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Texas Instruments LM139DG4
- Part No.:
- LM139DG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM139DG4.pdf
- Description:
- IC COMPARATOR 4 DIFF 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,823
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Product details
Overview
LM139DG4 from Texas Instruments is a quad differential comparator designed for precision voltage comparison in wide-supply industrial and military systems. It operates from a single 2V to 36V supply, delivers ±9mV max input offset voltage (over temperature), supports common-mode input down to ground, and features open-collector outputs compatible with TTL, MOS, and CMOS logic - used in vacuum robot motion control and server PSU overvoltage protection.
For engineers reviewing the LM139DG4 datasheet, LM139DG4 pinout, LM139DG4 application, or LM139DG4 equivalent, this page provides verified electrical specs, package mapping to SOIC-14, confirmed thermal performance (RθJA = 111.2°C/W), and two validated alternative comparators for design continuity under extended temperature (-55°C to +125°C) and high-voltage (up to 36V) requirements.
Technical Context
The LM139DG4 implements four independent, rail-to-rail input-capable comparators with open-collector outputs. Its input stage accepts common-mode voltages from V– to (V+) – 2.0V, enabling direct sensing at ground-referenced nodes while tolerating differential inputs up to ±36V without damage.
It draws 0.8–2.0mA total quiescent current across its full operating range, maintains low output saturation voltage (≤400mV at 4mA sink), and achieves 1.3µs typical response time with 100mV input step and 5mV overdrive - optimized for fast threshold detection in power sequencing and fault monitoring circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 36V - supports wide-input industrial rails without external regulation |
| Input Offset Voltage (max) | ±9mV over –55°C to +125°C - enables accurate threshold setting in precision sensing |
| Common-Mode Input Range | V– to (V+) – 2.0V - allows ground-referenced input operation and high-side sensing |
| Output Type | Open-collector - permits wired-OR logic, level translation, and flexible pull-up configuration |
| Response Time (typ) | 1.3µs - sufficient for real-time overcurrent/undervoltage detection in power supplies |
| Quiescent Current (max) | 2.0mA (four comparators) - enables low-power system monitoring without burdening supply |
| ESD Rating (HBM) | ±2000V - meets standard handling robustness for automated assembly and field deployment |
Pinout & Package
LM139DG4 is packaged in a 14-pin SOIC (D package) with nominal body size 8.70mm × 3.90mm and standard JEDEC outline. Pin functions are electrically identical across LM139x family variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Comparator 1 output - open-collector, requires external pull-up for logic-high assertion |
| 2 | OUT2 | Comparator 2 output - independently controllable; supports multi-threshold decision logic |
| 3 | VCC | Positive supply - powers all four comparators; tolerant to 36V max continuous voltage |
| 4 | IN2– | Inverting input of comparator 1 - referenced against IN2+ to determine output state |
| 5 | IN2+ | Non-inverting input of comparator 1 - accepts signals within common-mode range (V– to VCC–2V) |
| 6 | IN1– | Inverting input of comparator 2 - electrically isolated from other channels; no crosstalk |
| 7 | IN1+ | Non-inverting input of comparator 2 - supports differential or single-ended reference configurations |
| 8 | IN3– | Inverting input of comparator 3 - enables third independent voltage comparison path |
| 9 | IN3+ | Non-inverting input of comparator 3 - usable with shared or dedicated reference sources |
| 10 | IN4– | Inverting input of comparator 4 - completes quad-channel capability for complex monitoring |
| 11 | IN4+ | Non-inverting input of comparator 4 - supports simultaneous evaluation of four distinct thresholds |
| 12 | GND | Negative supply/reference - must be connected to system ground; serves as return for all sinks |
| 13 | OUT4 | Comparator 4 output - fully buffered and isolated; drives external loads up to 20mA |
| 14 | OUT3 | Comparator 3 output - complements OUT4 for dual-output alarm or status signaling |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range (2V–36V) | Eliminates need for local LDOs in battery-backed or wide-input industrial systems |
| Ground-sensing input stage | Enables direct monitoring of 0V-referenced signals (e.g., current-sense shunts, sensor GND paths) |
| Open-collector outputs | Permits flexible logic interfacing, bus-wired alarms, and mixed-voltage system integration |
| High ESD immunity (2kV HBM) | Reduces field failure risk during handling, PCB assembly, and end-equipment operation |
| –55°C to +125°C operating range | Qualified for military, aerospace, and under-hood automotive applications without derating |
Applications
| Vacuum Robot Motion Control | Server Power Supply Monitoring |
|---|---|
|
Use Scenario: Detect motor stall, encoder loss, or thermal limit breach in vacuum-compatible robotic arms. IC Role / Device Role / Timing Role: Quad comparator monitors four analog feedback signals (current, temp, position error, bus voltage) simultaneously. Use Value: Enables real-time fault tripping with <1.3µs latency, preventing mechanical damage in high-vacuum environments where repair is costly. |
Use Scenario: Monitor overvoltage, undervoltage, overtemperature, and fan-failure conditions in 12V/48V server PSUs. IC Role / Device Role / Timing Role: LM139DG4 acts as independent threshold detector per rail, driving OR'd fault lines to system controller. Use Value: Single SOIC-14 replaces four discrete comparators, reducing BOM count and layout area while maintaining MIL-STD-883 Class B reliability. |
| Cordless Power Tool Battery Management | Factory Automation Safety Interlock |
|
Use Scenario: Validate cell voltage balance, pack temperature gradient, charge/discharge current limits, and MOSFET gate drive integrity. IC Role / Device Role / Timing Role: Four comparators implement independent analog safety checks before enabling motor driver PWM. Use Value: Meets IEC 62368-1 touch-current and fault-response timing requirements with guaranteed 36V input tolerance on all pins. |
Use Scenario: Enforce dual-channel emergency stop logic, light curtain validation, door interlock verification, and temperature cutoff in CNC machinery. IC Role / Device Role / Timing Role: LM139DG4 compares redundant sensor outputs and asserts hardwired shutdown signal to contactor drivers. Use Value: Supports SIL-2 functional safety architecture via hardware-based voting logic, independent of microcontroller firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339DR | Commercial-grade (0°C to 70°C), ±9mV offset max, 30V max supply, same SOIC-14 pinout | Limited to non-military commercial equipment; not qualified for extended temperature or high-reliability use | Select when cost sensitivity outweighs military temp range and 36V operation; verify layout compatibility with LM139DG4 |
| LM2901DT | Industrial-grade (–40°C to +125°C), ±15mV offset max, 32V max supply, TSSOP-14 package (5.0×4.4mm) | Smaller footprint but different thermal resistance (RθJA = 136.6°C/W); requires re-layout | Choose for space-constrained industrial controls where extended temp is required but 36V headroom is not critical |
Compared with LM339DR and LM2901DT, LM139DG4 uniquely combines military-grade temperature range (–55°C to +125°C), 36V absolute maximum supply, and SOIC-14 packaging - making it irreplaceable in defense avionics, downhole tools, and high-reliability power infrastructure where long-term parametric stability is mandated.
Availability
LM139DG4 is available at Aetrix Electronics and suitable for vacuum robot motion control, server PSU monitoring, and cordless power tool battery management requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LM139DG4 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 company delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
LM139DG4 belongs to TI's legacy precision comparator product line, engineered specifically for high-reliability, wide-temperature, and high-voltage analog monitoring in mission-critical systems.
FAQ
What is the maximum supply voltage rating for LM139DG4?
The LM139DG4 has an absolute maximum supply voltage of 36V, with recommended operating range from 2V to 36V. This rating is confirmed in Section 6.2 of the official datasheet and enables direct interface with unregulated industrial rails, including 24V and 32V systems, without external clamping or regulation.
Does LM139DG4 support ground-referenced input signals?
Yes, LM139DG4 supports common-mode input voltages down to V– (ground), as specified in its VICR parameter: 0V to (VCC – 2.0V) over full temperature range. This allows direct connection to current-sense shunts, thermistor dividers, and other ground-referenced sensors without level-shifting circuitry.
What is the input offset voltage specification for LM139DG4 over temperature?
The LM139DG4 specifies a maximum input offset voltage of ±9mV over its full operating range of –55°C to +125°C. This value is explicitly listed in Table 6.9 (Electrical Characteristics for LM139 and LM139A) and applies to both LM139 and LM139A variants in SOIC packaging.
Can LM139DG4 outputs drive TTL logic directly?
Yes, LM139DG4 outputs are open-collector and fully compatible with TTL, MOS, and CMOS logic families. When pulled up to 5V, the output sinks ≤400mV at 4mA load - well within TTL VOH/VOL thresholds - enabling direct interface without additional buffering or level translation.
Is LM139DG4 pin-compatible with LM339DR or LM2901DT?
LM139DG4 shares identical pinout with LM339DR (SOIC-14), making them mechanically and electrically interchangeable. However, LM2901DT uses TSSOP-14 packaging with different pad layout and thermal characteristics - not pin-compatible without PCB redesign.
LM139DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- Open-Collector, Open-Drain
- Voltage - Supply, Single/Dual (±):
- 2V ~ 30V, ±1V ~ 15V
- :
- 5mV @ 30V
- Voltage - Input Offset (Max):
- 0.1µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 2mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
LM139DG4 FAQ
1.How can I place an order for LM139DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139DG4 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 LM139DG4 reliable?
The price and inventory of LM139DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139DG4 is usually 5 days.
3.What payment methods are accepted for LM139DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139DG4?
LM139DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139DG4 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 LM139DG4?
For technical support, including LM139DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139DG4 requirements.
6.How does Aetrix verify that LM139DG4 is sourced from the original manufacturer or authorized distributors?
All LM139DG4 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 LM139DG4 meets industry standards.
7.What is the process for return or replacement of LM139DG4?
All LM139DG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM139DG4, 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 LM139DG4 part is unused and in its original packaging.
Return procedure for LM139DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM139DG4 Tags
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LM339DR
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LM2901PWR
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LM2903P
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