PSC

www.vishay.com

Vishay Electro-Films

Revision: 13-Mar-17

Document Number: 61050

For technical questions, contact: efi@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

High Frequency RF Spiral Inductor for Wire Bonded Assemblies

PSC series RF spiral inductors are designed for RF circuits

that require wire bondable components. High precision

equivalent circuit modeling enables accurate computer

simulation of component performance. Additional values

and form factors available upon request.

FEATURES

• Wire bond assembly

• Small size: 45 mils x 45 mils x 10 mils

• Low DCR, high Q

• Low parasitic capacitance, high SRF

APPLICATIONS

• RF choking for DC biasing

• RF tuning circuits

• Lumped element filters

Note

(1)

Main source of value tolerance is due to variation in wire bonds. See “text fixture” section below

Note

(1)

Including the added inductance and resistance of typical bond wires. See equivalent circuit section

STANDARD ELECTRICAL SPECIFIACTIONS

PARAMETER VALUE UNIT

Inductance Range 0.001 to 0.1 μH

Tolerance

(1)

± 20 %

Max. Power Handling 250 mW

Operating Temperature -55 to +125 °C

Storage Temperature -55 to +125 °C

RF CHARACTERISTICS - TYPICAL VALUES

PART NUMBER

INDUCTANCE

(nH)

DCR

()

IN-CIRCUIT

INDUCTANCE

(1)

(nH)

IN-CIRCUIT

DCR

(1)

()

(UNITLESS)

SRF

(GHz)

250 MHz 1000 MHz 250 MHz 1000 MHz

PSC3400C 3.4 3.4 0.26 6 0.36 8 14 10.2

PSC1050B 10.5 10.5 0.9 12 1 10 16 5.5

PSC1250B 12.5 12.5 0.9 15 1 12 18 5.0

PSC1800B 18 18 1.25 20.5 1.35 13 15 4.2

PSC4500B 45 50 3.4 47.5 3.5 13 8 2.4

DIMENSIONS in inches (millimeters)

LENGTH WIDTH THICKNESS BOND PAD DIAMETER

0.045 ± 0.002 (1.143 ± 0.051) 0.045 ± 0.002 (1.143 ± 0.051) 0.010 ± 0.001 (0.254 ± 0.0254) 0.006 (0.152)

0.045

0.006

PSC

www.vishay.com

Vishay Electro-Films

Revision: 13-Mar-17

Document Number: 61050

For technical questions, contact: efi@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

Note

(1)

Bond pad geometry can be modified upon request

EQUIVALENT CIRCUIT

The inductor’s spiral trace presents a substantial amount of series resistance, and the close spacing of the spiral turns presents

measurable amounts of stray capacitance that interact with the inductive characteristics.

A useful tool commonly used to model the behavior of electronic components at high frequency is the equivalent circuit model.

While the equivalent circuit model accurately predicts the reactive part of the total impedance, it fails to determine the real part

of the response at high frequency. This is due to the fact that the model does not include skin and proximity effects that

significantly increase the real part of the impedance as the frequency rises.

Fig. 1 - Equivalent Circuit



The equivalent circuit values are presented in the table

below:

Note

(1)

Typical bond wires are approximated as being 1.25 mil in

diameter gold, totaling a length of 3 mm. The resistance listed

above includes the added effect of the bond wire adhesion to the

substrate and component

MECHANICAL SPECIFICATIONS

Chip Substrate Material Alumina 99.6 %

Conductor Material Gold

Conductor Thickness 5 μm ± 10 %

Bond Pad Diameter

(1)

6 mil

GLOBAL PART NUMBER INFORMATION

Global Part Number: PSC3400CL4A1GNHW1

Global Part Number Description: PSC 3.4 nH 25 % 45 x 45 x 10 Au None H W1

MODEL

INDUCTANCE

(nH)

INDUCTANCE

MULTIPLIER

CODE

TOLERANCE

CODE

SIZE SUBSTRATE

THICKNESS

(mil)

TERMINATION

BACK

METAL

TEST

CLASS

PACKAGING

CODE

PSC

The first

4 digits are

significant

figures of

inductance

= 0.001

= 0.01

= 0.1

= 20 %

= 25 %

= 45 x 45

= alumina

= 10

= au

= none

= class H

= class K

waffle pack,

1 min.,

1 mult.

= tape

and reel

100 min.,

1 mult.

Bond Wire Spiral Inductor

L: Desired inductance

R: Parasitic self resistance

C: Parasitic shunt capacitance

: Bond wire self resistance

EQUIVALENT CIRCUIT MODEL 2

INDUCTANCE VALUE

(nH)

DCR

()

SHUNT

CAP. C

(fF)

TYP.

(1)

()

TYP.

(1)

(nH)

3.4 0.26 71 0.1 2.5

10.5 0.9 80 0.1 2.5

12.5 0.9 81 0.1 2.5

18 1.25 84 0.1 2.5

45 3.4 92 0.1 2.5

4000 L4ACCPS 1GN HW1