FRST Series (0603, 0805, 1206, 1506, 2010, 2512) (Z1-Foil) Vishay Foil Resistors Ultra High Precision Foil Wraparound Surface Mount Chip Resistor for High Temperature Applications up to +200C, Humidity proof (85C/85% RH) to 0.015%, Stability under load of 0.02% FEATURES Humidity test : 85C/85% RH, 1000 hrs to R 0.015%, typical Temperature coefficient of resistance (TCR): 2.5 ppm/C typical (- 55 C to + 175 C, + 25 C ref.) Resistance Range: 5 to 125 k(for higher and lower values, please contact us) Resistance tolerance: to 0.01 % Power coefficient R due to self heating: Top View 5 ppm at rated power Power rating: to 750 mW at + 70 C to 150 mW at +175C INTRODUCTION Load life stability: The FRST is based on the new generation Z1- technology of 0.0025 % at 70 C, 2000 h at rated power. the Bulk Metal Precision Foil resistor elements by Vishay Stability under load: 0.02% at +175 C, 2000 h at Precision Group (VPG), which makes these resistors derated power virtually insensitive to destabilizing factors. Their element, Vishay Foil resistors are not restricted to standard values we can supply specific as required values at no extra cost based on the new Z1-Foil technology is a solid alloy that or delivery (e.g. 1K2345 vs. 1K) displays the desirable bulk properties of its parent material Thermal stabilization time < 1 s (nominal value achieved thus, it is inherently stable (less than 0.02% R after 2,000 within 10 ppm of steady state value) hrs, derated power at +175 C), noise-free and withstands Electrostatic discharge (ESD) at least to 25kV ESD to 25KV or more. The alloy is matched to the substrate Short time overload: 0.005 % and forms a single entity with balanced temperature Rise time: 1 ns effectively no ringing characteristics for an unusually low and predictable TCR over a wide range from -55 C to more than 175C. Current noise: 0.010 V /V of applied voltage RMS Resistance patterns are photo-etched to permit trimming of (< - 40 dB) resistance values to very tight tolerances. Voltage coefficient: 0.1 ppm/V Non inductive: 0.08 H The FRST series has a full wraparound termination, and was Non hot spot design especially designed for applications up to +200C. Terminal finish available: lead (Pb)-free only The FRST is available in any value within the specified Matched sets are available on request resistance range. VFR s application engineering department For higher temperature application up to +240 C and for is available to advise and make recommendations. For better performances, please contact: foil vishaypg.com non-standard technical requirements and special TABLE 1 - TOLERANCE AND TCR VS. applications, please contact us using the e-mail address in (1) RESISTANCE VALUE the footer below. (- 55 C to + 175 C, + 25 C Ref.) RESISTANCE FIGURE 1 - POWER DERATING CURVE TOLERANCE TYPICAL TCR VALUE (%) (ppm/C) () -55C +70C 100 250 to 125K 0.01 100 to < 250 0.02 75 50 to < 100 0.05 2.5 50 25 to < 50 0.1 10 to < 25 0.25 25 (2) 0.5 5 to < 10 0 -75 -50 -25 0 +25 +50 +75 +100 +125 +150 +175 +200 Ambient Temperature (C) (1) For tighter performances and non-standard values lower than 5 and above 125k, please contact VFRs application engineering using the e-mail addresses in the footer below. (2) TCR of these low value range : 10ppm/C max Document Number: 63235 For any questions, contact: foil vishaypg.com www.vishayfoilresistors.com Revision: 29-Aug-12 1 PRELIMINARY Rated Power (%) FRST Series (0603, 0805, 1206, 1506, 2010, 2512) (Z1-Foil) Vishay Foil Resistors HIGH TEMPERATURE PRODUCTS In very high-precision resistors that need to operate in an environment with temperatures above + 175 C, these Resistors are the passive building blocks of an electrical effects must be taken into account to achieve high stability circuit. They may be used for dropping the voltage, buffering with changes in load (Joule Effect) and ambient temperature. the surge when the circuit is turned on, providing feedback in a monitoring loop, sensing current flow, etc.When the The Bulk Metal Foil Resistors new Z1-Foil technology application requires stability over time and load, initial provides an order of magnitude reduction in the Bulk Metal accuracy, minimal change with temperature for more than Foil elements sensitivity to temperature changes both 200 C, resistance to moisture and a number of other external and internal with emphasis on long term stability in characteristics that will be described below, only the new high temperature environments. generation of Vishay Foil Resistors have the attributes In order to take full advantage of the low TCR and long term needed for such application. Over the past few months, there stability improvement, it is necessary to take into account the has been considerable growth in the demand for precise, differences in the resistors response to each of the stable and reliable resistors that can operate in harsh above-mentioned effects. As described below, new products environments such as 85C /85% RH and especially at high have been developed to successfully deal with these factors. temperatures to 200 C. Many analog circuits for industrial, For high temperature applications where stability and total military, aerospace, medical, down-hole, oil well and error budget is the main concern, the new generation of automotive applications require passive components such Vishay Foil resistors offers the best resilience against time at as resistors to have a minimal drift from their initial values elevated temperature. when operating above + 175 C and in humid environments. In these applications, the most important factor is the The new Vishay Foil technology allows us to produce temperature dependence and the end of life tolerance (which customer-oriented products designed to satisfy unique and is part of the stability) and to a lesser extent, the initial specific technical requirements. In addition to the special tolerance. chip stabilization under extreme environment conditions in the production line, we offer additional specially oriented post The new Vishay Foil resistors provide stabilities well under manufacturing operations (PMO) for high temperature the maximum allowable drift required by customers applications that require an even higher degree of reliability specifications through thousands of hours of operation under and stability. harsh conditions, such as the extreme temperatures and radiation-rich environments of down-hole oil-well logging Electrostatic Discharge (ESD) is another potential problem applications, in the frigid arctic, under the sea or in deep that can cause unpredictable failure in high temperature space. All Bulk Metal Foil resistors receive stabilization applications that increase the sensitivity of the resistors to processing, such as repetitive short term power overloads, to ESD. assure reliable service through the unpredictable stresses of extreme operation. Compared to Bulk Metal Foil, thick and ESD damage to electronic devices can occur at any point in thin film resistor elements are produced with a the devices life cycle, from manufacturing to field service. A non-controllable material. Heat or mechanical stresses on resistor that is exposed to an ESD event may fail immediately the resistive elements cause the particles forming the film to or may experience a latent defect. With latent defects, expand. However, after these stresses are alleviated, the premature failure can occur after the resistor is already particles in the film matrix do not return to the exact original functioning in the finished product after an unpredictable position. That degenerates their overall stability. length of service. Bulk Metal Foil resistors are capable of withstanding electrostatic discharges at least to 25 kV without Vishay Foil Resistors Ultra High Precision Bulk Metal Foil degradation. technology includes many types of resistors with a variety of standard configurations that can withstand unconventional VFRs Application Engineering department is always environmental conditions above and below the earths available to assist with any special requirements you might surface using special post manufacturing operations have. If you are not sure which resistor best suits your needs, specially developed for this purpose. The stability of a please do not hesitate to contact them for more information: resistor depends primarily on its history of exposures to high Foil vishaypg.com temperature. Stability is affected by: 1. Changes in the ambient temperature and heat from adjacent components (defined by the Temperature Coefficient of Resistance, or TCR) 2. Destabilizing thermal shock of suddenly-applied power (defined by the Power Coefficient of Resistance, or PCR) 3. Long-term exposure to applied power (load-life stability) 4. Repetitive stresses from being switched on and off www.vishayfoilresistors.com For any questions, contact: foil vishaypg.com Document Number: 63235 2 Revision: 29-Aug-12 PRELIMINARY