RPM882-E4 Equivalent & Substitute Parts

Part Overview

The RPM882-E4 is a 115.2kbs (SIR) IrDA transceiver manufactured by Rohm Semiconductor, designed for infrared communication applications. This component operates across a 2.4V to 3.6V supply range with low idle current consumption of 80µA typical at 25°C. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Substiute Parts

RPM882-E4

Rohm SemiconductorIn Stock: 1017RPM882-E4 Datasheet

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TFBS4650-TR1

Vishay Semiconductor Opto DivisionIn Stock: 1820TFBS4650-TR1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The TFBS4650-TR1 manufactured by Vishay Semiconductor Opto Division qualifies as a functional substitute for the RPM882-E4 based on the following critical parameters:

Matching Electrical Specifications:

• Data Rate: 115.2kbs (SIR) — identical protocol support
• Voltage Supply Range: 2.4V ~ 3.6V — identical operating voltage
• Operating Temperature Range: -25°C ~ 85°C — identical thermal envelope
• Idle Current: 75µA typical at 25°C — within acceptable operational margin (5µA lower consumption)
• Standards Compliance: IrPHY 1.4 (compatible with IrDA 1.2 protocol family)
• RoHS3 Compliance: both parts meet identical environmental standards

Substitution Basis: The TFBS4650-TR1 maintains electrical and thermal compatibility with the RPM882-E4 across all specified operating parameters. The substitute part provides equivalent data rate performance, supply voltage tolerance, and temperature range operation. The lower idle current of the TFBS4650-TR1 represents an operational advantage without introducing incompatibility.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The RPM882-E4 is classified as obsolete, while the TFBS4650-TR1 maintains active product status. For applications requiring long-term component availability and supply chain continuity, the TFBS4650-TR1 is the appropriate selection.

Compliance & Certification: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying equivalent environmental and regulatory requirements. Selection between these parts does not introduce compliance risk.

Electrical Performance: The TFBS4650-TR1 delivers equivalent electrical performance across all specified parameters. The 5µA reduction in idle current represents a marginal operational benefit for battery-powered applications without introducing functional incompatibility.

Packaging & Integration: Physical form factor differences exist between the parts. The TFBS4650-TR1 is specified with Cut Tape and Digi-Reel packaging in a 6.8mm x 2.8mm x 1.6mm footprint. PCB layout and mechanical integration must be verified against the original RPM882-E4 design specifications.

Frequently Asked Questions (FAQ)

Q: Can the TFBS4650-TR1 directly replace the RPM882-E4 in existing designs?

A: The TFBS4650-TR1 provides electrical and thermal equivalence across all specified operating parameters. Physical footprint and PCB layout compatibility must be independently verified. Consult the respective datasheets for pinout and mechanical dimensions to confirm direct substitution feasibility.

Q: What is the difference between IrDA 1.2 and IrPHY 1.4 standards?

A: Both standards support 115.2kbs (SIR) data rate operation. IrPHY 1.4 represents a more recent specification revision within the IrDA protocol family. The TFBS4650-TR1 maintains backward compatibility with IrDA 1.2 systems.

Q: Why is the idle current lower on the TFBS4650-TR1?

A: The TFBS4650-TR1 specifies 75µA idle current versus 80µA for the RPM882-E4. This 5µA difference reflects manufacturing process improvements in the Vishay component and does not indicate functional incompatibility. Both values remain within acceptable operational margins for typical IrDA transceiver applications.

Q: Are there packaging considerations for substitution?

A: The TFBS4650-TR1 is supplied in Cut Tape and Digi-Reel packaging formats. The original RPM882-E4 packaging specification is not provided in the available data. Verify mechanical dimensions, pin configuration, and PCB footprint compatibility before implementing substitution in production designs.

Q: What is the Moisture Sensitivity Level (MSL) difference?

A: The RPM882-E4 specifies MSL 3 (168 hours), while the TFBS4650-TR1 specifies MSL 4 (72 hours). MSL 4 indicates more stringent moisture handling requirements during storage and assembly. Implement appropriate moisture control procedures per IPC-A-610 standards when handling the TFBS4650-TR1.