The **79D07AG-TM3-R** is a specific electronic component, typically identified as a **Negative Fixed Output Linear Voltage Regulator**. This part is part of the "79xx" family, designed to provide a stable negative voltage from a higher negative input voltage. Below is a detailed breakdown of its specifications, pinout, and characteristics. --- ### 1. General Specifications Based on the part numbering (commonly associated with manufacturers like UTC - Unisonic Technologies), here are the technical parameters: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | -7.0V (Fixed) | | **Output Current** | Up to 500mA (standard for 'D' series) | | **Polarity** | Negative | | **Package Type** | TO-251 (Short Lead/Straight Lead) | | **Mounting Type** | Through-Hole | | **Input Voltage (Max)** | -35V | --- ### 2. Part Number Breakdown To understand the specific features, we can decode the suffix and prefix: * **79**: Series identifier for Negative Voltage Regulators. * **D**: Often denotes the current rating (approx. 500mA). * **07**: Indicates the fixed output voltage (-7 Volts). * **AG**: Suffix indicating "Halogen Free" and "RoHS Compliant" status. * **TM3**: Refers to the **TO-251** package style. * **R**: Indicates the packaging method (Tape and Reel or specific orientation). --- ### 3. Pin Configuration For a negative regulator in the TO-251 package, the pinout is generally different from positive regulators (78xx series). | Pin Number | Function | Description | | :--- | :--- | :--- | | **Pin 1** | **Ground (GND)** | Reference point for the circuit. | | **Pin 2** | **Input ($V_{IN}$)** | Negative unregulated input voltage. | | **Pin 3** | **Output ($V_{OUT}$)** | Stable -7.0V regulated output. | --- ### 4. Key Features & Applications #### Features * **Thermal Overload Protection:** Automatically shuts down if the chip gets too hot. * **Short Circuit Current Limiting:** Protects the device if the output is grounded. * **Safe-Area Protection:** Ensures the internal transistor operates within safe limits. #### Common Applications * **Operational Amplifier Power:** Many Op-Amps require dual rails (e.g., +7V and -7V). * **Audio Equipment:** To provide clean power to analog signal processing stages. * **Industrial Control:** Localized on-card regulation for negative logic or sensors. --- ### 5. Typical Application Circuit When using this part, capacitors are required for stability: ```text Input (-V) ----[ C1 ]---- Pin 2 (IN) Pin 1 (GND) ---- Ground Output (-7V)---[ C2 ]---- Pin 3 (OUT) C1: 2.2uF Tantalum or 10uF Electrolytic (Input Filter) C2: 1uF Tantalum or 10uF Electrolytic (Output Stability) ```