RK73B1HTTC122G Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC122G is a 1.2 kOhms ±2% thick film chip resistor in 0201 package (0603 Metric) rated for 0.05W power dissipation. This component is designed for automotive applications and carries AEC-Q200 qualification. The part is currently classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent substitute parts is necessary for ongoing support of legacy systems and for applications where continued supply of the original part number cannot be guaranteed.

Substiute Parts

RK73B1HTTC122G

KOA Speer Electronics, Inc.In Stock: 1049RK73B1HTTC122G Datasheet

Current PartRFQ

RK73B1HTTCM122G

KOA Speer Electronics, Inc.In Stock: 770RK73B1HTTCM122G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73B1HTTC122G is determined by strict equivalence across the following critical parameters:

• Resistance Value: 1.2 kOhms (exact match required)
• Tolerance: ±2% (exact match required)
• 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 (exact match required)
• Automotive Qualification: AEC-Q200 (exact match required)
• Compliance: ROHS3 Compliant, MSL 1 (exact match required)

Substitute parts must satisfy all parameters listed above without exception. Parts differing in any of these specifications are not electrically or mechanically interchangeable and do not qualify as substitutes.

Parameter Comparison

Engineering Selection Recommendations

The RK73B1HTTCM122G is the direct substitute for RK73B1HTTC122G. Both parts are manufactured by KOA Speer Electronics, Inc., belong to the RK73B series, and are electrically and mechanically identical across all specified parameters. The primary distinction is product status: the original part is classified as "Not For New Designs," while the substitute is Active, indicating current manufacturing and availability.

For applications currently using RK73B1HTTC122G, transition to RK73B1HTTCM122G is supported by:

• Identical electrical specifications (1.2 kOhms ±2%, 0.05W, ±200ppm/°C)
• Identical mechanical form factor (0201 package, 0.60mm x 0.30mm)
• Identical automotive qualification (AEC-Q200)
• Identical compliance certifications (ROHS3, MSL 1, REACH Unaffected)
• Active product status ensuring continued supply and manufacturing consistency

No design modifications, PCB layout changes, or thermal analysis revisions are required when substituting RK73B1HTTCM122G for RK73B1HTTC122G.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM122G be used as a direct replacement for RK73B1HTTC122G?

A: Yes. Both parts are electrically and mechanically identical. All electrical parameters (resistance, tolerance, power rating, temperature coefficient, operating temperature range) and mechanical specifications (package, dimensions, height) are identical. Both carry AEC-Q200 automotive qualification and ROHS3 compliance.

Q: What is the difference between these two part numbers?

A: The primary difference is product status. RK73B1HTTC122G is classified as "Not For New Designs," indicating it has been superseded. RK73B1HTTCM122G is Active, representing the current production equivalent. The "M" designation in the part number reflects this status change within the KOA Speer RK73B series.

Q: Are there any compatibility concerns when switching from RK73B1HTTC122G to RK73B1HTTCM122G?

A: No compatibility concerns exist. The parts are pin-compatible, footprint-compatible, and functionally equivalent. No PCB modifications, requalification, or design changes are necessary.

Q: Will RK73B1HTTCM122G perform identically in automotive applications?

A: Yes. Both parts meet AEC-Q200 automotive qualification standards and operate across the identical temperature range (-55°C ~ 155°C). Electrical performance, reliability, and thermal characteristics are equivalent.

Q: What is the inventory status of these parts?

A: RK73B1HTTC122G has 945 pieces in stock (legacy inventory). RK73B1HTTCM122G has 708 pieces in stock and represents the active production part with ongoing supply availability.

Q: Are there any other substitute options for this 1.2 kOhms ±2% 0.05W 0201 resistor?

A: Substitution is limited to parts meeting all specified parameters: 1.2 kOhms resistance, ±2% tolerance, 0.05W power rating, 0201 package, thick film composition, ±200ppm/°C temperature coefficient, -55°C ~ 155°C operating range, and AEC-Q200 automotive qualification. Only RK73B1HTTCM122G meets these criteria as a direct equivalent.