RN732ATTD40R2C40 Equivalent & Substitute Parts

Part Overview

The RN732ATTD40R2C50 is a 40.2 Ohm thin film chip resistor manufactured by KOA Speer Electronics, Inc., specified for 0.1W (1/10W) power dissipation in a 0805 (2012 Metric) surface mount package. This component features ±0.25% tolerance, moisture resistance, and operates across -55°C to 155°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

RN732ATTD40R2C50

KOA Speer Electronics, Inc.In Stock: 1105RN732ATTD40R2C50 Datasheet

Current PartRFQ

RN73R2ATTD40R2C50

KOA Speer Electronics, Inc.In Stock: 818RN73R2ATTD40R2C50 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN732ATTD40R2C50 is based on the following criteria:

Mandatory Matching Parameters:

• Resistance value: 40.2 Ohms (exact match required)
• Tolerance: ±0.25% (substitute must maintain this specification)
• Package: 0805 (2012 Metric) (physical and electrical compatibility)
• Composition: Thin Film (ensures temperature coefficient and stability characteristics)
• Temperature Coefficient: ±50ppm/°C (frequency response and drift performance)
• Operating Temperature Range: -55°C ~ 155°C (environmental suitability)
• Moisture Resistance: Required (environmental protection)

Allowable Variation:

• Power Rating: Substitute may exceed 0.1W (higher power rating is acceptable and provides additional thermal margin)
• Product Status: Active status preferred for long-term availability
• Certifications: Additional certifications (such as AEC-Q200) are acceptable enhancements

Parameter Comparison

Engineering Selection Recommendations

RN73R2ATTD40R2C50 as Primary Substitute:

The RN73R2ATTD40R2C50 is a direct functional equivalent to the obsolete RN732ATTD40R2C50. Both components share identical electrical specifications: 40.2 Ohm resistance, ±0.25% tolerance, thin film composition, ±50ppm/°C temperature coefficient, and -55°C to 155°C operating range. The substitute maintains the same 0805 package footprint and moisture resistance characteristics.

The RN73R2ATTD40R2C50 provides the following advantages:

• Active Product Status: Ensures long-term availability and supply chain continuity
• Enhanced Power Rating: 0.125W (1/8W) rating exceeds the original 0.1W specification, providing additional thermal margin without affecting circuit performance
• Automotive Qualification: AEC-Q200 certification indicates enhanced reliability testing and suitability for demanding applications
• Compliance: ROHS3 compliant and REACH unaffected, matching the original part's regulatory status

Packaging Consideration:

The substitute is supplied in Tape & Reel (TR) packaging, which is standard for automated assembly processes. This packaging format is compatible with standard pick-and-place equipment used in manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can the RN73R2ATTD40R2C50 be used as a direct replacement for the RN732ATTD40R2C50?

A: Yes. Both components have identical resistance (40.2 Ohms), tolerance (±0.25%), package (0805), composition (thin film), temperature coefficient (±50ppm/°C), and operating temperature range (-55°C to 155°C). The substitute's higher power rating (0.125W vs. 0.1W) is acceptable and provides additional thermal capability.

Q: What is the significance of the higher power rating in the substitute part?

A: The RN73R2ATTD40R2C50 is rated for 0.125W compared to the original 0.1W. A higher power rating indicates greater thermal dissipation capability. In circuit applications, this provides additional safety margin and does not negatively affect performance when the actual power dissipation remains within the original specification.

Q: Does the AEC-Q200 certification on the substitute part affect compatibility?

A: No. AEC-Q200 is an automotive qualification standard that indicates enhanced reliability testing. This certification is an additional benefit and does not create incompatibility with the original design. The part remains suitable for all applications where the original was specified.

Q: Are the physical dimensions identical between the main part and substitute?

A: Yes. Both components are 0805 (2012 Metric) package with identical dimensions: 0.079" L x 0.049" W (2.00mm x 1.25mm) and maximum seated height of 0.024" (0.60mm). PCB footprints and assembly processes are identical.

Q: What is the difference between the RN732 and RN73R2 series designations?

A: The RN73R2 series represents an updated product line from KOA Speer Electronics with active production status and enhanced specifications (higher power rating and automotive qualification). The RN732 series is obsolete. Both series share identical core electrical parameters for the 40.2 Ohm specification.

Q: Is the Tape & Reel packaging compatible with standard assembly equipment?

A: Yes. Tape & Reel (TR) packaging is the standard format for automated surface mount assembly. It is compatible with all conventional pick-and-place equipment and reflow soldering processes.

Q: Are there any compliance or regulatory differences between the parts?

A: No. Both components are ROHS3 compliant, REACH unaffected, and carry identical MSL (Moisture Sensitivity Level) ratings of 1 (Unlimited). Regulatory and environmental compliance is equivalent.