Serviceline Industrial Sensors
Serviceline Explosion Protection

SMART Transmitter Power Supply KFD2-STC5-2

  • 2-channel signal conditioner
  • 24 V DC supply (Power Rail)
  • Input 2-wire and 3-wire SMART transmitters and 2-wire SMART current sources
  • Output 4 mA ... 20 mA current sink/current source
  • Terminals with test points
  • Up to SIL 2 acc. to IEC/EN 61508

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  KFD2-STC5-2

General specifications
Signal typeAnalog input
Functional safety related parameters
Safety Integrity Level (SIL)SIL 2
ConnectionPower Rail or terminals 14+, 15-
Rated voltage18 ... 30 V DC
Ripplewithin the supply tolerance
Power dissipation≤ 1.4 W at maximum load
Power consumption≤ 2.6 W at maximum load
Connection sidefield side
Connectionterminals 1+, 2-, 3; 4+, 5-, 6
Input signal4 ... 20 mA
Open circuit voltage/short-circuit currentterminals 1+, 3; 4+, 6: 23 V / 25 mA
Input resistancemax. 265 Ω terminals 2-, 3; 5-, 6 , max. 330 Ω terminals 1+, 3; 4+, 6
Available voltage≥ 16 V at 20 mA ; ≥ 20 V at 4 mA , terminals 1+, 3; 4+, 6
Connection sidecontrol side
Connectionterminals 7+, 8-, 9-; 10+, 11-, 12- (sink)
terminals 7-, 8+, 9+; 10-, 11+, 12+ (source)
see additional information
Load0 ... 600 Ω
Output signal4 ... 20 mA (overload > 25 mA)
Ripplemax. 50 µA rms
External supply (loop)2 ... 30 V DC
If the external voltage is > 19 V, a load ≥ ((V - 19) / 0.02) Ω is required. V represents the value of the external voltage.
The internal 250 Ω resistor at terminals 9 and 12 can be used as a load.
Transfer characteristics
Deviationat 20 °C (68 °F), 4 ... 20 mA
≤ 10 µA incl. calibration, linearity, hysteresis, loads and fluctuations of supply voltage
Influence of ambient temperature≤ 0.25 µA/K
Frequency rangefield side into the control side: band width with 1 Vpp signal 0 ... 7.5 kHz (-3 dB)
safe area to hazardous area: band width with 1 VSS signal 0.3 ... 7.5 kHz (-3 dB)
Settling time200 µs
Rise time/fall time100 µs
Galvanic isolation
Input/Outputbasic insulation according to IEC 61010-1, rated insulation voltage 300 Veff
Input/power supplybasic insulation according to IEC 61010-1, rated insulation voltage 300 Veff
Output/power supplyfunctional insulation, rated insulation voltage 50 V AC
Output/Outputfunctional insulation, rated insulation voltage 50 V AC
Display elementsLED
Labelingspace for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EUEN 61326-1:2013 (industrial locations)
Electromagnetic compatibilityNE 21:2012
EN 61326-3-2:2008
Degree of protectionIEC 60529:2001
Protection against electrical shockUL 61010-1:2012
Ambient conditions
Ambient temperature-20 ... 70 °C (-4 ... 158 °F)
Mechanical specifications
Degree of protectionIP20
Connectionscrew terminals
Massapprox. 150 g
Dimensions20 x 124 x 115 mm (0.8 x 4.9 x 4.5 inch) (W x H x D) , housing type B2
Mountingon 35 mm DIN mounting rail acc. to EN 60715:2001
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see


ECLASS 11.027210119
ECLASS 10.0.127210119
ECLASS 9.027210119
ECLASS 8.027210119
ECLASS 5.127210119
ETIM 8.0EC001485
ETIM 7.0EC001485
ETIM 6.0EC001485
ETIM 5.0EC001485
UNSPSC 12.132101514

Details: KFD2-STC5-2


This signal conditioner provides the galvanic isolation between field circuits and control circuits.

The device supplies 2-wire and 3-wire SMART transmitters, and can also be used with 2-wire SMART current sources.

It transfers the analog input signal as an isolated current value.

Digital signals may be superimposed on the input signal on the field side or on the control side and are transferred bi-directionally.

The device provides a sink mode or a source mode output on the control side terminals.

The device has an internal resistor. Use this resistor if the HART communication resistance in the control circuit is too low.

Test sockets for the connection of HART communicators are integrated into the terminals of the device.

Product Documentation: KFD2-STC5-2

Language Selection:
Safety and Security DocumentationLanguageFile TypeFile Size
Instruction manualENGPDF41 KB
Functional Safety ManualENGPDF2024 KB
System Manual ENGPDF3673 KB

Design / Simulation: KFD2-STC5-2

Language Selection:
CADLanguageFile TypeFile Size
3-D model / 3-D-ModellALLSTP3048 KB
CAD Portal / CAD PortalALLLINK---
CAE EPLAN Data Portal / CAE EPLAN Data PortalALLLINK---
EPLAN macro P+F.KFD2-STC5-2.edz / EPLAN-Makro P+F.KFD2-STC5-2.edzALLEDZ101 KB

Approvals: KFD2-STC5-2

Language Selection:
CertificatesCertificate No.LanguageFile TypeFile Size
USA Canada UL Hazardous Location Certificate of Compliance cULus UL E106378CoC E106378 RepRef E106378-20171103ALLPDF413 KB
Declaration of Conformity
EU-Declaration of conformity / EU-KonformitätserklärungDOC-3647AALLPDF100 KB
UK-Declaration of conformity / UK-KonformitätserklärungDOC-5298ALLPDF63 KB

Associated Products: KFD2-STC5-2

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