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Texas Instruments LF412 MWC
- Part No.:
- LF412 MWC
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
LF412 MWC.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT WAFER
- Quantity:
- Payment:
- Shipping:
Inventory:1,207
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Product details
Overview
LF412 MWC from Texas Instruments is a dual JFET-input operational amplifier optimized for precision, low-noise, and low-power analog signal conditioning in industrial and consumer systems. It delivers ±10 pA typical input bias current, 4.5 MHz gain bandwidth, 21 V/μs slew rate (VID = 1 V), ±14.95 V output swing (RL = 10 kΩ), and operates across 0°C to 70°C. It serves as a VCOM driver in TFT-LCD panels and high-side sensing amplifier.
For engineers reviewing the LF412 MWC datasheet, LF412 MWC pinout, LF412 MWC application, or LF412 MWC equivalent, key selection criteria include ultra-low input bias current for high-impedance sensor interfacing, FET-input noise performance (2 fA/√Hz), supply current efficiency (0.560 mA per amplifier), and SOIC-8 compatibility with legacy LF412C designs.
Technical Context
The LF412 MWC implements a matched dual JFET-input stage with internally trimmed offset voltage and low drift (±0.3 μV/°C), enabling stable DC-coupled operation in integrators and precision buffers. Its architecture supports rail-to-rail input common-mode range (±11.5 V to +14.5 V) and delivers 130 dB large-signal open-loop gain at 25°C.
It features 540 GΩ differential input resistance and 6 TΩ common-mode input resistance, minimizing loading on high-Z sources such as piezoelectric sensors or photodiode transimpedance nodes. The device maintains 120 dB crosstalk attenuation at 1 kHz, ensuring channel isolation in dual-channel instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input bias current | ±10 pA typ - enables accurate measurement from >100 MΩ source impedances without significant error. |
| Gain bandwidth product | 4.5 MHz typ - supports stable unity-gain buffering of signals up to ~4.5 MHz with minimal phase lag. |
| Slew rate | 21 V/μs typ (VID = 1 V) - allows faithful reproduction of fast transient signals like pulse-width modulated VCOM waveforms. |
| Input offset voltage | ±0.125 mV typ - reduces DC error in precision amplification stages without external nulling circuitry. |
| Supply current per amp | 0.560 mA typ - permits dual-amplifier operation from low-power rails (e.g., ±5 V) while maintaining speed. |
| Output voltage swing | ±14.95 V typ (RL = 10 kΩ, ±15 V supplies) - delivers near-rail output headroom for dynamic range preservation. |
| Common-mode input range | −11.5 V to +14.5 V - accommodates inputs beyond negative rail, critical for single-supply high-side current sensing. |
Pinout & Package
LF412 MWC is supplied in an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm with 1.27 mm lead pitch and 1.75 mm max height. Pin 1 is marked by a beveled corner or dot; the device uses standard SOIC land pattern per IPC-7351.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Output, channel 1 | Low-impedance voltage source driving external load; requires local decoupling when sourcing >10 mA. |
| 1IN− | Inverting input, channel 1 | High-impedance node for feedback network connection; sensitive to PCB leakage and stray capacitance. |
| 1IN+ | Non-inverting input, channel 1 | High-Z reference point for sensor or signal source; must be guarded in ultra-low-current applications. |
| VCC− | Negative supply rail | Connects to most negative potential (e.g., −15 V); serves as return path for both amplifiers' quiescent current. |
| VCC+ | Positive supply rail | Connects to most positive potential (e.g., +15 V); powers internal bias networks and output stage. |
| 2OUT | Output, channel 2 | Independent output with identical drive capability and noise performance as channel 1. |
| 2IN− | Inverting input, channel 2 | Electrically isolated from channel 1 inputs; enables dual independent closed-loop configurations. |
| 2IN+ | Non-inverting input, channel 2 | Provides second high-impedance input node; shares same input stage topology and matching characteristics. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | Enables ±10 pA input bias current and 6 TΩ common-mode input resistance for minimal loading of high-Z sources. |
| Internally trimmed offset voltage | Reduces initial DC error to ±0.125 mV, eliminating need for external potentiometer-based nulling in production systems. |
| Low input noise current | 2 fA/√Hz typical ensures negligible current noise contribution in transimpedance amplifier configurations. |
| High crosstalk attenuation | 120 dB at 1 kHz prevents inter-channel signal coupling in dual-channel data acquisition or stereo audio paths. |
| Wide supply range | Operates from ±3.5 V to ±18 V, supporting both low-voltage portable designs and high-dynamic-range industrial systems. |
Applications
| TFT-LCD VCOM Driver | A/D Converter Buffer |
|---|---|
|
Use Scenario: Driving the common electrode (VCOM) of active-matrix LCD panels requiring precise, low-distortion AC waveform generation. IC Role / Device Role / Timing Role: Dual-channel voltage follower providing matched, low-output-impedance drive for VCOM and reference signals. Use Value: 21 V/μs slew rate and ±14.95 V swing ensure full-panel pixel charging within frame timing constraints without droop or overshoot. |
Use Scenario: Isolating and scaling analog sensor outputs before digitization in 12–16-bit SAR or sigma-delta ADC systems. IC Role / Device Role / Timing Role: Precision unity-gain buffer with ultra-low input bias current preserving signal integrity from high-impedance sources. Use Value: ±10 pA input bias current prevents measurable offset shift in 10 MΩ+ sensor bridges, maintaining ADC accuracy over temperature. |
| High-Side Current Sensing | Headphone Amplifier |
|
Use Scenario: Measuring load current in automotive or industrial power supplies by amplifying the voltage across a shunt resistor placed on the high-side rail. IC Role / Device Role / Timing Role: Difference amplifier configured with matched external resistors to reject common-mode voltage up to +14.5 V. Use Value: Common-mode input range extending to +14.5 V allows direct connection to 12 V or 24 V bus without level-shifting circuitry. |
Use Scenario: Delivering low-distortion audio to stereo headphones in portable media players or docking stations. IC Role / Device Role / Timing Role: Dual-channel line driver with low THD+N (<−96 dB at 1 kHz) and sufficient output current (±10 mA). Use Value: 4.5 MHz bandwidth and 21 V/μs slew rate preserve transient response in music signals, avoiding audible softening or smearing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual FET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CDR | Lower supply current (120 µA/amp) but reduced GBW (1.7 MHz) and slew rate (0.045 V/μs); no specified input bias current below 100 pA. | Better suited for ultra-low-power battery monitoring than high-speed VCOM or audio buffering. | Select when quiescent current is primary constraint and bandwidth < 2 MHz suffices. |
| OPA2134PA | Higher precision (±0.5 mV VIO max), lower noise (8 nV/√Hz), but higher supply current (4 mA/amp) and cost; SOIC-8 pinout compatible. | Preferred for studio-grade audio or medical instrumentation where noise and distortion dominate over power. | Choose when THD+N < −105 dB and input voltage noise < 10 nV/√Hz are required. |
Compared with TLC27L2CDR and OPA2134PA, the LF412 MWC uniquely balances sub-1 nA input bias current, 4.5 MHz bandwidth, and 0.56 mA supply current in a cost-optimized SOIC-8 package-making it optimal for mid-performance industrial analog front-ends where FET-input integrity and speed coexist under tight power budgets.
Availability
LF412 MWC is available at Aetrix Electronics and suitable for TFT-LCD panel manufacturing, precision data acquisition systems, and high-side current sensing applications requiring stable component supply and long-term industrial availability.
Supply support for LF412 MWC 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, embedded processing, and digital signal technologies with over 50 years of op-amp innovation.
The LF412 product line was engineered for cost-sensitive, high-input-impedance analog signal conditioning in industrial control, test equipment, and display electronics-prioritizing FET-input fidelity without premium pricing.
FAQ
What is the operating temperature range for the LF412 MWC?
The LF412 MWC is characterized for operation from 0°C to 70°C, matching the commercial temperature grade of the LF412C family. It does not support extended industrial (−40°C to +85°C) or automotive ranges. This specification is confirmed in Section 3 (Description) and Table 5.2 (Recommended Operating Conditions) of the TI SLOS010C datasheet. Designers requiring wider ambient tolerance should verify thermal derating of parameters like input bias current and offset drift outside this range.
Is the LF412 MWC pin-compatible with other LF412 variants like LF412CD or LF412CP?
Yes, the LF412 MWC shares identical pinout, electrical specifications, and SOIC-8 (D) package dimensions with the LF412CD and LF412CDR variants. All use the same 8-pin configuration shown in Figure 4-1 and Table 4-1 of the datasheet. However, LF412CP (PDIP-8) has identical pin functions but different mechanical footprint and thermal characteristics-PCB layout must be adapted accordingly.
Does the LF412 MWC support single-supply operation?
The LF412 MWC supports single-supply operation with appropriate biasing: its common-mode input range extends to −11.5 V relative to VCC−, meaning it can accept inputs down to the negative rail. When powered from +5 V and ground, VCC− = 0 V and VCC+ = +5 V, allowing inputs from 0 V to +3.5 V (per VICR spec). Output swing remains asymmetric (e.g., ~0.05 V to ~4.95 V), so level-shifting or rail-splitting may be needed for true AC-coupled signals.
What is the maximum differential input voltage rating for the LF412 MWC?
The absolute maximum differential input voltage (VID) for the LF412 MWC is ±30 V, as specified in Table 5.1 (Absolute Maximum Ratings). Exceeding this risks permanent damage to the JFET input stage. This limit applies regardless of supply voltage and must be respected during power-up sequencing, fault conditions, or transient events-even if the common-mode voltage remains within range.
How does the "new die" revision affect LF412 MWC performance?
The LF412 MWC uses the modern "new die" fabrication introduced in revision C of the SLOS010C datasheet, identified by Chip Source Origin (CSO) code "RFB". It improves upon the legacy "old die" (CSO "SHE") with tighter specs: input bias current improved from 50 pA to ±10 pA typ, slew rate increased from 13 V/μs to 21 V/μs, and gain bandwidth raised from 3 MHz to 4.5 MHz-all verified in Tables 5.3 and 5.4. These enhancements directly benefit LF412 MWC's performance in high-speed and low-leakage applications.
LF412 MWC 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:
- 13V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 4.5mA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Wafer
LF412 MWC FAQ
1.How can I place an order for LF412 MWC through Aetrix?
Please submit a Request for Quotation (RFQ) for LF412 MWC 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 LF412 MWC reliable?
The price and inventory of LF412 MWC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF412 MWC is usually 5 days.
3.What payment methods are accepted for LF412 MWC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF412 MWC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF412 MWC?
LF412 MWC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF412 MWC 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 LF412 MWC?
For technical support, including LF412 MWC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF412 MWC requirements.
6.How does Aetrix verify that LF412 MWC is sourced from the original manufacturer or authorized distributors?
All LF412 MWC 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 LF412 MWC meets industry standards.
7.What is the process for return or replacement of LF412 MWC?
All LF412 MWC units undergo pre-shipment inspection (PSI). If there is an issue with LF412 MWC, 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 LF412 MWC part is unused and in its original packaging.
Return procedure for LF412 MWC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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