SP385EET-L Equivalent & Substitute Parts

Part Overview

The SP385EET-L is a 2/2 full-duplex RS232 transceiver manufactured by MaxLinear, Inc., housed in an 18-SOIC surface mount package. This interface IC is designed for serial communication applications requiring bidirectional data transmission with full RS232 protocol compliance. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

Substiute Parts

SP385EET-L

MaxLinear, Inc.In Stock: 2421SP385EET-L Datasheet

Current PartRFQ

MAX222IDW

Texas InstrumentsIn Stock: 2001MAX222IDW Datasheet

MFR RecommendedRFQ

MAX222IDWR

Texas InstrumentsIn Stock: 1514MAX222IDWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SP385EET-L is determined by strict equivalence across the following critical parameters:

• Protocol Compatibility: RS232 full-duplex transceiver architecture
• Channel Configuration: 2 drivers and 2 receivers (2/2)
• Package Footprint: 18-SOIC surface mount package with identical 0.295" (7.50mm) width
• Receiver Hysteresis: 500 mV threshold specification
• Operating Temperature Range: -40°C to 85°C
• Supply Voltage Compatibility: Overlap within specified ranges

The MAX222IDW and MAX222IDWR from Texas Instruments meet these core substitution criteria. Both parts maintain identical channel configuration, package geometry, receiver hysteresis, and operating temperature specifications. The MAX222 series supports higher data rates (200 Kbps versus 120 Kbps) and operates within a narrower supply voltage window (4.5V ~ 5.5V), which represents a tighter specification suitable for applications within the SP385EET-L's 3V ~ 5V range.

Parameter Comparison

Engineering Selection Recommendations

Both MAX222IDW and MAX222IDWR are functionally equivalent substitutes for the SP385EET-L based on electrical and mechanical parameter alignment. Selection between these two options depends on packaging and supply chain requirements:

MAX222IDWR is the preferred substitute when cut tape or Digi-Reel packaging is required for automated assembly processes. This variant maintains REACH Unaffected status and provides 1,424 units in current inventory.

MAX222IDW serves as an alternative when standard packaging is acceptable. This variant carries REACH Affected status and maintains 1,900 units in inventory.

Both substitutes offer improved moisture sensitivity classification (MSL 2 versus MSL 3) and higher data rate capability (200 Kbps versus 120 Kbps), providing enhanced performance margins for new designs. The narrower supply voltage specification (4.5V ~ 5.5V) of the MAX222 series requires verification that system power supplies operate within this range; applications utilizing the full 3V ~ 5V range of the original SP385EET-L may require power supply adjustment.

Frequently Asked Questions (FAQ)

Q: Can MAX222IDW or MAX222IDWR be used as direct pin-for-pin replacements for SP385EET-L?

A: Yes. Both substitute parts maintain identical 18-SOIC package geometry, pinout configuration, and electrical interface specifications for 2/2 full-duplex RS232 transceiver operation. No PCB layout modifications are required.

Q: What is the primary difference between MAX222IDW and MAX222IDWR?

A: The primary difference is packaging format. MAX222IDWR is supplied in cut tape and Digi-Reel formats suitable for automated pick-and-place assembly. MAX222IDW uses standard packaging. Electrical specifications are identical.

Q: Does the narrower supply voltage range of MAX222 (4.5V ~ 5.5V) versus SP385EET-L (3V ~ 5V) create compatibility issues?

A: The MAX222 supply range is a subset of the original specification. Substitution is valid only for applications where system power supplies operate within 4.5V ~ 5.5V. Applications requiring operation below 4.5V require alternative solutions.

Q: Are there functional differences in data rate performance?

A: The MAX222 series supports 200 Kbps data rate compared to 120 Kbps for SP385EET-L. This represents enhanced capability and does not create backward compatibility issues. Applications designed for 120 Kbps operation will function correctly with the higher-rated substitute.

Q: What is the significance of the improved MSL rating (2 versus 3)?

A: MSL 2 (1 Year) provides extended shelf life and moisture tolerance compared to MSL 3 (168 Hours). This represents an improvement in component handling and storage flexibility for manufacturing operations.