power management pmic

AMS1117

Full part number: AMS1117-3.3

Every spec below is cited to the manufacturer datasheet. Compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the AMS1117 does

The AMS1117 is a 1A low dropout voltage regulator available in fixed and adjustable versions across SOT-223, TO-252, and SOT-89 packages. It features a typical 1.2V dropout at full load, supports input voltages up to 18V, and operates from -40°C to 125°C. The part includes thermal shutdown and current limiting protection. Fixed output versions offer 2% accuracy while adjustable versions provide 1.5% precision. Designers typically use this regulator in battery-powered systems, portable instrumentation, and as a post-regulator for SMPS applications requiring compact, efficient power management solutions.

Next step
Start building with AMS1117 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.
01 — Key specifications

Datasheet parameters

Datasheet parameters for AMS1117
ParameterMinTypMaxConditionsSource
quiescent current — 5 mA 11 mA (VIN- VOUT) = 1.5V; ELECTRICAL CHARACTERISTICS AMS datasheet, p. 3 — ELECTRICAL CHARACTERISTICS
output voltage 1.18 V 1.2 V 1.22 V AMS1117-1.2IOUT = 10mA, VIN = 3.2V, TJ = 25°C; 9. Electrical Characteristics UTD datasheet, p. 4 — 9. Electrical Characteristics
output current — 1 A — UTD datasheet, p. 4 — 9. Electrical Characteristics
supply voltage range — — 12 V 8. Recommended Operating Conditions UTD datasheet, p. 3 — 8. Recommended Operating Conditions
operating temperature -40 °C — 125 °C UTD datasheet, p. 3 — 8. Recommended Operating Conditions
psrr 60 dB 75 dB — fRIPPLE = 120Hz, (VIN-VOUT) = 3VVRIPPLE = 1VPP; ripple; 9. Electrical Characteristics UTD datasheet, p. 4 — 9. Electrical Characteristics
dropout voltage — 1 V 1.2 V IOUT = 100mA; 9. Electrical Characteristics UTD datasheet, p. 4 — 9. Electrical Characteristics
output count — 1 — UTD datasheet, p. 4 — 9. Electrical Characteristics
02 — Alternatives

Closest matches to AMS1117

AZ1117-5.0 1.2× higher supply voltage range, similar dropout voltage, similar operating temperature
AZ1117C-3.3 1.2× higher supply voltage range, 1.2× lower quiescent current, 1.2× higher operating temperature
L78M05ABV 2.0× higher dropout voltage, 2.0× lower output current, 1.2× lower psrr
LD1117-3.3 1.5× higher supply voltage range, 1.2× lower output current, 1.2× higher operating temperature
L7805AB 2.9× higher supply voltage range, 2.0× higher dropout voltage, 1.5× higher output current
L78L05AB 10.0× lower output current, 1.7× higher dropout voltage, 1.5× lower psrr
L78L05ABD13TR 10.0× lower output current, 1.9× lower psrr, 1.7× higher dropout voltage
L78M05ABDT 2.9× higher supply voltage range, 2.0× higher dropout voltage, 2.0× lower output current
03 — FAQ

Frequently asked questions

What is the dropout voltage of the AMS1117-3.3 at IOUT = 100mA?

The dropout voltage is 1 V at IOUT = 100mA.

What is the maximum operating temperature?

The maximum operating temperature is 125 °C.

What is the output count for the AMS1117-3.3?

The output count is 1.

What is the output current of the AMS1117-3.3?

The output current is 1 A.

What is the output voltage of the AMS1117-1.2 under the conditions IOUT = 10mA, VIN = 3.2V, and TJ = 25°C?

The output voltage is 1.2 V.

What is the Power Supply Rejection Ratio (PSRR) of the AMS1117-3.3?

The PSRR is 75 dB at fRIPPLE = 120Hz, (VIN-VOUT) = 3V, and VRIPPLE = 1VPP.

What is the quiescent current when (VIN- VOUT) = 1.5V under ELECTRICAL CHARACTERISTICS?

The quiescent current is 5 mA.

What is the supply voltage range for the AMS1117-3.3?

The supply voltage range is 12 V under Recommended Operating Conditions.

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