Solder-Ready & In-Stock Alternatives for AMS1117-3.3
Factory-tested drop-in alternatives for EMS buyers and procurement teams facing allocation or extended lead times on AMS1117-3.3. Zero PCB redesign, competitive spot pricing matched to your target price, and 24–48h express dispatch from Shenzhen.
AMS1117-3.3 is the most common 1A linear regulator in prototype and industrial hardware. However, it requires a 1.1V dropout and consumes ~5–11mA quiescent current even at no load. For battery-powered or heat-sensitive designs, low-dropout, low-Iq alternatives like MicrOne ME6211 or Richtek RT9193 provide massive efficiency gains.
Solder-Ready Stock & Second-Source Alternatives
1A Output Current, Fixed 3.3V Output
Up to 15V Input, 1.1V Dropout at 1A
Passive regulator; zero software change.
Direct 1:1 drop-in on SOT-223 footprint. Pin 1: GND/ADJ, Pin 2: VOUT (Tab), Pin 3: VIN. Compatible with 10µF tantalum or ceramic output capacitors with series damping resistor.
World top 3 semiconductor packaging provider; extreme volume production stability.
500mA LDO, Ultra-low Quiescent Current: 40 µA (vs 5000 µA on 1117)
2.0V – 6.5V input, 100mV ultra-low dropout at 100mA
Enable pin can be tied to MCU GPIO for battery power cycling.
Requires SOT-23-5 footprint; 100% stable with ceramic 1µF–4.7µF MLCC capacitors (zero ESR oscillation).
Standard choice for handheld instruments, Bluetooth modules, and sensor nodes.
SMT Line & Procurement Qualification Checklist
- 1 Check output capacitor stability: legacy 1117 LDOs require a minimum ESR (0.2–1.0 ohm) and can oscillate with low-ESR ceramic capacitors unless a small series resistor is added. Modern LDOs like ME6211 are explicitly stable with pure ceramic MLCCs.
- 2 Calculate thermal dissipation: P_loss = (V_in - 3.3V) * I_load. Ensure SOT-223 tab copper thermal relief is sufficient for loads exceeding 300mA.
Quality & Authenticity Assurance
Every component supplied by ICBOMS undergoes 100% incoming optical external visual inspection (EVI) under 45x stereo magnification. Marking permanency is tested per IDEA-STD-1010-B / MIL-STD-883 Method 2015 solvent tests to prevent counterfeit or remarking risks.
Frequently Asked Questions
Q: Why does my AMS1117 get boiling hot when powered from a 12V supply?
A: Linear regulators drop excess voltage as pure heat. If you input 12V and draw 500mA at 3.3V, the AMS1117 dissipates (12V - 3.3V) * 0.5A = 4.35 Watts! In a SOT-223 package, that will trigger thermal shutdown within seconds. Consider using a pin-compatible DC-DC buck converter module or step down to 5V first.