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Texas Instruments LM3670MF-1.8 — Logic ICs
Texas Instruments

Texas Instruments LM3670MF-1.8 Buck Regulator, 350 mA

MPNLM3670MF-1.8
End of Life

Texas Instruments LM3670MF-1.8, step-down buck regulator, fixed 1.8 V output, 350 mA, 1 MHz switching, synchronous rectifier, SOT-23-5, -40°C to 85°C.

$0.41Ref. price · indicative, final on quote
LM3670MF-1.8 datasheet
PackagingSC-74A, SOT-753
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

LM3670MF-1.8 Technical Specifications
ParameterValue
Output typeFixed
Mounting typeSurface Mount
Voltage - input5.5V
Voltage - output (Min (Fixed))1.8V
Current - output350mA
Frequency1MHz
Number of outputs1
Operating temperature-40°C ~ 85°C (TA)
PackageBulk
FunctionStep-Down
TopologyBuck
CaseSC-74A, SOT-753
Output configurationPositive
Synchronous rectifierYes

Product details

Fixed 1.8 V output, 350 mA — a compact rail for 1.8 V loads

It integrates a synchronous rectifier for efficiency and switches at 1 MHz, allowing small external inductor and capacitor values. The SOT-23-5 package keeps the footprint tight, suitable for space-constrained boards in industrial control, portable instrumentation, and telecom modules where a stable 1.8 V rail is needed.

350 mA at 1 MHz — sizing the output stage

With a 350 mA current rating, this part fits low-to-moderate power loads such as MCU I/O banks, sensor supplies, or wireless module rails. The 1 MHz switching frequency keeps the inductor in the 2.2 µH to 4.7 µH range and the output capacitor at 10 µF or less, saving board area. The synchronous rectifier eliminates the external Schottky diode, reducing BOM count and improving efficiency at light loads.

It is RoHS non-compliant per the listing, so designs requiring RoHS exemption or lead-free assembly should verify the solder alloy compatibility.

Frequently asked questions

Can LM3670MF-1.8 replace LM3670MF-1.5?

The LM3670MF-1.8 and LM3670MF-1.5 are pin-compatible and share the same package (SOT-23-5) and electrical ratings except for the fixed output voltage — 1.8 V versus 1.5 V. If your load requires 1.8 V, this part is a drop-in replacement; if you need 1.5 V, you need the -1.5 variant.