SN75155P RS232 Transceiver - Equivalent & Substitute Parts

Part Overview

The SN75155P is a 1/1 full-duplex RS232 transceiver manufactured by Texas Instruments in an 8-DIP through-hole package. This device functions as a complete RS232 interface solution with integrated driver and receiver stages, operating across a 4.5V to 15V supply range with 600 mV receiver hysteresis. The SN75155P carries Last Time Buy status, indicating end-of-life production. Identifying qualified substitute components is essential for ongoing design support, production continuity, and long-term system reliability.

Substiute Parts

SN75155P

Texas InstrumentsIn Stock: 2142SN75155P Datasheet

Current PartRFQ

SN75155DR

Texas InstrumentsIn Stock: 4626SN75155DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75155P is determined by strict equivalence across the following electrical and mechanical parameters:

• Protocol Compatibility: Both main and substitute parts must implement RS232 full-duplex transceiver functionality
• Driver/Receiver Configuration: 1/1 driver/receiver stage count must be maintained
• Electrical Specifications: Supply voltage range (4.5V ~ 15V), receiver hysteresis (600 mV), and operating temperature range (0°C ~ 70°C) must be identical
• Manufacturer Continuity: Texas Instruments as the original manufacturer ensures design validation and long-term support
• Compliance Standards: RoHS3 compliance and REACH unaffected status must be preserved
• Base Product Number: The 75155 base product number indicates the same functional die across package variants

The SN75155DR qualifies as a direct substitute based on identical electrical performance and compliance certifications. The substitution involves a package change from through-hole (8-DIP) to surface-mount (8-SOIC), which is a mechanical consideration only and does not affect electrical functionality.

Parameter Comparison

Engineering Selection Recommendations

The SN75155DR is the qualified substitute for the SN75155P based on identical electrical specifications and regulatory compliance. Both parts share the same base product number (75155) and maintain full equivalence in RS232 transceiver functionality, supply voltage range, receiver hysteresis, and operating temperature specifications.

The primary distinction is product status and packaging format. The SN75155P operates under Last Time Buy status with through-hole mounting, while the SN75155DR maintains Active status with surface-mount packaging. For new designs or production transitions, the SN75155DR is the recommended selection due to its active manufacturing status and availability. For existing through-hole PCB designs, the SN75155P remains available while Last Time Buy inventory is in stock.

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment across applications. The electrical performance, pin functionality, and protocol implementation are identical between the two variants.

Frequently Asked Questions (FAQ)

Q: Can the SN75155DR directly replace the SN75155P in an existing design?

A: Electrical substitution is direct and complete. The SN75155DR implements identical RS232 transceiver functionality with the same supply voltage range, receiver hysteresis, and operating temperature specifications. However, the package change from 8-DIP (through-hole) to 8-SOIC (surface-mount) requires PCB layout modification. Pin-to-pin electrical functionality is preserved.

Q: What is the significance of the Last Time Buy status on the SN75155P?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of the SN75155P. Existing inventory is available for purchase, but no new manufacturing runs are planned. For long-term supply assurance, transition to the SN75155DR is recommended.

Q: Are there any electrical performance differences between the SN75155P and SN75155DR?

A: No. Both parts implement the same 75155 transceiver die with identical electrical specifications: 4.5V to 15V supply voltage, 600 mV receiver hysteresis, 1/1 driver/receiver configuration, and full-duplex RS232 operation across 0°C to 70°C operating temperature range.

Q: What packaging considerations apply when switching from SN75155P to SN75155DR?

A: The SN75155P uses 8-DIP through-hole packaging (0.300" width, 7.62mm), while the SN75155DR uses 8-SOIC surface-mount packaging (0.154" width, 3.90mm). PCB footprint, soldering process, and board layout must be updated accordingly. Pin assignments and electrical connections remain functionally equivalent.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the SN75155P and SN75155DR are ROHS3 compliant and REACH unaffected, ensuring equivalent regulatory status across applications.