XR3084XID-F RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The XR3084XID-F is a 1/1 full-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and production continuity. The part operates across a 4.5V to 5.5V supply range with a 1 Mbps data rate and supports full-duplex communication protocols.

Key Parameters

Parameter	XR3084XID-F
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS422, RS485
Duplex Mode	Full
Number of Drivers/Receivers	1/1
Data Rate	1 Mbps
Receiver Hysteresis	25 mV
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the XR3084XID-F is determined by the following critical parameters:

Primary Substitution Criteria:

Protocol support: RS422 and RS485
Duplex mode: Full-duplex operation
Driver/Receiver configuration: 1/1 topology
Package compatibility: 8-SOIC form factor
Mounting type: Surface mount
Moisture sensitivity: MSL 1 (Unlimited)

Secondary Compatibility Factors:

Voltage supply range overlap with 4.5V ~ 5.5V
Operating temperature range that encompasses or exceeds -40°C ~ 85°C
Data rate capability equal to or greater than 1 Mbps

Substitute parts are grouped into two categories based on duplex capability:

Category A - Full-Duplex Substitutes (Direct Functional Equivalents):

HI-4851PSIF (Holt Integrated Circuits Inc.)
MAX13087EASA+ (Analog Devices Inc./Maxim Integrated)

Category B - Half-Duplex Substitutes (Protocol-Compatible Alternatives):

LTC1481CS8#PBF (Analog Devices Inc.)
LTC1481CS8#TRPBF (Analog Devices Inc.)
LTC1485CS8#PBF (Analog Devices Inc.)
LTC1485CS8#TRPBF (Analog Devices Inc.)

Half-duplex parts require circuit redesign considerations but maintain RS422/RS485 protocol compatibility and identical package specifications.

Parameter Comparison

Part Number	Manufacturer	Duplex	Data Rate	Receiver Hysteresis	Voltage Supply	Operating Temp	Package	Product Status	RoHS Status
XR3084XID-F	MaxLinear, Inc.	Full	1 Mbps	25 mV	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Obsolete	—
HI-4851PSIF	Holt Integrated Circuits Inc.	Full	5 Mbps	28 mV	3V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
MAX13087EASA+	Analog Devices Inc./Maxim Integrated	Full	16 Mbps	100 mV	4.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant
LTC1481CS8#PBF	Analog Devices Inc.	Half	2.5 Mbps	45 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
LTC1481CS8#TRPBF	Analog Devices Inc.	Half	2.5 Mbps	45 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
LTC1485CS8#PBF	Analog Devices Inc.	Half	—	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
LTC1485CS8#TRPBF	Analog Devices Inc.	Half	—	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Full-Duplex, No Circuit Redesign):

HI-4851PSIF is the preferred full-duplex substitute. It maintains identical duplex operation, supports the full -40°C to 85°C temperature range, and offers superior data rate performance (5 Mbps vs. 1 Mbps). The part is active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Supply voltage range extends to 3V, providing broader compatibility than the original part.

MAX13087EASA+ is an alternative full-duplex substitute with extended operating temperature range (-40°C to 125°C) and significantly higher data rate capability (16 Mbps). This part is suitable for applications requiring enhanced thermal performance and future bandwidth headroom. ROHS3 compliance and active production status ensure long-term availability.

For Half-Duplex Substitution (Requires Circuit Redesign):

LTC1481CS8#PBF and LTC1481CS8#TRPBF are half-duplex alternatives with 2.5 Mbps data rate capability. These parts require circuit modifications to implement half-duplex communication protocols. Operating temperature range is restricted to 0°C to 70°C, limiting use in extended temperature applications. The #TRPBF variant uses tape and reel packaging; the #PBF variant uses tube packaging.

LTC1485CS8#PBF and LTC1485CS8#TRPBF are half-duplex alternatives with higher receiver hysteresis (60 mV). Data rate is not specified for these parts. Like the LTC1481 series, these require circuit redesign and operate within 0°C to 70°C temperature range. Packaging options include tube (#PBF) and tape and reel (#TRPBF).

All substitute parts maintain 8-SOIC package compatibility, surface mount mounting type, and MSL 1 moisture sensitivity rating. All active substitutes carry ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can HI-4851PSIF be used as a direct drop-in replacement for XR3084XID-F?

A: Yes, HI-4851PSIF is a direct functional equivalent. Both are full-duplex 1/1 RS422/RS485 transceivers in 8-SOIC packages with identical pinout compatibility. No circuit redesign is required. The HI-4851PSIF operates across -40°C to 85°C, matching the original part's temperature range, and supports supply voltages from 3V to 5.5V, which encompasses the XR3084XID-F range of 4.5V to 5.5V.

Q: What is the difference between full-duplex and half-duplex substitutes?

A: Full-duplex transceivers (HI-4851PSIF, MAX13087EASA+) enable simultaneous bidirectional communication on separate transmit and receive lines. Half-duplex transceivers (LTC1481, LTC1485 series) require time-division multiplexing on a single line pair, necessitating circuit modifications and protocol changes. Full-duplex substitutes require no redesign; half-duplex substitutes require significant circuit and firmware changes.

Q: Are the LTC1481 and LTC1485 series suitable for low-temperature applications?

A: No. The LTC1481 and LTC1485 series operate within 0°C to 70°C, which does not cover the XR3084XID-F operating range of -40°C to 85°C. These parts are unsuitable for applications requiring extended low-temperature operation below 0°C or high-temperature operation above 70°C.

Q: What is the difference between #PBF and #TRPBF packaging variants?

A: #PBF indicates tube packaging, suitable for manual assembly and lower-volume production. #TRPBF indicates tape and reel packaging, optimized for automated pick-and-place assembly and higher-volume manufacturing. Both variants contain identical die and electrical specifications; packaging choice depends on assembly process requirements.

Q: Does MAX13087EASA+ require any circuit modifications compared to XR3084XID-F?

A: No circuit modifications are required. MAX13087EASA+ is a full-duplex 1/1 RS422/RS485 transceiver with identical functional topology. The higher receiver hysteresis (100 mV vs. 25 mV) and increased data rate capability (16 Mbps vs. 1 Mbps) are backward-compatible enhancements. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin without requiring design changes.

Q: What is receiver hysteresis and why does it vary among substitutes?

A: Receiver hysteresis is the voltage difference between the rising and falling threshold levels of the input comparator. Higher hysteresis values (100 mV for MAX13087EASA+) provide greater noise immunity but may reduce sensitivity to small signal transitions. Lower hysteresis values (25 mV for XR3084XID-F) enable detection of smaller signals but offer less noise margin. All listed substitutes maintain RS422/RS485 protocol compliance across their specified hysteresis ranges.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed (HI-4851PSIF, MAX13087EASA+, LTC1481 series, LTC1485 series) carry ROHS3 compliance certification. The original XR3084XID-F does not specify RoHS status due to its obsolete classification. RoHS3 compliance ensures lead-free construction and compliance with EU Directive 2011/65/EU.

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