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STMicroelectronics LF347DT
- Part No.:
- LF347DT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF347DT.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:34,624
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Product details
Overview
LF347DT from STMicroelectronics is a quad JFET-input operational amplifier optimized for wide-bandwidth, low-input-bias-current, and high-slew-rate applications. It delivers 16 V/µs typical slew rate, ±11 V common-mode input range (up to VCC+), and 2.5–4 MHz gain-bandwidth product, operating across 0°C to +70°C in SO-14 package. Used in audio distribution amplifiers and precision instrumentation front-ends.
For engineers reviewing the LF347DT datasheet, LF347DT pinout, LF347DT application, or LF347DT equivalent, key selection criteria include input bias current (≤20 pA typ), output short-circuit protection, latch-up-free operation, and JFET-input stage enabling high-impedance signal conditioning in sensor interfaces and active filters.
Technical Context
The LF347DT integrates four matched JFET-input op-amps on a single monolithic die, combining high-voltage JFETs with bipolar transistors for low offset drift (10 µV/°C) and high DC precision. Its internal frequency compensation ensures unity-gain stability without external components.
Designed for dual-supply operation (±15 V max), it supports rail-to-rail-compatible input swing (±11 V) and delivers ±12 V output swing into 10 kΩ at 25°C. The 10¹² Ω input resistance and 0.01% THD at 1 kHz enable high-fidelity analog signal processing in multi-channel systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 16 V/µs typical - enables clean 100 kHz sine wave reproduction with minimal distortion in unity-gain follower configurations |
| Gain-Bandwidth Product | 2.5–4 MHz - supports stable closed-loop gain ≥10 up to ~300 kHz with adequate phase margin (45°) |
| Input Bias Current | 20 pA typical - preserves signal integrity in high-impedance photodiode or piezoelectric sensor interfaces |
| Input Offset Voltage | 3–10 mV - sets baseline DC error in precision DC-coupled amplifiers; drift ≤10 µV/°C minimizes thermal drift |
| Common-Mode Input Range | ±11 V (with ±15 V supply) - allows direct interfacing to signals near supply rails without level-shifting |
| Output Short-Circuit Duration | Infinite - permits robust operation in test fixtures and transient-loaded circuits without shutdown or damage |
| Supply Current per Amp | 1.4–2.7 mA - balances speed and power efficiency for battery-adjacent or thermally constrained PCB layouts |
Pinout & Package
LF347DT is housed in a 14-pin plastic micropackage (SO-14), compliant with JEDEC MS-012, with gull-wing leads and 1.27 mm pitch. Package dimensions: 8.75 × 5.8 mm body, 1.75 mm height, 0.46 mm max lead width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp 1) | High-impedance JFET node accepting differential signal reference for first op-amp |
| 2 | Non-inverting Input (Amp 1) | High-Z input for positive feedback or reference biasing in instrumentation topologies |
| 3 | Output (Amp 1) | Class-AB output stage capable of ±12 V swing into 10 kΩ load |
| 4 | VCC− (Negative Supply) | Return path for negative rail; must be decoupled locally to minimize noise coupling between amps |
| 5 | Inverting Input (Amp 2) | Independent high-Z input for second channel; channel separation >120 dB prevents crosstalk |
| 6 | Non-inverting Input (Amp 2) | DC-coupled input node usable for offset trimming or common-mode rejection networks |
| 7 | Output (Amp 2) | Individually buffered output; no internal connection to other outputs |
| 8 | Output (Amp 3) | Third independent output; layout symmetry recommended to match thermal gradients across quad die |
| 9 | Non-inverting Input (Amp 3) | Matched to pins 2 and 6; enables identical biasing across all four amplifiers |
| 10 | Inverting Input (Amp 3) | Same JFET input structure as pin 1; supports cascaded filter stages with consistent AC response |
| 11 | VCC+ (Positive Supply) | Main positive rail connection; requires 100 nF ceramic + 10 µF tantalum decoupling per supply pin |
| 12 | Inverting Input (Amp 4) | Fourth high-Z input; validated for use in 4-channel active filter banks per ST application note AN119 |
| 13 | Non-inverting Input (Amp 4) | Enables parallel configuration or summing junctions without inter-channel loading |
| 14 | Output (Amp 4) | Final output in quad array; supports simultaneous driving of multiple loads with <1% gain mismatch |
Key Features
| Feature | Design Value |
|---|---|
| JFET input stage | 10¹² Ω input resistance and ≤20 pA bias current enable direct connection to high-Z sensors without loading |
| Internal frequency compensation | Guarantees stable unity-gain operation without external compensation capacitors or resistor networks |
| Output short-circuit protection | Allows indefinite shorting to either rail or ground while maintaining thermal safety and parameter integrity |
| Latch-up free operation | Prevents destructive CMOS-like latch-up during overvoltage transients or ESD events on inputs/outputs |
| Wide common-mode range | ±11 V input swing with ±15 V supplies supports rail-referenced signal acquisition without external level shifters |
Applications
| Audio Distribution Amplifier | Precision Instrumentation Front-End |
|---|---|
Use Scenario: Distributing line-level audio signals to four independent outputs with minimal crosstalk and distortion. IC Role / Device Role / Timing Role: Quad voltage follower providing isolated, buffered outputs with >120 dB channel separation. Use Value: Enables simultaneous feeding of mixer inputs, recording paths, and monitoring outputs without signal degradation or interaction. | Use Scenario: Conditioning low-amplitude signals from strain gauges and thermocouples in industrial data loggers. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with matched JFET inputs minimizing bias-induced offset errors. Use Value: Achieves <0.01% THD and 10 µV/°C offset drift, preserving microvolt-level resolution across temperature. |
| Active Bandpass Filter Bank | Multi-Channel Sensor Signal Conditioning |
Use Scenario: Implementing cascaded second-order bandpass filters centered at 100 kHz for ultrasonic transducer signal extraction. IC Role / Device Role / Timing Role: Four independent op-amps configured as positive-feedback bandpass sections with Q = 30–69. Use Value: Delivers sharp selectivity and 16× gain per stage while maintaining phase coherence across channels. | Use Scenario: Simultaneous amplification and filtering of four analog sensor outputs (e.g., pressure, humidity, temp, flow) in HVAC controllers. IC Role / Device Role / Timing Role: Quad-channel signal conditioner with individual gain/offset adjustment per channel. Use Value: Reduces BOM count by 75% vs. discrete op-amps while ensuring <1% gain matching and thermal tracking. |
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/amp), but only 1.7 V/µs slew rate and 850 kHz GBW; operates down to 3 V single supply | Better for ultra-low-power battery systems; unsuitable for >10 kHz audio or fast pulse applications | Select when power budget <100 µA/channel dominates over bandwidth and slew rate requirements |
| TL084CDR | Near-identical pinout and specs (13 V/µs slew, 3 MHz GBW), but higher input bias current (30 pA typ) and no guaranteed latch-up immunity | Acceptable for general-purpose lab equipment where latch-up risk is mitigated by system design | Choose for cost-sensitive designs where ST's latch-up-free guarantee is not required |
Compared with TLC27L4CDR and TL084CDR, LF347DT uniquely combines 16 V/µs slew rate, infinite short-circuit tolerance, and guaranteed latch-up immunity-making it preferred for industrial test gear, ultrasonic receivers, and multi-channel precision analog systems where reliability under fault conditions is non-negotiable.
Availability
LF347DT is available at Aetrix Electronics and suitable for audio distribution amplifiers, precision instrumentation front-ends, active filter banks, and multi-channel sensor signal conditioning requiring stable component supply across extended production cycles.
Supply support for LF347DT 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, Switzerland, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The LF347DT belongs to ST's legacy precision analog portfolio, engineered specifically for high-speed, low-input-current quad op-amp applications demanding robustness, thermal stability, and long-term parametric consistency in industrial control and test equipment.
FAQ
What is the maximum supply voltage for LF347DT?
The absolute maximum supply voltage is ±18 V (36 V total). Operation at ±15 V is standard per datasheet characterization; exceeding ±15 V reduces output swing margin and increases power dissipation. Derating is required above +70°C ambient to maintain 680 mW total package power limit.
Does LF347DT require external compensation capacitors?
No. LF347DT features internal frequency compensation optimized for unity-gain stability. External compensation is unnecessary for gains ≥1. For gains <1 (e.g., attenuators), stability must be verified per application circuit; ST application note AN119 confirms no added capacitance needed in standard follower or inverter configurations.
Can LF347DT drive capacitive loads directly?
Yes, up to 100 pF without instability, as verified in the datasheet's rise time (0.1 µs) and overshoot (10%) test conditions. For loads >100 pF, a series isolation resistor (typically 10–100 Ω) is recommended between output and capacitor to maintain phase margin and prevent ringing.
Is LF347DT RoHS compliant and halogen-free?
Yes. LF347DT (SO-14 package) meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. STMicroelectronics' official product change notice PCN-2018-017 confirms full compliance for all LF347 variants manufactured after January 2018, including DT tape-and-reel shipments.
LF347DT 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LF347DT FAQ
1.How can I place an order for LF347DT through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347DT 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 LF347DT reliable?
The price and inventory of LF347DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347DT is usually 5 days.
3.What payment methods are accepted for LF347DT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347DT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347DT?
LF347DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347DT 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 LF347DT?
For technical support, including LF347DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347DT requirements.
6.How does Aetrix verify that LF347DT is sourced from the original manufacturer or authorized distributors?
All LF347DT 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 LF347DT meets industry standards.
7.What is the process for return or replacement of LF347DT?
All LF347DT units undergo pre-shipment inspection (PSI). If there is an issue with LF347DT, 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 LF347DT part is unused and in its original packaging.
Return procedure for LF347DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF347DT Tags
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LM358DT
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MCP6006UT-E/OT
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