RK73H1HTTC8450F Equivalent & Substitute Parts

Part Overview

The RK73H1HTTC8450F is a 845 Ohm ±1% 0.05W (1/20W) chip resistor in 0201 package (0603 Metric) manufactured by KOA Speer Electronics, Inc. This component features automotive AEC-Q200 qualification and moisture-resistant thick film construction, designed for high-reliability applications in automotive and industrial environments.

The main part carries a "Not For New Designs" product status, indicating it has been superseded. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support ongoing production of systems utilizing this component specification.

Substiute Parts

RK73H1HTTC8450F

KOA Speer Electronics, Inc.In Stock: 20952RK73H1HTTC8450F Datasheet

Current PartRFQ

RK73H1HTTCM8450F

KOA Speer Electronics, Inc.In Stock: 808RK73H1HTTCM8450F Datasheet

MFR RecommendedRFQ

AC0201FR-07845RL

YAGEOIn Stock: 1016AC0201FR-07845RL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73H1HTTC8450F is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 845 Ohms
• Tolerance: ±1%
• Power rating: 0.05W (1/20W)
• Package: 0201 (0603 Metric)
• Composition: Thick Film
• Temperature coefficient: ±200ppm/°C
• Operating temperature range: -55°C ~ 155°C
• Automotive qualification: AEC-Q200
• Moisture resistance: Required
• RoHS compliance: ROHS3
• Moisture sensitivity level: MSL 1

All identified substitute parts meet these parameters without exception. Substitutes are grouped into two categories:

Category 1: Manufacturer-Recommended Equivalent – Direct replacement from the same manufacturer with identical electrical and mechanical specifications but active product status.

Category 2: Cross-Manufacturer Direct Substitute – Functionally equivalent part from alternative manufacturer meeting all electrical, mechanical, and compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

For Active Production and New Designs:

The RK73H1HTTCM8450F (KOA Speer Electronics, Inc.) is the primary recommended substitute. This part carries Active product status and represents the direct successor to the RK73H1HTTC8450F within the same manufacturer's product line. It maintains identical electrical specifications, mechanical dimensions, and AEC-Q200 automotive qualification. Selection of this part ensures supply chain continuity with the original manufacturer and eliminates obsolescence risk.

For Cross-Manufacturer Flexibility:

The AC0201FR-07845RL (YAGEO) provides an alternative source for the 845 Ohm 0201 resistor specification. This part is Active, meets all electrical and mechanical requirements, carries AEC-Q200 qualification, and maintains ROHS3 compliance. The AC series from YAGEO is established in automotive applications and provides supply diversification without compromising performance or reliability.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with automotive assembly processes and long-term storage requirements. AEC-Q200 qualification is preserved across all options, supporting use in automotive-grade applications.

Frequently Asked Questions (FAQ)

Q: Can RK73H1HTTCM8450F directly replace RK73H1HTTC8450F in existing designs?

A: Yes. The RK73H1HTTCM8450F is electrically and mechanically identical to the RK73H1HTTC8450F. Both parts share the same resistance value (845 Ohms), tolerance (±1%), power rating (0.05W), package (0201), temperature coefficient (±200ppm/°C), operating range (-55°C ~ 155°C), and AEC-Q200 qualification. Pin-for-pin and footprint compatibility is complete.

Q: What is the difference between RK73H1HTTC8450F and RK73H1HTTCM8450F?

A: The primary difference is product status. RK73H1HTTC8450F is marked "Not For New Designs," indicating end-of-life status. RK73H1HTTCM8450F carries Active status and represents the current production equivalent. All electrical and mechanical specifications are identical.

Q: Can YAGEO AC0201FR-07845RL be used as a substitute in automotive applications?

A: Yes. The AC0201FR-07845RL meets all requirements for automotive use, including AEC-Q200 qualification, moisture resistance, ROHS3 compliance, and MSL 1 rating. It is electrically and mechanically equivalent to the RK73H1HTTC8450F across all critical parameters.

Q: Are there any package or footprint differences between these parts?

A: No. All three parts use the 0201 (0603 Metric) package with identical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm) and maximum seated height of 0.010" (0.26mm). PCB footprints are interchangeable.

Q: What is the significance of AEC-Q200 qualification for these resistors?

A: AEC-Q200 is the automotive industry standard qualification for passive components. It certifies that the part meets stringent reliability, temperature cycling, and performance requirements for automotive applications. All substitute parts carry this qualification, ensuring suitability for automotive-grade designs.

Q: Does moisture resistance affect substitution eligibility?

A: Moisture resistance is a specified feature of the RK73H1HTTC8450F. Both substitute parts (RK73H1HTTCM8450F and AC0201FR-07845RL) maintain this feature, ensuring equivalent performance in moisture-sensitive environments. MSL 1 (Unlimited) rating is consistent across all parts.

Q: What does "Not For New Designs" status mean for the main part?

A: This designation indicates that the RK73H1HTTC8450F has been superseded and is no longer recommended for new product development. Existing inventory may remain available, but new designs should specify the active equivalent (RK73H1HTTCM8450F) or approved cross-manufacturer substitute (AC0201FR-07845RL).