RP2012T-4R7-F Equivalent & Substitute Parts

Part Overview

The RP2012T-4R7-F is a 4.7 Ohm ±1% metal film chip resistor rated at 0.333W (1/3W) in 0805 (2012 Metric) surface mount package. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute parts must maintain electrical and mechanical compatibility while meeting the same functional requirements.

Substiute Parts

RP2012T-4R7-F

SusumuIn Stock: 768RP2012T-4R7-F Datasheet

Current PartRFQ

RL1220S-4R7-F

SusumuIn Stock: 44188RL1220S-4R7-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RP2012T-4R7-F is based on the following critical parameters that must remain constant:

• Resistance Value: 4.7 Ohms (exact match required)
• Tolerance: ±1% (equivalent or tighter tolerance acceptable)
• Power Rating: 0.333W minimum (equal or higher acceptable)
• Package / Case: 0805 (2012 Metric) (exact match required for PCB compatibility)
• Operating Temperature Range: -55°C ~ 125°C minimum (equal or wider range acceptable)
• RoHS Compliance: ROHS3 Compliant (required for regulatory compliance)
• Moisture Sensitivity Level: 1 (Unlimited) (equal or lower MSL acceptable)

The RL1220S-4R7-F qualifies as a direct substitute based on these parameters. While the composition differs (thin film versus metal film) and the temperature coefficient is improved, the electrical performance and mechanical compatibility remain equivalent for standard circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The RL1220S-4R7-F is a direct substitute for the RP2012T-4R7-F based on electrical and mechanical equivalence. Selection criteria are as follows:

Primary Recommendation: RL1220S-4R7-F

• Maintains identical resistance, tolerance, power rating, and package specifications
• Meets all RoHS3 and REACH compliance requirements
• Active product status ensures ongoing availability and supply chain continuity
• Improved temperature coefficient (200ppm/°C versus 350ppm/°C) provides enhanced stability
• Thin film composition offers superior frequency response characteristics for current sensing applications
• Identical physical dimensions and termination count ensure direct PCB compatibility without layout modifications

Compliance Status: Both parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for commercial and industrial applications.

Frequently Asked Questions (FAQ)

Q: Can the RL1220S-4R7-F be used as a direct replacement for the RP2012T-4R7-F without PCB modifications?

A: Yes. Both parts share identical package specifications (0805 / 2012 Metric), physical dimensions (0.079" L x 0.049" W), and termination count (2). No PCB layout changes are required.

Q: What is the difference between metal film and thin film composition?

A: Metal film resistors (RP2012T) use a metal alloy film deposited on a ceramic substrate. Thin film resistors (RL1220S) use a thin film deposition process. For this 4.7 Ohm application, both compositions meet the specified tolerance (±1%) and power rating (0.333W). The thin film variant offers a lower temperature coefficient (200ppm/°C versus 350ppm/°C), resulting in improved stability across the operating temperature range.

Q: Are there any electrical performance differences between these parts?

A: Both parts meet the specified electrical requirements: 4.7 Ohms ±1% resistance, 0.333W power rating, and -55°C ~ 125°C operating temperature range. The RL1220S-4R7-F features a lower temperature coefficient, which may provide improved performance in temperature-sensitive applications.

Q: Why is the RP2012T-4R7-F marked as obsolete?

A: The RP2012T-4R7-F is classified as obsolete by the manufacturer. The RL1220S-4R7-F is the active equivalent part and is recommended for new designs and ongoing production.

Q: Are both parts RoHS compliant?

A: Yes. Both the RP2012T-4R7-F and RL1220S-4R7-F are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for commercial, industrial, and consumer applications.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply.

Q: Can the RL1220S-4R7-F be used in high-frequency applications?

A: The RL1220S-4R7-F is designated as a current sense thin film resistor. Thin film construction provides superior frequency response characteristics compared to metal film variants, making it suitable for high-frequency and precision measurement applications.