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Ohmite
General catalog

General catalog

Product catalog summary

Overview: The document is a comprehensive technical guide from Ohmite Manufacturing Company, detailing their Component Selector 4000G, which focuses on high energy, heat sinkable, surface mount, current sense, high voltage power resistors. It includes specifications, product series, and historical context of the company.

Specifications: The document lists various resistor series, including MIL Spec Ohmite Series, with part numbers and wattage ranges. It covers different types of resistors such as wirewound, thick film, and ceramic composition, each designed for specific applications like high voltage or high energy.

Product Series: Key series include HVF Series for high voltage film flip chips, LVC Series for low value thick film chips, and various wirewound power resistors. Each series is detailed with its specific applications and technical specifications.

Company History: Ohmite has been a leader in resistive products since 1925, evolving with the electronics industry. The company expanded through acquisitions, enhancing its capabilities in wirewound and thick film technologies.

Facilities: Ohmite operates from multiple locations, including headquarters in Rolling Meadows, IL, manufacturing in Matamoros, Mexico, and Barbados, and a distribution center in Brownsville, TX.

Mission Statement: Ohmite aims to be the leading provider of resistive products for high current, high voltage, and high energy applications, focusing on customer satisfaction through quality and innovation.

Key Data: The document includes tables listing resistor series with part numbers, wattage ranges, and applications, providing a comprehensive guide for selecting the appropriate components for specific needs.

RoHS Changeover Position Statement: Ohmite Manufacturing is committed to providing both RoHS compliant and non-compliant products during the industry's transition to RoHS compliance. RoHS compliant parts are marked with an 'E' in the part number. Non-compliant parts will remain available as long as there is demand, particularly for military and aerospace customers.

Terms and Conditions of Sale:

Factory Terms: Standard payment terms are 1%, 10th and 25th, net 30 days. F.O.B. plant of manufacture, no freight allowed.
Return Policy: Written permission is required for returns.
Warranty: No warranties are expressed or implied beyond those in Ohmite policies. Product specifications and availability may change without notice.

HVF Series - High Voltage Flip Chip Film: The HVF Series offers high voltage capability up to 3,000 volts, with industry-standard sizes and a working temperature range from -55°C to 200°C. It is designed for automatic insertion and features a resistance range from 1KΩ to 100GΩ with a tolerance of ±1%.

LVC Series - Low Value Thick Film Chip: The LVC Series is designed for current sense applications requiring low profile and cost-effective solutions. Available in 0.25, 0.5, and 1 watt sizes, with footprints of 1206, 2010, and 2512 respectively. Resistance ranges from 0.05 ohm to 1 ohm with standard ±5% tolerance.

LVK Series - Four Terminal High Precision Current Sense: The LVK Series features a four-terminal 'Kelvin' configuration for accurate current measurement by isolating voltage and current terminals. It offers excellent Temperature Coefficient of Resistance (TCR) and is made from a durable, anti-corrosive metal alloy.

Procedures: The document outlines the ordering information for both LVK and MMC series, specifying the case size, tolerance, resistance, and packaging options. It also provides derating specifications, indicating how the power rating decreases with increasing ambient temperature.

Standards and Norms: The resistors comply with various MIL-STD-202 test methods for humidity, dielectric withstanding voltage, insulation resistance, thermal shock, load life, resistance to solvents, shock, and vibration. These standards ensure the reliability and performance of the resistors under different environmental conditions.

Recommendations: For optimal performance, it is recommended to use silver solder for Macrochip resistors to prevent leaching of the silver in the termination. The document also suggests checking product availability on the Ohmite website.

Key Data from Tables and Graphs: The tables provide detailed dimensions for land patterns and reel specifications for different series. The derating graph illustrates the relationship between ambient temperature and the percentage of rated power, highlighting the recommended operating area.

Critical Information: Key parameters include resistance tolerance (0.5% and 1%), operating temperature range (-40°C to +125°C for LVK series), and voltage ratings (up to 10.0KV for Macrochip series). The document emphasizes the importance of selecting the correct resistor based on application requirements such as power rating, resistance range, and environmental conditions.

All Ohmite catalogs and technical brochures

Archived catalogs

Ohmite Catalog Revised October 26, 2011
118 Pages