ERJ-S1TJ301U Equivalent & Substitute Parts

Part Overview

The ERJ-S1TJ301U is a 300 Ohms ±5% 1W thick film chip resistor in 2512 (6432 Metric) package manufactured by Panasonic Electronic Components. This part features anti-sulfur coating and automotive AEC-Q200 qualification, designed for high-reliability applications in harsh environments. The product is currently active and widely available. Equivalent and substitute parts are necessary when the primary part experiences supply constraints, when design requirements allow for alternative manufacturers, or when enhanced performance characteristics such as higher power ratings are beneficial.

Key Parameters

Parameter	Value
Resistance	300 Ohms
Tolerance	±5%
Power Rating	1W
Package / Case	2512 (6432 Metric)
Composition	Thick Film
Temperature Coefficient	±200ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Automotive Rating	AEC-Q200
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ERJ-S1TJ301U is determined by the following critical parameters: resistance value (300 Ohms), tolerance (±5%), package type (2512), composition (thick film), temperature coefficient (±200ppm/°C), operating temperature range (-55°C ~ 155°C), and compliance certifications (ROHS3, AEC-Q200). All listed substitute parts meet these core electrical and mechanical requirements. The primary distinction among substitutes is power rating and specific feature sets. Parts with 1W power rating provide direct functional equivalence. The CRCW2512300RJNEGHP variant offers enhanced 1.5W power capability with pulse withstanding characteristics, suitable for applications requiring additional thermal margin. Product status variations (Active versus Not For New Designs) indicate design lifecycle positioning but do not affect electrical compatibility.

Parameter Comparison

Parameter	ERJ-S1TJ301U (Main)	ERJ-1TYJ301U	CR2512-JW-301ELF	CRCW2512300RJNEG	CRCW2512300RJNEGHP	RMCF2512JT300R
Manufacturer	Panasonic	Panasonic	Bourns Inc.	Vishay Dale	Vishay Dale	Stackpole Electronics
Resistance	300 Ohms	300 Ohms	300 Ohms	300 Ohms	300 Ohms	300 Ohms
Tolerance	±5%	±5%	±5%	±5%	±5%	±5%
Power Rating	1W	1W	1W	1W	1.5W	1W
Package / Case	2512	2512	2512	2512	2512	2512
Composition	Thick Film	Thick Film	Thick Film	Thick Film	Thick Film	Thick Film
Temperature Coefficient	±200ppm/°C	±200ppm/°C	±200ppm/°C	±200ppm/°C	±200ppm/°C	±200ppm/°C
Operating Temperature	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C
AEC-Q200 Rating	Yes	Yes	No	Yes	Yes	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Not For New Designs	Active	Active	Active	Active

Engineering Selection Recommendations

For new designs, select from parts with Active product status: CR2512-JW-301ELF (Bourns), CRCW2512300RJNEG (Vishay Dale), CRCW2512300RJNEGHP (Vishay Dale), or RMCF2512JT300R (Stackpole Electronics). All five substitute parts maintain ROHS3 compliance and operate within the specified temperature range.

For automotive applications requiring AEC-Q200 certification, use ERJ-1TYJ301U, CRCW2512300RJNEG, CRCW2512300RJNEGHP, or RMCF2512JT300R. The CR2512-JW-301ELF from Bourns does not carry AEC-Q200 qualification and is suitable only for non-automotive applications.

When thermal margin is critical, the CRCW2512300RJNEGHP offers 1.5W power rating with pulse withstanding capability, providing enhanced reliability in high-stress environments compared to standard 1W alternatives.

The ERJ-1TYJ301U, while electrically equivalent and AEC-Q200 qualified, carries a Not For New Designs status and should be reserved for legacy system maintenance or replacement scenarios only.

Frequently Asked Questions (FAQ)

Q: Can I substitute the ERJ-S1TJ301U with any of the listed parts in automotive applications?

A: Only if the substitute carries AEC-Q200 certification. The CR2512-JW-301ELF does not meet this requirement. Suitable automotive substitutes are ERJ-1TYJ301U, CRCW2512300RJNEG, CRCW2512300RJNEGHP, and RMCF2512JT300R.

Q: What is the difference between CRCW2512300RJNEG and CRCW2512300RJNEGHP?

A: Both are Vishay Dale parts with identical electrical characteristics except power rating. The standard CRCW2512300RJNEG is rated at 1W, while the CRCW2512300RJNEGHP is rated at 1.5W and includes pulse withstanding capability for enhanced transient protection.

Q: Is the ERJ-1TYJ301U still suitable for new designs?

A: No. The ERJ-1TYJ301U carries a Not For New Designs status. Use this part only for replacement or maintenance of existing systems. For new designs, select from active status alternatives.

Q: Are all substitute parts in the same 2512 package?

A: Yes. All listed parts use the 2512 (6432 Metric) package. Physical dimensions vary slightly between manufacturers (length 6.30mm to 6.40mm, width 3.10mm to 3.20mm, height 0.70mm to 0.75mm), but all are compatible with standard 2512 footprints.

Q: Do all parts meet RoHS3 compliance?

A: Yes. All listed parts, including the main part ERJ-S1TJ301U and all substitutes, are ROHS3 compliant.

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