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STMicroelectronics LF247DT
- Part No.:
- LF247DT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF247DT.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:14,925
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Product details
Overview
LF247DT from STMicroelectronics is a quad JFET-input operational amplifier with high slew rate (16 V/µs typ), low input bias current (20 pA typ), and wide common-mode input range (±11 V to +15 V). It operates from ±15 V supplies, delivers ±12 V output swing into 2 kΩ, and is rated for industrial temperature range (–40°C to +105°C) in SO-14 package. It is used in precision instrumentation amplifiers and audio distribution circuits.
For engineers reviewing the LF247DT datasheet, LF247DT pinout, LF247DT application, or LF247DT equivalent, key selection criteria include input offset voltage drift (10 µV/°C), channel separation (120 dB), supply voltage rejection ratio (80 dB), and unity-gain stable operation with internal frequency compensation.
Technical Context
The LF247DT integrates four matched JFET-input op-amps on a single monolithic die, combining high-voltage JFETs for ultra-low input bias current and bipolar transistors for robust output drive. Its architecture supports rail-to-rail-compatible common-mode input (up to VCC+) and features latch-up free operation under transient stress.
Each amplifier provides unity-gain stability without external compensation, exhibits 4 MHz gain-bandwidth product, and maintains 45° phase margin at unity gain with 100 pF capacitive load. The device's 10¹² Ω input resistance and 15 nV/√Hz input noise enable high-impedance sensor interfacing and low-distortion signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±15 V - Supports dual-rail analog systems with headroom for ±12 V output swing into 2 kΩ. |
| Slew Rate | 16 V/µs (typ) - Enables faithful reproduction of fast-rising signals up to ~1 MHz at full scale. |
| Input Bias Current | 20 pA (typ) - Minimizes DC error in high-impedance feedback networks (e.g., >1 MΩ gain-setting resistors). |
| Input Offset Voltage Drift | 10 µV/°C - Ensures <130 µV total offset shift across –40°C to +105°C operating range. |
| Common-Mode Input Range | –12 V to +15 V - Accepts inputs beyond negative rail, enabling single-supply-like flexibility in dual-rail designs. |
| Channel Separation | 120 dB - Prevents crosstalk between adjacent amplifiers in multi-channel active filters or mixer stages. |
| Gain-Bandwidth Product | 4 MHz - Supports closed-loop gains up to 40 at 100 kHz while maintaining phase margin. |
Pinout & Package
LF247DT is housed in a 14-pin plastic small-outline (SO-14) package with standard JEDEC MO-153 footprint, 1.27 mm pitch, and gull-wing leads. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp 1) | High-impedance JFET node; connects to feedback network in inverting configurations. |
| 2 | Non-inverting Input (Amp 1) | High-impedance JFET node; referenced to ground or bias network in non-inverting applications. |
| 3 | Output (Amp 1) | Class-AB output stage capable of ±60 mA short-circuit current and ±12 V swing into 2 kΩ. |
| 4 | VCC– (Negative Supply) | Return path for all four amplifiers' internal bias and output stages; must be low-impedance. |
| 5 | Inverting Input (Amp 2) | Independent high-Z input; electrically isolated from Amp 1 per datasheet channel separation spec. |
| 6 | Non-inverting Input (Amp 2) | Matches Amp 1 input characteristics; usable for differential pair or parallel gain stages. |
| 7 | Output (Amp 2) | Identical output capability to Pin 3; supports independent loading without interaction (120 dB isolation). |
| 8 | Output (Amp 3) | Third independent output; enables triple-channel functions like RGB video buffering or 3-phase signal conditioning. |
| 9 | Inverting Input (Amp 3) | Same JFET input structure as Pins 1 and 5; matched offset and bias for multi-amp topologies. |
| 10 | Non-inverting Input (Amp 3) | Provides third high-Z input; used in cascaded filters or summing junctions with low interaction. |
| 11 | VCC+ (Positive Supply) | Power rail for all amplifiers; requires local 100 nF ceramic decoupling near Pin 11 and Pin 4. |
| 12 | Inverting Input (Amp 4) | Fourth matched input; enables full quad functionality such as 4-channel audio line drivers. |
| 13 | Non-inverting Input (Amp 4) | Completes quad set; supports independent configuration (e.g., one amp as reference buffer, others as signal paths). |
| 14 | Output (Amp 4) | Final output; verified to meet same AC/DC specs as other outputs under identical load conditions. |
Key Features
| Feature | Design Value |
|---|---|
| JFET input stage | Enables 20 pA typical input bias current and 10¹² Ω input resistance for photodiode or piezo sensor interfaces. |
| Internal frequency compensation | Guarantees unity-gain stability without external components, reducing BOM count in voltage-follower applications. |
| Output short-circuit protection | Allows indefinite shorting to either supply rail or ground without damage, simplifying fault-tolerant design. |
| Latch-up free operation | Prevents destructive parasitic thyristor activation during overvoltage transients on inputs or supplies. |
| Wide common-mode range (to VCC+) | Permits direct connection of non-inverting inputs to positive supply rails in level-shifting or clamp circuits. |
Applications
| Audio Distribution Amplifier | Precision Instrumentation Amplifier |
|---|---|
Use Scenario: Distributing a single line-level audio source to four independent recording or monitoring paths with minimal crosstalk. IC Role / Device Role / Timing Role: Quad op-amp configured as unity-gain buffers, each driving a separate 10 kΩ load with <0.01% THD. Use Value: 120 dB channel separation prevents audible leakage between outputs; 16 V/µs slew rate preserves transient fidelity up to 20 kHz. | Use Scenario: Building a 3-op-amp instrumentation amplifier front-end for strain gauge or thermocouple measurement. IC Role / Device Role / Timing Role: Two amps serve as matched input buffers; third provides adjustable gain; fourth acts as reference buffer or filter stage. Use Value: Matched input bias (20 pA typ) and offset drift (10 µV/°C) minimize common-mode error; 80 dB SVR rejects power supply ripple. |
| Active Bandpass Filter Bank | High-Impedance Sensor Interface |
Use Scenario: Implementing cascaded second-order bandpass filters for 100 kHz signal extraction in RF receiver IF stages. IC Role / Device Role / Timing Role: Four independent amplifiers configured in positive-feedback topology to realize Q = 69, fo = 100 kHz response. Use Value: 4 MHz GBP and 45° phase margin ensure stable resonance without peaking; low input capacitance avoids Q degradation. | Use Scenario: Conditioning output from a 1 GΩ pH electrode or MEMS microphone preamplifier requiring ultra-low input current. IC Role / Device Role / Timing Role: First-stage buffer with guard ring layout and Teflon PCB routing to preserve 10¹² Ω input impedance. Use Value: 20 pA input bias current prevents electrode polarization; 15 nV/√Hz noise ensures >80 dB SNR at 1 kHz. |
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 |
|---|---|---|---|
| TLC27L4CDR | Lower supply current (1.4 µA vs. 2.7 mA per amp); lower slew rate (0.065 V/µs); narrower temp range (0°C to +70°C). | Optimized for battery-powered, low-speed sensing-not suitable for audio or active filtering. | Select when ultra-low power dominates over speed and temperature range. |
| TL074CDR | Higher slew rate (13 V/µs); higher input bias (30 pA); same SO-14 package and pinout; no output short-circuit protection. | Widely used in audio but lacks built-in short-circuit hardening for industrial I/O protection. | Select when cost and legacy design compatibility outweigh need for fault tolerance. |
Compared with TLC27L4CDR and TL074CDR, LF247DT uniquely combines industrial temperature rating, output short-circuit protection, and 16 V/µs slew rate-making it optimal for ruggedized test equipment and factory automation signal conditioning where reliability and dynamic performance are jointly critical.
Availability
LF247DT is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor signal chains, and audio distribution systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LF247DT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The LFx47 series was developed specifically for high-fidelity analog signal processing in harsh environments, emphasizing JFET input integrity, thermal stability, and robustness against ESD and supply transients.
FAQ
What is the maximum safe supply voltage for LF247DT?
The absolute maximum supply voltage is ±18 V per the datasheet. Operation at ±15 V is recommended for full specification compliance, including output swing, slew rate, and distortion. Exceeding ±15 V may degrade long-term reliability and is not guaranteed to maintain 120 dB channel separation or 10 µV/°C drift performance.
Does LF247DT require external compensation capacitors?
No. LF247DT includes internal frequency compensation optimized for unity-gain stability. Adding external compensation is unnecessary and may degrade phase margin or bandwidth. The device is characterized for stable operation with 100 pF capacitive loads at unity gain, as confirmed in the datasheet's pulse response and phase margin plots.
Can LF247DT drive a 600 Ω audio load directly?
No. LF247DT is not specified for 600 Ω loads. Its output swing drops to ±8 V into 600 Ω (per typical curves), and THD exceeds 1% above 1 kHz. For professional audio line driving, use a dedicated output buffer stage or select a driver-rated op-amp like the NE5532. LF247DT is validated for ≥2 kΩ loads.
Is the LF247DT pinout compatible with the TL074?
Yes. LF247DT and TL074 share identical SO-14 pin assignments: Pin 1 = In− (Amp 1), Pin 2 = In+ (Amp 1), Pin 3 = Out (Amp 1), Pin 4 = V−, etc. However, electrical differences-including input bias current (20 pA vs. 30 pA), slew rate (16 vs. 13 V/µs), and short-circuit protection-require validation in the target circuit before substitution.
LF247DT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 16V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 pA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 1.4mA (x4 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 44 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LF247DT FAQ
1.How can I place an order for LF247DT through Aetrix?
Please submit a Request for Quotation (RFQ) for LF247DT 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 LF247DT reliable?
The price and inventory of LF247DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF247DT is usually 5 days.
3.What payment methods are accepted for LF247DT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF247DT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF247DT?
LF247DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF247DT 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 LF247DT?
For technical support, including LF247DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF247DT requirements.
6.How does Aetrix verify that LF247DT is sourced from the original manufacturer or authorized distributors?
All LF247DT 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 LF247DT meets industry standards.
7.What is the process for return or replacement of LF247DT?
All LF247DT units undergo pre-shipment inspection (PSI). If there is an issue with LF247DT, 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 LF247DT part is unused and in its original packaging.
Return procedure for LF247DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF247DT Tags
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LM358DT
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