SP3243EUER-L RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SP3243EUER-L is a full-duplex RS232 transceiver manufactured by MaxLinear, Inc., featuring 3 drivers and 5 receivers in a 32-QFN (5x5) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance. The part operates across 3V to 5.5V supply voltage with a 1 Mbps data rate and is suitable for surface mount applications requiring RS232 serial communication interfaces.

Key Parameters

Parameter	SP3243EUER-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Package	32-VFQFN Exposed Pad (5x5)
Voltage Supply	3V ~ 5.5V
Data Rate	1 Mbps
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	300 mV
Mounting Type	Surface Mount
Product Status	Obsolete
MSL Rating	2 (1 Year)

Substitute Part Grouping Explanation

Substitution eligibility for the SP3243EUER-L is determined by the following critical parameters:

Protocol Compatibility: RS232 full-duplex transceiver
Channel Configuration: 3 drivers and 5 receivers
Package Form Factor: 32-QFN (5x5) with exposed pad
Voltage Supply Range: 3V to 5.5V operation
Mounting Technology: Surface mount
Data Rate Capability: Minimum 1 Mbps support
Temperature Range: 0°C to 70°C minimum
Receiver Hysteresis: 300 mV or greater

Substitute parts are grouped into two categories based on package compatibility:

Category 1: Same Package (32-QFN 5x5) — Direct pin-compatible replacements maintaining identical footprint and pinout.

Category 2: Alternative Packages (28-SSOP, 28-SOIC, 28-TSSOP) — Functionally equivalent but requiring PCB layout redesign due to different package geometry and pin count.

Parameter Comparison

Part Number	Manufacturer	Package	Drivers/Receivers	Voltage Supply	Data Rate	Receiver Hysteresis	Operating Temp	Product Status	RoHS Compliance
SP3243EUER-L	MaxLinear	32-VFQFN (5x5)	3/5	3V ~ 5.5V	1 Mbps	300 mV	0°C ~ 70°C	Obsolete	Not specified
ISL3243EIRZ	Renesas Electronics	32-VFQFN (5x5)	3/5	2.7V ~ 3.6V	250 kbps	500 mV	-40°C ~ 85°C	Active	ROHS3 Compliant
ISL3243EIRZ-T	Renesas Electronics	32-VFQFN (5x5)	3/5	2.7V ~ 3.6V	250 kbps	500 mV	-40°C ~ 85°C	Active	ROHS3 Compliant
MAX3243CDBR	Texas Instruments	28-SSOP	3/5	3V ~ 5.5V	250 kbps	300 mV	0°C ~ 70°C	Active	ROHS3 Compliant
MAX3243CDW	Texas Instruments	28-SOIC	3/5	3V ~ 5.5V	250 kbps	300 mV	0°C ~ 70°C	Obsolete	ROHS3 Compliant
MAX3243CDWR	Texas Instruments	28-SOIC	3/5	3V ~ 5.5V	250 kbps	300 mV	0°C ~ 70°C	Active	ROHS3 Compliant
MAX3243CPW	Texas Instruments	28-TSSOP	3/5	3V ~ 5.5V	250 kbps	500 mV	0°C ~ 70°C	Obsolete	ROHS3 Compliant
MAX3243CPWR	Texas Instruments	28-TSSOP	3/5	3V ~ 5.5V	250 kbps	500 mV	0°C ~ 70°C	Active	ROHS3 Compliant
MAX3243ECPW	Texas Instruments	28-TSSOP	3/5	3V ~ 5.5V	500 kbps	500 mV	0°C ~ 70°C	Obsolete	ROHS3 Compliant
MAX3243ECPWR	Texas Instruments	28-TSSOP	3/5	3V ~ 5.5V	500 kbps	500 mV	0°C ~ 70°C	Active	ROHS3 Compliant
MAX3243ECRHBR	Texas Instruments	32-VFQFN (5x5)	3/5	3V ~ 5.5V	500 kbps	500 mV	0°C ~ 70°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MAX3243ECRHBR

The MAX3243ECRHBR is the optimal substitute for the SP3243EUER-L. Both parts share identical package geometry (32-VFQFN 5x5), identical voltage supply range (3V ~ 5.5V), identical operating temperature range (0°C ~ 70°C), and identical channel configuration (3/5). The MAX3243ECRHBR maintains active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The higher data rate (500 kbps vs. 1 Mbps) and increased receiver hysteresis (500 mV vs. 300 mV) provide enhanced noise immunity without compromising system compatibility. Pin-for-pin compatibility eliminates PCB redesign requirements.

Secondary Recommendation: ISL3243EIRZ or ISL3243EIRZ-T

The Renesas ISL3243 series offers same-package compatibility (32-VFQFN 5x5) with active product status and ROHS3 compliance. However, the voltage supply range is narrower (2.7V ~ 3.6V), limiting use to 3.3V systems. The extended operating temperature range (-40°C ~ 85°C) and higher receiver hysteresis (500 mV) provide advantages for industrial applications. The ISL3243EIRZ-T variant in tape-and-reel packaging supports high-volume production.

Alternative Recommendations: MAX3243 Series (28-Pin Packages)

For applications permitting PCB layout redesign, the MAX3243 series in 28-SSOP, 28-SOIC, or 28-TSSOP packages provides active alternatives. The MAX3243CDBR (28-SSOP) and MAX3243CDWR (28-SOIC) maintain identical electrical parameters to the original part. The MAX3243CPWR and MAX3243ECPWR (28-TSSOP) offer higher data rates (250 kbps and 500 kbps respectively) with enhanced receiver hysteresis. All variants carry ROHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can the MAX3243ECRHBR directly replace the SP3243EUER-L without PCB modifications?

A: Yes. Both parts use the 32-VFQFN (5x5) package with identical pinout and footprint. No PCB layout changes are required. The electrical parameters are compatible within the specified operating ranges.

Q: What is the key difference between the ISL3243EIRZ and MAX3243ECRHBR?

A: Both offer same-package compatibility and active product status. The primary difference is voltage supply range: ISL3243EIRZ operates at 2.7V ~ 3.6V (3.3V systems only), while MAX3243ECRHBR operates at 3V ~ 5.5V (broader compatibility). The ISL3243EIRZ provides extended temperature range (-40°C ~ 85°C) suitable for industrial environments.

Q: Why do the 28-pin alternatives have lower data rates than the original part?

A: The SP3243EUER-L specifies 1 Mbps in a 32-pin package. The 28-pin alternatives (MAX3243CDBR, MAX3243CDWR) specify 250 kbps due to different internal architecture and pin count constraints. The MAX3243ECPWR variant achieves 500 kbps in the same 28-TSSOP package.

Q: Are all substitute parts RoHS compliant?

A: The SP3243EUER-L does not specify RoHS status. All recommended substitutes (ISL3243EIRZ, MAX3243 series) carry ROHS3 compliance, meeting current regulatory requirements for new designs and production.

Q: What packaging options are available for high-volume production?

A: ISL3243EIRZ-T and MAX3243ECRHBR are supplied in tape-and-reel (TR) packaging for automated assembly. MAX3243CDBR and MAX3243CPWR are available in cut-tape (CT) with Digi-Reel options. Tube packaging is available for lower-volume requirements.

Q: Can I use a 28-pin substitute if my PCB currently uses the 32-pin package?

A: No. The 28-pin packages (28-SSOP, 28-SOIC, 28-TSSOP) have different pinouts and footprints. PCB redesign is required, including schematic updates and layout modifications. Use 28-pin alternatives only for new designs or redesigned boards.

Q: What is the moisture sensitivity level (MSL) for substitute parts?

A: The SP3243EUER-L and all recommended substitutes carry MSL 2 (1 Year) rating, indicating identical moisture handling requirements and storage conditions.

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