DS9638CM Equivalent & Substitute Parts

Part Overview

The DS9638CM is a 2/0 Driver RS422/RS485 interface IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This component is classified as Obsolete, making it necessary to identify functionally equivalent alternatives for new designs and ongoing production requirements. The DS9638CM operates within a 4.75V to 5.25V supply voltage range and supports operating temperatures from 0°C to 70°C.

Substiute Parts

DS9638CM

Texas InstrumentsIn Stock: 1397DS9638CM Datasheet

Current PartRFQ

SN75158D

Texas InstrumentsIn Stock: 2539SN75158D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS9638CM is determined by strict equivalence across the following critical parameters:

• Protocol support: RS422 and RS485 compatibility
• Driver/Receiver configuration: 2/0 (2 drivers, 0 receivers)
• Package type: 8-SOIC surface mount form factor
• Supply voltage range: 4.75V to 5.25V
• Operating temperature range: 0°C to 70°C
• Electrical pin compatibility and functional pinout alignment

The SN75158D meets all these criteria and is identified as the manufacturer-recommended substitute. Both components share identical electrical specifications, package dimensions, and functional characteristics within the specified operating parameters.

Parameter Comparison

Engineering Selection Recommendations

The SN75158D is the direct functional equivalent for the obsolete DS9638CM. Both components are manufactured by Texas Instruments and provide identical electrical performance within the specified operating parameters. The SN75158D offers improved compliance status, as it is ROHS3 compliant compared to the non-compliant DS9638CM, making it the preferred choice for new designs and production applications subject to environmental regulations. The SN75158D maintains Last Time Buy status, indicating continued availability through authorized distribution channels. Both components share identical package geometry, supply voltage requirements, and temperature operating ranges, ensuring direct pin-compatible substitution without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the SN75158D be used as a direct replacement for the DS9638CM?

A: Yes. The SN75158D is functionally equivalent to the DS9638CM across all critical parameters: identical 2/0 driver/receiver configuration, RS422/RS485 protocol support, 8-SOIC package form factor, 4.75V to 5.25V supply voltage range, and 0°C to 70°C operating temperature range. Pin compatibility and electrical characteristics are identical.

Q: What is the difference in product status between these components?

A: The DS9638CM is classified as Obsolete, indicating end-of-life status and unavailability from standard distribution channels. The SN75158D is designated Last Time Buy, meaning limited quantities remain available before complete discontinuation. For ongoing production, the SN75158D should be selected.

Q: Are there compliance differences between the two parts?

A: Yes. The SN75158D is ROHS3 compliant, while the DS9638CM is RoHS non-compliant. Both maintain REACH Unaffected and EAR99 ECCN classifications. For applications requiring environmental compliance, the SN75158D is the appropriate selection.

Q: Is the 8-SOIC package identical for both components?

A: Yes. Both the DS9638CM and SN75158D use the 8-SOIC package with 0.154" (3.90mm) width specifications. No PCB layout modifications are required for substitution.

Q: What is the moisture sensitivity level for these components?

A: Both components have MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.