MRF1511NT1

Overview

The MRF1511NT1 is an N-Channel enhancement-mode lateral MOSFET designed for broadband commercial and industrial applications up to 175 MHz. It operates optimally at 7.5 volts, delivering 8 watts of output power with a power gain of 13 dB and drain efficiency of 70%. The device features excellent thermal stability and can withstand a 20:1 VSWR under overdrive conditions. Key electrical characteristics include a maximum drain-source voltage of 40 Vdc, continuous drain current of 4 Adc, and total device dissipation of 62.5 W at 25°C case temperature.

Feature Summary

• Designed for large-signal, common source amplifier applications in portable FM equipment
• Capable of handling severe load mismatches without damage
• Characterized with series equivalent large-signal impedance parameters
• Lead-free terminations compliant with RoHS standards

Applications

• Broadband commercial RF amplifiers
• Industrial RF power applications
• Portable FM equipment power amplifiers

Procurement Notes

Verify the datasheet revision history and package style (CASE 466-03) against your specific design requirements. Confirm that the T1 suffix corresponds to the required tape and reel quantity for automated assembly processes. Ensure proper heat sinking is planned to maintain junction temperatures within the specified operating range.

Selection Notes

Select this component for designs requiring high gain and broadband performance in the VHF band. Consider the 2 °C/W thermal resistance when designing the PCB heat sink interface. Verify gate protection circuits are included, as the device lacks internal monolithic zener diodes. Evaluate stability techniques such as resistive loading or feedback if self-oscillation is a concern in your specific circuit topology.

Part Context

This part belongs to the Freescale Semiconductor (now NXP) RF Power Field Effect Transistor family. It is specifically engineered as a lateral MOSFET for VHF and UHF portable power amplifier applications. The PLD-1.5 plastic surface mount package facilitates automated pick-and-place manufacturing while providing necessary thermal management capabilities for high-power RF operations.

Replacement Considerations

Consult official cross-reference documentation for verified substitutes. Ensure any replacement maintains compatible pinout configurations, thermal resistance ratings, and electrical specifications for the target frequency range.

FAQ

What is the recommended quiescent drain current for typical applications?

The device was characterized at IDQ = 150 mA, which is the suggested value for bias current in typical applications.

Does the MRF1511NT1 have internal gate protection?

No, these devices do not have an internal monolithic zener diode from gate-to-source. External protection is recommended.

How should the gate be terminated during operation?

Circuits leaving the gate open-circuited or floating should be avoided to prevent turn-on due to voltage buildup on the input capacitor.