销售商 | 型号 | 制造商 | 功能描述 | 价格 |
 Avnet Express | SN54LS21J | Texas Instruments | DUAL 4-INPUT AND GATE - Rail/Tube | 499 : $7.5489 999 : $7.346
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 Quest Components | SN54LS21J | Texas Instruments | Logic Circuit, Dual 4-Input AND, LS-TTL, 14 Pin, Ceramic, DIP | 2 : $6.44 1 : $9.66
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 Quest Components | SN54LS21J | Raytheon | Logic Circuit, Dual 4-Input AND, LS-TTL, 14 Pin, Ceramic, DIP | 9 : $2.25 3 : $3.0 1 : $4.5
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 Quest Components | SN54LS21J | Texas Instruments | Logic Circuit, Dual 4-Input AND, LS-TTL, 14 Pin, Ceramic, DIP | 34 : $5.6 4 : $6.0 1 : $12.0
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 Rochester Electronics | SN54LS21J | Texas Instruments | N/A | 500 : $6.89 1,000 : $6.55
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 Rochester Electronics | SN54LS21J | Rochester Electronics LLC | AND SN54LS21J | 价格未公开 |