{"id":2148,"date":"2026-05-14T06:45:18","date_gmt":"2026-05-14T06:45:18","guid":{"rendered":"https:\/\/materialparts.com\/spx3819m5-l-5-0-tr\/"},"modified":"2026-05-14T06:45:18","modified_gmt":"2026-05-14T06:45:18","slug":"spx3819m5-l-5-0-tr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/spx3819m5-l-5-0-tr\/","title":{"rendered":"SPX3819M5-L-5-0\/TR"},"content":{"rendered":"

Productos<\/h2>\n

The SPX3819M5-L-5-0\/TR is a 500mA low-noise low-dropout (LDO) voltage regulator providing a fixed 5.0V output. Originally designed by Sipex\/Exar (now MaxLinear), it features ultra-low quiescent current of 90\u00b5A, low dropout of 340mV at full load, and output noise as low as 40\u00b5VRMS with a bypass capacitor. The device includes reverse battery protection, current limiting, thermal shutdown, and a logic-compatible enable pin, housed in a compact SOT-23-5 package.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Fabricante<\/td>\nMaxLinear (Sipex\/Exar)<\/td>\n<\/tr>\n
Output Voltage<\/td>\n5.0V (Fixed)<\/td>\n<\/tr>\n
Maximum Output Current<\/td>\n500mA<\/td>\n<\/tr>\n
Input Voltage Range<\/td>\n2.5V to 16V<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n340mV @ 500mA<\/td>\n<\/tr>\n
Corriente de reposo<\/td>\n90\u00b5A typical @ 100mA load<\/td>\n<\/tr>\n
PSRR<\/td>\n70dB<\/td>\n<\/tr>\n
Output Noise<\/td>\n40\u00b5VRMS with BYP capacitor<\/td>\n<\/tr>\n
Output Accuracy<\/td>\n\u00b11%<\/td>\n<\/tr>\n
Current Limit<\/td>\n800mA typical<\/td>\n<\/tr>\n
Enable Input<\/td>\nLogic compatible (VIH > 2V, VIL < 0.4V)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
Paquete<\/td>\nSOT-23-5<\/td>\n<\/tr>\n
Budgetary Price<\/td>\n$0.11 @ 1ku<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Low dropout: 340mV at 500mA full load<\/li>\n
  • Ultra-low quiescent current: 90\u00b5A at 100mA load<\/li>\n
  • Very low noise: 40\u00b5VRMS (10Hz-100kHz) with bypass capacitor<\/li>\n
  • High output accuracy: \u00b11%<\/li>\n
  • Logic-compatible enable pin with zero off-mode current<\/li>\n
  • Reverse battery protection<\/li>\n
  • Current limit and thermal shutdown<\/li>\n
  • 70dB PSRR for excellent ripple rejection<\/li>\n
  • Available in SOT-23-5, nSOIC-8, and DFN-8 packages<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Battery-powered portable devices<\/li>\n
    • Cordless phones and radio control systems<\/li>\n
    • Portable and notebook computers<\/li>\n
    • Post-regulation for switching converters<\/li>\n
    • Low-noise analog and sensor circuits<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SPX3819M5-L-5-0\/TR is a 500mA low-noise low-dropout (LDO) voltage regulator providing a fixed 5.0V output. Originally designed by Sipex\/Exar (now MaxLinear), it features ultra-low quiescent current of 90\u00b5A, low dropout of 340mV at full load, and output noise as low as 40\u00b5VRMS with a bypass capacitor. The device includes reverse battery protection, current […]<\/p>\n","protected":false},"author":2,"featured_media":2173,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[26,13],"tags":[],"chip_brand":[171],"class_list":["post-2148","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-digital-signal-processors-dsp","category-integrated-circuits-ics","chip_brand-maxlinear"],"acf":{"brief_explanation":"500mA LDO, fixed 5.0V, 340mV dropout, 40\u00b5VRMS noise, 90\u00b5A Iq, SOT-23-5, enable pin","date_code":"","package_case":"SOT-23-5 (SC-74A, SOT-753)","in_stock":5600,"datasheet":"https:\/\/www.maxlinear.com\/product\/power-management\/ldo\/SPX3819","price":"$0.11 @ 1ku","product_introduction":"The SPX3819M5-L-5-0\/TR is a 500mA low-noise low-dropout voltage regulator from MaxLinear's SPX3819 family, providing a fixed 5.0V output with \u00b11% accuracy. Originally designed by Sipex Corporation (later Exar, now MaxLinear), the device features a low dropout voltage of 340mV at full 500mA load and ultra-low quiescent current of 90\u00b5A at 100mA output. A reference bypass pin (BYP) enables output noise as low as 40\u00b5VRMS when used with an external capacitor, making it suitable for noise-sensitive analog and RF applications. The logic-compatible enable pin allows the regulator to be switched off, reducing power consumption to near zero. Comprehensive protection includes reverse battery protection, current limiting (800mA typical), and thermal shutdown. The SOT-23-5 package provides a compact footprint for space-constrained designs.","working_principle":"

      Regulation Loop<\/h3>\n

      The SPX3819 uses a PMOS pass transistor driven by an error amplifier that compares the output voltage (via an internal resistor divider for fixed-voltage versions) with an internal bandgap reference. The PMOS topology enables low dropout operation since the pass element operates as a variable resistor rather than a constant-current source, minimizing the voltage differential required between input and output.<\/p>\n\n

      Enable and Shutdown<\/h3>\n

      The EN pin provides logic-level on\/off control. When EN is above 2.0V, the regulator is enabled. When EN is below 0.4V, the pass transistor is turned off and ground current drops to near zero, effectively disabling the output. This enables power sequencing and battery conservation in portable systems.<\/p>\n\n

      Noise Reduction via Bypass<\/h3>\n

      The BYP pin connects to the internal bandgap reference through a high-impedance node. A 10nF capacitor from BYP to GND filters reference noise, reducing output noise from 300\u00b5VRMS to 40\u00b5VRMS (10Hz-100kHz). The capacitor also slows the output ramp-up rate, which may be beneficial or detrimental depending on the application's startup timing requirements.<\/p>\n\n

      Protection Mechanisms<\/h3>\n

      Current limiting activates at approximately 800mA, protecting the device and downstream circuitry from short-circuit faults. Thermal shutdown disables the output when the junction temperature exceeds approximately 160\u00b0C. Reverse battery protection prevents damage when the input polarity is reversed.<\/p>","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>EN<\/td>Input<\/td>Enable input (active high, VIH > 2V, VIL < 0.4V)<\/td><\/tr>\n
      2<\/td>GND<\/td>Ground<\/td>Ground connection<\/td><\/tr>\n
      3<\/td>IN<\/td>Input<\/td>Supply voltage input (2.5V to 16V)<\/td><\/tr>\n
      4<\/td>BYP\/ADJ<\/td>Input<\/td>Reference bypass for noise reduction (fixed versions) \/ adjust for adjustable versions<\/td><\/tr>\n
      5<\/td>OUT<\/td>Output<\/td>Regulated 5.0V output<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Battery-powered portable devices requiring efficient 5V regulation with minimal dropout and ultra-low quiescent current<\/li>\n
      • Low-noise sensor and analog circuits where BYP capacitor reduces output noise to 40\u00b5VRMS<\/li>\n
      • Cordless phones and radio control systems needing reverse battery protection and enable-controlled power<\/li>\n
      • Post-regulation for switching converters leveraging 70dB PSRR to suppress switching ripple<\/li>\n
      • Embedded systems with power sequencing using the enable pin for controlled startup order<\/li>\n<\/ul>","alternative_models":"\n
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>\n
        MaxLinear<\/td>SPX3819M5-L-3-3\/TR<\/td>SOT-23-5<\/td>Same series, 3.3V fixed output variant<\/td><\/tr>\n
        MaxLinear<\/td>SPX3819M5-L-1-8<\/td>SOT-23-5<\/td>Same series, 1.8V fixed output variant<\/td><\/tr>\n
        Microchip<\/td>MIC5219-5.0YM5-TR<\/td>SOT-23-5<\/td>Pin-compatible, 500mA, 5.0V, similar dropout<\/td><\/tr>\n
        TI<\/td>TLV70050DBVR<\/td>SOT-23-5<\/td>200mA, 5.0V, very low Iq, lower current<\/td><\/tr>\n
        Diodes Inc<\/td>AP2112K-5.0<\/td>SOT-23-5<\/td>600mA, 5.0V, lower dropout alternative<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/2148","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=2148"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/2148\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media\/2173"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=2148"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=2148"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=2148"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=2148"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}