The SMD Codebook Download

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 SAC . (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

a anode

b base

c cathode

ca common anode

cc common cathode

comp complement

d drain

dg dual gate

dtr digital transistor (see codebook introduction)

enh enhancement (mode - FETs)

fet field effect transistor

fT transition frequency

GaAsfet Gallium Arsenide field effect transistor

g gate

gnd ground

gp general purpose

hfe small signal current gain

i/p input

Id drain current

Ig gate current

Ir 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 pin diode

pkg package

pnp pnp bipolar transistor

prot protection, protected (as in mosfet gate)

res resistor

s source

ser series

Si silicon

substr substrate

sw switch or switching

Vce collector - emitter voltage (maximum)

Vcc collector supply voltage

Manufacturer abbreviations

Agi Agilent (was HP)

Fch Fairchild

HP Hewlett-Packard (Now Agilent)

Inf Infineon (was Siemens)

ITT ITT Semiconductors

MC Mini-Circuits

Mot Motorola (now ON Semiconductors)

Nat National Semiconductor

Nec NEC

NJRC New Japan Radio Co

ON 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

Download The SMD Codebook.pdf