RN731JTTD3573F100 Equivalent & Substitute Parts

Part Overview

The RN731JTTD3573F100 is a 357 kOhms ±1% thin film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.063W (1/16W) in a 0603 (1608 Metric) surface-mount package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. The resistor features moisture-resistant construction with a temperature coefficient of ±100ppm/°C and operates across the -55°C to 155°C temperature range. Substitution is required to maintain supply chain availability while preserving circuit performance and reliability specifications.

Substiute Parts

RN731JTTD3573F100

KOA Speer Electronics, Inc.In Stock: 753RN731JTTD3573F100 Datasheet

Current PartRFQ

RN73R1JTTD3573F100

KOA Speer Electronics, Inc.In Stock: 1075RN73R1JTTD3573F100 Datasheet

DirectRFQ

CPF0603F357KC1

TE Connectivity Passive ProductIn Stock: 816CPF0603F357KC1 Datasheet

UpgradeRFQ

MCT06030C3573FP500

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 701MCT06030C3573FP500 Datasheet

UpgradeRFQ

RT0603FRD07357KL

YAGEOIn Stock: 871RT0603FRD07357KL Datasheet

UpgradeRFQ

RT0603FRE07357KL

YAGEOIn Stock: 1043RT0603FRE07357KL Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN731JTTD3573F100 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

• Resistance value: 357 kOhms
• Tolerance: ±1%
• Package / Case: 0603 (1608 Metric)
• Composition: Thin Film
• Operating Temperature Range: -55°C ~ 155°C
• Moisture Sensitivity Level: 1 (Unlimited)
• RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

• Power Rating: Substitutes may equal or exceed 0.063W (1/16W)
• Temperature Coefficient: Substitutes may equal or be superior (lower absolute value)
• Moisture Resistance: Substitutes may maintain or enhance moisture resistance features

All identified substitutes maintain the 357 kOhms resistance, ±1% tolerance, 0603 package, thin film composition, and full operating temperature range. Substitutes are classified as either direct equivalents (matching power rating) or upgrades (higher power rating or improved temperature coefficient).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Matching Power Rating):

CPF0603F357KC1 from TE Connectivity Passive Product is the direct equivalent substitute, maintaining the 0.063W power rating of the original RN731JTTD3573F100. This part offers an improved temperature coefficient of ±50ppm/°C compared to the original ±100ppm/°C specification. The CPF0603F357KC1 is active in production status and fully ROHS3 compliant, providing immediate procurement availability.

Upgrade Substitutes (Higher Power Rating):

Four active substitutes provide upgraded power ratings of 0.1W (1/10W), exceeding the original 0.063W specification:

• RN73R1JTTD3573F100 (KOA Speer Electronics, Inc.): Direct manufacturer upgrade within the same RN73 series family. Maintains ±100ppm/°C temperature coefficient. Includes AEC-Q200 automotive qualification. Active production status with 1054 units in stock.

• MCT06030C3573FP500 (Vishay Beyschlag/Draloric/BC Components): Professional-grade MCT series with anti-sulfur thin film construction. Temperature coefficient of ±50ppm/°C. Active production status with 681 units in stock.

• RT0603FRD07357KL (YAGEO): Superior temperature coefficient of ±25ppm/°C, the lowest among all substitutes. Active production status with 769 units in stock.

• RT0603FRE07357KL (YAGEO): Temperature coefficient of ±50ppm/°C. Active production status with 1032 units in stock, providing highest inventory availability.

All substitutes maintain 0603 package compatibility, ±1% tolerance, -55°C to 155°C operating range, and ROHS3 compliance. Selection between direct equivalent and upgrade substitutes depends on circuit power dissipation requirements and thermal margin specifications.

Frequently Asked Questions (FAQ)

Q: Can the RN731JTTD3573F100 be directly replaced with a higher power-rated substitute?

A: Yes. All identified substitutes with 0.1W (1/10W) power ratings are electrically and mechanically compatible. Higher power ratings provide additional thermal margin and do not degrade circuit performance. The 0603 package dimensions remain identical across all substitutes.

Q: What is the difference between the direct equivalent CPF0603F357KC1 and the upgrade substitutes?

A: The CPF0603F357KC1 maintains the original 0.063W power rating, making it a direct replacement. Upgrade substitutes (RN73R1JTTD3573F100, MCT06030C3573FP500, RT0603FRD07357KL, RT0603FRE07357KL) provide 0.1W power ratings. Upgrade substitutes also feature improved temperature coefficients (±25ppm/°C to ±50ppm/°C versus the original ±100ppm/°C).

Q: Are all substitutes 0603 package compatible with the original design?

A: Yes. All substitutes use the 0603 (1608 Metric) package with identical footprint dimensions (0.063" L x 0.031" W, 1.60mm x 0.80mm) and maximum seated height of 0.022" (0.55mm). PCB layout modifications are not required.

Q: Which substitute offers the best temperature stability?

A: The RT0603FRD07357KL provides the superior temperature coefficient of ±25ppm/°C, compared to ±50ppm/°C for MCT06030C3573FP500 and RT0603FRE07357KL, and ±100ppm/°C for the original RN731JTTD3573F100 and RN73R1JTTD3573F100.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All identified substitutes are ROHS3 compliant, maintaining regulatory compliance with the original part specification.

Q: What is the inventory status of available substitutes?

A: All substitutes are in active production with current stock availability: RN73R1JTTD3573F100 (1054 units), CPF0603F357KC1 (781 units), MCT06030C3573FP500 (681 units), RT0603FRD07357KL (769 units), and RT0603FRE07357KL (1032 units).

Q: Can the RN73R1JTTD3573F100 be used in automotive applications?

A: Yes. The RN73R1JTTD3573F100 carries AEC-Q200 automotive qualification, making it suitable for automotive circuit designs requiring qualified component status.