Vishay has announced the release of three new high-precision Bulk Metal Z-Foil surface-mount resistor networks that offer a combination of stability features in the ball grid array (BGA) format. The devices provide absolute TCR of ±0,05 ppm/°C from 0°C to +60°C and ±0,2 ppm/°C from -55°C to + 125°C, + 25°C reference PCR tracking (delta R due to self heating) of ±5 ppm at rated power, and a load life stability ratio of ±0,01% (100 ppm) for 2000 hours at + 70°C.
The resistor networks include the 2-resistor VFB1012D voltage divider, the 3-resistor VFB1515N and 4-resistor VFB2028N. They provide tight tolerance matching of ±0,01 % and TCR tracking of 0,1 ppm/°C between multiple resistors simultaneously etched on one piece of foil on a common substrate. By eliminating the need for wraparound terminations, the BGA packaging of the resistor networks virtually eliminates channel noise between the PCB and the resistive element. The devices have a thermal stabilisation time of less 1 second and a 1 ns rise time.
The networks offer a broad resistance range from 100 Ω to 30 kΩ with a large variety of resistance ratios. Like all Vishay Foil resistors, the VFB1012D, VFB1515N and VFB2028N are not restricted to standard values, and can be supplied with custom values at no extra cost or delivery time. Applications include bridge networks, differential amplifiers and ratio arms in bridge circuits for ultra-stable and high-reliability products, such as medical, test and military equipment.
The resistor networks offer a power rating from 0,1 W per resistor at +70°C; a maximum working voltage of 32 V for each element; a low voltage coefficient of less than 0,1 ppm/V; current noise of less than -40 dB; and short-time overload of less than 0,01 % (100 ppm). The devices feature a non-inductive (< 0,08 μH), non-capacitive design, and offer ESD immunity, withstanding electrostatic discharges up to 25 kV. They are available with lead-free and tin/lead alloy terminations.
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