The **88C34L-AF5-R** is a low-power, high-precision voltage detector integrated circuit (IC) commonly used for system monitoring and reset generation. It is typically manufactured by UTC (Unisonic Technologies). --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its behavior and physical characteristics: | Parameter | Details | | :--- | :--- | | **Part Number** | 88C34L-AF5-R | | **Function** | Voltage Detector / Reset IC | | **Detection Voltage** | 3.4V (Fixed) | | **Output Type** | CMOS Output (Active Low) | | **Package Type** | SOT-25 (AF5) | | **Operating Temperature** | -40°C to +85°C | | **Supply Current** | Very Low (typically ~1μA to 3μA) | --- ### 2. Key Features * **High Accuracy:** Usually provides ±2% detection voltage accuracy. * **Low Power Consumption:** Designed for battery-operated devices to extend life. * **Hysteresis Characteristics:** Built-in hysteresis prevents "chatter" or unstable switching when the monitored voltage is near the threshold. * **Small Footprint:** The SOT-25 package is ideal for space-constrained PCB designs. --- ### 3. Pin Configuration (SOT-25) While you should always verify with the specific datasheet, the standard layout for this series is as follows: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **OUT** | Reset Output (Active Low) | | 2 | **VDD** | Input Voltage / Power Supply | | 3 | **VSS** | Ground (GND) | | 4 | **NC** | No Connection | | 5 | **NC** | No Connection | --- ### 4. Typical Application Circuit The 88C34L is used to ensure a microcontroller (MCU) or microprocessor starts only when the power supply is stable. ```mermaid graph LR VCC(Power Supply) --> VDD[88C34L VDD Pin] VDD --> OUT[OUT Pin] OUT --> RESET[MCU Reset Pin] VSS[VSS Pin] --> GND(Ground) ``` --- ### 5. Part Number Decoding * **88C**: Series identification (Voltage Detector). * **34**: Detection voltage (3.4 Volts). * **L**: Lead-free/Halogen-free. * **AF5**: Package code for SOT-25. * **R**: Tape and Reel packaging.