The 40V rating enhances reliability when used in secondary-side synchronous rectification circuits for telecom and datacom systems where a wide range input voltage of 36V to 75V is typically used. This can develop a voltage swing on the secondary side in the range of 5V to 12V, therefore requiring a 40V MOSFET since a 30V rated device does not provide the required voltage rating headroom. The new 40V device expands the IR offering of secondary-side power management switch devices for telecommunication systems.
The IRF7842 achieves 95.2% efficiency at 150W full load when used for secondary-side synchronous rectification in an isolated DC-DC bus converter featuring IR's IR2085S primary-side PWM IC. The IRF7842 also delivers as much as 0.5% higher efficiency when compared to industry-standard 40V devices in the same DC-DC bus converter.
| Part Number | BVDSS | VGS | RDS(on) max. @10V | RDS(on) max. @4.5V | Qg typ. @50% VDS | QGD typ. | Package |
| IRF7842 | 40V | +/-20V | 5mOhm | 5.9mOhm | 33nC | 10nC | SO-8 |
