J599 Series III Circular Connectors (38999 Series III Type)
38999 Series III type · shell sizes 9–25 · 184 insert arrangements
38999 Series III-Type Fiber-Optic and Hybrid Connectors
Fiber + power + coax + data in one 38999 shell · ≤ 0.6 dB
These connectors combine optical fiber, power, 50 Ω coax, shielded, twinax and differential contacts in one 38999 Series III-type shell. Different contact types of the same size fit the same insert cavities, so one connector can carry power, microwave signals, high-speed data and fiber. Construction is marine grade for acid salt spray, acid atmosphere and mold.
- Optical insertion loss
- ≤ 0.6 dB (≤ 4 fibers)
- Coax
- 50 Ω, 0–18 GHz
- Differential data
- 1.65 Gbps
- Shell sizes
- 9 to 25
- Temperature
- −55 to +125 °C
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Key features
- Fiber, power, coax, shielded, twinax and differential contacts mixed in one shell
- Physical-contact fiber contacts in sizes 20, 16 and 12; expanded-beam size 16 contacts on request
- Optical insertion loss ≤ 0.6 dB (≤ 4 fibers), ≤ 0.75 dB (> 4), ≤ 1 dB in hybrid layouts
- Size 8 coax: 50 Ω, DC to 18 GHz, VSWR ≤ 1.35
- Size 8 differential contacts (2 or 4 conductors) for 1.65 Gbps
- Triple-start threaded coupling, anti-decoupling, EMI shielding; marine grade
Specifications
| Parameter | Value | Condition |
|---|---|---|
| Insertion loss | ≤ 0.6 dB / ≤ 0.75 dB | ≤ 4 fibers / > 4 fibers |
| Insertion loss, hybrid layouts | ≤ 1 dB | |
| Fiber contact sizes | 20, 16, 12 |
| Parameter | Value | Condition |
|---|---|---|
| Dielectric withstanding voltage, service rating M | 1300 / 800 Vrms | Sea level / 21,000 m, mated |
| Dielectric withstanding voltage, service rating N | 1000 / 600 Vrms | Sea level / 21,000 m, mated |
| Dielectric withstanding voltage, service rating I | 1800 / 1000 Vrms | Sea level / 21,000 m, mated |
| Dielectric withstanding voltage, service rating II | 2300 / 1000 Vrms | Sea level / 21,000 m, mated |
| Insulation resistance | ≥ 5000 MΩ | 500 VDC |
| Size 8 coax | 50 Ω, 0–18 GHz, VSWR ≤ 1.35, 750 Vrms | |
| Size 8 differential | 1.65 Gbps, 1 A, 500 VAC center-to-outer |
| Parameter | Value | Condition |
|---|---|---|
| Operating temperature | −55 to +125 °C | |
| Durability | 500 mating cycles | |
| Damp heat | 10 cycles × 24 h | |
| Sealing | Low-pressure immersion, mated | |
| Fluid resistance | Fuels, coolants, solvents |
GJB 599A Series III (type) — Chinese counterpart of MIL-DTL-38999 Series III.
Parameters not listed above — for example vibration level, leak rate or other environmental tests — can be tested to your requirements, including third-party testing.
Versions
| Series code | Version | Notes |
|---|---|---|
| J599/20M, /24M, /26M | Square-flange receptacle, jam-nut receptacle, plug (marine) | |
| Fiber | Fiber-only layouts | |
| Hybrid | Fiber + electrical layouts (layout code with E, F, G suffix) |
Shell materials and finishes
| Code | Shell material | Finish | Shell conductivity | EMI shielding | Temperature | Salt spray |
|---|---|---|---|---|---|---|
| W | Aluminum alloy | Olive-drab cadmium | 2.5 mΩ | EMI shielded | −55 to +125 °C | Marine grade |
| K | Stainless steel | Passivated | 10 mΩ | EMI shielded | −55 to +125 °C | Marine grade |
| TA | Titanium alloy | None | 10 mΩ | EMI shielded | −55 to +125 °C | Marine grade |
Contact sizes and current ratings
| Contact size | Engaging diameter | Contact resistance | Current rating | Wire size |
|---|---|---|---|---|
| 22D | 0.76 mm | ≤ 14.6 mΩ | 5 A | — |
| 20 | 1.02 mm | ≤ 7.3 mΩ | 7.5 A | — |
| 16 | 1.58 mm | ≤ 3.7 mΩ | 13 A | — |
| 12 | 2.41 mm | ≤ 1.83 mΩ | 23 A | — |
| 10 | 3.20 mm | ≤ 1 mΩ | 33 A | — |
How to order
J599/ [type] M [finish] [shell] [arrangement] [contact] [key] [design no.]
Example: J599/20MWG61G2PN — Marine square-flange hybrid receptacle, olive-drab cadmium, shell G (21), arrangement 21-61 with 2 size 16 fiber contacts, other contacts electrical, pins, key N
| Code segment | Options |
|---|---|
| Type | |
| Finish | |
| Shell | |
| Contact | |
| Key |
Plugs and receptacles are usually supplied as cable assemblies.
Fiber-only example: J599/20MWC04A1N — arrangement 13-04, fiber pins, key N.
Coax, differential and expanded-beam contacts are ordered separately; state the wavelength for expanded-beam contacts.
Typical applications
- Ship and offshore networks
- Rugged communication and radar equipment
- Rail signalling and data
- Industrial sensing
Frequently asked questions
Can I combine fiber and power in one connector?
Yes. Hybrid layouts put fiber contacts alongside power, coax and data contacts in one 38999-type shell; contacts of the same size fit the same insert cavities.
Do you supply terminated fiber assemblies?
Yes. Plugs and receptacles are usually supplied as cable assemblies; optical performance of assemblies is agreed with you.
Need a subsea hybrid?
See GDM optical-electrical hybrid underwater connectors.
Related series
J599A8 38999 Series III-Type Multi-Fiber Optical Connectors
2 to 32 fibers · ≤ 0.6 dB multimode · ≤ 0.8 dB single-mode
GDM Optical-Electrical Hybrid Underwater Connectors
Power + 4 optical fibers · 4.5 MPa mated · single-mode or multimode
From sample to production
Send your requirements
Part number, drawing, pin-out or a short description of your application.
Configuration and quote
Our engineers match the configuration and reply with a drawing and quotation.
Samples
Samples are built to order. The minimum order quantity is 10 pieces, and samples and production orders each take 4–8 weeks. Third-party testing to your specification is available on request.
Your approval
You test the samples in your own equipment and approve them.
Series production
Production follows the approved sample configuration, with machining, molding, plating and assembly in our own Shenyang factory.
Need a quote or a drawing?
Send your part number, pin-out or drawing. Every inquiry is acknowledged by email within 1 business day, and an engineer follows up with a matched configuration, drawing or quotation.
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