L3845B

trunk interface, 150 mA, DIP-8, 800 mW, L3845B, 20V

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Price:: US $0.50~1.00 / piece [Get Latest Price]

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Qty (lots)	Price/lot
1 ~ 50 :	1.00 / Piece
51 ~ 500 :	0.75 / Piece
501 ~ 5000 :	0.50 / Piece

PartNumber:: L3845B

Brand:: STMicroelectronics - ST | Pack: DIP | D/C: 12+

Availability:: Supply Ability: 20000/Day Can Ship Immediately
Delivery: 10-15 Business Days (ships out within 3 Business days)

Quantity:: piece

Total Price:: US $0

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Products Upload time: 2013-10-19

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Part Number:L3845B
US $0.50 - 1.00
Quantity:

piece

Product Summary

The L3845B is a trunk interface. The L3845B provides DC loop termination for analog trunk lines. The V-I characteristics is equivalent to a fixed voltage drop (zener like characteristic) in series with an external resistance that determines the slope of the DC characteristic. An external low voltage electrolytic capacitor causes the L3845B to exhibit a very high impedance to all AC signal above a minimum frequency that is determined by the capacitor itself and by a 20 K nominal resistor integrated on the chip. The Off-Hook status is detected all the time a typic of 8 mA is flowing into the circuit. In this condition a constant current generator is activated to supply an external device(typically an optocoupler) without affecting the AC characteristic of the circuit. When Pulse Dialing is required the PULSE input (pin 3) connected to V- causes the L3845B to reduce the fixed DC voltage drop and to exhibit a pure resistive impedance equal to the external resistor.

Parametrics

L3845B absolute maximum ratings: (1)VL Max Line Voltage (pulse duration 10 ms max): 20 V; (2)IL Max Line Current: 150 mA; (3)Ptot Total Power Dissipation at Tamb = 70 ℃: 800 mW; (4)Top Operating Temperature: - 40 to + 70 ℃; (5)Tsrg, Tj Storage and Junction Temperature: - 55 to + 150 ℃.

Features

L3845B features: (1)on chip polarityguard; (2)meets dc line characteristics of; (3)either ccitt and eia rs 464 specs; (4)pulse function; (5)high ac impedance; (6)off hook-status detection output; (7)low external component count.