Deutsch ECU PCB enclosures (made by TE Connectivity) are off-the-shelf plastic housings built to protect printed circuit boards in harsh environments like automotive, heavy machinery, rail, and industrial automation. They integrate directly with Deutsch DT and DTM connector headers, giving you a sealed, mountable package for engine control units, sensor modules, and I/O controllers.

1. Key specs at a glance

• Material: Polyamide 66 (PA66) with 15% glass fiber reinforcement (PA66 GF15), also referred to as high-temperature nylon.

• Temperature range: −55 °C to +125 °C (−67 °F to 257 °F).

• Ingress protection: IP68 and IP6K9K ratings on the enclosure; when mated with Deutsch connectors the assembly is rated IP67 (submersion to 0.9 m) and IP69K (high-pressure washdown).

• Flammability: UL 94V-0.

• Form factor: Through-hole mounting flanges on each side, optional venting, and a snap-in header interface.

2. How it works mechanically

The enclosure is essentially a rectangular box with a slide-in PCB bay and a 'cap' on one side that clicks into place to form a watertight seal. The cap accepts a Deutsch-style automotive connector (DT or DTM series), and the main housing has two mounting tabs for M8 or 1/4-inch bolts to secure it to a flat surface.

Inside, a snap-in header (DT13 or DTM13 series) solders onto the PCB at 90°, and the radial flange seal between the header and the enclosure wall provides the environmental seal. You pick the header cavity count to match your I/O needs — 12, 24, 36, or 48 positions for DT; 12 or 24 for DTM.

3. Common model: EEC-325X4B

This is the classic 4-pin aluminum PCB enclosure most often cited in datasheets and distributor listings, though it is actually molded in glass-filled nylon, not metal. Dimensions are approximately 118.8 × 133.1 × 36 mm (4.7 × 5.24 × 1.4 in), with a black PA66 GF15 body, IP68 rating, and compatibility with DTM13-12PA-R008 headers. It is widely used in:

• Construction machinery and heavy-duty vehicles: engine control units, sensor interfaces, cab controls.

• Industrial automation: PLC I/O modules, motion controllers, drives.

• Rail transportation: onboard signal processing and monitoring gear.

• Energy and outdoor equipment: wind farm instrumentation, substation monitoring.

4. Variants and ordering options

    The EEC-325X4 family comes in several versions:

• EEC-325X4A / EEC-325X4B: black, no vent.

• EEC-325X4A / EEC-325X4B with '-E016' suffix: natural/clear color (some versions use transparent PEI).

• Vented vs. non-vented: vented versions allow pressure equalization to reduce condensation risk; non-vented versions maximize ingress protection.

     There is also a larger DT-series variant, the EEC-5X650A/B, which accepts DT13 snap-in headers instead of DTM13.

5. What to watch out for

• Pin and wire sizing differs by series: DT headers accept size 16 contacts (13 A, 14–20 AWG); DTM headers accept size 20 contacts (7.5 A, 14–22 AWG). Match your header to your current and wire gauge.

• Venting trade-off: vented enclosures help prevent condensation but slightly relax the seal; non-vented enclosures give maximum IP rating but trap moisture if the internals breathe. Pick based on your thermal cycle and washdown exposure.

• Assembly rating vs. component rating: the bare enclosure is IP68/IP6K9K, but the assembled module with mated connectors is typically rated IP67/IP69K — the difference matters if you spec it for continuous submersion.

Deutsch ECU PCB enclosures are a practical choice when you need a pre-engineered, environmentally sealed housing with integrated automotive-grade connectors — especially for low-to-medium volume builds where designing a custom sealed enclosure from scratch isn't worth the cost. The EEC-325X4B with DTM13 headers covers most small-to-mid-size ECU and I/O module needs.