Overview
The MDC3105LT1 is an integrated relay and inductive load driver produced by onsemi. This device is designed to replace multiple discrete components with a single surface-mount technology (SMT) part, available in a SOT-23 package. It is optimized to switch 3 to 6 Vdc inductive loads such as relays, solenoids, incandescent lamps, and small DC motors without the need for a free-wheeling diode. The MDC3105LT1 provides a robust driver interface between DC relay coils and sensitive logic circuits, ensuring reliable and efficient operation.
Key Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Power Supply Voltage | VCC | 6.0 | Vdc |
| Input Voltage (Forward) | Vin(fwd) | 6.0 | Vdc |
| Reverse Input Voltage | Vin(rev) | -0.5 | Vdc |
| Repetitive Pulse Zener Energy Limit (Duty Cycle ≤ 0.01%) | Ezpk | 50 | mJ |
| Output Sink Current - Continuous | IO | 500 | mA |
| Junction Temperature | TJ | 150 | °C |
| Operating Ambient Temperature Range | TA | -40 to +85 | °C |
| Storage Temperature Range | Tstg | -65 to +150 | °C |
Key Features
- Provides a robust driver interface between DC relay coils and sensitive logic circuits.
- Optimized to switch relays from a 3.0 V to 5.0 V rail.
- Capable of driving relay coils rated up to 2.5 W at 5.0 V.
- Features low input drive current and good back-to-front transient isolation.
- Internal Zener clamp eliminates the need for a free-wheeling diode and routes induced current to ground for quieter system operation.
- Guaranteed off state with no input connection.
- Supports large systems with minimal off-state leakage.
- ESD resistant in accordance with the Class 1C Human Body Model.
- Low saturation voltage reduces system current drain by allowing the use of higher resistance relay coils.
- Pb-free and halide-free packaging.
Applications
- Telecom: Line cards, modems, answering machines, FAX machines, feature phone electronic hook switch.
- Computer and Office: Photocopiers, printers, desktop computers.
- Consumer: TVs and VCRs, stereo receivers, CD players, cassette recorders, TV set-top boxes.
- Industrial: Small appliances, white goods, security systems, automated test equipment, garage door openers.
- Automotive: 5.0 V driven relays, motor controls, power latches, lamp drivers.
Q & A
- What is the primary function of the MDC3105LT1?
The MDC3105LT1 is an integrated relay and inductive load driver designed to switch 3 to 6 Vdc inductive loads such as relays, solenoids, and small DC motors.
- What package types are available for the MDC3105LT1?
The MDC3105LT1 is available in SOT-23 and SC-74 packages.
- What is the maximum power supply voltage for the MDC3105LT1?
The maximum power supply voltage is 6.0 Vdc.
- What is the maximum output sink current for the MDC3105LT1?
The maximum output sink current is 500 mA.
- What is the operating ambient temperature range for the MDC3105LT1?
The operating ambient temperature range is -40 to +85 °C.
- Does the MDC3105LT1 require a free-wheeling diode?
No, the MDC3105LT1 has an internal Zener clamp that eliminates the need for a free-wheeling diode.
- Is the MDC3105LT1 ESD resistant?
- What are some typical applications for the MDC3105LT1?
Typical applications include telecom, computer and office equipment, consumer electronics, industrial devices, and automotive systems.
- Is the MDC3105LT1 Pb-free and halide-free?
- How does the MDC3105LT1 handle back-to-front transient isolation?
The MDC3105LT1 features good back-to-front transient isolation, ensuring reliable operation.
