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DF5A-6DP-5DSA - 5mm Pitch 6-Pin Dual Row Through-Hole Header | Hirose
The Hirose DF5A-6DP-5DSA is a 6-position (2 rows × 3 contacts) through-hole male pin header from the Hirose DF5 series, designed as a miniature potting connector for secondary power supply applications. It uses a 5.0 mm pitch contact geometry and stands 22.5 mm above the PCB mounting surface, with a maximum potting allowance of 9 mm, making it suitable for encapsulated power modules. The header accepts the DF5 series crimp socket housings and is supplied in straight (vertical) orientation with a tin-plated contact finish. A pin header is a single-row or multi-row array of male contacts pressed or soldered through a printed circuit board, providing a polarized, removable mating interface for wire-to-board and board-to-board power or signal connections. Within the broader interconnect hierarchy, pin headers sit under rectangular board connectors (Headers, Male Pins), which in turn belong to the wire-to-board connector family used throughout power management, industrial control, and appliance electronics. Pin headers are the lowest-cost method to bring power rails or low-speed signals off a sealed PCB, and the potting-friendly DF5 series specifically targets encapsulated power supplies and motor-drive modules. Key features include a 5.0 mm contact pitch, 6 contacts arranged in two rows of three, tin-plated brass contacts for solderability and corrosion resistance, and a glass-fiber reinforced thermoplastic insulator rated for reflow soldering and potting compound exposure. The mating interface accepts standard DF5 series receptacle housings with crimp-terminated discrete wire or ribbon cable. The connector is rated for up to 8 A per circuit at 500 V AC/DC depending on wire gauge. The DF5A-6DP-5DSA uses a polarized housing with positive locking latches that engage with the corresponding crimp socket housing. The 5 mm pitch is larger than signal-density headers (typically 2.54 mm), making this part optimized for power applications where creepage, clearance, and current-carrying capacity take priority over contact density. The straight-through mount orientation enables wave soldering during PCB assembly. Typical applications include secondary-side power supplies in industrial equipment, encapsulated power modules, HVAC control boards, appliance motor controllers, and LED lighting drivers. The 5 mm geometry also suits battery management wiring harnesses where larger gauge conductors (AWG 18 to AWG 22) are used for current-carrying capability rather than fine-pitch signal routing. When designing with this part, ensure the PCB through-hole pad diameter matches the 1.5 mm nominal pin diameter, maintain 22.5 mm clearance above the board for mating receptacle engagement, and confirm the maximum potting compound depth (9 mm) is not exceeded when the header is potted inside an enclosure. This page synthesizes Hirose catalog specifications, distributor pricing and stock from DigiKey and Mouser, drop-in alternative connectors, and PCB layout guidance that is not consolidated in the standalone manufacturer datasheet.
KSZ8895RQ - 5-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip KSZ8895RQ is a low-power, highly integrated 5-port 10/100BASE-T/TX Layer-2 managed Ethernet switch with MII/RMII host interface, housed in a 128-pin PQFP (14x20 mm) package. Headline parameters include five integrated 10/100 Ethernet PHYs, full Layer-2 managed switch functionality with QoS and VLAN support, and a 1.14V to 3.465V supply range for digital I/O (core analog powered by an internal LDO). What is a managed Ethernet switch IC? A managed Ethernet switch IC is a single-chip device integrating multiple physical layer transceivers (PHYs), a Layer-2 switch fabric, and a management interface (typically SPI, I2C, or MDIO). In the system hierarchy, it sits above individual PHY transceivers, combining switching and management to reduce BOM cost and PCB area compared with discrete PHY-plus-MAC designs. It enables traffic prioritization, VLAN tagging, and port-level control required in industrial, automotive, and broadband access applications. Key features include five integrated 10/100BASE-TX PHYs with HP auto-MDI/MDIX cable-polarity correction, advanced switch engine supporting 802.1Q VLAN and 802.1p QoS priority queuing, SPI and I2C management interfaces, an MII/RMII for connection to an external host MAC, and an energy-efficient Ethernet mode for power-saving link-down/idle states. The device operates from a single 3.3V supply with a low typical power consumption. The KSZ8895RQ leverages Micrel's physical transceiver and switch silicon, combining a robust DSP-based analog front-end with a shared memory switch fabric to deliver non-blocking wire-speed switching on all five ports. Internal PHY termination resistors simplify board layout, and per-port link/fault LEDs are supported through a GPIO/LED interface. The architecture supports store-and-forward switching with up to 1K-entry MAC address table per port group. Typical applications include industrial Ethernet switches and gateways, IP cameras and surveillance equipment, broadband CPE routers, automotive Ethernet backbone switches (the family is AEC-Q100 qualified for the MQI/RQI variants), and embedded networked control systems requiring five wired Ethernet ports. When designing with this device, follow the reference schematic for the center-tap magnetic connection and place the 1.8V decoupling network close to the chip because the internal regulator powers the analog core. Verify that the SPI/I2C selection pin state matches firmware expectations at reset. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found on a single manufacturer product page.