Texas Instruments LF442AMH

Overview

LF442AMH from Texas Instruments is a dual low-power JFET-input operational amplifier in TO-99 metal can package, delivering 1 MHz gain-bandwidth, 1 V/μs slew rate, and 400 μA max supply current across −55°C to +125°C. It features 50 pA max input bias current, 1 mV max input offset voltage, and 10¹² Ω input impedance - enabling precision, low-noise signal conditioning in battery-powered instrumentation and military-grade analog front-ends.

For engineers reviewing the LF442AMH datasheet, LF442AMH pinout, LF442AMH application, or LF442AMH equivalent, key selection criteria include its JFET-input architecture for ultra-low bias current, military temperature range (−55°C to +125°C), TO-99 thermal performance (R_θJA = 165°C/W in static air), and pin compatibility with LM1458 for drop-in power reduction.

Technical Context

The LF442AMH implements a dual-channel, internally trimmed JFET-input op-amp topology optimized for DC precision and low-power operation. Its input stage uses matched high-voltage JFETs to achieve 50 pA max input bias current and 7 μV/°C typical offset drift - critical for stable integrators and long-term sensor signal chains.

Each amplifier operates from ±3 V to ±18 V supplies, supports ±12 V output swing into 10 kΩ, and maintains 70 dB min CMRR and PSRR over full temperature range. The device's 1 MHz bandwidth and 1 V/μs slew rate preserve fidelity in fast D/A converter buffers and sample-and-hold circuits without excessive quiescent power.

Key Specifications

Pinout & Package

LF442AMH is housed in an 8-pin TO-99 metal can package (8.96 mm diameter) with Pin 4 internally connected to the case for shielding and thermal conduction. The package provides superior EMI immunity and thermal stability versus plastic alternatives.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-power JFET-input op-amp applications.

Compared with LF442CN/NOPB, the LF442AMH adds −55°C to +125°C operation and TO-99 shielding for EMI-prone environments; versus TL072CP, it trades speed for 30% lower input bias current and guaranteed military-grade reliability - making it optimal for precision, low-drift, high-reliability analog systems.

Availability

LF442AMH is available at Aetrix Electronics and suitable for battery-powered instrumentation, military-grade sensor interfaces, and crystal oven control systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LF442AMH 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 decades of heritage in precision op-amps and military-grade components.

The LF442AMH belongs to TI's MIL-PRF-38535-qualified operational amplifier family, designed specifically for high-reliability analog signal conditioning in defense, aerospace, and critical industrial systems where low power, low drift, and extreme temperature resilience are mandatory.

FAQ

What is the maximum supply voltage for LF442AMH?

The LF442AMH supports absolute maximum supply voltages of ±18 V, with recommended operating range at ±15 V. Operation at ±18 V is permissible for short durations but may accelerate aging under continuous stress; for reliable long-term use in military applications, TI specifies ±15 V as the nominal supply. The LF442AMH maintains full DC and AC specifications across its rated −55°C to +125°C temperature range at ±15 V.

Is LF442AMH pin-compatible with LM1458?

Yes, LF442AMH is fully pin-compatible with LM1458 in functional configuration - both are dual op-amps with identical 8-pin TO-99 pinout (Pins 1–8 assigned to Output A, Inverting Input A, Noninverting Input A, V−/Case, Noninverting Input B, Inverting Input B, Output B, V+). This allows direct substitution in legacy LM1458 designs, delivering immediate 90% supply current reduction without layout changes.

What does the "MH" suffix indicate in LF442AMH?

The "MH" suffix in LF442AMH denotes Texas Instruments' military-grade TO-99 package variant: "M" signifies compliance with MIL-PRF-38535 Class B requirements (including screening, testing, and traceability), and "H" specifies the hermetically sealed TO-99 metal can package. This distinguishes it from commercial variants like LF442CN (C = commercial temp, N = PDIP) and confirms its suitability for high-reliability applications.

Does LF442AMH require external compensation capacitors?

No, LF442AMH is unity-gain stable and does not require external compensation capacitors for standard configurations. Its internal compensation ensures phase margin >60° at unity gain. However, when driving capacitive loads >100 pF or using very high feedback resistances (>1 MΩ), a small series resistor (10–100 Ω) at the output is recommended to isolate capacitance and maintain stability - as documented in TI's application notes for TO-99 op-amps.

How does LF442AMH handle input common-mode voltage extremes?

The LF442AMH supports input common-mode voltage from −12 V to +14 V with ±15 V supplies. Exceeding the negative common-mode limit (e.g., below −12 V) forces the output high; exceeding both inputs' negative limit causes latch-up-free recovery upon return to range. Positive common-mode excursions beyond +14 V do not invert phase but reduce GBW and slew rate - design margins should keep inputs within ±11 V for optimal AC performance.