NMEA Buffer


Safely drive up to six NMEA Listeners,

with power distribution for the

connected Talker...




Power Supply 

Input Supply Voltage

10 to 35V DC 

Input Supply Current (NBF-3 only)

100mA max @ 12V DC (all outputs @ full drive into 100Ω loads)

Input Supply Connector

Pluggable 2 way screw terminal, 3.5mm pitch

Input Protection (NBF-3)

Continuous reverse polarity and ESD protection

Power Indicator

LED, blue (lit constantly indicates correct operation when input supply is connected)

Listener Power Output Voltage

10 to 35V DC derived directly from the input supply voltage

Listener Power Output Current

500mA max @ <=30°C (See Note)* (PTC self-resettable fuse)

Listener Power Output Connector

 Pluggable 2 way screw terminal, 3.5mm pitch



NMEA 0183 Port - Listener & Talker

Number of Listener/Input Ports

One isolated NMEA 0183 Listener 

Number of Talker/Output Ports 

Six isolated NMEA 0183 Talkers


Fully NMEA 0183, RS422 & RS232 compatible. RS485 Listener compatible

Galvanic Isolation

2500V input to ground 1500V output to ground using ISO-Drive

Speed/Baud Rate

4800 to 115200 bps

Talker Output Voltage Drive

>=2.1V (differential) into 100Ω

Talker Output Current Drive

20mA max

Talker Output Protection

Short circuit and ESD 

Listener Input Voltage Tolerance

 -15V to +15V continuous, -35V to +35V short term (<1 second) 

Listener Input Protection

Current limited, overdrive protection to 40V DC and ESD protection

Listener Data Indicator 

LED, green (flashes at data rate)


Pluggable 2-way screw terminals, 3.5mm pitch




 Housing Material


 Protective Lid Material


 Sealing Materials

Expanded silicone foam gasket closed cell polyurethane splash guard and ePTFE waterproof vent


127mm (L) x 106mm (W) x 48mm (H) 




 4 x 3.5mm lugs to allow panel mount with self tapping screws (included), optional DIN rail mount available on request.



Approvals and Certifications


IEC60945-9 (sections 9 &10)

Environmental Protection


Operating Temperature

-20°C to +70°C

Storage Temperature

-40°C to +85°C

Relative Humidity

0 to 80% RH


3 Years 



All specifications are taken with reference to an ambient temperature (TA) of +25°C

*Higher temperatures may cause the fuse to trip at less than 500mA

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