| 54FCT521BDB | | part details | | IDT | | 9526 | | Avail | | 31 |
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| 54FCT521TLB | | part details | | Integrated Device Technol | | 9607 | | Avail | | 20 |
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| 54FCT521TEB | | part details | | IDT | | | Avail | | 12 |
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| 54FCT521DMQB | | part details | | NSC | | | Avail | | 10 |
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| 54FCT521CTDB | | part details | | IDT | | 9802 | | Avail | | 9 |
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| 54FCT521ALB | | part details | | IDT | | | Avail | | 8 |
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| 54FCT521LMQB/C | | part details | | 5962-88543012A | | | Avail | | 8 |
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| 54FCT521ATLB | | part details | | IDT | | 9733 | | Avail | | 7 |
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| 54FCT521TLB | | part details | | IDT | | 9607 | | Avail | | 7 |
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| 54FCT521DMQB | | part details | | N | | N/A | | Avail | | 4 |
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| 54FCT521ATDB | | part details | | IDT | | 9802 | | Avail | | 3 |
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| 54FCT521ADB | | part details | | ITD | | | Avail | | 3 |
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