description recommended for high-side switching applications that benefit from separate logic and load grounds, these devices encompass load supply voltages to 50 v and output currents to -500 ma. these 8-channel source drivers are useful for interfacing between low-level logic and high-current loads. typical loads include relays, solenoids, lamps, stepper and/or servo motors, print hammers, and leds. all devices may be used with 5 v logic systems ? ttl, schottky ttl, dtl, and 5 v cmos. the device packages offered are electrically interchangeable, and will withstand a maximum output off voltage of 50 v, and operate to a minimum of 5 v. all devices in this series integrate input current limiting resistors and output transient suppression diodes, and are activated by an active high input. the suffix ?a? indicates an 18-lead plastic dual in-line package with copper lead frame for optimum power dissipation. under normal operating conditions, these devices will sustain 120 ma continuously for each of the eight outputs at an ambient temperature of +50c and a supply of 15 v. the suffix ?lw? package is provided in a 20-pin wide-body soic package with improved thermal characteristics compared to the 18-pin soic version it replaces (100% pin-compatible electrically). the a2982elw driver is available for operation over an extended temperature range, down to -40c. these packages are lead (pb) free, with 100% matte-tin leadframe plating. 29310t features and benefits ? ttl, dtl, pmos, or cmos compatible inputs ? 500 ma output source current capability ? transient-protected outputs ? output breakdown voltage to 50 v ? dip or soic packaging 8-channel source drivers packages: simplified block diagrams not to scale 2981 and 2982 18-pin dip (package a) 20-pin soicw (package lw) (drop-in replacement for discon- tinued 18-pin soic variants) 18-pin dip (a package) (nc pins, 10 and 11, not present on discontinued 18-pin lw package) 20-pin soicw (lw package)
8-channel source drivers 2981 and 2982 2 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com selection guide part number package packing ambient temperature t a (c) a2982elwtr-t 1 20-pin soicw 1000 per reel ?40 to 85 a2982slwtr-t 20-pin soicw 1000 per reel ?20 to 85 udn2981a-t 2 18-pin dip 21 per tube UDN2982a-t 2 18-pin dip 21 per tube 1 variant is in production but has been determined to be last time buy. this classification indicates that the variant is obsolete and notice has been given. sale of the variant is currently restricted to existing customer applications. the variant should not be purchased for new design applications because of obsolescence in the near future. samples are no longer available. status date change november 2, 2009. deadline for receipt of last time buy orders is april 30, 2010. 2 variant is in production but has been determined to be last time buy. this classification indicates that the variant is obsolete and notice has been given. sale of the variant is currently restricted to existing customer applications. the variant should not be purchased for new design applications because of obsolescence in the near future. samples are no longer available. status date change january 30, 2012. deadline for receipt of last time buy orders is april 27, 2012. absolute maximum ratings characteristic symbol notes rating units output voltage range v ce 5 to 50 v input voltage v in udn2981 20 v a2982, UDN2982 20 v output current i out ?500 ma package power dissipation p d see graph ? ? operating ambient temperature t a range e ?40 to 85 oc range s ?20 to 85 oc maximum junction temperature t j (max) 150 oc storage temperature t stg ?55 to 150 oc 50 75 100 125 150 2.5 0.5 0 allowab le pa cka g epowe rd i s s ipation (w) ambient temperature c 2.0 1.5 1.0 25 18-pin dip, r ja =65 c/w 20-le ad s oic , r ja =90 c/w
8-channel source drivers 2981 and 2982 3 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com one of eight drivers typical electrosensitive printer application 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 10 in 1 in 2 in 3 in 4 in 5 in 6 in 7 in 8 v s r l r l r l r l r l r l r l r l 1 2 3 4 5 6 7 8 9 13 14 15 16 17 18 19 20 12 10 11 in 1 in 2 in 3 in 4 in 5 in 6 in 7 in 8 v nc nc s r l r l r l r l r l r l r l r l 18-pin dip (a package) 20-pin soicw (lw package) pins 10 and 11 can oat; other pins match discontinued 18-pin soic: 1 to 9 same, pins 12 to 20 match pins 10 to 18
8-channel source drivers 2981 and 2982 4 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com electrical characteristics 1,2 at t a = +25c (unless otherwise speci ed). 1 negative current is de ned as coming out of (sourcing) the speci ed device terminal. 2 all unused inputs must be connected to ground. pull-down resistors (approximately 10 k ) are recommended for inputs that are al- lowed to oat while power is being applied to v s . 3 all inputs simultaneously. 4 turn-off delay is in uenced by load conditions. systems applications well below the speci ed output loading may require timing con- siderations for some designs, i.e., multiplexed displays or when used in combination with sink drivers in a totem pole con guration. characteristic symbol variant test conditions test fig. min. typ. max. units output leakage current 3 i cex all v in = 0.4 v, v s = 50 v 1 ? ? 20 a output sustaining voltage v ce(sus) all i out = -45 ma ? 35 ? ? v collector-emitter saturation voltage v ce(sat) all v in = 2.4 v, i out = -100 ma 2 ? 1.6 1.8 v v in = 2.4 v, i out = -225 ma 2 ? 1.7 1.9 v v in = 2.4 v, i out = -350 ma 2 ? 1.8 2.0 v input current i in(on) 2981 v in = 2.4 v 3 ? 140 200 a v in = 3.85 v 3 ? 310 450 a 2982 v in = 2.4 v 3 ? 140 200 a v in = 12 v 3 ? 1.25 1.93 ma output source current (outputs open) l out 2981 v in = 2.4 v, v ce = 2.0 v 2 -350 ? ? ma 2982 v in = 2.4 v, v ce = 2.0 v 2 -350 ? ? ma supply current leakage current i s all v in = 2.4 v*, v s = 50 v 4 ? ? 10 ma clamp diode current i r all v r = 50 v, v in = 0.4 v* 5 ? ? 50 a clamp diode forward voltage v f all i f = 350 ma 6 ? 1.5 2.0 v turn-on delay t on all 0.5 e in to 0.5 e out , r l = 100 , v s = 35 v ? ? 0.3 2.0 s turn-off delay 4 t off all 0.5 e in to 0.5 e out , r l = 100 , v s = 35 v, see note ? ? 2.0 10 s
8-channel source drivers 2981 and 2982 5 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com test figures figure 1 figure 2 figure 3 dwg. no. a-11,083 dwg. no. a-11,084 dwg. no. a-11,085 v v in cex i s a v v v i out in ce s v ma open v v in in i s ma dwg. no. a-11,086 dwg. no. a-11,087 dwg. no. a-11,088 figure 5 figure 6 figure 4 open open v i f f v v s i r v in a v in i s s v open ma
8-channel source drivers 2981 and 2982 6 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com allowable peak collector current as a function of duty cycle udn2981a and UDN2982a 100 v = 15 v 8 7 6 4 5 number of outputs conducting simultaneously 90 80 70 60 50 40 30 20 10 0 0 50 100 150 200 250 300 350 400 450 500 recommended maximum output current allowable peak collector current in ma at 50 c per cent duty cycle s 3 100 v = 15 v 8 7 6 4 5 number of outputs conducting simultaneously 90 80 70 60 50 40 30 20 10 0 0 50 100 150 200 250 300 350 400 450 500 recommended maximum output current allowable peak collector current in ma at 70 c per cent duty cycle s 3 dwg. no. a-11,107b dwg. no. a-11,108b input current as a function of input voltage typical 2.5 input current, i (ma) in 2.0 1.5 1.0 0.5 2 4 6 8 10 12 input voltage (volts) maximum dwg. no. a-11,115b
8-channel source drivers 2981 and 2982 7 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com a package, 18-pin dip 5.33 max 0.46 0.12 22.86 0.51 6.35 +0.76 ?0.25 3.30 +0.51 ?0.38 10.92 +0.38 ?0.25 1.52 +0.25 ?0.38 7.62 2.54 0.25 +0.10 ?0.05 c seating plane 2 1 18 a dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown a terminal #1 mark area all dimensions nominal, not for tooling use (reference jedec ms-001 ac) dimensions in inches lw package, 20-pin soicw 2 1 20 2 1 20 a 2.65 max c seating plane c 0.10 20x a terminal #1 mark area gauge plane seating plane b 2.25 0.65 9.50 1.27 pcb layout reference view for reference only dimensions in millimeters (reference jedec ms-013 ac) dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown b reference pad layout (reference ipc soic127p1030x265-20m) all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances 1.27 0.25 0.20 0.10 0.41 0.10 12.800.20 10.300.33 7.500.10 4 4 0.27 +0.07 ?0.06 0.84 +0.44 ?0.43
8-channel source drivers 2981 and 2982 8 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com copyright ?1977-2011, allegro microsystems, inc. allegro microsystems, inc. reserves the right to make, from time to time, such departures from the detail speci cations as may be required to permit improvements in the performance, reliability, or manufacturability of its products. before placing an order, the user is cauti oned to verify that the information being relied upon is current. allegro?s products are not to be used in life support devices or systems, if a failure of an allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. the information included herein is believed to be accurate and reliable. however, allegro microsystems, inc. assumes no respon sibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. for the latest version of this document, visit our website: www.allegromicro.com revision history revision revision date description of revision rev. t januray 30, 2012 update product availability
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