ULN2429 ALLEGRO
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bo OEE REN gah ONS RS pee SAS ET MATE Re ree Ng a Fee ES AS ee Ee Peale Primarily designed for use as an automotive low coolant detector, the ULN2429A monolithic bipolar integrated circuit is ideal for detecting the presence or absence of many different types of liquids in automo- oureur (X} 13} oureur tive, home, or industrial applications. Especially useful in harsh environ- ments, reverse voltage protection, internal voltage regulation, tempera- socomecran (3) Af Ca ture compensation, and high-frequency noise immunity are all incorpo- GROUND a Ce DECOUPLING rated in the design. orowo [aE oe Ca A simple probe, immersed in the fluid being monitored, is driven osensaron [} Fis} vccouruno | with an ac signal to prevent plating problems. The presence, absence, ca (A) co oer nour or condition of the fluid is determined by comparing the loaded probe 080, OUTPUT um resistance with an internal (pin 8) or external (pin 6) resistance. Typical sctsaron PF MALE) ee conductive fluids which can be sensed are tap water, sea water, weak acids and bases, wet soil, wine, beer, and coffee. Non-conductive fluids include most petroleum products, distilled water, dry soil, and vodka. owe.P8-017] The probe can be replaced with any variable-resistance element such as a photodiode or photoconductive cell, rotary or linear position sensor, or thermistor for detecting solids, non-conducting liquids, gases, etc. The high-current output is typically a square wave signal for use with an LED, incandescent lamp, or loudspeaker. A capacitor can be connected (pin 12) to provide a de output for use with inductive loads such as relays and solenoids. The ULN2429A is rated for operation with a load voltage of up to 30 volts. Selected devices, for operation up to 50 V are available as the ULN2429A-1. In all other respects, the ULN2429A and the ULN2429A-1 fluid detectors are identical. These devices are furnished in an improved 14-lead dual in-line ABSOLUTE MAXIMUM RATINGS plastic package with a copper alloy lead frame for superior thermal characteristics. However, in order to realize the maximum current- Supply Voltage, Veg handling capability of these devices, both of the output pins (1 and 14) (1 hr, at 425°C) oo. 240 (IOUS) eee cece eee SOV FEATURES Output Voltage, Voyr W High Output Current (ULN2429A -1).. 000-06 ee eee SOV W Single-Wire Probe are Curent ial 700 ma Ml Low External Parts Count (1 hit, at 425°C) oo LOA r | pall Wena hele Operating Temperature Range, Ty cteseeeeeeseen ees *M0°C to 485°C Storage Temperature Range, . eee ene asic to +150°C Always orderby complete part number: * Derate at the rate of 16.67 mW/°C above: Tye 170. [uLNeazea | sov | ULN24294-1
ELECTRICAL CHARACTERISTICS at T, = +25°C, Voc = Voyy = 12 V (unless otherwise specified). Test Characteristic Pin _|_ Test Conditions [ Min. Typ. Max. | Units | a [coat oupVaRGS | Vere [8 [Ase [oumiconvetios [Vor [1 [ R.Es0K gg atOOMA | = ee | a a CIRCUIT SCHEMATIC Vee OSCILLATOR DECOUPLING NC 4700, 47K as a : 3 @ oy ® 47K & © U o ouTPuT nv hee A Ti 7 47K 18K GROUND OSC. Rep DETECTOR DECOUPLING GROUND OUTPUT INPUT wa. No. At025
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