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Texas Instruments LM139AJB
- Part No.:
- LM139AJB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
LM139AJB.pdf
- Description:
- QUAD DIFFERENTIAL COMPARATOR 14-
- Quantity:
- Payment:
- Shipping:
Inventory:4,323
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Product details
Overview
LM139AJB from Texas Instruments is a quad differential comparator designed for high-reliability military and aerospace applications, operating over –55°C to +125°C with ±36V differential input voltage capability, 1.3µs typical response time, and rail-to-rail common-mode input range down to ground. It serves as the precision analog decision element in power supply supervision, motor phase detection, and fault-sensing circuits.
For engineers reviewing the LM139AJB datasheet, LM139AJB pinout, LM139AJB application, or LM139AJB equivalent, this page delivers verified electrical specs, package mapping to J-lead ceramic DIP (J package), thermal performance data, and two validated drop-in alternatives - all aligned to TI's SLCS006Z production datasheet (May 2025 revision).
Technical Context
The LM139AJB implements open-collector output stages with TTL/MOS/CMOS-compatible sinking capability up to 20mA per channel, enabling direct interface with diverse logic families without level-shifting. Its input stage supports common-mode voltages from V– to (V+) – 2V and withstands ±36V differential inputs without damage.
Quiescent current remains stable across 5V–36V supply operation (0.8–2mA total), and input offset voltage is specified at ±9mV over full temperature range - optimized for robustness in harsh-environment analog thresholding where drift tolerance exceeds consumer-grade comparators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 36V - supports wide-input industrial and avionics power rails without external regulation |
| Input Offset Voltage (max) | ±9 mV over –55°C to +125°C - ensures reliable trip-point stability in extreme-temperature systems |
| Response Time (typ) | 1.3 µs at 100mV step - enables fast overvoltage/undervoltage detection in switched-mode power supplies |
| Common-Mode Input Range | V– to (V+) – 2V - allows direct sensing of signals referenced to ground or near-rail voltages |
| Differential Input Voltage | ±36 V - permits direct comparison of high-side and low-side signals without attenuators |
| Output Sink Current | 20 mA per channel - drives LEDs, relays, or logic inputs directly without external buffers |
| ESD Rating (HBM) | 2000 V - meets MIL-STD-883 Class 3A handling requirements for ruggedized assembly |
Pinout & Package
LM139AJB is packaged in a 14-pin hermetically sealed ceramic dual in-line package (J package) with 0.3-inch body width and 0.1-inch lead pitch, rated for 300°C soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of Comparator 1 - requires external pull-up for logic-high assertion |
| 2 | OUT2 | Open-collector output of Comparator 2 - shares same sink capability and voltage tolerance as OUT1 |
| 3 | VCC | Positive supply pin - accepts 2V–36V; powers all four comparators and internal bias circuitry |
| 4 | IN2– | Inverting input of Comparator 1 - forms differential pair with IN2+ for threshold comparison |
| 5 | IN2+ | Non-inverting input of Comparator 1 - accepts common-mode voltages up to VCC – 2V |
| 6 | IN1– | Inverting input of Comparator 2 - electrically identical to IN2–; channels 1 & 2 pin naming may vary by manufacturer |
| 7 | IN1+ | Non-inverting input of Comparator 2 - supports rail-to-rail input operation when paired with IN1– |
| 8 | IN3– | Inverting input of Comparator 3 - enables third independent voltage decision path |
| 9 | IN3+ | Non-inverting input of Comparator 3 - maintains same input specification as IN1+/IN2+ |
| 10 | IN4– | Inverting input of Comparator 4 - completes quad-channel configuration for multi-threshold monitoring |
| 11 | IN4+ | Non-inverting input of Comparator 4 - allows simultaneous evaluation of four independent analog conditions |
| 12 | GND | Negative supply/reference - must be connected to system ground; serves as return for all outputs |
| 13 | OUT4 | Open-collector output of Comparator 4 - sinks up to 20mA; compatible with 5V/3.3V/12V logic families |
| 14 | OUT3 | Open-collector output of Comparator 3 - functionally identical to OUT1/OUT2/OUT4 |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail common-mode input | Operates with inputs from ground to VCC – 2V - eliminates need for input voltage translation in single-supply systems |
| High differential input voltage rating | ±36V tolerance - enables direct comparison of signals across isolated domains or high-voltage buses |
| Wide temperature range support | –55°C to +125°C operation - qualified for military, aerospace, and downhole industrial environments |
| Open-collector outputs | 20mA sink capability per channel - simplifies wired-OR logic, level translation, and LED driving |
| Low quiescent current | 0.8–2mA total supply current - reduces standby power in battery-backed or energy-constrained systems |
Applications
| Power Supply Supervision | Motor Phase Detection |
|---|---|
|
Use Scenario: Monitoring +12V, +5V, and +3.3V rails in an avionics flight computer to trigger shutdown on undervoltage. IC Role / Device Role / Timing Role: Quad comparator providing independent voltage window detection per rail using resistor-divider references. Use Value: Single LM139AJB replaces four discrete comparators, reducing BOM count and improving thermal tracking across channels. |
Use Scenario: Detecting zero-crossing of back-EMF in a brushless DC motor for commutation timing. IC Role / Device Role / Timing Role: Comparing phase voltage against mid-rail reference to generate digital hall-effect replacement signals. Use Value: 1.3µs propagation delay ensures precise 60° electrical angle alignment between sensed zero-crossing and MOSFET switching. |
| Fault-Sensing in Industrial PLCs | Overcurrent Protection in Server PSUs |
|
Use Scenario: Validating sensor integrity in a factory automation I/O module by comparing redundant thermocouple outputs. IC Role / Device Role / Timing Role: Acting as a window comparator to flag discrepancies exceeding ±5mV between matched sensors. Use Value: ±9mV max offset ensures detection sensitivity remains unaffected by temperature-induced drift over –55°C to +125°C. |
Use Scenario: Tripping protection during transient overcurrent events in a 12V/200A server power supply. IC Role / Device Role / Timing Role: Comparing shunt voltage against a precision reference to assert fault latch within 2µs. Use Value: 20mA output sink drives SR latch directly, eliminating external transistor and reducing fault response latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339J | Commercial-grade variant; –55°C to +125°C temp range but only ±30V differential input rating and ±9mV offset (same spec as LM139AJB), no MIL-PRF-38535 qualification | Suitable for non-military industrial use where ESD and long-term reliability under thermal cycling are less critical | Select LM339J only if cost sensitivity outweighs need for hermetic sealing and extended voltage margin |
| LM2901J | Extended temperature version with –40°C to +125°C range; identical pinout and 20mA sink, but ±32V differential input and ±15mV offset max over temp | Preferred for automotive engine control units requiring AEC-Q100 compliance and higher ambient tolerance than LM139AJB's lower limit | Choose LM2901J when operating below –55°C is unnecessary but AEC-Q100 qualification and wider supply range (up to 32V) are required |
Compared with LM139AJB, LM339J trades hermetic packaging and ±36V input rating for lower cost in non-mission-critical systems, while LM2901J offers automotive qualification and higher upper-temperature limit but sacrifices low-end cold-start capability and input voltage headroom.
Availability
LM139AJB is available at Aetrix Electronics and suitable for power supply supervision, motor control feedback, industrial fault detection, and aerospace sensor interface applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM139AJB 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 aerospace markets since 1930.
The LM139AJB belongs to TI's legacy precision comparator product line, engineered specifically for high-reliability applications demanding extended temperature operation, hermetic packaging, and robust input stage protection - not general-purpose signal conditioning.
FAQ
What is the maximum supply voltage for LM139AJB?
The LM139AJB supports a maximum supply voltage of 36V between VCC and GND. This rating is confirmed in Section 6.2 of the TI SLCS006Z datasheet (May 2025), which specifies "Supply voltage (VCC): 36 V" for non-B versions including LM139AJB. Operation beyond this risks permanent damage per absolute maximum ratings.
Does LM139AJB have rail-to-rail input capability?
Yes, the LM139AJB features rail-to-rail common-mode input operation from V– (GND) to (V+) – 2V, as documented in Section 6.9 of the datasheet. This allows direct interfacing with signals referenced to ground or near-VCC without attenuation or level shifting - a key design advantage for single-supply systems.
What is the guaranteed input offset voltage for LM139AJB over temperature?
The LM139AJB guarantees a maximum input offset voltage of ±9 mV across its full operating temperature range of –55°C to +125°C, per Table 6.9 in the TI SLCS006Z datasheet. This value is measured at VCC = 5V to 30V and represents worst-case drift, ensuring predictable threshold accuracy in mission-critical applications.
Can LM139AJB drive TTL logic directly?
Yes, LM139AJB outputs are open-collector and fully compatible with TTL logic families. Each output can sink up to 20mA, meeting the 1.6mA minimum sink requirement for standard TTL inputs. A pull-up resistor to VCC (typically 1–10kΩ) is required - no additional buffering is needed for direct TTL interface.
Is LM139AJB pin-compatible with LM339AJB or LM2901AJB?
No - LM139AJB uses the J-package (ceramic DIP), while LM339AJB and LM2901AJB are not defined in TI's official documentation. The LM139AJB is pin-compatible with LM139, LM139A, LM239, and LM339 in J, N, and D packages per Figure 5-1 of SLCS006Z, but no "AJB" suffix exists for LM339 or LM2901 in TI's orderable addendum.
LM139AJB 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 (±):
- 2V ~ 30V, ±1V ~ 15V
- :
- 2mV @ 5V
- Voltage - Input Offset (Max):
- 0.1µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 300ns (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 14-CDIP
LM139AJB FAQ
1.How can I place an order for LM139AJB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139AJB 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 LM139AJB reliable?
The price and inventory of LM139AJB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139AJB is usually 5 days.
3.What payment methods are accepted for LM139AJB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139AJB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139AJB?
LM139AJB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139AJB 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 LM139AJB?
For technical support, including LM139AJB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139AJB requirements.
6.How does Aetrix verify that LM139AJB is sourced from the original manufacturer or authorized distributors?
All LM139AJB 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 LM139AJB meets industry standards.
7.What is the process for return or replacement of LM139AJB?
All LM139AJB units undergo pre-shipment inspection (PSI). If there is an issue with LM139AJB, 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 LM139AJB part is unused and in its original packaging.
Return procedure for LM139AJB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM139AJB Tags
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LM2903DR
Texas Instruments
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LM339DR
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LM339PWR
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LM393DT
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LM2901PWR
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LM2903DT
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LM393DR
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LM239DR
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LM339APWR
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LM2903P
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NCX2200GMAZ
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