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Home > Products > Integrated Circuits (ICs) > Linear > Comparators

Texas Instruments LM139JB

Name: LM139JB
Brand: Texas Instruments
SKU: LM139JB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM139JB

Manufacturer:: Texas Instruments

Category:: Comparators

Package:: 14-CDIP (0.300", 7.62mm)

Datasheet:: LM139JB.pdf

Description:: QUAD DIFFERENTIAL COMPARATOR 14-

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Product details

Overview

LM139JB from Texas Instruments is a quad differential voltage comparator designed for military-grade operation across –55°C to +125°C, featuring open-collector outputs, 2 V to 36 V single-supply capability, 2 mV typical input offset voltage, and compatibility with TTL/MOS/CMOS logic - used in power supervision, oscillator circuits, and level translation in harsh-environment automotive body control modules.

For engineers reviewing the LM139JB datasheet, LM139JB pinout, LM139JB application, or LM139JB equivalent, this page delivers verified electrical parameters, military-qualified thermal and ESD performance (±500 V HBM), exact CDIP-14 pin mapping, and validated alternatives for high-reliability analog signal conditioning designs.

Technical Context

The LM139JB implements four independent PNP Darlington-pair input stages enabling rail-to-rail common-mode input range down to ground and up to VCC – 1.5 V at 25°C (VCC – 2 V over full temperature range), with low input bias current (25 nA typ) and low offset current (3 nA typ). Its open-collector NPN output stage supports wired-AND logic and flexible pull-up voltage selection.

It operates with supply-independent quiescent current (0.8 mA typ for all four comparators), withstands ±36 V differential input voltage, and delivers 1.3 µs typical response time with 100-mV overdrive under 5-V supply - validated per MIL-PRF-38535 with 100% parameter testing.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Range	Single: 2 V to 36 V (tested to 30 V); dual: ±1 V to ±18 V (tested to ±15 V) - enables direct interface with 3.3 V, 5 V, 12 V, and 24 V industrial rails without level-shifting.
Input Offset Voltage	2 mV typical (9 mV max over –55°C to +125°C) - ensures accurate threshold detection in precision voltage monitoring applications.
Input Bias Current	25 nA typical (–300 nA max over temp) - minimizes loading on high-impedance sensor sources like thermistors or photodiodes.
Output Configuration	Open-collector NPN - allows wired-AND logic, programmable logic-low voltage via external pull-up, and interfacing with mixed-voltage systems.
Response Time	1.3 µs typical (5-mV overdrive, 5-V supply, 15-pF load) - supports kHz-range oscillator and pulse-width modulation feedback loops.
Operating Temperature	–55°C to +125°C - qualified for engine bay, avionics, and defense electronics where extended thermal stability is mandatory.
ESD Rating	±500 V HBM, ±750 V CDM - meets MIL-STD-883 requirements for robust handling in production and field environments.

Pinout & Package

LM139JB is supplied in a hermetically sealed ceramic dual in-line package (CDIP-14), measuring 21.30 mm × 7.60 mm, with 0.100-inch lead pitch and glass-frit lid seal compliant with MIL-STD-1835 and GDIP1-T14.

Pin/Terminal	Circuit Role	Design Meaning
1	1OUT	Open-collector output of comparator 1 - sinks current when IN– > IN+ + VIO; requires external pull-up for logic-high state.
2	2OUT	Open-collector output of comparator 2 - electrically isolated from other outputs; enables independent logic-level translation per channel.
3	VCC	Positive supply pin - accepts 2 V to 36 V; all comparators share this rail; no separate ground reference required for single-supply operation.
4	2IN−	Inverting input of comparator 2 - differential pair input referenced to internal Darlington stage; supports common-mode range to ground.
5	2IN+	Non-inverting input of comparator 2 - matched input impedance to 2IN−; used for reference comparison or signal sensing.
6	1IN−	Inverting input of comparator 1 - identical electrical characteristics to other inputs; validated for –55°C to +125°C operation.
7	1IN+	Non-inverting input of comparator 1 - supports DC-coupled inputs; input voltage must stay within 0 V to VCC – 1.5 V at 25°C.
8	GND	Ground reference - serves as return path for all four comparators and output sink currents; no separate analog/digital ground required.
9	3IN+	Non-inverting input of comparator 3 - pin-compatible with all other IN+ pins; enables multi-threshold detection in safety-critical monitoring.
10	3IN−	Inverting input of comparator 3 - supports differential input configurations; tolerant of input voltages up to 30 V without damage.
11	4IN+	Non-inverting input of comparator 4 - fully decoupled from other channels; usable for redundant or cross-checked comparisons.
12	4IN−	Inverting input of comparator 4 - maintains same offset and bias specs as other inputs; validated under MIL-PRF-38535 screening.
13	4OUT	Open-collector output of comparator 4 - supports independent load switching; compatible with 3.3 V, 5 V, and 12 V logic families.
14	3OUT	Open-collector output of comparator 3 - shares same VOL spec (150–400 mV at 4 mA) as other outputs; enables parallel sinking if needed.

Key Features

Feature	Design Value
Wide supply range	Operates from 2 V to 36 V single supply - eliminates need for auxiliary regulators in 12 V/24 V automotive or industrial power rails.
Ground-sensing input	Common-mode input range includes 0 V - enables direct monitoring of battery voltage, sensor outputs, or ground-referenced signals.
Low power consumption	0.8 mA typical supply current for all four comparators - reduces thermal load and extends battery life in always-on supervisory circuits.
MIL-qualified testing	All parameters tested per MIL-PRF-38535 - guarantees performance consistency across temperature, radiation, and reliability stress tests.
Robust input protection	Withstands ±36 V differential input and 30 V absolute input voltage - prevents latch-up or damage during transients or miswiring.

Applications

Power Supervision	Oscillators
Use Scenario: Monitoring 12 V vehicle battery voltage against 11.5 V and 13.8 V thresholds to trigger low-voltage warning and overvoltage shutdown. IC Role / Device Role / Timing Role: Quad comparator performing independent high/low window detection with hysteresis added externally. Use Value: Enables fail-safe power management using only one LM139JB instead of four discrete comparators - reducing BOM count and PCB area.	Use Scenario: Generating square-wave clock signals in relaxation oscillators using RC timing networks and internal hysteresis. IC Role / Device Role / Timing Role: Comparator acting as threshold detector with feedback to control charge/discharge cycles of timing capacitor. Use Value: Achieves stable 1–100 kHz frequency generation without external op-amps or timers - simplifying oscillator design in space-constrained modules.
Peak Detectors	Logic Voltage Translation
Use Scenario: Capturing and holding maximum amplitude of analog sensor signals (e.g., pressure transducer bursts) for ADC sampling. IC Role / Device Role / Timing Role: Comparator driving MOSFET gate to charge storage capacitor when input exceeds held peak value. Use Value: Provides sub-µs response to fast-rising peaks while maintaining <10 µV/s droop - critical for transient event capture in test equipment.	Use Scenario: Converting 3.3 V microcontroller GPIO outputs to 12 V logic levels for driving relays or solenoids in automotive ECUs. IC Role / Device Role / Timing Role: Level shifter using open-collector output pulled to 12 V, with 3.3 V input controlling sink state. Use Value: Eliminates need for dedicated level translators or discrete transistor buffers - lowering component cost and layout complexity.

Power Supervision

Oscillators

Use Scenario: Monitoring 12 V vehicle battery voltage against 11.5 V and 13.8 V thresholds to trigger low-voltage warning and overvoltage shutdown.

IC Role / Device Role / Timing Role: Quad comparator performing independent high/low window detection with hysteresis added externally.

Use Value: Enables fail-safe power management using only one LM139JB instead of four discrete comparators - reducing BOM count and PCB area.

Use Scenario: Generating square-wave clock signals in relaxation oscillators using RC timing networks and internal hysteresis.

IC Role / Device Role / Timing Role: Comparator acting as threshold detector with feedback to control charge/discharge cycles of timing capacitor.

Use Value: Achieves stable 1–100 kHz frequency generation without external op-amps or timers - simplifying oscillator design in space-constrained modules.

Peak Detectors

Logic Voltage Translation

Use Scenario: Capturing and holding maximum amplitude of analog sensor signals (e.g., pressure transducer bursts) for ADC sampling.

IC Role / Device Role / Timing Role: Comparator driving MOSFET gate to charge storage capacitor when input exceeds held peak value.

Use Value: Provides sub-µs response to fast-rising peaks while maintaining <10 µV/s droop - critical for transient event capture in test equipment.

Use Scenario: Converting 3.3 V microcontroller GPIO outputs to 12 V logic levels for driving relays or solenoids in automotive ECUs.

IC Role / Device Role / Timing Role: Level shifter using open-collector output pulled to 12 V, with 3.3 V input controlling sink state.

Use Value: Eliminates need for dedicated level translators or discrete transistor buffers - lowering component cost and layout complexity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad comparator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM339J	Commercial-grade (0°C to +70°C), same pinout and basic specs but untested per MIL-PRF-38535; higher max input offset (7 mV).	Lacks extended temperature validation and 100% parametric testing - unsuitable for under-hood or aerospace use.	Select LM339J only for cost-sensitive, non-military commercial designs operating within 0°C–70°C ambient.
LM2901J	Industry-temp version (–40°C to +125°C), same CDIP-14 package, but not MIL-qualified; input offset voltage spec looser (7 mV max).	Validated for automotive under-hood but lacks radiation tolerance, hermetic sealing, and full MIL screening.	Choose LM2901J for AEC-Q100-compliant automotive applications where MIL-PRF-38535 compliance is not mandated.

Compared with LM139JB, LM339J offers lower cost but no military qualification or extended temperature assurance, while LM2901J provides broader industrial temperature coverage than commercial parts yet omits hermetic packaging and MIL test rigor - making LM139JB the sole choice for mission-critical defense and space-qualified systems.

Availability

LM139JB is available at Aetrix Electronics and suitable for power supervision, oscillator design, and logic voltage translation requiring stable component supply in defense electronics, aerospace subsystems, and high-reliability industrial controls.

Supply support for LM139JB 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, with over 90 years of innovation in high-reliability components for aerospace, defense, and industrial markets.

The LM139JB belongs to TI's military-grade comparator product line, engineered specifically for extreme-temperature operation, hermetic reliability, and full MIL-PRF-38535 compliance in safety-critical analog signal conditioning.

FAQ

What is the maximum supply voltage rating for LM139JB?

The LM139JB supports an absolute maximum supply voltage of 36 V on the VCC pin, with production-tested operation up to 30 V per the datasheet. This rating applies to both single-supply (2 V to 36 V) and dual-supply (±1 V to ±18 V) configurations, and is validated across the full –55°C to +125°C operating range. Exceeding 36 V risks permanent device damage.

Does LM139JB require dual supplies to operate?

No, LM139JB operates fully from a single supply ranging from 2 V to 36 V. Dual supplies are optional and supported only if the difference between rails is 2 V to 36 V and the positive rail (VCC) remains at least 1.5 V above the input common-mode voltage. Single-supply operation is standard and widely used in automotive and industrial applications.

What does "open-collector output" mean for LM139JB?

Each of the four outputs in LM139JB is an open-collector NPN transistor that can only sink current to ground. To achieve a logic-high state, an external pull-up resistor must connect the output to a chosen voltage rail (e.g., 3.3 V, 5 V, or 12 V). This architecture enables wired-AND logic, mixed-voltage interfacing, and programmable output voltage levels - a key feature confirmed in the LM139JB datasheet.

Is LM139JB pin-compatible with LM339 or LM2901?

Yes, LM139JB shares identical CDIP-14 pinout and terminal functions with LM339J and LM2901J, including 1IN+, 1IN−, 1OUT, GND, VCC, and all remaining comparator I/Os. However, LM139JB differs in qualification level, temperature range, and test coverage - it is not a drop-in replacement unless MIL-PRF-38535 compliance and –55°C to +125°C operation are required.

What is the input common-mode voltage range of LM139JB?

The LM139JB input common-mode voltage range spans from ground (0 V) to VCC – 1.5 V at 25°C, and from 0 V to VCC – 2 V across the full –55°C to +125°C operating range. This specification is explicitly defined in the Electrical Characteristics table and enables direct sensing of signals referenced to system ground - a core capability confirmed in the LM139JB datasheet.

LM139JB 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

:: 5mV @ 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

LM139JB FAQ

1.How can I place an order for LM139JB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM139JB 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 LM139JB reliable?

The price and inventory of LM139JB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139JB is usually 5 days.

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Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM139JB?

LM139JB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM139JB 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 LM139JB?

For technical support, including LM139JB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139JB requirements.

6.How does Aetrix verify that LM139JB is sourced from the original manufacturer or authorized distributors?

All LM139JB 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 LM139JB meets industry standards.

7.What is the process for return or replacement of LM139JB?

All LM139JB units undergo pre-shipment inspection (PSI). If there is an issue with LM139JB, 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 LM139JB part is unused and in its original packaging.

Return procedure for LM139JB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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