New thin film wraparound chip resistor reduces board space

New Yorker Electronics has released the new Vishay Dale PHPA Series of Thin Film Wraparound Chip Resistors. The new resistors include the self-passivated tantalum nitride film to give increased moisture resistance and improved ESD, voltage coefficient and resistance stability performance. These features provide for high thermal stability in harsh or hazardous environmental conditions.

The AEC-Q200 qualified series combines power ratings of 1W and 2.5W in the 1206 and 2512 case sizes, respectively. They notably lessen board space and component counts by substituting larger or paralleled resistors. Vishay PHPA resistors are created with enlarged backside terminations to decrease the thermal resistance between the topside resistor layer and the solder joint on the end user’s circuit board.

Most thin film chip resistors provide a low power capability. Therefore, several chips must be employed to accommodate higher power applications. In hazardous or unstable environmental conditions, resistors must be fabricated with resistive materials to handle the elements. The series is fabricated with Ta2N. This provides superior moisture resistance and high thermal stability in harsh conditions. In addition, the devices’ power capability far exceeds the industry standard.

The 1206 case size provides a resistance range of 12 to 30.1Ohm, while the 2512 supplies a range of 10 to 30.1Ohm. The resistors have an ESD rating of 5A (HBM), a resistor tolerance to ± 0.1% and TCR to ±25 ppm/C. These qualities offer new product design advantages such as reduced component count, increased design flexibility with higher power capability, reduced assembly costs and improved board-level reliability.

The resistor’s actual power-handling capability is limited by the end-user mounting process. As with any high power chip resistor, the ability to remove the generated heat is critical to the overall performance of the device.

Typical applications include power supplies, power switching, braking systems, test and measurement equipment, and motor deflection circuits.