diff --git a/eeschema/netform.cpp b/eeschema/netform.cpp
index 0f2e76f24d..16765e3823 100644
--- a/eeschema/netform.cpp
+++ b/eeschema/netform.cpp
@@ -302,8 +302,10 @@ public:
      * @param f = the file to write to
      * @param use_netnames = true, to use netnames in netlist,
      *                      false to use net number.
+     * @param aUsePrefix = true, adds an 'X' prefix to any reference designator starting with "U" or "IC",
+     *                     false to leave reference designator unchanged.
      */
-    bool WriteNetListPspice( FILE* f, bool use_netnames );
+    bool WriteNetListPspice( FILE* f, bool use_netnames, bool aUsePrefix );
 
     /**
      * Function MakeCommandLine
@@ -362,10 +364,12 @@ wxString EXPORT_HELP::MakeCommandLine( const wxString& aFormatString,
  * @param aUse_netnames = bool. if true, use net names from labels in schematic
  *                              if false, use net numbers (net codes)
  *   bool aUse_netnames is used only for Spice netlist
+ * @param aUsePrefix = true, adds an 'X' prefix to any reference designator starting with "U" or "IC",
+ *                     false to leave reference designator unchanged.
  * @return true if success.
  */
 bool SCH_EDIT_FRAME::WriteNetListFile( int aFormat, const wxString& aFullFileName,
-                                       bool aUse_netnames )
+                                       bool aUse_netnames, bool aUsePrefix )
 {
     bool        ret = true;
     FILE*       f = NULL;
@@ -401,7 +405,7 @@ bool SCH_EDIT_FRAME::WriteNetListFile( int aFormat, const wxString& aFullFileNam
         break;
 
     case NET_TYPE_SPICE:
-        ret = helper.WriteNetListPspice( f, aUse_netnames );
+        ret = helper.WriteNetListPspice( f, aUse_netnames, aUsePrefix );
         fclose( f );
         break;
 
@@ -1189,7 +1193,7 @@ bool EXPORT_HELP::WriteGENERICNetList( const wxString& aOutFileName )
 }
 
 
-bool EXPORT_HELP::WriteNetListPspice( FILE* f, bool use_netnames )
+bool EXPORT_HELP::WriteNetListPspice( FILE* f, bool use_netnames, bool aUsePrefix )
 {
     int                 ret = 0;
     char                line[1024];
@@ -1354,7 +1358,17 @@ bool EXPORT_HELP::WriteNetListPspice( FILE* f, bool use_netnames )
                 }
             }
 
-            ret |= fprintf( f, "%s ", TO_UTF8( comp->GetRef( sheet ) ) );
+            //Get Standard Reference Designator:
+            wxString RefName = comp->GetRef( sheet );
+
+            //Conditionally add Prefix only for devices that begin with U or IC:
+            if( aUsePrefix )
+            {
+                if( RefName.StartsWith( wxT( "U" ) ) || RefName.StartsWith( wxT( "IC" ) ) )
+                    RefName = wxT( "X" ) + RefName;
+            }
+
+            ret |= fprintf( f, "%s ", TO_UTF8( RefName) );
 
             // Write pin list:
             int activePinIndex = 0;
@@ -1407,8 +1421,24 @@ bool EXPORT_HELP::WriteNetListPspice( FILE* f, bool use_netnames )
                 }
             }
 
+            // Get Component Value Name:
+            wxString CompValue = comp->GetField( VALUE )->m_Text;
+
+            // Check if Override Model Name is Provided:
+            SCH_FIELD* spiceModelField = comp->FindField( wxT( "spice_model" ) );
+
+            if( spiceModelField )
+            {
+                // Get Model Name String:
+                wxString ModelNameStr = spiceModelField->m_Text;
+
+                // Verify Field Exists and is not empty:
+                if( !ModelNameStr.IsEmpty() )
+                    CompValue = ModelNameStr;
+            }
+
             // Print Component Value:
-            ret |= fprintf( f, " %s\t\t",TO_UTF8( comp->GetField( VALUE )->m_Text ) );
+            ret |= fprintf( f, " %s\t\t",TO_UTF8( CompValue ) );
 
             // Show Seq Spec on same line as component using line-comment ";":
             for( unsigned i = 0;  i < pinSequence.size();  ++i )
diff --git a/eeschema/netlist_control.cpp b/eeschema/netlist_control.cpp
index 9173763ebb..a3450d063e 100644
--- a/eeschema/netlist_control.cpp
+++ b/eeschema/netlist_control.cpp
@@ -29,6 +29,7 @@
 #include "dialogs/annotate_dialog.h"
 
 
+
 //Imported function:
 int TestDuplicateSheetNames( bool aCreateMarker );
 
@@ -73,6 +74,8 @@ BEGIN_EVENT_TABLE( NETLIST_DIALOG, wxDialog )
     EVT_BUTTON( ID_VALIDATE_PLUGIN, NETLIST_DIALOG::ValidatePluginPanel )
     EVT_CHECKBOX( ID_CURRENT_FORMAT_IS_DEFAULT,
                   NETLIST_DIALOG::SelectNetlistType )
+    EVT_CHECKBOX( ID_ADD_SUBCIRCUIT_PREFIX,
+                  NETLIST_DIALOG::EnableSubcircuitPrefix )
     EVT_BUTTON( ID_RUN_SIMULATOR, NETLIST_DIALOG::RunSimulator )
 END_EVENT_TABLE()
 
@@ -238,7 +241,13 @@ void NETLIST_DIALOG::InstallPageSpice()
     page->m_IsCurrentFormat = new wxCheckBox( page, ID_CURRENT_FORMAT_IS_DEFAULT,
                                               _( "Default format" ) );
     page->m_IsCurrentFormat->SetValue( m_Parent->m_NetlistFormat == NET_TYPE_SPICE );
-    page->m_LeftBoxSizer->Add( page->m_IsCurrentFormat, 0, wxGROW | wxALL, 5 );
+    page->m_LeftBoxSizer->Add( page->m_IsCurrentFormat, 1, wxGROW | wxALL, 5 );
+
+    page->m_AddSubPrefix = new wxCheckBox( page, ID_ADD_SUBCIRCUIT_PREFIX,
+                                           _( "Prefix references 'U' and 'IC' with 'X'" ) );
+    page->m_AddSubPrefix->SetValue( m_Parent->m_AddSubPrefix );
+    page->m_LeftBoxSizer->Add( page->m_AddSubPrefix, 0, wxGROW | wxALL, 5 );
+
 
     wxString netlist_opt[2] = { _( "Use Net Names" ), _( "Use Net Numbers" ) };
     m_UseNetNamesInNetlist = new wxRadioBox( page, -1, _( "Netlist Options:" ),
@@ -402,6 +411,24 @@ void NETLIST_DIALOG::SelectNetlistType( wxCommandEvent& event )
 }
 
 
+/* Called when the check box "default format" is clicked
+ */
+void NETLIST_DIALOG::EnableSubcircuitPrefix( wxCommandEvent& event )
+{
+
+    NETLIST_PAGE_DIALOG* CurrPage;
+
+    CurrPage = (NETLIST_PAGE_DIALOG*) m_NoteBook->GetCurrentPage();
+
+    if( CurrPage == NULL )
+        return;
+
+    if( CurrPage->m_AddSubPrefix->IsChecked() )
+        m_Parent->m_AddSubPrefix = true;
+    else
+        m_Parent->m_AddSubPrefix = false;
+}
+
 void NETLIST_DIALOG::NetlistUpdateOpt()
 {
     int ii;
@@ -486,7 +513,8 @@ void NETLIST_DIALOG::GenNetlist( wxCommandEvent& event )
     else
         g_NetListerCommandLine.Empty();
 
-    m_Parent->CreateNetlist( CurrPage->m_IdNetType, dlg.GetPath(), g_OptNetListUseNames );
+    m_Parent->CreateNetlist( CurrPage->m_IdNetType, dlg.GetPath(), g_OptNetListUseNames,
+                             CurrPage->m_AddSubPrefix->GetValue() );
 
     WriteCurrentNetlistSetup();
 
@@ -508,7 +536,8 @@ void NETLIST_DIALOG::GenNetlist( wxCommandEvent& event )
  * @return true if success.
  */
 bool SCH_EDIT_FRAME::CreateNetlist( int aFormat, const wxString& aFullFileName,
-                                    bool aUse_netnames )
+                                    bool aUse_netnames,
+                                    bool aUsePrefix )
 {
     SCH_SHEET_LIST sheets;
     sheets.AnnotatePowerSymbols();
@@ -540,7 +569,7 @@ Do you want to annotate schematic?" ) ) )
     screens.SchematicCleanUp();
 
     BuildNetListBase();
-    bool success = WriteNetListFile( aFormat, aFullFileName, g_OptNetListUseNames );
+    bool success = WriteNetListFile( aFormat, aFullFileName, g_OptNetListUseNames, aUsePrefix );
 
     return success;
 }
@@ -558,7 +587,7 @@ void NETLIST_DIALOG::RunSimulator( wxCommandEvent& event )
     wxString   ExecFile, CommandLine;
 
     g_SimulatorCommandLine = m_PanelNetType[PANELSPICE]->m_CommandStringCtrl->GetValue();
-    g_SimulatorCommandLine.Trim( 	false );
+    g_SimulatorCommandLine.Trim( false );
     g_SimulatorCommandLine.Trim( true );
     ExecFile = g_SimulatorCommandLine.BeforeFirst( ' ' );
 
@@ -573,7 +602,8 @@ void NETLIST_DIALOG::RunSimulator( wxCommandEvent& event )
     NETLIST_PAGE_DIALOG* CurrPage;
     CurrPage = (NETLIST_PAGE_DIALOG*) m_NoteBook->GetCurrentPage();
 
-    if( ! m_Parent->CreateNetlist( CurrPage->m_IdNetType, fn.GetFullPath(), g_OptNetListUseNames ) )
+    if( ! m_Parent->CreateNetlist( CurrPage->m_IdNetType, fn.GetFullPath(),
+                                   g_OptNetListUseNames,CurrPage->m_AddSubPrefix->GetValue() ) )
         return;
 
     ExecuteFile( this, ExecFile, CommandLine );
diff --git a/eeschema/netlist_control.h b/eeschema/netlist_control.h
index d098fbbfd3..c63507a900 100644
--- a/eeschema/netlist_control.h
+++ b/eeschema/netlist_control.h
@@ -19,7 +19,8 @@ enum id_netlist {
     ID_VALIDATE_PLUGIN,
     ID_DELETE_PLUGIN,
     ID_NETLIST_NOTEBOOK,
-    ID_CHANGE_NOTEBOOK_PAGE
+    ID_CHANGE_NOTEBOOK_PAGE,
+    ID_ADD_SUBCIRCUIT_PREFIX,
 };
 
 /* panel (notebook page) identifiers */
@@ -46,6 +47,7 @@ class NETLIST_PAGE_DIALOG : public wxPanel
 public:
     int               m_IdNetType;
     wxCheckBox*       m_IsCurrentFormat;
+    wxCheckBox*       m_AddSubPrefix;
     WinEDA_EnterText* m_CommandStringCtrl;
     WinEDA_EnterText* m_TitleStringCtrl;
     wxButton*         m_ButtonCancel;
@@ -112,6 +114,7 @@ private:
     void    NetlistUpdateOpt();
     void    OnCancelClick( wxCommandEvent& event );
     void    SelectNetlistType( wxCommandEvent& event );
+    void    EnableSubcircuitPrefix( wxCommandEvent& event );
     void    AddNewPluginPanel( wxCommandEvent& event );
     void    DeletePluginPanel( wxCommandEvent& event );
     void    ValidatePluginPanel( wxCommandEvent& event );
diff --git a/include/wxEeschemaStruct.h b/include/wxEeschemaStruct.h
index dcb17c004d..13e4efd062 100644
--- a/include/wxEeschemaStruct.h
+++ b/include/wxEeschemaStruct.h
@@ -62,6 +62,7 @@ public:
     SCH_SHEET_PATH*       m_CurrentSheet;    ///< which sheet we are presently working on.
     int m_Multiflag;
     int m_NetlistFormat;
+    int m_AddSubPrefix;
     bool                  m_ShowAllPins;
     wxPoint               m_OldPos;
     LIB_EDIT_FRAME*       m_LibeditFrame;
@@ -289,7 +290,8 @@ public:
      */
     bool         CreateNetlist( int             aFormat,
                                 const wxString& aFullFileName,
-                                bool            aUse_netnames );
+                                bool            aUse_netnames,
+                                bool            aUsePrefix );
 
     /**
      * Function  WriteNetListFile
@@ -303,7 +305,8 @@ public:
      */
     bool         WriteNetListFile( int             aFormat,
                                    const wxString& aFullFileName,
-                                   bool            aUse_netnames );
+                                   bool            aUse_netnames,
+                                   bool aUsePrefix );
 
     /**
      * Function DeleteAnnotation