Pin 1 dot (common)Epoxy coating · A103J: 8 × 10 kΩ9 pins (1 = common end) · 2.54 mm spacing

Flat black or yellow body, dot at one end, value code on top, 9 legs in a single row
Pin pitch 2.54 mm; the 9-pin type is ≈ 23 mm long · Example shown: A103J, 8 × 10 kΩ common-pin SIP-9

Resistors

Resistor network (SIP)

In simple terms

What is this?

A small strip that gathers a row of resistors of the same value into one body.

What is it for?

Connects the same resistor value to many input lines or LEDs in one go; less wire clutter.

Where do you see it?

On old computer and device boards, a small black strip with a single row of pins.

How do you spot it?

A thin black strip with a single row of legs; a dot or line at one end marks the common leg.

Caution:

Don’t insert the common leg in reverse; set the direction by the dot or the line.

Technical definition

A single-in-line (SIP) package with several resistors of the same value in one body. In the common-pin type, one end of each resistor is joined, which makes it ideal for pull-ups. The common pin is marked with a dot or line on the body.

Pin9 (8 resistors + common)

Tolerance±2%

Power≈0.2 W / resistor

Schematic symbol IEC and ANSI differ

IEC 60617: the drawing style used in Türkiye and Europe.

Pins 2

1Common pinPin 1 at the dotted end; the end where all the resistors joinCOM

2Pins 2–9Each one is the other end of a resistor2–9

Features typical

Number of resistors: 8 (9-pin common type)
Tolerance: ±2%
Power: ≈0.2 W / resistor
Pin pitch: 2.54 mm
Value code: 103 = 10 kΩ
Types: Common pin · separate (isolated)
Example part: 4609X-101-103 (8 × 10 kΩ, common pin)

Common mistakes

Plugging the common pin in backwardsIf you plug it in without seeing the dot, the common end goes to the wrong line and the circuit connects unexpectedly. The dot is pin 1.

Confusing it with an isolated typeIn the isolated type each resistor has two separate legs and there is no common pin. Compare the body code with the datasheet.

Test with a multimeter

Test whether this part is good with the multimeter on the measurement screen.

Take a measurement

Where it is used

Pull-ups on input linesCurrent-limiting resistors for an LED rowSetting input with a DIP switch