## Overview of the DF1B-R2 The **DF1B-R2** is a specific electronic component within the **Hirose DF1B Series**. It is a discrete wire-to-board connector accessory, specifically a **Contact Retention/Secondary Lock** (often referred to as a "Retainer"). These parts are designed to ensure that the crimped contacts remain securely seated within the connector housing, preventing "terminal back-outs" in high-vibration environments. --- ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Series** | DF1B | | **Component Type** | Retainer (Secondary Lock) | | **Number of Positions** | 2 | | **Pitch** | 2.50 mm | | **Material** | Polyamide (Nylon) | | **Flammability Rating** | UL94V-0 | | **Color** | White / Natural | | **Operating Temperature** | -35°C to +85°C | --- ### Key Functions & Applications 1. **Terminal Assurance:** Once the crimped wires are inserted into the DF1B housing, the DF1B-R2 is snapped over the back. It acts as a physical barrier that prevents the terminals from being pulled out. 2. **Vibration Resistance:** Ideal for industrial machinery or automotive electronics where constant movement might loosen standard friction-fit pins. 3. **Circuit Polarization:** Helps in maintaining the alignment of the wires entering the housing. ### Compatible Components To use the DF1B-R2, you typically need the corresponding housing and contacts from the same series: * **Housing:** DF1B-2S-2.5R (Socket Housing, 2-position) * **Contacts:** DF1B-2022SC (Female crimp terminals) * **Headers:** DF1B-2P-2.5DS (Right angle or straight pin headers) --- ### Installation Diagram Concept ```text [ Crimp Terminal ] --> [ DF1B Housing ] | [ DF1B-R2 Retainer ] <-- Locks into place ```