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Texas Instruments LM339ADBR
- Part No.:
- LM339ADBR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LM339ADBR.pdf
- Description:
- IC COMPARATOR 4 DIFF 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
LM339ADBR from Texas Instruments is a quad differential comparator IC designed for precision voltage comparison in single-supply systems. It features ±38 V differential input voltage range, 0.37 mV typical input offset voltage, 200 µA per comparator supply current, and 1 µs propagation delay. It is widely used in server PSU overvoltage protection circuits.
For engineers reviewing the LM339ADBR datasheet, LM339ADBR pinout, LM339ADBR application, or LM339ADBR equivalent, this page delivers verified electrical specs, SOIC-14 package details, real-world use cases in industrial power monitoring, and validated alternative options with documented functional differences.
Technical Context
The LM339ADBR operates as an open-collector quad comparator with rail-to-rail input capability extending to ground and up to VCC – 2 V. Its internal architecture supports independent channel operation without crosstalk, enabling simultaneous threshold detection across four analog inputs.
It uses bipolar process technology optimized for wide supply range (2–36 V), low quiescent current scalability, and robust ESD tolerance (2 kV HBM). Input stage design allows one input to exceed VCC while maintaining valid output state if the other remains within common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - supports direct integration into 3.3 V, 5 V, 12 V, and 24 V industrial power rails without level-shifting. |
| Input Offset Voltage (max) | ±5.5 mV over temperature - enables accurate threshold detection down to ~5 mV differential in ambient and extended temp environments. |
| Propagation Delay | 1 µs typical - suitable for fast-response applications like overvoltage latch and PWM feedback comparators. |
| Input Bias Current (typ) | 3.5 nA - minimizes loading on high-impedance sensor outputs such as thermistor dividers or photodiode amplifiers. |
| Differential Input Range | ±38 V - allows direct comparison of signals referenced to different potentials, e.g., phase-to-phase voltages in AC-DC converters. |
| Output Sink Current | 21 mA - drives standard TTL/CMOS logic directly or interfaces with optocouplers and small-signal MOSFET gates without external buffers. |
| ESD Rating (HBM) | 2000 V - meets industrial handling requirements and reduces need for external ESD protection in board-level designs. |
Pinout & Package
LM339ADBR is packaged in a 14-pin SOIC (D) body measuring 8.70 mm × 3.90 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Comparator 1 output | Open-collector output requiring external pull-up; sinks current when IN1– > IN1+. |
| 2 (IN1–) | Comparator 1 inverting input | Accepts reference or sensed signal; common-mode range includes ground and extends to VCC – 2 V. |
| 3 (IN1+) | Comparator 1 non-inverting input | Accepts reference or sensed signal; same common-mode range as IN1–. |
| 4 (VCC) | Positive supply | Single supply input; supports 2–36 V operation with no negative rail required. |
| 5 (OUT2) | Comparator 2 output | Independent open-collector output; electrically isolated from OUT1. |
| 6 (IN2–) | Comparator 2 inverting input | Matches IN1– functionality; channels are fully independent. |
| 7 (IN2+) | Comparator 2 non-inverting input | Matches IN1+ functionality; no inter-channel coupling. |
| 8 (GND) | Negative supply / reference | System ground return; all inputs referenced to this node. |
| 9 (OUT3) | Comparator 3 output | Third independent open-collector output; identical sink capability and timing. |
| 10 (IN3–) | Comparator 3 inverting input | Same electrical behavior as IN1– and IN2–. |
| 11 (IN3+) | Comparator 3 non-inverting input | Same electrical behavior as IN1+ and IN2+. |
| 12 (OUT4) | Comparator 4 output | Fourth open-collector output; fully decoupled from other channels. |
| 13 (IN4–) | Comparator 4 inverting input | Supports fourth independent comparison path with full common-mode range. |
| 14 (IN4+) | Comparator 4 non-inverting input | Completes quad-channel input set; no shared biasing or loading effects. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent comparators | Enables simultaneous monitoring of four separate thresholds-e.g., overvoltage, undervoltage, overtemperature, and fan fail-in a single IC. |
| Ground-sensing input range | Allows direct interface with sensors tied to system ground without level-shifting circuitry or bias networks. |
| Open-collector outputs | Permits wired-OR logic, mixed-voltage interfacing (e.g., 3.3 V logic driving 5 V bus), and direct connection to optocoupler LEDs. |
| Low 200 µA per comparator supply current | Reduces standby power in always-on monitoring circuits-critical for energy-efficient server PSUs and battery-backed systems. |
| ±38 V differential input rating | Eliminates need for external attenuators when comparing high-side vs. low-side signals in DC-link monitoring or motor drive fault detection. |
Applications
| Vacuum Robot Power Monitoring | Server PSU Overvoltage Protection |
|---|---|
Use Scenario: Real-time monitoring of multiple DC bus rails (12 V, 5 V, 3.3 V) in vacuum robot motion controllers to trigger shutdown before capacitor overvoltage failure. IC Role / Device Role / Timing Role: Quad comparator performs parallel voltage window checking with independent hysteresis resistors per channel. Use Value: Prevents catastrophic MOSFET failure by detecting rail excursions within 1 µs and asserting hardware reset before damage occurs. | Use Scenario: Detecting overvoltage conditions on +12 V and +5 V outputs in redundant ATX-style server PSUs during transient load steps or regulator failure. IC Role / Device Role / Timing Role: LM339ADBR compares each output against precision references; outputs feed OR-gated latch to disable main PWM controller. Use Value: Meets IEC 62368-1 secondary circuit safety requirements by providing <100 ns response margin between OV detection and power removal. |
| Cordless Power Tool Battery Management | Building Automation Sensor Interface |
Use Scenario: Monitoring cell voltage imbalance and pack overvoltage in 18 V Li-ion battery packs used in cordless drills and impact drivers. IC Role / Device Role / Timing Role: Four comparators track individual cell voltages or grouped cells using resistor dividers; outputs drive LED indicators and cut-off FETs. Use Value: Enables precise 4.25 V/cell overvoltage cutoff with <±5.5 mV error budget, extending cycle life and meeting UL 2580 thermal runaway prevention guidelines. | Use Scenario: Converting analog outputs from HVAC temperature, humidity, and CO₂ sensors into digital status flags for BACnet MS/TP controllers. IC Role / Device Role / Timing Role: LM339ADBR acts as programmable threshold detector; each comparator maps one sensor to a discrete alarm zone (normal/warning/fault). Use Value: Eliminates microcontroller ADC polling overhead and provides deterministic, zero-latency alarm assertion for life-safety ventilation control loops. |
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 SOIC-14 package; identical electrical specs but rated only to 30 V max supply and ±9 mV max offset voltage at temperature. | Limited to lower-voltage applications (<30 V); not qualified for 36 V industrial rails or high-precision thresholds. | Select LM339DR only if operating below 30 V and offset tolerance >±9 mV is acceptable. |
| LM2901DBR | Same pinout and SOIC-14 package; extends temperature range to –40°C to +125°C and maintains ±5.5 mV offset spec across full range. | Better suited for automotive under-hood or industrial motor drive environments where ambient exceeds 85°C. | Choose LM2901DBR when extended temperature operation is required and full-spec performance must be guaranteed beyond 85°C. |
Compared with LM339DR, LM339ADBR offers higher supply voltage headroom (36 V vs. 30 V) and tighter offset stability; compared with LM2901DBR, it trades extended temperature coverage for cost optimization in commercial-grade 0°C to 85°C applications.
Availability
LM339ADBR is available at Aetrix Electronics and suitable for server PSU overvoltage protection, vacuum robot power sequencing, and cordless tool battery management requiring stable component supply and long-term industrial availability.
Supply support for LM339ADBR 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 and embedded processing solutions for industrial, automotive, and communications markets.
The LM339x family-including LM339ADBR-is engineered for reliable voltage comparison in cost-sensitive, high-volume power management and system monitoring applications across commercial and industrial equipment.
FAQ
What is the maximum supply voltage rating for LM339ADBR?
The LM339ADBR has an absolute maximum supply voltage rating of 38 V, with recommended operating range from 2 V to 36 V. This allows direct use in 24 V industrial systems and 36 V battery-powered tools without derating or external regulation. The 38 V rating provides 2 V margin above the 36 V upper limit, supporting transient surge resilience in unregulated supplies.
Does LM339ADBR support rail-to-rail input operation?
Yes, LM339ADBR supports rail-to-rail input common-mode range from ground (V–) up to VCC – 2 V. Either input can go to VCC without damage, and proper output state is maintained as long as at least one input stays within the valid common-mode window. This eliminates need for input clamping diodes in most single-supply configurations.
What is the typical input offset voltage of LM339ADBR and how does it vary with temperature?
The LM339ADBR has a typical input offset voltage of ±0.37 mV at 25°C, with a maximum of ±5.5 mV over the full operating temperature range of –40°C to +85°C. This tight offset enables accurate threshold detection in precision power monitoring, especially when paired with stable reference voltages and low-drift resistor networks.
Can LM339ADBR outputs drive CMOS logic directly?
LM339ADBR outputs are open-collector and require external pull-up resistors to interface with CMOS logic. With a properly sized pull-up (e.g., 10 kΩ to 3.3 V), the output achieves VOL ≤ 400 mV at 4 mA sink, satisfying standard 3.3 V CMOS VIH/VIL thresholds. No level-shifter is needed for 3.3 V or 5 V logic families.
Is LM339ADBR pin-compatible with older LM339 variants?
Yes, LM339ADBR is pin-compatible with standard LM339, LM239, and LM2901 in SOIC-14 packages. It retains identical pinout, electrical interface, and footprint, enabling drop-in replacement in existing designs-provided the 36 V supply and ±5.5 mV offset specifications meet system requirements.
LM339ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SSOP (0.209", 5.30mm 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 ~ 30V, ±1V ~ 15V
- :
- 3mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 20mA
- 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-SSOP
LM339ADBR FAQ
1.How can I place an order for LM339ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM339ADBR 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 LM339ADBR reliable?
The price and inventory of LM339ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM339ADBR is usually 5 days.
3.What payment methods are accepted for LM339ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM339ADBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM339ADBR?
LM339ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM339ADBR 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 LM339ADBR?
For technical support, including LM339ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM339ADBR requirements.
6.How does Aetrix verify that LM339ADBR is sourced from the original manufacturer or authorized distributors?
All LM339ADBR 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 LM339ADBR meets industry standards.
7.What is the process for return or replacement of LM339ADBR?
All LM339ADBR units undergo pre-shipment inspection (PSI). If there is an issue with LM339ADBR, 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 LM339ADBR part is unused and in its original packaging.
Return procedure for LM339ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM339ADBR Tags
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LM2903DR
Texas Instruments
-
LM339DR
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LM339PWR
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LM393DT
STMicroelectronics
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LM2901PWR
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LM2903DT
STMicroelectronics
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LM393DR
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LM239DR
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LM339APWR
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LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
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NCX2200GMAZ
NXP Semiconductors
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