1997 Nov 13

2

Philips Semiconductors

Product specification

VHF variable capacitance diode

BB178

FEATURES

• Excellent linearity

• Excellent matching to 2% DMA

• Ultra small plastic SMD package

• C28: 2.6 pF; ratio: 15

• Very low series resistance.

APPLICATIONS

• Electronic tuning in VHF television

tuners, band B up to 460 MHz

• Voltage controlled oscillators

(VCO).

DESCRIPTION

The BB178 is a planar technology

variable capacitance diode, in a

SOD523 (SC-79) package. The

excellent matching performance is

achieved by gliding matching and a

direct matching assembly procedure.

PINNING

PIN

DESCRIPTION

1

cathode

2

anode

Fig.1 Simplified outline

(SOD523; SC-79) and symbol.

handbook, 2 columns

12



MBK441

Marking code: 8.

Orientation of marking code as shown.

Cathode side indicated by a bar.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

continuous reverse voltage

−

32

V

peak reverse voltage

in series with a 10 k

Ω resistor

−

35

V

continuous forward current

−

20

mA

storage temperature

−55

+150

°C

operating junction temperature

−55

+125

°C

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

reverse current

−−

10

nA

−−

200

nA

diode series resistance

f = 100 MHz;

−

0.65

0.8

Ω

diode capacitance

34.65

−

42.35

pF

−

2.754

pF

capacitance ratio

f = 1 MHz

−

1.3

−

capacitance ratio

f = 1 MHz

13.5

−−

capacitance ratio

f = 1 MHz

−

1.08

−

capacitance matching

diodes (gliding)

−−

2%

C

d1V

()

C

d2V

()

------------------

C

d1V

()

C

d28V

()

--------------------

C

d25V

()

C

d28V

()

--------------------

C

d

∆

C

d

----------