This non-isolated DC\/DC buck-boost converter is widely used as the DC-Converter 257LE and its 24V output at 12.5A typical short circuit current is used for stabilization of a 24V onboard power grid. The L-Version as 257LE-24-SD is designed to start up at about 9.5VDC and to step up the input voltage between 8V and 35V uncompromising to 24VDC. Its undervoltage lockout is 8VDC typical! Hence, supercapacitor powered electrical systems can be discharged to very low values or 12V battery systems can be regulated to 24V appropriately. Customer specific modifications as follows can be realized: 12V output, 13.8V output, 27V output, 36V output up to 55V output.<\/p>\n","protected":false},"excerpt":{"rendered":"
The 257LE-24-SD by Demke Electronic is a non-isolated DC\/DC buck-boost converter for a nominal input voltage of 24 VDC. It operates across an input voltage range of 9.50 to 35 VDC and delivers 24 VDC at up to 12.50 A, equivalent to 300 W of output power. Efficiency reaches up to98% at nominal input voltage and full load.<\/p>\n","protected":false},"featured_media":8240,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[93],"product_tag":[],"product_application":[112,111,147,97,148,110,95,102],"product_standard":[146,140,138,144,126,130,136,132,122,120,118,134,142],"class_list":["post-8239","product","type-product","status-publish","has-post-thumbnail","product_cat-dc-dc-auf-abwaertswandler","first","instock","shipping-taxable","product-type-simple"],"acf":{"vin_min":9.5,"vin_max":35,"vin_nom":24,"vin_peak":37,"efficiency_max":98,"vout":24,"iout":12.5,"pout":300,"output_configuration":"single","em_filter":"input_output","switching_frequency":120,"max_capacitive_load":"infinite","shutdown_voltage_min":-0.2,"shutdown_voltage_max":2.8,"enable_voltage_min":0,"enable_voltage_max":0,"switch_high_voltage_min":0,"switch_high_voltage_max":0,"mounting":"wall","connection_type":"Flachstecker","plug_pin_diameter":"","cable_lengths":"","produktstatus":"mts","temp_min":-40,"temp_max":85,"thermal_shutdown_temp":90,"ip_rating":"","mtbf":"","technical_features":["cc_cv","parallel","decoupling_diode","no_load_short_circuit","emi_input_output","no_derating","input_low_ripple_noise","wide_input"],"remote_control":false,"isolation_type":"non_isolated","potting":false,"certifications":["reach","rohs","ce"],"datasheet_de":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.003_DB.pdf","datasheet_en":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.003_DB_EN.pdf","drawing":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.003_TZ.pdf","safety_instructions":"https:\/\/demke-electronic.com\/wp-content\/uploads\/257.003_SI.pdf","step":"","download_base":"257.003","step_model":"size_90x90x26","pim_id":"237979000000156811","web_visible":true,"sync_status":"success","last_sync":"2026-09-01 08:45:52","successor_sku":"","alternative_skus":"","h1_de":"257LE-24-SD | DC\/DC buck-boost converter 24 VDC to 24 VDC, 300 W","h1_en":"257LE-24-SD | DC\/DC buck-boost converter 24 VDC to 24 VDC, 300 W"},"_links":{"self":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product\/8239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/media\/8240"}],"wp:attachment":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/media?parent=8239"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_brand?post=8239"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_cat?post=8239"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_tag?post=8239"},{"taxonomy":"product_application","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_application?post=8239"},{"taxonomy":"product_standard","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_standard?post=8239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}