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STMicroelectronics LM239APT
- Part No.:
- LM239APT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM239APT.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,728
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Product details
Overview
LM239APT from STMicroelectronics is a low-power quad voltage comparator in TSSOP-14 package, designed for single-supply operation from +2 V to +36 V (or ±1 V to ±18 V dual supply), featuring 1.1 mA typical supply current, ±1 mV typical input offset voltage, and rail-to-rail input common-mode range including ground. It drives TTL, CMOS, and ECL loads with 250 mV typical low-level output saturation at 4 mA sink current, used in precision threshold detection and analog signal conditioning circuits.
For engineers reviewing the LM239APT datasheet, LM239APT pinout, LM239APT application, or LM239APT equivalent, key selection criteria include input offset voltage stability over temperature, output sink capability under varying supply conditions, compatibility with mixed-logic families, and thermal performance in compact PCB layouts using the TSSOP14 footprint.
Technical Context
This device integrates four independent comparators with PNP-input stages enabling ground-sensing capability on single supplies - critical for battery-powered and industrial sensor interfaces. Each comparator exhibits differential input voltage tolerance up to ±36 V and supports wide common-mode input range (0 V to VCC − 1.5 V) without phase reversal.
Its open-collector outputs allow wired-OR logic and flexible pull-up configuration across voltage domains. The 1.3 µs typical response time (100 mV step, 5 mV overdrive) and 300 ns large-signal response enable use in timing-critical zero-crossing and window-detection applications up to ~100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2 V to +36 V single supply or ±1 V to ±18 V dual supply - enables direct interface with 3.3 V, 5 V, 12 V, and 24 V systems without level-shifting. |
| Input Offset Voltage | ±1 mV typ - ensures accurate threshold detection within ±10 mV error at room temperature for 10× gain reference circuits. |
| Supply Current (all 4) | 1.1 mA typ at +5 V - supports ultra-low-power operation in always-on monitoring nodes with <5.5 mW total quiescent dissipation. |
| Input Bias Current | 25 nA typ - minimizes loading error on high-impedance sources like thermistors or photodiodes (>100 MΩ source impedance). |
| Output Saturation Voltage | 250 mV typ at ISINK = 4 mA - guarantees reliable TTL/CMOS logic low assertion even with 4.7 kΩ pull-up to 5 V. |
| Response Time | 1.3 µs typ (100 mV step, 5 mV overdrive) - suitable for line-frequency zero-crossing detection and slow PWM feedback loops. |
| Common-Mode Input Range | Includes ground (0 V) up to VCC − 1.5 V - allows direct sensing of signals referenced to system ground in single-supply configurations. |
Pinout & Package
TSSOP14 (Thin Shrink Small Outline Package), 4.9 mm × 6.4 mm body, 0.65 mm pitch, 1.0 mm max height - optimized for automated assembly and space-constrained industrial control PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | Comparator Inputs (IN+, IN−) | Four independent differential input pairs; each pair accepts inputs from −0.3 V to VCC + 30 V (with common-mode limited to 0 V–VCC−1.5 V). |
| 3, 6, 10, 13 | Open-Collector Outputs | Active-low outputs requiring external pull-up; sink ≥6 mA at VOL ≤ 400 mV (max), compatible with 3.3 V/5 V/12 V logic families. |
| 14 | VCC | Positive supply pin for all four comparators; supports wide voltage range and must be decoupled locally with ≥100 nF ceramic capacitor. |
| 7 | GND | Ground reference for all comparators and outputs; shared return path requires low-impedance layout to avoid noise coupling between channels. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply ground-sensing input | Enables direct comparison of 0–5 V sensor outputs against grounded references without negative rail or level shifters. |
| Low quiescent current | 1.1 mA total for four comparators - extends battery life in portable instrumentation and remote sensors. |
| Wide supply voltage range | +2 V to +36 V operation - eliminates need for separate voltage regulators when interfacing with diverse power domains. |
| High ESD robustness | 500 V HBM rating - improves manufacturing yield and field reliability in handling-sensitive industrial environments. |
| Thermal resistance (RθJA) | 100 °C/W for TSSOP14 - supports continuous operation at full load up to +85 °C ambient with standard PCB copper area. |
Applications
| Overvoltage Protection Circuit | Zero-Crossing Detector |
|---|---|
|
Use Scenario: Monitoring DC bus voltage in motor drives to trigger shutdown if >32 V threshold is exceeded. IC Role / Device Role / Timing Role: Quad comparator configured as window detector with hysteresis, comparing sensed voltage against precision reference. Use Value: 1.1 mA supply current enables integration into safety-critical subsystems without adding thermal load; rail-to-rail input allows direct sensing from resistive divider without biasing. |
Use Scenario: Detecting AC line zero crossings in smart energy meters for synchronized sampling and TRIAC triggering. IC Role / Device Role / Timing Role: Single comparator channel biased at mid-rail to convert sine wave to clean square wave with minimal propagation delay variation. Use Value: 1.3 µs response time and ±1 mV offset ensure timing jitter <10 µs at 50/60 Hz; open-collector output interfaces directly to microcontroller GPIO with 5 V tolerant pull-up. |
| Transducer Signal Conditioning | Limit Comparator for Battery Monitoring |
|
Use Scenario: Amplifying and thresholding low-level magnetic pickup signals in industrial speed sensors. IC Role / Device Role / Timing Role: One comparator channel used with RC filter to reject EMI while detecting pulse edges from 100 mV peak transducer output. Use Value: 25 nA input bias current prevents signal attenuation across 20 MΩ transducer impedance; common-mode range including ground avoids DC blocking capacitors. |
Use Scenario: Monitoring lithium-ion cell voltage during charging to halt at 4.2 V and prevent overcharge. IC Role / Device Role / Timing Role: Dual comparators configured as high/low limit detector with internal reference or external resistor divider. Use Value: ±1 mV offset voltage ensures voltage trip accuracy within ±5 mV; TSSOP14 package allows dense placement near battery connector with minimal trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339APT | 0 °C to +70 °C operating range vs. LM239APT's −40 °C to +105 °C; otherwise identical electrical specs and pinout. | Not rated for automotive or extended industrial ambient temperatures; suitable only for commercial-grade consumer electronics. | Select LM339APT only when cost sensitivity outweighs temperature requirement and ambient stays below +70 °C. |
| TLV331IPWR | Rail-to-rail input/output, 60 µA supply current per comparator, but only single-channel; requires four units for quad function. | Lower power and wider input range, but increases board area, BOM count, and routing complexity versus monolithic quad solution. | Choose TLV331IPWR only when ultra-low power (<250 µA total) and rail-to-rail output swing are mandatory, and space allows discrete layout. |
Compared with LM339APT, LM239APT offers extended temperature capability critical for industrial control cabinets; compared with TLV331IPWR, it delivers integrated quad functionality with proven thermal margin in TSSOP14, reducing design risk and validation effort.
Availability
LM239APT is available at Aetrix Electronics and suitable for industrial motor control, smart metering, battery management systems, and sensor interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM239APT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The LM239 series belongs to ST's precision analog comparator product line, engineered specifically for robust, low-cost threshold detection in harsh environments where ground-referenced sensing and wide supply flexibility are essential.
FAQ
Can LM239APT operate from a 3.3 V supply?
Yes - LM239APT supports single-supply operation down to +2 V, making it fully functional at 3.3 V. At this voltage, input common-mode range extends from 0 V to 1.8 V, output saturation remains ≤400 mV at 4 mA sink, and supply current drops to ~0.9 mA. No derating or external components are required.
Does LM239APT require external hysteresis for noise immunity?
Yes - LM239APT has no built-in hysteresis. For noisy input signals (e.g., mechanical switch bounce or EMI-prone transducers), positive feedback via resistor network (e.g., 1 MΩ from output to non-inverting input) is required to add 10–50 mV hysteresis. This prevents multiple toggles near threshold and is documented in Figure 15 of the datasheet.
What is the maximum sink current per output of LM239APT?
The absolute maximum sink current is not specified, but electrical characteristics guarantee 6 mA minimum sink capability at VOL ≤ 400 mV (TA = 25 °C). Continuous operation above 10 mA risks exceeding junction temperature limits due to power dissipation; ST recommends limiting steady-state sink to ≤8 mA with adequate PCB copper for heat spreading.
Is LM239APT pin-compatible with LM339APT?
Yes - both LM239APT and LM339APT use identical TSSOP14 package and pinout, including VCC (pin 14), GND (pin 7), and all comparator inputs/outputs. The only difference is guaranteed operating temperature range: −40 °C to +105 °C for LM239APT versus 0 °C to +70 °C for LM339APT. Electrical parameters are identical across their respective temperature ranges.
LM239APT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- CMOS, DTL, ECL, MOS, Open-Collector, TTL
- Voltage - Supply, Single/Dual (±):
- 2V ~ 32V, ±1V ~ 16V
- :
- 2mV @ 30V
- Voltage - Input Offset (Max):
- 0.1µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 105°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-TSSOP
LM239APT FAQ
1.How can I place an order for LM239APT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM239APT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM239APT reliable?
The price and inventory of LM239APT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM239APT is usually 5 days.
3.What payment methods are accepted for LM239APT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM239APT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM239APT?
LM239APT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM239APT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM239APT?
For technical support, including LM239APT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM239APT requirements.
6.How does Aetrix verify that LM239APT is sourced from the original manufacturer or authorized distributors?
All LM239APT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM239APT meets industry standards.
7.What is the process for return or replacement of LM239APT?
All LM239APT units undergo pre-shipment inspection (PSI). If there is an issue with LM239APT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM239APT part is unused and in its original packaging.
Return procedure for LM239APT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM239APT Tags
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