DO-204

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General form of the packages described by DO-204. Lead diameter is not controlled less than E from the body to allow for minor irregularities. DO-204 Dimensions.svg
General form of the packages described by DO-204. Lead diameter is not controlled less than E from the body to allow for minor irregularities.
1N4148 diodes, in the DO-35 package Diode 1n4148.jpg
1N4148 diodes, in the DO-35 package
A drawing of a DO-41 diode package. The cathode is marked with a silver or white band. DO-41 (shaded).svg
A drawing of a DO-41 diode package. The cathode is marked with a silver or white band.

DO-204 is a family of diode semiconductor packages defined by JEDEC. This family comprises lead-mounted axial devices with round leads. Generally a diode will have a line painted near the cathode end.

Diode electronic component

A diode is a two-terminal electronic component that conducts current primarily in one direction ; it has low resistance in one direction, and high resistance in the other. A diode vacuum tube or thermionic diode is a vacuum tube with two electrodes, a heated cathode and a plate, in which electrons can flow in only one direction, from cathode to plate. A semiconductor diode, the most common type today, is a crystalline piece of semiconductor material with a p–n junction connected to two electrical terminals. Semiconductor diodes were the first semiconductor electronic devices. The discovery of asymmetric electrical conduction across the contact between a crystalline mineral and a metal was made by German physicist Ferdinand Braun in 1874. Today, most diodes are made of silicon, but other materials such as gallium arsenide and germanium are used.

JEDEC standards organization

The JEDEC Solid State Technology Association is an independent semiconductor engineering trade organization and standardization body.

A cathode is the electrode from which a conventional current leaves a polarized electrical device. This definition can be recalled by using the mnemonic CCD for Cathode Current Departs. A conventional current describes the direction in which positive charges move. Electrons have a negative electrical charge, so the movement of electrons is opposite to that of the conventional current flow. Consequently, the mnemonic cathode current departs also means that electrons flow into the device's cathode from the external circuit.

Contents

Dimensions

Variants included in DO-204 [1]
VariantOther
standards [2]
Dimensions (mm)
ABCDE
minmaxminmaxminmaxminmaxminmax
AA DO-7 [3] 25.40 38.10 5.85 7.65 0.46 0.55 2.16 2.71 1.27
AB DO-14 [4] 25.40 38.10 5.85 7.62 0.46 0.55 2.75 3.55 1.27
AC DO-15 [5] 25.40 38.10 5.85 7.62 0.69 0.88 2.65 3.55 1.27
AD DO-16 [6] 11.43 19.05 1.27 2.54 0.23 0.33 1.27 1.27
AE DO-26 [7] 35.56 38.10 8.75 10.41 0.69 0.99 5.59 6.60 2.03
AF DO-29 [8] 25.40 38.10 8.00 9.14 0.74 0.83 3.05 3.81 1.27
AG DO-34 [9] 25.40 38.10 2.16 3.04 0.46 0.55 1.27 1.90 1.27
AH DO-35 [10] 25.40 38.10 3.05 5.08 0.46 0.55 1.53 2.28 1.27
AJ 11.43 13.97 5.85 7.62 0.49 0.53 2.16 2.66 1.27
AK 11.43 13.97 3.81 4.45 0.36 0.40 1.66 1.90 1.27
AL DO-41 [11] 25.40 4.07 5.20 0.72 0.86 2.04 2.71 1.27
AM 17.53 38.10 3.18 5.20 0.64 0.91 1.27 2.79 1.27
AN 25.40 5.08 5.84 0.71 0.86 2.54 3.05 1.27
AP 25.40 38.10 3.18 4.57 0.74 0.89 2.54 3.81 1.27
AR 27.95 38.10 9.27 9.52 1.22 1.32 6.10 6.35 2.54

Common variants

Several common packages are archived in DO-204 as variants, and may be referred to using their alternative names.

DO-7

The DO-7 (also known as DO-204-AA) is a common semiconductor package for 1N34A germanium diodes. [3] [12]

A semiconductor package is a metal, plastic, glass, or ceramic casing containing one or more discrete semiconductor devices or integrated circuits. Individual components are fabricated on semiconductor wafers before being diced into die, tested, and packaged. The package provides a means for connecting the package to the external environment, such as printed circuit board, via leads such as lands, balls, or pins; and protection against threats such as mechanical impact, chemical contamination, and light exposure. Additionally, it helps dissipate heat produced by the device, with or without the aid of a heat spreader. There are thousands of package types in use. Some are defined by international, national, or industry standards, while others are particular to an individual manufacturer.

Germanium Chemical element with atomic number 32

Germanium is a chemical element with symbol Ge and atomic number 32. It is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbours silicon and tin. Pure germanium is a semiconductor with an appearance similar to elemental silicon. Like silicon, germanium naturally reacts and forms complexes with oxygen in nature.

DO-35

The DO-35 (also known as DO-204-AH or SOD27) is a semiconductor package used to encapsulate signal diodes. [10] [13] [2] It is often used to package small signal, low power diodes such as 1N4148 (a 100V, 300mA silicon diode.)

1N4148 signal diode standard silicon switching diode

The 1N4148 is a standard silicon switching signal diode. It is one of the most popular and long-lived switching diodes because of its dependable specifications and low cost. Its name follows the JEDEC nomenclature. The 1N4148 is useful in switching applications up to about 100 MHz with a reverse-recovery time of no more than 4 ns.

DO-41

The DO-41 (also known as DO-204-AL or SOD66) is a common semiconductor package used to encapsulate rectifier diodes. [11] [14] The name is derived from the JEDEC descriptor "Diode Outline, Case Style 41". [2] DO-41 diodes are larger than signal diode packages such as DO-35, which are not required to handle large currents. The most common diode using this packaging is the 1N400x series of rectification diodes.

Rectifier AC-DC conversion device; electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.

1N400x general-purpose diodes

The 1N400x series is a family of popular 1 A general-purpose silicon rectifier diodes commonly used in AC adapters for common household appliances. Its blocking voltage varies from 50 volts (1N4001) to 1000 volts (1N4007). This JEDEC device number series is available in the DO-41 axial package, and similar diodes are available in SMA and MELF surface mount packages.

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TO-220

The TO-220 is a style of electronic package used for high-powered, through-hole components. The "TO" designation stands for "transistor outline". TO-220 packages have three leads. Similar packages with two, four, five or seven leads are also manufactured. A notable characteristic is a metal tab with a hole, used in mounting the case to a heatsink, allowing the component to dissipate more heat than one constructed in a TO-92 case. Common TO-220-packaged components include discrete semiconductors such as transistors and silicon-controlled rectifiers, as well as integrated circuits.

TO-3

In electronics, TO-3 is a designation for a standardized metal semiconductor package used for power semiconductors, including transistors, silicon controlled rectifiers, and, integrated circuits. TO stands for "Transistor Outline" and relates to a series of technical drawings produced by JEDEC.

2N2222

The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. It was originally made in the TO-18 metal can as shown in the picture.

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In electronics, TO-18 is a designation for a style of transistor metal case. The case is more expensive than the similarly sized plastic TO-92 package. The name is from JEDEC, signifying Transistor Outline Package, Case Style 18.

TO-5 designation for a standardized metal semiconductor package

In electronics, TO-5 is a designation for a standardized metal semiconductor package used for transistors and some integrated circuits. The TO element stands for "transistor outline" and refers to a series of technical drawings produced by JEDEC.

TO-126

TO-126 is a type of semiconductor package for devices with three pins, such as transistors. The package is rectangular with a hole in the middle to allow for easy mounting to a board or a heat sink.

Small Outline Diode semiconductor packages for diodes

Small Outline Diode (SOD) is a designation for a group of semiconductor packages for surface mounted diodes. The standard includes multiple variants such as SOD-123, SOD-323, SOD-523 and SOD-923. SOD-123 is the largest, SOD-923 is the smallest.

DO-214

DO-214 is a standard that specifies a group of semiconductor packages for surface mounted diodes.

References

  1. "JEDEC DO-204 family package specification" (PDF). JEDEC . January 20, 1976. Archived from the original (PDF) on October 10, 2008.
  2. 1 2 3 "Master Index for JEDEC 95 Outlines and Standards" (PDF). JEDEC . Archived from the original (PDF) on June 16, 2017. Retrieved June 16, 2017.
  3. 1 2 "JEDEC DO-7 package specification" (PDF). JEDEC . Archived from the original (PDF) on June 17, 2017.
  4. "JEDEC DO-14 package specification" (PDF). JEDEC . Archived from the original (PDF) on June 17, 2017.
  5. "JEDEC DO-15 package specification" (PDF). JEDEC . Archived from the original (PDF) on June 17, 2017.
  6. "JEDEC DO-16 package specification" (PDF). JEDEC . Archived from the original (PDF) on June 17, 2017.
  7. "JEDEC DO-26 package specification" (PDF). JEDEC . Archived from the original (PDF) on June 17, 2017.
  8. "JEDEC DO-29 package specification" (PDF). JEDEC . Archived from the original (PDF) on June 17, 2017.
  9. "JEDEC DO-34 package specification" (PDF). JEDEC . Archived from the original (PDF) on June 17, 2017.
  10. 1 2 "JEDEC DO-35 package specification" (PDF). JEDEC . Archived from the original (PDF) on June 17, 2017.
  11. 1 2 "JEDEC DO-41 package specification" (PDF). JEDEC . Archived from the original (PDF) on June 17, 2017.
  12. DO-7 diode package; Interface Bus.
  13. DO-35 diode package; Interface Bus.
  14. DO-41 diode package; Interface Bus.