DA-T263-101E-TR

Heat Sink, Square, D2 Pack, Black Anodized, TO-263, 12.7 mm, 10.16 mm, 25.91 mm

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Manufacturer: OHMITE
Product type: Natural Convection Heat Sinks
Thermal Resistance:-; Packages Cooled:TO-263; External Width - Metric:12.7mm; External Height - Metric:10.16mm; External Length - Metric:25.91mm; External Diameter - Metric:-; Heat Sink Mat
SVHC: No SVHC (27-Jun-2024)
Product Range: D
Packages Cooled: TO-263
Heat Sink Material: Aluminium
Thermal Resistance: -
External Width - Metric: 12.7mm
External Height - Metric: 10.16mm
External Length - Metric: 25.91mm
External Width - Imperial: 0.5"
External Diameter - Metric: -
External Height - Imperial: 0.4"
External Length - Imperial: 1.02"
External Diameter - Imperial: -

Delivery and price
Units per pack	100
Price	1.33 €
Current stock	10+
Lead time	30 days

Datasheet

## **D Series Heatsink For TO-252, TO-263 and TO-268  devices** 

Ohmite D Series heatsinks provide an innovative solution for SMT compatible semiconductors and resistors. The unique design (Patent Pending) combines tin plated, solderable rods with an aluminum extruded heat sink body. These rods (or “rollers”) are mated mechanically to the heatsink by forging to reduce the thermal resistance between the heatsink body and the solderable feet. 

Specifically designed for use with the increasingly popular TO-252, TO-263 and TO-268 packages, the D Series affords the user superior thermal performance over the more common stamped aluminum heatsinks. By eliminating the staking joint typically used in stamped heatsinks, the resulting air gap and thermal “bottle-neck” is also eliminated, while surface area for cooling is maximized with the extruded fins of the D Series body. 

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## **F e a t u r e S** 

- Increased surface areas by 3 times therefore  thermal performance up to 300% over the aluminum stamped heat sinks on markets 

- Light weight aluminum construction allows faster pick and place assembly reducing the manufacturing cycle time 

- Radius mounted “Rollers” are designed for maximizing heat transfer from the component and avoiding the thermal “bottle-neck” seen in stamped and staked heatsinks. 

- Available in bulk packaging or tape & reel (250 units per reel 

- RoHS Compliant 

## ~~**H e at  D i S S i pat i o n**~~ 

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Air Velocity (ft./min.) Air Velocity (ft./min.) Final thermal performance<br>60 200 400 600 800 1000 50 200 400 600 800 100012 is highly dependent on the<br>thermal characteristics of<br>5055 ls* **** + TOTO-263 (D2)-252 (D) ae .o ° Pad ° o ies 1412 45 ** .**,* TO-268 (D3) + * eyeo . ° * °o 10 the PCB. It is possible to see natural convection with a a 50% drop in temp rise in<br>45 A.SK 101 & 201 were ¢wey 10 40 **no 101 & 201 oe°rdy 8 thermally improved PCB.<br>40 ‘| *ot wee”<br>35 6<br>os, 8 “ee<br>35<br>301 6 30 301 4<br>30<br>25 4 25 2<br>2 4 6 8 10 2 4 6 8 10<br>Heat Dissipated (watts) Heat Dissipated (watts)<br>D i m e n S i o n S<br>±0.012” / ±0.30mm<br>Style 10 TO-252 (D) Style 20 Style 30<br>TO-263 (D2) 1.02" TO-268 (D3) 1.22" 1.02" TO-268 (D3) 40.2mm 1.58" TO-263 (D2) 35.2mm 1.39"<br>25.91mm 30.9mm 25.9mm<br>—_ — — i _<br>0.50" 0.50" 0.50"<br>12.7mm 12.7mm 12.7mm<br>0.40" 4 0.48"REF 0.46" '<br>10.16mm 0.27" 12.1mm 0.26" 11.6mm 0.26"<br>6.86mm 6.6mm 6.6mm<br>0.09"<br>2.3mm 0.15"<br>a 0.10" 0.44"  (11.2mm) ‘a | te) 0.44" 3.7mm TO-268 (D3) TO-263 (D2)<br>2.54mm | le 0.56"  (14.2mm) >| | TO-263 (D2)TO-252 (D) | 11.1mm 16.2mm ±0.2 0.64" 11.2mm 0.44"<br>0.56"<br>0.64"  (16.2mm) TO-268 (D3) 14.1mm 0.76" 0.56"<br>|—- 0.76"  (19.2mm) —"| | ±0.2mm (continued) 19.2mm ±0.2 14.2mm<br>C/watts)<br>C/watts)<br>C)<br>C)<br>Ambient (<br>Ambient (<br>Case Temp. Rise above<br>Case Temp. Rise above Surface to Ambient (<br>Surface to Ambient ( Thermal Resistance from Mounting<br>Thermal Resistance from Mounting<br>**----- End of picture text -----**<br>


**170** 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 

## **D Series Heatsink For TO-252, TO-263 and TO-268  devices** 

## ~~le~~ ~~**L a n D  pat t e r n S**~~ 

Land Patterns for D, D2 and D3 

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TO-252 (D) < 0.62"  (15.8mm) ><br>TO-263 (D2)<br>0.35"  (8.89mm) TO-252 (D)<br>0.64"  (16.3mm)<br>0.44"  (11.2mm) TO-263 (D2)<br>0.56"<br>(14.2mm) 0.54"<br>(13.7mm)<br>> | lx _, ><<br>0.06" 0.076"<br>TO-252 (D)<br>(1.40mm) (1.94mm)<br>0.03"<br>(0.80mm) [TO-263 (D2)]<br>**----- End of picture text -----**<br>


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TO-268 (D3)<br>I < 0.83"  (21.1mm) >| < 0.81"  (20.6mm) ><br>0.63"  (16.0mm)<br>0.56"<br>(14.2mm) 0.54"<br>(13.7mm)<br>rig 0.06" 0.03"<br>(1.40mm) (0.80mm)<br>**----- End of picture text -----**<br>


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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Reel diameter: 13.00” (330.00mm)|Reel diameter: 13.00” (330.00mm)||Reel diameter: 13.00” (330.00mm)||||||||||||
|200 pcs. per|200 pcs. per|||||||||||**Style**<br>10, 20 or 30<br>**RoHS**<br>**Compliant**|||
||‘|<br>ee<br>|Suu||K0<br>P1<br>P0<br>S0<br>ø D0<br>~~ed~~ ad<br>Suan <br>Suu|||||||W<br> |||**Standardpart numbers For D Series**<br>**Part Number**<br>**Description**<br>**Packaging**<br>**D A - T 2 6 3 - 2 0 1 E - T R**<br>**Series**<br>D<br>**Length**<br>1 = 0.50"<br>2, 3, 4 = optional lengths<br>assigned<br>sequentially on<br>customer request<br>**Finish**<br>A = black anodized<br>V = degreased<br>**Package**<br>T263 = TO-263<br>(or TO-252)<br>T268 = TO-268<br>**Tape & Reel**<br>~~1~~<br>I<br>~~_~~<br>~~a~~||**Weight**|
|D0|**Style 10**<br>1.55mm||**Style 20**<br>1.55mm<br>1.5mm|**le 20**||||**Style 30**<br>1.5mm||||DV-T263-101E<br>for D2 pack, degreased<br>Bulk<br>DA-T263-101E<br>for D2 pack, black anodized<br>Bulk<br>DV-T263-101E-TR<br>for D2 pack, degreased<br>Reel||3.8 g<br>3.8 g<br>3.8 g|
|K0|10.5mm||10.5mm<br>12.20mm|||||11.50mm||||DA-T263-101E-TR<br>for D2pack, black anodized<br>Reel||3.8g|
|P0|4mm||4.0mm|||||4.0mm||||DV-T268-101E<br>for D3 pack, degreased<br>Bulk||4.1 g|
|P1|24mm|24mm|24mm|||||24.0mm||||DA-T268-101E<br>for D3 pack, black anodized<br>Bulk<br>DV-T268-101E-TR<br>for D3 pack, degreased<br>Reel||4.1 g<br>4.1 g|
|S0|40.4mm||40.4mm<br>40.4mm|||||52.4mm||||DA-T268-101E-TR<br>for D3pack, black anodized<br>Reel||4.1g|
|W|44mm|44mm|44mm|||||56mm||||DV-T263-201E<br>for D or D2 pack, degreased<br>Bulk<br>DA-T263-201E<br>for D or D2 pack, black anodized<br>Bulk|||



**Style RoHS** 10, 20 or 30 **Compliant** P0 ad **D A - T 2 6 3 - 2 0 1 E - T R Series Finish Package** ~~1~~ **Length** I **Tape & Reel** D A = black anodized T263 = TO-263 1 = 0.50" V = degreased (or TO-252) 2, 3, 4 = optional lengths S0 W T268 = TO-268 assigned sequentially on customer request **Standard part numbers For D Series** | ~~_ a~~ ø D0 **Part Number Description Packaging Weight Style 30** DV-T263-101E for D2 pack, degreased Bulk 3.8 g DA-T263-101E for D2 pack, black anodized Bulk 3.8 g 1.5mm DV-T263-101E-TR for D2 pack, degreased Reel 3.8 g 11.50mm DA-T263-101E-TR for D2 pack, black anodized Reel 3.8 g 4.0mm DV-T268-101E for D3 pack, degreased Bulk 4.1 g DA-T268-101E for D3 pack, black anodized Bulk 4.1 g 24.0mm DV-T268-101E-TR for D3 pack, degreased Reel 4.1 g 52.4mm DA-T268-101E-TR for D3 pack, black anodized Reel 4.1 g 56mm DV-T263-201E for D or D2 pack, degreased Bulk DA-T263-201E for D or D2 pack, black anodized Bulk DV-T263-201E-TR for D or D2 pack, degreased Reel Removable Kapton DA-T263-201E-TR for D or D2 pack, black anodized Reel tape on each part DV-T268-301E for D3 pack, degreased Bulk facilitates handling DA-T268-301E  DV-T268-301E-TR for D3 pack, black anodized for D3 pack, degreased Bulk   Reel by automatic pick DA-T268-301E-TR for D3 pack, black anodized Reel and place equipment. DV-T263-301E for D2 pack, degreased Bulk **Style 10 tape and** DA-T263-301E for D2 pack, black anodized Bulk **reel only.** DV-T263-301E-TR for D2 pack, degreased Reel DA-T263-301E-TR for D2 pack, black anodized Reel ~~re~~ 

1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 

**171**

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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