9T04021A49R9DAHF3 Equivalent & Substitute Parts

Part Overview

The 9T04021A49R9DAHF3 is a 49.9 Ohm ±0.5% thin film chip resistor in 0402 (1005 Metric) package rated at 0.063W (1/16W). Manufactured by YAGEO under the RT series, this component is classified as obsolete. Due to its obsolete status and limited availability (685 pcs in stock), identifying equivalent and substitute parts is necessary for ongoing production support and design continuity.

Substiute Parts

9T04021A49R9DAHF3

YAGEOIn Stock: 6989T04021A49R9DAHF3 Datasheet

Current PartRFQ

RT0402DRD0749R9L

YAGEOIn Stock: 15835RT0402DRD0749R9L Datasheet

DirectRFQ

RR0510R-49R9-D

SusumuIn Stock: 1854RR0510R-49R9-D Datasheet

DirectRFQ

TNPW040249R9BETD

Vishay DaleIn Stock: 2422TNPW040249R9BETD Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 9T04021A49R9DAHF3 is determined by the following critical parameters: resistance value (49.9 Ohms), tolerance (±0.5% or better), power rating (0.063W minimum), package type (0402), and composition (thin film). All identified substitutes maintain these core electrical and mechanical specifications, ensuring functional compatibility in the original application circuit.

The substitute parts are categorized as follows:

Direct Substitutes maintain identical or equivalent specifications across all critical parameters. These parts can replace the main part without circuit redesign.

Upgrade Substitute offers enhanced performance characteristics (tighter tolerance) while maintaining all critical electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

RT0402DRD0749R9L (YAGEO) is the primary direct substitute. This part maintains identical electrical specifications and operating temperature range while offering improved temperature coefficient performance (±25ppm/°C vs ±100ppm/°C). It is ROHS3 compliant and actively manufactured with substantial inventory availability (15823 pcs).

RR0510R-49R9-D (Susumu) serves as an alternative direct substitute with equivalent electrical performance. This part is ROHS3 compliant and actively produced. The operating temperature range is reduced to -55°C ~ 125°C, and maximum seated height is 0.016" (0.40mm) compared to 0.014" (0.35mm) for the main part. This height difference must be evaluated for PCB layout compatibility.

TNPW040249R9BETD (Vishay Dale) is classified as an upgrade substitute due to superior tolerance specification (±0.1% vs ±0.5%). This military-grade thin film resistor maintains all critical electrical and mechanical parameters. Operating temperature range is -55°C ~ 125°C. RoHS compliance status differs from the main part. This option is suitable for applications requiring tighter tolerance control.

Frequently Asked Questions (FAQ)

Q: Can RT0402DRD0749R9L directly replace 9T04021A49R9DAHF3 in production?

A: Yes. Both parts share identical resistance (49.9 Ohms), tolerance (±0.5%), power rating (0.063W), package (0402), and operating temperature range (-55°C ~ 155°C). RT0402DRD0749R9L offers superior temperature coefficient performance and is actively manufactured with higher inventory levels.

Q: What is the impact of the height difference between RR0510R-49R9-D and the main part?

A: RR0510R-49R9-D has a maximum seated height of 0.016" (0.40mm) compared to 0.014" (0.35mm) for 9T04021A49R9DAHF3. This 0.002" (0.05mm) difference must be verified against PCB design constraints, solder reflow profiles, and component placement tolerances before implementation.

Q: Is TNPW040249R9BETD suitable for standard applications?

A: TNPW040249R9BETD is functionally compatible as a substitute. The ±0.1% tolerance provides enhanced precision compared to the ±0.5% specification of the main part. Operating temperature range is -55°C ~ 125°C. Verify RoHS compliance requirements for your application, as this part has a different RoHS status than the main component.

Q: What is the primary reason to transition from 9T04021A49R9DAHF3?

A: The main part is classified as obsolete. While current inventory exists (685 pcs), long-term production support and component availability are not guaranteed. Active substitutes ensure supply chain continuity and compliance with current manufacturing standards.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. RT0402DRD0749R9L, RR0510R-49R9-D, and TNPW040249R9BETD are all supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.