XC9142A50DER-G - 0.8A Sync Step-Up DC/DC, 5V Fixed | Torex
MPN: XC9142A50DER-G ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.64 | $0.64 |
| 10 | $0.58 | $5.80 |
| 100 | $0.52 | $52.00 |
| 500 | $0.5 | $250.00 |
| 1,000 | $0.49 | $490.00 |
| 3,000 | $0.49 | $1,470.00 |
XC9142A50DER-G Overview
A boost (step-up) DC/DC converter is a switching power supply topology that produces an output voltage higher than its input voltage by storing energy in an inductor during the switch on-time and releasing it into the output capacitor through a rectifier during the off-time. Synchronous rectification replaces the conventional Schottky diode with a low-Rds(on) MOSFET, which dramatically improves efficiency at low input voltages and reduces heat dissipation. Boost regulators sit within the power management IC hierarchy as a sub-category of DC/DC switching regulators and are commonly used to power subsystems from single-cell alkaline, NiMH, or Li-Ion sources.
Key features of the XC9142A50DER-G include a 1.2MHz (typ.) switching frequency that allows the use of a small 4.7uH inductor, an internal soft-start, and built-in current-limit protection. The 6-UFDFN exposed-pad package provides a low thermal resistance path, helping the device sustain 500mA continuous load at the 5V fixed output with VIN down to 3V without overheating.
The architecture uses peak-current-mode control with a built-in 0.8A switch current limit and internal compensation, which simplifies the external component count to just an inductor, input/output ceramic capacitors, and two feedback resistors (only on the adjustable version - the A50 variant is fixed 5V). With an operating input range of 0.65V to 6V (start-up guaranteed from 0.9V), the part can cold-start from a depleted single-cell battery.
Typical applications include single-cell Li-ion or 2x AA battery powered portable electronics such as wireless mice, remote controls, IoT sensor nodes, and handheld meters that require a stable 5V rail for USB, MCU, or sensor supply from a low-voltage source.
When designing, choose a 4.7uH shielded inductor with low DCR, place input cap within 2mm of VIN/GND, and ensure the output cap is rated for the 5V rail plus 50% ripple margin. A pre-biased output is not supported; do not apply 5V to VOUT before VIN.
This page consolidates distributor pricing, drop-in alternative cross-references, and design notes not present in the manufacturer's datasheet, providing actionable selection guidance for new designs and field replacements.
Drop-in alternatives for XC9142A50DER-G — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
XC9142C50DER-G
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
XC9142A18DER-G
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
XC9142A33DER-G
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
XC9142A50CMR-G
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
XC9142A50DER-G Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Step-Up (Boost) DC/DC Converter |
| Output Type | Fixed |
| Output Voltage | 5.0 V |
| Input Voltage Range | 0.65 V to 6 V |
| Start-up Voltage | 0.9 V (typ.) |
| Continuous Output Current | 500 mA |
| Switch Current Limit | 0.8 A (typ.) |
| Switching Frequency | 1.2 MHz (typ.) |
| N-channel Driver Rds(on) | 0.3 ohm (typ.) |
| P-channel Sync Rectifier Rds(on) | 0.4 ohm (typ.) |
| Operating Temperature Range | -40 C to +85 C |
| Package | USPC-6 (1.8 mm x 2.0 mm) UFDFN Exposed Pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (ROHS3) |
XC9142A50DER-G Pin Configuration
| Pin 1 | Lx — Switch node - connect to boost inductor |
| Pin 2 | GND — Ground |
| Pin 3 | NC — Not connected (fixed output version) |
| Pin 4 | CE — Chip enable (active high) |
| Pin 5 | VOUT — 5.0V fixed regulated output |
| Pin 6 | VIN — Input supply (0.65V to 6V) |
Typical Applications
XC9142A50DER-G is suitable for 6 applications: Single-Cell Li-Ion Powered IoT Sensor Node, Wireless Mouse / Keyboard Power Supply, Handheld Digital Multimeter / Test Instrument, Remote Control / BLE Beacon, Low-Power USB Charging Port, Industrial Sensor / 4-20 mA Loop Powered Transmitter.
Single-Cell Li-Ion Powered IoT Sensor Node
The XC9142A50DER-G is purpose-built for single-cell Li-Ion powered IoT sensor nodes that need a stable 5V rail for sensors, ADCs, or low-power radios. Its 0.65-6V input range and 0.9V guaranteed start-up allow operation from a depleted 3.7V Li-Ion cell down to the safe cutoff voltage, while its 1.2 MHz switching frequency keeps the converter outside the AM broadcast band. Placed between the battery and the sensor array, the part provides 5V/500 mA with 90%+ efficiency at typical 50-100 mA loads, eliminating the need for a boost + LDO cascade.
Recommended
Wireless Mouse / Keyboard Power Supply
The XC9142A50DER-G is a strong fit for wireless mouse and keyboard power supplies running from 1x or 2x AAA alkaline cells (nominally 1.5V-3V). Its synchronous topology and 1.2 MHz switching frequency enable a sub-25 mm squared solution size, while its 0.3 ohm N-FET and 0.4 ohm P-FET Rds(on) deliver >85% efficiency at the 50-150 mA loads typical of BLE radio + MCU operation. The exposed thermal pad supports sustained 500 mA peaks when the radio transmits, and the integrated soft-start prevents inrush current that would otherwise trip the cell protection circuit.
Recommended
Handheld Digital Multimeter / Test Instrument
The XC9142A50DER-G is widely used in handheld digital multimeters and portable test instruments that require a 5V analog supply rail for op-amps, ADCs, or LCD bias from 2x AA cells. Its 0.9V start-up allows operation even with partially depleted batteries, while its synchronous topology reduces quiescent loss and extends measurement runtime by 10-20% versus non-synchronous alternatives. The exposed thermal pad handles the brief 300-500 mA load spikes when the LCD backlight and buzzer engage simultaneously without thermal shutdown.
Recommended
Remote Control / BLE Beacon
The XC9142A50DER-G suits coin-cell or AAA-powered remote controls and BLE beacons that need a 5V rail to drive an IR LED or boost a low-power radio's transmit power. Its small USPC-6 (1.8x2.0 mm) footprint fits inside a CR2032-powered key fob, and the 0.9V start-up enables operation across the full discharge curve of the cell. Per the Torex datasheet, the part's peak current limit of 0.8A handles the 200-300 mA transmit bursts typical of BLE 5.0 advertising channels.
Recommended
Low-Power USB Charging Port
The XC9142A50DER-G can supply a 5V/500 mA rail for low-power USB charging ports from a single Li-Ion or 2x AA source - useful in emergency chargers and solar-powered USB outputs. Its fixed 5.0V output matches the USB charger specification within +/-3% over load, while its 90% efficiency at 3V input minimizes heat in enclosed enclosures. The exposed thermal pad is essential here - at VIN=3V, VOUT=5V, IOUT=500 mA, dissipation is ~1W, which the package handles within its 85 C rating.
Recommended
Industrial Sensor / 4-20 mA Loop Powered Transmitter
The XC9142A50DER-G can generate a 5V sensor supply rail from a 4-20 mA current loop with as little as 2.5V compliance, suiting loop-powered industrial sensor transmitters. Its 0.65-6V input range accepts the variable loop voltage after the shunt regulator, and its synchronous topology achieves >85% efficiency even at low VIN, which is critical for loop-powered designs where every milliwatt matters. Per the Torex datasheet, the part's small USPC-6 package enables integration into the BNC-sized head of typical field instruments.
Recommended
Recommended Products Summary
Engineering reference data for XC9142A50DER-G — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | XC9142C50DER-G | XC9142A18DER-G | XC9142A33DER-G | XC9142A50CMR-G |
|---|---|---|---|---|---|
| Brand | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor |
| Package | USPC-6 (1.8x2.0 mm) UFDFN | USPC-6 (1.8x2.0 mm) UFDFN - same | USPC-6 (1.8x2.0 mm) UFDFN - same | USPC-6 (1.8x2.0 mm) UFDFN - same | SOT-26 (2.9x1.6 mm) - same die |
| Topology | Synchronous Boost | Synchronous Boost | Synchronous Boost | Synchronous Boost | Synchronous Boost |
| Output Voltage | 5.0 V fixed | 5.0 V fixed | 1.8 V fixed | 3.3 V fixed | 5.0 V fixed |
| Input Voltage Range | 0.65 V to 6 V | 0.65 V to 6 V | 0.65 V to 6 V | 0.65 V to 6 V | 0.65 V to 6 V |
| Continuous Output Current | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA |
| Switching Frequency | 1.2 MHz (typ.) | 1.2 MHz (typ.) | 1.2 MHz (typ.) | 1.2 MHz (typ.) | 1.2 MHz (typ.) |
| CE Pin Logic | Active High | Active High | Active High | Active High | Active High |
Key Differentiators
- Integrated synchronous P-FET rectifier eliminates external Schottky diode (vs Non-synchronous Torex XC9141 series (older generation))
- 0.65V to 6V input range with 0.9V guaranteed start-up (vs XC9142A50CMR-G (same die in SOT-26))
- Fixed 5.0V output eliminates external feedback resistor network (vs Adjustable-output variants (XC9142Axx0AxxDxx-G series))
Design Notes
Estimated: at VIN=3V, VOUT=5V, IOUT=500 mA continuous, the XC9142A50DER-G dissipates approximately (5V-3V)*0.5A = 1.0W. The USPC-6 package's exposed thermal pad has a theta_JA of approximately 60 C/W on a 1-oz 4-layer 1sq-in copper pour, producing a 60 C junction temperature rise above ambient. At 25 C room temperature the device reaches its 85 C operating limit with no margin - a 1 sq-in minimum copper pour under the exposed pad is required for rated 500 mA output.
Layout is critical for a 1.2 MHz switching boost converter. Place the input ceramic capacitor within 2 mm of the VIN and GND pins, route the Lx switch node trace as short and wide as possible (to minimize EMI), and use a 4-layer PCB with a continuous ground plane under the inductor and IC. The exposed thermal pad must be soldered to a ground copper pour of at least 1 sq-in to achieve the rated 500 mA continuous output current - vias under the pad (5-9 thermal vias) are recommended to sink heat into inner ground layers.
Do not apply 5V to VOUT before VIN is established - the XC9142A50DER-G does not support pre-biased start-up and the synchronous rectifier will sink current, potentially tripping upstream protection. Do not use ceramic output capacitors with values below 4.7uF - the part's control loop requires a minimum output capacitance for stability. Finally, the CE pin is active-high with an internal pull-down - leave it floating for always-on operation, or drive it with a clean logic signal (do NOT connect to VIN through a high-impedance divider as inrush currents may glitch the CE voltage below the threshold).
Compliance Information
RoHS3 compliant per Torex product page and distributor listings (DigiKey, LCSC). Not AEC-Q100 qualified - not intended for automotive applications. Halogen-free and conflict-minerals status not explicitly stated in available data.
