RN732ATTD2493D100 Equivalent & Substitute Parts

Part Overview

The RN732ATTD2493D100 is a 249 kOhms ±0.5% thin film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.1W (1/10W) in 0805 (2012 Metric) surface mount package. This component features moisture-resistant construction with a temperature coefficient of ±100ppm/°C and operates across -55°C to 155°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts maintain the same resistance value, tolerance, and package footprint while offering enhanced specifications or active manufacturing status.

Key Parameters

Parameter	Value
Resistance	249 kOhms
Tolerance	±0.5%
Power Rating	0.1W (1/10W)
Package / Case	0805 (2012 Metric)
Composition	Thin Film
Operating Temperature Range	-55°C ~ 155°C
Temperature Coefficient	±100ppm/°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of RN732ATTD2493D100 is determined by the following critical parameters:

Mandatory Matching Parameters:

Resistance value: 249 kOhms
Tolerance: ±0.5%
Package / Case: 0805 (2012 Metric)
Composition: Thin Film
Operating temperature range: -55°C ~ 155°C
RoHS compliance: ROHS3 Compliant

Allowable Variation Parameters:

Power rating: Substitutes may have equal or higher power ratings (0.125W, 0.25W acceptable for 0.1W applications)
Temperature coefficient: May vary (±10ppm/°C to ±100ppm/°C acceptable)
Certifications: Automotive AEC-Q200 and anti-sulfur features are enhancements, not requirements

Substitute parts are grouped into three categories based on power rating upgrades: 0.125W (1/8W) rated alternatives, 0.25W (1/4W) rated alternatives, and same-power 0.1W (1/10W) alternatives. All substitutes maintain identical footprint and electrical specifications within the defined tolerance band.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Package	Status	AEC-Q200
RN732ATTD2493D100	KOA Speer	249 kΩ	±0.5%	0.1	±100	0805	Obsolete	No
RN73R2ATTD2493D100	KOA Speer	249 kΩ	±0.5%	0.125	±100	0805	Active	Yes
AT0805DRD07249KL	YAGEO	249 kΩ	±0.5%	0.125	±25	0805	Active	Yes
AT0805DRE07249KL	YAGEO	249 kΩ	±0.5%	0.125	±50	0805	Active	Yes
RG2012N-2493-D-T5	Susumu	249 kΩ	±0.5%	0.125	±10	0805	Active	Yes
RG2012P-2493-D-T5	Susumu	249 kΩ	±0.5%	0.125	±25	0805	Active	Yes
RN73G2A249KDTDF	TE Connectivity	249 kΩ	±0.5%	0.1	±50	0805	Active	No
RNCF0805DKC249K	Stackpole	249 kΩ	±0.5%	0.25	±50	0805	Active	Yes
RNCF0805DKE249K	Stackpole	249 kΩ	±0.5%	0.25	±25	0805	Active	Yes
RNCF0805DTC249K	Stackpole	249 kΩ	±0.5%	0.25	±50	0805	Active	Yes
RNCF0805DTE249K	Stackpole	249 kΩ	±0.5%	0.25	±25	0805	Active	Yes

Engineering Selection Recommendations

Direct Replacement (Same Power Rating): RN73G2A249KDTDF from TE Connectivity maintains the 0.1W power rating of the original RN732ATTD2493D100. This part is active in production and ROHS3 compliant. Temperature coefficient is ±50ppm/°C, which is tighter than the original ±100ppm/°C specification. This option is suitable for applications where power budget constraints require matching the original 0.1W rating.

Recommended Upgrade (Enhanced Power Rating): RN73R2ATTD2493D100 from KOA Speer provides a direct manufacturer upgrade path with 0.125W (1/8W) power rating and active AEC-Q200 automotive qualification. This part maintains KOA Speer manufacturing continuity while offering improved thermal margin. Temperature coefficient remains ±100ppm/°C, matching the original specification.

Higher Power Alternatives (0.25W Rating): Stackpole RNCF series parts (RNCF0805DKE249K, RNCF0805DTE249K) offer 0.25W power rating with AEC-Q200 certification. These components provide maximum thermal headroom and are suitable for applications requiring enhanced power dissipation capability. Temperature coefficients range from ±25ppm/°C to ±50ppm/°C.

Precision Temperature Coefficient Option: RG2012N-2493-D-T5 from Susumu provides the tightest temperature coefficient specification at ±10ppm/°C with 0.125W power rating and AEC-Q200 qualification. This part is specified for applications requiring superior temperature stability.

All recommended substitutes are ROHS3 compliant, MSL 1 rated, and maintain the 0805 (2012 Metric) package footprint for direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a higher power-rated resistor as a substitute for the RN732ATTD2493D100?

A: Yes. The RN732ATTD2493D100 is rated at 0.1W. Substitutes with 0.125W or 0.25W ratings are electrically compatible and provide additional thermal margin. The 0805 package footprint remains identical across all power ratings listed. Higher power ratings do not degrade circuit performance in applications designed for 0.1W components.

Q: What is the significance of the temperature coefficient specification?

A: Temperature coefficient indicates resistance value drift per degree Celsius change. The original part specifies ±100ppm/°C. Substitute parts with lower temperature coefficients (±10ppm/°C to ±50ppm/°C) provide improved stability across the -55°C to 155°C operating range. For general applications, this variation is acceptable. For precision analog circuits, lower temperature coefficient options are preferred.

Q: Are AEC-Q200 certified parts required for this application?

A: AEC-Q200 certification is not required for the original RN732ATTD2493D100. However, most active substitute parts include this automotive qualification. AEC-Q200 certification indicates enhanced reliability testing and is beneficial for automotive, industrial, and mission-critical applications. Non-AEC-Q200 parts (such as RN73G2A249KDTDF) remain fully compatible for general-purpose applications.

Q: Will substitute parts fit the same PCB footprint?

A: All listed substitute parts use the 0805 (2012 Metric) package with identical footprint dimensions: 0.079" L × 0.049" W (2.00mm × 1.25mm). Height variations exist (0.020" to 0.026" seated height), but these do not affect PCB assembly compatibility. Direct board-level substitution is possible without layout modifications.

Q: What is the difference between RN73R2ATTD2493D100 and RN732ATTD2493D100?

A: RN73R2ATTD2493D100 is the active production equivalent with enhanced specifications. The "R" designation indicates automotive AEC-Q200 qualification and 0.125W power rating versus the original 0.1W. Both parts share identical resistance (249 kΩ), tolerance (±0.5%), package (0805), and temperature range (-55°C to 155°C). The upgrade provides improved thermal performance and active manufacturing status.

Q: Can I substitute YAGEO AT0805 series parts for KOA Speer RN73 series?

A: Yes. YAGEO AT0805DRD07249KL and AT0805DRE07249KL are functionally equivalent substitutes. Both maintain 249 kΩ resistance, ±0.5% tolerance, 0805 package, and -55°C to 155°C operating range. YAGEO parts include anti-sulfur coating and AEC-Q200 certification. Temperature coefficients differ (±25ppm/°C and ±50ppm/°C respectively), but both are acceptable for general applications.

Q: Which substitute offers the best value for cost-sensitive applications?

A: RN73G2A249KDTDF from TE Connectivity maintains the original 0.1W power rating while offering active production status and ROHS3 compliance. This part provides direct functional equivalence without power rating upgrade costs. For applications where thermal margin is not critical, this option delivers equivalent performance at competitive pricing.

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