Schottky Rectifier Diodes for PCB and DC Power
A Schottky rectifier is a diode selected for its comparatively low forward-voltage drop and switching behavior in suitable DC power circuits. This assortment spans axial Schottky parts, small-signal BAT-series choices, surface-mount SS and SK parts, and larger dual-device packages. It also contains shared listings with conventional silicon and fast-recovery diode variants: the selected part number, not the listing headline, determines the device type.
Find the right rectifier format
- Axial low- and medium-current options: 1N5820/1N5821/1N5822, 1N5824/1N5825, SB120–SB2200 and SR540/SR560/SR5100/SR5200 are offered as distinct model choices. The 10SQ/12SQ/15SQ/20SQ/30SQ solar-labelled options show different current and reverse-voltage combinations in their variant names. They are not a single 30 A or 200 V part. Check each exact model's documented current, reverse-voltage grade, polarity and thermal conditions; a “solar” label does not establish compatibility with a particular panel or controller.
- Surface-mount Schottky choices: SS14/SS24/SS34/SS54 selections and SK34/SK54/SK84/SK86/SK810/SK1010 or SK510C variants use package-specific PCB land patterns. Some listings offer SS-series options in SMA while others say SMC, so the same family-like code is not enough to confirm footprint. Compare actual body dimensions and the manufacturer's package drawing.
- Higher-current packages: STPS41H100CG-labelled D2PAK/TO-263, VB40100C-labelled TO-263 and MBR4045WT/MBR4060WT/MBR6045WT TO-247 selections require confirmation of internal diode arrangement, per-leg versus total current, pinout/tab connection and heatsinking. A 40 A or 60 A headline is not an operating-current guarantee without the specified thermal setup.
- Small-signal Schottky: BAT41/BAT42/BAT43/BAT46 DO-35 choices are distinct from high-current power rectifiers. Compare current, reverse voltage, leakage and package before selecting for a signal or low-power path.
- Mixed or mislabeled listings: 1N4001/1N4004/1N4007 and M1/M2/M4/M7 are conventional silicon rectifiers, not Schottky parts. FR, HER, RL and UF options are separate rectifier families with different recovery characteristics; 1N4148 is a signal-switching diode. A listing that calls all these variants “Schottky” or calls an SR-series single diode a “bridge” does not change the selected device's topology. One 1N4007 listing claims 1200 V while describing DO-41 and surface mount inconsistently; verify the actual marking and datasheet rather than relying on that claim.
Selection steps for a Schottky rectifier
- Identify whether the circuit needs a single rectifier, a dual/common-terminal device or another topology. Confirm exact model and package from the chosen variant.
- Set repetitive peak reverse-voltage headroom for normal operation and expected transients. Compare forward current at the actual waveform, ambient/case temperature and cooling conditions, plus specified surge capability.
- Estimate conduction loss from forward voltage at working current and temperature. Evaluate reverse leakage at elevated temperature and the resulting heat, especially in blocking paths. Do not use a seller's voltage value entered under “Max. Forward Voltage” as a reverse rating.
- Verify physical mounting: DO-35, DO-201AD/DO-27, SMA, SMC, TO-252, TO-263/D2PAK and TO-247 are not interchangeable footprints. Check polarity, pad/tab and internal dual-device connections.
- Confirm the pack count and model selected. Imported “Color” selectors often encode the model, voltage/current grade or quantity, not appearance.
Purchasing checklist
Record exact manufacturer part number and supporting datasheet where available, device arrangement, repetitive reverse voltage, forward current and surge conditions, forward drop and leakage at relevant temperatures, package, polarity/pinout, thermal path and quantity. Product titles and generic claims of “original,” certification or universal compatibility are not substitutes for verified part-level documentation.
Frequently asked questions
Is 1N4007 a Schottky rectifier?
No. The 1N4007 options in mixed listings are conventional silicon rectifiers; choose a documented Schottky model if that technology is required.
Can I replace an SS34 SMA with an SS34 SMC without changing the PCB?
Do not assume so. The body, pad layout and thermal performance depend on the actual package drawing and part specification, even if both seller titles include SS34.
Does a 30SQ060 option mean every solar-labelled diode is 30 A and 60 V?
No. These menus include different 10SQ, 12SQ, 15SQ, 20SQ and 30SQ selections and voltage suffixes. Check the selected variant and independent device documentation.
Are FR107 and HER107 Schottky devices?
No. They are listed alongside Schottky options in some shared products, but are different rectifier families. Compare recovery, voltage, loss and thermal specifications for the exact selected part.
