Texas Instruments LM119 MDR

Overview

LM119 MDR from Texas Instruments is a radiation-hardened, high-speed dual comparator IC designed for space and defense applications requiring operation across −55°C to +125°C. It features two independent comparators, 80 ns typical response time at ±15 V, ≤1 µA input bias current, uncommitted open-collector outputs capable of 25 mA sink, and compatibility with TTL/DTL/RTL logic families.

For engineers reviewing the LM119 MDR datasheet, LM119 MDR pinout, LM119 MDR application, or LM119 MDR equivalent, this page delivers verified radiation-tolerant comparator specifications, dual-channel timing behavior, single- or dual-supply operation (5 V to ±15 V), and design-critical isolation between inputs/outputs and system ground - essential for satellite power sequencing, missile guidance analog monitoring, and nuclear instrumentation signal conditioning.

Technical Context

The LM119 MDR implements two fully independent voltage comparators on a monolithic die, each with differential inputs, high-gain internal amplification (≥5 kV/V), and open-collector NPN output stages. Its architecture supports wide common-mode input range (±12 V at ±15 V supply) and high slew rate, enabling fast edge detection in noisy environments.

Unlike standard commercial comparators, the LM119 MDR is qualified per MIL-STD-883 with radiation assurance: High Dose Rate (100 krad(Si)) and ELDRS-Free performance validated. Input offset voltage remains within ±4.0 mV post-irradiation, and output saturation voltage stays ≤0.6 V at 3.5 V/−1 V supply with 3.2 mA load - critical for precision thresholding under radiation stress.

Key Specifications

Pinout & Package

Diesale (bare die) package - no leadframe or molded body; intended for hybrid microcircuit assembly or chip-on-board integration. Requires custom bonding and hermetic packaging per application requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-speed comparator applications.

Compared with LM119 MDR, LM119J-QMLV offers plug-and-play PCB integration at the cost of larger footprint and lower packaging density, while LM119HRLQMLV trades miniaturization for superior mechanical stability and hermeticity - making LM119 MDR optimal for space-constrained hybrid circuits where die-level customization is feasible.

Availability

LM119 MDR is available at Aetrix Electronics and suitable for satellite telemetry systems, missile guidance electronics, and nuclear instrumentation requiring stable component supply across extended product lifecycles and radiation-hardened assurance.

Supply support for LM119 MDR 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 deep heritage in high-reliability aerospace and defense components.

The LM119QML product line was developed specifically for radiation-intensive applications including spacecraft, strategic weapons, and nuclear facility instrumentation - emphasizing parametric stability, long-term reliability, and compliance with MIL-STD-883 test protocols.

FAQ

What is the operating temperature range for the LM119 MDR?

The LM119 MDR is specified for operation from −55°C to +125°C ambient temperature. This range is fully qualified per MIL-STD-883, with electrical parameters tested at extremes and validated for use in avionics bays, launch vehicle electronics, and downhole oilfield tools where thermal cycling is severe. The LM119 MDR maintains its 80 ns response time and ≤1 µA input bias current across this full range.

Does the LM119 MDR require external pull-up resistors on its outputs?

Yes, the LM119 MDR features uncommitted open-collector outputs that require external pull-up resistors to define the logic-high state. Typical values range from 1 kΩ to 10 kΩ depending on rise time and load requirements. The LM119 MDR can sink up to 25 mA per output, allowing direct interface with TTL, DTL, or relay coils without additional drivers.

How does the LM119 MDR differ from commercial-grade LM119 variants?

The LM119 MDR is a diesale radiation-hardened variant qualified to 100 krad(Si) high-dose-rate and ELDRS-Free standards per MIL-STD-883. Unlike commercial LM119 parts, it undergoes full Group A/B testing, has guaranteed post-irradiation performance (e.g., ±4.0 mV VIO), and is screened for space and defense use. Commercial versions lack radiation data, extended temperature validation, and military-grade screening.

Can the LM119 MDR operate from a single 5 V supply?

Yes, the LM119 MDR is explicitly designed for single 5 V operation as well as dual ±15 V supplies. At 5 V, it delivers ≤0.6 V output saturation voltage with 3.2 mA load and maintains input common-mode range from 1.0 V to 3.0 V. This makes the LM119 MDR suitable for modern low-voltage systems interfacing with microcontrollers or FPGAs while retaining radiation tolerance.

What package type is the LM119 MDR supplied in?

The LM119 MDR is supplied as a diesale (bare die) in JEDEC-standard trays of 32 units. It has no leads or encapsulation - intended for hybrid microcircuit assembly, chip-on-board integration, or custom ceramic packaging. No leadframe, molding compound, or solderable terminations are included; users must implement wire bonding or flip-chip interconnect per their assembly process.