RN732ATTD2802F50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD2802F50 is a 28 kOhms ±1% thin film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.1W (1/10W) in 0805 (2012 Metric) package format. This component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts from active manufacturers are necessary to ensure design continuity and procurement availability for new production runs and ongoing system support.

Key Parameters

Parameter	Value
Resistance	28 kOhms
Tolerance	±1%
Power Rating	0.1W (1/10W)
Package / Case	0805 (2012 Metric)
Composition	Thin Film
Temperature Coefficient	±50ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the RN732ATTD2802F50 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Resistance value: 28 kOhms (exact match required)
Tolerance: ±1% minimum (equal or tighter tolerance acceptable)
Package: 0805 (2012 Metric) form factor (exact match required)
Composition: Thin Film (exact match required)
Temperature Coefficient: ±50ppm/°C or better
Operating Temperature Range: -55°C ~ 155°C minimum coverage
Moisture Sensitivity Level: 1 (Unlimited) or equivalent
RoHS Compliance: ROHS3 Compliant

Power Rating Consideration: The original part is rated at 0.1W (1/10W). Substitute parts with equal or higher power ratings (0.125W/1/8W, 0.25W/1/4W, 0.63W/5/8W) are electrically compatible and mechanically interchangeable within the 0805 package envelope, as higher power ratings do not degrade performance in lower-power applications.

Substitutes are grouped into two categories:

Direct Equivalents: Parts meeting all primary criteria with identical or equivalent power ratings (0.1W–0.125W range).

Upgraded Alternatives: Parts exceeding specifications in tolerance (±0.5%, ±0.1%), power rating, or feature set (automotive AEC-Q200, anti-sulfur, current sense, flame proof) while maintaining full backward compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Package	Features	Product Status	RoHS
RN732ATTD2802F50	KOA Speer Electronics	28k	±1%	0.1	±50	-55 ~ 155	0805	Moisture Resistant	Obsolete	ROHS3
RN73R2ATTD2802F50	KOA Speer Electronics	28k	±1%	0.125	±50	-55 ~ 155	0805	Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
RT0805FRE0728KL	YAGEO	28k	±1%	0.125	±50	-55 ~ 155	0805	—	Active	ROHS3
AT0805DRE0728KL	YAGEO	28k	±0.5%	0.125	±50	-55 ~ 155	0805	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
CRT0805-FY-2802ELF	Bourns Inc.	28k	±1%	0.125	±25	-55 ~ 155	0805	Current Sense	Active	ROHS3
MCU08050C2802DP500	Vishay Beyschlag/Draloric/BC Components	28k	±0.5%	0.125	±50	-55 ~ 155	0805	Anti-Sulfur	Active	ROHS3
MCU08050C2802FP500	Vishay Beyschlag/Draloric/BC Components	28k	±1%	0.125	±50	-55 ~ 155	0805	Anti-Sulfur	Active	ROHS3
PHP00805H2802BBT1	Vishay Dale Thin Film	28k	±0.1%	0.63	±50	-55 ~ 155	0805	Flame Proof, Moisture Resistant, Safety	Active	Non-compliant
PHP00805H2802BST1	Vishay Dale Thin Film	28k	±0.1%	0.63	±50	-55 ~ 155	0805	Flame Proof, Moisture Resistant, Safety	Active	ROHS3
RNCF0805BTC28K0	Stackpole Electronics Inc	28k	±0.1%	0.25	±50	-55 ~ 155	0805	Automotive AEC-Q200	Active	ROHS3
RNCF0805DTC28K0	Stackpole Electronics Inc	28k	±0.5%	0.25	±50	-55 ~ 155	0805	Automotive AEC-Q200	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Minimum Specification Match):

Select RN73R2ATTD2802F50 (KOA Speer Electronics) or RT0805FRE0728KL (YAGEO) for applications requiring direct functional equivalence. Both parts maintain ±1% tolerance, 28 kOhms resistance, 0805 package, and -55°C ~ 155°C operating range. RN73R2ATTD2802F50 carries automotive AEC-Q200 qualification; RT0805FRE0728KL offers broader market availability. Both are active products with ROHS3 compliance.

For Improved Tolerance Requirements:

Select AT0805DRE0728KL (YAGEO), MCU08050C2802DP500 (Vishay), RNCF0805BTC28K0 (Stackpole), or RNCF0805DTC28K0 (Stackpole) when ±0.5% or ±0.1% tolerance is specified. These parts provide tighter tolerance control while maintaining identical resistance, package, and temperature range. AT0805DRE0728KL and RNCF series include automotive AEC-Q200 certification.

For Enhanced Reliability in Harsh Environments:

Select PHP00805H2802BST1 (Vishay Dale Thin Film) for applications requiring flame proof, moisture resistant, and safety-rated construction. This part offers ±0.1% tolerance and 0.63W power rating with ROHS3 compliance. PHP00805H2802BBT1 is functionally identical but carries RoHS non-compliant status.

For Current Sensing Applications:

Select CRT0805-FY-2802ELF (Bourns Inc.) when current sense functionality is required. This part maintains ±1% tolerance and 0805 package with ±25ppm/°C temperature coefficient (superior to standard ±50ppm/°C).

For Automotive Applications:

Select RN73R2ATTD2802F50, AT0805DRE0728KL, RNCF0805BTC28K0, or RNCF0805DTC28K0 for designs requiring AEC-Q200 automotive qualification. All four parts meet this standard.

All recommended substitutes are active products with ROHS3 compliance (except PHP00805H2802BBT1), ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q1: Can I use a substitute part with higher power rating than the original RN732ATTD2802F50?

A: Yes. The RN732ATTD2802F50 is rated at 0.1W (1/10W). Substitute parts with 0.125W (1/8W), 0.25W (1/4W), or 0.63W (5/8W) ratings are mechanically and electrically compatible within the 0805 package. Higher power ratings do not degrade performance in applications designed for lower power dissipation. Physical dimensions remain within 0805 specification envelope.

Q2: What is the difference between ±1%, ±0.5%, and ±0.1% tolerance specifications?

A: Tolerance defines the maximum deviation from the nominal 28 kOhm resistance value. ±1% allows deviation up to ±280 Ohms; ±0.5% limits deviation to ±140 Ohms; ±0.1% restricts deviation to ±28 Ohms. Applications requiring precise resistance values (analog circuits, precision instrumentation) benefit from tighter tolerance. Standard digital applications typically accept ±1% tolerance.

Q3: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes are ROHS3 compliant except PHP00805H2802BBT1, which carries RoHS non-compliant status. For applications requiring regulatory compliance with ROHS3 standards, avoid PHP00805H2802BBT1 and select from the remaining alternatives.

Q4: What does AEC-Q200 automotive qualification mean?

A: AEC-Q200 is an automotive industry standard qualification for passive components. Parts meeting this standard have undergone rigorous testing for reliability, temperature cycling, moisture resistance, and long-term stability under automotive operating conditions. Select AEC-Q200 qualified parts (RN73R2ATTD2802F50, AT0805DRE0728KL, RNCF0805BTC28K0, RNCF0805DTC28K0) for automotive applications.

Q5: Can I substitute the RN732ATTD2802F50 with a part having different temperature coefficient?

A: The original part specifies ±50ppm/°C temperature coefficient. Most substitutes maintain this specification. CRT0805-FY-2802ELF offers ±25ppm/°C (superior stability). Substitution with tighter temperature coefficient is acceptable and improves performance. Substitution with looser coefficient is not recommended for precision applications.

Q6: What is the significance of "Moisture Resistant" and "Anti-Sulfur" features?

A: Moisture Resistant construction protects against humidity ingress and corrosion in high-humidity environments. Anti-Sulfur treatment prevents sulfur-induced corrosion from atmospheric pollutants, extending component lifespan in industrial and automotive applications. These features are optional enhancements; standard parts without these designations are suitable for controlled indoor environments.

Q7: Is the 0805 package dimension identical across all substitute parts?

A: Yes. All substitute parts use 0805 (2012 Metric) package with standardized dimensions: 0.079" L × 0.049" W (2.00mm × 1.25mm). Height varies slightly (0.022" to 0.033" seated maximum) depending on construction, but all parts fit standard 0805 PCB footprints without modification.

Q8: Why is the original RN732ATTD2802F50 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. KOA Speer Electronics has transitioned to the RN73R series (represented by RN73R2ATTD2802F50), which offers enhanced features including automotive AEC-Q200 qualification. Substitute parts from active manufacturers (YAGEO, Bourns, Vishay, Stackpole) provide equivalent or superior performance with guaranteed long-term availability.

Q9: Which substitute offers the best overall value for general-purpose applications?

A: RT0805FRE0728KL (YAGEO) provides optimal value for general-purpose applications. It maintains ±1% tolerance, 28 kOhms resistance, 0805 package, and full -55°C ~ 155°C operating range with ROHS3 compliance and active product status. YAGEO's broad market distribution ensures consistent availability and competitive pricing.

Q10: Can I mix different substitute part manufacturers in the same design?

A: Yes. All substitute parts meet identical electrical specifications (28 kOhms ±1%, 0805 package, -55°C ~ 155°C operating range, ROHS3 compliance). Mixing manufacturers is acceptable for production flexibility and supply chain resilience. Ensure all selected parts meet your application's tolerance, power rating, and feature requirements.

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