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38999 Series III-type filter connector receptacle, filter insert and planar filter array
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38999 Series III-type filter connector receptacle and plug

38999 Series III-Type EMI Filter Connectors, Marine Grade

C or π filter per contact · up to 55 dB · marine grade

These filter connectors add a planar low-pass filter to every contact of a 38999 Series III-type connector, so EMI/RFI is removed right at the enclosure wall. They keep the triple-start threaded coupling and mating interface of the standard connector and are built for marine environments with acid salt spray, acid atmosphere and mould resistance.

Filter circuits
C or π
Capacitance
75 pF to 100 nF
Insertion loss
Up to 55 dB at 100 MHz
Coupling
Triple-start thread
Temperature
−55 to +125 °C

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Key features

  • Each contact is a complete low-pass filter — C or π circuit
  • Replaces the standard connector without changing wiring; filtering and shielding in one part
  • Different filter values mixed in one connector
  • Smaller and lighter than filtering outside the connector
  • Marine grade: 240 h acid salt spray, acid atmosphere and 84-day mould
  • Aluminum (olive-drab cadmium) or titanium shells
  • Triple-start threaded coupling; scoop-proof, keyed

Specifications

Electrical
ParameterValueCondition
Insulation resistance≥ 1000 MΩ100 VDC
Dielectric withstanding voltage500 VDC, 5 s
Working voltage classes50, 100, 200 or 400 VDC
Filter circuitsC or π, planar array; mixed values in one connector
Mechanical and environmental
ParameterValueCondition
Durability500 mating cycles
Operating temperature−55 to +125 °C
Vibration10–2000 Hz, 20 g
Shock100 g
Acid salt spray240 h (5 × 48 h), pH 3.5 ± 0.5GJB 150.11A
Acid atmosphere4 cycles, pH 3.5 ± 0.5GJB 150.28
Mould84 days, grade 1 or betterGJB 150.10A

38999 Series III type — Mating interface of the standard J599 Series III connector.

Values not listed above — for example vibration level, leak rate or other environmental tests — can be tested to your requirements, including third-party testing. Specifications are subject to change; contact us for the current datasheet.

Filter values

Planar filter arrays; minimum insertion loss measured at 25 °C, no load, 50 Ω system. Actual values in use may differ.

CircuitCodeCapacitance3 dB cut-off1 MHz3 MHz10 MHz30 MHz100 MHz
C75075 pF70 MHz1 dB
C151150 pF35 MHz3 dB
C271270 pF20 MHz3 dB
C471470 pF12 MHz3 dB10 dB
C1021000 pF5.1 MHz6 dB20 dB
C2522500 pF3 MHz1 dB6 dB12 dB22 dB
C3323300 pF2.5 MHz3 dB13 dB20 dB30 dB
C4724700 pF2 MHz3 dB13 dB20 dB30 dB
C6826800 pF1.5 MHz2 dB9 dB19 dB25 dB35 dB
C10310000 pF1 MHz2 dB9 dB19 dB25 dB35 dB
C104100000 pF0.1 MHz5 dB12 dB22 dB30 dB40 dB
π471470 pF12 MHz4 dB12 dB
π1021000 pF3.2 MHz7 dB24 dB
π2522500 pF1.3 MHz1 dB6 dB16 dB25 dB
π3323300 pF1.1 MHz2 dB8 dB20 dB41 dB
π4724700 pF0.8 MHz2 dB8 dB20 dB41 dB
π6826800 pF1.5 MHz2 dB5 dB13 dB30 dB50 dB
π10310000 pF1 MHz2 dB5 dB13 dB30 dB50 dB
π104100000 pF0.1 MHz5 dB10 dB25 dB30 dB55 dB

Versions

Series codeVersionNotes
J599/20, /24, /26Square-flange receptacle, jam-nut receptacle, plug
…d…Double-flange receptacle

Shell materials and finishes

CodeShell materialFinishShell conductivityEMI shieldingTemperatureSalt spray
WAluminum alloyOlive-drab cadmium—EMI shielded−55 to +125 °C240 h acid
TATitanium alloyNone—EMI shielded−55 to +125 °C240 h acid

How to order

J599/ [type] M [finish] [d] [shell+arrangement] [contact] [key] BL [circuit] [capacitance+tol] [voltage]

Example: J599/20MWd18PNBL1103HI — Square-flange marine receptacle, olive-drab cadmium, double flange, arrangement 18, pin contacts, key N, planar filter, C circuit, 10000 pF (+100/0 %), 50 VDC

Code segmentOptions
Type
  • 20 / 24 / 26 Square-flange / jam-nut receptacle / plug
M
  • M Marine grade
Finish
  • W / TA Aluminum olive-drab cadmium / titanium
  • M / J Composite, nickel / cadmium
Flange
  • d / (none) Double / single flange
Contact
  • P / S Pin / socket
  • PC, PL / SC, SL PCB pin / socket
  • PQ / SQ Press-fit pin / socket
  • H / J 1500-cycle pin / socket (composite)
Key
  • N A B C D Key positions
Circuit
  • 1 / 2 C / π filter
Capacitance
  • e.g. 103 10 × 10³ pF = 10 nF
Capacitance tolerance
  • K / M ±10 % / ±20 %
  • S / Z / H +50/−20 %, +80/−20 %, +100/0 %
Working voltage
  • I / II / III / IV 50 / 100 / 200 (default) / 400 VDC

DC filter connectors must not be used on AC supply lines.

Tell us about surge voltages, inductive loads (relays, motors) and any conducted-susceptibility test requirements before selection.

Do not test filter connectors with a megger or AC hipot above the rated values.

Typical applications

  • Shipboard and offshore electronics
  • Power converters and motor drives
  • Communication and navigation equipment
  • Rail and industrial control units

Frequently asked questions

How do I choose the filter value?

Choose the capacitance from the frequency you need to suppress: the table lists cut-off frequency and minimum insertion loss from 1 to 100 MHz. π circuits give steeper attenuation. Send us your signal frequencies and we will recommend values per contact.

Can a filter connector replace my standard connector?

Yes. It keeps the standard mating interface and dimensions, so the wiring stays the same.

Can I mix filter values?

Yes. Different contacts can have different capacitance or no filter at all; tell us the pin-out.

Selection guides

From sample to production

  1. Send your requirement

    Part number, drawing, pin-out or a short description of your application.

  2. Configuration and quote

    Our engineers match the configuration and reply with a drawing and quotation.

  3. Samples

    Samples are made to your order. Third-party testing to your specification is available on request.

  4. Your approval

    You test the samples in your own equipment and approve them.

  5. Series production

    Production follows the approved sample configuration.

Need a quote or a drawing?

Send your part number, pin-out or drawing. An engineer will reply by email.

Request a quote

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