{"id":853,"date":"2025-09-08T16:23:07","date_gmt":"2025-09-08T08:23:07","guid":{"rendered":"https:\/\/www.fairply.com\/blog\/?post_type=product&#038;p=853"},"modified":"2025-09-08T16:32:06","modified_gmt":"2025-09-08T08:32:06","slug":"epson-rtc72421-real-time-clock-module","status":"publish","type":"product","link":"https:\/\/www.fairply.com\/blog\/product\/epson-rtc72421-real-time-clock-module\/","title":{"rendered":"EPSON RTC72421\/RTC72423(REAL TIME CLOCK MODULE)"},"content":{"rendered":"<p><span style=\"color: #0000ff;\">\u6700\u5c0f\u5305\u88dd\u6578: 25\u00a0 \u00a0\/\u00a0 MOQ: 1000\u00a0 \/\u00a0 \u5305\u88dd\u65b9\u5f0f : \u7ba1\u88dd<\/span><\/p>\n<p>REAL TIME CLOCK MODULE (4-bit)<br \/>\n\u54c1\u724c : SEIKO EPSON Corporation<br \/>\n<span style=\"color: #008080;\">\u5c3a\u5bf8 \/ \u5c01\u88dd<\/span><\/p>\n<p>RTC-72421 : 23.1&#215;6.3mm (DIP-18pin)<br \/>\nRTC-72423 : 16.3&#215;7.9&#215;2.8mm(SOP-24pin)<\/p>\n<p><span style=\"color: #008080;\">Product Number<\/span><br \/>\nRTC-72421A : Q42724212000100 (\u00b110%)<br \/>\nRTC-72421B : Q42724212000200 (\u00b150%)<br \/>\nRTC-72423A : Q42724232000600 (\u00b120%)<br \/>\nRTC-72423B : Q42724232000700 (\u00b150%)<\/p>\n<hr \/>\n<p data-wp-editing=\"1\"><style id=\"wpforms-css-vars-765\">\n\t\t\t\t#wpforms-765 {\n\t\t\t\t--wpforms-container-padding: 0px;\n--wpforms-container-border-width: 1px;\n--wpforms-container-border-radius: 3px;\n--wpforms-background-color: rgba(0, 0, 0, 0);\n--wpforms-field-size-input-height: 43px;\n--wpforms-field-size-input-spacing: 15px;\n--wpforms-field-size-font-size: 16px;\n--wpforms-field-size-line-height: 19px;\n--wpforms-field-size-padding-h: 14px;\n--wpforms-field-size-checkbox-size: 16px;\n--wpforms-field-size-sublabel-spacing: 5px;\n--wpforms-field-size-icon-size: 1;\n--wpforms-label-size-font-size: 16px;\n--wpforms-label-size-line-height: 19px;\n--wpforms-label-size-sublabel-font-size: 14px;\n--wpforms-label-size-sublabel-line-height: 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class=\"wpforms-required-label\" aria-hidden=\"true\">*<\/span><\/label><textarea id=\"wpforms-765-field_3\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][3]\" aria-errormessage=\"wpforms-765-field_3-error\" required><\/textarea><\/div><script>\n\t\t\t\t( function() {\n\t\t\t\t\tconst style = document.createElement( 'style' );\n\t\t\t\t\tstyle.appendChild( document.createTextNode( '#wpforms-765-field_4-container { position: absolute !important; overflow: hidden !important; display: inline !important; height: 1px !important; width: 1px !important; z-index: -1000 !important; padding: 0 !important; } #wpforms-765-field_4-container input { visibility: hidden; } #wpforms-conversational-form-page #wpforms-765-field_4-container label { counter-increment: none; }' ) );\n\t\t\t\t\tdocument.head.appendChild( style );\n\t\t\t\t\tdocument.currentScript?.remove();\n\t\t\t\t} )();\n\t\t\t<\/script><\/div><!-- .wpforms-field-container --><div class=\"wpforms-submit-container\" ><input type=\"hidden\" name=\"wpforms[id]\" value=\"765\"><input type=\"hidden\" name=\"page_title\" value=\"\"><input type=\"hidden\" name=\"page_url\" value=\"https:\/\/www.fairply.com\/blog\/wp-json\/wp\/v2\/product\/853\"><input type=\"hidden\" name=\"url_referer\" value=\"\"><button type=\"submit\" name=\"wpforms[submit]\" id=\"wpforms-submit-765\" class=\"wpforms-submit\" data-alt-text=\"Sending...\" data-submit-text=\"\u9001\u51fa(Submit)\" aria-live=\"assertive\" value=\"wpforms-submit\">\u9001\u51fa(Submit)<\/button><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.fairply.com\/blog\/wp-content\/plugins\/wpforms-lite\/assets\/images\/submit-spin.svg\" class=\"wpforms-submit-spinner\" style=\"display: none;\" width=\"26\" height=\"26\" alt=\"Loading\"><\/div><\/form><\/div>  <!-- .wpforms-container --><\/p>\n","protected":false},"excerpt":{"rendered":"<p><span style=\"color: #0000ff;\"><strong>Overview<\/strong><\/span><\/p>\n<p>The RTC-72421\/RTC-72423 module is a real time clock that can be connected directly to a microprocessor&#8217;s bus. Its built-in crystal unit enables highly accurate time-keeping with no physical access required for adjustment and, since there is no need to connect external components, mounting and other costs can be reduced.<br \/>\nIn addition to its time and calendar functions, the RTC-72421\/RTC-72423 enables the use of 30-seconds correction and fixedperiod interrupt functions.<br \/>\nThe RTC-72421\/RTC-72423 module is ideally suited for applications requiring timing management, such as personal computers, dedicated word-processors, fax machines, multi-function telephones, and sequencers.<\/p>\n<p><strong><span style=\"color: #0000ff;\">FEATURES<\/span><\/strong><br \/>\n\u2027 Built-in crystal unit allows adjustment-free efficient operation.<br \/>\n\u2027 24 h \/12 h changeable and leap year automatically adjustable (Gregorian calendar). Note<br \/>\n\u2027 7242series does not have complete compatibility ability for the &#8220;old product RTC-6242 series\u201d.<br \/>\n\u2027 when replace to 7242series from 6242 series, confirm the technical information of RTC7242 latest manual by all means.<\/p>\n","protected":false},"featured_media":697,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[40],"product_cat":[38],"product_tag":[],"class_list":{"0":"post-853","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-epson","7":"product_cat-38","9":"first","10":"instock","11":"taxable","12":"shipping-taxable","13":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>EPSON RTC72421\/RTC72423(REAL TIME CLOCK MODULE) - FAIRPLY ENTERPRISES INC.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fairply.com\/blog\/product\/epson-rtc72421-real-time-clock-module\/\" \/>\n<meta property=\"og:locale\" content=\"zh_TW\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"EPSON RTC72421\/RTC72423(REAL TIME CLOCK MODULE) - FAIRPLY ENTERPRISES INC.\" \/>\n<meta property=\"og:description\" content=\"Overview  The RTC-72421\/RTC-72423 module is a real time clock that can be connected directly to a microprocessor&#039;s bus. Its built-in crystal unit enables highly accurate time-keeping with no physical access required for adjustment and, since there is no need to connect external components, mounting and other costs can be reduced. In addition to its time and calendar functions, the RTC-72421\/RTC-72423 enables the use of 30-seconds correction and fixedperiod interrupt functions. The RTC-72421\/RTC-72423 module is ideally suited for applications requiring timing management, such as personal computers, dedicated word-processors, fax machines, multi-function telephones, and sequencers.  FEATURES \u2027 Built-in crystal unit allows adjustment-free efficient operation. \u2027 24 h \/12 h changeable and leap year automatically adjustable (Gregorian calendar). Note \u2027 7242series does not have complete compatibility ability for the &quot;old product RTC-6242 series\u201d. \u2027 when replace to 7242series from 6242 series, confirm the technical information of RTC7242 latest manual by all means.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fairply.com\/blog\/product\/epson-rtc72421-real-time-clock-module\/\" \/>\n<meta property=\"og:site_name\" content=\"FAIRPLY ENTERPRISES INC.\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/FAIRPLYCOM?rdid=1L9xcIhAsMLmUOyL&amp;share_url=https3A2F2Fwww.facebook.com2Fshare2F1MARHsfDVM2F#\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-08T08:32:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.fairply.com\/blog\/wp-content\/uploads\/2025\/08\/RTC72421.png\" \/>\n\t<meta property=\"og:image:width\" content=\"700\" \/>\n\t<meta property=\"og:image:height\" content=\"700\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u9810\u4f30\u95b1\u8b80\u6642\u9593\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 \u5206\u9418\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.fairply.com\\\/blog\\\/product\\\/epson-rtc72421-real-time-clock-module\\\/\",\"url\":\"https:\\\/\\\/www.fairply.com\\\/blog\\\/product\\\/epson-rtc72421-real-time-clock-module\\\/\",\"name\":\"EPSON RTC72421\\\/RTC72423(REAL TIME CLOCK MODULE) - 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FAIRPLY ENTERPRISES INC.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.fairply.com\/blog\/product\/epson-rtc72421-real-time-clock-module\/","og_locale":"zh_TW","og_type":"article","og_title":"EPSON RTC72421\/RTC72423(REAL TIME CLOCK MODULE) - FAIRPLY ENTERPRISES INC.","og_description":"Overview  The RTC-72421\/RTC-72423 module is a real time clock that can be connected directly to a microprocessor's bus. Its built-in crystal unit enables highly accurate time-keeping with no physical access required for adjustment and, since there is no need to connect external components, mounting and other costs can be reduced. In addition to its time and calendar functions, the RTC-72421\/RTC-72423 enables the use of 30-seconds correction and fixedperiod interrupt functions. The RTC-72421\/RTC-72423 module is ideally suited for applications requiring timing management, such as personal computers, dedicated word-processors, fax machines, multi-function telephones, and sequencers.  FEATURES \u2027 Built-in crystal unit allows adjustment-free efficient operation. \u2027 24 h \/12 h changeable and leap year automatically adjustable (Gregorian calendar). 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