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L6221A-L6221AD-L6221N
QUAD DARLINGTON SWITCH
L622 1A L6221AD 6221N
July 1998
QUAD DARLINGTON SWITCH FOUR NON INVERTING INPUTS WITH
ENABLE. OUTPUT VOLTAGE UP TO 50 V. OUTPUT CURRENT UP TO 1.8 A. VERY LOW SATURATION VOLTAGE. TTL COMPATIBLE INPUTS. INTEGRAL FAST RECIRCULATION DIODES
DESCRIPTION

The L6221 monolithic quad darlington switch is de-
signed for high current, high voltage switching appli-
cations. Each of the four switches is controlled by a
logic input and all four are controlled by a common
enable input. All inputs are TTL-compatible for direct
connection to logic circuits.
Each switch consists of an open-collector darlington
transistor plus a fast diode for switching applications
with inductive device loads. The emitters of the four
switches are commoned. Any number of inputs and
outputs of the same device may be paralleled.
BLOCK DIAGRAM

1/15
PIN CONNECTIONS (top views)
THERMAL DATA
L6221A - L6221AD - L6221N

2/15
PIN FUNCTIONS (see block diagram)
For each input : H = High level
L = Low level
TRUTH TABLE
ABSOLUTE MAXIMUM RATINGS
L6221A - L6221AD - L6221N

3/15
ELECTRICAL CHARACTERISTICS
Refer to the test circuit to Fig. 1 to Fig. 9 (VS = 5V, Tamb = 25o C unless otherwise specified)
L6221A - L6221AD - L6221N

4/15
TEST CIRCUITS
(X) = Referred to Multiwatt package
X = Referred to Powerdip package
Figure 1 : Logic supply current.

Set V IN = 4.5V, V EN = 0.8V, or V IN = 0.8V, V EN = 4.5V, for I S (all outputs off)
Set V IN = 2V, V EN = 2V, for I S (all outputs on)
Figure 2 : Output Sustaining Voltage. Figure 3 : Output Leakage Current.
L6221A - L6221AD - L6221N

5/15
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