Equivalent & Substitute Parts for RK73B1HTTC681J

Part Overview

The RK73B1HTTC681J is a 680 Ohms ±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 metric). This component is AEC-Q200 automotive qualified and RoHS3 compliant. The part is currently classified as "Not For New Designs," necessitating identification of equivalent and substitute components for ongoing production support and new design implementations.

Key Parameters

Parameter	Value
Resistance	680 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)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the RK73B1HTTC681J is determined by strict equivalence across the following critical parameters:

Direct Equivalence Parameters:

Resistance value: 680 Ohms
Tolerance: ±5%
Power rating: 0.05W (1/20W)
Package format: 0201 (0603 Metric)
Physical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm)
Composition: Thick Film
Temperature coefficient: ±200ppm/°C
Operating temperature range: -55°C ~ 155°C
Moisture Sensitivity Level: 1 (Unlimited)
RoHS3 compliance
REACH Unaffected status

Substitute Categories:

Direct Manufacturer Substitutes (MFR Recommended): Parts that maintain identical electrical and mechanical specifications with active product status, enabling direct replacement without design modification.

Direct Equivalent Substitutes: Parts from alternative manufacturers meeting all electrical and mechanical parameters, suitable for direct substitution in existing designs.

Upgrade Substitutes: Parts with improved tolerance (±1% vs. ±5%) while maintaining all other critical parameters, providing enhanced precision 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)
RK73B1HTTC681J	KOA Speer	680 Ω	±5%	0.05	±200	-55 ~ 155	0201	Not For New Designs	10479
RK73B1HTTCM681J	KOA Speer	680 Ω	±5%	0.05	±200	-55 ~ 155	0201	Active	945
AC0201JR-07680RL	YAGEO	680 Ω	±5%	0.05	±200	-55 ~ 155	0201	Active	791
CRCW0201680RJNED	Vishay Dale	680 Ω	±5%	0.05	±200	-55 ~ 155	0201	Active	12550
ERJ-1GNJ681C	Panasonic	680 Ω	±5%	0.05	±200	-55 ~ 125	0201	Active	39661
RC0201JR-07680RL	YAGEO	680 Ω	±5%	0.05	±200	-55 ~ 125	0201	Active	13935
CRCW0201680RFKED	Vishay Dale	680 Ω	±1%	0.05	±100	-55 ~ 155	0201	Active	8305
CRCW0201680RFNED	Vishay Dale	680 Ω	±1%	0.05	±200	-55 ~ 155	0201	Active	55780
ERJ-1GNF6800C	Panasonic	680 Ω	±1%	0.05	±200	-55 ~ 125	0201	Active	94492

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

Select from the following parts when maintaining the original ±5% tolerance specification is required:

RK73B1HTTCM681J (KOA Speer): MFR recommended substitute with active product status. Identical electrical and mechanical specifications to the original part. Lowest inventory availability among direct equivalents.
CRCW0201680RJNED (Vishay Dale): Direct equivalent with highest inventory availability (12,550 pcs) among ±5% tolerance options. Maintains all electrical parameters and operating temperature range to 155°C.
ERJ-1GNJ681C (Panasonic): Direct equivalent with highest inventory availability (39,661 pcs). Operating temperature range limited to -55°C ~ 125°C; suitable for applications not requiring the full 155°C upper limit.
AC0201JR-07680RL (YAGEO): Direct equivalent with moisture-resistant feature. Operating temperature range to 155°C. Lower inventory availability.
RC0201JR-07680RL (YAGEO): Direct equivalent with moisture-resistant feature. Operating temperature range limited to -55°C ~ 125°C.

For Enhanced Tolerance (±1% Specification):

Select from the following parts when improved tolerance performance is required:

CRCW0201680RFNED (Vishay Dale): Upgrade option with ±1% tolerance and highest inventory availability (55,780 pcs). Temperature coefficient ±200ppm/°C. Operating temperature range -55°C ~ 155°C. Direct pin-compatible replacement.
CRCW0201680RFKED (Vishay Dale): Upgrade option with ±1% tolerance and improved temperature coefficient (±100ppm/°C). Operating temperature range -55°C ~ 155°C. Lower inventory availability.
ERJ-1GNF6800C (Panasonic): Upgrade option with ±1% tolerance. Operating temperature range limited to -55°C ~ 125°C. Highest inventory availability (94,492 pcs) among all substitute options.

All substitute parts maintain RoHS3 compliance, REACH Unaffected status, MSL 1 rating, and 0201 package format. Selection should be based on application temperature requirements, tolerance specifications, and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM681J be used as a direct replacement for RK73B1HTTC681J?

A: Yes. RK73B1HTTCM681J is the MFR recommended substitute from KOA Speer Electronics with identical electrical specifications (680 Ohms ±5%, 0.05W), temperature coefficient (±200ppm/°C), operating range (-55°C ~ 155°C), and 0201 package format. The part is active and suitable for new designs.

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

A: Direct equivalent substitutes maintain the original ±5% tolerance specification. Upgrade substitutes provide improved ±1% tolerance with tighter tolerance bands, suitable for applications requiring higher precision. All other electrical and mechanical parameters remain compatible.

Q: Are there operating temperature limitations with certain substitutes?

A: Yes. ERJ-1GNJ681C and RC0201JR-07680RL have operating temperature ranges limited to -55°C ~ 125°C, compared to the original -55°C ~ 155°C range. These parts are suitable only for applications not requiring operation above 125°C. CRCW and AC/RC series from Vishay and YAGEO maintain the full -55°C ~ 155°C range.

Q: Can I use a ±1% tolerance part in place of a ±5% tolerance specification?

A: Yes. A ±1% tolerance part is a functional upgrade and can be used in any application originally specified for ±5% tolerance. The tighter tolerance provides improved precision without compromising compatibility.

Q: What is the significance of moisture-resistant features on AC0201JR-07680RL and RC0201JR-07680RL?

A: Moisture-resistant thick film composition provides enhanced reliability in humid environments. This feature is supplementary and does not affect electrical equivalence. Both parts maintain MSL 1 (Unlimited) rating, indicating no moisture sensitivity concerns for standard handling and storage.

Q: Which substitute offers the best inventory availability?

A: ERJ-1GNF6800C (Panasonic) offers the highest inventory availability at 94,492 pcs. For ±5% tolerance equivalents, ERJ-1GNJ681C provides 39,661 pcs. For ±1% tolerance upgrades with maximum availability, CRCW0201680RFNED (Vishay Dale) provides 55,780 pcs.

Q: Are all substitutes RoHS3 compliant and REACH compliant?

A: All listed substitute parts are RoHS3 compliant and REACH Unaffected. No additional compliance verification is required for substitution.

Q: What is the package compatibility across all substitutes?

A: All substitute parts use the 0201 package format (0603 metric equivalent) with identical physical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm) and maximum seated height of 0.010" (0.26mm). Full mechanical compatibility is maintained across all substitutes.

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