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To identify a particular SMD device, first identify the package style and note the ID code printed on the device.
Now enter the code in the search forms and click search to get the results
Unfortunately, each device code is not necessarily unique.
For example a device coded1A might be either a BC846A or a FMMT3904
Even the same manufacturer may use the same code for different devices!
If there is more than one entry, use the package style to differentiate between devices with the same ID code.
This compilation has been collected from R P Blackwell G4PMK, manufacturers' data and other sources of SMD device ID codes, pinout and leaded device equivalent information.
The entries under the Manufacturer column are not intended to be comprehensive; rather they are intended to provide help on locating sources of more detailed information if you require it.
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Many manufacturers use an extra letter as their own identification code.
If the device is from Philips it will sometimes have a lower case 'p' (or sometimes 't') added to the code;
Siemens devices usually have a lower case 's'.
For example, if the code is1A, according to the table there are a number of possibilities
- 1A BC846A Phi ITT N BC546A
- 1A FMMT3904 Zet N 2N3904
- 1A MMBT3904 Mot N 2N3904
- 1A IRLML2402 IR F n-ch mosfet 20V 0.9A
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Many recent Motorola devices have a small superscript letter after the device code, such asSAC.(This smaller letter is merely a month of manufacture code.)
Many devices from Rohm Semiconductors which start withGhave direct equivalents found in the rest of the number.
For exampleGD1is the same asD1which is a BCW31.
Some devices have a single coloured letter (usually on extremely small diode packages). Colour, if significant, is shown in small type after the code letter
An 'L' suffix usually indicates a low-profile package, such as an SOT323 or SC70
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Reverse joggle devices do present a few problems. They oftern have an 'R' in the type number.
A reverse package is one where the lead have been bent up instead of down. So it's a mirror image of a conventional device.
Identification is usually possible from the code number, but some manufacturers use the same code. In these cases, it's a case of looking at the device with a magnifying glass.
The leads of most normal packages come out closer to the circuit board side of the device; conversely a reverse joggle package will have them coming out closer to the 'top' of the device
Sometimes a series of devices, derived from the same die, have related type (not code) numbers.
Often an 'R' will indicate a reverse joggle package, and/or a 'W' indicate a smaller package variant, such as SOT343.
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Sometimes similarities are also found in the code numbers. For example:
Recently some manufacturers have used a symbol or lower case letter to indicate the country of manufacture. These have been ignored in the alphabetical ordering. For example:
- 67' is the code for a BFP67 (SOT143 package) ,
- 67R' is the code for the reverse joggle variant BFP67R (SOT143R),
- W67' is the code for a SOT343 package version.
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Where possible, the listing gives the part number of a conventional wire-leaded device with equivalent characteristics. If the leaded device is well-known then no more information is given. If the device is less common, some additional information will sometimes be given. Where no exact leaded equivalent exists, a brief device description is given, which may be sufficient to allow substitution with another device.
When describing device characteristics, some terms are implied from the type of device.
For example, a voltage specified for a rectifier diode is usually the maximum PIV (peak inverse voltage) of the diode, but for a zener diode the operating [zener voltage] will be given.
Normally, where a voltage, current or power is specified, these will be limiting values.
For example, a device specified as NPN 20V 0.1A 1W is a NPN transistor with a Vce [max] of 20V, maximum collector current of 100mA and a maximum total power dissipation of 1W.
Some of the transistors are types with integrated resistors; in the list, a base resistor means a resistor connected in series with the base. When two resistor values are given, the first is the series base resistor, and the second the resistor between base and emitter.
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Identifying the manufacturers' type number of an SMD device from the package code can be a difficult task, involving combing through many different data books.
This SEARCH is designed to provide an easy means of device identification.*
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