RT0402FRE07178KL Equivalent & Substitute Parts

Part Overview

The RT0402FRE07178KL is a 178 kOhms ±1% thin film chip resistor manufactured by YAGEO in the 0402 (1005 Metric) package format. This component is rated for 0.063W (1/16W) power dissipation with a temperature coefficient of ±50ppm/°C and operates across -55°C to 155°C. The part is ROHS3 compliant, moisture resistant, and maintains unlimited moisture sensitivity level (MSL 1). As an active product with 935 units in stock, substitute parts may be required for design flexibility, supply chain optimization, or specific application requirements such as automotive qualification or enhanced tolerance specifications.

Substiute Parts

RT0402FRE07178KL

YAGEOIn Stock: 1010RT0402FRE07178KL Datasheet

Current PartRFQ

ERJ-2RKF1783X

Panasonic Electronic ComponentsIn Stock: 228968ERJ-2RKF1783X Datasheet

DirectRFQ

RG1005P-1781-B-T5

SusumuIn Stock: 34453RG1005P-1781-B-T5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RT0402FRE07178KL is determined by the following critical parameters:

• Resistance Value: Must be 178 kOhms (exact match required)
• Package Format: Must be 0402 (1005 Metric) for mechanical and electrical compatibility
• Operating Temperature Range: Must support -55°C to 155°C minimum
• Compliance Standards: Must maintain ROHS3 compliance and REACH unaffected status
• Tolerance & Power Rating: Tolerance of ±1% or better and power rating of 0.063W or greater are acceptable

Two substitute parts meet these criteria with variations in composition, temperature coefficient, and additional certifications.

Parameter Comparison

Engineering Selection Recommendations

ERJ-2RKF1783X (Panasonic): This substitute maintains the exact 178 kOhms resistance and ±1% tolerance with identical package and temperature range. The higher power rating (0.1W vs. 0.063W) provides additional thermal margin. Automotive AEC-Q200 qualification makes this suitable for automotive applications. The thick film composition and ±100ppm/°C temperature coefficient represent trade-offs in stability compared to the original thin film design. Extensive inventory availability (228,940 units) supports supply chain continuity.

RG1005P-1781-B-T5 (Susumu): This part exhibits a critical resistance mismatch (1.78 kOhms vs. 178 kOhms), representing a 100-fold difference. This part is not electrically equivalent and cannot serve as a direct substitute for the RT0402FRE07178KL. The superior tolerance (±0.1%), lower temperature coefficient (±25ppm/°C), and automotive AEC-Q200 qualification with anti-sulfur features are irrelevant given the fundamental resistance incompatibility.

For direct substitution, ERJ-2RKF1783X is the only viable option among the provided alternatives.

Frequently Asked Questions (FAQ)

Q: Can ERJ-2RKF1783X replace RT0402FRE07178KL in all applications?

A: ERJ-2RKF1783X maintains electrical equivalence in resistance value, tolerance, package, and operating temperature range. The higher power rating (0.1W vs. 0.063W) is compatible with circuits designed for the original 0.063W specification. The primary difference is composition (thick film vs. thin film) and temperature coefficient (±100ppm/°C vs. ±50ppm/°C). Applications requiring the original thin film characteristics or tighter temperature stability should evaluate this trade-off.

Q: Why is RG1005P-1781-B-T5 listed as a substitute if the resistance is different?

A: RG1005P-1781-B-T5 is not a valid substitute for RT0402FRE07178KL. The 1.78 kOhms resistance differs by a factor of 100 from the required 178 kOhms. This part should not be selected for direct replacement applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both ERJ-2RKF1783X and RG1005P-1781-B-T5 maintain ROHS3 compliance and REACH unaffected status, matching the original RT0402FRE07178KL specification.

Q: What is the mechanical compatibility of substitute parts?

A: All parts use the 0402 (1005 Metric) package with identical footprint dimensions (0.039" L x 0.020" W / 1.00mm x 0.50mm). Height variations are minimal (0.35mm to 0.40mm maximum seated height), ensuring PCB assembly compatibility without design modification.

Q: Does the higher power rating of ERJ-2RKF1783X affect circuit performance?

A: No. A higher power rating indicates greater thermal capacity and does not degrade performance in circuits designed for lower power dissipation. The 0.1W rating of ERJ-2RKF1783X is fully backward compatible with applications specified for 0.063W.