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Product Detailed Parameters
- Description：IC COMPARATOR 4 DIFF 16QFN
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：General Purpose
- Number of Elements：4
- Output Type：CMOS, DTL, ECL, MOS, Open-Collector, TTL
- Voltage - Supply, Single/Dual (±)：2V ~ 36V, ±1V ~ 18V
- Voltage - Input Offset (Max)：5mV
- Current - Input Bias (Max)：0.25µA @ 5V
- Current - Output (Typ)：16mA @ 5V
- Current - Quiescent (Max)：2mA
- CMRR, PSRR (Typ)：-
- Propagation Delay (Max)：-
- Hysteresis：-
- Operating Temperature：-40°C ~ 105°C
- Package / Case：16-VFQFN Exposed Pad
- Mounting Type：Surface Mount
- Supplier Device Package：16-QFN (3x3)
- Grade：-
- Qualification：-
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Overview
The LM239QT is a quad precision voltage comparator manufactured by STMicroelectronics, housed in a QFN-16 surface-mount package. It operates on a single supply voltage ranging from 2 V to 32 V or dual supplies of ±1 V to ±18 V. The device features four independent channels with a typical response time of 1.3 µs and a quiescent supply current of approximately 2 mA. Key electrical specifications include an input offset voltage of 5 mV, an input bias current of 250 nA, and an output sink current capability of 4 mA per channel. It supports a wide operating temperature range from -40 °C to +105 °C.
Feature Summary
- Four independent precision voltage comparators designed for single or split power supply operation
- Input common-mode voltage range includes ground potential even with single supply
- Outputs compatible with TTL, DTL, ECL, MOS, and CMOS logic families
- Low input bias current and low output saturation voltage characteristics
Applications
- Precision voltage monitoring circuits
- Analog-to-digital converter interface stages
- Over-voltage protection detection systems
Procurement Notes
Verify the specific suffix QT indicates the QFN-16 package configuration as distinct from other LM239 variants. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure design compatibility with the specified thermal performance limits for the target operating environment.
Selection Notes
Select this component when a compact surface-mount solution is required for multi-channel comparison tasks. The QFN-16 package offers space efficiency compared to traditional DIP or SOIC options. Consider the 5 mV offset voltage specification against application accuracy requirements relative to higher-grade A-series devices.
Part Context
This part belongs to the LM239 family of analog comparators, which are widely used for general-purpose signal conditioning. The LM239 series is known for its ability to operate from a single supply while including ground in the input common-mode range, making it suitable for battery-powered and low-voltage applications.
Replacement Considerations
LM239DT (SOIC-14 package), LM239APT (TSSOP-14 package). Verify pinout and thermal characteristics match the existing PCB layout before substitution.
