DS14C89AM/NOPB Equivalent & Substitute Parts

Part Overview

The DS14C89AM/NOPB is a 0/4 Receiver RS232 interface IC manufactured by Texas Instruments in a 14-SOIC package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The part operates with 5V and 12V supply voltages and is suitable for RS232 communication applications requiring receiver functionality. Due to its obsolete status, active alternatives from both Texas Instruments and Analog Devices Inc./Maxim Integrated are available to maintain design continuity.

Substiute Parts

DS14C89AM/NOPB

Texas InstrumentsIn Stock: 1265DS14C89AM/NOPB Datasheet

Current PartRFQ

SN75C189ADBR

Texas InstrumentsIn Stock: 31816SN75C189ADBR Datasheet

MFR RecommendedRFQ

MAX1489ECSD+

Analog Devices Inc./Maxim IntegratedIn Stock: 12849MAX1489ECSD+ Datasheet

MFR RecommendedRFQ

MAX1489ECSD+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1397MAX1489ECSD+T Datasheet

MFR RecommendedRFQ

MAX1489EESD+

Analog Devices Inc./Maxim IntegratedIn Stock: 1490MAX1489EESD+ Datasheet

MFR RecommendedRFQ

MAX1489EESD+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3313MAX1489EESD+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS14C89AM/NOPB is determined by the following critical parameters:

Primary Compatibility Criteria:

• Protocol: RS232
• Type: Receiver
• Number of Drivers/Receivers: 0/4
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• MSL Rating: 1 (Unlimited)

Package Compatibility: Substitutes are grouped into two package categories:

1. 14-SOIC Package (Direct Pin-Compatible): MAX1489ECSD+, MAX1489ECSD+T, MAX1489EESD+, MAX1489EESD+T — identical footprint to the original part
2. 14-SSOP Package (Alternative Package): SN75C189ADBR — different footprint requiring PCB layout modification

Electrical Parameter Variations:

• Receiver Hysteresis: Ranges from 970 mV to 1.11 V (minor variation acceptable for RS232 applications)
• Voltage - Supply: Substitute parts operate within 4.5V ~ 6V or 4.5V ~ 5.5V ranges (compatible with original 5V operation)
• Data Rate: MAX1489 series specifies 120Kbps; original part does not specify data rate
• Operating Temperature: Extended range options available (-40°C ~ 85°C for MAX1489EESD+ variants)

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (Recommended): Select MAX1489ECSD+, MAX1489ECSD+T, MAX1489EESD+, or MAX1489EESD+T. These parts maintain the 14-SOIC package footprint, eliminating PCB layout modifications. All are active products with ROHS3 compliance and MSL 1 rating. The MAX1489EESD+ and MAX1489EESD+T variants offer extended operating temperature range (-40°C ~ 85°C) for applications requiring wider temperature support beyond the original 0°C ~ 70°C specification.

For Alternative Package Solution: SN75C189ADBR from Texas Instruments provides 14-SSOP packaging and maintains RS232 receiver functionality with 0/4 configuration. This option requires PCB layout redesign due to different package dimensions (0.209" vs. 0.154" width). Select this only when PCB modification is acceptable and Texas Instruments sourcing is preferred.

Supply Voltage Consideration: The original DS14C89AM/NOPB supports 5V and 12V supplies. Substitute parts operate within narrower ranges (4.5V ~ 6V for SN75C189ADBR; 4.5V ~ 5.5V for MAX1489 series). Verify that your design operates within these specified ranges. For 12V-only applications, SN75C189ADBR provides the broader 4.5V ~ 6V range.

Compliance and Certification: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) rating, matching the original part's environmental and handling specifications.

Frequently Asked Questions (FAQ)

Q: Can MAX1489ECSD+ directly replace DS14C89AM/NOPB without PCB changes? A: Yes. Both parts use the 14-SOIC package with identical 0.154" width and pin configuration. No PCB layout modification is required for pin-compatible substitutes (MAX1489ECSD+, MAX1489ECSD+T, MAX1489EESD+, MAX1489EESD+T).

Q: What is the difference between MAX1489ECSD+ and MAX1489EESD+? A: The primary difference is operating temperature range. MAX1489ECSD+ operates 0°C ~ 70°C (matching the original part), while MAX1489EESD+ operates -40°C ~ 85°C (extended range). Both maintain identical receiver hysteresis (1.11 V), data rate (120Kbps), and supply voltage (4.5V ~ 5.5V).

Q: Why does SN75C189ADBR use a different package? A: SN75C189ADBR uses 14-SSOP packaging (0.209" width) instead of 14-SOIC (0.154" width). While functionally equivalent for RS232 receiver applications, the different package requires PCB footprint redesign.

Q: Is the receiver hysteresis difference (1 V vs. 970 mV vs. 1.11 V) significant? A: For RS232 applications, these hysteresis variations (970 mV to 1.11 V) are within acceptable tolerances and do not affect functional compatibility. RS232 signal levels are typically ±5V to ±15V, making these small hysteresis differences negligible.

Q: Can I use MAX1489 parts in a 12V supply application? A: No. MAX1489 series parts specify 4.5V ~ 5.5V supply voltage and are not rated for 12V operation. For 12V applications, use SN75C189ADBR (4.5V ~ 6V rating) or verify your design operates within the 5V range.

Q: What packaging options are available for inventory? A: MAX1489ECSD+ is available in Tube packaging (12,800 Pcs). MAX1489ECSD+T is available in Cut Tape (CT) & Digi-Reel® packaging (1,327 Pcs). MAX1489EESD+ is available in Tube packaging (1,475 Pcs). MAX1489EESD+T is available in standard packaging (3,233 Pcs). SN75C189ADBR is available with 31,740 Pcs in stock.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (SN75C189ADBR, MAX1489ECSD+, MAX1489ECSD+T, MAX1489EESD+, MAX1489EESD+T) are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the original DS14C89AM/NOPB specifications.