Date: 20/02/2009

Z-foil surface-mount flip-chip voltage divider with fast thermal stabilization time

Vishay Intertechnology has enhanced its VFCD1505 surface-mount flip chip voltage divider with a thermal stabilization time of < 1 second. The device provides a low 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 Ref., a PCR tracking of ±5 ppm at rated power, and a load life stability ratio of ±0.005% (50 ppm).

The features and benefits of the device are:

1. The VFCD1505 provides tight tolerance matching of ±0.01% (available down to ±0.005 %) and TCR tracking of 0.1 ppm/°C between two resistors simultaneously etched on one piece of foil on a common substrate.
2. The flip chip termination of the VFCD1505 minimizes the board space required, as the terminal pad is under the resistor and not out to the side, as it is in with a wraparound termination.
3. In dividers that are comprised of two resistors and three terminations, the flip chip divider has three pads under the resistor rather than four to the side.
4. The VFCD1505 offers ESD immunity, withstanding electrostatic discharges up to 25 kV.
5. Either side of the divider can have a resistance specified from 1 k ohms to 10 k ohms.
6. The VFCD1505 is not restricted to standard values, and can be supplied with "as required" values (e.g., 7 k ohms vs. 7.6543 k ohms).
7. Applications for the device include instrumentation amplifiers, bridge networks, differential amplifiers, and ratio arms in bridge circuits for ultra-stable and high-reliability products, such as medical, test, and military equipment.
8. The VFCD1505 has a load-life stability ratio of ±0.005% for 2000 hours at +70°C; a power rating of 0.1 W at +70°C (divided between the two resistors proportionally to their value); a low voltage coefficient of < 0.1 PPM/V; current noise of < -40 dB; and thermal EMF of 0.05 µV/°C. It offers a fast rise time of 1.0 ns, effectively without ringing, and features a non-inductive (< 0.08 µH), non-capacitive design.

Availability: Samples and production quantities of the VFCD1505 voltage divider are available now, with lead times of 72 hours for samples, and three weeks for standard orders.