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Texas Instruments LM339AMX/NOPB
- Part No.:
- LM339AMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM339AMX/NOPB.pdf
- Description:
- IC COMPARATOR 4 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:12,742
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Product details
Overview
LM339AMX/NOPB from Texas Instruments is a quad open-collector voltage comparator IC designed for industrial analog-to-digital interface applications. It features ±3 mV maximum input offset voltage, 0.8 mA typical supply current at 5 V, and an input common-mode range extending to ground-enabling direct sensing of low-side signals. It operates from single supplies (2–36 V) or dual supplies (±1 to ±18 V) and interfaces directly with TTL, CMOS, and ECL logic.
For engineers reviewing the LM339AMX/NOPB datasheet, LM339AMX/NOPB pinout, LM339AMX/NOPB application, or LM339AMX/NOPB equivalent, key selection considerations include its rail-to-ground input capability, uncommitted collector outputs for wired-OR logic, low quiescent current for battery-powered systems, and compatibility with legacy 14-pin SOIC layouts in industrial control and power monitoring circuits.
Technical Context
The LM339AMX/NOPB implements four independent high-gain comparators using PNP input stages, enabling input common-mode voltage down to GND even under single-supply operation. Its open-collector NPN output stage supports sink currents up to 16 mA and saturation voltages as low as 250 mV at 4 mA load.
No internal antisaturation clamps are used-resulting in ultra-low output leakage (0.1 nA typical) and true high-impedance OFF-state behavior. The bias network delivers supply-voltage-independent current draw across 2–36 V, making it suitable for wide-input-range industrial power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2–36 VDC single supply or ±1 to ±18 VDC dual supply - supports direct integration into 3.3 V, 5 V, 12 V, and 24 V industrial systems without level-shifting. |
| Input Offset Voltage | ±3 mV max - enables accurate threshold detection in precision limit-comparator and zero-crossing applications. |
| Supply Current | 0.8 mA typical per device (all four comparators active) - allows long-term operation in battery-backed or energy-constrained monitoring nodes. |
| Input Bias Current | 25 nA max - minimizes loading on high-impedance sensor sources such as thermistors or photodiodes. |
| Output Saturation Voltage | 250 mV at 4 mA sink - ensures reliable logic LOW assertion into TTL/CMOS inputs while maintaining low power dissipation. |
| Input Common-Mode Range | Includes GND to V+ −1.5 V - permits direct comparison of ground-referenced signals (e.g., current-sense shunt voltages) without external level shifters. |
| Response Time | 300 ns for 100-mV step with 5-mV overdrive - suitable for medium-speed pulse generation, window detection, and clock timing circuits. |
Pinout & Package
LM339AMX/NOPB is housed in a 14-pin SOIC package (8.65 mm × 3.91 mm body size), compatible with standard surface-mount assembly processes and legacy through-hole footprints via adapter boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 13, 14 | OUTPUT2 / OUTPUT1 / OUTPUT4 / OUTPUT3 | Open-collector NPN outputs - require external pull-up resistors; support wired-OR logic, level translation, and direct sinking into logic families. |
| 3 | V+ | Positive supply input - accepts 2–36 VDC; powers all four comparators and internal bias network. |
| 4, 6, 8, 10 | INPUT1− / INPUT2− / INPUT3− / INPUT4− | Inverting inputs - accept signals down to GND; used for reference or inverted signal comparison. |
| 5, 7, 9, 11 | INPUT1+ / INPUT2+ / INPUT3+ / INPUT4+ | Non-inverting inputs - accept signals down to GND; typically connected to sensed analog signals. |
| 12 | GND | Ground reference - serves as return path for supply and input common-mode; critical for stable operation with rail-to-ground inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-ground input common-mode range | Enables direct sensing of shunt-based current measurements and battery-cell voltages without external biasing networks. |
| Uncommitted open-collector outputs | Allows flexible logic-level translation (e.g., 5 V comparator driving 3.3 V MCU interrupt) and hardware OR-ing of multiple comparators. |
| Low 0.8 mA supply current | Supports always-on status monitoring in HVAC controllers, PLC I/O modules, and portable test equipment with minimal thermal impact. |
| ±3 mV max input offset voltage | Reduces false triggering in precision window comparators used for overvoltage/undervoltage lockout in DC power supplies. |
| 0.1 nA typical output leakage | Maintains high-impedance isolation when disabled-critical for multiplexed sensor arrays where leakage could corrupt adjacent channels. |
Applications
| Overvoltage Protection Circuit | Industrial Temperature Monitoring |
|---|---|
|
Use Scenario: Detects when a 24 V DC bus exceeds 26.5 V to trigger shutdown in motor drives or power converters. IC Role / Device Role / Timing Role: Quad comparator configured as window detector with hysteresis; two channels monitor upper/lower thresholds, third validates latch condition, fourth drives fault flag. Use Value: Eliminates need for dedicated supervisor ICs-reduces BOM count and PCB area while supporting custom trip points via resistor dividers. |
Use Scenario: Monitors thermistor voltage in a 4-channel HVAC zone controller to activate heating/cooling relays at setpoints. IC Role / Device Role / Timing Role: Each comparator independently compares thermistor divider output against fixed reference; outputs drive opto-isolated relay drivers. Use Value: Input common-mode range including GND allows direct connection to grounded thermistor networks-no level-shifting circuitry required. |
| Zero-Crossing Detection | Simple ADC Interface |
|
Use Scenario: Detects AC line zero crossings for phase-controlled dimmers and solid-state relay timing in lighting controls. IC Role / Device Role / Timing Role: One comparator channel compares rectified AC waveform against 0 V reference; output triggers microcontroller timer capture. Use Value: Input range includes GND under single supply enables direct AC coupling with series capacitor-no negative rail needed. |
Use Scenario: Converts analog sensor outputs (e.g., pressure transducer) into 2-bit digital codes for basic classification in embedded systems. IC Role / Device Role / Timing Role: Three comparators generate thermometer-code outputs; fourth provides ready strobe synchronized to conversion cycle. Use Value: Open-collector outputs allow direct wired-OR summation into MCU GPIO pins-eliminates external logic gates and reduces latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339DR | Same electrical specs and pinout; differs only in tape-and-reel packaging (DR = 2500-unit reel vs. AMX/NOPB = 2500-unit cut tape). | No functional difference; identical performance in all operating conditions and temperature ranges (0°C to 70°C). | Select LM339DR for automated SMT placement requiring full reel; LM339AMX/NOPB preferred for prototyping or low-volume hand assembly. |
| LM2901DT | Wider operating temperature range (−40°C to +85°C); otherwise identical architecture, pinout, and key parameters (offset, supply current, output drive). | Better suited for automotive under-hood or outdoor industrial enclosures where ambient exceeds 70°C. | Choose LM2901DT when extended temperature compliance is mandatory; LM339AMX/NOPB remains optimal for cost-sensitive commercial-grade applications. |
Compared with LM339DR and LM2901DT, the LM339AMX/NOPB offers identical core functionality in a cut-tape format optimized for design validation and small-batch production, while LM2901DT adds extended temperature resilience at marginally higher cost-making LM339AMX/NOPB the preferred choice for commercial industrial control and power management designs within 0°C–70°C ambient.
Availability
LM339AMX/NOPB is available at Aetrix Electronics and suitable for industrial control systems, power supply supervision, sensor interface modules, and embedded analog-digital conversion requiring stable component supply across multi-year production cycles.
Supply support for LM339AMX/NOPB 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.
The LM339AMX/NOPB belongs to TI's legacy precision comparator product line, engineered specifically for robust, low-cost, wide-supply industrial signal conditioning-emphasizing rail-to-ground input operation, open-collector flexibility, and long-term reliability in harsh environments.
FAQ
What is the operating temperature range for LM339AMX/NOPB?
The LM339AMX/NOPB is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with typical industrial control panels, power supplies, and instrumentation enclosures not exposed to extreme environmental conditions. For extended temperature applications (−40°C to +85°C), consider the LM2901DT variant instead of LM339AMX/NOPB.
Does LM339AMX/NOPB require dual power supplies?
No, LM339AMX/NOPB is designed for single-supply operation from 2 V to 36 V DC, with input common-mode voltage extending to ground-eliminating the need for dual supplies in most applications. Dual-supply operation (±1 V to ±18 V) is supported but not required; the device functions identically in either configuration. LM339AMX/NOPB achieves this via PNP input stage architecture.
Can LM339AMX/NOPB drive TTL and CMOS loads directly?
Yes, LM339AMX/NOPB outputs are open-collector NPN transistors capable of sinking up to 16 mA with 250 mV saturation voltage at 4 mA. When paired with appropriate pull-up resistors to VCC of the target logic family (e.g., 5 V for TTL, 3.3 V for CMOS), LM339AMX/NOPB provides fully compatible interfacing without additional level-shifting circuitry.
What is the maximum differential input voltage for LM339AMX/NOPB?
The LM339AMX/NOPB supports differential input voltages up to 36 V-exceeding its supply voltage without damage. However, individual input voltages must remain within −0.3 V to (V+ − 1.5 V) to ensure proper operation. This tolerance allows safe comparison of signals referenced to different potentials, provided clamp diodes protect against negative excursions below −0.3 V.
Is LM339AMX/NOPB pin-compatible with other LM339 variants?
Yes, LM339AMX/NOPB uses the industry-standard 14-pin SOIC package and shares identical pinout and electrical characteristics with LM339DR, LM339N, and LM2901 variants. All share the same functional block diagram, input/output behavior, and recommended operating conditions-enabling drop-in replacement across these part numbers in existing PCB layouts.
LM339AMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- Open-Collector
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 2mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
LM339AMX/NOPB FAQ
1.How can I place an order for LM339AMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM339AMX/NOPB 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 LM339AMX/NOPB reliable?
The price and inventory of LM339AMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM339AMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM339AMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM339AMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM339AMX/NOPB?
LM339AMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM339AMX/NOPB 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 LM339AMX/NOPB?
For technical support, including LM339AMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM339AMX/NOPB requirements.
6.How does Aetrix verify that LM339AMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM339AMX/NOPB 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 LM339AMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM339AMX/NOPB?
All LM339AMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM339AMX/NOPB, 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 LM339AMX/NOPB part is unused and in its original packaging.
Return procedure for LM339AMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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