My Inquiry
My Account
Texas Instruments LF442-MWA
- Part No.:
- LF442-MWA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
LF442-MWA.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT WAFER
- Quantity:
- Payment:
- Shipping:
Inventory:2,586
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LF442-MWA from Texas Instruments is a dual low-power JFET-input operational amplifier designed for precision analog signal conditioning in space-constrained, low-power systems. It delivers 1 MHz gain-bandwidth, 1 V/μs slew rate, 400 μA max supply current, 50 pA max input bias current, and 1 mV max input offset voltage - enabling high-accuracy amplification in battery-powered instrumentation and sensor interfaces.
For engineers reviewing the LF442-MWA datasheet, LF442-MWA pinout, LF442-MWA application, or LF442-MWA equivalent, key selection criteria include its JFET-input architecture for ultra-low bias current, military-grade temperature range (−55°C to 125°C), TO-99 metal-can package compatibility, and pin-for-pin equivalence with LM1458 for drop-in power reduction.
Technical Context
The LF442-MWA integrates two independent high-impedance JFET-input op-amps on a single die, each featuring internally trimmed input offset voltage and matched input devices to minimize drift and offset. Its architecture supports rail-to-rail output swing (±12 V into 10 kΩ) while maintaining stable AC performance across −55°C to 125°C.
It operates from ±3 V to ±18 V supplies, achieves 70 dB minimum CMRR and PSRR, and exhibits low noise (35 nV/√Hz input voltage noise, 0.01 pA/√Hz input current noise), making it suitable for high-resolution data acquisition where DC accuracy and low-frequency stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 400 μA max - enables 10× lower power than LM1458 in legacy designs without sacrificing bandwidth or slew rate. |
| Input Bias Current | 50 pA max at 25°C - supports high-impedance sensor interfacing (e.g., piezoelectric, pH electrodes) with minimal loading error. |
| Input Offset Voltage | 1 mV max - ensures <0.1% gain error in unity-gain buffer or precision gain stages without external trimming. |
| Gain-Bandwidth Product | 1 MHz - supports stable closed-loop operation up to 100 kHz at gain = 10, suitable for anti-aliasing and active filtering. |
| Slew Rate | 1 V/μs - enables faithful reproduction of 159 kHz full-scale sine waves without distortion in signal conditioning paths. |
| Input Impedance | 10¹² Ω - preserves signal integrity in high-Z transducer circuits and prevents bias current–induced offset in integrators. |
| Common-Mode Range | ±11 V - allows operation with inputs near supply rails, supporting wide-dynamic-range sensor outputs in industrial control. |
Pinout & Package
LF442-MWA is supplied in a hermetically sealed TO-99 metal-can package (8-pin, 8.96 mm diameter), identical in footprint and pin assignment to LF442-MILAMH and LM1458. The case is electrically connected to Pin 4 (V−), providing inherent EMI shielding and thermal conduction path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Output A | Amplifier A output; capable of ±12 V swing into 10 kΩ load; requires local 0.1 μF decoupling to ground. |
| Pin 2 | Inverting Input A | High-impedance differential input for Amplifier A; sensitive to PCB leakage and EMI without guard ring. |
| Pin 3 | Noninverting Input A | High-impedance differential input for Amplifier A; must be referenced within common-mode range (±11 V). |
| Pin 4 | V− / Case | Negative supply terminal and metallized case connection; must be tied to system ground or negative rail for shielding. |
| Pin 5 | Noninverting Input B | High-impedance differential input for Amplifier B; electrically isolated from Amplifier A except via shared supply rails. |
| Pin 6 | Inverting Input B | High-impedance differential input for Amplifier B; layout symmetry recommended to match Amplifier A parasitics. |
| Pin 7 | Output B | Amplifier B output; independently driven; shares thermal mass with Output A but no internal coupling. |
| Pin 8 | V+ | Positive supply terminal; requires dedicated 0.1 μF ceramic capacitor to Pin 4 (V−) for high-frequency stability. |
Key Features
| Feature | Design Value |
|---|---|
| JFET Input Stage | Enables 50 pA max input bias current - critical for integrating capacitors >1 nF and high-resistance feedback networks. |
| Internally Trimmed Offset | 1 mV max input offset voltage - eliminates need for external nulling circuitry in precision DC-coupled amplifiers. |
| Military Temperature Range | Operates from −55°C to 125°C - qualified for aerospace, defense, and downhole instrumentation without derating. |
| Pin-Compatible with LM1458 | Direct replacement in existing PDIP or TO-99 layouts - reduces system power by 90% without PCB revision. |
| Low Input Noise | 35 nV/√Hz voltage noise + 0.01 pA/√Hz current noise - optimal for low-level signal amplification before ADC front-ends. |
Applications
| Battery-Powered Strip Chart Preamplifier | "No FET" Low-Power V-to-F Converter |
|---|---|
Use Scenario: Signal conditioning for portable electrochemical sensors logging pH or dissolved oxygen over extended periods on 9 V batteries. IC Role / Device Role / Timing Role: Dual op-amp provides gain-stable preamplification and active filtering; one section buffers sensor output, the other drives strip chart recorder with minimal loading. Use Value: 400 μA total supply current extends battery life >10× versus LM1458, while 1 mV offset ensures sub-mV measurement accuracy over temperature. | Use Scenario: Converting analog sensor voltages (e.g., thermocouple outputs) to frequency for noise-immune transmission over long cables in industrial PLCs. IC Role / Device Role / Timing Role: One amplifier acts as integrator, the other as comparator in a relaxation oscillator topology - eliminating discrete FET reset switches. Use Value: JFET input prevents integrator drift from bias current; 1 V/μs slew rate ensures clean zero-crossing detection at 1 kHz full scale. |
| High-Efficiency Crystal Oven Controller | Conventional Log Amplifier |
Use Scenario: Maintaining precise 75°C oven temperature for OCXO stability in satellite timing modules under wide ambient swings. IC Role / Device Role / Timing Role: One amplifier compares LM335 sensor voltage to reference; the other implements duty-cycle modulated heater drive with fast transient response. Use Value: 7 μV/°C offset drift minimizes temperature setpoint error; TO-99 package enables direct thermal coupling to oven block. | Use Scenario: Compressing wide-dynamic-range photodiode currents (10 nA–1 mA) into 0–10 V for digitization in optical spectrometers. IC Role / Device Role / Timing Role: Configured as transimpedance amplifier with diode-connected transistor in feedback - leveraging ultra-low bias current to avoid log compression error. Use Value: 50 pA input bias current ensures <0.1% error at 10 nA input; 1 MHz GBW supports stable operation with 100 pF photodiode capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual JFET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LF442AMH | Identical electrical specs and TO-99 package; differs only in marking (LF442AMH vs LF442-MWA) and RoHS status (non-RoHS). | Same military temp range and pinout; used interchangeably in defense/aerospace builds where RoHS exemption applies. | Select LF442AMH when sourcing from TI's standard production line with non-RoHS compliance required. |
| LM1458CN | Higher 4 mA supply current, 500 nA input bias current, 5 mV offset voltage - 100× higher power and 10,000× higher bias current than LF442-MWA. | Compatible only in commercial-temp (0°C to 70°C), non-critical applications where power and precision are secondary. | Choose LM1458CN only for cost-sensitive, non-battery, non-precision legacy upgrades where PCB layout cannot change. |
Compared with LF442AMH, LF442-MWA offers identical performance but reflects TI's wafer-sale (YS) orderable variant with distinct traceability; versus LM1458CN, LF442-MWA delivers 10× lower power, 10⁴× lower bias current, and extended temperature range - justifying redesign effort in any new low-power precision design.
Availability
LF442-MWA is available at Aetrix Electronics and suitable for battery-powered instrumentation, aerospace sensor signal chains, crystal oven control loops, and precision analog front-ends requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LF442-MWA 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 high-reliability op-amp design for defense, space, and industrial markets.
The LF442-MWA belongs to TI's MIL-PRF-38535 qualified JFET-input op-amp family, engineered specifically for low-power, high-precision analog signal conditioning in mission-critical systems operating across −55°C to 125°C.
FAQ
What is the operating temperature range of the LF442-MWA?
The LF442-MWA is specified for operation from −55°C to 125°C, meeting MIL-PRF-38535 requirements for military-grade reliability. This range is validated across all electrical parameters in the datasheet, including input offset voltage drift (7 μV/°C typ), supply current (400 μA max), and output swing (±12 V). The TO-99 metal-can package contributes to thermal stability in harsh environments.
Is the LF442-MWA pin-compatible with the LM1458?
Yes, the LF442-MWA is pin-compatible with the LM1458 in both TO-99 and PDIP packages. Pin assignments for V+, V−, inverting/noninverting inputs, and outputs are identical. This allows direct substitution in existing designs, delivering immediate 90% supply current reduction without PCB changes - a key advantage confirmed in TI's SNOSD59 datasheet Section 7.1 and Figure 27.
What is the maximum supply voltage rating for the LF442-MWA?
The LF442-MWA has an absolute maximum supply voltage rating of ±18 V, as stated in Section 6.1 of the SNOSD59 datasheet. Recommended operating conditions specify ±15 V, but the device maintains full functionality up to ±18 V. Exceeding ±18 V risks permanent damage; note that differential input voltage rating is ±30 V, independent of supply rails.
Does the LF442-MWA require external offset nulling?
No, the LF442-MWA does not require external offset nulling. Its input offset voltage is factory-trimmed to ≤1 mV (max) across temperature, as verified in Section 6.5 DC Electrical Characteristics. This internal trimming - achieved via laser adjustment during production - eliminates the need for external potentiometers or calibration circuitry in most precision applications, reducing BOM count and board area.
What package type is used for the LF442-MWA?
The LF442-MWA is supplied in a TO-99 metal-can package (8-pin, 8.96 mm diameter), with Pin 4 internally connected to the case. This hermetic package provides superior EMI immunity, thermal conductivity, and long-term reliability versus plastic alternatives - essential for aerospace, defense, and high-stability timing applications where the LF442-MWA is commonly deployed.
LF442-MWA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 300µA (x2 Channels)
- Current - Output / Channel:
- 6.8 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Wafer
LF442-MWA FAQ
1.How can I place an order for LF442-MWA through Aetrix?
Please submit a Request for Quotation (RFQ) for LF442-MWA 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 LF442-MWA reliable?
The price and inventory of LF442-MWA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF442-MWA is usually 5 days.
3.What payment methods are accepted for LF442-MWA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF442-MWA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF442-MWA?
LF442-MWA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF442-MWA 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 LF442-MWA?
For technical support, including LF442-MWA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF442-MWA requirements.
6.How does Aetrix verify that LF442-MWA is sourced from the original manufacturer or authorized distributors?
All LF442-MWA 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 LF442-MWA meets industry standards.
7.What is the process for return or replacement of LF442-MWA?
All LF442-MWA units undergo pre-shipment inspection (PSI). If there is an issue with LF442-MWA, 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 LF442-MWA part is unused and in its original packaging.
Return procedure for LF442-MWA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF442-MWA Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
