XR3178EID-F RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The XR3178EID-F is a half-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This interface IC supports 1/1 driver/receiver configuration with a 20 Mbps data rate and operates across a 3V to 3.6V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	XR3178EID-F
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS422, RS485
Duplex Configuration	Half
Number of Drivers/Receivers	1/1
Data Rate	20 Mbps
Receiver Hysteresis	25 mV
Voltage Supply Range	3V to 3.6V
Operating Temperature Range	-40°C to 85°C
Package/Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the XR3178EID-F is determined by strict adherence to the following critical parameters:

Primary Substitution Criteria:

Protocol: RS422/RS485 half-duplex operation
Number of Drivers/Receivers: 1/1 configuration
Package/Case: 8-SOIC form factor (0.154", 3.90mm Width)
Voltage Supply Range: 3V to 3.6V
Operating Temperature Range: -40°C to 85°C minimum
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Data Rate: 20 Mbps or higher
Receiver Hysteresis: 25 mV or lower (lower values indicate tighter input thresholds)

Substitute parts are grouped into two categories: parametric equivalents (matching all primary criteria with identical electrical performance) and manufacturer-recommended alternatives (meeting primary criteria with minor electrical variations that do not affect functional compatibility in standard RS422/RS485 applications).

Parameter Comparison

Part Number	Manufacturer	Protocol	Duplex	Data Rate	Receiver Hysteresis	Supply Voltage	Temp Range	Package	Product Status	MSL
XR3178EID-F	MaxLinear, Inc.	RS422, RS485	Half	20 Mbps	25 mV	3V–3.6V	-40°C to 85°C	8-SOIC	Obsolete	1
XR3078XID-F	MaxLinear, Inc.	RS422, RS485	Half	20 Mbps	25 mV	3V–3.6V	-40°C to 85°C	8-SOIC	Active	1
ISL3172EIBZ-T7A	Renesas Electronics	RS422, RS485	Half	250 kbps	15 mV	3V–3.6V	-40°C to 85°C	8-SOIC	Active	3
ISL3178EIBZ	Renesas Electronics	RS422, RS485	Half	20 Mbps	15 mV	3V–3.6V	-40°C to 85°C	8-SOIC	Active	3
ISL3178EIBZ-T	Renesas Electronics	RS422, RS485	Half	20 Mbps	15 mV	3V–3.6V	-40°C to 85°C	8-SOIC	Active	3
ISL3178EIBZ-T7A	Renesas Electronics	RS422, RS485	Half	20 Mbps	15 mV	3V–3.6V	-40°C to 85°C	8-SOIC	Active	3
ISL83072EIBZA-T7A	Renesas Electronics	RS422, RS485	Half	250 kbps	15 mV	3V–3.6V	-40°C to 85°C	8-SOIC	Active	3
SN65HVD11D	Texas Instruments	RS422, RS485	Half	10 Mbps	35 mV	3V–3.6V	-40°C to 85°C	8-SOIC	Obsolete	1
SN65HVD11DR	Texas Instruments	RS422, RS485	Half	10 Mbps	35 mV	3V–3.6V	-40°C to 85°C	8-SOIC	Active	1
SN65HVD11QD	Texas Instruments	RS422, RS485	Half	10 Mbps	35 mV	3V–3.6V	-40°C to 85°C to 125°C	8-SOIC	Obsolete	1

Engineering Selection Recommendations

Direct Parametric Equivalent: XR3078XID-F is the primary substitute for XR3178EID-F. Both parts share identical electrical specifications (20 Mbps data rate, 25 mV receiver hysteresis, 3V–3.6V supply, -40°C to 85°C operating range) and 8-SOIC packaging. XR3078XID-F is currently in active production status, ensuring long-term availability and supply chain continuity.

Manufacturer-Recommended Alternatives (Renesas ISL Series): ISL3178EIBZ, ISL3178EIBZ-T, and ISL3178EIBZ-T7A are functionally compatible substitutes from Renesas Electronics. These parts maintain the 20 Mbps data rate and identical supply/temperature specifications. The receiver hysteresis is 15 mV (tighter than the original 25 mV), which provides improved noise immunity without affecting compatibility. All three variants are in active production with ROHS3 compliance and MSL 3 rating. Selection among these variants depends on packaging requirements: ISL3178EIBZ (Tube), ISL3178EIBZ-T (Cut Tape & Digi-Reel), or ISL3178EIBZ-T7A (Tape & Reel).

Lower Data Rate Alternatives: ISL3172EIBZ-T7A and ISL83072EIBZA-T7A operate at 250 kbps, suitable only for applications where the original 20 Mbps data rate is not required. These parts are appropriate for legacy system replacements or low-speed RS422/RS485 networks.

Texas Instruments SN65HVD11 Series: SN65HVD11DR (active status) and SN65HVD11D/SN65HVD11QD (obsolete) operate at 10 Mbps with 35 mV receiver hysteresis. These parts are compatible with the XR3178EID-F pinout and package but provide reduced data rate performance. SN65HVD11DR is the only active TI option in this series and is suitable for applications where 10 Mbps bandwidth is sufficient.

Compliance and Certification: All recommended substitutes meet the ECCN EAR99 and HTSUS 8542.39.0001 classifications. Renesas parts carry ROHS3 compliance and REACH Unaffected status. Texas Instruments parts carry ROHS3 compliance and REACH Unaffected status. MSL ratings vary: MaxLinear and TI parts are MSL 1 (unlimited moisture sensitivity), while Renesas parts are MSL 3 (168 hours).

Frequently Asked Questions (FAQ)

Q: Can ISL3178EIBZ-T7A directly replace XR3178EID-F without circuit modifications? A: Yes. Both parts are half-duplex RS422/RS485 transceivers in 8-SOIC packages with identical supply voltage (3V–3.6V) and operating temperature ranges (-40°C to 85°C). The ISL3178EIBZ-T7A maintains the 20 Mbps data rate and shares the same pinout. The 15 mV receiver hysteresis (versus 25 mV on the original) represents improved input threshold performance and does not require circuit changes.

Q: What is the difference between ISL3178EIBZ, ISL3178EIBZ-T, and ISL3178EIBZ-T7A? A: These three part numbers are electrically identical but differ in packaging format. ISL3178EIBZ is supplied in Tube packaging, ISL3178EIBZ-T in Cut Tape & Digi-Reel format, and ISL3178EIBZ-T7A in Tape & Reel format. Selection depends on your assembly process and procurement volume requirements.

Q: Why does SN65HVD11DR have a lower data rate (10 Mbps) than XR3178EID-F (20 Mbps)? A: The SN65HVD11DR is a different device architecture optimized for lower-speed, higher-noise-immunity applications. While it maintains RS422/RS485 protocol compatibility and the same 8-SOIC package, its 10 Mbps maximum data rate limits it to applications not requiring the full 20 Mbps bandwidth of the original part.

Q: Is MSL rating important when selecting a substitute? A: MSL (Moisture Sensitivity Level) rating affects component handling and storage requirements. XR3178EID-F has MSL 1 (unlimited moisture sensitivity), while Renesas ISL alternatives have MSL 3 (168-hour limit). If your assembly process includes extended storage or high-humidity environments, verify that your manufacturing procedures accommodate the MSL 3 requirement for Renesas parts.

Q: Can I use XR3078XID-F as a drop-in replacement? A: Yes. XR3078XID-F is the direct parametric equivalent with identical electrical specifications and 8-SOIC packaging. It is currently in active production, making it the recommended choice for new designs and immediate procurement needs.

Q: What is the difference between half-duplex and full-duplex transceiver configurations? A: Half-duplex transceivers (like XR3178EID-F) support bidirectional communication but not simultaneously—transmission and reception are time-multiplexed on the same bus. Full-duplex transceivers support simultaneous two-way communication. The XR3178EID-F and all recommended substitutes are half-duplex devices suitable for standard RS422/RS485 bus topologies.

Q: Are there any full-duplex alternatives to XR3178EID-F? A: ISL3171EIBZ-T7A is a full-duplex alternative from Renesas, but it operates at 250 kbps (not 20 Mbps) and has different electrical characteristics. Full-duplex operation requires different circuit topology and is not a direct substitute for half-duplex applications.

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