For loads requiring >500 mA, you can parallel two outputs. Wire two output pins together and drive their corresponding inputs together. The current will split reasonably well due to the positive temperature coefficient of the transistors.
The first page of any datasheet is a snapshot. For an SN51DP-like device, expect to see:
Helpful Tip: Before reading further, verify that the part number exactly matches your needs. Check for package variants (e.g., SN51DPR vs. SN51DPT—the suffix often indicates packaging or temperature range). sn51dp datasheet pdf
Texas Instruments (TI) owns the "SN" prefix family. Go to TI.com and search "SN51DP". If the part is obsolete, TI will often provide a "Product Folder" archive with the final datasheet revision. If TI does not host it, the part might be a clone or a custom ASIC—in which case, you need to check secondary sources.
This is gold. For the SN51DP, you will likely see a classic flyback or forward converter topology. For loads requiring >500 mA, you can parallel two outputs
| Parameter | Min | Typ | Max | Unit | |----------------------------|-------|-------|-------|------| | Supply Voltage (Load) | 0 | 24 | 50 | V | | Output Current (per pin) | 0 | 350 | 500 | mA | | Input Voltage (Logic High) | 3.0 | 5.0 | 24 | V | | Input Voltage (Logic Low) | 0 | 0.8 | 1.0 | V | | Input Current (ON) | 0.55 | 1.0 | 1.85 | mA | | Input Current (OFF) | 0 | 0 | 50 | µA |
This is the most practical page. It shows the recommended external components: The first page of any datasheet is a snapshot
Helpful advice: Do not deviate from the recommended component values or layout until you fully understand the design. Copy the example circuit exactly for your first prototype.