The 662K is the common marking code for the XC6206 series. It is a highly precise, low power consumption, high voltage, positive voltage regulator manufactured using CMOS and laser trimming technologies. It is the “go-to” component for battery-powered devices that require a steady voltage with almost zero battery drain when the device is idle.
This guide details the 662K varieties, specifically its voltage options and technical characteristics.
Key Features of the 662K (XC6206)
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Ultra-Low Quiescent Current: Consumes only 1.0μA typical, which is significantly lower than the AMS1117.
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Low Dropout Voltage: Typically 250mV at 100mA, allowing the battery to be used until it is nearly drained.
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High Input Voltage: Can handle up to 6V to 7V (depending on the specific manufacturer).
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Current Limiting: Includes internal short-circuit protection.
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High Accuracy: Output voltage is typically within ±2%.
Voltage Varieties and Marking Codes
The “662K” mark is the most common, but because these regulators come in many fixed voltages, the marking on the chip changes slightly depending on the output. While AMS1117 uses suffixes like “-3.3V”, the XC6206 series often uses a code system.
1. Common Fixed Voltage Models
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XC6206P122 (1.2V): Used for low-power logic cores.
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XC6206P182 (1.8V): Standard for sensors and low-power MCUs.
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XC6206P252 (2.5V): Common for communication modules.
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XC6206P302 (3.0V): Used in 3V battery applications.
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XC6206P332 (3.3V): The most common 662K model, used to power 3.3V microcontrollers from LiPo batteries.
Available Packages
The 662K is designed for space-constrained applications, so it is almost exclusively found in surface-mount packages:
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SOT-23: The standard 3-pin tiny package found on almost all development boards (like the ESP32 or Arduino Pro Mini).
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SOT-89: A slightly larger package with better heat dissipation for higher current stability.
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USP-6B: An ultra-thin, leadless package for extremely small wearable devices.
HT77xx SOT-23 CAD Model HT77xx SOT-89 CAD Model
Technical Specification Overview
| Parameter | Value |
| Max Input Voltage | 6.0V – 7.0V |
| Output Current | 200mA – 250mA (Max) |
| Dropout Voltage | 160mV @ 100mA (for 3.3V version) |
| Quiescent Current | 1.0μA (Typical) |
| Output Voltage Range | 1.2V to 5.0V (Fixed) |
| Operating Temperature | -40°C to 85°C |
Pro-Tips for Stability
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Ceramic Capacitors: Unlike the AMS1117 which prefers Tantalum, the 662K works excellently with small 1.0μF to 2.2μF ceramic capacitors on both the input and output.
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Current Limits: Remember that this is a low-power regulator. It is perfect for sensors and MCUs, but cannot power motors or large LED strips (limit your load to under 200mA).
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Reverse Current: CMOS LDOs can be sensitive to reverse current. If there is a chance the output voltage could exceed the input voltage, add a small diode for protection.
Common Alternatives
RT9193, MCP1700, HT7333, ME6211