us_smd-codebook.pdf

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:

' 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.

SOT143.

'Z-S' and 'ZtS ' are both 2PC4081Q devices made by Philips; the first made in Hong Kong

and the second in Malaysia; this appears in the codebook classified under ZS .

Leaded equivalent device and information

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.

Digital Transistors (dtr)

These are transistors with built-in resistors.

Some have one resistor between base and emitter, others in series with the base. Many others have both.

To keep things simple, the series resistor is called R1 and the base emitter resistor is called R2. If both are

present, then two values are given, R1 first. So 4k7 + 10k means that R1 (the base resistor) is 4k7 and R2 (the

resistor between base and emitter) is 10k.

Conclusion

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.

•

Abbreviations

amp

amplifier

atten

attenuator

anode

base

cathode

common anode

common cathode

comp

complement

drain

dual gate

dtr

digital transistor (see codebook introduction)

enh

enhancement (mode - FETs)

fet

field effect transistor

transition frequency

GaAsfet

Gallium Arsenide field effect transistor

gate

gnd

ground

general purpose

hfe

small signal current gain

i/p

input

drain current

gate current

reverse leakage current (diodes)

jfet

junction field effect transistor

MAG

maximum available gain

max

maximum

min

minimum

mmic

microwave minature integrated circuit

modamp

modular amplifier - an mmic amplifier

mosfet

metal oxide insulated gate fet

n-ch

n-channel fet (any type)

npn

npn bipolar transistor

o/p

output

p-ch

p-channel fet (any type)

pin diode

pkg

package

pnp

pnp bipolar transistor

prot

protection, protected (as in mosfet gate)

res

resistor

source

ser

series

silicon

substr

substrate

switch or switching

Vce

collector - emitter voltage (maximum)

Vcc

collector supply voltage

Manufacturer abbreviations

Agi

Agilent (was HP)

Fch

Fairchild

Hewlett-Packard (Now Agilent)

Inf

Infineon (was Siemens)

ITT

ITT Semiconductors

Mini-Circuits

Mot

Motorola (now ON Semiconductors)

Nat

National Semiconductor

Nec

NEC

NJRC

New Japan Radio Co

ON Semiconductors (was Motorola)

Phi

Philips

Roh

Rohm

SGS

SGS-Thompson

Sie

Siemens (now Infineon)

Sil

Siliconix (Vishay-Silliconix)

Tem

Temic Semiconductors

Tfk

Telefunken (Vishay-Telefunken)

Tok

Toko Inc.

Zet

Zetex

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