Automotive Solenoid Coil & Valve Solutions
IATF-capable solenoid coils and valves for automotive thermal, HVAC, pneumatic brake and auxiliary fluid circuits. Designed for heat soak, vibration and voltage dip — not catalogue 12 V coils.
Applications
Product Highlights
Technical Specifications
| Parameter | Value |
|---|---|
| System Voltage | 12 V / 24 V nominal, designed to voltage dip |
| Duty | Continuous, PWM or pulsed — specify ED |
| Typical Circuits | Coolant, HVAC, pneumatic brake, auxiliary fluid |
| Environment | Heat soak, vibration, glycol / air / oil as specified |
| Insulation | Class F / H as required by ambient |
| Connector | Custom automotive / DIN / flying lead |
| Quality | IATF 16949, PPAP, traceability, change control |
| Customization | Voltage, power, envelope, connector, mounting |
OEM engineering brief
Application Engineering Guide
Automotive and EV thermal programs do not buy a catalogue 12 V coil. They buy a part that still pulls in after heat soak, vibration and voltage dip, and that can be repeated under IATF change control. This is the brief we use with OEM and Tier-1 teams.
Name the circuit first
- Thermal / coolantBattery, inverter and cabin loops. Glycol mix, high duty, aggressive ambient.
- HVAC actuatorsTight envelope, low noise, often PWM.
- Pneumatic brake / auxiliary airFast switching, contamination, wide voltage range.
- Auxiliary fluidWasher, suspension, locker, oil. Each has its own seal and cleanliness spec.
Coolant and cabin-air coils almost never share a winding spec even when both are 12 V.
What belongs on the RFQ
- Voltage window12 V or 24 V nominal, plus jump-start and dump limits. Design to the dip.
- DutyContinuous, PWM or pulses. 100% ED is a different copper stack than a parking-brake pulse.
- TemperatureUnder-hood or under-pack numbers, not cabin.
- Force at hot resistanceStroke, pull-in after heat soak, residual magnetism after key-off.
- Sealing & vibrationConnector, IP, salt, glycol compatibility.
- Quality packageIATF 16949, PPAP, IMDS, change control, traceability.
Why “same voltage, same size” fails
- Heat soakHot resistance rises, force falls, valve does not crack open.
- VibrationBobbin or encapsulation creeps; the winding abrades.
- Connector stack-upIP-rated on the bench, leaks after cable OD and gasket change.
- Residual magnetismHolds a hydraulic or air valve slightly open after key-off.
We validate temperature rise and pull-in on the intended tube/armature, not on a generic C-frame.
OEM path
- Prototype — envelope, winding and connector frozen against your drawing.
- DVP — environmental tests on your fixture.
- Process — FMEA, control plan, lot traceability.
- SOP — same revision rules a Tier-1 expects.
FAQ
Do you have IATF 16949?
Yes. Ask for the current certificate and the plant that will run your part — certificates are site-specific.
Can you reverse-engineer a Tier-1 sample?
We can measure envelope, resistance, turns and connector, then propose an equivalent. Production release still needs your drawing.
12 V EV vs 12 V ICE — same coil?
Often no. Ambient, coolant-valve dwell time and PWM differ. Treat them as two applications that share a voltage class.
What kills coils in warranty?
Over-temperature, ingress at the connector, and voltage drop at pull-in. Share the worst-case voltage and enclosure thermal model early.
Send circuit, voltage window, temperature, force/stroke, connector and SOP volume to cici@solenoidcn.com. Hardware: coil series.
Have a drawing or sample?
Send voltage, media, pressure, duty and annual volume. We reply with a DFM note, not a catalogue dump.
Other OEM Applications
Related Industries
Same factory, different circuits. Open another application page if your machine is not the one above.
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Frequently Asked Questions
Professional answers for OEM/ODM and technical requirements from our engineering team.
OEM / ODM
Can you customize voltage and dimensions?
Do you support OEM/ODM projects?
Can you develop based on our drawings or samples?
Technical
What insulation classes are available?
What protection grades are supported?
Can the coils work continuously (100% ED)?
Technical Support
Engineering team ready to assist your project
At a Glance
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Need a Custom Solution?
Our engineering team can help with OEM/ODM projects and technical requirements. Over 20 years of experience in solenoid coil design and manufacturing.
Customization Options
Customization Notes:
Send circuit name, voltage window, ambient/media temperature, force/stroke, connector, SOP volume and quality package. Plant-specific IATF certificate on request. Email: cici@solenoidcn.com