EPIC www.vishay.com Vishay Sfernice Electro-Pyrotechnic Initiator Thin Film Chip Resistor FEATURES • Surface Mount Design for standard assembly process • SMD version only • Active area designed upon performances Available Available • Case size 0603 • Firing energy down to 50 μJ • Firing time down to 50 μs The electro-pyrotechnic initiator thin film chips (EPIC) are resistors dedicated to pyrotechnic applications. The EPIC resistors are based on Ta2N thin film technology deposited on specifically prepared ceramic substrate for optimized dissipation purpose. The standard case geometry (SMD) enables the implementation of assembly process commonly used in the electronic component industry (pick and place, reflow soldering on flat PCB used as header) providing high productivity. The principle of EPIC is to convert electrical energy into heat energy in a precise electro-thermal profile for the purpose of initiating a series of pyrotechnic events in a controlled energetic reaction. In the mining industry, as the bridge wire (BW) technology, the EPIC is commonly used in electronic detonators (digital blasting) for very precise rock fragmentation. The EPIC resistors are designed for any pyrotechnic application requiring very fast and reproducible ignition. • Ohmic value: 2 to 10 ± 15 % (typical) (1) • Joule effect, or flash ignition for very fast firing • Easy set up by design of firing levels • “No Fire” / “All Fire” ratio up to 70 % • Very predictable, reproducible and reliable behavior • Compatibility with pyrotechnic element has to be tested in real environment • Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 Notes * This datasheet provides information about parts that are RoHS-compliant and / or parts that are non-RoHS-compliant. For example, parts with lead (Pb) terminations are not RoHS-compliant. Please see the information / tables in this datasheet for details. (1) For ohmic value < 3 the tolerance will be discussed with Vishay Sfernice TECHNOLOGY The EPIC active area (heating zone) will be impregnated by the user with a primary pyrotechnic material (usually wet primer followed by drying) in such way to ensure an intimate contact for an optimum heat transfer of thermal energy. The geometry of the active area of the EPIC, and both the primer chemistry and its impregnation method, will determine the global performances. Note that the active area of EPIC shall not be put in direct contact with explosive powder as grain size will not ensure intimate contact and will induce non reproducible and non reliable performances. The two main characteristics of a EPIC resistor are their “All Fire” (AF) and “No Fire” (NF) performances: - “All Fire” (AF) represents the command pulse where the major amount of the dissipated energy will be transferred to the primer to generate the ignition. Customer will have to provide Vishay Sfernice with “All Fire” conditions, usually with capacitance discharge parameters or with minimum current or voltage and corresponding short pulse duration. - “No Fire” (NF) represents the immunity of the resistor with primer to the environmental electro-magnetic pollution and electric continuity test, where the major amount of the dissipated energy will be transferred to the substrate to ensure no ignition. Customer will have to provide Vishay Sfernice with “No Fire” conditions, usually maximum current or voltage and corresponding longest duration. In case of applicable capacitance discharge test the parameters shall also be provided. ASSEMBLY PRECAUTIONS In order to obtain reproducible ignition performances it is important that the assembly process fulfills the following criteria: - Do not use iron soldering method to mount the EPIC on its header because uncontrolled amount of solder could impact the heat transfer (potential misfire or ignition delay). - Take specific precautions, such as no air bubble during preparation and application of primer, in order to ensure the intimate contact of pyrotechnic primer and EPIC active area (potential misfire). - Take specific handling precaution in order not to damage EPIC active area (ex: pickup head design for pick and place or specific fixing tools in the entire assembly process). - The EPIC reliability is only guaranteed for one single reflow profile. - In case of necessity to dismantle an EPIC, another EPIC must be used (no rework is allowed) - Pay specific attention to the cleaning process after reflow soldering in order not to damage the active area and to keep it clean from various pollutions Revision: 27-Jul-15 Document Number: 53041 1 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 EPIC www.vishay.com Vishay Sfernice STANDARD ELECTRICAL SPECIFICATIONS MODEL SIZE / CASE DESIGNATION (1) RESISTANCE RANGE RESISTANCE TOLERANCE % 0603 2 to 10 15 to 30 EPIC (SMD) Note (1) Detailed dimensions are specified in Dimensions and Tolerances table. RANGE OF IGNITION PERFORMANCES MODEL EPIC “NO FIRE” CURRENT A “NO FIRE” DURATION s “ALL FIRE” CURRENT A IGNITION TIME ms “ALL FIRE” ENERGY μJ 0.3 to 0.8 2 to 5 Down to 0.8 Down to 0.05 Down to 50 Note • Ignition performances are dependent on both pyrotechnic primer chemistry and active area geometry. DIMENSIONS AND TOLERANCES in millimeters (inches) MODEL SIZE / CASE DESIGNATION WIDTH W LENGTH L THICKNESS T INSULATION DISTANCE I BACK SIDE PADS P ACTIVE AREA WIDTH TOLERANCE A 0603 1.52 ± 0.15 (0.080 ± 0.006) 0.76 ± 0.13 (0.030 ± 0.005) 0.40 ± 0.13 (0.016 ± 0.005) - 0.38 ± 0.13 (0.015 ± 0.005) ± 0.007 (± 0.0003) EPIC (SMD) CONSTRUCTION Ta2N active area Gold or Tin-Silver Nickel Ta2N Nickel Substrate • Substrate: ceramic (alumina) • Resistive element: Ta2N Revision: 27-Jul-15 Gold or Tin-Silver Substrate • Terminations: SMD wraparound • Electro-plated gold or hot dipped tin-silver on nickel Document Number: 53041 2 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 EPIC www.vishay.com Vishay Sfernice HOW TO GET THE RIGHT EPIC Each EPIC will have to be adapted to customer pyrotechnic primer chemistry (energetic material). To reach the right EPIC design it is necessary to work by “iterations”. Upon receipt of the EPIC Design Guide duly filled, an initial sampling lot is given to customer (along with a EPIC reference) so he can provide “No Firing” / “All Firing” performances obtained after first testing. After the analysis of these first test results a new set of samples will be proposed (eventually tooling charges will be necessary) in order to get closer to the customer requirements. It may be several iterations until the right design is found. It may also happen that all requirements cannot be fulfilled simultaneously and then a compromise will be necessary between EPIC design and customer pyrotechnic primer chemistry or ignition parameters. When the iterations are finished, which means that the design is validated with total or partial requirements fulfilled, Vishay Sfernice will design a final set of photomasks for serial production. ORDERING PROCEDURE Global Part Numbering: EPICxxxxGT E P I C x x x x G P T MODEL xxxx TERMINATION TYPE (1) PACKAGING (2) EPIC Determined at design step G: gold (wraparound) N: tin silver (wraparound), please consult PT = tape and reel (paper tape) W = waffle pack Notes • EPIC being a semi-custom product, please fill EPIC / MEPIC Design Guide (www.vishay.com/doc?53045) and send to [email protected] to get appropriate part number. (1) Gold termination finish valid for both reflow soldering and conductive gluing. Tin Silver termination finish only valid for reflow soldering. (2) Customer assembly process requirement: - Waffle pack for manual placing on PCB. - Tape and reel for automatic pick and place. Revision: 27-Jul-15 Document Number: 53041 3 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Legal Disclaimer Notice www.vishay.com Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any product. 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