RK73B1HTTC394J Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC394J is a 390 kOhms ±5% thick film chip resistor rated at 0.05W (1/20W) in 0201 package format (0.60mm x 0.30mm). Manufactured by KOA Speer Electronics, Inc., this component is AEC-Q200 automotive qualified and RoHS3 compliant. The part is designated as Not For New Designs, indicating obsolescence in the original product line. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for existing applications.

Key Parameters

Parameter	Value
Resistance	390 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
Size / Dimension	0.024" L x 0.012" W (0.60mm x 0.30mm)
Height - Seated (Max)	0.010" (0.26mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	ROHS3 Compliant
AEC-Q200 Rating	Yes

Substitute Part Grouping Explanation

Substitution of the RK73B1HTTC394J is determined by strict equivalence across the following critical parameters:

Direct Equivalence Criteria:

Resistance value: 390 kOhms (exact match required)
Tolerance: ±5% (matching tolerance band)
Power rating: 0.05W / 1/20W (exact match required)
Package: 0201 (0603 Metric) (physical and electrical compatibility)
Composition: Thick Film (material consistency)
Temperature coefficient: ±200ppm/°C (thermal stability)
Operating temperature range: -55°C ~ 155°C (environmental compatibility)
Termination count: 2 (standard SMD configuration)
RoHS3 compliance: Required for regulatory alignment
MSL rating: 1 (Unlimited) (moisture handling capability)

Substitute Categories:

Direct Manufacturer Equivalents (Active Status): Parts meeting all parameters with Active product status, suitable for immediate replacement in new procurement.
Manufacturer Recommended Equivalent: KOA Speer Electronics RK73B1HTTCM394J, representing the active-status successor within the same manufacturer series.
Cross-Manufacturer Direct Equivalents: YAGEO AC0201JR-07390KL, Vishay Dale CRCW0201390KJNED, and Panasonic ERJ-1GNJ394C, all meeting identical electrical and mechanical specifications with Active status.
Obsolete Equivalents (Limited Use): Panasonic ERJ-1GEJ394C maintains full parameter equivalence but carries Obsolete status; available inventory exists but future availability is not guaranteed.
Tolerance Upgrade Options: CRCW0201390KFKED, CRCW0201390KFNED, ERJ-1GEF3903C, and ERJ-1GNF3903C provide ±1% tolerance with identical resistance and power rating, suitable for applications requiring tighter tolerance specifications.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Op. Temp Range (°C)	Package	Product Status	Inventory (Pcs)
RK73B1HTTC394J	KOA Speer	390k	±5%	0.05	±200	-55 ~ 155	0201	Not For New Designs	978
RK73B1HTTCM394J	KOA Speer	390k	±5%	0.05	±200	-55 ~ 155	0201	Active	989
AC0201JR-07390KL	YAGEO	390k	±5%	0.05	±200	-55 ~ 155	0201	Active	1056
CRCW0201390KJNED	Vishay Dale	390k	±5%	0.05	±200	-55 ~ 155	0201	Active	697
ERJ-1GEJ394C	Panasonic	390k	±5%	0.05	±200	-55 ~ 125	0201	Obsolete	21250
ERJ-1GNJ394C	Panasonic	390k	±5%	0.05	±200	-55 ~ 125	0201	Active	73715
RC0201JR-07390KL	YAGEO	390k	±5%	0.05	±200	-55 ~ 125	0201	Active	13909
CRCW0201390KFKED	Vishay Dale	390k	±1%	0.05	±100	-55 ~ 155	0201	Active	11043
CRCW0201390KFNED	Vishay Dale	390k	±1%	0.05	±200	-55 ~ 155	0201	Active	11921
ERJ-1GEF3903C	Panasonic	390k	±1%	0.05	±200	-55 ~ 125	0201	Obsolete	746
ERJ-1GNF3903C	Panasonic	390k	±1%	0.05	±200	-55 ~ 125	0201	Active	206936

Engineering Selection Recommendations

Primary Selection (Direct Equivalents - Active Status):

For new procurement and ongoing production, select from the following Active-status direct equivalents:

RK73B1HTTCM394J (KOA Speer): Recommended as the primary replacement within the original manufacturer's active product line. Maintains identical electrical and thermal specifications with extended operating temperature range (-55°C ~ 155°C). Suitable for automotive applications requiring AEC-Q200 compliance.
ERJ-1GNJ394C (Panasonic): Largest available inventory (73,715 pcs) with Active status. Meets all electrical parameters with operating temperature range of -55°C ~ 125°C. Appropriate for applications not requiring the extended upper temperature limit of 155°C.
AC0201JR-07390KL (YAGEO): Active status with moisture-resistant thick film composition. Operating temperature range -55°C ~ 155°C matches the original specification. Suitable for moisture-sensitive environments.
RC0201JR-07390KL (YAGEO): Active status with moisture-resistant features. Operating temperature range -55°C ~ 125°C. Provides alternative sourcing from established supplier.
CRCW0201390KJNED (Vishay Dale): Active status with full parameter equivalence. Operating temperature range -55°C ~ 155°C. Established supplier with consistent availability.

Secondary Selection (Tolerance Upgrade - Active Status):

For applications requiring improved tolerance specifications:

CRCW0201390KFNED (Vishay Dale): ±1% tolerance with ±200ppm/°C temperature coefficient. Operating temperature range -55°C ~ 155°C. Recommended when tighter tolerance is required without temperature coefficient compromise.
ERJ-1GNF3903C (Panasonic): ±1% tolerance with extensive inventory (206,936 pcs). Operating temperature range -55°C ~ 125°C. Suitable for high-volume applications requiring improved tolerance.

Compliance Verification:

All recommended parts maintain RoHS3 compliance, MSL rating of 1 (Unlimited), and REACH Unaffected status, ensuring regulatory alignment with the original component.

Operating Temperature Consideration:

Applications requiring the full -55°C ~ 155°C operating range must select from: RK73B1HTTCM394J, AC0201JR-07390KL, CRCW0201390KJNED, CRCW0201390KFKED, or CRCW0201390KFNED. Applications limited to -55°C ~ 125°C may select from the broader supplier base including Panasonic and YAGEO RC series options.

Frequently Asked Questions (FAQ)

Q1: Can ERJ-1GEJ394C (Obsolete status) be used as a substitute?

A: ERJ-1GEJ394C meets all electrical and mechanical parameters of the RK73B1HTTC394J with identical 390 kOhms ±5% specification and 0.05W power rating. However, Obsolete product status indicates discontinued manufacturing. While current inventory exists (21,250 pcs), future availability is not guaranteed. Use only when Active-status alternatives are unavailable or when existing inventory is being consumed.

Q2: What is the difference between ±5% and ±1% tolerance options?

A: The RK73B1HTTC394J specifies ±5% tolerance, meaning the actual resistance value falls within 370.5 kOhms to 409.5 kOhms. Upgrade options with ±1% tolerance (CRCW0201390KFNED, ERJ-1GNF3903C) narrow this range to 386.1 kOhms to 393.9 kOhms. Select ±1% tolerance only when circuit design requires tighter resistance accuracy. Standard ±5% tolerance is sufficient for most applications.

Q3: Does operating temperature range affect substitution compatibility?

A: The RK73B1HTTC394J specifies -55°C ~ 155°C. Panasonic parts (ERJ-1GNJ394C, ERJ-1GEJ394C, ERJ-1GNF3903C, ERJ-1GEF3903C) specify -55°C ~ 125°C, a 30°C reduction at the upper limit. For applications operating above 125°C, select from KOA Speer, YAGEO AC series, or Vishay Dale CRCW series. For applications with maximum operating temperature at or below 125°C, Panasonic options are fully compatible.

Q4: What is the significance of "Moisture Resistant" in AC0201JR-07390KL and RC0201JR-07390KL?

A: Both YAGEO parts specify moisture-resistant thick film composition. This feature provides enhanced protection against moisture ingress during storage and operation in humid environments. The original RK73B1HTTC394J does not specify this feature but maintains MSL rating of 1 (Unlimited), indicating no moisture sensitivity limitation. Moisture-resistant variants are suitable for applications in high-humidity or marine environments.

Q5: Are all substitute parts suitable for automotive applications?

A: The RK73B1HTTC394J carries AEC-Q200 automotive qualification. Direct equivalent RK73B1HTTCM394J and AC0201JR-07390KL explicitly specify AEC-Q200 rating. Other substitutes (CRCW0201390KJNED, ERJ-1GNJ394C, RC0201JR-07390KL) do not list AEC-Q200 in provided specifications. For automotive applications requiring AEC-Q200 compliance, select RK73B1HTTCM394J or AC0201JR-07390KL.

Q6: What packaging formats are available?

A: The RK73B1HTTC394J is supplied in Tape & Reel (TR) format. Substitute parts are available in: Tape & Reel (TR) - RK73B1HTTCM394J, AC0201JR-07390KL, CRCW0201390KJNED, ERJ-1GNJ394C, RC0201JR-07390KL, CRCW0201390KFKED, CRCW0201390KFNED, ERJ-1GNF3903C; Cut Tape (CT) & Digi-Reel® - ERJ-1GEJ394C, ERJ-1GEF3903C. Verify packaging format compatibility with assembly equipment before procurement.

Q7: Which substitute offers the largest available inventory?

A: ERJ-1GNF3903C (Panasonic, ±1% tolerance upgrade) provides the largest inventory at 206,936 pcs. For direct ±5% equivalents, ERJ-1GNJ394C offers 73,715 pcs. For applications requiring immediate high-volume supply, these Panasonic options provide the most reliable availability.

Q8: Can I use CRCW0201390KFKED instead of CRCW0201390KFNED?

A: Both are Vishay Dale ±1% tolerance upgrades with identical resistance, power rating, and package. CRCW0201390KFKED specifies ±100ppm/°C temperature coefficient with -55°C ~ 155°C operating range. CRCW0201390KFNED specifies ±200ppm/°C temperature coefficient with -55°C ~ 155°C operating range. Select CRCW0201390KFKED for applications requiring superior temperature stability; select CRCW0201390KFNED for standard thermal performance with ±1% tolerance.

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