FAMILY 01 · SIBLING COMPONENT
1.1 Stepper Motor Bobbins
Precision one-piece injection-molded stator bobbins engineered for hybrid, permanent magnet (PM), and linear stepper motors.
Explore Stepper Bobbins →Home › Products › 01 Bobbins & Insulators › Transformer Bobbins
Precision Transformer & Inductor Coil Bobbins (Down to 0.12mm Thin-Wall)
Ultra-thin-wall, high-dielectric coil formers (with optional pre-embedded terminal pins) engineered for high-frequency switching transformers, automotive ignition coils, current sensors, and industrial power supplies. Molded in UL94 V-0 LCP, PPS, PET, and Phenolic (Bakelite) for zero-flash pin sealing and 260°C+ solder-heat resistance.
✓ Down to 0.12mm Ultra-Thin-Wall Forming
✓ 260°C+ Solder-Heat Resistance
✓ Pre-Embedded Terminal Pins (Zero Flash)
PRECISION TOLERANCE
0.12mm Walls / ±0.02mm
CORE POLYMERS
LCP, PPS, PET, Phenolic
SAFETY & COMPLIANCE
UL94 V-0 · CTI ≥ 600V Available · RoHS/REACH
TOOLING & LEAD TIME
15–25 Days T1 · 7–10 Days Insert Swap
WHY POWER ELECTRONICS ENGINEERS CHOOSE RUNHENG
Maximized Winding Window Area with Extreme Thin-Wall Dielectric Safety
01. 0.12mm Ultra-Thin-Wall Molding
Using high-flow modified LCP and PPS paired with high-speed injection presses, we mold partition walls down to 0.12mm—maximizing copper winding window area without short shots or dielectric pinholes.
02. 260°C Reflow & Wave Solder Resistance
LCP, PPS, and thermoset Phenolic (Bakelite) grades withstand lead-free wave soldering and SMD reflow temperatures without pin loosening or flange blistering.
03. Zero-Flash Terminal Pin Overmolding
Precision Sodick Mirror EDM pin-hole shutoffs prevent plastic flash from creeping onto solder terminals while guaranteeing high pin pull-out retention force.
04. Strict Creepage & Clearance Control
Multi-section safety barrier ribs and precision wire-exit grooves maintain strict primary-to-secondary creepage distances for UL/IEC power compliance.
TECHNICAL SPECIFICATIONS
Transformer Bobbin Engineering Parameters
Available Base Resins
LCP, PPS, Flame-Retardant PET, PBT, PA66+GF, and Thermoset Phenolic (Bakelite)
Flame Retardancy Grade
UL94 V-0 Certified (Even at ultra-thin wall sections)
Minimum Wall Thickness
Down to 0.12mm Ultra-Thin-Wall Capability (±0.02mm Tolerance)
Solder Heat Endurance
260°C–280°C Dip / Reflow Solder Resistance (LCP / PPS / Phenolic)
Dielectric & Tracking Rating
CTI ≥ 600V Available; High Dielectric Breakdown Strength (kV/mm)
Terminal Pin Integration
Automated or Manual Insert Molding for L-Pins, Straight Pins, Gull-Wing SMD Leads & Solder Tabs
Mold Machining Standard
Swiss Charmilles Wire EDM & High-Speed Micro-Hole EDM for Pin Channels
Quality & Compliance
≤ 50 PPM; 100% Pin Coplanarity, Pull-Out Force & High-Pot Sampling; RoHS/REACH
STANDARD & CUSTOM CONFIGURATIONS
Supported Transformer & Coil Former Types
High-Frequency Switching Transformer Bobbins
EE, EI,PQ, RM, EP, and ETD core bobbins in horizontal or vertical pin layouts with multi-slot creepage barriers.
Inquire HF Bobbins →
Multi-Section Ignition & High-Voltage Bobbins
Segmented multi-chamber bobbins in PPS/LCP designed to isolate high-voltage secondary windings against corona discharge.
Request Custom Quote →
SMD Inductor & Sensor Coil Formers
Miniature 0.12mm thin-wall LCP/Phenolic bobbins with gull-wing SMD terminals requiring strict coplanarity.
Discuss Micro Bobbins →HOW WE GUARANTEE CONSISTENCY
How We Control Thin-Wall Integrity & Pin Retention
01. High-Flow LCP/PPS Rheology Control
Closed-loop oil/water mold temperature control ensures complete crystalline filling of 0.12mm thin walls without internal weld-line weakness.
02. Micro-Hole EDM & Mirror Slot Tooling
High-speed micro-hole EDM machines pin sockets to micron tolerances, preventing plastic leakage onto tin-plated brass/phosphor-bronze pins.
03. Pin Pull-Out, Coplanarity & High-Pot QC
Outgoing inspection verifies terminal pitch, SMD coplanarity, axial pin retention force, and dielectric withstand voltage.
01 / MOTOR BOBBINS & STATOR INSULATORS FAMILY
Explore Other Winding Bobbins & Coil Formers
FAMILY 01 · SIBLING COMPONENT
1.2 Servo Motor Bobbins
High-dielectric segmented and integral coil formers rated for CTI ≥ 600V and 200°C+ continuous operation in industrial servo motors.
Explore Servo Bobbins →FAMILY 01 · SIBLING COMPONENT
1.3 Brushless (BLDC) Motor Bobbins
Dynamic-balanced stator insulators with integrated airflow heat-dissipation ribs for high-speed fans, pumps, power tools, and drones.
Explore BLDC Bobbins →DIRECT ENGINEERING SUPPORT
Need Thin-Wall Transformer Bobbins or Custom Pin Layouts?
Upload or email your 2D/3D coil former drawing (STEP, IGES, DWG, PDF) or share your transformer core size. Free standard stock samples are available (freight collect), and custom DFM reviews are returned within 24 business hours.
✓ Free Standard Stock Samples (Freight Collect)
✓ 24-Hour Engineering DFM & Quote Response
✓ 100% NDA Confidentiality Protection
Send Your 2D/3D Drawing or Sample Request
Fill out the project specs below or attach your CAD files. Our engineering team responds within 24 business hours.
