E2A-T220-25E
Heat Sink, 16.4 °C/W, TO-220, 16.3 mm, 25.4 mm, 16.3 mm
- Manufacturer: OHMITE
- Product type: Natural Convection Heat Sinks
- SVHC: No SVHC (27-Jun-2024)
- Product Range: 0
- Packages Cooled: TO-220
- Heat Sink Material: Aluminium
- Thermal Resistance: 0
- External Width - Metric: 16.3mm
- External Height - Metric: 25.4mm
- External Length - Metric: 16.3mm
- External Width - Imperial: 0.64"
- External Diameter - Metric: -
- External Height - Imperial: 1"
- External Length - Imperial: 0.64"
- External Diameter - Imperial: -
| Delivery and price | |
|---|---|
| Units per pack | 250 |
| Price | 1.33 € |
| Current stock | 10+ |
| Lead time | 30 days |
## **EX Series Heatsinks For TO-220 and TO-247 devices and bridge rectifiers** ## **F E a t u r E S** - Vertical through-hole PCB mounting - E3A-T220-25E has a 8-32 threaded mounting hole for a bridge rectifier in a D34 type square package - The thickened side fins can be used to secure the heat sink to a side wall or to mount TO-220"s - • Threaded mounting holes |**For**<br>**Ohmite**<br>**Surface**<br>**Thermal**<br>~~**S E r i E S S P E c i F i c at i O N S**~~<br>~~Se~~|**For**<br>**Ohmite**<br>**Surface**<br>**Thermal**<br>~~**S E r i E S S P E c i F i c at i O N S**~~<br>~~Se~~|**For**<br>**Ohmite**<br>**Surface**<br>**Thermal**<br>~~**S E r i E S S P E c i F i c at i O N S**~~<br>~~Se~~|**For**<br>**Ohmite**<br>**Surface**<br>**Thermal**<br>~~**S E r i E S S P E c i F i c at i O N S**~~<br>~~Se~~|**For**<br>**Ohmite**<br>**Surface**<br>**Thermal**<br>~~**S E r i E S S P E c i F i c at i O N S**~~<br>~~Se~~|**For**<br>**Ohmite**<br>**Surface**<br>**Thermal**<br>~~**S E r i E S S P E c i F i c at i O N S**~~<br>~~Se~~| |---|---|---|---|---|---| |**Heatsink**|**Package**|**Resistor**|**Area**|**Weight**|**Resistance***| |**Part Number**|**Type **|**Series**|**(in2 /mm2)**|**(oz./g)**|**(°C/W)**| |E2A-T220-38E|TO-220|TBH,TCH|7.96 / 5129|0.40 / 11.21|14.0| |E2A-T220-25E|TO-220|TBH,TCH|5.30 / 2419|0.26 / 7.5|16.4| |E2A-T247-38E|TO-247|TEH100|7.95 / 5129|0.40 / 11.21|14.0| |E3A-T220-25E|D34||9.4 / 6064|0.60 / 17.0|12.4| *Natural convection at 5W dissipation ## ~~**c H a r a c t E r i S t i c S**~~ **Heat sink** Aluminum 6063-T5 or equivalent with either black anodized or degreased finish **Solder feet** steel tin plated **Interface** for improvement, use thermal **thermal** joint compound or 0.005 **resistance** Grafoil (TGon 800 by Laird) ~~—_— ee~~ **Interface** Sil-Pad 900S by Bergquist or **electrical** equivalent **isolation** ## **Heat Dissipation** **==> picture [229 x 159] intentionally omitted <==** **----- Start of picture text -----**<br> Air Velocity (ft./min.)<br>0 100 200 300 400 500 600 700 800 900 1000<br>100 10<br>90 9<br>80 ts, oo 8<br>70 * <a “7 7<br>60 tS **s . + ro Pada ° 777saa“ E2A-T220-25AE E2A-T220-38AE 6<br>50 E2A-T247-38AE 5<br>40 a” e “47ror —— E3A-T220-25AE 4<br>e ai “ey<br>30 ro ~ “4 3<br>Lf OS al i ===:<br>20 4 7 _=— “See 2<br>10 i ~- 1<br>0 0<br>0 1 2 3 4 5 6 7 8 9 10<br>Heat Dissipated (watts)<br>Mounting Surface Temp. Rise C)above Ambient ( ° C/watts) Surface to Ambient ( °<br>Thermal Resistance from Mounting<br>**----- End of picture text -----**<br> (continued) **172** 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com ## **EX Series Heatsinks For TO-220 and TO-247 devices and bridge rectifiers** **==> picture [528 x 13] intentionally omitted <==** **----- Start of picture text -----**<br> d i m E N S i O N S<br>**----- End of picture text -----**<br> **==> picture [502 x 484] intentionally omitted <==** **----- Start of picture text -----**<br> in. (mm)<br>#6-32 tap thru Tin-plated steel pins<br>0.090"<br>0.64" (2.3mm)<br>E2A-T220-38E (16.3mm) 0.40" 0.160" REF.<br>(10.2mm)<br>0.136" ±.010 0.72"<br>( 3.45mm ±.25) 0.64" 1.50" (18.3mm) 0.156"<br>(16.3mm) (38.1mm) (4.0mm )<br>#6-32 thread thru Tin-plated steel pins<br>0.090"<br>(2.3mm)<br>0.64"<br>E2A-T220-25E (16.3mm) 0.40" 0.160" REF.<br>(10.2mm)<br>0.136" ±.010 0.72"<br>( 3.45mm ±.25) 0.64" 1.00" (18.3mm) 0.156"<br>(16.3mm) (25.4mm ) (4.0mm )<br>#6-32 tap thru<br>0.090"<br>(2.3mm)<br>0.64"<br>E2A-T247-38E (16.3mm) 0.40"<br>(10.2mm)<br>0.320"<br>0.850"<br>0.136" ±.010 (21.6mm)<br>( 3.45mm ±.25) 0.64" 1.500" 0.156"<br>(16.3mm) (4.0mm)<br>(38.1mm)<br>ø0.164" hole<br>#8-32 UNC-2B thread, thru<br>1.00"<br>(25.4mm)<br>E3A-T220-25E<br>0.50"<br>(12.7mm)<br>0.50"<br>(12.7mm)<br>1.00" 1.00"<br>(25.4mm) (25.4mm)<br>**----- End of picture text -----**<br> ## ~~**O r d E r i N g i N F O r m at i O N**~~ **Extrusion type RoHS Compliant E 2 A - T 2 2 0 - 3 8 E Series Finish Package Height** EX A = anodized **type** **==> picture [146 x 41] intentionally omitted <==** 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com **173**
Updated at April 29, 2026
With nearly a century of engineering expertise, Ohmite is a premier manufacturer of high-performance resistive and thermal management products. Founded in 1925, the company has continuously evolved alongside the electronics industry, building a reputation for resolving complex design challenges. Ohmite specializes in delivering reliable solutions for high-current, high-voltage, and high-energy applications across the industrial, medical, aerospace, and transportation sectors. The core of our Ohmite offering centers on their advanced cooling and thermal management solutions, particularly natural convection heat sinks. Engineered to efficiently dissipate thermal energy in demanding environments, these heat sinks help designers overcome critical thermal bottlenecks. By effectively managing heat dissipation, Ohmite's thermal products ensure the optimal performance and extended longevity of sensitive electronic assemblies. Complementing their thermal management expertise, our selection includes precision sensing and circuit protection components. Ohmite's robust force sensors and load cells provide dependable measurement capabilities for specialized industrial applications, while their temperature sensing and compensation NTC thermistors offer accurate environmental monitoring. These product lines reflect Ohmite’s enduring commitment to quality, innovation, and specialized component engineering.
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