ITEM NAME/DESCRIPTION PART NO. BRAND
158 HEX INVERTERS WITH OPEN-COLLECTOR OUTPUTS CD54AC05F3A Texas Instruments
159 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin CDIP Tube CD54AC273F3A Texas Instruments
160 Flip Flop JK-Type Neg-Edge 2-Element 16-Pin CDIP Tube CD54ACT112F3A Texas Instruments
161 Latch Transparent 3-ST 8-CH D-Type 20-Pin CDIP Tube CD54ACT373F3A Texas Instruments
162 XOR Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54ACT86F3A Texas Instruments
163 NAND Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54HC00F Texas Instruments
164 NAND Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54HC00F3A Texas Instruments
165 NAND Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54HC03F Texas Instruments
166 NAND Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54HC03F3A Texas Instruments
167 Flip Flop JK-Type Neg-Edge 2-Element 16-Pin CDIP Tube CD54HC112F3A Texas Instruments
168 AND Gate 3-Element 3-IN CMOS 14-Pin CDIP Tube CD54HC11F Texas Instruments
169 Inverter Schmitt Trigger 6-Element CMOS 14-Pin CDIP Tube CD54HC14F Texas Instruments
170 NAND Gate 1-Element 8-IN CMOS 14-Pin CDIP Tube CD54HC30F Texas Instruments
171 Latch Transparent 3-ST 8-CH D-Type 20-Pin CDIP Tube CD54HC373F3A Texas Instruments
172 XNOR Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54HC7266F3A Texas Instruments
173 Flip Flop D-Type Pos-Edge 2-Element 14-Pin CDIP Tube CD54HC74F Texas Instruments
174 XOR Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54HC86F3A Texas Instruments
175 NAND Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54HCT00F Texas Instruments
176 NOR Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54HCT02F Texas Instruments
177 AND Gate 4-Element 2-IN CMOS 14-Pin CDIP Tube CD54HCT08F3A Texas Instruments
178 NAND Gate 3-Element 3-IN CMOS 14-Pin CDIP Tube CD54HCT10F3A Texas Instruments
179 Latch Addressable 8-CH D-Type 16-Pin CDIP Tube CD54HCT259F3A Texas Instruments
180 Latch Transparent 3-ST 8-CH D-Type 20-Pin CDIP Tube CD54HCT573F3A Texas Instruments
181 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin CDIP Tube CD54HCT574F3A Texas Instruments
182 NAND Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74AC00E Texas Instruments
183 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74AC00M Texas Instruments
184 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74AC00M96 Texas Instruments
185 NOR Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74AC02M96 Texas Instruments
186 Inverter 6-Element CMOS 14-Pin SOIC Tube CD74AC04M Texas Instruments
187 Inverter 6-Element CMOS 14-Pin SOIC T/R CD74AC04M96 Texas Instruments
188 HEX INVERTERS WITH OPEN-COLLECTOR OUTPUTS CD74AC05E Texas Instruments
189 Hex Inverters With Open-Collector Outputs CD74AC05M96 Texas Instruments
190 AND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74AC08M Texas Instruments
191 AND Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74AC08M96 Texas Instruments
192 Flip Flop JK# -Type Pos-Edge 2-Element 16-Pin SOIC T/R CD74AC109M96 Texas Instruments
193 NAND Gate 3-Element 3-IN CMOS 14-Pin PDIP Tube CD74AC10E Texas Instruments
194 Flip Flop JK-Type Neg-Edge 2-Element 16-Pin SOIC Tube CD74AC112M Texas Instruments
195 Flip Flop JK-Type Neg-Edge 2-Element 16-Pin SOIC T/R CD74AC112M96 Texas Instruments
196 Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC T/R CD74AC14M96 Texas Instruments
197 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 16-Pin PDIP Tube CD74AC174E Texas Instruments
198 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 16-Pin SOIC Tube CD74AC174M Texas Instruments
199 NAND Gate 2-Element 4-IN CMOS 14-Pin SOIC Tube CD74AC20M Texas Instruments
200 NAND Gate 2-Element 4-IN CMOS 14-Pin SOIC T/R CD74AC20M96 Texas Instruments
201 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin PDIP Tube CD74AC273E Texas Instruments
202 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin SOIC T/R CD74AC273M96 Texas Instruments
203 OR Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74AC32M96 Texas Instruments
204 Latch Transparent 3-ST 8-CH D-Type 20-Pin PDIP Tube CD74AC373E Texas Instruments
205 Latch Transparent 3-ST 8-CH D-Type 20-Pin SOIC Tube CD74AC373M Texas Instruments
206 Latch Transparent 3-ST 8-CH D-Type 20-Pin SOIC T/R CD74AC373M96 Texas Instruments
207 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin SOIC T/R CD74AC374M96 Texas Instruments
208 Latch Transparent 3-ST 8-CH D-Type 20-Pin PDIP Tube CD74AC573E Texas Instruments
209 Latch Transparent 3-ST 8-CH D-Type 20-Pin SOIC Tube CD74AC573M Texas Instruments
210 Flip Flop D-Type Pos-Edge 2-Element 14-Pin SOIC Tube CD74AC74M Texas Instruments
211 XOR Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74AC86M96E4 Texas Instruments
212 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74ACT00M Texas Instruments
213 NOR Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74ACT02M Texas Instruments
214 NOR Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74ACT02M96 Texas Instruments
215 Inverter 6-Element CMOS 14-Pin PDIP Tube CD74ACT04E Texas Instruments
216 Inverter 6-Element CMOS 14-Pin SOIC Tube CD74ACT04M Texas Instruments
217 Inverter 6-Element CMOS 14-Pin SOIC T/R CD74ACT04M96 Texas Instruments
218 Inverter 6-Element CMOS 14-Pin SOIC T/R CD74ACT05M96 Texas Instruments
219 AND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74ACT08M Texas Instruments
220 AND Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74ACT08M96 Texas Instruments
221 Flip Flop JK# -Type Pos-Edge 2-Element 16-Pin PDIP Tube CD74ACT109E Texas Instruments
222 Flip Flop JK# -Type Pos-Edge 2-Element 16-Pin SOIC T/R CD74ACT109M96 Texas Instruments
223 NAND Gate 3-Element 3-IN CMOS 14-Pin PDIP Tube CD74ACT10E Texas Instruments
224 Flip Flop JK-Type Neg-Edge 2-Element 16-Pin SOIC Tube CD74ACT112M Texas Instruments
225 Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube CD74ACT14M Texas Instruments
226 Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC T/R CD74ACT14M96 Texas Instruments
227 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin PDIP Tube CD74ACT273E Texas Instruments
228 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin SOIC Tube CD74ACT273M Texas Instruments
229 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin SOIC T/R CD74ACT273M96 Texas Instruments
230 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin TSSOP T/R CD74ACT273PWR Texas Instruments
231 OR Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74ACT32E Texas Instruments
232 OR Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74ACT32M Texas Instruments
233 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin PDIP Tube CD74ACT374E Texas Instruments
234 Latch Transparent 3-ST 8-CH D-Type 20-Pin PDIP Tube CD74ACT573E Texas Instruments
235 Latch Transparent 3-ST 8-CH D-Type 20-Pin SOIC Tube CD74ACT573M Texas Instruments
236 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin PDIP Tube CD74ACT574E Texas Instruments
237 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin SOIC Tube CD74ACT574M Texas Instruments
238 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin SOIC T/R CD74ACT574M96 Texas Instruments
239 Flip Flop D-Type Pos-Edge 2-Element 14-Pin PDIP Tube CD74ACT74E Texas Instruments
240 Flip Flop D-Type Pos-Edge 2-Element 14-Pin SOIC Tube CD74ACT74M Texas Instruments
241 Flip Flop D-Type Pos-Edge 2-Element 14-Pin SOIC T/R CD74ACT74M96 Texas Instruments
242 Flip Flop D-Type Pos-Edge 2-Element 14-Pin SOIC T/R CD74ACT74M96G4 Texas Instruments
243 NAND Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74HC00E Texas Instruments
244 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HC00M Texas Instruments
245 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HC00M96 Texas Instruments
246 NOR Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74HC02E Texas Instruments
247 NOR Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HC02M Texas Instruments
248 NOR Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HC02M96 Texas Instruments
249 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HC03M Texas Instruments
250 Inverter 6-Element CMOS 14-Pin SOIC T/R CD74HC04M96 Texas Instruments
251 AND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HC08M Texas Instruments
252 AND Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HC08M96 Texas Instruments
253 AND Gate 4-Element 2-IN CMOS 14-Pin TSSOP T/R CD74HC08PWR Texas Instruments
254 Flip Flop JK-Type Neg-Edge 2-Element 14-Pin SOIC T/R CD74HC107M96 Texas Instruments
255 NAND Gate 3-Element 3-IN CMOS 14-Pin SOIC Tube CD74HC10M Texas Instruments
256 Flip Flop JK-Type Neg-Edge 2-Element 16-Pin SOIC T/R CD74HC112M96 Texas Instruments
257 Flip Flop JK-Type Neg-Edge 2-Element 16-Pin TSSOP T/R CD74HC112PWR Texas Instruments
258 AND Gate 3-Element 3-IN CMOS 14-Pin SOIC Tube CD74HC11M Texas Instruments
259 AND Gate 3-Element 3-IN CMOS 14-Pin SOIC T/R CD74HC11M96 Texas Instruments
260 NAND Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74HC132E Texas Instruments
261 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HC132M Texas Instruments
262 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HC132M96 Texas Instruments
263 Inverter Schmitt Trigger 6-Element CMOS 14-Pin PDIP Tube CD74HC14E Texas Instruments
264 Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube CD74HC14M Texas Instruments
265 Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC T/R CD74HC14MT Texas Instruments
266 Inverter Schmitt Trigger 6-Element CMOS 14-Pin TSSOP T/R CD74HC14PWR Texas Instruments
267 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 16-Pin PDIP Tube CD74HC173E Texas Instruments
268 NAND Gate 2-Element 4-IN CMOS 14-Pin SOIC T/R CD74HC20M96 Texas Instruments
269 AND Gate 2-Element 4-IN CMOS 14-Pin PDIP Tube CD74HC21E Texas Instruments
270 AND Gate 2-Element 4-IN CMOS 14-Pin SOIC Tube CD74HC21M Texas Instruments
271 AND Gate 2-Element 4-IN CMOS 14-Pin SOIC T/R CD74HC21M96 Texas Instruments
272 Latch Addressable 8-CH D-Type 16-Pin SOIC Tube CD74HC259M Texas Instruments
273 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin PDIP Tube CD74HC273E Texas Instruments
274 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin SOIC Tube CD74HC273M Texas Instruments
275 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin SOIC T/R CD74HC273M96E4 Texas Instruments
276 NOR Gate 3-Element 3-IN CMOS 14-Pin PDIP Tube CD74HC27E Texas Instruments
277 NOR Gate 3-Element 3-IN CMOS 14-Pin SOIC Tube CD74HC27M Texas Instruments
278 NAND Gate 1-Element 8-IN CMOS 14-Pin PDIP Tube CD74HC30E Texas Instruments
279 NAND Gate 1-Element 8-IN CMOS 14-Pin SOIC Tube CD74HC30M Texas Instruments
280 NAND Gate 1-Element 8-IN CMOS 14-Pin SOIC T/R CD74HC30M96 Texas Instruments
281 NAND Gate 1-Element 8-IN CMOS 14-Pin SOP T/R CD74HC30NSR Texas Instruments
282 NAND Gate 1-Element 8-IN CMOS 14-Pin TSSOP Tube CD74HC30PW Texas Instruments
283 NAND Gate 1-Element 8-IN CMOS 14-Pin TSSOP T/R CD74HC30PWR Texas Instruments
284 OR Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74HC32E Texas Instruments
285 OR Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HC32M Texas Instruments
286 OR Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HC32M96 Texas Instruments
287 Latch Transparent 3-ST 8-CH D-Type 20-Pin SOIC T/R CD74HC373M96 Texas Instruments
288 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin PDIP Tube CD74HC374E Texas Instruments
289 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin SOIC T/R CD74HC374M96 Texas Instruments
290 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin SOIC T/R CD74HC374M96E4 Texas Instruments
291 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 20-Pin PDIP Tube CD74HC377E Texas Instruments
292 NOR Gate 2-Element 4-IN CMOS 14-Pin PDIP Tube CD74HC4002E Texas Instruments
293 NOR Gate 2-Element 4-IN CMOS 14-Pin SOIC Tube CD74HC4002M Texas Instruments
294 NOR Gate 2-Element 4-IN CMOS 14-Pin TSSOP T/R CD74HC4002PWR Texas Instruments
295 OR Gate 3-Element 3-IN CMOS 14-Pin PDIP Tube CD74HC4075E Texas Instruments
296 OR Gate 3-Element 3-IN CMOS 14-Pin SOIC Tube CD74HC4075M Texas Instruments
297 OR Gate 3-Element 3-IN CMOS 14-Pin SOP T/R CD74HC4075NSR Texas Instruments
298 OR Gate 3-Element 3-IN CMOS 14-Pin TSSOP T/R CD74HC4075PWR Texas Instruments
299 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin PDIP Tube CD74HC534E Texas Instruments
300 Latch Transparent 3-ST 8-CH D-Type 20-Pin PDIP Tube CD74HC563E Texas Instruments
301 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin PDIP Tube CD74HC564E Texas Instruments
302 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin SOIC T/R CD74HC564M96 Texas Instruments
303 Latch Transparent 3-ST 8-CH D-Type 20-Pin PDIP Tube CD74HC573E Texas Instruments
304 Latch Transparent 3-ST 8-CH D-Type 20-Pin SOIC Tube CD74HC573M Texas Instruments
305 Latch Transparent 3-ST 8-CH D-Type 20-Pin SOIC T/R CD74HC573M96 Texas Instruments
306 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 20-Pin PDIP Tube CD74HC574E Texas Instruments
307 XNOR Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HC7266M Texas Instruments
308 XNOR Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HC7266MT Texas Instruments
309 Flip Flop JK-Type Neg-Edge 2-Element 14-Pin PDIP Tube CD74HC73E Texas Instruments
310 Flip Flop JK-Type Neg-Edge 2-Element 14-Pin SOIC Tube CD74HC73M Texas Instruments
311 Flip Flop JK-Type Neg-Edge 2-Element 14-Pin SOIC T/R CD74HC73M96 Texas Instruments
312 Flip Flop D-Type Pos-Edge 2-Element 14-Pin PDIP Tube CD74HC74E Texas Instruments
313 Flip Flop D-Type Pos-Edge 2-Element 14-Pin SOIC Tube CD74HC74M Texas Instruments
314 Flip Flop D-Type Pos-Edge 2-Element 14-Pin SOIC T/R CD74HC74M96 Texas Instruments
315 Flip Flop D-Type Pos-Edge 2-Element 14-Pin SOIC T/R CD74HC74MT Texas Instruments
316 Latch Transparent 4-CH D-Type 16-Pin PDIP Tube CD74HC75E Texas Instruments
317 Latch Transparent 4-CH D-Type 16-Pin SOIC Tube CD74HC75M Texas Instruments
318 XOR Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HC86M96 Texas Instruments
319 NAND Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74HCT00E Texas Instruments
320 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HCT00M Texas Instruments
321 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HCT00M96 Texas Instruments
322 NOR Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74HCT02E Texas Instruments
323 NOR Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HCT02M Texas Instruments
324 NAND Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74HCT03E Texas Instruments
325 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HCT03M Texas Instruments
326 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HCT03M96 Texas Instruments
327 Inverter 6-Element CMOS 14-Pin PDIP Tube CD74HCT04E Texas Instruments
328 Inverter 6-Element CMOS 14-Pin SOIC Tube CD74HCT04M Texas Instruments
329 Inverter 6-Element CMOS 14-Pin SOIC T/R CD74HCT04M96 Texas Instruments
330 Inverter 6-Element CMOS 14-Pin TSSOP T/R CD74HCT04PWR Texas Instruments
331 AND Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74HCT08E Texas Instruments
332 AND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HCT08M Texas Instruments
333 Flip Flop JK# -Type Pos-Edge 2-Element 16-Pin SOIC T/R CD74HCT109M96 Texas Instruments
334 NAND Gate 3-Element 3-IN CMOS 14-Pin PDIP Tube CD74HCT10E Texas Instruments
335 NAND Gate 3-Element 3-IN CMOS 14-Pin SOIC T/R CD74HCT10M96 Texas Instruments
336 AND Gate 3-Element 3-IN CMOS 14-Pin SOIC Tube CD74HCT11M Texas Instruments
337 AND Gate 3-Element 3-IN CMOS 14-Pin SOIC T/R CD74HCT11M96 Texas Instruments
338 NAND Gate 4-Element 2-IN CMOS 14-Pin PDIP Tube CD74HCT132E Texas Instruments
339 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC Tube CD74HCT132M Texas Instruments
340 NAND Gate 4-Element 2-IN CMOS 14-Pin SOIC T/R CD74HCT132M96 Texas Instruments
341 Inverter Schmitt Trigger 6-Element CMOS 14-Pin PDIP Tube CD74HCT14E Texas Instruments
342 Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube CD74HCT14M Texas Instruments
343 Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC T/R CD74HCT14M96 Texas Instruments
344 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 16-Pin PDIP Tube CD74HCT173E Texas Instruments
345 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 16-Pin SOIC Tube CD74HCT173M Texas Instruments
346 Flip Flop D-Type Bus Interface Pos-Edge 3-ST 1-Element 16-Pin SOIC T/R CD74HCT173M96 Texas Instruments
347 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 16-Pin SOIC Tube CD74HCT174MG4 Texas Instruments
348 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 16-Pin PDIP Tube CD74HCT175E Texas Instruments
349 Flip Flop D-Type Bus Interface Pos-Edge 1-Element 16-Pin SOIC Tube CD74HCT175M Texas Instruments
350 NAND Gate 2-Element 4-IN CMOS 14-Pin PDIP Tube CD74HCT20E Texas Instruments