RPM871-E2 Equivalent & Substitute Parts

Part Overview

The RPM871-E2 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 at 25°C. The module is housed in an 8-pin surface-mount package with dimensions of 7.60mm x 2.72mm x 2.00mm and complies with IrDA 1.2 standards.

The RPM871-E2 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this transceiver function is required.

Key Parameters

Parameter	RPM871-E2 Specification
Data Rate	115.2 kbps (SIR)
Voltage - Supply	2.6 V ~ 3.6 V
Idle Current, Typ @ 25°C	73 µA
Operating Temperature Range	-20°C ~ 85°C
Package Type	8SMD
Standards Compliance	IrDA 1.2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RPM871-E2 is determined by the following critical parameters:

Data Rate Compatibility: The substitute must support 115.2 kbps (SIR) IrDA transmission
Supply Voltage Range: The substitute must operate within or encompass the 2.6 V ~ 3.6 V range
Package Configuration: The substitute must be compatible with 8-pin surface-mount assembly
Standards Compliance: The substitute must meet IrDA or IrPHY standards for infrared communication
Environmental Ratings: Operating temperature and moisture sensitivity must be suitable for the application environment
Regulatory Compliance: RoHS3 compliance is required for current manufacturing standards

The TFDU4301-TT1 from Vishay Semiconductor Opto Division meets these substitution criteria through equivalent data rate support, overlapping voltage specifications, compatible surface-mount packaging, and matching regulatory compliance.

Parameter Comparison

Parameter	RPM871-E2 (Rohm)	TFDU4301-TT1 (Vishay)	Compatibility Notes
Data Rate	115.2 kbps (SIR)	115.2 kbps (SIR)	Equivalent
Voltage - Supply	2.6 V ~ 3.6 V	2.4 V ~ 5.5 V	Vishay range encompasses Rohm specification
Idle Current, Typ @ 25°C	73 µA	100 µA	Vishay higher by 27 µA; acceptable for most applications
Operating Temperature Range	-20°C ~ 85°C	-30°C ~ 85°C	Vishay provides extended low-temperature range
Package Type	8SMD	8SMD	Equivalent
Standards Compliance	IrDA 1.2	IrPHY 1.0	Both support infrared communication standards
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	4 (72 Hours)	Rohm has superior moisture tolerance; Vishay requires controlled storage
Shutdown Feature	Not specified	Yes	Vishay includes power management capability

Engineering Selection Recommendations

The TFDU4301-TT1 is an active product with current manufacturing support, whereas the RPM871-E2 is obsolete. Both components are ROHS3 compliant and meet infrared communication standards.

Selection between these parts should be based on:

Supply Voltage Requirements: If the application operates strictly within 2.6 V ~ 3.6 V, both parts are suitable. If higher supply voltages (up to 5.5 V) are present in the system, the TFDU4301-TT1 provides additional margin.
Power Budget Constraints: The RPM871-E2 has lower idle current (73 µA vs. 100 µA). For battery-powered applications with strict power budgets, verify that the additional 27 µA consumption is acceptable.
Storage and Handling: The RPM871-E2 (MSL 1) has unlimited shelf life under standard conditions. The TFDU4301-TT1 (MSL 4) requires controlled storage at ≤40°C and ≤90% relative humidity for 72 hours after opening.
Temperature Range: The TFDU4301-TT1 extends the lower operating limit to -30°C, providing additional environmental coverage if required.
Availability: The TFDU4301-TT1 is in active production with higher inventory levels, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can the TFDU4301-TT1 directly replace the RPM871-E2 in existing designs?

A: Yes, for applications operating within the 2.6 V ~ 3.6 V supply range. Both components support 115.2 kbps IrDA communication, use identical 8-pin surface-mount packaging, and meet current RoHS3 compliance requirements. Verify that the 27 µA increase in idle current and MSL 4 moisture sensitivity do not conflict with your application requirements.

Q: What is the difference between IrDA 1.2 and IrPHY 1.0 standards?

A: Both standards define infrared communication protocols. IrDA 1.2 is the specification for the RPM871-E2, while IrPHY 1.0 is the specification for the TFDU4301-TT1. Both support 115.2 kbps (SIR) data rates and are compatible for this application.

Q: Does the TFDU4301-TT1 shutdown feature provide any advantage?

A: The shutdown feature on the TFDU4301-TT1 allows the transceiver to enter a low-power state when not in use. This can reduce overall system power consumption in applications with intermittent IrDA communication. The RPM871-E2 does not specify a shutdown capability.

Q: What are the storage requirements for the TFDU4301-TT1?

A: The TFDU4301-TT1 has Moisture Sensitivity Level 4, requiring storage at temperatures ≤40°C and relative humidity ≤90% for a maximum of 72 hours after the package is opened. After this period, the component must be baked at 125°C for 24 hours before use. The RPM871-E2 (MSL 1) has no such restrictions.

Q: Are there any PCB layout considerations when switching from RPM871-E2 to TFDU4301-TT1?

A: Both components use 8-pin surface-mount packages. Verify pinout compatibility with your PCB design. Consult the respective datasheets for pin assignments and signal routing requirements to ensure proper circuit operation.

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