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- **Features**:
- Quad differential input voltage comparators
- Wide supply voltage range: 2 V to 36 V (single supply), ±1 V to ±18 V (dual supply)
- Low supply current: 0.8 mA (typical), independent of supply voltage
- Low input bias current: 25 nA (typical)
- Low input offset current: 3 nA (typical, LM139)
- Low input offset voltage: 2 mV (typical), 5 mV max @ 25°C
- Common-mode input voltage range includes ground
- Differential input voltage range equal to maximum rated supply voltage: ±36 V
- Low output saturation voltage
- Output compatible with TTL, MOS, and CMOS
- Open-collector output; supports Wired-AND connections
- Propagation delay: 300 ns (typical), 1.3 µs (maximum)
- Automotive-grade operating temperature range: -55°C to +125°C
Technical Specifications
- **Number of channels**: 4 (four independent comparators)
- **Output type**: Open-collector / Open-drain
- **Supply voltage range (single supply)**: 2 V to 36 V
- **Supply voltage range (dual supply)**: ±1 V to ±18 V
- **Input offset voltage (max)**: 5 mV @ 30 V
- **Input bias current (max)**: 0.1 µA @ 5 V (100 nA)
- **Input bias current (typical)**: 25 nA
- **Input offset current (typical)**: 3 nA
- **Output current (typical)**: 20 mA
- **Quiescent current (max)**: 2 mA
- **Propagation delay time**: 300 ns (typical), 1.3 µs (maximum)
- - **Common-mode input voltage range**: 0 V to VCC - 1.5 V (includes ground)
- **Differential input voltage range**: ±36 V
- **Operating temperature range**: -55°C to +125°C
- **Package type**: SOIC-14 (D package, 0.154" / 3.90 mm wide)
- **Mounting type**: Surface Mount (SMT)
- **Packaging**: Tape & Reel (2,500 units/reel)
- **RoHS status**: Lead-free / RoHS compliant (G4 suffix indicates the eco-friendly version)
- **Product lifecycle**: Active (in mass production)
Notes
- **Compatibility**: Please verify compatibility with your application before purchase.
- Package match: SOIC-14 (14-pin, 3.90 mm wide); verify PCB pad design
- Supply voltage: Single supply 2V–36V or dual supply ±1V–±18V
- Output type: Open-collector; requires an external pull-up resistor to the positive supply
- Temperature range: -55°C to +125°C (automotive grade); ensure the application's ambient temperature is within this range
- Suffix distinction: DR = Tape & Reel, D = Tube, G4 = Eco-friendly version
- **Installation instructions**:
- ESD protection: The chip is sensitive to electrostatic discharge; wear an anti-static wrist strap before handling
- Soldering temperature: Reflow peak temperature ≤260°C; compliant with lead-free soldering standards
- Pull-up resistor: Open-collector output requires an external pull-up resistor (typically 1kΩ–10kΩ) connected to VCC
- Decoupling capacitor: A 0.1 µF ceramic decoupling capacitor connected in parallel from the VCC pin to ground is recommended
- Input protection: Differential input voltage can reach ±36V, but avoid prolonged operation exceeding the supply voltage
- Operate the device within the specified temperature range
- **Troubleshooting**:
- Output stuck low: Check if the pull-up resistor is connected, verify the VCC supply is normal, and ensure the input signal is within the common-mode range.
- No output response: Check if the input signal exceeds the differential voltage range and verify if the chip is damaged.
- Slow response speed: Check if the load capacitance is excessive and ensure the pull-up resistor value is appropriate.
- Abnormal power consumption: Check if the quiescent current exceeds 2 mA and verify if there is an output short circuit.
- Output conflict with multiple chips in parallel: Ensure that the outputs of the chips do not conduct simultaneously, which would cause a short circuit.
- **Alternative Model References**:
- LM139D (SOIC-14 tube packaging version)
- LM139ADR (High-precision version, input offset voltage 2 mV max)
- LM139J (CDIP-14 ceramic dual in-line package)
- LM239DR (Industrial grade, -25°C to +85°C)
- LM339DR (Commercial grade, 0°C to +70°C)
- LM2901DR (Automotive grade extended temperature, -40°C to +125°C)
- Select alternative models based on specific temperature grade and precision requirements.
- **Technical Support**: For further technical support, it is recommended to contact Texas Instruments or a professional electronic component distributor.
Summary
The LM139DR is a quad differential-input voltage comparator manufactured by Texas Instruments, housed in an SOIC-14 package. Its wide supply voltage range (2V–36V single supply / ±1V–±18V dual supply), low power consumption (0.8 mA typical quiescent current), low input bias current (25 nA), low input offset voltage (2 mV typical, 5 mV maximum), and automotive-grade operating temperature range (-55°C to +125°C) make it an ideal choice for high-reliability applications such as automotive electronics, industrial control, instrumentation, and power management. The chip's open-collector output supports wired-AND connections and parallel operation with multiple devices, and it is compatible with TTL, MOS, and CMOS logic. Logic levels. During maintenance, attention must be paid to package compatibility, pull-up resistor configuration, supply voltage range, and temperature grade selection to ensure stable system operation.
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