RN732ATTD1801F50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD1801F50 is a 1.8 kOhms ±1% 0.1W thin film chip resistor in 0805 (2012 Metric) package manufactured by KOA Speer Electronics, Inc. This part is classified as obsolete. Due to its discontinued status, equivalent and substitute parts from active manufacturers are necessary for ongoing production, redesigns, and maintenance applications. Substitute parts maintain the core electrical specifications while offering enhanced features, improved availability, or upgraded performance characteristics.

Key Parameters

Parameter	Value
Resistance	1.8 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the RN732ATTD1801F50 is determined by the following critical parameters:

Resistance Value: 1.8 kOhms (exact match required)
Tolerance: ±1% or better (±0.5% or ±0.1% acceptable as upgrades)
Package: 0805 (2012 Metric) form factor (mandatory for PCB compatibility)
Composition: Thin film technology (maintains electrical performance characteristics)
Temperature Range: -55°C ~ 155°C minimum (operational compatibility)
RoHS Compliance: ROHS3 Compliant (regulatory requirement)

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications (1.8 kOhms, ±1% tolerance) with equal or higher power ratings and active product status.

Upgrade Options provide enhanced tolerance (±0.5% or ±0.1%), higher power ratings (0.125W or 0.63W), or additional certifications (AEC-Q200, anti-sulfur features) while maintaining core compatibility.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Features	Product Status	RoHS
RN732ATTD1801F50	KOA Speer	1.8 kΩ	±1%	0.1	±50	Moisture Resistant	Obsolete	ROHS3
RN73R2ATTD1801F50	KOA Speer	1.8 kΩ	±1%	0.125	±50	AEC-Q200, Moisture Resistant	Active	ROHS3
RT0805FRE071K8L	YAGEO	1.8 kΩ	±1%	0.125	±50	—	Active	ROHS3
AT0805DRE071K8L	YAGEO	1.8 kΩ	±0.5%	0.125	±50	Anti-Sulfur, AEC-Q200, Moisture Resistant	Active	ROHS3
AT0805FRE071K8L	YAGEO	1.8 kΩ	±1%	0.125	±50	Anti-Sulfur, AEC-Q200, Moisture Resistant	Active	ROHS3
CRT0805-FX-1801ELF	Bourns Inc.	1.8 kΩ	±1%	0.125	±15	Current Sense	Active	ROHS3
MCU08050C1801DP500	Vishay Beyschlag	1.8 kΩ	±0.5%	0.125	±50	Anti-Sulfur	Active	ROHS3
MCU08050C1801FP500	Vishay Beyschlag	1.8 kΩ	±1%	0.125	±50	Anti-Sulfur	Active	ROHS3
MCU08050C1801FPW00	Vishay Beyschlag	1.8 kΩ	±1%	0.125	±50	Anti-Sulfur	Active	ROHS3
PHP00805H1801BBT1	Vishay Dale	1.8 kΩ	±0.1%	0.63	±50	Flame Proof, Moisture Resistant, Safety	Active	Non-compliant
PHP00805H1801BST1	Vishay Dale	1.8 kΩ	±0.1%	0.63	±50	Flame Proof, Moisture Resistant, Safety	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Equivalent Functionality)

RN73R2ATTD1801F50 (KOA Speer) and RT0805FRE071K8L (YAGEO) serve as primary direct equivalents. Both maintain ±1% tolerance, 0.125W power rating, and ROHS3 compliance. RN73R2ATTD1801F50 includes AEC-Q200 automotive qualification, suitable for applications requiring automotive-grade reliability. RT0805FRE071K8L offers high inventory availability (35,083 pcs) and is suitable for general industrial applications.

For Enhanced Tolerance Requirements

AT0805DRE071K8L and MCU08050C1801DP500 provide ±0.5% tolerance, improving circuit accuracy where tighter resistance tolerances are specified. Both are ROHS3 compliant and active products. AT0805DRE071K8L includes AEC-Q200 and anti-sulfur features; MCU08050C1801DP500 is part of Vishay's professional MCU series.

For Precision and Safety-Critical Applications

PHP00805H1801BST1 (Vishay Dale) offers ±0.1% tolerance and 0.63W power rating with flame-proof and safety certifications. This part is suitable for applications requiring high precision and enhanced thermal performance. ROHS3 compliance is confirmed.

For Current Sensing Applications

CRT0805-FX-1801ELF (Bourns) is optimized for current sensing with a lower temperature coefficient (±15ppm/°C) compared to standard thin film resistors. This part is suitable for precision current measurement circuits.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating (0.125W or 0.63W) in place of the 0.1W original?

A: Yes. Higher power ratings are backward compatible. A 0.125W or 0.63W resistor will function correctly in circuits designed for 0.1W, as it provides greater thermal margin and reliability. No circuit redesign is required.

Q: Are parts with ±0.5% or ±0.1% tolerance direct replacements for the ±1% original?

A: Yes. Tighter tolerances (±0.5%, ±0.1%) are superior to ±1% and maintain full compatibility. These upgrades improve circuit accuracy without requiring design changes.

Q: What is the significance of AEC-Q200 certification?

A: AEC-Q200 indicates automotive-grade qualification per the Automotive Electronics Council standard. Parts with this certification are suitable for automotive and high-reliability applications. Non-certified parts are acceptable for general industrial use.

Q: Can I substitute a current sense resistor (CRT0805-FX-1801ELF) in a general-purpose circuit?

A: Yes. Current sense resistors are functionally compatible with standard thin film resistors. The lower temperature coefficient (±15ppm/°C) provides improved stability, making them suitable for precision applications.

Q: Is RoHS compliance mandatory for all substitutes?

A: ROHS3 compliance is required for most applications. PHP00805H1801BBT1 is RoHS non-compliant and should only be used where RoHS exemptions apply or are not required.

Q: Does package size affect substitution?

A: All listed substitutes use the 0805 (2012 Metric) package. Package compatibility is mandatory. Parts in different packages (0603, 1206, etc.) are not interchangeable without PCB redesign.

Q: What inventory considerations should I account for?

A: RT0805FRE071K8L offers the highest inventory (35,083 pcs), ensuring supply continuity. Other active parts maintain adequate stock levels (670–1,115 pcs). Obsolete part RN732ATTD1801F50 has limited remaining inventory (779 pcs).

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