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Texas Instruments LF412CP
- Part No.:
- LF412CP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LF412CP.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,027
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Product details
Overview
LF412CP from Texas Instruments is a dual JFET-input operational amplifier optimized for precision, low-input-current applications including TFT-LCD VCOM drivers, A/D converter buffers, and high-/low-side current sensing. It delivers ±10 pA typical input bias current, 4.5 MHz gain bandwidth, 21 V/μs slew rate (VID = 1 V), and operates across 0°C to 70°C.
For engineers reviewing the LF412CP datasheet, LF412CP pinout, LF412CP application, or LF412CP equivalent, key selection criteria include ultra-low input bias current, rail-to-rail output swing capability (±14.95 V at RL = 10 kΩ), internal offset voltage trimming, and PDIP-8 packaging for through-hole prototyping and industrial analog signal conditioning.
Technical Context
The LF412CP uses a matched dual JFET-input stage enabling ultra-low input bias and offset currents, with internally trimmed offset voltage (±0.125 mV typ) and low drift (±0.3 μV/°C typ). Its high input impedance (>540 GΩ differential, >6 TΩ common-mode) supports high-impedance sensor interfacing without loading.
It features a wide 4.5 MHz unity-gain bandwidth and fast 21 V/μs slew rate under 1 V differential input, supporting accurate high-speed signal buffering and integration. The device maintains stable operation with supply voltages from ±3.5 V to ±18 V and achieves 130 dB large-signal open-loop gain at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input bias current | ±10 pA typ - enables direct connection to high-impedance sources (e.g., photodiodes, piezoelectric sensors) without significant error. |
| Gain bandwidth product | 4.5 MHz typ - supports stable closed-loop operation up to ~400 kHz in unity-gain buffer configuration with 100 pF load. |
| Slew rate | 21 V/μs typ (VID = 1 V) - ensures faithful reproduction of fast-rising analog signals such as DAC outputs or pulse-width modulated references. |
| Input offset voltage | ±0.125 mV typ - reduces DC error in precision integrators and instrumentation front-ends without external nulling circuitry. |
| Common-mode input range | −11.5 V to +14.5 V (±15 V supplies) - allows operation with inputs near negative rail, critical for single-supply sensing topologies. |
| Output voltage swing | ±14.95 V min (RL = 10 kΩ) - delivers full dynamic range into moderate loads, minimizing headroom loss in ±15 V systems. |
| Supply current per amp | 0.560 mA typ - enables dual-channel precision amplification with sub-1.2 mA total quiescent draw, suitable for power-sensitive analog subsystems. |
Pinout & Package
LF412CP is housed in an 8-pin plastic dual in-line package (PDIP), measuring 9.81 mm × 6.35 mm, with standard through-hole footprint and 2.54 mm pin pitch. The package is RoHS-compliant with NiPdAu lead finish and rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Output, channel 1 | Low-impedance buffered output capable of sourcing/sinking ≥40 mA; connects directly to ADC reference inputs or LCD VCOM lines. |
| 1IN− | Inverting input, channel 1 | Differential input node for feedback configuration; high-impedance (≥540 GΩ) minimizes current-induced offset in transimpedance stages. |
| 1IN+ | Non-inverting input, channel 1 | High-Z input for voltage sensing; common-mode range extends within 1.5 V of rails, enabling rail-referenced signal acquisition. |
| VCC− | Negative supply terminal | Connects to most-negative system potential (e.g., −15 V); serves as return path for both amplifiers' bias and output current. |
| VCC+ | Positive supply terminal | Connects to most-positive system potential (e.g., +15 V); powers both amplifiers and defines upper common-mode limit. |
| 2OUT | Output, channel 2 | Independent output for second signal path; crosstalk attenuation >120 dB at 1 kHz enables simultaneous dual-channel precision processing. |
| 2IN− | Inverting input, channel 2 | Second differential input; electrically isolated from channel 1 except via shared supply rails and substrate coupling. |
| 2IN+ | Non-inverting input, channel 2 | Second high-Z input; identical electrical characteristics to 1IN+, allowing matched dual-sensor conditioning. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | ±10 pA typ enables direct interface with megohm-range sensors (e.g., pH electrodes, capacitive touch) without guard rings or bootstrapping. |
| Internally trimmed offset voltage | ±0.125 mV typ eliminates need for external potentiometer adjustment in production-grade instrumentation circuits. |
| High slew rate with low noise | 21 V/μs slew + 2 fA/√Hz input noise supports clean amplification of fast, low-current signals like photodiode pulses. |
| Wide common-mode input range | −11.5 V to +14.5 V on ±15 V supplies allows use in high-side current sensing where input exceeds ground by >11 V. |
| Stable unity-gain operation | 4.5 MHz GBW with no minimum gain requirement permits robust buffer use without external compensation components. |
| Low supply current per channel | 0.560 mA typ supports dual-channel precision analog functions in battery-backed or thermally constrained systems. |
Applications
| TFT-LCD VCOM Driver | A/D Converter Buffer |
|---|---|
|
Use Scenario: Driving the common electrode (VCOM) of active-matrix LCD panels to minimize flicker and image retention. IC Role / Device Role / Timing Role: Precision DC voltage source with low drift and high output drive capability, maintaining stable VCOM bias during frame updates. Use Value: ±0.125 mV offset and <±0.3 μV/°C drift ensure consistent gray-scale uniformity across temperature; ±14.95 V swing covers full panel voltage range. |
Use Scenario: Isolating and scaling analog sensor outputs before digitization in data acquisition systems. IC Role / Device Role / Timing Role: Unity-gain buffer with high input impedance and low noise, preventing ADC input loading and preserving SNR. Use Value: 540 GΩ input resistance avoids signal attenuation from high-Z sources (e.g., thermocouples with cold-junction compensation); 18 nV/√Hz noise preserves resolution in 16-bit+ systems. |
| High-Side Current Sensing | Headphone Amplifier |
|
Use Scenario: Measuring load current in automotive or industrial power rails where the sense resistor is placed between supply and load. IC Role / Device Role / Timing Role: Difference amplifier configured with matched external resistors to reject common-mode voltage while amplifying small shunt drops. Use Value: −11.5 V to +14.5 V common-mode range accommodates inputs up to 14.5 V above ground on ±15 V supplies; 100 dB CMRR suppresses supply ripple. |
Use Scenario: Delivering low-distortion audio to stereo headphones in portable media devices or desktop audio interfaces. IC Role / Device Role / Timing Role: Low-noise, low-THD voltage follower driving 16–32 Ω loads with minimal crossover distortion. Use Value: 21 V/μs slew rate prevents slew-induced distortion at 20 kHz; THD+N <−72 dB (1 kHz, 1 VRMS, RL = 32 Ω) ensures fidelity in consumer audio paths. |
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 |
|---|---|---|---|
| TLC27L2CP | Lower supply current (190 µA/amp), but reduced GBW (850 kHz) and slew rate (0.035 V/µs); offset voltage higher (±2 mV). | Better for ultra-low-power battery operation; unsuitable for >10 kHz signal buffering or fast settling. | Select when power budget is <200 µA/amp and bandwidth needs are <100 kHz. |
| TL072CP | Higher slew rate (13 V/µs), wider GBW (3 MHz), but higher input bias current (±30 pA) and no internal offset trim. | Preferred for audio line drivers and general-purpose AC-coupled amplification; less suited for DC-critical sensor interfaces. | Choose for cost-sensitive audio or medium-speed signal conditioning where ±30 pA bias is acceptable. |
Compared with TLC27L2CP and TL072CP, the LF412CP uniquely balances ultra-low input bias current (±10 pA), precision offset performance (±0.125 mV), and usable speed (4.5 MHz, 21 V/µs), making it optimal for DC-accurate, high-impedance analog front-ends where both precision and bandwidth matter.
Availability
LF412CP is available at Aetrix Electronics and suitable for TFT-LCD display modules, industrial data acquisition systems, and high-side current monitoring circuits requiring stable component supply across extended production lifecycles.
Supply support for LF412CP 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 and manufacturing excellence.
The LF412CP belongs to TI's legacy precision JFET-input op-amp family, designed specifically for applications demanding ultra-low input current, low offset drift, and reliable performance in industrial and display electronics environments.
FAQ
What is the maximum operating temperature range for the LF412CP?
The LF412CP is characterized for operation from 0°C to 70°C ambient temperature. This commercial-grade rating aligns with its intended use in non-automotive industrial and consumer display applications. Operation outside this range may result in degraded parameters including increased input bias current and offset drift; the absolute maximum junction temperature remains 150°C per datasheet limits.
Does the LF412CP support single-supply operation?
Yes, the LF412CP supports single-supply operation with appropriate biasing. When powered from +30 V and ground (i.e., VCC+ = +30 V, VCC− = 0 V), its common-mode input range extends from −11.5 V to +14.5 V relative to VCC−, meaning inputs can go 11.5 V below ground - so level-shifting or rail-splitting is required for true ground-referenced inputs. Output swing remains asymmetric but functional.
How does the LF412CP differ from the LF412CD in terms of performance and packaging?
The LF412CP and LF412CD share identical electrical specifications, including ±10 pA input bias current, 4.5 MHz gain bandwidth, and ±0.125 mV offset voltage. Their only difference is packaging: LF412CP uses an 8-pin PDIP (9.81 mm × 6.35 mm) for through-hole prototyping and legacy board assembly, while LF412CD uses an 8-pin SOIC (4.90 mm × 3.90 mm) for surface-mount production. Pinout and thermal characteristics are functionally equivalent.
Can the LF412CP drive capacitive loads without oscillation?
The LF412CP is not unity-gain stable with heavy capacitive loads. Datasheet testing shows stable operation with ≤100 pF at unity gain; larger loads require isolation resistors (e.g., 10–100 Ω in series with the output) or feedback network compensation. For applications like LCD VCOM driving where CL may exceed 1 nF, external RC snubbing or dedicated VCOM driver ICs are recommended over direct LF412CP use.
Is the LF412CP pin-compatible with other dual JFET op-amps like the TL072 or CA3140?
No, the LF412CP is not pin-compatible with TL072 or CA3140. While all are 8-pin dual op-amps, their pinouts differ: LF412CP places VCC− on pin 4 and VCC+ on pin 5, whereas TL072 and CA3140 assign VCC+ to pin 8 and VCC− to pin 4. Swapping them without PCB modification will cause incorrect biasing and potential damage. Always verify pin mapping using official TI documentation before substitution.
LF412CP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LF412CP FAQ
1.How can I place an order for LF412CP through Aetrix?
Please submit a Request for Quotation (RFQ) for LF412CP 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 LF412CP reliable?
The price and inventory of LF412CP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF412CP is usually 5 days.
3.What payment methods are accepted for LF412CP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF412CP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF412CP?
LF412CP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF412CP 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 LF412CP?
For technical support, including LF412CP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF412CP requirements.
6.How does Aetrix verify that LF412CP is sourced from the original manufacturer or authorized distributors?
All LF412CP 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 LF412CP meets industry standards.
7.What is the process for return or replacement of LF412CP?
All LF412CP units undergo pre-shipment inspection (PSI). If there is an issue with LF412CP, 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 LF412CP part is unused and in its original packaging.
Return procedure for LF412CP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF412CP Tags
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