RK73B1HTTC513J Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC513J is a 51 kOhms ±5% 0.05W thick film chip resistor in 0201 package (0603 metric) manufactured by KOA Speer Electronics, Inc. This component is rated for automotive applications under AEC-Q200 standard with operating temperature range of -55°C to 155°C. The part is currently classified as "Not For New Designs," necessitating identification of equivalent and substitute components for ongoing production and maintenance applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer enhanced performance characteristics or improved availability.

Key Parameters

Parameter	Specification
Resistance Value	51 kOhms
Tolerance	±5%
Power Rating	0.05W (1/20W)
Package / Case	0201 (0603 Metric)
Composition	Thick Film
Temperature Coefficient	±200ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Automotive Rating	AEC-Q200
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Physical Dimensions	0.024" L x 0.012" W (0.60mm x 0.30mm)
Height - Seated (Max)	0.010" (0.26mm)
Terminations	2

Substitute Part Grouping Explanation

Substitution logic for the RK73B1HTTC513J is determined by the following critical parameters:

Direct Equivalents (Identical Specifications): Parts maintaining 51 kOhms resistance, ±5% tolerance, 0.05W power rating, 0201 package, thick film composition, ±200ppm/°C temperature coefficient, and -55°C to 155°C operating range qualify as direct equivalents. These parts are interchangeable without circuit redesign.

Tolerance Upgrades (±1% vs ±5%): Parts with ±1% tolerance instead of ±5% are classified as upgrades. These maintain all other electrical and mechanical parameters but provide tighter resistance value control. Tolerance upgrades are suitable for applications requiring improved accuracy without circuit modification.

Automotive Compliance: AEC-Q200 rating is maintained across all equivalent parts. Non-automotive rated alternatives are excluded from direct substitution.

Package Compatibility: All substitute parts maintain 0201 (0603 metric) package dimensions, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Temperature Range Considerations: The main part operates to 155°C. Substitute parts with maximum operating temperature of 125°C represent a functional limitation in high-temperature applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	AEC-Q200	Product Status	Inventory (Pcs)
RK73B1HTTC513J	KOA Speer	51k	±5%	0.05	±200	-55 ~ 155	Yes	Not For New Designs	10,100
RK73B1HTTCM513J	KOA Speer	51k	±5%	0.05	±200	-55 ~ 155	Yes	Active	739
AC0201JR-0751KL	YAGEO	51k	±5%	0.05	±200	-55 ~ 155	Yes	Active	707
CRCW020151K0JNED	Vishay Dale	51k	±5%	0.05	±200	-55 ~ 155	No	Active	9,266
ERJ-1GNJ513C	Panasonic	51k	±5%	0.05	±200	-55 ~ 125	No	Active	47,580
RC0201JR-0751KL	YAGEO	51k	±5%	0.05	±200	-55 ~ 125	No	Active	9,034
CRCW020151K0FKED	Vishay Dale	51k	±1%	0.05	±100	-55 ~ 155	No	Active	20,621
CRCW020151K0FNED	Vishay Dale	51k	±1%	0.05	±200	-55 ~ 155	No	Active	933
ERJ-1GNF5102C	Panasonic	51k	±1%	0.05	±200	-55 ~ 125	No	Active	163,628
RC0201FR-0751KL	YAGEO	51k	±1%	0.05	±200	-55 ~ 125	No	Active	323,359

Engineering Selection Recommendations

Primary Equivalent Selection: RK73B1HTTCM513J from KOA Speer Electronics maintains identical electrical and mechanical specifications to the RK73B1HTTC513J while holding Active product status. This part preserves AEC-Q200 automotive compliance and the full -55°C to 155°C operating temperature range. Selection of this part ensures direct compatibility without circuit redesign.

Secondary Equivalent Options: AC0201JR-0751KL (YAGEO) provides equivalent performance with Active status and maintains AEC-Q200 automotive rating. This part includes moisture-resistant thick film composition and supports the full -55°C to 155°C temperature range, making it suitable for automotive applications requiring enhanced environmental protection.

Tolerance Upgrade Alternatives: CRCW020151K0FKED (Vishay Dale) and CRCW020151K0FNED (Vishay Dale) offer ±1% tolerance with improved temperature coefficient stability (±100ppm/°C for CRCW020151K0FKED). These upgrades maintain the -55°C to 155°C operating range and are appropriate for applications requiring tighter resistance value control.

High-Availability Alternatives: ERJ-1GNF5102C (Panasonic) and RC0201FR-0751KL (YAGEO) provide ±1% tolerance upgrades with significantly higher inventory levels (163,628 and 323,359 units respectively). These parts operate to -55°C to 125°C, which is suitable for applications not requiring the extended 155°C upper temperature limit.

Temperature-Constrained Applications: For applications limited to -55°C to 125°C operating range, ERJ-1GNJ513C (Panasonic) and RC0201JR-0751KL (YAGEO) serve as direct ±5% tolerance equivalents with high availability and Active product status.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM513J directly replace RK73B1HTTC513J?

A: Yes. RK73B1HTTCM513J maintains identical resistance value (51 kOhms), tolerance (±5%), power rating (0.05W), package (0201), temperature coefficient (±200ppm/°C), and operating temperature range (-55°C to 155°C). Both parts are AEC-Q200 rated and ROHS3 compliant. Direct substitution requires no circuit modification.

Q: What is the difference between ±5% and ±1% tolerance parts?

A: Tolerance specifies the allowable deviation from the nominal resistance value. A ±5% part on 51 kOhms allows resistance between 48.45 kOhms and 53.55 kOhms. A ±1% part allows resistance between 50.49 kOhms and 51.51 kOhms. Tighter tolerance (±1%) provides improved accuracy for precision circuits but does not affect electrical function in general applications.

Q: Are non-AEC-Q200 parts suitable for automotive applications?

A: AEC-Q200 certification indicates automotive-grade qualification including reliability testing and failure rate analysis. Parts without AEC-Q200 rating (such as CRCW020151K0JNED, ERJ-1GNJ513C, and RC0201JR-0751KL) are not qualified for automotive applications requiring this certification. Use only AEC-Q200 rated parts for automotive designs.

Q: What is the impact of operating temperature range differences?

A: The main part RK73B1HTTC513J operates to 155°C maximum. Substitute parts with -55°C to 125°C range (ERJ-1GNJ513C, RC0201JR-0751KL, ERJ-1GNF5102C, RC0201FR-0751KL) are unsuitable for applications requiring operation above 125°C. Verify application temperature requirements before selecting temperature-limited alternatives.

Q: Can 0201 package parts be used interchangeably on the same PCB?

A: Yes. All substitute parts maintain 0201 (0603 metric) package dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm) with maximum seated height of 0.010" (0.26mm). Physical compatibility with PCB footprints and assembly equipment is maintained across all listed parts.

Q: What does ROHS3 Compliant status indicate?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory conformance for EU and equivalent markets.

Q: Which substitute part offers the best availability?

A: RC0201FR-0751KL (YAGEO) provides the highest inventory level at 323,359 units. This ±1% tolerance upgrade operates to -55°C to 125°C and is suitable for applications not requiring extended high-temperature operation.

Q: Is moisture resistance a critical parameter for substitution?

A: Moisture resistance is not a critical substitution parameter for the RK73B1HTTC513J, which carries Moisture Sensitivity Level 1 (Unlimited). Parts with moisture-resistant features (AC0201JR-0751KL, RC0201JR-0751KL, RC0201FR-0751KL) provide additional environmental protection but are not required for direct equivalence.

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