{"id":8032,"date":"2026-07-16T18:56:18","date_gmt":"2026-07-16T16:56:18","guid":{"rendered":"https:\/\/ataox.org\/blog\/projets-raspberry-pi\/etabli-du-debutant\/quelle-alimentation-pour-un-raspberry-pi\/"},"modified":"2026-07-16T18:56:18","modified_gmt":"2026-07-16T16:56:18","slug":"quelle-alimentation-pour-un-raspberry-pi","status":"publish","type":"post","link":"https:\/\/ataox.org\/blog\/projets-raspberry-pi\/etabli-du-debutant\/quelle-alimentation-pour-un-raspberry-pi\/","title":{"rendered":"Quelle alimentation pour un Raspberry Pi ?"},"content":{"rendered":"<p><strong>Le Raspberry Pi 5 demande une alimentation USB-C de 5,1 V \/ 5 A (27 W, norme USB-PD), le Pi 4 une USB-C de 5,1 V \/ 3 A (15 W), et les Pi 3 et mod\u00e8les ant\u00e9rieurs un bloc micro-USB de 5,1 V \/ 2,5 A.<\/strong> Ce sont les sp\u00e9cifications des blocs officiels de la fondation ; n&rsquo;importe quel bloc respectant ces valeurs convient.<\/p>\n<table>\n<thead>\n<tr>\n<th>Mod\u00e8le<\/th>\n<th>Connecteur<\/th>\n<th>Alimentation recommand\u00e9e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Raspberry Pi 5<\/td>\n<td>USB-C<\/td>\n<td>5,1 V \/ 5 A (27 W, USB-PD)<\/td>\n<\/tr>\n<tr>\n<td>Raspberry Pi 4 \/ 400<\/td>\n<td>USB-C<\/td>\n<td>5,1 V \/ 3 A (15 W)<\/td>\n<\/tr>\n<tr>\n<td>Raspberry Pi 3 \/ 3B+<\/td>\n<td>micro-USB<\/td>\n<td>5,1 V \/ 2,5 A<\/td>\n<\/tr>\n<tr>\n<td>Pi Zero \/ Zero 2 W<\/td>\n<td>micro-USB<\/td>\n<td>5 V \/ 1 \u00e0 2,5 A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Le bloc officiel du Pi 5 est un peu particulier : c&rsquo;est un chargeur USB-PD qui propose un mode hors norme de 5 V \u00e0 5 A. La plupart des chargeurs PD du commerce plafonnent \u00e0 5 V\/3 A : le Pi 5 fonctionne alors, mais limite le courant total fourni \u00e0 ses ports USB \u00e0 600 mA \u2014 un disque dur externe risque de ne pas d\u00e9marrer. Pour un Pi 5 utilis\u00e9 en bureau l\u00e9ger sans p\u00e9riph\u00e9riques gourmands, un bon bloc 5 V\/3 A reste n\u00e9anmoins utilisable.<\/p>\n<h2>Un chargeur de t\u00e9l\u00e9phone peut-il suffire ?<\/h2>\n<p>Parfois, mais c&rsquo;est la premi\u00e8re cause de pannes myst\u00e9rieuses. Beaucoup de chargeurs de smartphone ne d\u00e9livrent que 2 \u00e0 3 A en 5 V, et les chargeurs \u00ab charge rapide \u00bb privil\u00e9gient des tensions plus hautes (9 V, 12 V) que le Pi n&rsquo;exploite pas. Un Pi 5 branch\u00e9 sur un bloc trop faible d\u00e9marre, mais bride ses ports USB et affiche un avertissement de sous-tension.<\/p>\n<h2>Reconna\u00eetre une sous-alimentation<\/h2>\n<p>Les sympt\u00f4mes classiques : une ic\u00f4ne d&rsquo;\u00e9clair jaune \u00e0 l&rsquo;\u00e9cran, le message \u00ab low voltage warning \u00bb dans les journaux syst\u00e8me, des red\u00e9marrages al\u00e9atoires, des p\u00e9riph\u00e9riques USB qui se d\u00e9connectent ou une carte SD qui se corrompt. Si vous observez l&rsquo;un de ces signes, testez d&rsquo;abord un autre bloc d&rsquo;alimentation et un autre c\u00e2ble avant de soup\u00e7onner la carte : un c\u00e2ble USB-C trop fin fait chuter la tension m\u00eame avec un bon chargeur.<\/p>\n<details>\n<summary>Quelle alimentation pour un Raspberry Pi Zero W ?<\/summary>\n<p>Un simple bloc micro-USB 5 V \/ 1 A suffit dans la plupart des cas ; 2 A mettent \u00e0 l&rsquo;abri si vous branchez des p\u00e9riph\u00e9riques.<\/p>\n<\/details>\n<details>\n<summary>Peut-on alimenter un Raspberry Pi par les broches GPIO ?<\/summary>\n<p>C&rsquo;est possible (broches 5 V et masse) mais r\u00e9serv\u00e9 aux utilisateurs avertis : ce chemin contourne les protections de la prise d&rsquo;alimentation.<\/p>\n<\/details>\n<details>\n<summary>Existe-t-il une alimentation par c\u00e2ble r\u00e9seau (PoE) ?<\/summary>\n<p>Oui, avec un chapeau (HAT) PoE officiel sur Pi 4 et Pi 5, \u00e0 condition d&rsquo;avoir un commutateur r\u00e9seau compatible PoE.<\/p>\n<\/details>\n<h2>\u00c0 lire aussi<\/h2>\n<ul>\n<li><a href=\"https:\/\/ataox.org\/blog\/projets-raspberry-pi\/etabli-du-debutant\/debuter-en-electronique-materiel-budget-et-premiers-reperes\/\">D\u00e9buter en \u00e9lectronique : mat\u00e9riel, budget et premiers rep\u00e8res<\/a><\/li>\n<li><a href=\"https:\/\/ataox.org\/blog\/projets-raspberry-pi\/etabli-du-debutant\/combien-coute-un-raspberry-pi\/\">Combien co\u00fbte un Raspberry Pi ?<\/a><\/li>\n<li><a href=\"https:\/\/ataox.org\/blog\/projets-raspberry-pi\/etabli-du-debutant\/combien-consomme-un-raspberry-pi\/\">Combien consomme un Raspberry Pi ?<\/a><\/li>\n<li><a href=\"https:\/\/ataox.org\/blog\/projets-raspberry-pi\/etabli-du-debutant\/quelle-carte-sd-pour-un-raspberry-pi\/\">Quelle carte SD pour un Raspberry Pi ?<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":34,"featured_media":999999999,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"manual_indexmenow":false,"indexmenow_id_project":0,"footnotes":""},"categories":[4725],"tags":[],"class_list":["post-8032","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-etabli-du-debutant","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Quelle alimentation pour un Raspberry Pi ?<\/title>\n<meta name=\"description\" content=\"Le Raspberry Pi 5 demande une alimentation USB-C de 5,1 V \/ 5 A (27 W, norme USB-PD), le Pi 4 une USB-C de 5,1 V \/ 3 A (15 W), et les Pi 3 et mod\u00e8les\" 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