Accessible (of a part): Able to be touched with a standard test finger or test pin, when used as specified in (4)

Architecture, The organizational structure of a system or a software item, identifying its components, their interfaces and a concept of execution among them. (1) def. (4)

Barrier: A part providing protection against direct contact from any usual direction of access. (4)

Bus, A conductor or group of conductors that serves as a common connection for two or more circuits. (1) def. (8)


Classification, A choice within a category, (1) def. (1)

Class, A category into which objects are placed on the basis of both their purpose and their internal structure. (1) def. (1)


Reference zones,

Clearance: The shortest distance in air between two conductive parts. (4)

Communication, The transmission of information from one point to another by means of electromagnetic waves. (1) def. (1)

Control, The execution of a system change by manual means, remote means, automatic means, or partially automatic means. (1) def. (7). A device or group of devices that serves to govern in some predetermined manner the electric power delivered to the apparatus to which it is connected. (1) def. (3)

Creepage distance: The shortest distance along the sruface of the insulating material between two conductive parts. (4)


Current limit,

Maximum rated current,

Nominal current,

Overload current,

(EMI) Electro Magnetic Interference,




Enclosure: A part providing protection of a module against certain external influences and , in any direction, protection against direct contact. (4)


Operating environment,

Storage environment,

System environment,

Gate drivers,

Hazardous Live: Capable of rendering an electric shock or electric burn in normal condition or single fault condition (4)

High integrity: Not liable to become defective in such a manner as to cause a risk of hazard within the sense of this recommended practice; a high integrity part is considered as not subject to failure when tests under fault conditions are made. (4)


Basic insulation: Insulation, the failure of which could cause the risk of electric shock. Basic insulation may serve also for functional purposes. (4)

Supplementary Insulation: Independent insulation applied in addition to basic insulation in order to provide protection against electric shock in the event of a failure of basic insulation. (4)

Double insulation: Insulation comprising both basic insulation and supplementary insulation. (4)

Reinforced insulation: Insulation which provides protection against electric shock not less than that provided by double insulation. It may comprise several layers which cannot be tested singly as supplementary insulation or basic insulation. (4)

Installation category (Overvoltage Category): Classification of parts of installation systems or circuits with standardized limits for transient overvoltages, dependent on the nominal line voltage to earth (see IEC 664, 664A) (4)


Integrated passives,


Control interface,

Mechanical interface,

Thermal interface,

Power interface,

Interface schematic,

Level 0,1,2,



Dumb module,

Integrated module,

Passive module,

Power module,

(PEM) Power Electronic Module,

Smart module,

Switch module,

Normal use: Operation, including stand-by, according to the instruction for use or for the obvious intended purpose. In most cases, normal use also implies normal condition, because the instructions for use will warn against using the equipment when it is not in normal condition. (4)

Normal condition: condition in which all means for protection against hazards are intact. (4)

Pollution: Any addition of foreign matter, solid, liquid or gaseous (ionized gases), that may produce a reduction of dielectric strength or surface resistivity. (4)

Pollution Degree: for the purpose of evaluating clearances the following two degrees of pollution in the micro-environment are recognized for use with this recommended practice. (4)

Pollution Degree 1: No pollution or only dry, non-conductive pollution occurs. The pollution has no influence. (4)

Pollution Degree 2: Normally only non-conductive pollution occurs. Occasionally, however, a temporary conductivity caused by condensation must be expected. (4)

Note: we need a more severe rating for automotive application.

Power conversion stage,

Protective impedance: A component, assembly of components, or the combination of a basic insulation and a current or voltage limiting device, the impedance, construction and reliability of which are such that when connected between parts which are hazardous live and accessible conductive parts, it provides protection to the extended required by this recommended practice in normal condition and single fault condition. (4)

Protective bonding: Electrical connection of accessible conductive parts and/or of protective screening to provide electrical continuity to the means for connection of an external protective conductor. (4)

(PWM) Pulse Width Modulation,

Rated (value): A quantity value assigned, generally by a manufacturer, for a specified operating condition of a component, device, or module. (4)

Rating: the set of rated values and operating conditions. (4)

Power Rating,

Output power rating,

Thermal power rating,

Safety Terms

see Accessible

see Hazardous Live

see High integrity

see Protective impedance

see Protective bonding

see Normal use

see Normal condition

see Single fault condition


Isolated sensors,

Single fault condition: condition in which one means for protection against hazard is defective. If a single fault condition results unavoidably in another single fault condition, the two failures are considered as one single fault condition.(4)


Single Switch,

Dual Switch,

Triple Switch,

Half Leg,

Full Leg,


Terminal: A component provided for the connection of a module to external conductors. (4)

Functional Earth Terminal: A terminal by which electrical connection is made directly to a point of a measuring or control circuit or to a screening part and which is intended to be earthed for any functional purpose other than safety. (4)

Protective Conductor Terminal: A terminal by which electrical connection is made directly to a point of a measuring or control circuit or to a screening part and which is intended to be connected to an external protective earthing system. (4)


Type Test: A test of one or more samples of a module (or component) made to a particular design, to show that the design and construction meet one or more requirements of this recommended practice. This test may be destructive. (4)

Routine Test: A test to which each individual module (or component ) is subjected during or after manufacture to ascertain whether is complies with certain criteria.(4)



Thermal management,



Breakdown voltage,

Maximum rated voltage,

Nominal voltage, The voltage by which the power module is designated and to which certain operating quantities of the power module are related



(1)Jane Radatz, Chair Standards Coordinating Committee 10, terms and definitions, The IEEE standard Dictionary of Electrical and Electronics Terms, 6th Edition, IEEE Std 100-1996

(2)R Tummala, E Rmaszewski Ed, Microelectronics Packaging Handbook, Van Nostrand Reinhold, 1989

(3)Charles Harper Ed., Electronic Packaging and Interconnection Handbook, McGraw Hill, 1991

(4) IEC1010-1