
Q: Are the SN74LS259BD and SN74LS259BDR electrically identical?
A: Yes. Both parts share identical electrical specifications, including supply voltage range (4.75V ~ 5.25V), propagation delay (19ns), output current ratings (400µA, 8mA), and operating temperature range (0°C ~ 70°C).
Q: What is the difference between Tube and Tape & Reel packaging?
A: Tube packaging supplies components in plastic tubes suitable for manual handling and small-quantity applications. Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, optimized for automated pick-and-place assembly equipment. Both formats contain the same component in the same 16-SOIC package.
Q: Can I use the SN74LS259BDR as a direct replacement for the SN74LS259BD?
A: Yes, the SN74LS259BDR is a direct functional substitute. Pin configuration, electrical performance, and package dimensions are identical. Compatibility depends only on your assembly process capability to handle Tape & Reel format if switching from Tube packaging.
Q: Why is the SN74LS259BD marked as Last Time Buy?
A: Last Time Buy status indicates Texas Instruments has discontinued production of this part number. The SN74LS259BDR, with Active status, represents the current production equivalent and is recommended for new designs and ongoing production requirements.
Q: Are both parts RoHS and REACH compliant?
A: Yes. Both the SN74LS259BD and SN74LS259BDR are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.
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