ERJ-S1DF21R5U Equivalent & Substitute Parts

Part Overview

The ERJ-S1DF21R5U is a 21.5 Ohm ±1% thick film chip resistor rated at 0.75W in a 2010 (5025 Metric) package. Manufactured by Panasonic Electronic Components, this part features anti-sulfur properties and automotive AEC-Q200 qualification, making it suitable for demanding automotive and industrial applications operating across -55°C to 155°C. The part is currently in active production status with 873 units in stock.

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits component sourcing from alternative manufacturers while maintaining electrical and mechanical compatibility.

Substiute Parts

ERJ-S1DF21R5U

Panasonic Electronic ComponentsIn Stock: 981ERJ-S1DF21R5U Datasheet

Current PartRFQ

ERJ-12SF21R5U

Panasonic Electronic ComponentsIn Stock: 9529ERJ-12SF21R5U Datasheet

SimilarRFQ

AC2010FK-0721R5L

YAGEOIn Stock: 4654AC2010FK-0721R5L Datasheet

SimilarRFQ

RMCF2010FT21R5

Stackpole Electronics IncIn Stock: 810RMCF2010FT21R5 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ERJ-S1DF21R5U is determined by strict equivalence across the following critical parameters:

• Resistance value: 21.5 Ohms
• Tolerance: ±1%
• Power rating: 0.75W
• Package: 2010 (5025 Metric)
• Composition: Thick Film
• Temperature coefficient: ±100ppm/°C
• Operating temperature range: -55°C to 155°C
• Automotive qualification: AEC-Q200
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity: MSL 1

All identified substitute parts meet these electrical and mechanical requirements. Differences in product status, inventory availability, and minor dimensional variations (height) do not affect functional interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All four parts listed are electrically and mechanically equivalent for circuit applications requiring a 21.5 Ohm ±1% 0.75W thick film resistor in a 2010 package with automotive qualification.

For new designs, select from the three active-status parts: ERJ-S1DF21R5U (Panasonic), AC2010FK-0721R5L (YAGEO), or RMCF2010FT21R5 (Stackpole). The ERJ-12SF21R5U carries a "Not For New Designs" status and should be used only for legacy design maintenance or when existing inventory constraints require it.

All parts maintain ROHS3 compliance, AEC-Q200 automotive qualification, and MSL 1 moisture sensitivity rating. The AC2010FK-0721R5L includes additional moisture-resistant properties and features a slightly lower maximum seated height (0.026" versus 0.028"), which may provide marginal benefits in space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can ERJ-12SF21R5U be used in new designs? A: The ERJ-12SF21R5U carries a "Not For New Designs" status. While electrically and mechanically equivalent, it should be reserved for legacy product support or when supply of active-status alternatives is unavailable.

Q: What is the difference between the Panasonic anti-sulfur feature and standard thick film? A: The ERJ-S1DF21R5U includes anti-sulfur properties as specified. This parameter is not listed for the ERJ-12SF21R5U variant. Both parts meet identical electrical specifications and AEC-Q200 automotive requirements.

Q: Are all substitute parts suitable for automotive applications? A: Yes. All four parts carry AEC-Q200 automotive qualification and operate across the -55°C to 155°C temperature range required for automotive use.

Q: Does the height difference between AC2010FK-0721R5L (0.026") and other parts (0.028") affect compatibility? A: The AC2010FK-0721R5L has a lower maximum seated height. This is compatible with all standard 2010 package footprints and may provide marginal benefits in applications with tight vertical clearance constraints.

Q: Are all parts RoHS compliant? A: Yes. All four parts are ROHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity ratings.

Q: Which part should I select for immediate availability? A: Inventory levels vary: ERJ-12SF21R5U (9448 pcs), AC2010FK-0721R5L (4641 pcs), ERJ-S1DF21R5U (873 pcs), and RMCF2010FT21R5 (728 pcs). For new designs, prioritize active-status parts with adequate stock.