RK73B1HTTC124J Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC124J is a 120 kOhms ±5% thick film chip resistor rated at 0.05W (1/20W) in 0201 package format (0.60mm x 0.30mm metric). This component is manufactured by KOA Speer Electronics, Inc. and carries AEC-Q200 automotive qualification. The part is currently classified as Not For New Designs, indicating that while functional equivalents exist, this specific model number should not be selected for new circuit designs. Identifying suitable substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and leverage active product alternatives with equivalent or enhanced electrical characteristics.

Key Parameters

Parameter	Value
Resistance	120 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)

Substitute Part Grouping Explanation

Substitute parts for the RK73B1HTTC124J are classified into three categories based on electrical and mechanical compatibility:

Direct Equivalents maintain identical electrical specifications: 120 kOhms resistance, ±5% tolerance, 0.05W power rating, 0201 package, ±200ppm/°C temperature coefficient, and -55°C to 155°C operating range. These parts are interchangeable without circuit redesign.

Upgrade Options provide enhanced tolerance specifications (±1% instead of ±5%) while maintaining all other electrical parameters. These parts offer improved accuracy and are backward-compatible with designs specified for ±5% tolerance.

Similar Parts share the same resistance, tolerance, and package but may differ in operating temperature range or product status. These require verification of temperature requirements before substitution.

The critical parameters determining substitution eligibility are:

Resistance value (120 kOhms)
Package format (0201)
Power rating (0.05W minimum)
Tolerance (±5% or better)
Operating temperature range (must meet or exceed -55°C to 155°C)
RoHS3 compliance
Moisture Sensitivity Level 1

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Product Status	Automotive Rating
RK73B1HTTC124J	KOA Speer Electronics, Inc.	120 kOhms	±5%	0.05	±200	-55 ~ 155	Not For New Designs	AEC-Q200
RK73B1HTTCM124J	KOA Speer Electronics, Inc.	120 kOhms	±5%	0.05	±200	-55 ~ 155	Active	AEC-Q200
AC0201JR-07120KL	YAGEO	120 kOhms	±5%	0.05	±200	-55 ~ 155	Active	AEC-Q200
CRCW0201120KJNED	Vishay Dale	120 kOhms	±5%	0.05	±200	-55 ~ 155	Active	Not specified
ERJ-1GNJ124C	Panasonic Electronic Components	120 kOhms	±5%	0.05	±200	-55 ~ 125	Active	Not specified
CRCW0201120KFKED	Vishay Dale	120 kOhms	±1%	0.05	±100	-55 ~ 155	Active	Not specified
CRCW0201120KFNED	Vishay Dale	120 kOhms	±1%	0.05	±200	-55 ~ 155	Active	Not specified
ERJ-1GNF1203C	Panasonic Electronic Components	120 kOhms	±1%	0.05	±200	-55 ~ 125	Active	Not specified
RC0201FR-07120KL	YAGEO	120 kOhms	±1%	0.05	±200	-55 ~ 125	Active	Not specified
ERJ-1GEJ124C	Panasonic Electronic Components	120 kOhms	±5%	0.05	±200	-55 ~ 125	Obsolete	Not specified

Engineering Selection Recommendations

Primary Recommendation: RK73B1HTTCM124J

The RK73B1HTTCM124J from KOA Speer Electronics, Inc. is the preferred direct equivalent. This part maintains identical electrical specifications to the RK73B1HTTC124J while carrying Active product status. It provides AEC-Q200 automotive qualification, ROHS3 compliance, and the full -55°C to 155°C operating temperature range. Selection of this part ensures design continuity with no circuit modifications required.

Secondary Recommendation: AC0201JR-07120KL

The AC0201JR-07120KL from YAGEO is a direct electrical equivalent with Active status and AEC-Q200 qualification. This part includes moisture-resistant thick film construction and maintains the full operating temperature range. It is suitable for applications requiring automotive-grade reliability.

Tertiary Recommendation: CRCW0201120KJNED

The CRCW0201120KJNED from Vishay Dale provides direct electrical equivalence with Active status. This part is suitable for general applications where automotive qualification is not mandatory. Operating temperature range is -55°C to 155°C.

Upgrade Options for Enhanced Tolerance:

The CRCW0201120KFKED, CRCW0201120KFNED, ERJ-1GNF1203C, and RC0201FR-07120KL offer ±1% tolerance specifications. These upgrades are appropriate for designs requiring tighter resistance tolerances. Note that ERJ-1GNF1203C and RC0201FR-07120KL have reduced upper operating temperature limits (-55°C to 125°C) compared to the original specification.

Parts to Avoid:

ERJ-1GEJ124C carries Obsolete product status and should not be selected for new designs despite functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM124J be used as a direct replacement for RK73B1HTTC124J?

A: Yes. The RK73B1HTTCM124J is electrically and mechanically identical to the RK73B1HTTC124J. Both parts have 120 kOhms resistance, ±5% tolerance, 0.05W power rating, 0201 package, and -55°C to 155°C operating range. The primary difference is product status: RK73B1HTTCM124J is Active while RK73B1HTTC124J is Not For New Designs.

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 a 120 kOhm resistor can range from 114 kOhms to 126 kOhms. A ±1% part ranges from 118.8 kOhms to 121.2 kOhms. Upgrade to ±1% tolerance parts when circuit design requires tighter resistance accuracy.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the original part's environmental specifications.

Q: Can I use ERJ-1GNJ124C or ERJ-1GNF1203C if my application operates above 125°C?

A: No. Both ERJ-1GNJ124C and ERJ-1GNF1203C have maximum operating temperatures of 125°C. The original RK73B1HTTC124J and recommended substitutes RK73B1HTTCM124J, AC0201JR-07120KL, and CRCW0201120KJNED support operation to 155°C. Select these alternatives for high-temperature applications.

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

A: AEC-Q200 is an automotive qualification standard indicating the part meets reliability and performance requirements for automotive applications. RK73B1HTTCM124J and AC0201JR-07120KL carry this rating. Other substitutes do not specify automotive qualification; verify AEC-Q200 requirement before selecting alternatives.

Q: Are there packaging differences between substitute parts?

A: Most substitutes are supplied in Tape & Reel (TR) format. ERJ-1GEJ124C is supplied in Cut Tape (CT) & Digi-Reel® format. Verify packaging compatibility with assembly equipment before procurement.

Q: Why is ERJ-1GEJ124C listed if it is Obsolete?

A: ERJ-1GEJ124C is included for reference purposes only, as it appears in the cross-reference data. Obsolete parts should not be selected for new designs. Active alternatives provide equivalent functionality with ongoing manufacturer support.

Q: Can I substitute a ±1% tolerance part in a circuit designed for ±5%?

A: Yes. A ±1% tolerance part is a superior specification and is backward-compatible with designs specified for ±5% tolerance. The tighter tolerance provides improved circuit accuracy without requiring design modifications.

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