Buyer BOM console
LinkScope Sourcing 33 is an independent sourcing partner. A plant reply becomes comparable after frequency range, impedance, attenuation in dB, average power, connector, quantity, and the US destination sit on one sheet. Bring the drawing you already hold. The desk does not stock pads and does not speak as a connector maker.
Ask for the exact manufacturer, model, and configuration. A family name such as a fixed coaxial pad can frame the question. It cannot carry the VSWR of a different body. Return loss and VSWR describe the same match from two directions. A VSWR of 1.20:1 corresponds to a reflection coefficient of 0.20 / 2.20, about 0.0909, and a return loss near 20.8 dB. If one quote prints 1.20:1 and another prints 21 dB, check whether both figures use the same frequency points before you treat them as equal.
Impedance is usually 50 ohm for radio and lab coax, and 75 ohm appears on some video and CATV lines. Do not mix those systems on one price cell. Frequency range must name the connector and the test method. Standard SMA interfaces are often discussed up to 18 GHz, while a precision grade may be written to 26.5 GHz. Copy the limit from the datasheet of the offered part. Average power is commonly stated at 25 °C with a derating slope above that temperature. A 10 dB pad passes about 10 percent of the input power and absorbs about 90 percent in the resistors, so a 1 W input dissipates about 0.9 W in the body. Peak power and duty cycle stay on a separate row.
| Field | What to write | What still needs the supplier file |
|---|---|---|
| Attenuation | Nominal dB, such as 3, 6, 10, 20, or 30 | Tolerance and the frequency where it was measured |
| Match | VSWR or return loss, plus the band | Whether the figure is input, output, or both ports |
| Power | Average watts, peak, and ambient | Heatsink, derating curve, and duty cycle |
| Evidence | Datasheet revision you already hold | Current drawing, test basis, and lot traceability |
Commercial lines stay apart from the piece figure: currency, per-unit or whole-order basis, Incoterms, freight, duties, samples, and any tooling for a changed body. FCC equipment authorization under 47 CFR Part 2 Subpart J is a question for the assembled transmitter, not a certificate this desk issues for a passive pad. Read the procurement brief before the sheet goes out.
A pad between a radio and an antenna lowers both the wanted signal and the noise that pass through it. For a matched passive attenuator, noise figure in dB is commonly equal to the attenuation in dB. Treat that textbook relation as a check question, not as a measurement this desk performed. Gain on the radio datasheet and attenuation on the pad datasheet should be written with opposite signs so a link budget does not add them twice.
A signal generator into a spectrum analyzer often needs a pad so the analyzer input stays inside its safe level. Write the generator maximum output, the analyzer damage level, and the pad average power on one line. A 20 dB pad is a level setter here. It is not a filter, and it does not replace a limiter if the generator can still exceed the pad rating.
Inline barrels, PCB pi networks, and switched step boxes are different mechanical parts. A photograph of an SMA couple does not prove the resistor network inside. Connector mating cycle counts belong with the IEC 60512 sequence the plant cites for that exact interface. Ingress protection, when printed, applies to the sealed body on the drawing.
OEM-coded barrels and unmarked compatible barrels are an open choice. An OEM-coded part may follow a host vendor support note more directly. A compatible part may widen the plant list after frequency, power, and pin depth are checked on the exact host. New pads may show a clearer lot record. Refurbished pads need center-pin condition, plating wear, and remaining paperwork. This page does not pick a side.
Name SMA, N, BNC, 2.92 mm, or the PCB footprint. State 50 ohm or 75 ohm. State whether the pad is fixed, switched, or variable. A variable attenuator has a different control and a different accuracy statement from a fixed 10 dB barrel. Host platform, topology, and any DC block or bias tee belong in the same note so a plant does not quote a DC-shorted body into a bias line.
A 10-piece sample and a 500-piece release can come from different resistor lots. Write the US destination city when you know it. Do not invent a dock. Ask whether the date is ex-works or at the door, and whether partial cartons are allowed. Calibration or a plotted S-parameter file, if you need one, is an evidence request, not a feature this website claims to perform.
Share the product, specification, quantity, destination, and timing in the form. Plants should answer the same dB, the same watts, and the same connector. No file upload sits on this form. Describe the drawing in the text. Optional budget and a high-end, mid-range, budget, or undecided preference are buyer notes, not audited ratings.
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