AS1700-NPN View Datasheet(PDF) - Astec Semiconductor => Silicon Link
Part Name
Description
Manufacturer
AS1700-NPN Datasheet PDF : 20 Pages
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Semicustom Bipolar Array
AS17xx
Typical Performance Curves
VBE vs IC Over Temperature
(– 55° C to 125° C)
1500
1400
VCE = 3 V
Lateral PNP
1300
1200
T = –55° C
1100
1000
900
800
T = 0° C
T = 25° C
T = 70° C
700
600
T = 125° C
500
400
300
1 µA
10 µA
100 µA
1 mA
Current IC
10 mA
VBE vs IC Over Temperature
(– 55° C to 125° C)
1100
1000 Forced Beta: β = 1
900
800
T = –55° C
700
T = 0° C
600
500
400
300
1 µA
T = 125° C
10 µA
T = 25° C
T = 70° C
Lateral PNP
100 µA
Current IC
10 mA
100 mA
Figure 35
Figure 36
The Semicustom Application
The Design Considerations
The designer should take advantage of the resis-
tor and transistor matching available with ICs
and not rely on the absolute values of param-
eters. If a certain emitter area is desired for
current ratioing, several transistors can be
connected in parallel to simulate this condition,
or by using the desired emitter area of an NPN
power device (when breadboarding use the
previous method). When using the double-
collector PNP transistors, do not float one of the
collectors; either tie them together or tie one to
the substrate. Floating one of the collectors will
severely reduce the beta. There are several
values and types of resistors available on the
AS17xx semicustom array as outlined in the
resistor summary.
Resistor Summary
8 - Pinch Resistors
(≈30 kΩ ± 50%, use at ≤ 5 V)
80 - Base String Resistors
Using full string lengths gives:
73 – 4 kΩ
7 – 1.5 kΩ
Using separate pieces of the strings
gives:
67 – 500 Ω
63 – 1 kΩ
43 – 2 kΩ
30 – 4 kΩ
Note: Do not try to use one resistor string for more than one
resistor unless they are connected together in the circuit.
Additional components and their resistances
are as follows:
13 - Cross-unders (370 Ω for full length, and
190 Ω for half length)
6 - Buses (at 10 Ω between connection
points)
ASTEC Semiconductor
127
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