Equivalent & Substitute Parts for RT0402FRE0721KL

Part Overview

The RT0402FRE0721KL is a 21 kOhms ±1% thin film chip resistor in 0402 (1005 Metric) package manufactured by YAGEO. This surface-mount device is rated for 0.063W (1/16W) power dissipation with an operating temperature range of -55°C to 155°C. The part is ROHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating. As an active product with 673 units in stock, substitute parts are identified for applications requiring improved tolerance specifications, automotive-grade certifications, or alternative manufacturer sourcing.

Key Parameters

Parameter	Value
Resistance	21 kOhms
Tolerance	±1%
Power Rating	0.063W (1/16W)
Package	0402 (1005 Metric)
Composition	Thin Film
Operating Temperature	-55°C to 155°C
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by three core parameters: resistance value (21 kOhms), package type (0402), and thin film composition. All identified substitutes maintain these specifications. Tolerance, temperature coefficient, and operating temperature range variations define substitution categories:

Tolerance-Based Grouping:

±1% tolerance (original specification): RT0402FRE0721KL
±0.1% tolerance (improved accuracy): RT0402BRD0721KL, RT0402BRE0721KL, CPF0402B21KE1, ERA-2AEB2102X, RG1005P-2102-B-T5
±0.5% tolerance (intermediate accuracy): RT0402DRD0721KL, RT0402DRE0721KL, RR0510P-2102-D

Certification-Based Grouping:

Standard industrial: YAGEO RT series, Susumu RR series
Automotive AEC-Q200: ERA-2AEB2102X (Panasonic), RG1005P-2102-B-T5 (Susumu with anti-sulfur feature)

All substitutes are 0402 package, thin film composition, and ROHS3 compliant with MSL 1 rating.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power	Temp Coeff	Op Temp Range	Package	Certifications	Inventory
RT0402FRE0721KL	YAGEO	21 kOhms	±1%	0.063W	±50ppm/°C	-55°C to 155°C	0402	ROHS3	673
RT0402BRD0721KL	YAGEO	21 kOhms	±0.1%	0.063W	±25ppm/°C	-55°C to 155°C	0402	ROHS3	16505
RT0402BRE0721KL	YAGEO	21 kOhms	±0.1%	0.063W	±50ppm/°C	-55°C to 155°C	0402	ROHS3	9933
RT0402DRD0721KL	YAGEO	21 kOhms	±0.5%	0.063W	±25ppm/°C	-55°C to 155°C	0402	ROHS3	27079
RT0402DRE0721KL	YAGEO	21 kOhms	±0.5%	0.063W	±50ppm/°C	-55°C to 155°C	0402	ROHS3	5369
CPF0402B21KE1	TE Connectivity	21 kOhms	±0.1%	0.063W	±25ppm/°C	-55°C to 155°C	0402	ROHS3	2172
ERA-2AEB2102X	Panasonic	21 kOhms	±0.1%	0.063W	±25ppm/°C	-55°C to 155°C	0402	ROHS3, AEC-Q200	5213
RG1005P-2102-B-T5	Susumu	21 kOhms	±0.1%	0.063W	±25ppm/°C	-55°C to 155°C	0402	ROHS3, AEC-Q200	82538
RR0510P-2102-D	Susumu	21 kOhms	±0.5%	0.063W	±25ppm/°C	-55°C to 125°C	0402	ROHS3	10798

Engineering Selection Recommendations

For Direct Replacement (Same Tolerance): No direct ±1% tolerance alternatives are listed. The RT0402FRE0721KL remains the only ±1% option in this substitution set.

For Improved Tolerance (±0.1%): RT0402BRD0721KL, RT0402BRE0721KL, CPF0402B21KE1, ERA-2AEB2102X, and RG1005P-2102-B-T5 all provide ±0.1% tolerance with identical 0402 package and power rating. These are suitable where tighter tolerance specifications are required. YAGEO RT0402BRD0721KL offers the highest inventory (16505 units).

For Intermediate Tolerance (±0.5%): RT0402DRD0721KL, RT0402DRE0721KL, and RR0510P-2102-D provide ±0.5% tolerance. RT0402DRD0721KL has the largest inventory (27079 units) among this group.

For Automotive Applications: ERA-2AEB2102X (Panasonic) and RG1005P-2102-B-T5 (Susumu) carry AEC-Q200 certification. RG1005P-2102-B-T5 includes anti-sulfur feature and has the highest inventory (82538 units) across all substitutes.

Temperature Coefficient Consideration: Parts with ±25ppm/°C (RT0402BRD0721KL, RT0402DRD0721KL, CPF0402B21KE1, ERA-2AEB2102X, RG1005P-2102-B-T5, RR0510P-2102-D) provide better temperature stability than the original ±50ppm/°C specification.

Operating Temperature Limitation: RR0510P-2102-D has a reduced upper operating temperature limit of 125°C compared to 155°C for all other parts.

Frequently Asked Questions (FAQ)

Q: Can I use a ±0.1% tolerance part as a direct substitute for the ±1% RT0402FRE0721KL? A: Yes. A ±0.1% tolerance part meets all requirements of a ±1% specification. The tighter tolerance provides improved accuracy without affecting circuit compatibility.

Q: What is the difference between RT0402BRD0721KL and RT0402BRE0721KL? A: Both are YAGEO ±0.1% tolerance 21 kOhms 0402 resistors. The primary difference is temperature coefficient: RT0402BRD0721KL has ±25ppm/°C while RT0402BRE0721KL has ±50ppm/°C. RT0402BRD0721KL offers better temperature stability.

Q: Are automotive-grade parts (AEC-Q200) compatible with standard industrial applications? A: Yes. AEC-Q200 certified parts (ERA-2AEB2102X, RG1005P-2102-B-T5) meet or exceed industrial specifications and are fully compatible with standard applications. They provide additional reliability assurance.

Q: Why does RR0510P-2102-D have a lower maximum operating temperature? A: RR0510P-2102-D is rated to 125°C maximum, compared to 155°C for other substitutes. This part is suitable only for applications where the operating temperature does not exceed 125°C.

Q: What does "anti-sulfur" feature mean on RG1005P-2102-B-T5? A: Anti-sulfur coating protects the resistor from sulfur-containing environmental contaminants, extending reliability in harsh industrial and automotive environments. This feature is relevant for applications exposed to sulfur compounds.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance.

Q: Which substitute has the best inventory availability? A: RG1005P-2102-B-T5 (Susumu) has the highest inventory at 82538 units, followed by RT0402DRD0721KL (YAGEO) at 27079 units.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message