ALPHA SMV1270-079 Datasheet

Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com 1

Specifications subject to change without notice. 6/99A

Hyperabrupt Junction Tuning Varactor

Features

■ High Capacitance Ratio

■ Ultra Small Size SC-79 Package

■ Designed for High Volume, Low Cost

Battery Applications

■ Available in Tape and Reel Packaging

SMV1270-079

Description

The SMV1270-079 is a silicon hyperabrupt junction varactor
diode specifically designed for battery operation.The
specified high capacitance ratio and low RSof this varactor
make it appropriate for low noise VCOs used at frequencies
in wireless systems to beyond 2.5 GHz.Applications include
low noise and wideband UHF and VHF VCO f or GSM, PCS,
CDMA and analog phones.

Characteristic Value

Forward Current (IF) 20 mA
Power Dissipation (PD) 250 mW
Storage Temperature (TST) -55°C to +150°C
Operating Temperature (TOP) -55°C to +125°C

Absolute Maximum Ratings

Parameter Condition Min. Typ. Max. Unit

Reverse Current (IR)V

R

= 20 V 20.0 nA

Capacitance (CT)C

T

@ 0.5 V, VR= 0.5 V, F = 1 MHz 22.1 23.6 25.1 pF

Capacitance (CT)C

T

@ 2.5 V, VR= 2.5 V, F = 1 MHz 7.7 8.6 9.8 pF

Capacitance Ratio (CTR)C

T

(0.5 V)/CT(2.5 V) 2.3 2.7

Series Resistance (RS)V

R

= 1 V, F = 470 MHz 0.7 Ω

Breakdown V oltage (VBR)I

R

= 10 µA 20.0 V

Electrical Specifications at 25°C

Hyperabrupt Junction Tuning Varactor SMV1270-079

2 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com

Specifications subject to change without notice. 6/99A

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

0

5

10

15

20

25

Varactor Voltage (V)

Capacitance vs. Voltage

Capacitance (pF)

-40 -20 0 20 40 60 80

Temperature (˚C)

Relative Capacitance

Change vs. Temperature

Percent of Variation (%)

-4

-3

-2

-1

0

1

2

3

4

5

V

VAR

= 1 V

V

VAR

= 2.5 V

V

VAR

= 4 V

Typical Performance Data

0.060 (1.50 mm) MIN.

0.067 (1.70 mm) MAX.

0.010

(0.25 mm) MIN.

0.014

(0.35 mm) MAX.

0.043 (1.10 mm) MIN.

0.051 (1.30 mm) MAX.

0.020

(0.50 mm) MIN.

0.028

(0.70 mm) MAX.

0.003

(0.07 mm) MIN.

0.008

(0.20 mm) MAX.

10˚ MAX.

10˚ MAX.

0.028

(0.70 mm) MIN.

0.035

(0.90 mm) MAX.

0.006 (0.15 mm) MIN.

CATHODE

INDICATOR

12

SC-79

DIODE
Varactor_Diode
AREA = 1
MODEL = Diode_Model
MODE = nonlinear

RES
R

S

R = R

S

IND
L

S

L = L

S

CAP
C

P

C = C

P

PORT
P_anode
port = 1

PORT
P_Cathode
port = 2

DIODEM
Diode_Model
I

S

= 1.00e-14

R

S

= 0
N = 1
T

T

= 0

C

JO

= C

JO

M = M
E

G

= 1.11
X

TI

= 3
K

F

=0

A

F

=1

F

C

= 0.5

B

V

= 0

I

BV

= 1e-3
I

SR

= 0
N

R

= 2
I

KF

= 0
N

BV

= 1

I

BVL

= 0

N

BVL

= 1

T

BV1

= 0

T

NOM

= 27

F

FE

= 1

SPICE Model

Capacitance vs. Voltage

VR (V) CT(pF)

0.5 23.64

1.0 17.81

1.5 13.69

2.0 10.74

2.5 8.60

3.0 7.03

3.5 5.87

4.0 5.00

4.5 4.35

5.0 3.85

Part C

JO

V

J

M

C

P

R

S

L

S

Number (pF) (V) (pF) (

ΩΩ))

(nH)

SMV1270-079 30 12 8 2 0.7 1.7