Equivalent & Substitute Parts for RK73B1HTTC684J

Part Overview

The RK73B1HTTC684J is a 680 kOhms ±5% thick film chip resistor in 0201 package (0.60mm x 0.30mm) rated at 0.05W (1/20W) power dissipation. Manufactured by KOA Speer Electronics, Inc., this component is designed for automotive applications and meets AEC-Q200 qualification standards. 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 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 eligibility for the RK73B1HTTC684J is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

Resistance value: 680 kOhms (exact match required)
Tolerance: ±5% (minimum acceptable; ±1% tolerance parts are upgrades)
Power rating: 0.05W / 1/20W (exact match required)
Package: 0201 (0603 Metric) (exact match required)
Physical dimensions: 0.024" L x 0.012" W; Height ≤ 0.010" (exact match required)
Composition: Thick Film (exact match required)
Number of terminations: 2 (exact match required)
RoHS3 Compliance (required for new designs)
MSL Level 1 (required)

Substitution Categories:

Direct Equivalents (680 kOhms ±5%): Parts meeting all critical parameters with identical tolerance and temperature coefficient specifications.

Upgrade Options (680 kOhms ±1%): Parts with improved tolerance (±1% vs. ±5%) and/or enhanced temperature coefficient performance. These are electrically and mechanically compatible but provide superior precision characteristics.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Product Status	Inventory (Pcs)
RK73B1HTTC684J	KOA Speer Electronics	680 kΩ	±5%	0.05	±200	-55 ~ 155	Not For New Designs	1,056
RK73B1HTTCM684J	KOA Speer Electronics	680 kΩ	±5%	0.05	±200	-55 ~ 155	Active	983
AC0201JR-07680KL	YAGEO	680 kΩ	±5%	0.05	±200	-55 ~ 155	Active	785
CRCW0201680KJNED	Vishay Dale	680 kΩ	±5%	0.05	±200	-55 ~ 155	Active	8,513
ERJ-1GNJ684C	Panasonic Electronic Components	680 kΩ	±5%	0.05	±200	-55 ~ 125	Active	74,075
CRCW0201680KFKED	Vishay Dale	680 kΩ	±1%	0.05	±100	-55 ~ 155	Active	1,058
CRCW0201680KFNED	Vishay Dale	680 kΩ	±1%	0.05	±200	-55 ~ 155	Active	68,339
ERJ-1GNF6803C	Panasonic Electronic Components	680 kΩ	±1%	0.05	±200	-55 ~ 125	Active	272,115

Engineering Selection Recommendations

For Direct Replacement (Equivalent Functionality):

Select from the following Active status parts that maintain identical electrical and mechanical specifications:

RK73B1HTTCM684J (KOA Speer Electronics): Recommended primary substitute. Same manufacturer as original part, ensuring design continuity and process compatibility. Active product status supports long-term availability.
AC0201JR-07680KL (YAGEO): Direct equivalent with moisture-resistant thick film composition. Active status and established supply chain support production continuity.
CRCW0201680KJNED (Vishay Dale): Direct equivalent with highest current inventory (8,513 pcs). Established automotive supplier with consistent quality documentation.
ERJ-1GNJ684C (Panasonic Electronic Components): Direct equivalent with largest available inventory (74,075 pcs). Note: Operating temperature upper limit is 125°C versus 155°C for other options. Verify application thermal requirements before selection.

For Enhanced Performance (Upgrade Options):

When circuit design permits tolerance improvement, the following ±1% tolerance parts provide superior precision:

CRCW0201680KFNED (Vishay Dale): ±1% tolerance with ±200ppm/°C temperature coefficient. Highest inventory among upgrade options (68,339 pcs). Operating temperature range -55°C ~ 155°C matches original specification.
ERJ-1GNF6803C (Panasonic Electronic Components): ±1% tolerance with ±200ppm/°C temperature coefficient. Largest inventory availability (272,115 pcs). Operating temperature upper limit 125°C; verify application requirements.
CRCW0201680KFKED (Vishay Dale): ±1% tolerance with enhanced ±100ppm/°C temperature coefficient. Optimal for precision-critical applications. Operating temperature range -55°C ~ 155°C.

All recommended parts are ROHS3 compliant, MSL Level 1, and suitable for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can ERJ-1GNJ684C be used in applications requiring operation above 125°C?

A: No. ERJ-1GNJ684C has a maximum operating temperature of 125°C, while the original RK73B1HTTC684J and most direct equivalents are rated to 155°C. Applications requiring the full -55°C ~ 155°C range must use RK73B1HTTCM684J, AC0201JR-07680KL, CRCW0201680KJNED, or the upgrade options CRCW0201680KFKED and CRCW0201680KFNED.

Q: What is the difference between ±5% and ±1% tolerance parts?

A: Tolerance defines the acceptable deviation from the nominal 680 kOhms resistance value. ±5% tolerance allows deviation of ±34 kOhms (646 kΩ to 714 kΩ range), while ±1% tolerance restricts deviation to ±6.8 kOhms (673.2 kΩ to 686.8 kΩ range). ±1% parts are suitable for precision analog circuits, filtering networks, and applications with tight impedance matching requirements.

Q: Are all substitute parts available in the same packaging format?

A: All listed parts are supplied in 0201 package (0603 Metric) with identical physical dimensions (0.024" L x 0.012" W; Height ≤ 0.010"). Packaging formats vary by supplier (Tape & Reel, Cut Tape, Digi-Reel®) but do not affect component compatibility or PCB assembly compatibility.

Q: Which substitute offers the best long-term supply availability?

A: ERJ-1GNF6803C (Panasonic) and CRCW0201680KFNED (Vishay Dale) demonstrate the highest inventory levels (272,115 pcs and 68,339 pcs respectively), indicating strong supply chain support. Both are Active status products from established automotive component suppliers.

Q: Can ±1% tolerance parts be used as direct replacements for ±5% tolerance applications?

A: Yes. ±1% tolerance parts are electrically and mechanically compatible with ±5% tolerance specifications. The tighter tolerance represents an upgrade that maintains backward compatibility while providing superior precision characteristics.

Q: What is the significance of Temperature Coefficient (ppm/°C) in resistor selection?

A: Temperature coefficient indicates resistance value drift per degree Celsius change. ±200ppm/°C means the resistance changes by 0.02% per °C, while ±100ppm/°C represents 0.01% per °C. Lower temperature coefficients provide better stability across the operating temperature range. For most general-purpose applications, ±200ppm/°C is acceptable; precision circuits benefit from ±100ppm/°C options.

Q: Are all substitute parts AEC-Q200 qualified?

A: The original RK73B1HTTC684J and direct equivalent AC0201JR-07680KL explicitly list AEC-Q200 qualification. Other direct equivalents (CRCW0201680KJNED, ERJ-1GNJ684C) do not explicitly state AEC-Q200 rating in provided specifications. For automotive applications requiring AEC-Q200 compliance, verify qualification status with manufacturer documentation before final selection.

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