Sure, both A33B5 and AMS1117-3.3 give you a steady 3.3V output—but that’s pretty much where the similarities end. When it comes to efficiency, size, and battery life, A33B5 is playing a whole different game.

If you’re designing something small, smart, and battery-powered, A33B5 might just be your new best friend.

Quick Spec Showdown

√ Coin Cell Devices
Tired of changing batteries every few months?
With AMS1117, your CR2032 might die in 3 months.
With A33B5? You're looking at up to 5 years. Seriously.

√ Smart Locks & Home Security
AMS1117 can choke on voltage spikes.
A33B5? It can handle up to 50V surges like a champ.

√ Passive RFID Tags
AMS1117’s 4mA idle current drains power fast.
A33B5 draws just 0.2μA—giving you longer range and longer life.

Common Questions Answered

Q: Why is AMS1117 making a weird noise?
A: It often needs tantalum or electrolytic caps. If you're using all-ceramic MLCCs, you might get noise or instability.

Q: Is 200mA too low for my project?
A: Unless you’re running a display or Wi-Fi, 200mA is plenty for sensors, BLE chips, and small MCUs.

Big Savings, Small Change

Let’s say you’re making 100,000 units:

• AMS1117 = ¥1.8/pc

• A33B5 = ¥0.25/pc
  → That’s ¥120,000+ saved, plus no battery swaps in the field.

Oh, and A33B5 is pin-to-pin compatible with AMS1117. In some cases, you can even cut 2 caps and free up PCB space.

What Engineers Are Saying

“Using AMS1117 is like holding onto a flip phone in 2025.”
— Smart Home Engineer