Resistors-Chassis Mount

Part Number	Description / PDF	Quantity
L25J3K0 Ohmite	RES CHAS MNT 3K OHM 5% 25W	0
504BA103KDG2 Ohmite	20W 1800J 10K OHMS 10% SLAB	0
L100J10K Ohmite	RES CHAS MNT 10K OHM 5% 100W	11
F30J25RE Ohmite	RES CHAS MNT 25 OHM 5% 30W	25
HS100 1R5 F Ohmite	RES CHAS MNT 1.5 OHM 1% 100W	0
HS25 75R F Ohmite	RES CHAS MNT 75 OHM 1% 25W	0
HS100 27R F Ohmite	RES CHAS MNT 27 OHM 1% 100W	0
HS25 R50 F Ohmite	RES CHAS MNT 0.5 OHM 1% 25W	0
HS300 27R F Ohmite	RES CHAS MNT 27 OHM 1% 300W	0
TGHDX27R0JE Ohmite	100W SOT227 27 OHMS 5%	0
HS100 47R F Ohmite	RES CHAS MNT 47 OHM 1% 100W	0
HS75 220R J Ohmite	RES CHAS MNT 220 OHM 5% 75W	0
850F75RE Ohmite	RES CHAS MNT 75 OHM 1% 50W	23
HS50 R30 F Ohmite	RES CHAS MNT 0.3 OHM 1% 50W	0
TA2K0PH100RKE Ohmite	RES CHAS MNT 100 OHM 10% 2000W	0
HS100 68R J Ohmite	RES CHAS MNT 68 OHM 5% 100W	0
HS250 4R7 F Ohmite	RES CHAS MNT 4.7 OHM 1% 250W	0
HS100 8R F Ohmite	RES CHAS MNT 8 OHM 1% 100W	0
HS300 100R J Ohmite	RES CHAS MNT 100 OHM 5% 300W	12
504BA702KDG2 Ohmite	20W 1800J 7K OHMS 10% SLAB	10

Resistors-Chassis Mount

1. Overview

Chassis Mount Resistors are specialized electronic components designed for direct mounting onto equipment chassis or heat sinks. They provide critical functions including current limiting, voltage division, and energy dissipation in high-power applications. Their importance in modern technology lies in enabling thermal management stability and electrical performance in industrial, automotive, and power electronics systems.

2. Major Types and Functional Classification

Type	Functional Features	Application Examples
Wirewound Chassis Mount	High precision, pulse stability, 10-100W power rating	Industrial motor drives, test equipment
Film Type Chassis Mount	Low noise, fast response, 5-50W rating	Communication infrastructure, medical devices
Ceramic Composite Mount	High-temperature resistance, 50-300W rating	EV charging systems, renewable energy inverters

3. Structure and Composition

Typical construction includes:

Aluminum alloy heat-dissipating housing (surface-anodized for insulation)
High-purity ceramic substrate with resistive element (NiCr or TaN)
Multi-layer silicone coating for vibration resistance
Brass/copper alloy mounting terminals (anti-corrosion plated)

Thermal interface materials (TIM) ensure efficient heat transfer to chassis.

4. Key Technical Specifications

Parameter	Importance	Typical Range
Rated Power	Determines thermal handling capacity	5-500W
Resistance Range	Affects current regulation precision	0.1 -100k
Tolerance	Impacts circuit accuracy	0.5% to 5%
Temperature Coefficient	Stability over operating temperature	50-200ppm/ C
Dielectric Strength	Safety insulation performance	1.5-5kV

5. Application Fields

Primary industries include:

Industrial automation (variable frequency drives, PLCs)
Renewable energy (solar inverters, wind turbine converters)
Transportation (EV on-board chargers, railway traction systems)
Telecommunications (base station power amplifiers, data center PSUs)

Case Study: 300W ceramic composite resistors in EV fast chargers enable 15-minute battery charging cycles.

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Vishay Precision Group	CPW-100	100W wirewound, 0.1% tolerance
Ohmite Manufacturing	270 series	500W ceramic housing, IP65 rated
Panasonic Electronic	ERJ-P11	Thin-film technology, 100ppm/ C stability

7. Selection Guidelines

Key considerations:

Calculate required power derating (70% of max rating recommended)
Match resistance value with system voltage/current requirements
Evaluate thermal interface compatibility with chassis
Consider environmental factors (humidity, vibration, ambient temperature)
Budget allocation: High-reliability models may cost 2-3 standard versions

8. Industry Trends Analysis

Current development trends include:

Nano-ceramic materials enabling 40% smaller form factors
Integrated temperature sensing resistors for smart power systems
Graphene-enhanced thermal coatings improving heat dissipation by 25%
Automotive-grade models supporting 150 C operating temperatures
Industry 4.0 compatibility with IoT-enabled resistance monitoring

Market projections indicate 8.7% CAGR through 2030 driven by EV and 5G infrastructure demands.