Equivalent & Substitute Parts for RK73B1HTTC433J

Part Overview

The RK73B1HTTC433J is a 43 kOhm ±5% thick film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.05W (1/20W) in 0201 package format (0.60mm x 0.30mm). This component is AEC-Q200 automotive qualified and operates across -55°C to 155°C. The part is classified as "Not For New Designs," indicating it has been superseded. Equivalent and substitute parts are necessary to support existing designs, provide alternative sourcing options, and enable upgrades to higher tolerance specifications where applicable.

Key Parameters

Parameter	Value
Resistance	43 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the RK73B1HTTC433J is determined by the following critical parameters:

Direct Equivalents (Same Specifications):

Resistance: 43 kOhms (exact match required)
Tolerance: ±5% (same tolerance class)
Power Rating: 0.05W, 1/20W (exact match required)
Package: 0201 (0603 Metric) (exact match required)
Composition: Thick Film
Temperature Coefficient: ±200ppm/°C
Operating Temperature: -55°C ~ 155°C (minimum range requirement)
RoHS3 Compliance and MSL 1 rating

Upgrade Substitutes (Enhanced Specifications):

Tolerance: ±1% (tighter tolerance, backward compatible)
All other parameters remain identical to direct equivalents
Temperature Coefficient may vary (±100ppm/°C or ±200ppm/°C)
Operating Temperature: -55°C ~ 155°C (maintained or exceeded)

Parts that do not meet the 0201 package requirement, differ in resistance value, power rating, or composition are not considered substitutes.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Product Status	Inventory (Pcs)
RK73B1HTTC433J	KOA Speer Electronics	43 kOhms	±5%	0.05	±200	-55 ~ 155	Not For New Designs	3,241
RK73B1HTTCM433J	KOA Speer Electronics	43 kOhms	±5%	0.05	±200	-55 ~ 155	Active	721
AC0201JR-0743KL	YAGEO	43 kOhms	±5%	0.05	±200	-55 ~ 155	Active	891
CRCW020143K0JNED	Vishay Dale	43 kOhms	±5%	0.05	±200	-55 ~ 155	Active	789
ERJ-1GNJ433C	Panasonic Electronic Components	43 kOhms	±5%	0.05	±200	-55 ~ 125	Active	78,462
CRCW020143K0FKED	Vishay Dale	43 kOhms	±1%	0.05	±100	-55 ~ 155	Active	12,701
CRCW020143K0FNED	Vishay Dale	43 kOhms	±1%	0.05	±200	-55 ~ 155	Active	11,299
ERJ-1GNF4302C	Panasonic Electronic Components	43 kOhms	±1%	0.05	±200	-55 ~ 125	Active	550,834

Engineering Selection Recommendations

For Direct Replacement (Same Specifications):

Select RK73B1HTTCM433J as the primary recommended substitute. This part is manufactured by KOA Speer Electronics (same manufacturer as the original) and maintains identical electrical and thermal specifications. Product status is Active, ensuring long-term availability and supply chain stability.

Alternative direct equivalents include AC0201JR-0743KL (YAGEO), CRCW020143K0JNED (Vishay Dale), and ERJ-1GNJ433C (Panasonic). All are ROHS3 compliant with MSL 1 rating. ERJ-1GNJ433C offers the highest inventory level (78,462 units), providing superior supply security. Note that ERJ-1GNJ433C operates to -55°C ~ 125°C, which is acceptable for most applications but does not extend to the full 155°C upper limit of the original part.

For Upgraded Performance:

CRCW020143K0FKED and CRCW020143K0FNED (both Vishay Dale) provide ±1% tolerance, improving accuracy over the original ±5% specification. CRCW020143K0FKED additionally reduces temperature coefficient to ±100ppm/°C, enhancing stability across temperature extremes. Both maintain the full -55°C ~ 155°C operating range and are ROHS3 compliant. These upgrades are backward compatible and suitable for applications requiring tighter tolerance control.

ERJ-1GNF4302C (Panasonic) offers ±1% tolerance with ±200ppm/°C temperature coefficient and exceptional inventory availability (550,834 units). Operating temperature is -55°C ~ 125°C, which is suitable for most automotive and industrial applications but does not reach the 155°C maximum of the original specification.

All recommended substitutes are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental qualifications.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM433J be used as a direct replacement for RK73B1HTTC433J?

A: Yes. RK73B1HTTCM433J is a direct equivalent manufactured by the same supplier (KOA Speer Electronics) with identical electrical specifications: 43 kOhms ±5%, 0.05W, 0201 package, ±200ppm/°C temperature coefficient, and -55°C ~ 155°C operating range. The part is Active status, ensuring continued availability.

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

A: Direct equivalents maintain the original ±5% tolerance specification. Upgrade substitutes provide ±1% tolerance, offering improved accuracy and tighter performance control. Upgrades are backward compatible and can be used in applications where the original ±5% tolerance is acceptable, providing enhanced performance without circuit redesign.

Q: Does ERJ-1GNJ433C meet the full operating temperature range of the original part?

A: ERJ-1GNJ433C operates from -55°C ~ 125°C, which does not extend to the 155°C upper limit of RK73B1HTTC433J. This part is suitable for applications with maximum operating temperatures up to 125°C. For applications requiring the full 155°C capability, select RK73B1HTTCM433J, AC0201JR-0743KL, CRCW020143K0JNED, or the upgrade options CRCW020143K0FKED or CRCW020143K0FNED.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental qualifications of the original RK73B1HTTC433J.

Q: Can I use CRCW020143K0FKED in place of the original part?

A: Yes. CRCW020143K0FKED is a backward-compatible upgrade with ±1% tolerance (tighter than the original ±5%), 0.05W power rating, 0201 package, and -55°C ~ 155°C operating range. The reduced temperature coefficient (±100ppm/°C) provides improved thermal stability. This part is suitable for direct replacement with enhanced performance characteristics.

Q: Which substitute offers the best supply availability?

A: ERJ-1GNF4302C (Panasonic) provides the highest inventory level at 550,834 units. This part is a ±1% upgrade option with -55°C ~ 125°C operating range. For applications requiring the full 155°C temperature range, ERJ-1GNJ433C offers strong availability at 78,462 units as a direct equivalent.

Q: Is the 0201 package size consistent across all substitutes?

A: Yes. All listed substitute parts use the 0201 (0603 Metric) package format with identical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm) and maximum seated height of 0.010" (0.26mm). Package compatibility is guaranteed across all substitutes.

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