SP491ECP-L Equivalent & Substitute Parts

Part Overview

The SP491ECP-L is a full-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in a 14-pin DIP package for through-hole mounting. This part operates at 4.75V to 5.25V with a receiver hysteresis of 70 mV and supports data rates up to 10 Mbps across an operating temperature range of -40°C to 85°C. The SP491ECP-L is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new design implementations where through-hole or surface-mount alternatives are preferred.

Key Parameters

Parameter	Value
Manufacturer Part Number	SP491ECP-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	70 mV
Data Rate	10 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SP491ECP-L is determined by the following critical parameters:

Protocol Compatibility: RS422/RS485 full-duplex transceiver functionality
Electrical Specifications: Supply voltage range 4.75V to 5.25V
Receiver Hysteresis: 70 mV (primary electrical characteristic)
Operating Temperature Range: -40°C to 85°C minimum
Package Type: 14-DIP through-hole or 14-SOIC surface-mount equivalents
Number of Drivers/Receivers: 1/1 configuration

Substitute parts are grouped into two categories:

Category 1: Direct Package Equivalents (14-DIP Through-Hole) Parts maintaining identical 14-DIP through-hole packaging with matching or superior electrical performance.

Category 2: Surface-Mount Alternative (14-SOIC) Parts offering equivalent functionality in surface-mount packaging for modern PCB designs.

Parameter Comparison

Part Number	Manufacturer	Protocol	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Mounting	Product Status
SP491ECP-L	MaxLinear, Inc.	RS422, RS485	70 mV	10 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-DIP	Through Hole	Obsolete
SP491ECN-L/TR	MaxLinear, Inc.	RS422, RS485	70 mV	10 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Surface Mount	Active
LTC491CN#PBF	Analog Devices Inc.	RS422, RS485	70 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	14-DIP	Through Hole	Active
LTC491IN#PBF	Analog Devices Inc.	RS422, RS485	70 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	14-DIP	Through Hole	Active
MAX491CPD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-DIP	Through Hole	Active
MAX491ECPD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-DIP	Through Hole	Active
MAX491EEPD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-DIP	Through Hole	Active
MAX491EPD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-DIP	Through Hole	Active
LT1791ACN#PBF	Analog Devices Inc.	RS422, RS485	20 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	14-DIP	Through Hole	Active
LT1791HN#PBF	Analog Devices Inc.	RS422, RS485	20 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 125°C	14-DIP	Through Hole	Active
SN65LBC180AN	Texas Instruments	RS422, RS485	50 mV	30 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-DIP	Through Hole	Obsolete

Engineering Selection Recommendations

Primary Recommendation: MAX491EEPD+ or MAX491EPD+

Both parts are manufactured by Analog Devices Inc./Maxim Integrated and maintain active product status. They provide identical receiver hysteresis (70 mV), matching supply voltage specifications (4.75V to 5.25V), and full operating temperature coverage (-40°C to 85°C). These parts are ROHS3 compliant and carry REACH Unaffected certification, meeting modern regulatory requirements. While data rate is reduced to 2.5 Mbps compared to the original 10 Mbps specification, this remains suitable for most RS422/RS485 applications.

Secondary Recommendation: LTC491IN#PBF

This Analog Devices part maintains 70 mV receiver hysteresis and -40°C to 85°C operating temperature range in 14-DIP through-hole packaging. It is ROHS3 compliant and REACH Unaffected. The part is currently in active production with 2200 units in stock.

Surface-Mount Alternative: SP491ECN-L/TR

For PCB designs requiring surface-mount components, the SP491ECN-L/TR offers identical electrical specifications to the original part in 14-SOIC packaging. Manufactured by MaxLinear, Inc., it maintains active product status with 9734 units in stock and is RoHS Compliant.

Extended Temperature Requirement: LT1791HN#PBF

If applications require extended temperature operation beyond -40°C to 85°C, the LT1791HN#PBF supports -40°C to 125°C. This part is ROHS3 compliant and REACH Unaffected, though it operates at reduced data rate (250 kbps) and lower receiver hysteresis (20 mV).

Frequently Asked Questions (FAQ)

Q: Can MAX491EEPD+ directly replace SP491ECP-L in existing designs?

A: Yes. Both parts share identical receiver hysteresis (70 mV), supply voltage range (4.75V to 5.25V), operating temperature (-40°C to 85°C), and 14-DIP through-hole packaging. The reduced data rate (2.5 Mbps vs. 10 Mbps) is not a functional limitation for most RS422/RS485 applications operating below this threshold.

Q: What is the difference between LTC491CN#PBF and LTC491IN#PBF?

A: Both parts are manufactured by Analog Devices Inc. with identical receiver hysteresis (70 mV) and 14-DIP packaging. The primary difference is operating temperature range: LTC491CN#PBF operates 0°C to 70°C, while LTC491IN#PBF extends to -40°C to 85°C. Select based on application temperature requirements.

Q: Why does SN65LBC180AN appear in the substitute list despite being obsolete?

A: SN65LBC180AN is listed as an available substitute based on electrical compatibility (RS422/RS485, 70 mV hysteresis equivalent via 50 mV specification, -40°C to 85°C operation). However, its obsolete status makes it unsuitable for new designs. Active alternatives such as MAX491EEPD+ or MAX491EPD+ are preferred.

Q: Is SP491ECN-L/TR suitable for through-hole PCB designs?

A: No. SP491ECN-L/TR is a surface-mount component in 14-SOIC packaging. For through-hole designs, select 14-DIP alternatives such as MAX491EEPD+, MAX491EPD+, or LTC491IN#PBF.

Q: What compliance certifications apply to substitute parts?

A: Most active substitute parts carry ROHS3 compliance and REACH Unaffected certification. SP491ECN-L/TR is RoHS Compliant. Verify specific certifications against your application requirements before final selection.

Q: Can LT1791HN#PBF be used in applications requiring 10 Mbps data rate?

A: No. LT1791HN#PBF operates at 250 kbps maximum data rate, significantly below the 10 Mbps specification of SP491ECP-L. This part is suitable only for low-speed RS422/RS485 applications. For higher data rates, select MAX491EEPD+, MAX491EPD+, or SN65LBC180AN.

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