FR20DxIR
RedLink® Fiber Optic Receiver
for Direct High Voltage Switching
Datasheet
FR20DxIR Revision D
1
DESCRIPTION
Firecomms FR20DxIR RedLink® receiver is based on a
fully integrated photodiode with TIA, limiting amplifier
and a MOSFET open drain output to handle switching
of voltages in the range from 3 to 20 V (e.g., 3.3, 5, 12,
15 V). The part also includes an optional 1 kΩ Pull-Up
resistor R
L
.
Housed in non-conducting plastic the RedLink®
receiver connector is blue. The housings are
compatible with the Versatile Link style of fibre plug
and are optimised for use with Plastic Optic Fibre (POF).
The receiver operates over the industrial temperature
range of -40 °C to +85 °C supporting many industrial
applications where reliable command and control
response is required in electrically harsh environments.
The receiver is typically used at low switching speeds
where 12 V and 15 V power electronic devices are
being switched at kHz speeds.
AVAILABLE OPTIONS
Table 1
ORDERING INFORMATION / PART NUMBERS
5 MBd Horizontal Package
Inverting, TTL
FR20DHIR
5 MBd Vertical Package
Inverting, TTL
FR20DVIR
5 MBd Tilted Package
Inverting, TTL
FR20DWIR
FEATURES
• MOSFET output stage typically used to directly
switch 12 V and 15 V thyristor gate devices.
• Optimised for data rates from DC to 5 MBd
• Industrial temperature range -40 °C to 85 °C
• Flame retardant (UL 94 V-0) connector housings
• Fully integrated photodiode, TIA and limiting
amplifier in a single IC
• 5 V TTL/CMOS compatible I/O for ease of design
• Integrated 1 kΩ Pull-Up resistor to Vcc (R
L
)
• Low pulse width distortion
• Horizontal, Vertical and 30° Tilted options
• Compatible with Versatile Link cables and
connectors
APPLICATIONS
Table 2
APPLICATIONS
Application
Switching of 20 V, 18 V, 15 V and 12 V
thyristor gate drivers. SCR and IGBT Direct
switching
Distance
50 meters Step Index (SI) POF in typical
operating conditions
30 meters in worst case conditions
Speed
DC to 5 MBd (depending on series
resistance and load capacitance)
FR20DxIR Revision D
2
SPECIFICATIONS
IC
1, V
O
2, GND
3, V
cc
4, R
L
8, GND
5, GND
R
L
FIGURE 1
Receiver pin-out, top view
Table 3
RECEIVER PIN DESCRIPTION
Pin
Name
Symbol
1 RECEIVER OUTPUT V
0
2 RECEIVER GROUND GND
3 RECEIVER VCC V
cc
4 R
L
PULL-UP RESISTOR R
L
5 RETAINING PIN GND
8 RETAINING PIN GND
Table 4
REGULATORY COMPLIANCE
Parameter Symbol Standard Level
Electrostatic Discharge,
Human Body Model (contact ESD)
HBM Mil-STD-883 Level 2 (4 kV)
UL Certification UL 60950-1 Files No. E362227
Storage Compliance MSL J-STD-020 2a (4-week floor life)
Restriction of Hazardous Substances
Directive
RoHS
Directive 2011/65/EU
Incl. Amendment 2015/863
Certified compliant