SN75LP1185DW Equivalent & Substitute Parts

Part Overview

The SN75LP1185DW is a 3/5 Transceiver Full RS232 interface IC manufactured by Texas Instruments in a 20-SOIC surface mount package. This component is classified as Last Time Buy, indicating discontinued production status. The part operates within a supply voltage range of 4.75V to 5.25V and supports full-duplex RS232 communication with a receiver hysteresis of 1 V. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is necessary for ongoing design support and production continuity.

Substiute Parts

SN75LP1185DW

Texas InstrumentsIn Stock: 2828SN75LP1185DW Datasheet

Current PartRFQ

GD75232DBR

Texas InstrumentsIn Stock: 43310GD75232DBR Datasheet

MFR RecommendedRFQ

MAX3185CWP+

Analog Devices Inc./Maxim IntegratedIn Stock: 886MAX3185CWP+ Datasheet

MFR RecommendedRFQ

MAX3185CWP+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1044MAX3185CWP+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN75LP1185DW are identified based on the following critical parameters that determine functional equivalence:

• Protocol: RS232 full-duplex communication
• Driver/Receiver Configuration: 3/5 transceiver architecture
• Package Compatibility: 20-SOIC or 20-SSOP surface mount packages
• Supply Voltage Range: Minimum 4.75V operation capability
• Operating Temperature: 0°C to 70°C range
• Compliance: ROHS3 and REACH compliance status

Three substitute parts meet these criteria with varying packaging and performance characteristics. The MAX3185CWP+ and MAX3185CWP+T maintain identical package geometry (20-SOIC) with enhanced performance specifications. The GD75232DBR provides functional equivalence in a 20-SSOP package with different supply voltage flexibility.

Parameter Comparison

Engineering Selection Recommendations

Package-Matched Substitutes (20-SOIC):

MAX3185CWP+ and MAX3185CWP+T are direct package replacements for the SN75LP1185DW. Both parts maintain the identical 20-SOIC package geometry, enabling PCB-level compatibility without layout modifications. These parts are manufactured by Analog Devices Inc./Maxim Integrated and carry Active product status, ensuring long-term availability. The supply voltage range of 4.5V to 5.5V encompasses the original part's 4.75V to 5.25V specification. Both parts are ROHS3 compliant and carry MSL 1 rating. The MAX3185CWP+T is supplied in Tape & Reel packaging, while MAX3185CWP+ is supplied in Tube packaging.

Alternative Package Substitute (20-SSOP):

GD75232DBR provides functional equivalence with a different package footprint (20-SSOP). This part is manufactured by Texas Instruments and maintains Active product status. The 20-SSOP package is smaller than 20-SOIC, requiring PCB redesign if substitution is pursued. The supply voltage range of 5V with ±7.5V to 15V flexibility exceeds the original specification. This part is ROHS3 compliant and carries MSL 1 rating. GD75232DBR is supplied in Tape & Reel packaging.

All substitute parts maintain RS232 protocol compliance, 3/5 driver/receiver configuration, full-duplex operation, and 0°C to 70°C operating temperature range. All parts are REACH Unaffected and carry EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can MAX3185CWP+ be used as a direct replacement for SN75LP1185DW without PCB modifications?

A: Yes. Both parts use the 20-SOIC package with identical 0.295" width and 7.50mm dimensions. Pin-to-pin compatibility is maintained, allowing direct substitution on existing PCBs without layout changes.

Q: What is the difference between MAX3185CWP+ and MAX3185CWP+T?

A: Both parts are electrically identical with the same 20-SOIC package and specifications. The difference is packaging format: MAX3185CWP+ is supplied in Tube, while MAX3185CWP+T is supplied in Tape & Reel (TR). Selection depends on production volume and handling requirements.

Q: Why does GD75232DBR have a different supply voltage specification?

A: GD75232DBR supports a wider supply voltage range (5V, ±7.5V ~ 15V) compared to the original part (4.75V ~ 5.25V). This broader range provides additional design flexibility but does not affect compatibility in applications operating within the original voltage window.

Q: Can GD75232DBR be used as a drop-in replacement?

A: GD75232DBR cannot be used as a drop-in replacement due to package differences. The 20-SSOP package (0.209", 5.30mm width) is smaller than the 20-SOIC package (0.295", 7.50mm width), requiring PCB redesign and re-layout. Pin assignments must be verified before substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts (MAX3185CWP+, MAX3185CWP+T, and GD75232DBR) are ROHS3 compliant and REACH Unaffected, matching the compliance status of the original SN75LP1185DW.

Q: What is the significance of the Last Time Buy status for SN75LP1185DW?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part. Existing inventory may be available, but no future manufacturing is planned. Identifying and qualifying substitute parts is necessary for long-term design support and production continuity.