DS89C21TM Equivalent & Substitute Parts

Part Overview

The DS89C21TM is a 1/1 transceiver IC designed for full-duplex RS422 and RS485 serial communication applications. Manufactured by Texas Instruments in an 8-SOIC surface mount package, this component operates across industrial temperature ranges (-40°C to 85°C) with a maximum data rate of 20 Mbps. The DS89C21TM is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing system support.

Substiute Parts

DS89C21TM

Texas InstrumentsIn Stock: 1821DS89C21TM Datasheet

Current PartRFQ

DS89C21TM/NOPB

Texas InstrumentsIn Stock: 2219DS89C21TM/NOPB Datasheet

Parametric EquivalentRFQ

MAX3462ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1312MAX3462ESA+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS89C21TM is determined by strict equivalence across the following critical parameters:

• Protocol support: RS422 and RS485 full-duplex operation
• Driver/Receiver configuration: 1/1 topology
• Data rate capability: 20 Mbps minimum
• Package compatibility: 8-SOIC form factor with identical pin pitch (0.154", 3.90mm width)
• Supply voltage range: 4.5V to 5.5V nominal operation
• Operating temperature range: -40°C to 85°C
• Receiver hysteresis: 50 mV threshold

Two substitute parts meet these criteria: DS89C21TM/NOPB (Texas Instruments, active status) and MAX3462ESA+ (Analog Devices Inc./Maxim Integrated, active status). Both maintain identical electrical specifications and mechanical compatibility with the original DS89C21TM.

Parameter Comparison

Engineering Selection Recommendations

DS89C21TM/NOPB is the direct parametric equivalent from Texas Instruments with active product status and ROHS3 compliance. This part maintains identical electrical and mechanical specifications while offering improved regulatory compliance and ongoing manufacturer support.

MAX3462ESA+ from Analog Devices Inc./Maxim Integrated provides an alternative from a different manufacturer with equivalent functionality. The supply voltage range narrows to 4.75V ~ 5.25V compared to the original 4.5V ~ 5.5V specification. This part also carries ROHS3 compliance and active product status.

Both substitutes are pin-compatible and functionally equivalent for RS422/RS485 full-duplex transceiver applications requiring 20 Mbps data rates in 8-SOIC packages. Selection between DS89C21TM/NOPB and MAX3462ESA+ depends on supply chain availability, voltage margin requirements, and manufacturer preference within your design ecosystem.

Frequently Asked Questions (FAQ)

Q: Can DS89C21TM/NOPB directly replace DS89C21TM in existing designs?

A: Yes. DS89C21TM/NOPB is the same base product (DS89C21) with identical electrical specifications, pin configuration, and 8-SOIC package dimensions. The primary difference is product status (active vs. obsolete) and improved RoHS compliance.

Q: What is the difference between DS89C21TM and DS89C21TM/NOPB?

A: Both parts share identical core specifications. DS89C21TM/NOPB includes "/NOPB" designation indicating lead-free, RoHS3 compliant packaging. DS89C21TM is classified as obsolete while DS89C21TM/NOPB maintains active status with ongoing manufacturer support.

Q: Is MAX3462ESA+ a pin-for-pin replacement?

A: Yes. MAX3462ESA+ uses the same 8-SOIC package with identical pin pitch (0.154", 3.90mm width) and equivalent pinout for RS422/RS485 transceiver applications. Electrical specifications match across protocol support, data rate, operating temperature, and receiver hysteresis.

Q: What is the supply voltage difference between MAX3462ESA+ and the original DS89C21TM?

A: DS89C21TM operates across 4.5V ~ 5.5V while MAX3462ESA+ operates across 4.75V ~ 5.25V. The MAX3462ESA+ range is narrower by 0.25V on each end. Verify your power supply specifications support the 4.75V ~ 5.25V window before selecting MAX3462ESA+.

Q: Are both substitutes RoHS compliant?

A: Yes. Both DS89C21TM/NOPB and MAX3462ESA+ carry ROHS3 compliance. The original DS89C21TM is RoHS non-compliant, making these substitutes necessary for applications requiring regulatory compliance.

Q: Can I use these parts interchangeably in production?

A: DS89C21TM/NOPB and MAX3462ESA+ are functionally equivalent and mechanically compatible. However, they originate from different manufacturers. Verify component availability, lead times, and cost factors before committing to production quantities. Both maintain identical 8-SOIC package specifications and electrical performance for RS422/RS485 full-duplex transceiver applications.