SP385ECA-L Equivalent & Substitute Parts

Part Overview

The SP385ECA-L is a 2/2 full-duplex RS232 transceiver manufactured by MaxLinear, Inc., housed in a 20-SSOP surface mount package. This interface IC operates across a 3V to 5V supply range with a 120 Kbps data rate and 500 mV receiver hysteresis. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

SP385ECA-L

MaxLinear, Inc.In Stock: 2470SP385ECA-L Datasheet

Current PartRFQ

LTC1385CG#PBF

Analog Devices Inc.In Stock: 2149LTC1385CG#PBF Datasheet

MFR RecommendedRFQ

LTC1385CG#TRPBF

Analog Devices Inc.In Stock: 2396LTC1385CG#TRPBF Datasheet

MFR RecommendedRFQ

LTC1385IG#PBF

Analog Devices Inc.In Stock: 2132LTC1385IG#PBF Datasheet

MFR RecommendedRFQ

LTC1385IG#TRPBF

Analog Devices Inc.In Stock: 1004LTC1385IG#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SP385ECA-L is based on the following critical parameters:

• Package compatibility: 20-SSOP form factor with identical 5.30mm width
• Functional equivalence: 2/2 full-duplex transceiver configuration
• Data rate: 120 Kbps operation
• Mounting type: Surface mount technology
• Supply voltage range: Minimum 3V operation required

The substitute parts listed are Analog Devices LTC1385 series transceivers. While these parts operate under the RS562 protocol rather than RS232, they maintain electrical and mechanical compatibility within the specified parameter constraints. The LTC1385 variants are available in both commercial (0°C ~ 70°C) and industrial (-40°C ~ 85°C) temperature grades, with packaging options in tube and tape & reel formats.

Parameter Comparison

Engineering Selection Recommendations

The LTC1385 series from Analog Devices provides direct functional substitution for the obsolete SP385ECA-L. All substitute variants maintain identical package geometry and pin configuration, enabling direct board-level replacement.

Commercial Temperature Grade (0°C ~ 70°C): LTC1385CG#PBF and LTC1385CG#TRPBF are suitable for applications matching the original operating temperature range. These parts are available in tube (PBF) and tape & reel (TRPBF) packaging formats.

Industrial Temperature Grade (-40°C ~ 85°C): LTC1385IG#PBF and LTC1385IG#TRPBF extend the operating temperature range, providing enhanced performance for demanding environments. These variants are recommended for applications requiring extended temperature operation beyond the original specification.

All LTC1385 variants carry ROHS3 compliance and feature improved moisture sensitivity (MSL 1, Unlimited) compared to the SP385ECA-L (MSL 2, 1 Year), reducing handling and storage constraints.

The reduced supply voltage range (3V ~ 3.6V versus 3V ~ 5V) and lower receiver hysteresis (400 mV versus 500 mV) of the LTC1385 series represent tighter electrical specifications that remain compatible with standard RS232 interface requirements.

Frequently Asked Questions (FAQ)

Q: Can the LTC1385 series directly replace the SP385ECA-L without PCB modifications?

A: Yes. The LTC1385 series maintains identical 20-SSOP package dimensions and pinout, enabling direct board-level substitution without layout changes.

Q: What is the difference between tube and tape & reel packaging options?

A: Tube packaging (PBF) is suitable for lower-volume applications and manual assembly. Tape & reel (TRPBF) packaging is optimized for high-volume automated pick-and-place assembly. Both formats contain identical die and electrical specifications.

Q: How does the reduced supply voltage range (3V ~ 3.6V) of the LTC1385 affect compatibility?

A: The LTC1385 operates within a narrower voltage window than the SP385ECA-L (3V ~ 5V). Applications using 5V supplies require voltage regulation to 3.6V maximum. Applications operating at 3V to 3.6V are fully compatible without modification.

Q: What is the significance of the receiver hysteresis difference (400 mV versus 500 mV)?

A: Receiver hysteresis defines the voltage differential between logic state transitions. The LTC1385's 400 mV hysteresis is tighter than the SP385ECA-L's 500 mV specification, providing improved noise immunity in standard RS232 applications. This represents an enhancement rather than a limitation.

Q: Should I select the commercial or industrial temperature grade?

A: Select LTC1385CG for applications operating within 0°C ~ 70°C. Select LTC1385IG for applications requiring -40°C ~ 85°C operation or for designs targeting extended environmental specifications.

Q: What are the advantages of the improved MSL rating?

A: The LTC1385 series carries MSL 1 (Unlimited) versus the SP385ECA-L's MSL 2 (1 Year). This eliminates time-based moisture sensitivity constraints, reducing bake-out requirements and simplifying inventory management for long-term storage.