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TPS54308DDCR

Texas Instruments

Texas Instruments TPS54308DDCR, step-down (buck) switching regulator, 3 A output, adjustable output, 4.5 V to 28 V input range, 350 kHz switching frequency, synchronous rectification, SOT-23-6 Thin package, -40°C to 125°C.

Texas Instruments TPS54308DDCR
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[IN STOCK] In Stock: 220 pcs
$8.08/ pc

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MOQ 1 · Tape & Reel (TR); Cut Tape (CT) · RoHS · EIA-481 · DAP/DDP · T/T

[ORIGINAL SEALED] [PRE-SHIP HD PHOTOS] [30D WARRANTY · COC] [TRACKED DAP/DDP]

Technical specifications

TPS54308DDCR specifications
Parameter / AttributeSpecification / Value
Output typeAdjustable
MountingSurface Mount
Voltage - input4.5V
Voltage - output26V
Voltage - output (Min (Fixed))1V
Output current3A
Frequency - switching350kHz
I/O channels1
Operating temperature-40°C~125°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionStep-Down
TopologyBuck
CaseSOT-23-6 Thin, TSOT-23-6
Output configurationPositive
Synchronous rectifierYes
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for TPS54308DDCR?

Package: SOT-23-THIN-6 (DDC) · Pin-compatible replacements with immediate Shenzhen spot stock

Footprint Match 98%
Supply Chain & Allocation Reality:

The TPS54302 is the modern tiny buck of industrial and consumer boards - 4.5V to 28V input, 3A output, SOT-23-THIN-6, with the EMI spread-spectrum and light-load pulse-skipping that certificate-bound designs lean on. Inside the TI family the substitution is easy and documented: the 2A/3A/4A members are pin-to-pin. Outside the family the SOT-23-6 outline is a siren call - dozens of parts from six-plus manufacturers share the body, and very few survive the four questions that separate a functional replacement from a BOM line that fails EMI retest or drops out under light load.

Verified Pin-Compatible Replacements (3 verified alternatives)

TPS54202 Texas Instruments SOT-23-THIN-6 (DDC)
Pin-to-Pin (Minor Clock/Init Tuning)
Availability & Target Pricing:

The 2A Member of the Same Ladder

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

Pin-to-pin sibling rated 2A instead of 3A, same 400kHz class fixed frequency, peak current mode and the same light-load architecture.

Same 4.5V to 28V input envelope; the output current ceiling is the difference.

Compatibility & Drop-In Notes: The safe direction is down only with the load budget checked: a 2A part in a 3A socket is a thermal plan, not a substitution. As a documented same-family swap it is otherwise clean.
Package & Solder Footprint: Identical DDC land pattern and pinout - the family was designed as one layout scaled by current.
Shenzhen Warehouse Stock & MOQ: Stocked across the ladder; quote the grade the load actually needs.
Request Volume Quote for TPS54202 Compare TPS54308DDCR vs TPS54202 Spec Matrix
TPS54308 Texas Instruments SOT-23-THIN-6 (DDC)
Pin-to-Pin (Minor Clock/Init Tuning)
Availability & Target Pricing:

Same Footprint, Different Light-Load Behavior

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The same six-pin footprint at a fixed 350kHz in forced-continuous-conduction mode: no pulse-skipping at light load, no spread-spectrum EMI feature.

Same input range class; check the datasheet figures for the exact grade.

Compatibility & Drop-In Notes: The classic gotcha of this family: pin-identical, behaviorally different. In a battery or standby design the 54308 runs hotter at light load; in an EMI-certified design it loses the spread-spectrum the certificate may lean on. Check both before the swap.
Package & Solder Footprint: Identical DDC pinout.
Shenzhen Warehouse Stock & MOQ: Stocked as the FCCM option for noise-sensitive loads that disliked pulse-skipping.
Request Volume Quote for TPS54308 Compare TPS54308DDCR vs TPS54308 Spec Matrix
TPS62933 Texas Instruments SOT-583
Functional Equivalent
Availability & Target Pricing:

The Modern Successor - Board Revision Included

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

TIs current recommended alternate: 3.8V to 30V input, 3A, lower quiescent current and higher switching frequency for smaller passives.

Wider input window; modern low-Iq design point.

Compatibility & Drop-In Notes: The honest sentence: the 62933 replaces the 54302 in a design review, not in a socket. SOT-583 is a different land pattern; where a repair needs the board to stay, stay on the DDC family.
Package & Solder Footprint: SOT-583 against SOT-23-THIN-6 - different footprint.
Shenzhen Warehouse Stock & MOQ: Active TI production; stocked for redesign builds.
Request Volume Quote for TPS62933 Compare TPS54308DDCR vs TPS62933 Spec Matrix
Buyer & Quality Checklist for Sourcing Alternatives
  • The four questions before any SOT-23-6 buck swap: switching frequency (sets the inductor), control architecture (peak current mode against voltage-mode or COT), light-load mode (pulse-skipping against forced continuous), and EMI features (spread spectrum present or not). A part that fails any of the four is a board project, not a BOM substitution.
  • Inside the TPS54202/54302/4A ladder the swap is documented pin-to-pin; choose the current grade against the real load and thermal plan, not the datasheet headline.
  • TPS54308 shares the footprint but runs FCCM without spread spectrum - the two visible deltas are light-load efficiency and conducted EMI.
  • Beware lookalikes: the six-pin outline is shared by dozens of parts across manufacturers; most differ in at least one of the four questions. Verify each against the datasheet, never by package photo.
  • On repair, check the passive network first: the inductor value and the feedback divider are tuned to the specific part. A substitution with a different frequency or reference voltage silently changes the output.
  • Ripple and thermal budget scale with frequency: when the substitution changes fsw, re-check the output ripple and the inductor saturation at the highest ambient the board sees.
Frequently Asked Technical Questions

Q: Is TPS54202 pin-compatible with TPS54302?

A: Yes - the 2A and 3A members of the TIs six-pin SOT-23-6 buck ladder are pin-to-pin on the same layout, as is the 4A member. Substitute downward only with the load and thermal budget checked.

Q: Can TPS54308 replace TPS54302?

A: Same footprint and pinout, different behavior: the 54308 runs forced-continuous at about 350kHz without the 54302 spread-spectrum EMI feature. Fine as a substitution where ripple and light-load efficiency allow; verify EMI and standby budgets first.

Q: Why do other SOT-23-6 bucks not just work?

A: Because the package is not the design: frequency, control loop, light-load mode and EMI behavior all live inside the six pins. A lookalike with a different control architecture changes the loop compensation and the transient response even when it physically fits.

Technical details

3 A buck regulator in a SOT-23-6 footprint

The adjustable output voltage can be set from 1 V up to 26 V, covering common 1.8 V, 3.3 V, 5 V, and 12 V system rails.

Switching frequency and inductor sizing

The 350 kHz switching frequency is a practical middle ground. At this frequency, output ripple is manageable with a standard ceramic output capacitor; the designer does not need a high-ESR electrolytic for stability.

The SOT-23-6 Thin package has a small footprint (roughly 2.9 mm × 2.8 mm), but the thermal resistance is higher than a larger package like SOIC-8.

TPS54308DDCR
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