Texas Instruments LM101ALB

Overview

LM101ALB from Texas Instruments (formerly National Semiconductor) is a radiation-hardened, general-purpose operational amplifier designed for high-reliability analog signal conditioning in aerospace and defense systems. It delivers 3 mV max input offset voltage, 100 nA max input bias current over temperature, and 0.3 V/µs min slew rate under QML conditions. Its metal-can H08C package supports operation from −55°C to +125°C and is used in precision integrators, sample-and-hold circuits, and low-frequency waveform generators.

For engineers reviewing the LM101ALB datasheet, LM101ALB pinout, LM101ALB application, or LM101ALB equivalent, key selection considerations include its guaranteed offset drift (±15 µV/°C), radiation-tolerant performance up to 50 krad(Si), and external compensation flexibility enabling stable operation with capacitive loads or high-impedance feedback networks.

Technical Context

The LM101ALB implements a classic bipolar input stage with externally compensated dominant-pole architecture, allowing tailored frequency response via a single 30 pF capacitor. Its input stage uses advanced processing to reduce input current by an order of magnitude versus LM709-class amplifiers, while redesigned biasing minimizes temperature drift of input current.

It features overload protection on both input and output, latch-up immunity when common-mode range is exceeded, and guaranteed stability without oscillation across supply voltages from ±5 V to ±35 V. The device supports feedforward compensation for high-speed AC/DC conversion and offers adjustable offset voltage via dedicated pins.

Key Specifications

Pinout & Package

LM101ALB is supplied in an 8-lead hermetically sealed metal can package (NS Package Number H08C), with Pin 4 internally connected to the case for shielding and thermal conduction. The package meets MIL-STD-883 requirements for mechanical robustness and environmental sealing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar operational amplifier applications.

Compared with LM101ALB, LM101AH/883 offers identical form-factor and baseline performance but omits radiation assurance and extended temperature validation, while OP177GPZ trades environmental robustness for superior DC accuracy - making LM101ALB the sole choice for TID-hardened, wide-temperature analog signal paths.

Availability

LM101ALB is available at Aetrix Electronics and suitable for aerospace telemetry, radiation-hardened power monitoring, and satellite payload signal conditioning requiring stable component supply across extended product lifecycles.

Supply support for LM101ALB 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 acquired National Semiconductor in 2011 and maintains its high-reliability analog portfolio, including radiation-hardened op amps, for defense and space markets.

The LM101A family was originally developed by National Semiconductor to replace LM709 in mission-critical analog signal chains where input current, offset drift, and latch-up immunity were limiting factors in harsh environments.

FAQ

What is the radiation tolerance specification for LM101ALB?

The LM101ALB is qualified to 50 krad(Si) total ionizing dose per MIL-STD-883 Method 1019, with pre- and post-irradiation electrical parameters matching QML-V specifications. This rating applies specifically to the LM101ALB variant and is verified through lot acceptance testing - not inferred from other LM101A versions. LM101ALB maintains guaranteed offset voltage, bias current, and gain performance after exposure.

Does LM101ALB require external compensation, and what capacitor value is recommended?

Yes, LM101ALB requires external frequency compensation via a capacitor between Pin 1 (inverting input) and Pin 6 (output). A 30 pF capacitor is the minimum stable value for source resistances <10 kΩ and stray capacitance <5 pF. For high-impedance feedback networks or capacitive loads >100 pF, larger values (e.g., 100–220 pF) are used to ensure phase margin >60°, as documented in TI's LM101AQML datasheet Figure 20122308.

What is the function of Pin 4 on the LM101ALB metal-can package?

Pin 4 on the LM101ALB is internally connected to the metal can case and serves as a shielded ground reference point. It must be connected to system chassis or analog ground to provide electromagnetic interference (EMI) suppression and thermal conduction. Unlike plastic-packaged op amps, this pin is not electrically isolated - floating Pin 4 degrades CMRR and increases susceptibility to radiated noise.

Can LM101ALB operate with asymmetric supply voltages such as +15 V and −5 V?

Yes, LM101ALB supports asymmetric supplies, including +15 V/−5 V, as confirmed in its QML electrical characteristics table (VCC = +35 V/−5 V and +5 V/−35 V test conditions). Input common-mode range extends to ±15 V regardless of supply asymmetry, and PSRR remains ≥80 dB. However, output swing is constrained by the smaller rail - e.g., with +15 V/−5 V, maximum negative output is limited to ~−3.5 V due to saturation limits.

How does LM101ALB differ from standard LM101A variants like LM101AH/883?

LM101ALB is a QML-V qualified variant with radiation hardness (50 krad(Si)), extended temperature validation (−55°C to +125°C), and enhanced screening per MIL-PRF-38535. While LM101AH/883 shares the same H08C package and baseline specs, it lacks radiation testing, has narrower temperature limits (−55°C to +125°C not fully guaranteed), and is Class B rather than Class V. LM101ALB also includes tighter drift guarantees (±15 µV/°C) and lower input bias current (0.1 nA typ) under irradiated conditions.