Equivalent & Substitute Parts for TWM3J300

Part Overview

The TWM3J300 is a 300 Ohms ±5% 3W through-hole resistor with radial leads, manufactured by Ohmite using metal oxide film composition. This component features flame-proof and safety characteristics suitable for industrial and high-reliability applications. The TWM3J300 is classified as obsolete, making identification of active equivalent parts essential for ongoing procurement and design continuity.

Key Parameters

Parameter	Value
Resistance	300 Ohms
Tolerance	±5%
Power Rating	3W
Composition	Metal Oxide Film
Package Type	Radial
Operating Temperature Range	-55°C to 275°C
Temperature Coefficient	±350ppm/°C
Physical Dimensions	0.492" L x 0.354" W (12.50mm x 9.00mm)
Height - Seated (Max)	1.024" (26.00mm)
Terminations	2

Substitute Part Grouping Explanation

Substitution of the obsolete TWM3J300 is determined by strict equivalence across the following critical parameters:

Resistance value: 300 Ohms
Tolerance: ±5%
Power rating: 3W
Composition: Metal Oxide Film
Package configuration: Radial with 2 terminations
Physical dimensions: 0.492" L x 0.354" W, height 1.024" maximum
Operating temperature range: -55°C to 275°C
Temperature coefficient: ±350ppm/°C

The TWM3J300E meets all these criteria and is classified as an active product, providing direct functional and mechanical compatibility.

Parameter Comparison

Parameter	TWM3J300 (Obsolete)	TWM3J300E (Active)
Manufacturer	Ohmite	Ohmite
Resistance	300 Ohms	300 Ohms
Tolerance	±5%	±5%
Power Rating	3W	3W
Composition	Metal Oxide Film	Metal Oxide Film
Features	Flame Proof, Safety	Flame Proof, Safety
Temperature Coefficient	±350ppm/°C	±350ppm/°C
Operating Temperature	-55°C to 275°C	-55°C to 275°C
Package Type	Radial	Radial
Dimensions	0.492" L x 0.354" W (12.50mm x 9.00mm)	0.492" L x 0.354" W (12.50mm x 9.00mm)
Height - Seated (Max)	1.024" (26.00mm)	1.024" (26.00mm)
Terminations	2	2
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The TWM3J300E is the direct active equivalent for the obsolete TWM3J300. Both components share identical electrical specifications, physical dimensions, and thermal characteristics. The primary distinction is product status and regulatory compliance: the TWM3J300E is actively manufactured and ROHS3 compliant, whereas the TWM3J300 is obsolete and RoHS non-compliant.

For new designs or component replacement in existing systems, the TWM3J300E provides full functional and mechanical compatibility with improved regulatory standing. Both components maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can TWM3J300E be used as a direct replacement for TWM3J300?

A: Yes. The TWM3J300E is electrically and mechanically identical to the TWM3J300. Both components have 300 Ohms resistance, ±5% tolerance, 3W power rating, metal oxide film composition, and identical physical dimensions and radial package configuration.

Q: What is the difference between TWM3J300 and TWM3J300E?

A: The TWM3J300 is obsolete, while the TWM3J300E is an active product. The TWM3J300E is ROHS3 compliant, whereas the TWM3J300 is RoHS non-compliant. All electrical and mechanical parameters are identical.

Q: Are there any dimensional differences between these parts?

A: No. Both components have identical dimensions: 0.492" L x 0.354" W (12.50mm x 9.00mm) with a maximum seated height of 1.024" (26.00mm).

Q: What is the operating temperature range for these resistors?

A: Both the TWM3J300 and TWM3J300E operate across -55°C to 275°C with a temperature coefficient of ±350ppm/°C.

Q: Are these components suitable for high-reliability applications?

A: Yes. Both components feature flame-proof and safety characteristics, making them suitable for industrial and high-reliability applications requiring metal oxide film resistors with extended temperature ranges.

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