What This Heatsink Does and Why It Matters This Thyristor Rectifier Heatsink is a CNC-machined aluminum or copper component that mounts directly under your thyristor module to pull heat away from the
Get a quote
-
English
- sc@bquq.com
What This Heatsink Does and Why It Matters This Thyristor Rectifier Heatsink is a CNC-machined aluminum or copper component that mounts directly under your thyristor module to pull heat away from the
This Thyristor Rectifier Heatsink is a CNC-machined aluminum or copper component that mounts directly under your thyristor module to pull heat away from the junction. We hold flatness to 0.02 mm and surface finish to Ra 1.6, which cuts thermal resistance by up to 18% compared to a standard extruded profile.
Every unit ships from our Dongguan factory in 12 days, not 30. Hardness on aluminum is T6 (85 HB minimum), on copper is half-hard (80 HB). That means no warping after thermal cycling, no rework on your assembly line.
Aluminum gives you lower cost and lighter weight—good for air-cooled rectifiers under 100 A. Copper gives you 1.7x higher thermal conductivity (401 W/m·K vs 167 W/m·K)—use it for water-cooled or high-current stacks above 200 A.
For mixed loads, we machine a copper base with aluminum fins, bonded via friction stir welding. That hybrid structure reduces weight by 40% while keeping heat spread performance at 95% of pure copper. Tell us your current density and cooling method; we will recommend the correct material pair.
Fins on a thyristor heatsink are the weak point—thin, tall, and easily deformed. We use a 4-axis CNC with a custom 3-flute end mill running at 18,000 RPM and a chip load of 0.05 mm/tooth. That gives a fin thickness tolerance of ±0.05 mm and a burr height under 0.03 mm.
We do not use a standard vise. Instead, we clamp the base plate from the bottom using a vacuum fixture, so there is zero deflection on the fins during cutting. After machining, we deburr each fin edge with a 0.2 mm chamfer, then tumble the part for 20 minutes to remove micro-burrs. You will not need secondary cleaning before assembly.
If you are designing the fin geometry yourself, check our CNC cutting tool selection guide to see how tool diameter affects minimum fin pitch.
A thyristor module transfers heat through its baseplate. If the heatsink surface is not flat, the air gap acts as an insulator—your junction temperature rises 10-15°C.
We machine the mounting surface on a dedicated lapping step after CNC. Result: flatness of 0.02 mm over 100 mm length, and a surface roughness of Ra 1.6. For critical applications, we can go to Ra 0.8 with an extra polishing pass.
Holes for thyristor screws (M4, M5, M6) are drilled and tapped with a tolerance of 6H. Position tolerance between holes is ±0.05 mm. We also add counterbores per IEC 60747-15 specification, so your module sits flush without rocking.
We test each heatsink design on a thermal test rig with a 120 W power resistor before we ship the first batch. For a standard 6061-T6 aluminum heatsink with 10 fins (height 25 mm, base 12 mm), the thermal resistance is 0.45 °C/W at 2 m/s airflow. For copper, the same geometry gives 0.28 °C/W.
If you need a specific thermal resistance value, send us your airflow rate, ambient temperature, and thyristor power dissipation. We will run a CFD simulation (free, within 48 hours) and send you the temperature map. No guesswork.
Every heatsink goes through a CMM (coordinate measuring machine) check for the critical dimensions: base thickness, fin height, hole positions, and surface flatness. We record these values on a certificate of conformance that ships with the box.
Additionally, we do a 100% visual inspection under a 2x magnifying lamp for scratches, dents, and discoloration on the mounting surface. If the surface finish is Ra > 1.6, we reject it—no exceptions.
For orders above 500 pieces, we include a random sample thermal test report from our in-house rig. The report shows the actual temperature rise at 80 W, 100 W, and 120 W. This is not a simulation—it is measured.
We only use extruded and drawn stock from certified mills. Aluminum is 6061-T6 or 6063-T5 (if you need better corrosion resistance). Copper is C11000 (ETP) with a minimum conductivity of 101% IACS.
After machining, aluminum parts go through a T6 aging treatment at 175°C for 8 hours to stabilize the structure. This prevents stress relief during your soldering or mounting process. Copper parts are annealed to half-hard to avoid work hardening from the machining process.
Hardness is controlled on every batch: 6061-T6 is 85 HB minimum, C11000 half-hard is 80 HB. We use a portable hardness tester on 5% of parts per batch. If the average hardness drops below spec, we re-treat the batch.
| Parameter | Value | Notes |
|---|---|---|
| Material Options | 6061-T6 Al, 6063-T5 Al, C11000 Cu | Hybrid Cu/Al available |
| Base Plate Thickness | 6 mm - 25 mm | Custom per drawing |
| Fin Height | 15 mm - 60 mm | Up to 80 mm with special tooling |
| Fin Thickness | 1.5 mm - 4 mm | Tolerance ±0.05 mm |
| Hardness (Al) | 85 HB min (T6) | Per ASTM B221 |
| Hardness (Cu) | 80 HB min (half-hard) | Per ASTM B187 |
| Flatness (Mounting Surface) | 0.02 mm over 100 mm | Lapped after CNC |
| Surface Finish (Ra) | 1.6 µm standard, 0.8 µm optional | Mounting surface only |
| Hole Position Tolerance | ±0.05 mm | 6H thread class |
| Runout (Overall) | 0.05 mm (TIR) | Measured on CMM |
| Lead Time | 12 days (first article 7 days) | From drawing approval |
| MOQ | No MOQ | 1 piece for proto, 100+ for production |
For a deeper dive into how we hold these tolerances, read our CNC machining tolerances guide—it explains the difference between standard and precision classes.
No MOQ. We machine one prototype for you at the same quality as a 1000-piece run, so you can validate the thermal design before committing to volume.
Yes—send us the module datasheet or a drawing with the hole coordinates, and we will adjust the CNC program and tapping sequence to match exactly.
We use a CMM for flatness (0.02 mm) and a thermal test rig with a 120 W resistor for resistance measurement, both recorded on a certificate of conformance.
Standard lead time is 12 days from drawing approval, but we can expedite to 8 days with a 15% surcharge if your line is down.
Send us your drawing (PDF, STEP, or IGES) with the thyristor part number and cooling method. We will reply with a firm price per unit, thermal simulation results, and a delivery date—all within 12 hours on business days.
Email the drawing to sc@bquq.com or send it via WhatsApp at +86 13713157787. This is precision manufacturing from a 20-year factory in Dongguan, China—no MOQ, no hidden tooling fees, no excuses.
Your thyristor runs cooler. Your assembly line runs faster. Your customer sees fewer field failures. That is the point.
| Parameter | Capability |
|---|---|
| Materials | AL6063/6061/5052, pure copper C1100, copper-aluminum composite |
| Process | Extrusion, CNC machining, skiving, forging, die casting, stamping fins |
| Fin Types | Extruded, pin fin, skived, folded, bonded, heat pipe, vapor chamber |
| Surface | Black anodizing, clear anodizing, nickel plating, powder coating |
| Size Range | Max 1500 x 400 x 300 mm |
| Thermal Test | Thermal resistance and heat dissipation data per batch |
| Prototype | 5-7 days, no MOQ on samples |
| Inspection | CMM, thermal resistance tester, full report per batch |
