Parts comparison
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Structured comparison
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Overview
Manufacturer
- AMS1117-3.3
- Advanced Monolithic Systems (widely second-sourced)
- LM2596 Buck Converter Module
- Generic (various OEMs, built around the TI LM2596)
Category
- AMS1117-3.3
- Linear / LDO
- LM2596 Buck Converter Module
- Buck
Object type
- AMS1117-3.3
- ic
- LM2596 Buck Converter Module
- module
Package
- AMS1117-3.3
- SOT-223
- LM2596 Buck Converter Module
- Module
Documented pins
- AMS1117-3.3
- 3
- LM2596 Buck Converter Module
- 4
Interfaces
- AMS1117-3.3
- Unknown
- LM2596 Buck Converter Module
- Unknown
Lifecycle
- AMS1117-3.3
- ACTIVE
- LM2596 Buck Converter Module
- Unknown
Physical pin mapping
- AMS1117-3.3
- Unknown
- LM2596 Buck Converter Module
- Unknown
Browser simulation
- AMS1117-3.3
- Not available
- LM2596 Buck Converter Module
- Not available
Electrical
Topology
- AMS1117-3.3
- ldo
- LM2596 Buck Converter Module
- buck
Min Input Voltage
- AMS1117-3.3
- 4.75 VSource
Below this, output headroom collapses below the dropout spec and 3.3V is no longer guaranteed.
- LM2596 Buck Converter Module
- Varies by vendor
The LM2596 chip itself starts regulating around 4.5V, but the module's input protection/trace design can add its own floor — check your specific board.
Max Input Voltage
- AMS1117-3.3
- 15 VSource
- LM2596 Buck Converter Module
- Varies by vendor
The chip is rated to 40V absolute, but cheap modules' input pads, connectors and PCB clearances are not always built with real 40V margin — many sellers quietly derate. Don't assume the silkscreen number without checking.
Output Voltage
- AMS1117-3.3
- 3.3 VSource
- LM2596 Buck Converter Module
- Not applicable
Adjustable Output
- AMS1117-3.3
- No
This is the fixed -3.3 variant. The adjustable AMS1117-ADJ sets Vout with an external resistor divider instead — different part, not this one.
- LM2596 Buck Converter Module
- Yes
Set by turning the blue trimpot while watching a multimeter on the output — there's no digital readout or detent at common voltages like 5V or 3.3V.
Max Output Current
- AMS1117-3.3
- 1 ASource
- LM2596 Buck Converter Module
- Varies by vendor
The LM2596 chip is rated 3A, but that number assumes the datasheet's reference inductor and adequate cooling. Cheap modules' inductor and copper are usually the real limit — treat 1.5-2A as a safer sustained ceiling unless you've verified your specific board runs cool at 3A.
Dropout Voltage
- AMS1117-3.3
- 1.1 V @ Iout=1 ASource
The headline gotcha of this part. Vin must stay above roughly Vout+dropout (~4.4-4.6V) at full load or the output sags below 3.3V.
- LM2596 Buck Converter Module
- Not applicable
Quiescent Current
- AMS1117-3.3
- LM2596 Buck Converter Module
- Varies by vendor
The bare chip's quiescent draw is small (datasheet: a few mA), but modules often add an LED and other always-on circuitry that draws more than the chip alone.
Performance
Peak Efficiency
- AMS1117-3.3
- Unknown
- LM2596 Buck Converter Module
- Varies by vendor
TI's own eval board reaches up to ~90% in the datasheet's curves, under a specific Vin/Vout/load combination. A $2 module with a lower-Q inductor and thinner copper will usually measure lower — don't assume 90% for a thermal budget.
Switching Frequency
- AMS1117-3.3
- Not applicable
- LM2596 Buck Converter Module
- 150 kHzSource
Fixed by the LM2596 chip's internal oscillator — this is one of the few numbers here that does NOT vary between vendors, since it's set by the silicon, not the board.
Physical
Package
- AMS1117-3.3
- SOT-223
- LM2596 Buck Converter Module
- Module
Length
- AMS1117-3.3
- Unknown
- LM2596 Buck Converter Module
- Varies by vendor
Commonly around 43×21mm for the classic 4-pin-header version, but board outline is not standardized across sellers.
Mounting
- AMS1117-3.3
- smd
- LM2596 Buck Converter Module
- module
Thermal
Max Operating Temp
- AMS1117-3.3
- 125 °CSource
Junction temperature rating — the small SOT-223 tab has limited heat-shedding, so real headroom is lower without PCB copper pour under/around it.
- LM2596 Buck Converter Module
- Unknown
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