DISCRETE SEMICONDUCTORS DATA SHEET M3D319 BB178 VHF variable capacitance diode Product specification 1997 Nov 13 Philips Semiconductors Product specification FEATURES DESCRIPTION • Excellent linearity • Very low series resistance. The BB178 is a planar technology variable capacitance diode, in a SOD523 (SC-79) package. The excellent matching performance is achieved by gliding matching and a direct matching assembly procedure. APPLICATIONS PINNING • Excellent matching to 2% DMA • Ultra small plastic SMD package • C28: 2.6 pF; ratio: 15 • Electronic tuning in VHF television tuners, band B up to 460 MHz • Voltage controlled oscillators (VCO). BB178 handbook, 1 2 columns 2 8 VHF variable capacitance diode MBK441 Marking code: 8. Orientation of marking code as shown. Cathode side indicated by a bar. PIN DESCRIPTION 1 cathode 2 anode Fig.1 Simplified outline (SOD523; SC-79) and symbol. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT − 32 V − 35 V continuous forward current − 20 mA Tstg storage temperature −55 +150 °C Tj operating junction temperature −55 +125 °C VR continuous reverse voltage VRM peak reverse voltage IF in series with a 10 kΩ resistor ELECTRICAL CHARACTERISTICS Tj = 25 °C unless otherwise specified. SYMBOL IR PARAMETER reverse current CONDITIONS MIN. TYP. MAX. UNIT VR = 30 V; see Fig.3 − − 10 nA VR = 30 V; Tj = 85 °C; see Fig.3 − − 200 nA 0.8 Ω rs diode series resistance f = 100 MHz; VR is the value at which Cd = 30 pF − 0.65 Cd diode capacitance VR = 1 V; f = 1 MHz; see Figs 2 and 4 34.65 − 42.35 pF VR = 28 V; f = 1 MHz; see Figs 2 and 4 2.361 − 2.754 pF C d ( 1V ) -----------------C d ( 2V ) capacitance ratio f = 1 MHz − 1.3 − C d ( 1V ) -------------------C d ( 28V ) capacitance ratio f = 1 MHz 13.5 − − C d ( 25V ) -------------------C d ( 28V ) capacitance ratio f = 1 MHz − 1.08 − ∆C d ---------Cd capacitance matching VR = 1 to 28 V; in a sequence of 15 diodes (gliding) − − 2 1997 Nov 13 2 % Philips Semiconductors Product specification VHF variable capacitance diode BB178 GRAPHICAL DATA MBK438 50 handbook, full pagewidth Cd (pF) 40 30 20 10 0 10 −1 1 10 10 2 VR (V) f = 1 MHz; Tj = 25 °C. Fig.2 Diode capacitance as a function of reverse voltage; typical values. MLC816 10 3 handbook, halfpage TC d (K−1) IR (nA) 10 4 102 10 MLC815 10 3 handbook, halfpage 0 50 o T j ( C) 10 5 10 1 100 1 10 VR (V) Tj = 0 to 85 °C. Fig.4 Fig.3 Reverse current as a function of junction temperature; maximum values. 1997 Nov 13 3 Temperature coefficient of diode capacitance as a function of reverse voltage; typical values. 102 Philips Semiconductors Product specification VHF variable capacitance diode BB178 PACKAGE OUTLINE Plastic surface mounted package; 2 leads SOD523 A c v M A HE A D 1 E 0 0.5 1 mm scale 2 DIMENSIONS (mm are the original dimensions) bp (1) UNIT A bp c D E HE v mm 0.7 0.5 0.35 0.25 0.2 0.1 1.3 1.1 0.9 0.7 1.7 1.5 0.15 Note 1. The marking bar indicates the cathode. OUTLINE VERSION SOD523 1997 Nov 13 REFERENCES IEC JEDEC EIAJ SC-79 4 EUROPEAN PROJECTION ISSUE DATE 98-11-25 Philips Semiconductors Product specification VHF variable capacitance diode BB178 DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. 1997 Nov 13 5 Philips Semiconductors Product specification VHF variable capacitance diode BB178 NOTES 1997 Nov 13 6 Philips Semiconductors Product specification VHF variable capacitance diode BB178 NOTES 1997 Nov 13 7 Philips Semiconductors – a worldwide company Argentina: see South America Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. +61 2 9805 4455, Fax. +61 2 9805 4466 Austria: Computerstr. 6, A-1101 WIEN, P.O. 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