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Advanced Monolithic Systems Components
4 part numbers available · Sourced from Advanced Monolithic Systems authorized distribution · C-of-C and lot traceability on every shipment
Founded: 1998 · HQ: Shenzhen, China (R&D in Silicon Valley, USA)
Advanced Monolithic Systems (AMS) is a Chinese-American joint venture semiconductor company specializing in power management ICs, headquartered in Shenzhen with R&D operations in Silicon Valley. Founded in the late 1990s, AMS became globally known through the AMS1117 family of low-dropout voltage regulators — a pin-compatible second source to National Semiconductor's (now TI's) LM1117 that offers equivalent electrical performance at significantly lower cost. The AMS1117-3.3 is the default 3.3 V post-regulator on virtually every ESP8266/ESP32 development board, Arduino clone and router modem manufactured in Asia, with annual shipments in the hundreds of millions. Our Shenzhen warehouse stocks AMS1117-3.3 from AMS authorized channel, with output voltage and dropout verification on every lot.
Available Advanced Monolithic Systems Parts
Sourcing from Advanced Monolithic Systems – FAQ
Is AMS1117 the same as LM1117?
Electrically and pin-out identical — AMS1117 is a direct second source to National Semiconductor's LM1117 (now TI). Both are 1 A, low-dropout, positive voltage regulators in SOT-223 with the same GND-Vout-Vin pinout. AMS1117 is significantly cheaper and widely used in Asia; LM1117 has tighter spec guarantees and broader temperature range from TI.
Why does my AMS1117 get very hot?
Linear regulators dissipate (Vin − Vout) × Iout as heat. At 5 V in, 3.3 V out, 800 mA load, that is 1.36 W. In SOT-223 with 60 °C/W junction-to-ambient, the junction rises 82 °C above ambient. Add a copper pour under the tab pin with thermal vias to inner layers, or switch to a buck converter (TPS54331) for higher currents.
Can I use AMS1117-3.3 with a 12 V input?
Electrically yes — input range goes to 15 V nominal, 20 V absolute max. But thermally no: at 12 V in / 3.3 V out and 500 mA, you dissipate 4.35 W, far beyond what SOT-223 can handle without a large heatsink. Use a switching regulator like LM2596 or TPS54331 for 12 V-to-3.3 V conversion.
What is AMS's lead time?
AMS authorized channel ships in 2-4 weeks, which is among the shortest of any vendor we stock due to AMS's Shenzhen-based production. Our warehouse typically holds 50,000+ pcs of AMS1117-3.3 for same-day shipment.
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