RPM871-E4A IrDA Transceiver Module - Equivalent & Substitute Parts

Part Overview

The RPM871-E4A is a 115.2 kbps (SIR) IrDA transceiver module manufactured by Rohm Semiconductor. This component operates at supply voltages between 2.6 V and 3.6 V with typical idle current consumption of 73 µA and supports a low-power link range of 20 cm to 60 cm. The module complies with IrDA 1.2 standards and is housed in an 8-pin SMD package measuring 7.60 mm × 2.72 mm × 2.00 mm.

The RPM871-E4A is classified as obsolete. Locating equivalent or substitute components is necessary for new designs, production continuity, or system upgrades where this part is no longer readily available through standard distribution channels.

Substiute Parts

RPM871-E4A

Rohm SemiconductorIn Stock: 2829RPM871-E4A Datasheet

Current PartRFQ

TFDU4301-TT1

Vishay Semiconductor Opto DivisionIn Stock: 15963TFDU4301-TT1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RPM871-E4A is determined by the following critical parameters:

• Data Rate Compatibility: The substitute must support 115.2 kbps (SIR) IrDA operation
• Supply Voltage Range: The substitute must operate within or encompass the 2.6 V to 3.6 V supply range
• Package Type: The substitute must be compatible with 8-pin SMD mounting
• Standards Compliance: The substitute must comply with IrDA or IrPHY standards
• Environmental Specifications: Operating temperature range and RoHS compliance must be suitable for the application

The TFDU4301-TT1 meets these substitution criteria through equivalent data rate support, overlapping supply voltage range, compatible SMD packaging, and equivalent environmental compliance.

Parameter Comparison

Engineering Selection Recommendations

The TFDU4301-TT1 is suitable as a substitute for the RPM871-E4A based on the following factors:

• Product Status: The TFDU4301-TT1 is classified as Active, ensuring ongoing availability and support, whereas the RPM871-E4A is Obsolete
• Compliance: Both components are ROHS3 Compliant and REACH Unaffected, meeting equivalent regulatory requirements
• Functional Compatibility: Both components operate at 115.2 kbps (SIR) data rate and support IrDA-based standards (IrDA 1.2 vs. IrPHY 1.0)
• Supply Voltage: The TFDU4301-TT1 supply range (2.4 V ~ 5.5 V) encompasses the RPM871-E4A range (2.6 V ~ 3.6 V), providing broader operational flexibility
• Operating Temperature: The TFDU4301-TT1 extends the lower temperature limit to -30°C, offering improved performance in cold environments

Design considerations include slightly higher idle current consumption (100 µA vs. 73 µA) and extended link range capability (70 cm vs. 60 cm maximum) in the substitute component.

Frequently Asked Questions (FAQ)

Q: Can the TFDU4301-TT1 directly replace the RPM871-E4A in existing designs?

A: The TFDU4301-TT1 is functionally compatible for 115.2 kbps IrDA transceiver applications. Both components use 8-pin SMD packaging and operate at the same data rate. However, physical package dimensions differ (TFDU4301-TT1 specifies 2.5 mm size vs. RPM871-E4A at 7.60 mm × 2.72 mm × 2.00 mm), requiring PCB layout verification before implementation.

Q: What are the key differences in electrical performance?

A: The TFDU4301-TT1 has higher idle current consumption (100 µA vs. 73 µA) and an extended supply voltage range (2.4 V ~ 5.5 V vs. 2.6 V ~ 3.6 V). The substitute offers improved low-power link range (70 cm vs. 60 cm) and broader operating temperature coverage (-30°C ~ 85°C vs. -20°C ~ 85°C).

Q: Are there compliance or certification concerns with substitution?

A: Both components are ROHS3 Compliant and REACH Unaffected. The RPM871-E4A complies with IrDA 1.2 standards, while the TFDU4301-TT1 complies with IrPHY 1.0 standards. Both standards support 115.2 kbps SIR operation, ensuring protocol compatibility.

Q: What packaging formats are available for the TFDU4301-TT1?

A: The TFDU4301-TT1 is available in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for both prototype and production volume requirements.

Q: How does the extended supply voltage range of the TFDU4301-TT1 affect circuit design?

A: The broader supply range (2.4 V ~ 5.5 V) of the TFDU4301-TT1 allows operation in systems with varying power supply specifications. Designs originally constrained to 2.6 V ~ 3.6 V can now operate down to 2.4 V and up to 5.5 V, provided other circuit components support these voltage levels.