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Texas Instruments LF347MX
- Part No.:
- LF347MX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF347MX.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,646
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Product details
Overview
LF347MX from Texas Instruments is a quad JFET-input operational amplifier optimized for high-speed, low-input-bias-current applications including precision integrators, sample-and-hold circuits, and D/A converter buffers. It delivers 4 MHz gain-bandwidth, 13 V/μs slew rate, 5 mV max input offset voltage, and 50 pA typical input bias current across the 0°C to 70°C commercial temperature range.
For engineers reviewing the LF347MX datasheet, LF347MX pinout, LF347MX application, or LF347MX equivalent, key selection criteria include its SOIC-14 package, JFET input stage enabling ultra-high input impedance (10¹² Ω), low 1/f noise corner (50 Hz), and compatibility with ±15 V supplies in signal conditioning and analog front-end designs.
Technical Context
The LF347MX implements a BI-FET II™ architecture with individually biased JFET input stages, enabling stable operation down to ±4.5 V supplies while maintaining wide bandwidth and fast settling (2 μs to 0.01%). Its internal offset voltage trimming eliminates need for external nulling circuitry.
It features rail-to-rail output swing capability (±12 V into 10 kΩ), high common-mode rejection (70–100 dB), and supply voltage rejection (70–100 dB), making it suitable for noisy industrial environments where CMRR and PSRR stability are critical for DC-coupled sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 4 MHz - supports stable closed-loop operation up to 100 kHz at unity-gain compensation. |
| Slew Rate | 13 V/μs - enables accurate reproduction of fast-rising signals without distortion in active filters. |
| Input Offset Voltage | 5 mV max - ensures ≤0.5% error in 1 V full-scale precision instrumentation amplifiers. |
| Input Bias Current | 50 pA typ - minimizes voltage error across high-impedance source networks (>100 MΩ). |
| Input Impedance | 10¹² Ω - preserves signal integrity in photodiode and piezoelectric sensor interfaces. |
| Supply Voltage Range | ±15 V - compatible with standard dual-rail analog power domains without regulation overhead. |
| Total Harmonic Distortion | ≤0.02% - maintains fidelity in audio and waveform generation paths up to 20 kHz. |
Pinout & Package
LF347MX is housed in a 14-pin SOIC (D) package per JEDEC MS-012 AB, 3.9 mm body width, 1.75 mm max height, tape-and-reel packaging (2500 pcs/reel), RoHS-compliant Sn finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output; drives loads ≥2 kΩ to ±10 V over full temperature range. |
| 2 | Inverting Input A | Differential input node for amplifier A; accepts common-mode voltages up to ±11 V. |
| 3 | Non-Inverting Input A | Differential input node for amplifier A; matched bias current to pin 2 enables low-offset configurations. |
| 4 | V− | Negative supply rail connection; must not be exceeded by either input voltage to prevent latch-up. |
| 5 | Non-Inverting Input B | Amplifier B positive input; electrically isolated but thermally coupled to other sections. |
| 6 | Inverting Input B | Amplifier B negative input; supports feedback networks up to 10 MΩ without significant drift. |
| 7 | Output B | Amplifier B output; shares same drive capability and thermal characteristics as pin 1. |
| 8 | Output C | Amplifier C output; independent channel with identical AC/DC specs to pins 1 and 7. |
| 9 | Inverting Input C | Amplifier C negative input; supports unity-gain stable configurations without external compensation. |
| 10 | Non-Inverting Input C | Amplifier C positive input; referenced to same zener bias network as all four amplifiers. |
| 11 | V+ | Positive supply rail; decoupling capacitor (0.1 μF) required within 1 cm for stability. |
| 12 | Non-Inverting Input D | Amplifier D positive input; usable as reference buffer in multi-channel data acquisition systems. |
| 13 | Inverting Input D | Amplifier D negative input; supports differential input configurations with matched resistor networks. |
| 14 | Output D | Amplifier D output; fully specified for THD, settling time, and noise performance per datasheet Table 1. |
Key Features
| Feature | Design Value |
|---|---|
| Internally trimmed offset voltage | 5 mV max eliminates need for external potentiometer adjustment in production calibration. |
| JFET input stage | 50 pA input bias current enables direct interfacing with high-Z sensors without guard traces. |
| Low 1/f noise corner | 50 Hz allows stable DC-coupled operation in precision weighing and strain gauge bridges. |
| Fast 0.01% settling | 2 μs supports 500 kSPS sampling in multiplexed ADC driver applications. |
| High input impedance | 10¹² Ω prevents loading errors in RC timing networks and passive filter cascades. |
Applications
| Digitally Selectable Attenuator | Long-Time Integrator |
|---|---|
|
Use Scenario: Precision programmable gain control in automated test equipment using 1% resistors and digital switches. IC Role / Device Role / Timing Role: Quad op-amp configured as three inverting amplifiers and one summing node to implement 8-step attenuation with no offset drift. Use Value: Achieves better than 0.4% accuracy without manual trimming, leveraging matched input bias currents and low offset voltage. |
Use Scenario: Integration of low-frequency sensor outputs (e.g., thermocouple, pH electrode) over minutes to hours with reset/halt functionality. IC Role / Device Role / Timing Role: One amplifier acts as integrator core, another as comparator for threshold detection, third as hold buffer, fourth as reset switch driver. Use Value: Enables zero-start integration with sub-mV baseline stability, supported by low 1/f noise and <0.02% THD. |
| Universal State Variable Filter | High-Speed D/A Converter Buffer |
|
Use Scenario: Reconfigurable analog filter bank in communications transceivers requiring simultaneous high-pass, band-pass, low-pass, and notch responses. IC Role / Device Role / Timing Role: Four amplifiers implement second-order transfer functions with independent Q and f₀ tuning via resistor networks. Use Value: Delivers 10 V peak sinusoidal output up to 200 kHz without slew limiting, enabled by 13 V/μs slew rate and 4 MHz GBW. |
Use Scenario: Driving 12-bit DAC outputs into 50 Ω coaxial cables or capacitive loads in waveform generators and arbitrary function units. IC Role / Device Role / Timing Role: Output buffer isolating DAC core from load variations; configured as unity-gain follower with low output impedance. Use Value: Maintains monotonicity and settling within 2 μs to 0.01%, preventing code-dependent glitches in high-speed DAC systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad JFET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L4CD | Lower supply current (1.4 mA vs. 7.2 mA), lower GBW (850 kHz), higher offset (10 mV max) | Better suited for battery-powered, low-speed sensor interfaces; insufficient for >100 kHz signal paths | Select when ultra-low power dominates over speed and precision |
| TL084CD | Higher slew rate (13 V/μs same), higher input bias (30 pA vs. 50 pA), untrimmed offset (15 mV max) | Requires external nulling for precision DC applications; wider noise bandwidth limits low-frequency use | Select when cost sensitivity outweighs need for guaranteed low offset and low 1/f noise |
Compared with TLC27L4CD and TL084CD, the LF347MX provides superior DC precision (5 mV offset vs. 10–15 mV), lower 1/f noise corner (50 Hz vs. 200+ Hz), and guaranteed settling performance-making it the preferred choice for production-grade analog signal chains demanding repeatability without calibration.
Availability
LF347MX is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and analog signal conditioning requiring stable component supply across extended production lifecycles.
Supply support for LF347MX 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 over 50 years of op-amp innovation and manufacturing excellence.
The LF347MX belongs to TI's legacy BI-FET II™ op-amp family, designed specifically for high-speed, low-input-current analog signal processing in industrial, test & measurement, and medical equipment where JFET inputs deliver critical performance advantages.
FAQ
What is the maximum operating temperature range for the LF347MX?
The LF347MX is rated for the commercial temperature range of 0°C to 70°C, as confirmed in the Absolute Maximum Ratings table and Operating Temperature Range section of the SNOSBH1D datasheet. This differs from the military-grade LF147, which operates from −55°C to 125°C. The LF347MX's thermal resistance (θjA) is 100°C/W in SOIC package, requiring derating above ambient 50°C for continuous full-load operation.
Does the LF347MX require external offset nulling circuitry?
No, the LF347MX does not require external offset nulling circuitry because it features internally trimmed input offset voltage, specified at 5 mV maximum across temperature. This trimming is part of the BI-FET II™ process and is verified during production test, eliminating the need for user-adjustable potentiometers or external compensation networks in most precision applications.
Can the LF347MX drive a 2 kΩ load to ±10 V over temperature?
Yes, the LF347MX is explicitly characterized to drive a 2 kΩ load to ±10 V over the full 0°C to 70°C operating temperature range, as stated in the "APPLICATION HINTS" section and confirmed in the VO parameter row of the DC Electrical Characteristics table. Performance remains within specification under these conditions, though heavier loads may increase offset voltage on negative swings.
What is the input common-mode voltage range for the LF347MX?
The LF347MX supports an input common-mode voltage range of ±11 V with ±15 V supplies, as specified in the DC Electrical Characteristics table under VCM. Exceeding the negative limit forces the output high; exceeding both limits causes output saturation. Neither condition results in latch-up, and normal operation resumes once inputs return within range.
Is the LF347MX pin-compatible with the LM148?
No-the LF347MX is not pin-compatible with the LM148. While the datasheet states that the LF147 (not LF347) is pin-compatible with the LM148, the LF347 series uses the same SOIC-14 pinout as the LF147 but differs in supply voltage ratings (±15 V vs. ±22 V) and temperature range. Pin mapping matches LF147/LF347 family conventions, not LM148.
LF347MX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 13V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 7.2mA (x4 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LF347MX FAQ
1.How can I place an order for LF347MX through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347MX 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 LF347MX reliable?
The price and inventory of LF347MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347MX is usually 5 days.
3.What payment methods are accepted for LF347MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347MX?
LF347MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347MX 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 LF347MX?
For technical support, including LF347MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347MX requirements.
6.How does Aetrix verify that LF347MX is sourced from the original manufacturer or authorized distributors?
All LF347MX 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 LF347MX meets industry standards.
7.What is the process for return or replacement of LF347MX?
All LF347MX units undergo pre-shipment inspection (PSI). If there is an issue with LF347MX, 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 LF347MX part is unused and in its original packaging.
Return procedure for LF347MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF347MX Tags
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