RK73B1HTTC181J Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC181J is a 180 Ohm ±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by KOA Speer Electronics, Inc., this component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. The part carries AEC-Q200 automotive qualification and ROHS3 compliance. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for ongoing production requirements and design continuity.

Key Parameters

Parameter	Value
Resistance	180 Ohms
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)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RK73B1HTTC181J is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Resistance value: 180 Ohms (exact match required)
Tolerance: ±5% (minimum acceptable tolerance)
Power rating: 0.05W / 1/20W (exact match required)
Package: 0201 (0603 Metric) (exact match required)
Composition: Thick Film (exact match required)
Temperature Coefficient: ±200ppm/°C (exact match required)
Operating Temperature Range: -55°C ~ 155°C (minimum acceptable range)
RoHS Status: ROHS3 Compliant (required)
Moisture Sensitivity Level: 1 (Unlimited) (required)

Substitute Categories:

Direct Equivalents (±5% Tolerance): Parts maintaining identical electrical specifications and tolerance. These include RK73B1HTTCM181J (KOA Speer Electronics, Inc.), AC0201JR-07180RL (YAGEO), CRCW0201180RJNED (Vishay Dale), ERJ-1GNJ181C (Panasonic Electronic Components), and RC0201JR-07180RL (YAGEO).

Upgrade Options (±1% Tolerance): Parts with tighter tolerance specifications (±1%) while maintaining all other electrical and mechanical parameters. These include CRCW0201180RFKED (Vishay Dale), CRCW0201180RFNED (Vishay Dale), ERJ-1GEF1800C (Panasonic Electronic Components), ERJ-1GNF1800C (Panasonic Electronic Components), and RMCF0201FT180R (Stackpole Electronics Inc).

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Product Status	AEC-Q200
RK73B1HTTC181J	KOA Speer Electronics, Inc.	180 Ω	±5%	0.05	±200	-55 ~ 155	Not For New Designs	Yes
RK73B1HTTCM181J	KOA Speer Electronics, Inc.	180 Ω	±5%	0.05	±200	-55 ~ 155	Active	Yes
AC0201JR-07180RL	YAGEO	180 Ω	±5%	0.05	±200	-55 ~ 155	Active	Yes
CRCW0201180RJNED	Vishay Dale	180 Ω	±5%	0.05	±200	-55 ~ 155	Active	No
ERJ-1GNJ181C	Panasonic Electronic Components	180 Ω	±5%	0.05	±200	-55 ~ 125	Active	No
RC0201JR-07180RL	YAGEO	180 Ω	±5%	0.05	±200	-55 ~ 125	Active	No
CRCW0201180RFKED	Vishay Dale	180 Ω	±1%	0.05	±100	-55 ~ 155	Active	No
CRCW0201180RFNED	Vishay Dale	180 Ω	±1%	0.05	±200	-55 ~ 155	Active	No
ERJ-1GEF1800C	Panasonic Electronic Components	180 Ω	±1%	0.05	±200	-55 ~ 125	Obsolete	No
ERJ-1GNF1800C	Panasonic Electronic Components	180 Ω	±1%	0.05	±200	-55 ~ 125	Active	No
RMCF0201FT180R	Stackpole Electronics Inc	180 Ω	±1%	0.05	±200	-55 ~ 155	Active	Yes

Engineering Selection Recommendations

For Direct Replacement (±5% Tolerance Requirement):

RK73B1HTTCM181J from KOA Speer Electronics, Inc. is the primary recommended substitute. This part maintains identical electrical specifications to the original RK73B1HTTC181J while carrying Active product status. Both parts are AEC-Q200 qualified and ROHS3 compliant with matching operating temperature ranges (-55°C ~ 155°C).

AC0201JR-07180RL from YAGEO is an alternative direct equivalent with Active status and AEC-Q200 qualification. This part includes moisture-resistant thick film construction and maintains the full -55°C ~ 155°C operating temperature range.

For Applications Requiring Tighter Tolerance (±1% Tolerance):

RMCF0201FT180R from Stackpole Electronics Inc is recommended for applications requiring improved tolerance performance. This part maintains AEC-Q200 qualification and the full -55°C ~ 155°C operating temperature range while providing ±1% tolerance and Active product status.

CRCW0201180RFNED from Vishay Dale offers ±1% tolerance with Active status and extended temperature range (-55°C ~ 155°C). This part maintains ±200ppm/°C temperature coefficient matching the original specification.

ERJ-1GNF1800C from Panasonic Electronic Components provides ±1% tolerance with Active status. Note that this part has a reduced operating temperature range (-55°C ~ 125°C) compared to the original specification.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited). Parts with AEC-Q200 qualification (RK73B1HTTCM181J, AC0201JR-07180RL, RMCF0201FT180R) are preferred for automotive applications requiring explicit qualification documentation.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM181J be used as a direct replacement for RK73B1HTTC181J?

A: Yes. RK73B1HTTCM181J is the direct equivalent from KOA Speer Electronics, Inc. Both parts share identical electrical specifications (180 Ohms ±5%, 0.05W), package format (0201), composition (thick film), temperature coefficient (±200ppm/°C), and operating temperature range (-55°C ~ 155°C). The primary difference is product status: RK73B1HTTCM181J is Active while RK73B1HTTC181J is Not For New Designs.

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

A: Direct equivalents maintain the ±5% tolerance specification of the original RK73B1HTTC181J. Upgrade options provide tighter ±1% tolerance while maintaining all other electrical and mechanical parameters. Upgrade parts are suitable for applications requiring improved accuracy without changing the physical footprint or package format.

Q: Are all substitute parts compatible with the 0201 package footprint?

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 (0.010" / 0.26mm). Physical compatibility with existing PCB layouts is maintained across all substitutes.

Q: Which substitute parts maintain AEC-Q200 automotive qualification?

A: RK73B1HTTCM181J, AC0201JR-07180RL, and RMCF0201FT180R carry explicit AEC-Q200 qualification. These parts are preferred for automotive applications requiring documented qualification compliance.

Q: What is the operating temperature range limitation for Panasonic parts?

A: ERJ-1GNJ181C, ERJ-1GEF1800C, and ERJ-1GNF1800C from Panasonic Electronic Components have a reduced operating temperature range of -55°C ~ 125°C compared to the original RK73B1HTTC181J specification of -55°C ~ 155°C. These parts are suitable for applications operating within the -55°C ~ 125°C range but not for applications requiring the full 155°C upper limit.

Q: Can ±1% tolerance parts be used in applications designed for ±5% tolerance?

A: Yes. Upgrade parts with ±1% tolerance can be used in applications designed for ±5% tolerance. The tighter tolerance provides improved accuracy and is backward compatible with designs specifying ±5% tolerance. No circuit redesign is required.

Q: What is the significance of Moisture Sensitivity Level 1?

A: Moisture Sensitivity Level 1 (Unlimited) indicates the component has no moisture sensitivity limitations. The part does not require special moisture control during storage, handling, or assembly. All listed substitute parts maintain this MSL 1 rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the environmental compliance status of the original RK73B1HTTC181J.

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