DO-41 Axial Lead
DO-41 Diode Package Dimensions
Diode Package Style DO-41 Case out-line, Through-Hole
DO-41 Diode, Axial Lead Component Package
The DO-41 package is a 2-terminal Axial Leaded Through-Hole device.
A DO-41 is an out-dated package designation, replaced by DO-204-AL with newer devices. However any current device still in production or inventory will still use the DO-41 designation. The physical dimensions of the component are unchanged between the different designations. The only difference being how JEDEC classifies the package, which is a variant of the DO-204 family [DO-204AL].
The leads should be bent near the component body to keep the leads as short as possible, and also insure the body is raised up just above the surface of the PWB. However the leads should not be bent right at the body, which could cause damage to the body to terminal connection point. The short leads between the DO-41 and the Printed Circuit Board [PCB] allow more efficient heat conduction into the board [Horizontal mounting]. Vertical mounting is also possible and results in even more efficient heat conduction than horizontal mounting because of the single short lead. The shorter the leads the lower the thermal resistance between the DO-41 body and the PCB. The lower the thermal resistance the better the heat conduction between the component and the board. Read more on Diode mounting options and heat dissipation, and lead length requirements.
Copper heat sinks are available for axial leaded components. When the DO-41 is mounted horizontally to the board a heat sink can be clipped onto the body of the DO-41 to aid in heat dissipation. Note that most data sheets indicate a minimum body length of 4.06mm [listed as max in the graphic] and a maximum body length of 5.21mm. The diameter also differs from the diagram above; the maximum component diameter shown is 2.16mm, but usually given in the 2.00 to 2.72mm in the data sheet.
Semiconductor DO-41 Diode Packages;
Fast Recovery Power Rectifier; 1N4933, 1N5186, 1N5187, 1N5188, and 1N5190
Ultra-Fast-Recovery Power Rectifier Diode; 1N6620 to 1N6625, 1N6626 to 1N6631
GP Rectifier Diode; 1N4001, 1N4002, 1N4003, 1N4004, 1N4005, 1N4006, 1N4007
Schottky Barrier Hermetic Diode; 1N5819-1, 1N6761-1
Voltage Regulator Diode; 1N4460 through 1N4496, and 1N6485 through 1N6491
DO-41 Diode Package Derating
DO-41 Diode Package Temperature-Power Derating Curve
DO-41 Diode Current Derating Curve
How to derate a Axial Lead Through-Hole DO-41 package based on operating temperature. Note that the chart provides for lead length. Use one of the lower gray curves for best operation. Derate Temperature by Device; Diode Derating Curves
How to read the temperature curves; Interpreting Deraring Curves.
Note that the maximum operational temperature is 1750C for a DO41 package. However that would be with zero power dissipation and applies to the maximum junction temperature of the semiconductor. As with any leaded component, lead length has a lot to do with power dissipation so use the shortest lead length possible. The chart uses a lead length of 3/8 inch [per lead], "LL" in the picture below.