DS8921AMX Equivalent & Substitute Parts

Part Overview

The DS8921AMX is a 1/1 transceiver IC for RS422 and RS485 serial communication protocols, housed in an 8-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements. The availability of direct substitutes with identical electrical and mechanical specifications ensures continuity in applications requiring full-duplex RS422/RS485 interface functionality.

Substiute Parts

DS8921AMX

Texas InstrumentsIn Stock: 2005DS8921AMX Datasheet

Current PartRFQ

DS8921AMX/NOPB

Texas InstrumentsIn Stock: 4708DS8921AMX/NOPB Datasheet

DirectRFQ

DS8921MX/NOPB

Texas InstrumentsIn Stock: 25471DS8921MX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS8921AMX is determined by strict equivalence across the following critical parameters:

• Protocol support: RS422 and RS485 full-duplex operation
• Electrical specifications: 1/1 driver/receiver configuration, 70 mV receiver hysteresis, 4.5V to 5.5V supply voltage range
• Operating temperature range: 0°C to 70°C
• Package specification: 8-SOIC form factor with 0.154" (3.90mm) width
• Pin-compatible base product number: DS8921

The identified substitutes maintain identical electrical and mechanical characteristics, differing only in product status (active vs. obsolete) and packaging format (Tape & Reel vs. standard packaging). Both substitute parts are manufactured by Texas Instruments and comply with current RoHS3 standards.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production applications, DS8921MX/NOPB is the preferred substitute. This part maintains full electrical and mechanical compatibility with the obsolete DS8921AMX while offering active product status and ROHS3 compliance. The Tape & Reel packaging format supports automated assembly processes typical in high-volume manufacturing.

DS8921AMX/NOPB serves as an alternative direct substitute with identical specifications and active status. Selection between DS8921MX/NOPB and DS8921AMX/NOPB should be based on inventory availability and packaging requirements for your specific production workflow.

Both substitutes eliminate the obsolescence risk associated with the original DS8921AMX while maintaining full functional and physical compatibility in RS422/RS485 serial communication applications.

Frequently Asked Questions (FAQ)

Q: Can DS8921MX/NOPB replace DS8921AMX in existing designs?

A: Yes. Both parts are pin-compatible, electrically identical, and housed in the same 8-SOIC package. No circuit modifications are required.

Q: What is the difference between DS8921AMX/NOPB and DS8921MX/NOPB?

A: Both are active substitutes with identical electrical specifications. The primary difference is product designation within the DS8921 base product family. DS8921MX/NOPB has higher inventory availability (25,400 units vs. 4,609 units).

Q: Why is the original DS8921AMX marked as obsolete?

A: Obsolescence indicates the part is no longer in active production. Texas Instruments has transitioned to the active variants DS8921AMX/NOPB and DS8921MX/NOPB to support current market demand and compliance requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both DS8921AMX/NOPB and DS8921MX/NOPB are ROHS3 compliant, whereas the original DS8921AMX is RoHS non-compliant.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel packaging (TR) is a distribution format only and does not alter electrical characteristics or performance. It is optimized for automated assembly processes.

Q: Are all three parts suitable for RS422 and RS485 applications?

A: Yes. All three parts support both RS422 and RS485 protocols with identical full-duplex transceiver functionality, 1/1 driver/receiver configuration, and 70 mV receiver hysteresis.