NSR05F30NXT5G Schottky Datasheet: Key Specs & Test Data
The NSR05F30NXT5G delivers approximately 0.4 V forward drop at 500 mA with a 30 V reverse rating. This performance profile makes it an optimized choice for low-voltage power rails, high-speed switching nodes, and ultra-dense PCB layouts where thermal efficiency is critical.
Background & Package Overview
Package & Mechanical Details
The device utilizes a miniature surface-mount footprint designed for high-density integration. Proper board-land patterns are essential to prevent manufacturing defects like tombstoning.
| Parameter | Typical Value | Units |
|---|---|---|
| Package Length | 1.0 | mm |
| Package Width | 0.6 | mm |
| Pad Pitch | 0.9 | mm |
Electrical Characteristics & Absolute Maximum Ratings
DC Specifications (Vf, Ir, Vrrm)
| Parameter | Condition | Typical | Max | Units |
|---|---|---|---|---|
| Forward Voltage (Vf) | If = 500 mA, Ta=25°C | 0.40 | 0.45 | V |
| Reverse Voltage (Vrrm) | Ir < 500 µA | 30 | — | V |
| Reverse Leakage (Ir) | Vr = 30 V, Ta=25°C | 1.5 | 10 | µA |
Measured Performance vs. Datasheet
Bench validation often reveals slight variances due to measurement methodology. For high-current Schottky diodes, four-wire (Kelvin) sensing is mandatory to eliminate lead resistance errors.
| Test Point | Datasheet Typ | Bench Measured | Deviation |
|---|---|---|---|
| Vf @ 500 mA | 0.40 V | 0.42 V | +20 mV |
| Ir @ 30 V | < 5 µA | 1.8 µA | Pass |
Application Notes & Design Considerations
Thermal Management Strategy
- Copper Pour: Maximize the cathode pad area to act as a primary heatsink.
- Thermal Vias: Implement a 2x2 via array under the pad for multi-layer heat dissipation.
- Placement: Keep the diode within 2mm of the switching inductor or regulator output.
Frequently Asked Questions
What is the NSR05F30NXT5G forward voltage at 500 mA?
The typical forward voltage (Vf) is 0.40V at 500mA. However, this value is temperature-dependent and will decrease as the junction temperature (Tj) rises, which must be accounted for in thermal runaway calculations.
How should I test reverse leakage for this Schottky diode?
Apply the maximum rated reverse voltage (30V) using a precision source-measure unit (SMU). Ensure the device is shielded from ambient light and thermally stabilized, as leakage current increases exponentially with temperature.
What layout changes increase its continuous current capacity?
Reducing the thermal resistance (θJA) is key. Use at least 1-ounce copper, expand the cathode plane, and ensure low-impedance paths to the ground or power planes through multiple thermal vias.
Is it suitable for reverse polarity protection?
Yes. Due to its ultra-low Vf and 500mA current rating, it is highly effective for protecting sensitive low-voltage logic (1.8V, 3.3V) against battery reversal with minimal power loss.
Key Summary
The NSR05F30NXT5G combines a 30V/500mA rating with an efficient 0.4V Vf. Engineers should prioritize thermal layout via cathode copper expansion and validate switching performance using Kelvin sensing to ensure reliability in production-grade designs.
