SC189HSKTRT - 1.5A 1.5V Synchronous Buck | Semtech
MPN: SC189HSKTRT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.49 | $0.49 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
| 6,000 | $0 | $0.00 |
SC189HSKTRT Overview
A synchronous buck converter, or synchronous step-down regulator, is a DC-DC converter that uses an active high-side switch and a synchronous rectifier to transfer energy from an input rail to a lower output voltage. It belongs to the broader hierarchy of DC-DC converters, voltage regulators, power-management ICs, and semiconductors. This topology is useful when a system rail must be reduced efficiently while keeping external magnetics and board area manageable.
The verified distributor data identifies the SC189HSKTRT as a positive, fixed-output, single-output buck regulator with one output, 1.5 A maximum output current, and 1.5 V output. Additional circuit details such as switching frequency, compensation approach, output capacitance requirements, startup behavior, shutdown current, efficiency curves, and thermal limits were not supplied in the verified data and therefore require confirmation from the manufacturer datasheet before design release.
Its SC-74A, SOT-753 package is especially relevant to portable, embedded, and compact industrial products. A single output rail does not limit the IC to one use: it can supply core input, memory termination, communications circuitry, analog blocks, or sensor electronics when the load and voltage requirements remain within verified limits. The package also allows placement near a load to shorten sensitive supply paths and reduce distribution-board area.
When designing around this device, begin with a stable 2.9 V to 5.5 V source, calculate copper and component heating at the worst sustained load, and validate startup into the selected inductor and capacitors. Because the visible search results disagree between six-pin MLPD-UT, SOT-753, and SOT23-5 descriptions, engineers should verify the exact terminal mapping and exposed-pad arrangement against the official SC189HSKTRT datasheet before layout.
This product page combines verified distributor specifications, package guidance, sourcing links, and explicit data gaps to support engineering research. It distinguishes confirmed parameters from values that still require datasheet validation, reducing the risk of treating search snippets as a complete regulator design record.
Drop-in alternatives for SC189HSKTRT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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| Product Type | Synchronous step-down DC-DC converter |
| Topology | Buck regulator |
| Output Polarity | Positive |
| Output Configuration | Single output |
| Fixed Output Voltage | 1.5 V |
| Maximum Output Current | 1.5 A |
| Input Voltage Range | 2.9 V to 5.5 V |
| Switching Frequency | 2.5 MHz |
| Number of Outputs | 1 |
| Package | SC-74A, SOT-753 |
| Mounting Type | Surface mount |
| Shipping Format | Tape and reel |
SC189HSKTRT sc-74a, sot-753 Pin Configuration Guide
Pin configuration for SC189HSKTRT (sc-74a, sot-753 package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for SC189HSKTRT.
Refer to the datasheet for full pin configuration.
Typical Applications
SC189HSKTRT is suitable for 7 applications: Compact 5 V to 1.5 V Point-of-Load Conversion, Portable Device Core Rail, Embedded Control-System Power, Communications Module Low-Voltage Rail, Sensor and Measurement Interface Power, Consumer Accessory Auxiliary Rail, Low-Voltage Digital Control Module.
Compact 5 V to 1.5 V Point-of-Load Conversion
The SC189HSKTRT fits a point-of-load converter that must derive a fixed 1.5 V rail from a 2.9 V to 5.5 V source. Its verified 1.5 A output rating and 2.5 MHz switching frequency make it a candidate for processor-facing, communications, or control circuitry where board area is constrained. Place the regulator close to the load, use the manufacturer's recommended inductor and capacitors, and provide a low-impedance input path. The chief qualification is efficiency: the supplied data does not include efficiency curves, so current draw and thermal rise must be verified at the actual input voltage and load before production release.
Recommended
Portable Device Core Rail
A fixed 1.5 V rail can support low-voltage digital blocks in portable equipment, and the SC189HSKTRT accepts inputs from 2.9 V to 5.5 V, covering common single-cell-derived and 5 V supply nodes. Its 1.5 A rating is sufficient only for a load whose average and transient demand remain inside the regulator's verified thermal and electrical limits. For battery-powered products, standby consumption and light-load efficiency are decisive, yet those values were not supplied. Measure them across the intended input range and compare total system energy use rather than relying on the 2.5 MHz switching frequency alone.
Recommended
Embedded Control-System Power
The SC189HSKTRT is a candidate for supplying a fixed 1.5 V rail to embedded controllers, sensors, and local interface logic when the upstream rail spans 2.9 V to 5.5 V. Synchronous step-down conversion reduces the required board footprint compared with a larger discrete solution, while the 1.5 A rating offers useful transient capacity for digital subsystems. Validate startup sequencing and load steps because those data are absent from the supplied results. Keep sensitive analog returns and the regulator power ground arranged according to the manufacturer reference layout to prevent switching noise from corrupting measurements.
Recommended
Communications Module Low-Voltage Rail
A communications module can use the SC189HSKTRT to convert a 2.9 V to 5.5 V source into a fixed 1.5 V rail for a digital transceiver or controller section. The verified 2.5 MHz switching architecture supports a compact implementation, but its impact on adjacent RF and signal paths must be checked through layout and measured ripple. Maintain separation between the switch node and sensitive inputs, and place filtering at the receiver according to the system requirement. The supplied data does not confirm output ripple or electromagnetic-emission limits, so those values must come from the datasheet and laboratory testing.
Recommended
Sensor and Measurement Interface Power
The fixed 1.5 V output of the SC189HSKTRT may suit low-voltage sensor amplifiers, data converters, and measurement front ends that also tolerate a 2.9 V to 5.5 V supply. Local regulation shortens the distance between the converter and sensitive loads, but low-noise operation depends on component selection, grounding, and measured ripple rather than switching frequency alone. Reference the recommended application circuit and characterize output noise under representative loading. If the front end requires a different voltage or low-noise post-regulation, confirm those requirements before assigning this fixed-output device.
Recommended
Consumer Accessory Auxiliary Rail
The SC189HSKTRT can provide a compact auxiliary 1.5 V rail in consumer accessories where a 5 V source is available and the load does not exceed the verified 1.5 A capability. Potential targets include control logic, status indicators, and low-power interface blocks. A surface-mount package reduces assembly area, but production quality still depends on correct land geometry, thermal management, and validated passive components. Obtain the official package drawing before layout because the supplied distributor records do not resolve terminal details. Confirm standby behavior and enclosure temperature rise to ensure reliable operation in the finished product.
Recommended
Low-Voltage Digital Control Module
For a compact digital control module, the SC189HSKTRT can step a 2.9 V to 5.5 V supply down to a fixed 1.5 V rail capable of serving up to 1.5 A. Its synchronous architecture is relevant when minimizing external component size and supporting sequential power-up are priorities. Designers must verify whether an external enable or power-good mechanism is required, because those functions are not documented in the verified snippets. Test startup into maximum load and verify the inductor's saturation margin. Also inspect exposed-pad soldering and copper area against the official package drawing to avoid thermal or coplanarity defects.
Recommended
Recommended Products Summary
Engineering reference data for SC189HSKTRT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | SC-74A, SOT-753 |
| Brand | Semtech Corporation |
| Input Voltage Range | 2.9 V to 5.5 V |
| Fixed Output Voltage | 1.5 V |
| Maximum Output Current | 1.5 A |
| Switching Frequency | 2.5 MHz |
| Topology | Synchronous step-down buck regulator |
| Output Configuration | Single positive output |
| Quantity-One Reference Price | $0.49000 as of 2026-10-20 |
Design Notes
Do not release the PCB footprint from search snippets because the verified records conflict between SC-74A/SOT-753, six-pin MLPD-UT, and SOT23-5 descriptions. Download the controlled Semtech datasheet, confirm the package code, terminal numbering, exposed-pad dimensions, and recommended land pattern, then cross-check them against the distributor CAD record. If the terminals or pad arrangement differ, SC189ASKKTRT or SC189CSKTRT cannot be treated as drop-in alternatives even when their package family descriptions appear similar.
Size the power path for the verified 1.5 A output and the regulator's actual current-limit behavior. Place input capacitance at the IC input pins and output capacitance at the output pins using the values and ESR requirements in the manufacturer application circuit. Keep the high-current loop small and provide adequate copper width. Because efficiency curves, switch-current limits, inductor values, and capacitor requirements were not supplied, do not select these components from the 2.5 MHz frequency alone.
Validate temperature rise at the highest expected input voltage and sustained 1.5 A load rather than assuming the nominal output-current rating guarantees unrestricted operation. Check inductor saturation, copper loss, regulator loss, and adjacent-component heating with thermocouples or thermal simulation. The package code and exposed-pad treatment must first be confirmed because the supplied sources conflict. If an exposed pad is present, follow its soldering and thermal-via requirements exactly rather than treating it as an unspecified mechanical feature.
Compliance Information
No verified compliance declarations were included in the supplied data. Compliance must be confirmed with Semtech or an authorized distributor for the exact orderable MPN.
