9-Position Right-Angle D-Sub with Board Locks — What You're Getting
The TE Connectivity AMPLIMITE HD-20 5748979-1 is a 9-position D-Sub receptacle with female sockets, laid out in 2 rows in the standard DE-9 (E) shell size. The 30.0µin gold contact finish is the real workhorse here — it's not a thin flash that wears off after a few cycles. At that thickness, the contacts handle repeated mating and unmating in field-service scenarios without the base phosphor bronze oxidizing. Board locks on each end of the shell are the detail that saves a rework ticket. A right-angle D-Sub takes mechanical leverage from the mating cable — without those locks, the solder joints bear the full shear load during mating and vibration. The locks anchor the shell to the PCB so the solder tails only carry signal current, not strain.
Voltage, Temperature, and the Backset Spacing
Rated 125V, which covers most low-voltage DC and AC signal applications — serial data lines, instrumentation, control signals. The 0.318" (8.08mm) backset spacing is the dimension from the PCB edge to the mounting face of the connector. That matters when you're fitting this into a cutout in a metal panel or enclosure — the connector body sits back from the board edge by that distance, so the panel cutout location has to account for it. A standard DE-9 footprint with the right backset keeps the screwlocks accessible.
Mating Half and Pinout Reality
This receptacle mates with a standard E shell size D-Sub plug — the male connector with pins. The flange feature is a mating-side female screwlock with 4-40 threads, so the mating plug needs the corresponding male 4-40 screwlock hardware to secure the pair. Without the screwlocks tightened, the right-angle solder joints take the cable strain. Pinout for a DE-9 D-Sub is defined by the TIA-574 or RS-232 standard: pin 1 is typically DCD, pin 2 RXD, pin 3 TXD, pin 4 DTR, pin 5 GND, pin 6 DSR, pin 7 RTS, pin 8 CTS, pin 9 RI. That's the standard assignment — verify against your specific circuit schematic before committing the BOM line.