TPS54331D Alternatives and Replacements: Equivalent Buck Regulators (2026)

Bottom Line: The closest drop-in replacement for the TPS54331D is the TPS54331DR (same die, tape-and-reel packaging). For pin-compatible alternatives in the same SOIC-8 footprint, the TPS5430DDAR offers a wider 5.5–36 V input range at 500 kHz; the LM2596T-12 family (TO-220) targets cost-down builds at 150 kHz; and the MP1584EN from Monolithic Power Systems is a popular high-frequency (1.5 MHz) alternative when board area is tight. None are 1:1 functional clones — switching frequency, input range, and compensation networks differ — so always verify your feedback loop and inductor selection against the candidate datasheet before substitution.

The TPS54331D appears in countless DC-DC reference designs from 2010 onward, and most "TPS54331 equivalent" searches come from engineers facing allocation, end-of-life notices, or cost pressure on legacy boards. This guide compares the four most common replacement paths against the TPS54331D's actual datasheet specs and tells you exactly when each works.

Specifications Comparison Table

Parameter	TPS54331D	TPS5430DDAR	LM2596T-12	MP1584EN	TPS54302DDCT
Manufacturer	TI	TI	TI	MPS	TI
Topology	Buck, integrated FET	Buck, integrated FET	Buck, integrated BJT	Buck, integrated FET	Buck, integrated FET
Input Voltage Range	3.5–28 V	5.5–36 V	4.5–40 V	4.5–28 V	4.5–28 V
Output Voltage	0.8–25 V (adj.)	1.22–31 V (adj.)	Fixed 12 V (or ADJ variant)	0.8–25 V (adj.)	0.6–7 V (adj.)
Output Current	3 A	3 A	3 A	3 A	3 A
Switching Frequency	570 kHz	500 kHz	150 kHz	1.5 MHz (typ.)	1 MHz
Feedback Reference	0.8 V	1.221 V	1.23 V (ADJ)	0.8 V	0.6 V
Quiescent Current (active)	~3 mA	~5 mA	~5 mA	~1.5 mA	~600 µA
Shutdown Current	<2 µA	<18 µA	~50 µA	<1 µA	<2 µA
Soft Start	Internal (3.5 ms)	Internal (8 ms)	None	Adjustable (external cap)	Internal
Compensation	External	External	Internal	External	Internal
Package	SOIC-8	SOIC-8 (PowerPAD)	TO-220-5	SOIC-8 / SOT23-8	SOT-23-6
Pin-Count	8	8	5	8	6
Operating Temp	-40 to +150 °C	-40 to +150 °C	-40 to +125 °C	-40 to +85 °C	-40 to +150 °C
Unit Price (1K, 2026)	~$1.20	~$1.50	~$0.65	~$0.40	~$0.85

Sources: SLVS876 (TPS54331), SLVS632 (TPS5430), SNVS124 (LM2596), MP1584 datasheet rev 1.0, SLVSAS6 (TPS54302).

TPS54331DR — Same Silicon, Different Reel

The TPS54331DR is functionally identical to the TPS54331D — same die, same SOIC-8 package, same pinout, same specifications. The only difference is packaging: the "R" suffix indicates 2,500-piece tape-and-reel for automated SMT assembly, while the bare "D" suffix typically ships in tubes. If your CM has been quoting on tubes and now needs reel for a higher-volume run, this is a paperwork swap, not a redesign. Lead times track each other within a few weeks.

TPS5430DDAR — Higher Input Voltage, Lower Frequency

The TPS5430DDAR targets the same 3 A output class as the TPS54331D but pushes input voltage to 36 V, making it the natural choice when your supply rail is 24 V nominal with possible spikes above 28 V. Switching frequency drops from 570 kHz to 500 kHz — a ~12% reduction that lets you keep a similar inductor value. The trade-off is a higher feedback reference (1.221 V vs 0.8 V) which forces you to recalculate your resistor divider, and a different compensation network because the internal error amplifier characteristics differ.

For migration: keep the same inductor (typ. 33–47 µH, 3 A saturation), recompute R1/R2 against the new 1.221 V reference, and re-tune the Type-II compensation. The PowerPAD on the DDAR package improves thermals — useful at the high end of the input range where switch losses grow.

LM2596T-12 — Cost-Down Path, Frequency Penalty

The LM2596T-12 (and its NOPB / S-suffix variants) is the textbook "cheap 3 A buck" — four decades old, in production at multiple foundries, and ~half the unit cost of the TPS54331D. It is not pin-compatible: TO-220-5 through-hole vs SOIC-8 SMD, and the 150 kHz switching frequency forces much larger inductors (typ. 100 µH+) and bulk capacitance. EMI behavior differs: the lower frequency reduces high-frequency emissions but pushes fundamental harmonics into bands where filtering is harder.

Choose LM2596 when:

Cost dominates and board area is unconstrained
You can accept TO-220 thermal management (heatsink or copper pour)
Your downstream load tolerates higher output ripple (~60 mV vs 25 mV)

For a step-by-step on switching regulator selection across topologies and frequencies, see our switching voltage regulator selection guide.

MP1584EN — High-Frequency, Compact

The MP1584EN from Monolithic Power Systems is the most common "TPS54331 substitute" in cost-sensitive designs from China-based contract manufacturers. At 1.5 MHz default switching, it shrinks the inductor to 3.3–4.7 µH and the output capacitor to 22 µF ceramic — saving 30–50% PCB area vs the TPS54331D. The pinout differs (SOIC-8 but reordered), so this is a redesign, not a substitution.

Caveats: MP1584 lacks the TPS54331's 150 °C junction-temperature rating (MP1584 is 85 °C ambient operating), which limits use in industrial enclosures. Sourcing is also riskier — MPS counterfeits are common in the gray market, so always source from authorized channels or use FindMyChip's 5-point authentication on every shipment.

Note: the MP1584EN is not currently in our active inventory database, so we have no /parts/ link for it — confirm availability with your distributor before specifying it on a production BOM.

TPS54302DDCT — Modern Drop-In Class, Smaller Package

The TPS54302DDCT is TI's newer (2018+) 3 A buck in a SOT-23-6 footprint. It is not pin-compatible with the TPS54331D — fewer pins, different package — but offers superior performance per square millimeter: 1 MHz switching, 600 µA quiescent current, internal compensation. For a fresh design where you control the layout, the TPS54302 is the better engineering choice; as a drop-in for an existing TPS54331D board, it is not viable.

Other modern TI alternatives worth considering for new designs:

TPS54310PWP — same 3 A class, but limited to 3–6 V input (point-of-load applications)
TPS54320 / TPS54331 family extensions — see our search index for live availability

When to Choose Each Replacement

Choose TPS54331DR (drop-in tape-and-reel) when:

You need a literal 1:1 swap, no redesign
Your assembly line moved from tube to reel feed
You are unsure whether your reference design has subtle dependencies on TPS54331-specific behavior

Choose TPS5430DDAR when:

Your input rail is 24 V nominal or has surge requirements above 28 V
You can tolerate recalculating the feedback divider
Thermals matter and you want the PowerPAD package

Choose LM2596 family when:

Cost is the dominant constraint
Board area is plentiful (consumer power adapters, lighting controllers)
You accept TO-220 mechanical assembly

Choose MP1584EN when:

Board area is severely constrained
You source from a CM with established MPS authorized channels
Operating ambient stays below 85 °C
Cost matters and counterfeit risk is mitigated

Choose TPS54302DDCT when:

This is a fresh design (not a drop-in)
You want the smallest possible footprint
You can dedicate a milliamp or two of margin to internal compensation tuning

Common Pitfalls When Replacing the TPS54331D

Forgetting the feedback divider — the TPS5430's 1.221 V reference vs the TPS54331's 0.8 V silently shifts your output voltage by ~50% if you copy the BOM. Always recompute R1/R2.
Reusing the inductor at a different frequency — moving from 570 kHz to 150 kHz (LM2596) requires 4–7× larger inductance for the same ripple. Skipping this causes saturation and thermal failure.
Counterfeit risk on cost-down paths — LM2596 and MP1584 are heavily counterfeited. Always source from authorized distributors or platforms with batch authentication; see our counterfeit avoidance guide.
Compensation copy-paste — internal-comp parts (TPS54302, MP1584) and external-comp parts (TPS54331, TPS5430) cannot share Type-II networks. Recompute or remove the compensation pieces entirely.

FAQ

Is the TPS54331D end-of-life? No. As of April 2026, TI lists the TPS54331D as Active in its product longevity program with no announced obsolescence. Some packages may show extended lead times during allocation, but the part itself remains in production.

What is the closest no-redesign replacement? The TPS54331DR — same die, tape-and-reel packaging instead of tubes. For a true alternate-source-on-the-same-PCB scenario without a redesign, the TPS54331D has no exact second source; engineers typically qualify the TPS5430DDAR as a partial second source with a small feedback-network change.

Can I use the LM2596 in place of TPS54331 directly? No — different package (TO-220 vs SOIC-8), different pinout, different switching frequency. The LM2596 is a candidate for a redesigned board with a cost-down target, not a drop-in.

Why does MP1584 cost half as much as TPS54331? MPS targets aggressive China-domestic pricing and runs at higher process density. The TPS54331's premium reflects TI's qualification, longevity guarantees, and -40 to +150 °C junction rating — features that matter in industrial and automotive applications but are dispensable in consumer designs.

How do I source these parts during allocation? Submit an RFQ on FindMyChip with your full BOM and quantities — we cross-check live availability across 200+ verified distributors and return ranked sourcing options within 24 hours, with 5-point authentication on every shipment.

Conclusion

The TPS54331D has aged well as a 3 A buck regulator, but most engineers searching for "TPS54331 equivalent" are not looking for an exact clone — they are working through allocation, cost-down, or area-down pressure on existing boards. The TPS54331DR is the trivial fix; the TPS5430DDAR is the nearest pin-compatible upgrade; the LM2596 and MP1584 trade footprint and frequency for cost; and the TPS54302DDCT is the modern starting point for a fresh design.

Once you have shortlisted, submit your RFQ to lock in availability and competitive China-direct pricing across all five candidates in a single response.