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MODEL 261K Datasheet
Hamamatsu R2868is a UV TRON ultravioletdetectorthat makes use of the photoelectric effect of metal and the gas multiplication effect. It has a narrow spectralsensitivity of185 t0 260 nm, being completely insensitive to visible light. Unlike semiconductor detectors, it does not require optical visible-cut filters, thus making it easy to use. In spite of its small size, the R2868 has wide angular sensitivity (directivity) and can reliably and quickly detect weak ultraviolet radiations emitted from flame due to use of the metal plate cathode (eg. it can detect the flame of a cigarette lighter at a distance of more than 5 m.). The R2868 is well suited for use in flame detectors and fire alarms, and also in detection of invisible discharge phenomena such as corona discharge of high-voltage transmission lines.
MODEL 261K Price

JEOEC TYPE NUMBER (Note l) ZEHEH VOLTAGE (Vz) (NIOTE 4I TEST CURREbiT tizT) MAXIMUM DYNAMIC IMPEDANCE (ZZT IZT) (Note 2) MAXJMUM REVERSE ClJRRENT (IR r VR) TEST VOLTAGE (VR) MAXIMUM REGULATOR CURRENT {IzM) TA - 500c MAXIMIJM KNEE MPEDANCE ZZK IZK) (Note 2) TEST CURRENT (izk) MAXIMUM (SURGE) CURRENT {is) (Note 3)
VOLTS mA OHMS t^ VOLTS mA OHMS mA mA
1N4728A 1N4729A 1FJ4730A 1N4731A 3 3 3 6 3 9 4 3 76 69 64 58 10 10 100 100 50 10 1 276 252 234 217 40 40 40 40 1.0 1 0 1 0 1 0 1380 126 119 10 7
1H4732A 1N4733A 1N4734A 1N4735A 4 7 51 5 6 6 2 53 49 45 41 2 10 10 10 10 3 193 17 8 162 146 50 55 60 70 1. 1 0 1 0 1 0 970 89 81 73
1N4736A 1hl4737A 1N4738A 1N4739A 6 8 7 5 8 2 9 1 37 34 31 28 3.5 4 0 4 5 5 0 10 10 10 10 7 13 3 121 11 10 70 70 70 70 1 0 0.5 0 5 0 5 660 605 55 50
1N4740A 1N4741A 1N4742A 1N4743A 10 11 12 13 25 23 21 19 10 10 7 6 8 4 91 9 9 91 83 76 69 700 70 700 70 0.25 0.25 0.25 0.25 454 414 38 344
1N4744A 1H4745A 1N4746A 1N4747A 15 16 18 20 17 15 5 14 12 5 14 16 20 22 5 11.4 12.2 13.7 15.2 6l 57 50 45 700 70 75 75 0.25 0.25 0.25 0.25 304 285 25 225
1N4748A 1N4749A 1N4750A 1N4751A 22 24 27 30 11 5 10 5 9 5 8 5 23 25 35 40 5 16.7 18.2 20.6 22.8 41 38 34 30 75 75 75 100 0.25 0.25 0.25 0.25 205 19 17 15
1hf4752A 1N4753A 1N4754A 1N4755A 33 36 39 43 7.5 7 0 6 5 6 0 45 50 60 70 5 25.1 27.4 29.7 32.7 27 25 23 22 1000 100 100 150 0.25 0.25 0.25 0.25 13 5 125 115 11
1H4756A 1bl4757A 1N4758A 1N4759A 47 51 56 62 5 5 5 0 4 5 4 0 80 95 110 125 5 35.8 38.8 42.6 47.1 19 18 16 14 150 150 2000 200 0.25 0.25 0.25 0.25 95 90 80 70
1N4760A ihl4761A 1hl4762A 1N4763A 68 75 82 91 3.7 3 3 3 0 2 8 150 17 5 20 25 5 51.7 56. 62.2 69.2 13 12 11 10 2000 200 300 3000 0.25 0.25 0.25 0.25 65 60 55 50
1N4764A 100 2 5 350 5 76 0 9 3000 0 25 45


MODEL 261K on stock
5.80 (.200) 7.62 (.300) 10.16 (.400) 17.70 (.500) 15.24 (.600) 17.75 (. 700) 22.86 (.900) 27.94 (1.100) 30.48 (1.2001 35.56 (1.400) 40.64 (1.600) 43.18 (1.700) 48.26 (1.900) 53.34 (2.100) 60.96 (2.400) 68.58 (2.700) 73.66 (2.900) 78.74 (3.100)
Backplane Transceiver Logic (BTL) is a signaling standard that was invented and first introduced by National Semicon- ductor, then developed by the IEEE to enhance the perFor- mance of backplane buses. BTL transceivers feature low output capacitance drivers to minimize bus loading, a 1V nominal signal swing for reduced power consumption and receivers with precision thresholds for maximum noise im- munity. The BTL standard eliminates settling time delays that severely limit TTL bus performance, and thus provide signifi- cantly higher bus transfer rates. The backplane bus is in- tended to be operated with termination resistors (selected t match the bus impedance) connected to a 2.1V at both ends. The low voltage is typically lV.