CLT3-4BT6

Maximum Power Dissipation :
Mounting Style : SMD/SMT
Maximum Operating Temperature : + 85 C
Package / Case : TSSOP-20
Product Type : Digital Termination
Operating Supply Voltage : 10 V
Supply Current : 0.0008 A


Features:

4channelstopology
WiderangeinputDCVoltage:
V₁=-0.3 to 30V with R₁=0
V₁=-30 to 35V withR₁ =1.2k
Lowsideconfigurationwithcommonground
Currentlimiter:
I_GEN=3mA
Inputcurrentlimiteractivationvoltage<5V
Temperaturecompensatedoperation
Opto-couplerdrive:
Nocoupleractivationbelow1.5mAinputcurrent
Inputprotection(R1=1.2K?):
IEC61000-4-2 electrostatic dischargeESD,Class3
Incontact,±6kV;in air,±8V
LevelB:temporarydisruption;nochangeofopto-couplerstate
IEC61000-4-5voltagesurge,Class3
±1000V with 42 serial resistor in differential mode
LevelB:temporary disruption
IEC61000-4-4transientburstimmunity
±4kV peak voltage;5kHz repetitive rate
LevelA:fully functional
Operating ambient temperature:-25 to85


Application

Industrial Automation
Programmable Logic Controller
Communication field busnodes
Peripheral Input/Output modules
Machine too linterface


Pinout




Specifications

Symbol	Pin	Parameter name & conditions	Value	Unit
VCC	VC	Supply steady state voltage, RC = 0kW	- 0.3 to 30	V
		Supply steady state voltage, RC = 4.7kW	- 0.3 to 35	V
VI (1)	IN	Input steady state voltage, RI = 0kW	- 0.3 to 30	V
		Input steady state voltage, RI = 1.2kW	- 0.3 to 32	V
		Input repetitive pulse voltage, RI = 1.2kW	- 0.3 to 35	V
		Input repetitive pulse voltage, RI = 1.2kW, RC = 4.7kW (2)	- 0.3 to 30	V
IIN	IN	Input maximum forward current, RI = 1.2kW, RC = 4.7kW	5	mA
		Input maximum reverse current, RI = 1.2kW, RC = 4.7kW (2)	20	mA
VOM	OUT	Maximum output steady state voltage	2.5	V
IOM	OUT	Output current	- 4 to 4	mA
TAMB	AII	Operating ambient temperature	- 25 to 85	°C
TJ		Operating and storage junction temperature	- 25 to 150	°C

Description

The CLTx-4 is a quadruple input digital termination device designed for 24 V DC automation applications. CLT3-4BT6 achieves the front-end circuitry of a digital input module (I/O) in industrial automation, and drives an isolating opto-coupler.

Available in a four channels configuration, CLT3-4BT6 offers a high-density termination by minimizing the external components count. CLT3-4BT6 is housed in a TSSOP20 surface mount package to reduce the printed board size. Made of an input voltage protection, a serial current limiting circuit and an opto-coupler driver, each channel circuit terminates the connection between the logic input and the associated high side sensor or switch.

The CLT3-4 is a 3 mA quad channel device compatible the type 1 characteristics of the IEC61131-2 standard.

Each input voltage clamping block protects CLT3-4BT6 input against electromagnetic interferences such as those described in the IEC61131-2 standard and IEC61000-4-2 (ESD), 4-4 (transient burst), 4-5 (voltage surge) standards. The supply input is also designed with such a protection structure.

The current limiting circuit connected between the input and the output pins is compensated all over the temperature range. Thanks to CLT3-4BT6's low tolerance, the current limitation allows reducing drastically the dissipation of the input compared to a resistive input: the overall module requires less cooling capability and becomes smaller.

The output block of each termination channel controls the operation of an opto-coupler that is enabled by CLT3-4BT6 Light Emitting Diode.

When CLT3-4BT6 input current is less than 1.5 mA, this output circuit derivates the input current to maintain theopto-coupler off.

The original structure of the CLT limiter allows CLT3-4BT6's activation threshold to be low and insensitive to the output voltage up to a maximum value of 2.0 V.

When the CLT input voltage VIN is higher than 5 V, or CLT3-4BT6 input voltage Vi higher than 11 V with the use of a reverse diode and a serial resistor RI = 1.2 kW, the output current that is a share of the input current (3/4) is higher than 1.5 mA. The whole termination channel including the opto-coupler is on.


Parameters:

Technical/Catalog Information	CLT3-4BT6
Vendor	STMicroelectronics
Category	Circuit Protection
Package / Case	20-TSSOP
Packaging	Tube
Technology	Mixed Technology
Applications	General Purpose
Number of Circuits	4 - Quad
Voltage - Working	-
Voltage - Clamping	-
Power (Watts)	-
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	CLT3 4BT6 CLT34BT6