Thin Film Attenuator

YDS’s Thin Film Attenuators are miniature sized, consisting of high precision thin film and has high performance. It is allowed to be more compact and have higher performance, with having an attenuation circuit in an element. We can serve products with more excellent performance and higher density mounting than the elements consisting of combination circuit of several resistors. You can save more area in a circuit and design more easily with only one element. Various kinds of YDS’s Thin Film Attenuators are available in many different ways.

Much less mounting area, weight and fewer items than when using combination of several resistors

Higher reliability with fewer joints on the circuit

Easy automatic mounting because of surface mount type with round wrapped electrode (served by taping)

Performing fine characteristics in a wide range from low to high frequency

High precision and stability due to the high precision thin film

High reliability due to the same basic construction as the general thin film chip resistors’

Little attenuation change, phase change and delay change affected by temperature, with fine relative performance and pattern design of thin film

Steady characteristics not only in the same lot but among lots with thin film manufacturing technique

Various kinds of attenuators available in different powers and many different ways.

We can offer custom-made attenuators for impedance matching.

A: Face down attenuator PAT0510

We developed this attenuator in order to serve the smallest one in the world at a low price. It has the electrode for mounting on the top side and doesn’t have side electrodes. It is face down mounted.

B: Single type attenuator PAT1220, PAT1632, PAT3042S

It has round wrapped electrodes as well as general chip resistors. It is the most useful attenuator with its mounting form like other chips’, standard size and performance.

C: Double type attenuator PAT3042W, PAT34556W

This attenuator is used in particular ways, in order to embed it in the circuit substrate with lead frame joint or to put it inside the connector.

This attenuator is available in a wide range of high frequency circuits such as radio communication circuit. Due to its high stability in a wide band, it is used from low frequency circuits to high, for power derating, impedance matching and preventing oscillation.

Radio communication: cellar phone, base station of cellar phone, radio LAN system, communication system for ITS, communication system between inside the car and outside and automotive sensor

Measuring apparatus for high frequency: network analyzer, spectrum analyzer and high frequency analyzer

Optical communication circuit

This attenuator is superior to a circuit consisting of several resistors.

Less components in a circuit will make it possible to decrease area and weight on the PC board and mounting operations.

The ratios of mounted area and weight in both circuits of with three resistors and with a chip resistor are showed in the following graph.

Chip Attenuator	size	The same performance with single resistors	Saved mounting area	Saved volume
PAT0510	0.5×1.0×0.3mm	0603×3 pieces	about 50%	about 90%
?	?	1005×3 pieces	about 20%	about 33%
PAT1220	1.25×2.0×0.4mm	1005×3 pieces	about100%	about200%
?	.	1608×3 pieces	about 40%	about 65%
?	.	2125×3 pieces	about 26%	about 33%
PAT1632	1.6×3.2×0.4mm	1608×3 pieces	about 73%	about130%
?	.	2125×3 pieces	about 50%	about 70%
?	.	3216×3 pieces	about 17%	about 33%

Having an in-put terminal and an out-put, and a ground in a chip attenuator, it is easier to get fine performance and to adjust to the micro strip line designed by the coefficient of the print board. By assembling with several resistors, there will be more parasitic capacitors and inductors and it is supposed that frequency characteristics will be decreasing. Moreover it is possible to simplify designing circuits with an attenuator. These below pictures show the difference.