XC6505B501MR-G - 200mA LDO Regulator, 5V Fixed, 10.5V Max Input | Torex
MPN: XC6505B501MR-G ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.13 | $0.13 |
| 10 | $0.12 | $1.20 |
| 100 | $0.1 | $10.00 |
| 500 | $0.08 | $40.00 |
| 1,000 | $0.07 | $70.00 |
| 3,000 | $0.06 | $180.00 |
XC6505B501MR-G Overview
The XAIPART answer capsule: brand + MPN, product type (LDO linear regulator), three headline specs (5 V fixed output, 200 mA IOUT, 10.5 V max VIN), package (SOT-25). Background context: an LDO (Low-Dropout) regulator is a subclass of linear voltage regulator that maintains a stable output voltage even when the difference between input and output voltage is small (low dropout). Within the broader hierarchy, the XC6505B501MR-G sits under: LDO -> linear regulator -> voltage regulator -> power management IC (PMIC) -> semiconductor. Its role in a system is to provide a clean, low-ripple supply rail to downstream analog or digital loads from a higher-voltage or noisy input rail.
Key features include a low quiescent current (Torex markets the family as 'Low Quiescent Current'), high-speed transient response, integrated overcurrent protection, and a typical dropout of only 140 mV at 200 mA load. The fixed 5.0 V output eliminates external resistor dividers, simplifying BOM and saving PCB real estate compared with adjustable-output LDOs. The SOT-25 (5-pin SOT-23 family) package is one of the most common small-footprint surface-mount packages, enabling compact designs in space-constrained applications.
Architecturally, the XC6505B501 uses a P-channel MOSFET pass element topology, which is why dropout is held to 140 mV and quiescent current remains low. The high-speed error amplifier and small output capacitor requirement allow the regulator to respond quickly to load transients, making it suitable for digital logic and RF supply rails where fast dynamic load steps occur.
Typical applications include battery-powered portable electronics, IoT sensor modules, microcontroller (MCU) and digital logic power rails, and as a post-regulator following a switching converter to suppress switching ripple. The 5.0 V fixed output is a direct match for many MCU and sensor supply requirements. For broader system use, the XC6505 series from Torex is also offered in other fixed voltages (e.g., 3.3 V) within the same SOT-25 footprint, enabling PCB layout reuse.
Design tip: ensure the input capacitor meets the datasheet ESR/ceramic-X7R requirements, and place it close to the VIN pin to suppress input-voltage ringing during load transients. Verify that maximum power dissipation does not exceed the SOT-25 thermal rating at your ambient temperature - at 200 mA and a high VIN-VOUT differential, the regulator can dissipate several hundred milliwatts.
This page synthesizes distributor pricing, drop-in cross-references, application circuits, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference to evaluate, source, and design with the XC6505B501MR-G.
Drop-in alternatives for XC6505B501MR-G — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with XC6505B501MR-G (same form factor and footprint) — differing in Manufacturer, Package, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
XC6505B331MR-G
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
XC6505B181MR-G
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
XC6505B251MR-G
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
XC6504B501MR
✅ Drop-In📋 Reference alternative (not in catalog)
XC6206P502MR
✅ Drop-In📋 Reference alternative (not in catalog)
XC6505B501MR-G Maximum Ratings & Electrical Characteristics
| Manufacturer | Torex Semiconductor |
| Part Number | XC6505B501MR-G |
| Product Type | LDO Linear Voltage Regulator (PMIC) |
| Output Type | Fixed |
| Output Voltage | 5.0 V |
| Input Voltage Min | 1.7 V |
| Input Voltage Max | 10.5 V |
| Maximum Output Current | 200 mA |
| Dropout Voltage (typical) | 140 mV at 200 mA |
| Operating Temperature Range | -40 C to +105 C (TA) |
| Package | SOT-25 (5-pin SOT-23 family) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR), Cut Tape (CT) |
| Output Configuration | Positive, Single Output |
| Quiescent Current | Low (Torex 'Low Quiescent Current' family) |
XC6505B501MR-G Pin Configuration
| Pin 1 | VIN — Input supply voltage (1.7 V to 10.5 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | CE — Chip enable (active high) |
| Pin 4 | NC — Not connected (per datasheet) |
| Pin 5 | VOUT — Regulated 5.0 V output |
Typical Applications
XC6505B501MR-G is suitable for 6 applications: Battery-Powered IoT Sensor Node, Microcontroller 5V Logic Supply Rail, Post-Regulator After Switching Converter, USB-Powered Device 5V Rail, Industrial Sensor Signal Conditioning, Portable Consumer Audio Accessory.
Battery-Powered IoT Sensor Node
The XC6505B501MR-G's low quiescent current (Torex 'Low Quiescent Current' family) and 200 mA output fit battery-powered IoT sensor nodes directly. With a 5.0 V fixed output and 1.7 V minimum VIN, it can be powered from a single-cell Li-ion (~3.0 V to 4.2 V) or 2xAA batteries while delivering a clean 5.0 V rail for legacy 5 V sensors. Dropout of just 140 mV at 200 mA means it stays in regulation for most of the battery discharge. Pair with a 1 uF ceramic input/output capacitor and a small BLE or sub-GHz module for a complete low-power IoT design.
Recommended
Microcontroller 5V Logic Supply Rail
Many legacy 5 V microcontrollers and digital logic families (e.g., 74HC, classic AVR) require a clean, regulated 5 V supply. The XC6505B501MR-G delivers exactly that with up to 200 mA, which is sufficient for a small MCU plus a few GPIOs and indicator LEDs. Its high-speed transient response handles the abrupt load steps that digital logic generates when transceivers or timers switch states. Compared to a discrete zener + resistor regulator, the LDO provides far tighter regulation and much lower quiescent current. Place 1 uF X7R ceramics at both VIN and VOUT, within 5 mm of the IC pins.
Recommended
Post-Regulator After Switching Converter
When a switching DC-DC converter (e.g., a 3.3 V or 5 V buck) generates the bulk supply, the XC6505B501MR-G can be used as a low-noise post-regulator to clean up switching ripple on a sensitive analog or RF rail. With a fixed 5.0 V output, it directly produces a quiet rail from a higher-voltage buck output. The LDO's PSRR attenuates the switching noise, providing a cleaner rail than the buck alone. This two-stage architecture is standard for powering RF transceivers, ADCs, and precision sensors. Thermal dissipation scales with VIN - VOUT and load current, so plan thermal layout accordingly.
Recommended
USB-Powered Device 5V Rail
USB-powered devices receive a 5 V bus rail that is generally well-regulated but noisy due to hub enumeration transients and host-side switching. The XC6505B501MR-G can produce a clean 5 V output from this bus for downstream analog or RF circuitry, providing isolation from bus noise. With up to 10.5 V tolerance, it can also ride out moderate bus overshoots. For USB battery-charging applications, however, a dedicated charging IC such as the MCP73831 family is required - the LDO is for the system rail, not the charging function. This is a drop-in architecture for small USB peripherals.
Recommended
Industrial Sensor Signal Conditioning
Industrial sensor signal chains (4-20 mA loops, RTD bridges, thermocouples) require low-noise, stable supply rails for op-amps and ADCs. The XC6505B501MR-G's 5.0 V fixed output is the standard supply for many op-amp and ADC rails in such chains. Its -40 C to +105 C operating temperature grade, suitable for industrial environments, allows deployment in factory automation modules, HVAC controls, and outdoor sensor pods. The fixed output eliminates trim resistors, simplifying manufacturing. Place a ferrite bead or small LC filter on the input if the upstream rail is a long cable run.
Recommended
Portable Consumer Audio Accessory
Portable consumer audio accessories such as headphone amplifiers, Bluetooth audio dongles, and small speaker amplifiers require clean 5 V rails to maintain low audio noise floor. The XC6505B501MR-G's low quiescent current extends battery life, while its 5.0 V fixed output directly feeds analog audio stages. With up to 200 mA available, it can power a small Class-D amplifier plus a Bluetooth SoC. For higher-current audio stages (e.g., 1 A+ Class-D), use the XC6505 in parallel with a higher-current LDO or step up to a different Torex part. Battery life improves noticeably versus a discrete solution.
Recommended
Recommended Products Summary
Engineering reference data for XC6505B501MR-G — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | XC6505B331MR-G | XC6505B181MR-G | XC6504B501MR | XC6206P502MR |
|---|---|---|---|---|---|
| Brand | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor | Torex Semiconductor |
| Package | SOT-25 | SOT-25 - same | SOT-25 - same | SOT-25 - same | SOT-25 - same |
| Output Voltage | 5.0 V | 3.3 V | 1.8 V | 5.0 V | 5.0 V |
| Output Current | 200 mA | 200 mA | 200 mA | 150 mA | 200 mA |
| Operating Temperature | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +85 C (typical) | -40 C to +85 C (typical) |
Key Differentiators
- Wide 1.7 V to 10.5 V input voltage range enables single-cell Li-ion to 9 V battery operation (vs XC6206P502MR)
- Lower dropout voltage extends usable battery range (vs XC6504B501MR)
- Full -40 C to +105 C industrial operating temperature range (vs XC6206P502MR)
Design Notes
Estimated: At VIN = 10.5 V, VOUT = 5.0 V, and IOUT = 200 mA, power dissipation P_D = (10.5 - 5.0) * 0.2 = 1.1 W. The SOT-25 package has a typical theta_JA around 250 C/W on a 1-oz 2-layer board, yielding a junction temperature rise of ~275 C above ambient - far exceeding the 150 C junction limit. To stay safe, either limit continuous load to ~80 mA at full VIN/VOUT differential, drop VIN via a pre-regulator, or expand the copper thermal pad and use thermal vias. For typical 3.3 V to 5 V input applications at modest loads, no special thermal management is required.
Place 1 uF X7R ceramic capacitors on both VIN and VOUT, within 5 mm of the IC pins. Use short, wide traces to minimize parasitic inductance. The exposed copper pad under the SOT-25 package (if present on the footprint) can be tied to GND for thermal relief. Avoid routing noisy digital traces directly under the LDO to prevent output-noise coupling.
Do not exceed 10.5 V on VIN - the absolute maximum is 10.5 V and even brief transients above 12 V can damage the pass element. Do not load the output above 200 mA continuously. Some XC6505 series variants use a different CE pin polarity or NC pin assignment - always re-verify the pinout when changing fixed-voltage variants. Finally, do not omit the input capacitor: the datasheet requires it for stability and to suppress input-voltage ringing during load transients.
Compliance Information
RoHS and halogen-free compliant per the 'G' suffix in Torex part numbering. Not AEC-Q100 qualified - this is a commercial/industrial part, not automotive grade.
