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Quad Telephone Relay Drivers


Package | PIN: D | 14
Temp: C (0 to 70)
Carrier: Partial Tube
Qty Price
1-9 $1.04
10-24 $0.93
25-99 $0.86
100-249 $0.73
250-499 $0.68
500-749 $0.55
750-999 $0.44
1000+ $0.40


  • Designed for -52-V Battery Operation
  • 50-mA Output Current Capability
  • Input Compatible With TTL and CMOS
  • High Common-Mode Input Voltage Range
  • Very Low Input Current
  • Fail-Safe Disconnect Feature
  • Built-in Output Clamp Diode
  • Direct Replacement for National DS3680 and Fairchild uA3680

Texas Instruments  DS3680D

The DS3680 telephone relay driver is a monolithic integrated circuit designed to interface -48-V relay systems to TTL or other systems in telephone applications. It is capable of sourcing up to 50 mA from standard -52-V battery power. To reduce the effects of noise and IR drop between logic ground and battery ground, these drivers are designed to operate with a common-mode input range of ±20 V referenced to battery ground. The common-mode input voltages for the four drivers can be different, so a wide range of input elements can be accommodated. The high-impedance inputs are compatible with positive TTL and CMOS levels or negative logic levels. A clamp network is included in the driver outputs to limit high-voltage transients generated by the relay coil during switching. The complementary inputs ensure that the driver output is off as a fail-safe condition when either output is open.

The DS3680 is characterized for operation from 0°C to 70°C.