Equivalent & Substitute Parts for RK73B1HTTC183J

Part Overview

The RK73B1HTTC183J is an 18 kOhms ±5% thick film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.05W (1/20W) in a 0201 (0603 Metric) package. This component is AEC-Q200 automotive qualified and RoHS3 compliant. The part carries a "Not For New Designs" status, indicating that KOA Speer has transitioned this model out of active production. 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	18 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)
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RK73B1HTTC183J is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Resistance value: 18 kOhms (exact match required)
Tolerance: ±5% or tighter (±1% is acceptable as an upgrade)
Power rating: 0.05W (1/20W) minimum
Package: 0201 (0603 Metric) form factor
Composition: Thick film construction
Temperature coefficient: ±200ppm/°C or better
Operating temperature range: Must support -55°C minimum; upper limit of -55°C ~ 155°C or -55°C ~ 125°C both acceptable
Termination count: 2 terminations
RoHS3 compliance required
MSL rating: 1 (Unlimited) acceptable

Substitution Categories:

Direct Equivalents (Identical Specifications): Parts meeting all primary criteria with matching tolerance (±5%) and identical temperature coefficient (±200ppm/°C):

RK73B1HTTCM183J (KOA Speer, Active status)
AC0201JR-0718KL (YAGEO, Active status)
CRCW020118K0JNED (Vishay Dale, Active status)
ERJ-1GNJ183C (Panasonic, Active status)
RC0201JR-0718KL (YAGEO, Active status)

Upgrade Parts (Tighter Tolerance): Parts with improved tolerance specification (±1% vs. ±5%) while maintaining all other mechanical and thermal parameters:

CRCW020118K0FKED (Vishay Dale, ±1% tolerance, ±100ppm/°C)
CRCW020118K0FNED (Vishay Dale, ±1% tolerance, ±200ppm/°C)
ERJ-1GEF1802C (Panasonic, ±1% tolerance, Obsolete status)
ERJ-1GNF1802C (Panasonic, ±1% tolerance, Active status)
RC0201FR-0718KL (YAGEO, ±1% tolerance, Active status)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Package	Product Status	RoHS3
RK73B1HTTC183J	KOA Speer	18k	±5%	0.05	±200	-55 ~ 155	0201	Not For New Designs	Yes
RK73B1HTTCM183J	KOA Speer	18k	±5%	0.05	±200	-55 ~ 155	0201	Active	Yes
AC0201JR-0718KL	YAGEO	18k	±5%	0.05	±200	-55 ~ 155	0201	Active	Yes
CRCW020118K0JNED	Vishay Dale	18k	±5%	0.05	±200	-55 ~ 155	0201	Active	Yes
ERJ-1GNJ183C	Panasonic	18k	±5%	0.05	±200	-55 ~ 125	0201	Active	Yes
RC0201JR-0718KL	YAGEO	18k	±5%	0.05	±200	-55 ~ 125	0201	Active	Yes
CRCW020118K0FKED	Vishay Dale	18k	±1%	0.05	±100	-55 ~ 155	0201	Active	Yes
CRCW020118K0FNED	Vishay Dale	18k	±1%	0.05	±200	-55 ~ 155	0201	Active	Yes
ERJ-1GEF1802C	Panasonic	18k	±1%	0.05	±200	-55 ~ 125	0201	Obsolete	Yes
ERJ-1GNF1802C	Panasonic	18k	±1%	0.05	±200	-55 ~ 125	0201	Active	Yes
RC0201FR-0718KL	YAGEO	18k	±1%	0.05	±200	-55 ~ 125	0201	Active	Yes

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

Select from the following active-status direct equivalents when maintaining the original ±5% tolerance specification is required:

RK73B1HTTCM183J (KOA Speer): Recommended as the primary replacement from the original manufacturer. Active product status ensures long-term availability and supply chain continuity. Identical electrical and thermal characteristics to the obsolete RK73B1HTTC183J.
AC0201JR-0718KL (YAGEO): Active status with moisture-resistant thick film construction. Supports full operating temperature range (-55°C ~ 155°C). High inventory availability (1,058 pcs).
CRCW020118K0JNED (Vishay Dale): Active status with extensive inventory (4,662 pcs). Meets all electrical and mechanical specifications. Supports full operating temperature range (-55°C ~ 155°C).
ERJ-1GNJ183C (Panasonic): Active status with highest inventory availability (83,245 pcs). Operating temperature range limited to -55°C ~ 125°C; suitable for applications not requiring the full 155°C upper limit.
RC0201JR-0718KL (YAGEO): Active status with moisture-resistant construction. Operating temperature range -55°C ~ 125°C. High inventory (13,267 pcs).

For Upgraded Performance (±1% Tolerance):

Select from the following when improved tolerance specification provides design margin or circuit performance benefits:

ERJ-1GNF1802C (Panasonic): Recommended upgrade option. Active status with highest inventory (110,544 pcs). ±1% tolerance with ±200ppm/°C temperature coefficient. Operating range -55°C ~ 125°C.
RC0201FR-0718KL (YAGEO): Active status with moisture-resistant construction. ±1% tolerance. Highest inventory availability among upgrade options (206,864 pcs). Operating range -55°C ~ 125°C.
CRCW020118K0FKED (Vishay Dale): Active status with ±1% tolerance and superior ±100ppm/°C temperature coefficient. Supports full operating range (-55°C ~ 155°C). Inventory: 50,408 pcs.
CRCW020118K0FNED (Vishay Dale): Active status with ±1% tolerance and ±200ppm/°C temperature coefficient. Supports full operating range (-55°C ~ 155°C). Inventory: 9,444 pcs.

Avoid:

ERJ-1GEF1802C (Panasonic): Obsolete product status. Use ERJ-1GNF1802C as the active alternative from Panasonic.

Compliance Verification:

All recommended parts maintain RoHS3 compliance, MSL rating of 1 (Unlimited), and REACH unaffected status. All parts are classified under ECCN EAR99 and HTSUS 8533.21.0030.

Frequently Asked Questions (FAQ)

Q1: Can I use a ±1% tolerance part as a direct replacement for the ±5% RK73B1HTTC183J?

A: Yes. A ±1% tolerance part is a functional upgrade and is fully compatible. The tighter tolerance specification means the actual resistance value will be closer to the nominal 18 kOhms, which is acceptable in any circuit designed for ±5% tolerance. No circuit redesign is required.

Q2: What is the difference between the operating temperature ranges -55°C ~ 155°C and -55°C ~ 125°C?

A: The upper operating limit differs by 30°C. Parts rated to 155°C (RK73B1HTTCM183J, AC0201JR-0718KL, CRCW020118K0JNED, CRCW020118K0FKED, CRCW020118K0FNED) are suitable for high-temperature applications. Parts rated to 125°C (ERJ-1GNJ183C, RC0201JR-0718KL, ERJ-1GEF1802C, ERJ-1GNF1802C, RC0201FR-0718KL) are suitable for standard industrial and automotive applications. Select based on your application's maximum operating temperature requirement.

Q3: Why do some parts have different temperature coefficients (±100ppm/°C vs. ±200ppm/°C)?

A: Temperature coefficient indicates how much the resistance value changes per degree Celsius. CRCW020118K0FKED has ±100ppm/°C, meaning superior stability across temperature variations. This is beneficial for precision circuits but not required for general applications. The original RK73B1HTTC183J specifies ±200ppm/°C, so parts with ±200ppm/°C are direct equivalents, while ±100ppm/°C represents improved performance.

Q4: What does "Not For New Designs" status mean for the RK73B1HTTC183J?

A: This designation indicates that KOA Speer has discontinued active development and marketing of this part number. While existing inventory may be available, the manufacturer recommends using the active equivalent RK73B1HTTCM183J for new designs. For ongoing production support and long-term availability, select from parts with "Active" status.

Q5: Are all substitute parts available in Tape & Reel (TR) packaging?

A: Most direct equivalents are available in Tape & Reel packaging. RC0201FR-0718KL and ERJ-1GEF1802C are supplied in Cut Tape (CT) & Digi-Reel® packaging. Verify packaging requirements with your procurement process before finalizing part selection.

Q6: Which substitute part has the highest inventory availability?

A: RC0201FR-0718KL (YAGEO) has the highest inventory at 206,864 pcs. This part is a ±1% upgrade option with moisture-resistant construction. For direct ±5% equivalents, ERJ-1GNJ183C (Panasonic) has the highest availability at 83,245 pcs.

Q7: Can I mix different manufacturers' parts in the same production batch?

A: Yes. All recommended parts meet identical electrical specifications (18 kOhms, ±5% or ±1%, 0.05W), mechanical dimensions (0201 package), and compliance requirements (RoHS3, MSL 1). They are electrically and mechanically interchangeable. However, verify your quality assurance and traceability requirements before implementing multi-source procurement.

Q8: What is the significance of "Moisture Resistant" in the part description?

A: Moisture-resistant thick film construction (noted in AC0201JR-0718KL and RC0201JR-0718KL) provides enhanced protection against moisture absorption and environmental stress. This is beneficial for applications exposed to high humidity or thermal cycling. Standard thick film parts (without moisture-resistant designation) are suitable for controlled manufacturing and storage environments.

Q9: Are automotive AEC-Q200 certifications maintained across all substitute parts?

A: No. The original RK73B1HTTC183J carries AEC-Q200 automotive qualification. Direct equivalent RK73B1HTTCM183J and AC0201JR-0718KL maintain this certification. Other substitutes (CRCW020118K0JNED, ERJ-1GNJ183C, RC0201JR-0718KL) do not list AEC-Q200 ratings in their specifications. If automotive qualification is a design requirement, select RK73B1HTTCM183J or AC0201JR-0718KL.

Q10: What is the difference between "Base Product Number" and the full part number?

A: The base product number (e.g., RK73B1H, CRCW0201, ERJ-1GN) represents the core product family. The full part number includes additional suffixes that specify resistance value, tolerance, packaging, and other variants. For example, RK73B1HTTC183J breaks down as: RK73B1H (base) + TTC (thick film, automotive) + 183 (18 kOhms) + J (±5% tolerance).

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