Here’s a complete, step-by-step execution for your CX240D5 part project.
- Review of available part information from this project
- Project name (suggests MPN): CX240D5
- Description: Solid State SPST-NO 1 Form A 4-SIP
- Pin count (from schematic): 4
- Present properties (project-level): Designator Prefix: U
- Schematic terminals present:
- No MPN property or datasheet property currently present.
- Datasheet URL
I can attach the official Sensata CX series datasheet now as the project’s Datasheet property:
- Datasheet scan and metadata (from Sensata “CX Series PCB Mount Relays” datasheet)
Features
- SIP SSR
- Ratings of 5 A @ 660 VAC
- SCR output for heavy industrial loads
- AC or DC control
- Zero-crossing (resistive loads) or random-fire (inductive loads) output
- CE compliant to EN60950-1
Input (control) specifications relevant to CX240Dx (DC control, which matches CX240D5)
- Control voltage range: 3–15 VDC
- Minimum turn-on voltage: 3.0 VDC
- Drop-out voltage: 1.0 VDC
- Typical input current: 15 mA
- Nominal input impedance: 300 Ω
- Max turn-on time: 3 ms
- Max turn-off time: 1/2 cycle
Output specifications (CX240x5 family, 240 VAC class, 5 A)
- Operating voltage (47–63 Hz): 12–280 Vrms
- Transient overvoltage: 600 Vpk
- Max off-state leakage @ rated V: 0.1 mArms
- Minimum off-state dv/dt @ max V: 500 V/μs (note: one table row showed “2 500” likely formatted as 500)
- Maximum load current: 5 Arms
- Minimum load current: 0.06 Arms
- Maximum surge current (16.6 ms): 250 Apk
- Max on-state voltage drop @ rated current: 1.4 Vpk
- I²t for fusing (8.3 ms): 260 A²s
- HP rating (UL 508/IEC60947):
- 240 VAC: 0.25 HP / 0.18 kW
General/insulation/isolation
- Dielectric strength (input-to-output, 50/60 Hz): 4000 Vrms
- Minimum insulation resistance (@ 500 VDC): 1e9 Ω
- Maximum input-to-output capacitance: 10 pF
- Ambient operating temperature: -10°C to 80°C
- Storage temperature: -10°C to 125°C
- Encapsulation: Thermally conductive epoxy
- Enclosure/PCB: Meets requirements of IEC60335-1
Pin descriptions / assignments (per wiring diagram in datasheet)
- Pin 1: LOAD (AC output terminal)
- Pin 2: LOAD (AC output terminal)
- Pin 3: CONTROL input (−DC / AC)
- Pin 4: CONTROL input (+DC / AC)
Note: “Load can be wired in location A or B” per the diagram.
Package / mechanical dimensions
- Mechanical drawing provided for the SIP package (all dimensions in inches [millimeters]).
- Stated tolerances: ±0.02 in / 0.5 mm.
- The numeric dimension values are embedded in a drawing image and could not be machine-extracted here; refer to the drawing in the linked datasheet for exact body size, lead pitch, and keepouts.
- Cross-check: schematic symbol and footprint vs. datasheet
Schematic symbol vs. datasheet pinout
-
AC load pins:
- Project: AC_A is pin 1, AC_B is pin 2.
- Datasheet: Pins 1 and 2 are the AC LOAD terminals.
- Status: Consistent.
-
Control pins:
- Project: DC is pin 3, and -DC is pin 4.
- Datasheet: Pin 3 is −DC (negative control), Pin 4 is +DC (positive control).
- Status: MISMATCH. The control polarity is swapped in the schematic:
- Should be pin 3 = −DC and pin 4 = +DC.
- Project currently has pin 3 = +DC and pin 4 = −DC.
- Risk: High. This will reverse-bias the LED input of the SSR and can prevent turn-on, damage the input, or cause test/field failures. Must be corrected.
Footprint/PCB vs. mechanical drawing
- PCB structure shows a single default footprint container with 4 pads named after the terminals (no defined body outline or dimensioned pad pattern). No board stackup or defined package dimensions are present.
- Datasheet provides a SIP-4 mechanical drawing with defined tolerances; exact pad pitch/spacing and body outline must match for proper fit.
- Status: INCOMPLETE/UNVERIFIED.
- No verified SIP-4 pad pitch, pin-to-pin spacing, courtyard, or body outline in the PCB data.
- Pin 1 orientation and package polarity marking cannot be confirmed from the current PCB node set.
- Risks:
- Incorrect pin pitch or hole/land sizing can cause assembly fit issues.
- Ambiguous pin 1 orientation can lead to 180° placement errors.
- Lack of courtyard and body outline can impact DFM/inspection.
Recommendations to resolve mismatches
-
Schematic:
- Swap control pin numbering to match the datasheet:
- Pin 3: −DC (negative control)
- Pin 4: +DC (positive control)
- Keep LOAD pins 1 and 2 as is.
-
PCB footprint:
- Implement a proper SIP-4 footprint per the datasheet drawing:
- Correct pin pitch and spacing for all 4 leads.
- Define body outline and courtyard.
- Mark pin 1 clearly on silkscreen and/or assembly layer.
- Verify pad sizes/holes to the manufacturer’s recommended land pattern or through-hole/surface variant as applicable.
If you want, I can:
- Set the Datasheet property to the official Sensata CX Series PDF now.
- Then update the schematic symbol’s pin assignments and prepare a correct SIP-4 footprint aligned to the datasheet.