Texas Instruments LM139WB

Overview

LM139WB from Texas Instruments is a quad differential voltage comparator IC designed for single- or dual-supply operation across 2 V to 36 V (tested to 30 V), featuring open-collector outputs compatible with TTL/MOS/CMOS, low input bias current (25 nA typ), low input offset voltage (2 mV typ), and operation over –55°C to +125°C for military-grade reliability in power supervision and industrial control systems.

For engineers reviewing the LM139WB datasheet, LM139WB pinout, LM139WB application, or LM139WB equivalent, key selection considerations include its wide supply range, ground-sensing common-mode input, ±36 V differential input capability, open-drain output architecture enabling wired-AND logic, and MIL-PRF-38535 compliance for high-reliability deployments.

Technical Context

The LM139WB implements four independent comparators with PNP Darlington-pair inputs, enabling high gain and low input bias current while limiting common-mode range to 0 V to (V_CC – 1.5 V) at 25°C (0 V to V_CC – 2 V over full temperature). Its open-collector NPN output stage sinks current when IN– exceeds IN+, producing a logic-low state with resistive saturation voltage scaling linearly with sink current.

Supply current remains constant at 0.8 mA (typ) across the full 2 V–36 V supply range, and response time is overdrive-dependent-1.3 µs typical for 100-mV overdrive with 5.1-kΩ pullup and 15-pF load-making it suitable for precision threshold detection and oscillator timing where supply stability and input accuracy are critical.

Key Specifications

Pinout & Package

LM139WB uses a 14-pin Ceramic Flatpack (CFP) package measuring 9.20 mm × 6.29 mm, hermetically sealed per MIL-STD-1835, with glass-frit lid bonding and optional index marking for pin 1 identification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339DR and LM2901PT, the LM139WB provides guaranteed operation across –55°C to +125°C with 100% parametric test coverage per MIL-PRF-38535, making it the sole option for deployed military, aerospace, and safety-critical infrastructure where component-level traceability and burn-in validation are mandatory.

Availability

LM139WB is available at Aetrix Electronics and suitable for power supervision, automotive body control modules, and industrial sensor interface applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LM139WB 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 precision analog ICs and military-grade components.

The LM139WB belongs to TI's MIL-PRF-38535-compliant comparator family, engineered for high-reliability applications in defense, aerospace, and critical infrastructure where extended temperature operation, hermetic packaging, and full parametric screening are essential.

FAQ

What is the maximum supply voltage rating for LM139WB?

The LM139WB has an absolute maximum supply voltage rating of 36 V for single-supply operation and ±18 V for dual-supply operation, with production testing performed up to 30 V and ±15 V respectively. Exceeding these limits may cause permanent damage, and operation above 30 V is not characterized or guaranteed per the datasheet.

Does LM139WB support ground-referenced input signals?

Yes, the LM139WB supports ground-referenced input signals because its common-mode input voltage range explicitly includes 0 V (ground) across the full operating temperature range, extending up to V_CC – 2 V at extremes - enabling direct connection of sensors such as current-shunt amplifiers or thermocouples without level-shifting circuitry.

What package type is used for LM139WB and what are its key mechanical features?

The LM139WB uses a 14-pin Ceramic Flatpack (CFP) package (body size 9.20 mm × 6.29 mm), hermetically sealed with a ceramic lid bonded via glass frit per MIL-STD-1835. It features a 5.08-mm maximum height, optional pin-1 index marking, and is qualified for high-reliability applications requiring moisture resistance and thermal stability.

Can LM139WB outputs be wired together for logical AND functionality?

Yes, LM139WB outputs can be wired together for wired-AND logic because all four outputs are open-collector NPN structures. When multiple outputs share a common pullup resistor, the combined node goes low if any comparator asserts - enabling simple alarm-bus architectures or multi-threshold voting without external logic gates.

Is LM139WB compliant with MIL-PRF-38535, and what does that mean for its testing?

Yes, LM139WB is compliant with MIL-PRF-38535, meaning it undergoes 100% parametric testing across the full –55°C to +125°C temperature range, including electrical characterization, environmental stress screening, and lot acceptance testing - ensuring guaranteed performance and traceability for mission-critical defense and aerospace deployments.