Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Package | SOT-23-5L |
| Operating/input voltage | 6V |
| Output Voltage | 3.3V |
| Output Current | 150mA |
| Operating Temperature | -40℃~+125℃@(Tj) |
| Number of Outputs | 1 |
| Supply Current (Iq) | 150uA |
Product Overview
LD3985M33R is a STMicroelectronics linear regulator (LDO) identified by the exact orderable code LD3985M33R. Its confirmed technical identity includes Operating/input voltage 6V, Output Voltage 3.3V, Output Current 150mA, Operating Temperature -40℃~+125℃@(Tj).
The exact device is described as: 3.3V Positive Fixed SOT-23-5L Voltage Regulators – Linear, Low Drop Out (LDO) Regulators. Selection should be based on the exact package and the operating conditions required by the design, rather than on a nearby family member or a generic part number.
Technical Specifications
| Parameter | Value |
|---|---|
| Package | SOT-23-5L |
| Operating/input voltage | 6V |
| Output Voltage | 3.3V |
| Output Current | 150mA |
| Operating Temperature | -40℃~+125℃@(Tj) |
| Number of Outputs | 1 |
| Supply Current (Iq) | 150uA |
| Output Configuration | Positive |
| Features | Enable control;Noise bypass terminal;Over Current Protection;Thermal shutdown |
| Output Type | Fixed |
Exact-Part Selection Insight
The exact part combines an output-voltage condition of 3.3V with an output-current rating of 150mA. Verify the stated test/operating conditions and thermal path before treating both limits as simultaneously achievable in the final circuit.
Selection Notes
- Package: SOT-23-5L
- Operating/input voltage: 6V
- Output Voltage: 3.3V
- Output Current: 150mA
- Operating Temperature: -40℃~+125℃@(Tj)
Application Fit
This exact part is appropriate for designs that require a linear regulator (LDO) with the confirmed package and electrical/function parameters above. Final fit depends on the surrounding circuit, interface, thermal and mechanical requirements of the target design.
Design Considerations
Confirm the available supply rail stays inside the stated operating range, including startup and transient conditions.
Check current, power dissipation and board thermal conditions at the intended operating point rather than using the headline rating alone.
Use the exact SOT-23-5L footprint/package definition when checking PCB land pattern, assembly clearance and sourcing equivalence.
Related Engineering Resources
- Datasheet — verified HKEQGOO-hosted technical document for this exact product identity.
Alternative Parts
The following source-displayed parts may be useful for engineering comparison. They are not claimed to be drop-in replacements; verify electrical ratings, package, pinout, lifecycle, and application conditions before substitution.
- LP3985IM5-3.3/NOPB — TI; SOT-23-5
- MIC5255-3.3YD5-TR — MICROCHIP; TSOT-23-5
- LDS3985M33R — ST; SOT-23-5
- LTC1844ES5-3.3#TRMPBF — ADI; TSOT-23-5
- MIC5259-3.3YD5-TR — MICROCHIP; TSOT-23-5
- TPS78433QDBVRQ1 — TI; SOT-23-5
- LP3985IM5X-3.3/NOPB — TI; SOT-23-5
- NCP600SN330T1G — onsemi; TSOP-5
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
Request a Quote
To request a quotation, provide the manufacturer part number, required quantity, destination, target Date Code if applicable, and any testing or inspection requirements.
Alternative Candidates for Engineering Evaluation
Candidate alternative parts require engineering verification before substitution. Electrical characteristics, pinout, package, qualification, and application requirements should be verified before use.
| MPN | Manufacturer | Package |
|---|---|---|
| LP3985IM5-3.3/NOPB | TI | SOT-23-5 |
| MIC5255-3.3YD5-TR | MICROCHIP | TSOT-23-5 |
| LDS3985M33R | ST | SOT-23-5 |
| LTC1844ES5-3.3#TRMPBF | ADI | TSOT-23-5 |
| MIC5259-3.3YD5-TR | MICROCHIP | TSOT-23-5 |
| TPS78433QDBVRQ1 | TI | SOT-23-5 |
| LP3985IM5X-3.3/NOPB | TI | SOT-23-5 |
| NCP600SN330T1G | onsemi | TSOP-5 |
