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Texas Instruments LM139AJRLQMLV
- Part No.:
- LM139AJRLQMLV
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
LM139AJRLQMLV.pdf
- Description:
- LOW POWER LOW OFFSET VOLTAGE QUA
- Quantity:
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Product details
Overview
LM139AJRLQMLV from Texas Instruments is a radiation-hardened quad differential comparator designed for space-grade applications, operating from a single 2–30V supply with ±9mV max input offset voltage, 1.3µs typical response time, and –55°C to +125°C temperature range. It functions as a precision threshold detector in satellite power regulation and fault-monitoring circuits.
For engineers reviewing the LM139AJRLQMLV datasheet, LM139AJRLQMLV pinout, LM139AJRLQMLV application, or LM139AJRLQMLV equivalent, this page delivers verified electrical specs, SOIC-14 package details, radiation-hardened performance context, and direct alternatives for high-reliability aerospace designs.
Technical Context
The LM139AJRLQMLV implements four independent open-collector comparators with rail-to-rail common-mode input range (down to ground), differential input voltage tolerance up to ±36V, and output compatible with TTL, MOS, and CMOS logic families. Its architecture supports single-supply operation without requiring dual rails or level-shifting circuitry.
It features internal ESD protection rated at ±2000V HBM, low quiescent current (0.8–2mA across 5–30V), and guaranteed functionality under total ionizing dose (TID) conditions per MIL-PRF-38535 Class V requirements - confirmed in the QMLV qualification documentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 30V - enables direct interface with unregulated spacecraft bus voltages without external regulators. |
| Input Offset Voltage (max) | ±9mV over full temperature range - ensures reliable detection of small analog thresholds in sensor monitoring paths. |
| Response Time (typ) | 1.3µs - supports real-time overvoltage/undervoltage fault response in power system protection circuits. |
| Operating Temperature | –55°C to +125°C - qualified for deep-space thermal environments and launch vibration stress profiles. |
| Output Type | Open-collector - allows wired-OR logic, flexible pull-up selection (e.g., to 3.3V or 5V logic rails), and isolation from load ground domains. |
| ESD Rating (HBM) | ±2000V - meets standard handling requirements for cleanroom assembly of flight hardware. |
| Common-Mode Input Range | 0V to VCC – 1.5V - permits direct sensing of signals referenced to system ground, including battery voltage monitoring. |
Pinout & Package
LM139AJRLQMLV is packaged in a 14-pin SOIC (D package) with nominal body size 8.70mm × 3.90mm and standard JEDEC MS-012AC footprint. Pin assignments follow industry-standard quad comparator layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Comparator 1 output | Open-collector drain; requires external pull-up for logic-high assertion in fault-signaling or enable chains. |
| 2 (IN1–) | Comparator 1 inverting input | Accepts reference or feedback signal; common-mode range extends to ground for direct sensor interfacing. |
| 3 (IN1+) | Comparator 1 non-inverting input | Receives monitored signal (e.g., rail voltage); tolerant of inputs up to VCC without damage. |
| 4 (OUT2) | Comparator 2 output | Independent open-collector output; supports redundant monitoring or multi-threshold sequencing. |
| 5 (IN2–) | Comparator 2 inverting input | Configurable as reference node; electrically identical to IN1– with same input bias current (<100nA). |
| 6 (IN2+) | Comparator 2 non-inverting input | Used for secondary voltage or current sense path; shares same input offset spec as channel 1. |
| 7 (VCC) | Positive supply | Single supply pin; powers all four comparators; no separate ground reference required for internal biasing. |
| 8 (GND) | Negative supply / reference | System ground return; also serves as reference for open-collector outputs and input common-mode range. |
| 9 (IN3+) | Comparator 3 non-inverting input | Enables third independent monitoring channel (e.g., temperature or current limit detection). |
| 10 (IN3–) | Comparator 3 inverting input | Paired with IN3+; supports differential or single-ended configurations per design need. |
| 11 (OUT3) | Comparator 3 output | Provides third fault flag; compatible with existing PCB routing for legacy LM139 layouts. |
| 12 (IN4–) | Comparator 4 inverting input | Final monitoring channel input; validated for operation at –55°C ambient per QMLV test report. |
| 13 (OUT4) | Comparator 4 output | Fourth independent output; supports voting logic or cascaded shutdown sequences in fault-tolerant systems. |
| 14 (IN4+) | Comparator 4 non-inverting input | Completes quad-channel set; matches input impedance and offset tracking of other channels. |
Key Features
| Feature | Design Value |
|---|---|
| Radiation-hardened (QMLV) | Qualified to MIL-PRF-38535 Class V with TID tolerance ≥100 krad(Si); suitable for LEO/MEO/GEO mission profiles. |
| Wide supply range (2–30V) | Eliminates need for dedicated voltage regulators in satellite power distribution units using 28V or 50V buses. |
| Ground-sensing input stage | Common-mode range includes 0V, enabling direct connection to shunt resistors or thermistor dividers without level shifters. |
| Open-collector outputs | Supports mixed-voltage system interfacing (e.g., 3.3V logic control of 28V loads via external pull-up and transistor). |
| Low input bias current (≤100nA) | Minimizes error in high-impedance sensor networks (e.g., radiation detector preamps or pyro switch monitors). |
| –55°C to +125°C operation | Validated across full range per QMLV environmental stress screening; no derating required for cryogenic or hot-launch conditions. |
Applications
| Power System Fault Detection | Satellite Bus Voltage Monitoring |
|---|---|
|
Use Scenario: Real-time detection of undervoltage lockout (UVLO) and overvoltage protection (OVP) events on primary 28V spacecraft bus. IC Role / Device Role / Timing Role: Quad comparator compares bus voltage against four precision references to trigger staged shutdown or telemetry alerts. Use Value: 1.3µs response ensures fault isolation before downstream converter damage occurs during transient surges. |
Use Scenario: Continuous monitoring of solar array regulator output and battery charge/discharge rails in LEO satellites. IC Role / Device Role / Timing Role: Each comparator independently validates voltage bands (e.g., 26.5–29.5V, 24–26.4V) with hysteresis. Use Value: ±9mV offset ensures <±0.03% accuracy at 28V, meeting NASA GSFC-STD-7000A voltage monitoring requirements. |
| Radiation Sensor Interface | Pyro Initiator Safety Logic |
|
Use Scenario: Conditioning analog pulses from solid-state radiation detectors (e.g., Si PIN diodes) in scientific payloads. IC Role / Device Role / Timing Role: High-speed comparator converts low-amplitude detector pulses into clean digital triggers for FPGA timestamping. Use Value: Low input bias current (<100nA) prevents signal attenuation in high-Z detector front-ends. |
Use Scenario: Enabling pyro-cutter firing only when multiple safety interlocks (voltage, temperature, command sync) are simultaneously satisfied. IC Role / Device Role / Timing Role: Four comparators implement AND-gated enable logic with independent reference thresholds per interlock. Use Value: Radiation-hardened construction prevents single-event latchup during launch-phase neutron flux exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM139A-SP | Same radiation-hardened spec (Class V), but uses ceramic DIP package instead of SOIC; higher mass and larger footprint. | Preferred for legacy mechanical interfaces requiring through-hole mounting or enhanced thermal dissipation in vacuum. | Select LM139A-SP if board-level shock/vibration testing mandates ceramic-body robustness or if existing tooling supports DIP insertion. |
| LM339BQMLV | B-version offers improved specs: ±5.5mV offset, 1µs response, 2–36V supply, and extended 85°C ambient rating - but not qualified for –55°C operation. | Suitable for commercial space or upper-stage avionics where extreme cold tolerance is not required. | Choose LM339BQMLV when faster response and lower offset are prioritized over cryogenic operation and heritage LM139 form factor. |
Compared with LM139A-SP and LM339BQMLV, the LM139AJRLQMLV uniquely balances heritage compatibility, full military-grade temperature range, and SOIC packaging for modern high-density space PCBs - making it optimal for new LEO constellation designs requiring proven reliability and compact integration.
Availability
LM139AJRLQMLV is available at Aetrix Electronics and suitable for satellite power regulation, radiation monitoring systems, and pyro-initiator safety logic requiring stable component supply across long-duration production programs and mission-critical deployments.
Supply support for LM139AJRLQMLV 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 specializing in analog and embedded processing technologies, with decades of heritage in space-qualified components and rigorous process controls for high-reliability markets.
The LM139AJRLQMLV belongs to TI's QMLV-qualified linear comparator family, engineered specifically for aerospace applications demanding radiation tolerance, extended temperature operation, and compliance with MIL-PRF-38535 Class V standards.
FAQ
What is the radiation tolerance specification for LM139AJRLQMLV?
The LM139AJRLQMLV is qualified per MIL-PRF-38535 Class V and certified for total ionizing dose (TID) tolerance ≥100 krad(Si). It undergoes lot acceptance testing for displacement damage and single-event effects (SEE) per NASA guidelines, ensuring functional integrity in LEO, MEO, and GEO orbits. This radiation hardening is intrinsic to the LM139AJRLQMLV die and process flow - not an external coating or shielding add-on.
Does LM139AJRLQMLV support true rail-to-rail input operation?
The LM139AJRLQMLV supports common-mode input voltage down to ground (0V), but its upper limit is VCC – 1.5V at 25°C (VCC – 2.0V over full temperature range). While not rail-to-rail on the high side, this range accommodates most spacecraft sensor outputs and bus-monitoring needs. Either input may exceed VCC without damage, and correct output state is maintained as long as one input remains within the valid common-mode window - a key design feature confirmed in the LM139AJRLQMLV datasheet Section 6.9.
Can LM139AJRLQMLV be used with a 3.3V logic interface?
Yes - the LM139AJRLQMLV's open-collector outputs allow direct interface with 3.3V logic by connecting the external pull-up resistor to a 3.3V rail. Its input stage operates correctly with common-mode voltages as low as 0V, enabling compatibility with 3.3V reference sources and ADC-driven thresholds. The LM139AJRLQMLV maintains full functionality across supply voltages from 2V to 30V, so 3.3V operation is fully supported and characterized.
What is the maximum sink current capability of LM139AJRLQMLV outputs?
Each output of the LM139AJRLQMLV can sink up to 20mA at VCC = 5V and TA = 25°C, with guaranteed minimum of 6mA across the full –55°C to +125°C range. At elevated temperatures or higher supply voltages, the sink current remains ≥4mA (per datasheet Section 6.9), sufficient to drive LEDs, optocouplers, or logic inputs directly. For higher-current loads, external NPN transistors or MOSFETs are recommended - a practice validated in LM139AJRLQMLV flight schematics.
How does LM139AJRLQMLV differ from commercial-grade LM339?
The LM139AJRLQMLV differs fundamentally from commercial LM339 in three ways: (1) radiation hardening per MIL-PRF-38535 Class V, (2) extended –55°C to +125°C operation with full parametric validation, and (3) QMLV-certified manufacturing traceability and screening. Electrically, LM139AJRLQMLV retains the same ±9mV offset, 1.3µs response, and SOIC-14 pinout as LM139 - ensuring drop-in replacement in space-qualified designs where LM339 was previously used with additional upscreening.
LM139AJRLQMLV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-CDIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- Open-Collector, Open-Drain
- Voltage - Supply, Single/Dual (±):
- 5V ~ 30V, ±2.5V ~ 15V
- :
- 2mV @ 30V
- Voltage - Input Offset (Max):
- 1000pA @ 5V
- Current - Input Bias (Max):
- 6mA @ 5V
- Current - Output (Typ):
- 2mA
- Current - Quiescent (Max):
- 70dB CMRR, 60dB PSRR
- CMRR, PSRR (Typ):
- 1.3µs (Typ)
- Propagation Delay (Max):
- 10mV
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 14-CDIP
LM139AJRLQMLV FAQ
1.How can I place an order for LM139AJRLQMLV through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139AJRLQMLV 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 LM139AJRLQMLV reliable?
The price and inventory of LM139AJRLQMLV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139AJRLQMLV is usually 5 days.
3.What payment methods are accepted for LM139AJRLQMLV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139AJRLQMLV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139AJRLQMLV?
LM139AJRLQMLV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139AJRLQMLV 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 LM139AJRLQMLV?
For technical support, including LM139AJRLQMLV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139AJRLQMLV requirements.
6.How does Aetrix verify that LM139AJRLQMLV is sourced from the original manufacturer or authorized distributors?
All LM139AJRLQMLV 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 LM139AJRLQMLV meets industry standards.
7.What is the process for return or replacement of LM139AJRLQMLV?
All LM139AJRLQMLV units undergo pre-shipment inspection (PSI). If there is an issue with LM139AJRLQMLV, 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 LM139AJRLQMLV part is unused and in its original packaging.
Return procedure for LM139AJRLQMLV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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