RN732BTTD3440C50 Equivalent & Substitute Parts

Part Overview

The RN732BTTD3440C50 is a 344 Ohm thin film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.125W (1/8W) with ±0.25% tolerance in a 1206 (3216 Metric) surface mount package. This component is classified as obsolete product status. Locating equivalent or substitute parts becomes necessary due to discontinued availability, supply chain constraints, or design requirements for active product lines. The substitute part identified maintains the same resistance value, tolerance, and package footprint while offering enhanced power rating and automotive qualification.

Substiute Parts

RN732BTTD3440C50

KOA Speer Electronics, Inc.In Stock: 935RN732BTTD3440C50 Datasheet

Current PartRFQ

RN73R2BTTD3440C50

KOA Speer Electronics, Inc.In Stock: 867RN73R2BTTD3440C50 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN732BTTD3440C50 with the RN73R2BTTD3440C50 is permissible based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Resistance value: 344 Ohms (identical)
• Tolerance: ±0.25% (identical)
• Package footprint: 1206 (3216 Metric) (identical)
• Temperature coefficient: ±50ppm/°C (identical)
• Operating temperature range: -55°C ~ 155°C (identical)
• Composition: Thin Film (identical)
• Moisture resistance: Present in both (identical)
• RoHS3 compliance: Both compliant (identical)
• Moisture Sensitivity Level: 1 (Unlimited) (identical)

Differing Parameter:

• Power rating: RN732BTTD3440C50 rated at 0.125W; RN73R2BTTD3440C50 rated at 0.25W (higher rating in substitute)

The substitute part RN73R2BTTD3440C50 provides a higher power dissipation capability (0.25W versus 0.125W) within the same physical package envelope, making it suitable for applications requiring equal or greater thermal headroom. The identical footprint ensures direct PCB compatibility without layout modifications.

Parameter Comparison

Engineering Selection Recommendations

The RN73R2BTTD3440C50 serves as a direct functional substitute for the obsolete RN732BTTD3440C50 in applications where the original part is no longer available. Selection of the substitute part is supported by the following factors:

Product Status: The substitute part maintains active product status with KOA Speer Electronics, Inc., ensuring continued availability and supply chain reliability compared to the obsolete main part.

Compliance & Certifications: Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings (MSL 1). The substitute part carries additional AEC-Q200 automotive qualification, which does not restrict its use in non-automotive applications and provides enhanced reliability documentation.

Electrical Equivalence: Identical resistance, tolerance, temperature coefficient, and operating temperature range ensure electrical performance parity in circuit applications.

Mechanical Compatibility: Identical 1206 package footprint and physical dimensions permit direct PCB substitution without layout redesign.

Power Margin: The substitute part's doubled power rating (0.25W versus 0.125W) provides additional thermal margin in the same package, reducing thermal stress during operation.

Frequently Asked Questions (FAQ)

Q: Can the RN73R2BTTD3440C50 be used as a direct replacement for the RN732BTTD3440C50 on existing PCBs?

A: Yes. Both parts share identical 1206 (3216 Metric) package footprints and physical dimensions (0.126" L x 0.063" W, 3.20mm x 1.60mm). No PCB layout modifications are required for substitution.

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

A: No electrical performance differences exist in circuit operation. Both parts provide 344 Ohms ±0.25% resistance with ±50ppm/°C temperature coefficient across the -55°C ~ 155°C operating range. The substitute part's higher power rating (0.25W versus 0.125W) does not alter electrical characteristics; it only increases thermal dissipation capability.

Q: Why does the substitute part have a higher power rating?

A: The RN73R2BTTD3440C50 is rated for 0.25W (1/4W) compared to the 0.125W (1/8W) rating of the main part. This higher rating accommodates greater power dissipation within the same physical package, providing thermal design margin for applications with higher current or voltage stress.

Q: What is the significance of the AEC-Q200 qualification on the substitute part?

A: AEC-Q200 is an automotive industry qualification standard. The substitute part's AEC-Q200 rating indicates compliance with automotive reliability and quality requirements. This certification does not restrict use in non-automotive applications and reflects enhanced quality assurance documentation.

Q: Are both parts RoHS compliant?

A: Yes. Both the RN732BTTD3440C50 and RN73R2BTTD3440C50 are ROHS3 compliant, meeting restrictions on hazardous substances in electrical and electronic equipment.

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

A: Both parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. These components do not require special moisture control during storage, handling, or assembly.

Q: Why is the main part listed as obsolete?

A: Product obsolescence indicates that the RN732BTTD3440C50 has been discontinued by the manufacturer and is no longer in active production. The substitute part RN73R2BTTD3440C50 remains in active production status, ensuring long-term availability.