RF Coaxial Connectors SMA · TNC · N · BNC
The high-frequency interconnect in radar, communications, test, and electronic warfare systems. As an Amphenol authorized distributor, ADMTEC supplies the Amphenol RF lineup in Korea and will match the M39012 and UG military numbers on your drawing to a current P/N.
RF Coaxial
We start by matching the drawing number
An RF coaxial connector has one job: carry the signal without attenuating or reflecting it. Even within SMA, a mismatch in impedance, frequency band, or cable type creates reflections, and that loss comes back as system performance.
In defense procurement the larger problem is that there are two numbering systems. Drawings and procurement documents carry a military specification number like "M39012/01-0005" or a legacy designation like "UG-21B/U", while manufacturer stock and quotations move on commercial P/Ns. Bridging the two is the first gate in practice.
Send us the number exactly as it appears on the drawing and we will confirm the matching P/N. The cross reference Amphenol RF publishes is reproduced below, so you can also look it up yourself.
- Main interfaces
- SMA · TNC · N-Type · BNC
- Military specifications
- MIL-C-39012 / M39012 · M55339
- Legacy designation
- UG-xxx/U
- Families supplied
- SMP · SMPM · SMB · MCX · MMCX · 7-16 · QMA and some 60 families
Amphenol RF is a separate division from Amphenol Aerospace. Same Amphenol, but a different product group and different documentation, so the supply route is separate from circular connectors like D38999. Send us the P/N and we will confirm which division it belongs to before proceeding.
QPL / UG Cross Reference
M39012 · UG number → Amphenol P/N
Look up the military number from your drawing as written. This is the cross reference published by Amphenol RF.
M39012 is the U.S. Department of Defense QPL (Qualified Products List) specification for RF connectors. The items in this table correspond to QPL-listed parts. UG numbers are the older designation system, and they are still common on legacy equipment drawings and maintenance documents.
QPL military approved items — M39012 · M5533915 rows · tap to expand
| Military P/N | Amphenol P/N | Military P/N | Amphenol P/N |
|---|---|---|---|
| M39012/01-0005 | 082-4352 | M39012/01-0501 | 082-4425 |
| M39012/01-0503 | 082-4427 | M39012/01B0007 | 082-340 |
| M39012/01B0008 | 082-332 | M39012/05-0501 | 082-4440 |
| M39012/05-0503 | 082-4442 | M39012/16-0013 | 031-4320 |
| M39012/16-0014 | 031-4326 | M39012/16-0015 | 031-4321 |
| M39012/16-0101 | 031-3301 | M39012/16-0102 | 031-3302 |
| M39012/16-0503 | 031-4427 | M39012/21-0002 | 031-3376 |
| M39012/24-0001 | 031-4237 | M39012/24-0002 | 031-4238 |
| M39012/26-0011 | 031-2253 | M39012/26-0503 | 031-4452 |
| M39012/35-0501 | 082-4450 | M39012/35-0503 | 082-4451 |
| M39012/39-0501 | 082-4474 | M39012/55-4007 | 901-128-11 |
| M39012/55-4026 | 901-155-16 | M39012/55-4502 | 901-101-15 |
| M39012/56-4007 | 901-368-12 | M39012/56-4502 | 901-148-15 |
| M39012/59-4006 | 901-255-11 | M39012/59-4007 | 901-256-11 |
| M55339/02-30001 | 901-125-11SF | M55339/20-00201 | 082-5558 |
We can still quote if your drawing number is not in this table. The Amphenol RF lineup runs to more than 60,000 items, and this table covers only the QPL-listed subset.
UG designated items — legacy numbering38 rows · tap to expand
| UG designation | Amphenol P/N | UG designation | Amphenol P/N | UG designation | Amphenol P/N |
|---|---|---|---|---|---|
| UG-21B/U | 082-61 | UG-21C/U | 082-96 | UG-21D/U | 082-202 |
| UG-21E/U | 082-3202 | UG-22B/U | 082-62 | UG-23B/U | 082-63 |
| UG-23D/U | 082-209 | UG-23E/U | 082-3209 | UG-27A/U | 082-64 |
| UG-27B/U | 082-98 | UG-27C/U | 082-213 | UG-28A/U | 082-99 |
| UG-29A/U | 082-65 | UG-29B/U | 082-101 | UG-30/U | 082-66 |
| UG-30C/U | 082-201 | UG-30D/U | 000-91100 | UG-57B/U | 082-100 |
| UG-58/U | 082-24 | UG-58A/U | 082-97 | UG-59A/U | 082-38 |
| UG-59B/U | 082-804 | UG-83/U | 000-14000 | UG-83B/U | 000-34125 |
| UG-88/U | 031-2 | UG-88C/U | 031-202 | UG-88E/U | 031-3202 |
| UG-89/U | 031-5 | UG-91A/U | 000-7200 | UG-106/U | 083-1H |
| UG-107B/U | 082-102 | UG-111/U | 083-750 | UG-146/U | 000-4400 |
| UG-154/U | 082-59 | UG-160A/U | 082-67 | UG-167A/U | 082-104 |
| UG-175/U | 083-185 | UG-176/U | 083-168 | UG-177/U | 083-765 |
| UG-185/U | 000-4500 | UG-201A/U | 031-216 | UG-212A/U | 082-91 |
| UG-255/U | 000-2900 | UG-260/U | 031-12 | UG-260A/U | 031-21 |
| UG-260B/U | 031-212 | UG-260D/U | 031-3212 | UG-261/U | 031-15 |
| UG-273/U | 031-28 | UG-274/U | 031-8 | UG-274A/U | 031-208 |
| UG-274B/U | 031-2208 | UG-290A/U | 031-203 | UG-291/U | 031-1 |
| UG-291B/U | 031-201 | UG-291C/U | 031-2201 | UG-306/U | 031-9 · 031-9-RFP1 |
| UG-306A/U | 031-209 | UG-306B/U | 031-2209 | UG-349A/U | 031-217 |
| UG-352/U | 082-80 | UG-363/U | 083-1F | UG-414/U | 000-47000 |
| UG-414A/U | 000-47025 | UG-421B/U | 000-32225 | UG-422/U | 000-6225 |
| UG-491A/U | 031-218 | UG-492A/U | 031-220H | UG-492D/U | 031-3220 |
| UG-496/U | 082-92 | UG-535/U | 000-5675 | UG-536/U | 000-34000 |
| UG-536B/U | 000-34025 | UG-556B/U | 000-35275 | UG-560/U | 082-805 |
| UG-564/U | 082-508 | UG-568/U | 082-504 | UG-573A/U | 082-530 |
| UG-594A/U | 000-15425 | UG-603/U | 000-34500 | UG-603A/U | 000-34525 |
| UG-625/U | 000-5575 | UG-625B/U | 031-236 | UG-628A/U | 082-532 |
| UG-634/U | 082-515 | UG-646/U | 083-1AP | UG-657/U | 031-102 |
| UG-657A/U | 031-239 | UG-909/U | 031-206 | UG-910/U | 031-207 |
| UG-912/U | 031-238 | UG-913/U | 031-204 | UG-914/U | 031-219 |
| UG-931/U | 000-27000 | UG-932/U | 000-28000 | UG-932A/U | 000-27975 |
| UG-941B/U | 082-3204 | UG-959/U | 000-6775 | UG-961A/U | 000-28175 |
| UG-997A/U | 000-8975 | UG-1016A/U | 000-27075 | UG-1019/U | 000-11050 |
| UG-1033/U | 000-84975 | UG-1034/U | 000-5225 | UG-1052/U | 000-36000 |
| UG-1094/U | 031-221 | UG-1094A/U | 031-2221 | UG-1095A/U | 000-36250 |
| UG-1098/U | 031-222 | UG-1185/U | 082-312 | UG-1185A/U | 082-3312 |
| UG-1186/U | 082-313 |
UG numbers have to match down to the revision letter (B · C · D and so on). UG-21B/U and UG-21E/U, for example, map to different P/Ns. Do not drop the letter — send the number exactly as the drawing has it.
Send us whatever you know and we will find as many candidates as we can.
Interfaces
Which interface are you using?
Coupling method and upper frequency differ. They do not mate with each other, so follow what the drawing specifies.
The four main families compared4 rows · tap to expand
| Family | Coupling | Impedance | Frequency | Character |
|---|---|---|---|---|
| SMA | Threaded | 50 Ω | DC to 18 GHz (extended 34 GHz) | The highest band. Small and precise. The largest item count among the families we supply |
| TNC | Threaded | 50 Ω (75 Ω available) | DC to 11 GHz (extended 18 GHz) | The threaded version of BNC. It does not back off under vibration. IP67 option |
| N-Type | Threaded | 50 Ω | DC to 11 GHz (extended 18 GHz) | Medium size, weather resistant. Handles more power and is used on outdoor installations |
| BNC | Bayonet | 50 Ω · 75 Ω | DC to 4 GHz (extended 12 GHz) | Quarter-turn mating and unmating. Test, video, and general purpose |
Where vibration is constant, a threaded coupling (TNC · N · SMA) suits better than bayonet (BNC). TNC is close to BNC in size while being threaded, so it is often the choice when moving an existing BNC design into a vibration environment.
Other families we supply4 rows · tap to expand
| Category | Families |
|---|---|
| Subminiature · high density | SMP · SMPM · SMB · Mini-SMB · MCX · MMCX · AFI · HD-AFI |
| High frequency | 2.92 mm · 1.0-2.3 · 2.2-5 · 4.1-9.5 · 4.3-10 · 7-16 · NEX10 |
| Quick mating · sealed | QMA · HD-BNC · Mini-BNC · IP67 families |
| Other | C-Type · HN-Type · MHV · F-Type · FME · UHF · Mini-UHF · FAKRA · HSD |
Some 60 families and more than 60,000 items. Send us a P/N or the specifications for a family not listed above and we will confirm it.
Specifications
Electrical and environmental specifications by family
Values confirmed in the Amphenol RF product specification tables.
Electrical specifications7 rows · tap to expand
| Item | SMA | TNC | N-Type | BNC |
|---|---|---|---|---|
| Impedance | 50 Ω | 50 Ω | 50 Ω | 50 Ω |
| Frequency range | DC to 18 GHz (extended 34 GHz) | DC to 11 GHz (extended 18 GHz) | DC to 11 GHz (extended 18 GHz) | DC to 4 GHz (extended 12 GHz) |
| Voltage rating | 335 VRMS continuous | 500 V peak | 500 VRMS continuous | 500 VRMS max continuous |
| Dielectric withstanding voltage | 1000 VRMS min | 1500 VRMS max | 1500 VRMS max | 1500 VRMS max |
| Insulation resistance | 5000 MΩ min | 5000 MΩ min | 5000 MΩ min | 5000 MΩ min |
| RF leakage | -60 dB max (DC to 3 GHz) | -60 dB max @ 3 GHz | -90 dB max (DC to 3 GHz) | 55 dB max @ 3 GHz |
| Power handling | 75 W @ 10 GHz, 25 ºC | 316 W @ 1 GHz, 25 ºC | 300 W @ 10 GHz, 25 ºC | 316 W @ 1 GHz, 25 ºC |
For N-Type a PIM (passive intermodulation) figure of -166 dBc (2 × 43 dBm input) is published as well — a requirement in multi-carrier communication systems.
Only the BNC RF leakage is printed without a sign, as 55 dB; that is reproduced from the manufacturer's specification table as printed (the other families read -60 and -90 dB). If you have to compare shielding performance quantitatively, we will confirm it per P/N.
VSWR and insertion loss4 rows · tap to expand
| Family | VSWR | Insertion loss |
|---|---|---|
| SMA | Specified as a formula per cable group — for example .141" copper jacketed M39012 straight, 1.05 + .005 f(GHz) | .06 √(f(GHz)) dB max |
| TNC | 1.3 (-18 dB) max from DC to 11 GHz | M39012 straight 0.18 dB max @ 9 GHz · right angle 0.21 dB max @ 9 GHz |
| N-Type | M39012 straight DC to 11 GHz 1.30 (-18 dB) max · right angle DC to 9 GHz 1.35 (-16 dB), 9 to 11 GHz 1.5 (-14 dB) | Straight 0.15 dB max (DC to 9 GHz) · right angle 0.30 dB max (DC to 10 GHz) |
| BNC | 1.3 (-18 dB) max from DC to 4 GHz | 0.2 dB max @ 3 GHz |
SMA VSWR is not a single value — it is specified as a function of frequency for each cable group (.141" copper jacketed · RG-58/142 · RG-174/316 · RG-178). Tell us the cable you are using and we will confirm it against the right formula.
Environmental tests — common to all four families (per MIL-STD-202)7 rows · tap to expand
| Item | Condition |
|---|---|
| Operating temperature | −65 °C to +165 °C |
| Thermal shock | MIL-STD-202 Method 107 (high-temperature test +200 ºC) |
| Corrosion | MIL-STD-202 Method 101 condition B — 5% salt spray |
| Vibration | MIL-STD-202 Method 204 |
| Mechanical shock | MIL-STD-202 Method 213 — no discontinuity permitted |
| Moisture resistance | MIL-STD-202 Method 106 |
| Altitude | MIL-STD-202 Method 105 condition C |
Items built with styrene insulators or phosphor bronze contacts have a narrower operating temperature of −40 °C to +85 °C (SMA · N-Type). Where there is a temperature requirement, this needs confirming per P/N. Test condition levels for vibration and shock differ by family, so tell us if your procurement document specifies a particular condition.
Q&A
Frequently Asked Questions
My drawing has only a UG number — can it still be sourced?
In most cases yes. UG is a legacy designation system, but Amphenol RF maintains the corresponding commercial P/Ns, so it can be looked up directly in the cross reference above. For UG numbers not in the table we will find the matching part from the specifications.
If an item is listed under M39012, can I treat it as QPL qualified?
M39012 is the U.S. Department of Defense QPL specification for RF connectors, and the items in the cross reference Amphenol RF publishes correspond to those military numbers. Procurement documents sometimes require a particular revision or additional test reports, so send us the documents you need and we will confirm.
What is the difference between SMA and RP-SMA?
RP-SMA is reverse polarity SMA. The thread is the same, but the pin and socket of the center contact are swapped, so it will not mate properly with a standard SMA. Check whether the drawing carries the RP marking.
Do TNC and BNC mate with each other?
No. They are close in size, but BNC is bayonet and TNC is threaded, so they do not fit. TNC is often substituted because BNC backs off under vibration — in that case the connector on the other side has to be changed as well.
Is it wrong to use a 75 Ω connector in a 50 Ω system?
An impedance mismatch creates reflections at the joint and the signal is lost. At low frequency the effect may not show, but it grows as frequency rises. The rule is to match the connector to the system impedance.
Is Amphenol RF the same company that makes D38999?
The same Amphenol, but a different division. D38999 circular connectors come from Amphenol Aerospace and Socapex; RF coaxial comes from Amphenol RF. ADMTEC is an authorized distributor for both, so send us the P/N even if you are not sure which one it is and we will confirm before proceeding.
Can I get a C of C with the order?
Yes. We issue one for every order — what it covers and the original certificate are on the Authorized Distributor certification page.
Specification sources3 documents · tap to expand
Military number cross reference: Amphenol RF — QPL/UG Cross Reference · Specifications by family: Amphenol RF product specification tables (SMA · TNC · N-Type · BNC) · Distribution: Amphenol Daeshin (amphenol.co.kr). We confirm the latest revision and the exact applicable specification with you when we quote.