2024年5月20日发(作者：濯青亦)

THE SMD

CODEBOOK

SMD Codes.

SMD devices are, by their very nature, too small to carry conventional semiconductor type numbers.

Instead, a somewhat arbitrary coding system has grown up, where

the device package carries a simple two- or three-character ID code.

Identifying the manufacturers' type number of an SMD device from

the package code can be a difficult task, involving combing through

many different databooks.

This HTML book is designed to provide an easy means of device

identification. It lists well over 3,400 device codes in alphabetical

order, together with type numbers, device characteristics or

equivalents and pinout information.

How to use the SMD Codebook

To identify a particular SMD device, first identify the package style and note the ID code printed on the device.

Now look up the code in the alphanumeric listing which forms the main part of this book by clicking on the first

character shown in the left-menu.

Unfortunately, each device code is not necessarily unique. For example a device coded 1A 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.

ID Code Variations

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 is 1A, 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

This has been a problem in the past, however recently manufacturers have been adding lower case letters

which clarify the code.

Many recent Motorola devices have a small superscript letter after the device code, such as SA

C

. (This smaller

letter is merely a month of manufacture code.)

Many devices from Rohm Semiconductors which start with G have direct equivalents found in the rest of the

number. For example GD1 is the same as D1 which 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.

SOT323.

SC70.

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.

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:

2024年5月20日发(作者：濯青亦)

THE SMD

CODEBOOK

SMD Codes.

SMD devices are, by their very nature, too small to carry conventional semiconductor type numbers.

Instead, a somewhat arbitrary coding system has grown up, where

the device package carries a simple two- or three-character ID code.

Identifying the manufacturers' type number of an SMD device from

the package code can be a difficult task, involving combing through

many different databooks.

This HTML book is designed to provide an easy means of device

identification. It lists well over 3,400 device codes in alphabetical

order, together with type numbers, device characteristics or

equivalents and pinout information.

How to use the SMD Codebook

To identify a particular SMD device, first identify the package style and note the ID code printed on the device.

Now look up the code in the alphanumeric listing which forms the main part of this book by clicking on the first

character shown in the left-menu.

Unfortunately, each device code is not necessarily unique. For example a device coded 1A 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.

ID Code Variations

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 is 1A, 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

This has been a problem in the past, however recently manufacturers have been adding lower case letters

which clarify the code.

Many recent Motorola devices have a small superscript letter after the device code, such as SA

C

. (This smaller

letter is merely a month of manufacture code.)

Many devices from Rohm Semiconductors which start with G have direct equivalents found in the rest of the

number. For example GD1 is the same as D1 which 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.

SOT323.

SC70.

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.

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: