SN75188NS Equivalent & Substitute Parts

Part Overview

The SN75188NS is a 4/0 Driver RS232 interface IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This component functions as an RS232 line driver for serial communication applications. The SN75188NS carries a Last Time Buy product status, indicating that this specific part number variant is being discontinued. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Substiute Parts

SN75188NS

Texas InstrumentsIn Stock: 2383SN75188NS Datasheet

Current PartRFQ

SN75188DR

Texas InstrumentsIn Stock: 18209SN75188DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75188NS is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Protocol: RS232
• Driver/Receiver Configuration: 4/0 (4 drivers, 0 receivers)
• Type: Driver IC

Electrical Parameters:

• Supply Voltage Range: ±7.5V ~ 15V
• Operating Temperature Range: 0°C ~ 70°C

Physical Parameters:

• Mounting Type: Surface Mount
• Package Family: 14-SOIC

Compliance Parameters:

• RoHS3 Compliance
• Moisture Sensitivity Level: 1

The SN75188DR qualifies as a direct substitute because it maintains identical electrical specifications, functional configuration, and compliance certifications. The primary difference is packaging format (Cut Tape/Digi-Reel versus tube packaging) and product status (Active versus Last Time Buy).

Parameter Comparison

Engineering Selection Recommendations

SN75188DR Selection Rationale:

The SN75188DR is the primary substitute for the SN75188NS based on functional and electrical equivalence. Both parts share identical RS232 protocol implementation, 4/0 driver/receiver configuration, and supply voltage specifications. Both components maintain ROHS3 compliance and MSL Level 1 moisture sensitivity ratings, ensuring compatibility with current manufacturing and environmental standards.

The SN75188DR carries Active product status, providing assured long-term availability compared to the Last Time Buy status of the SN75188NS. This substitution is appropriate for new designs and ongoing production requirements.

Package Consideration:

While both parts utilize 14-SOIC surface mount packages, dimensional variations exist (0.209" versus 0.154" width). PCB layout compatibility must be verified for existing designs before implementation.

Frequently Asked Questions (FAQ)

Q: Can the SN75188DR directly replace the SN75188NS in existing designs?

A: The SN75188DR provides electrical and functional equivalence. However, PCB footprint compatibility must be confirmed due to package width differences (5.30mm versus 3.90mm). Existing PCB layouts designed for the SN75188NS may require modification to accommodate the SN75188DR package dimensions.

Q: What is the significance of the Last Time Buy status for the SN75188NS?

A: Last Time Buy status indicates that Texas Instruments will discontinue production of this specific part number variant. Existing inventory will be depleted without replenishment. The SN75188DR, with Active status, represents the recommended path for continued supply.

Q: Are the electrical specifications identical between SN75188NS and SN75188DR?

A: Yes. Both parts operate within the ±7.5V to 15V supply range, support 0°C to 70°C operating temperatures, and implement identical RS232 4/0 driver configurations. Electrical performance is equivalent.

Q: What packaging formats are available for the SN75188DR?

A: The SN75188DR is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for both manual assembly and automated reel-fed production processes.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN75188NS and SN75188DR are ROHS3 compliant and carry MSL Level 1 moisture sensitivity ratings, meeting current environmental and manufacturing standards.