{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CD4521BMT","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CD4521BMT","canonicalUrl":"https://icboms.com/texas-instruments/CD4521BMT","factsUrl":"https://icboms.com/api/mcp/products/CD4521BMT","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments CD4521BMT, 4000B series, 24-stage divide-by-2 frequency divider, 13 MHz max count rate, 3 V to 18 V supply, negative-edge triggered, asynchronous reset, -55°C to 125°C, 16-SOIC.","salesMarkdown":"## 24-stage divide-by-2 frequency divider for timing and clock division The Texas Instruments CD4521BMT is a 24-stage divide-by-2 frequency divider from the 4000B series, packaged in a 16-SOIC surface-mount package. It accepts a negative-edge clock input and provides a divided output, with an asynchronous reset to clear the internal counter. The supply range is 3 V to 18 V and the temperature range is -55°C to 125°C. ## 13 MHz count rate — what it means for the timing budget The 13 MHz maximum count rate defines the highest input clock frequency the CD4521BMT can reliably divide. For a 24-stage divider, the output frequency is the input divided by 2^24. ## Asynchronous reset — no clock needed to clear The reset is asynchronous, meaning asserting the reset pin immediately clears all 24 stages regardless of the clock state. This is useful for power-on initialization or emergency reset without waiting for a clock edge. No pull-up or pull-down is required on the reset pin if driven by a logic output; an open-drain or mechanical switch needs an external resistor to VDD or VSS to avoid floating. ## Supply range and temperature grade — deployment context The supply range is 3 V to 18 V, typical of 4000B CMOS logic. The operating temperature range is -55°C to 125°C. The 16-SOIC package is a standard surface-mount footprint.","metaTitle":"CD4521BMT 24-Stage Frequency Divider, 13 MHz, 16-SOIC","metaDescription":"TI CD4521BMT 24-stage divide-by-2 frequency divider, 13 MHz count rate, 3 V to 18 V supply, -55°C to 125°C, 16-SOIC. Active, ROHS3.","metaKeywords":null},"attributes":{"series":"4000B","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Reset":"Asynchronous","Series":"4000B","Package":"Tape & Reel (TR); Cut Tape (CT)","Count Rate":"13 MHz","Logic Type":"Divide-by-2","Trigger Type":"Negative Edge","Mounting Type":"Surface Mount","Package / Case":"16-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"3 V ~ 18 V","Number of Elements":"1","Operating Temperature":"-55°C ~ 125°C","Supplier Device Package":"16-SOIC","Number of Bits per Element":"24"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.17","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.17000","currency":"USD"},{"qty":10,"price":"$1.04400","currency":"USD"},{"qty":25,"price":"$0.99120","currency":"USD"},{"qty":100,"price":"$0.81430","currency":"USD"},{"qty":250,"price":"$0.76120","currency":"USD"},{"qty":500,"price":"$0.67268","currency":"USD"},{"qty":1250,"price":"$0.53106","currency":"USD"},{"qty":2500,"price":"$0.50100","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/f54e0ad2947d1c44a2df9fa0c49a8c3f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the equivalent or alternative for CD4521BMT?","answer":"The CD4521BMT is a 24-stage divider; a close functional alternative is the CD74HCT390E, which is a dual decade counter from the 74HCT series with a 27 MHz count rate, but it offers only 4 bits per element and is through-hole (DIP) rather than surface-mount. For a surface-mount 24-stage divider, the CD4521BMT is the direct choice — no pin-compatible second source is listed."},{"question":"Can CD4521BMT replace CD4521BE?","answer":"The CD4521BMT is the surface-mount (SOIC) variant of the CD4521BE, which is the through-hole (DIP) version. Functionally they are identical — same 24-stage divide-by-2 logic, same supply range and temperature grade. The BMT can replace the BE only if the board footprint accommodates SOIC instead of DIP."},{"question":"What is CD4521BMT's listed reset type?","answer":"The reset is asynchronous, meaning the counter clears immediately when the reset pin is asserted, independent of the clock signal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CD4521BMT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CD4521BMT when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T10:39:33.080Z","lastPublished":"2026-07-16T10:39:33.080Z","indexable":true}}