Equivalent & Substitute Parts for 1676449-3

Part Overview

The TE Connectivity 1676449-3 is a 866 Ohms ±0.1% thin film chip resistor in 0805 (2012 Metric) package rated for 0.1W (1/10W) operation across -55°C to 155°C. This component is part of the RN73 Holsworthy series and carries an obsolete product status. Due to its obsolescence, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term supply chain reliability for new production and field replacements.

Key Parameters

Parameter	Value
Resistance	866 Ohms
Tolerance	±0.1%
Power Rating	0.1W (1/10W)
Package / Case	0805 (2012 Metric)
Composition	Thin Film
Temperature Coefficient	±10ppm/°C
Operating Temperature Range	-55°C to 155°C
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 1676449-3 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Resistance value: 866 Ohms (exact match required)
Package / Case: 0805 (2012 Metric) (exact match required)
Composition: Thin Film (exact match required)
Operating temperature range: -55°C to 155°C (minimum requirement)
Moisture Sensitivity Level: 1 (Unlimited) (minimum requirement)

Allowable Variations:

Power rating: Substitute parts rated at 0.125W (1/8W) or higher satisfy the 0.1W requirement
Tolerance: Substitute parts with equal or tighter tolerance (±0.1%, ±0.05%, ±0.02%) are acceptable
Temperature coefficient: Substitute parts with equal or lower temperature coefficient are acceptable
Compliance certifications: Active product status and automotive AEC-Q200 qualification are beneficial enhancements

All substitute parts listed maintain identical resistance, package, composition, and operating temperature specifications while offering equal or superior electrical performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Product Status	AEC-Q200
1676449-3	TE Connectivity	866 Ω	±0.1%	0.1	±10	-55 to 155	Obsolete	No
RNCF0805BKT866R	Stackpole Electronics	866 Ω	±0.1%	0.125	±10	-55 to 155	Active	Yes
RG2012N-8660-B-T5	Susumu	866 Ω	±0.1%	0.125	±10	-55 to 155	Active	Yes
RG2012N-8660-W-T1	Susumu	866 Ω	±0.05%	0.125	±10	-55 to 155	Active	Yes
RG2012N-8660-W-T5	Susumu	866 Ω	±0.05%	0.125	±10	-55 to 155	Active	Yes
RG2012V-8660-B-T5	Susumu	866 Ω	±0.1%	0.125	±5	-55 to 155	Active	Yes
RG2012V-8660-P-T1	Susumu	866 Ω	±0.02%	0.125	±5	-55 to 155	Active	Yes
RG2012V-8660-W-T1	Susumu	866 Ω	±0.05%	0.125	±5	-55 to 155	Active	Yes
RG2012V-8660-W-T5	Susumu	866 Ω	±0.05%	0.125	±5	-55 to 155	Active	Yes

Engineering Selection Recommendations

Direct Equivalent (Matching Specifications): RNCF0805BKT866R from Stackpole Electronics provides the closest functional equivalent to the 1676449-3. This part maintains identical resistance, tolerance, and temperature coefficient specifications while offering active product status and automotive AEC-Q200 qualification. The increased power rating (0.125W vs. 0.1W) provides additional thermal margin without affecting circuit performance.

Enhanced Performance Alternatives: The Susumu RG series parts (RG2012N and RG2012V variants) offer active product status with automotive AEC-Q200 qualification and anti-sulfur construction. These parts are suitable for applications requiring higher reliability standards:

RG2012N-8660-B-T5 and RG2012N-8660-W-T5 maintain the ±10ppm/°C temperature coefficient of the original part
RG2012V series parts feature improved ±5ppm/°C temperature coefficient, reducing thermal drift
RG2012V-8660-P-T1 provides the tightest tolerance specification (±0.02%) for precision applications

All substitute parts are packaged in 0805 (2012 Metric) format with identical footprint and mounting characteristics. All parts carry ROHS3 compliance and REACH unaffected status. Selection among active alternatives depends on application requirements for tolerance precision and temperature stability.

Frequently Asked Questions (FAQ)

Q: Can RNCF0805BKT866R directly replace 1676449-3 in existing designs? A: Yes. RNCF0805BKT866R maintains identical electrical specifications (866 Ω, ±0.1%, ±10ppm/°C) and package format (0805). The higher power rating (0.125W vs. 0.1W) is a non-limiting enhancement. No circuit redesign is required.

Q: What is the difference between RG2012N and RG2012V series parts? A: Both series are automotive AEC-Q200 qualified with anti-sulfur construction. The primary difference is temperature coefficient: RG2012N maintains ±10ppm/°C (matching the original part), while RG2012V offers improved ±5ppm/°C stability. RG2012V parts are suitable for applications with stricter thermal drift requirements.

Q: Are all substitute parts physically compatible with the original 0805 footprint? A: Yes. All substitute parts are specified as 0805 (2012 Metric) package with identical dimensions (0.079" L x 0.049" W / 2.00mm x 1.25mm). Physical compatibility with existing PCB layouts is confirmed.

Q: What does the tolerance designation (±0.1%, ±0.05%, ±0.02%) mean for circuit performance? A: Tolerance specifies the maximum deviation from the nominal 866 Ω resistance value. Tighter tolerance (lower percentage) ensures more precise resistance values. For most applications, ±0.1% is sufficient. Tighter tolerances (±0.05%, ±0.02%) are beneficial in precision measurement circuits or where resistance matching between multiple components is critical.

Q: Why do some substitute parts have lower height specifications (0.020" vs. 0.026")? A: Height variation is a manufacturing characteristic within the 0805 package specification. The lower height of Susumu parts (0.020" maximum) provides additional clearance in space-constrained designs. Both heights are within standard 0805 specifications and do not affect electrical performance or PCB assembly compatibility.

Q: Are all substitute parts suitable for automotive applications? A: RNCF0805BKT866R and all Susumu RG series parts carry automotive AEC-Q200 qualification. The original 1676449-3 does not carry this certification. For automotive applications, RNCF0805BKT866R or any RG series part is required.

Q: What is the significance of anti-sulfur construction in Susumu RG parts? A: Anti-sulfur construction protects against corrosion in high-sulfur environments. This feature is beneficial for applications in industrial or harsh environments but is not required for standard commercial applications.

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