SMT Power Resistors offer ratings of ½ to 3 W.

Press Release Summary:

Models PWR2010, PWR3014, PWR4318, and PWR5322 resistors have contoured design that maximizes surface area and minimizes temperature rise. Devices have TCM of 20 ppm for resistance values greater than 10 W, 50 ppm for values less than 10 W, and 90 ppm for values less than 0.99 W. Able to handle 5x rated power for 5 sec, they offer dielectric strength of greater than 500 Vrms for over 1 min and are rated for continuous voltage for 1,000 hr, on for 1 hr and off for 0.5 hr.

Original Press Release:

Bourns Introduces Expanded Line of Surface Mount Technology (SMT) Power Resistors with Smaller Footprint

New Resistors Provide Excellent Pulse Handling for Increased Stability and Longevity Making Them Ideal for Automated Assembly

RIVERSIDE, Calif., Jan. 20 / / - Bourns, Inc., a leading manufacturer and supplier of electronic components, today announced the company's expanded line of Surface Mount Technology (SMT) power resistors that offer excellent pulse protection, smaller footprint and simple series dropping functions enabling cost-effective automated assembly. Designated Bourns PWR2010, PWR3014, PWR4318 and PWR5322, the new SMT power resistors feature high power density, low temperature coefficient with power ratings of 1/2 to 3 watts. The SMT resistors uniquely feature the characteristics of a wirewound resistor in a surface mount device (SMD) package providing improved pulse handling for greater stability over a wide temperature range and improved product longevity. Designed for a broad variety of applications that include instrumentation, telecommunications, base stations, automation and control applications, Bourns new SMT power resistors are an ideal solution for high-volume, automated assembly and as drop-in replacements for higher-priced and larger footprint parts.

"Bourns is committed to developing innovative products that exceed our customers' needs for smaller packaging, greater durability and increased product life over an extensive array of applications," said Cathal Sheehan, product marketing manager for Bourns Resistive Products Division. "Our new, expanded line of SMT power resistors offers competitive advantages in featuring a broad range of temperature requirements in much smaller packages."

Bourns' SMT power resistors are designed with a special contour that maximizes the surface area of the device and minimizes the temperature rise of the package for improved stability over time. These SMT resistors have a temperature coefficient of resistance (TCR) of 20 PPM for resistance values greater than 10 ohms, 50 PPM for resistance values less than 10 ohms and 90 PPM for resistance values less than 0.99 ohms for increased stability and durability over a wide temperature range.

Technical Specifications - Environmental Characteristics

Test Description Specifications

Thermal -55 + 0 degrees C/-3 degrees C to R +/-(2.0 % + 0.05)
Shock 150 degrees C +3 degrees C/-0
degrees C, 5 cycles, with minimum
15 minutes at each cycle

Short Time Five times rated power R +/-(0.5 % + 0.05)
Overload for 5 seconds

Solderability Immersion in solder 260 90% of contact
degrees C +/-5 degrees C covered in solder
for 5 +/-0.5 seconds

Resistance to Immersion in solder 260 degrees C R +/-(0.5 % + 0.05)
Solder Heat +/-5 degrees C for 5 +/-0.5

Dielectric Test voltage >500 Vrms for Pass
Strength greater than 1 minute

Insulation Test voltage greater than >1000 G
Resistance 500 Vrms for one minute

High Ambient temperature of R +/-(2.0 % + 0.05)
Temperature 175 degrees C +5 degrees C/-0
Exposure degrees C for 250 +/-8 hours

Low Ambient Temperature of R +/-(2.0 % + 0.05)
Temperature -65C +/-2C for 24 hours
Exposure +/- 4 hours

Load Life Rated continuous voltage R +/-(2.0 % + 0.05)
for 1000 hours (1 hour on
and 0.5 hours off) at a test
temperature of 70 degrees C
+/-2 degrees C

Pricing and Availability

Bourns' new SMT power resistors are available now. As a pricing reference, this new line is priced from $0.48-$0.77 in 5,000 piece quantities.

About Bourns

Bourns, Inc. is a leading manufacturer and supplier of automotive sensors, circuit protection solutions, magnetic products, microelectronic modules, precision potentiometers, panel controls and encoders and resistive products. Headquartered in Riverside, California, Bourns serves a broad range of markets, including telecommunications, computer, industrial, instrumentation, automotive, consumer, non-critical life support medical, audio and various other market segments. Bourns products are manufactured according to ISO-9000 standards under Six Sigma quality programs. Additional company and product information is available at the company's website at

Bourns(R) and the Bourns logo are trademarks or registered trademarks of Bourns, Inc. and may be used publicly only with the permission of Bourns and require proper acknowledgement. Other listed names and brands are trademarks or registered trademarks of their respective owners.

Company Contact:

Mikelyn Bridges

Bourns, Inc.

(951) 781-5397

Source: Bourns, Inc.

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