The “Cold Plate Four-Pass Heat Sink” listing refers to the OHMITE CP4A-114A-108E, a liquid-cooled plate listed with an aluminum body and copper tubing exposed at the device-mounting surface. Newark lists its thermal resistance as 0.43 °C/W and its dimensions as 152.4 × 114 × 19.05 mm. Those are catalog specifications, not a complete system-performance guarantee; the available listings do not state the test conditions or key coolant and pressure limits.
What is the OHMITE CP4A-114A-108E?
It is a liquid cold plate heat sink identified by distributors as a four-pass model. Newark describes an aluminum 6063-T5 plate with 0.375-inch-OD copper tubing, nominally 0.05-inch wall thickness, exposed on the mounting surface. Richardson RFPD also lists the configuration as 4-pass. The product pages do not show the internal channel drawing, so “four-pass” identifies the listed configuration but does not establish the precise flow routing or its pressure and temperature behavior. Newark product listing; Richardson RFPD product listing.
Published specifications
| Specification | Published listing |
|---|---|
| Model | OHMITE CP4A-114A-108E |
| Configuration | Four-pass, according to Richardson RFPD |
| Construction | Aluminum 6063-T5 plate with exposed copper tubing at the mounting surface; Newark lists tubing as 0.375-inch OD with nominal 0.05-inch wall |
| Dimensions | Newark: 152.4 mm wide × 114 mm long × 19.05 mm high. Richardson RFPD lists plate length as 114.3 mm (4.5 in), a small rounding difference. |
| Thermal resistance | 0.43 °C/W, as listed by Newark; test conditions are not stated on the retrieved product page. |
| Package reference | Newark lists SOT-227 among packages cooled. |
These are distributor-listed values. Confirm the current OHMITE datasheet before using them for mechanical design or thermal calculations. In particular, do not treat the 0.43 °C/W figure as a guaranteed device-to-coolant or system thermal result without its measurement definition and test setup. Newark product listing; Richardson RFPD product listing.
Where the CP4 family is used
Mouser describes OHMITE CP4 cold plates as intended for heatsinkable resistor packages including TAP600, TAP800, TA1K0, and TA2K0. Newark describes the broader CP series in applications involving SCRs, rectifiers, diodes, thyristors, and other high-power semiconductor devices. These family-level references do not prove that every listed package shares a mounting pattern compatible with the CP4A-114A-108E. Check the device outline, hole locations, contact surface, and mounting hardware against the current manufacturer documentation. Mouser OHMITE heatsinks page; Newark product listing.
#1 Best Overall
What to verify before specifying or installing it
The available product listings do not establish the following engineering details. Obtain them from the current OHMITE datasheet or manufacturer support rather than assuming values typical of other cold plates:
- Approved coolant chemistry and corrosion limits for the aluminum-and-copper construction.
- Required or allowable flow range, pressure drop, and maximum pressure rating.
- Fitting type, connection details, and whether fittings are supplied.
- Maximum operating temperature and the conditions associated with the listed thermal resistance.
- Internal channel routing and any resulting flow-distribution or pressure tradeoffs.
- Exact device-package compatibility, mounting pattern, and required interface materials.
A distributor-associated thermal joint compound is not evidence of an included accessory or universal compatibility. Choose an interface material only after checking the device and compound instructions and the manufacturer’s mounting guidance. Newark product listing; Richardson RFPD product listing.
Rank #2
How to compare it with another cold plate
Use the same application-specific criteria for both parts; a matching footprint alone is not enough to establish suitability.
- Check package and mounting compatibility. Compare the actual device drawing and hole pattern with the plate and mounting instructions.
- Compare envelope dimensions. Account for width, length, height, tubing exposure, fittings, and available clearance.
- Interpret thermal resistance carefully. Compare only figures with known definitions and equivalent test conditions; the CP4A-114A-108E listing provides 0.43 °C/W but the retrieved page does not state those conditions.
- Match coolant and hydraulic requirements. Confirm chemistry, flow, pressure drop, pressure rating, and connections for the intended loop.
- Confirm configuration and procurement details. Obtain a channel drawing, customization options, and current availability directly from the manufacturer or supplier.
The product-family context and the distributor specifications are documented, but the listed pages do not provide enough information to make a like-for-like engineering comparison on coolant performance or pressure capability. Mouser OHMITE heatsinks page; Newark product listing.
Quick Recap
Rank #3
- 1. Product Name: Heat sink Cooling Fin; Material: Aluminium; 310g /pc （Sufficient materials only for excellent quality）
- 2. Size: 5.9 x 3.66 x 0.59 inch / 150 x 93 x 15mm (L*W*H)
- 3. The Quantity of fins: 294pcs; Base board thickness:4.3mm, Fins board thickness:2mm; Color:Black. The fins increase the area of the board and thus provide for greater heat transfer.
- 4. This large big aluminum heatsink is passive cooling, reduces the risk of hardware failure and power loss due to overheating, more safety.
- 5. Widely used in Computers GPU HDD etc., for Power Transistors, FETs, ICs, Power Amplifiers, Docking Station, Wifi Routers, Voltage Regulators, MOSFETs, SCRs, FET, IC etc
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
