How should engineers use the published current rating when designing traces?

Treat the published current rating as a tested baseline with specified ΔT and loading. Apply derating (typically 80%) for constrained thermal environments and validate with thermal imaging.

Which mechanical dimensions are critical to verify before panel fabrication?

Verify pin-to-pin pitch, solder-pin length/diameter, body-to-board clearance, and overall mating height. Confirm tolerances of ±0.1 mm where fit is critical.

47745-0100 Spécifications complètes : brochage, courant, dimensions

Q: How do I handle flammability and environmental requirements for 47745-0100?

Ensure the PCB substrate meets UL 94 V-0 requirements and that the reflow profile adheres to the connector's peak temperature tolerance to prevent housing deformation.

2026-05-23 31

Connectors with mixed terminal sizes now commonly appear in automotive and industrial boards — misreading a single current rating can cause a 40°C temperature rise in a fully loaded connector. This article references part 47745-0100, provides a clear pinout and verified current rating guidance, mechanical dimensions, and practical design and verification tips for reliable board-level integration.

Background & Quick Overview of 47745-0100

47745-0100 Hybrid Connector Technical Overview

What this part is and where it’s used

Point: This family is a hybrid wire-to-board header combining multiple contact sizes in a single housing for mixed power and signal connections. Evidence: Typical use cases include automotive harness interfaces, power+signal gateways, and industrial control boards. Explanation: Designers choose these headers when space and a single mating interface must carry both low-level signals and higher currents without separate connectors.

Pinout & Electrical Interface

Point: Establish a consistent pin-numbering convention: define orientation as PCB top view with mating face toward the silkscreen reference. Evidence: Recommended silkscreen labeling shows row/column and net name with pin numbers adjacent to pads. Explanation: A simple pinout table simplifies BOM, assembly, and in-circuit test mapping.

Pin #	Terminal Type	Typical Use	Max Current (A)
1-12	Small CP	Signal (LIN, CAN, Logic)	2.5
13-24	Mid CP	Low-power VCC / Sensors	12.0
25-28	Large CP	Main Power Rails	21.0

Current Ratings & Thermal Behavior

Point: Present published current ratings by terminal size with clear test conditions. Evidence: For this family, ratings are typically based on a ΔT = +40°C rise. Explanation: Always display test conditions to avoid overrating traces or vias.

Terminal Size	Wire Gauge	Max Continuous (A)	Condition
Small CP	24–28 AWG	2.5	Fully loaded, ΔT=40°C
Mid CP	18–22 AWG	12.0	Fully loaded, ΔT=40°C
Large CP	12–16 AWG	21.0	Fully loaded, ΔT=40°C

Mechanical Dimensions & PCB Mounting

Point: Include pitch, solder-pin length, and critical tolerances in your design files. Evidence: Key tolerances are typically ±0.1 mm for pin spacing. Explanation: Documenting critical dimensions ensures mechanical compatibility and accurate keepout areas.

Pitch: High-density spacing for signals, wider for power.
Soldering: Use expanded copper pads and thermal vias for 21A pins.
Retention: Check for mechanical snap-fit or solder-down lugs.

Selection Checklist & Verification

Pinout Clarity: Map pins on PCB top-view with net names to reduce errors.
Current Derating: Apply 80% rule for constrained thermal cases.
Footprint: Prioritize pin-to-pin spacing and body clearances.
Testing: Run high-current soak and thermal imaging on prototypes.

Summary

Confirm the 47745-0100 pinout early, treat published current ratings as baselines with derating applied, and verify critical mechanical dimensions. Before final release, validate the exact variant against the official datasheet and run prototype thermal tests.

FAQ

What is the recommended way to document the 47745-0100 pinout?

Document the pinout as a table and a silkscreened top-view diagram showing pin numbers, terminal types, and net names. Include a machine-readable CSV for ATE fixtures and add clear polarity marks on the PCB silk to prevent mis-mating.

How should engineers use the published current rating?

Treat the published current rating as a tested baseline. Apply derating (e.g., 80% of rated current) for constrained thermal environments, design adequate copper cross-sections, and validate with thermal imaging under expected load.

Which mechanical dimensions are critical to verify before fabrication?

Verify pin-to-pin pitch, solder-pin length/diameter, body-to-board clearance, and mating height. Confirm tolerances (typically ±0.1 mm) and check keepout areas for mating connectors.

How do I handle flammability and environmental requirements?

Ensure the PCB substrate meets the required UL 94 V-0 class and that the reflow profile adheres to the connector's peak temperature tolerance to prevent housing deformation during assembly.