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STMicroelectronics LF351DT
- Part No.:
- LF351DT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF351DT.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:14,020
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Product details
Overview
LF351DT from STMicroelectronics is a wide-bandwidth JFET-input operational amplifier in SO-8 package, featuring 16 V/µs slew rate, ±15 V input voltage range, 2.5 MHz gain-bandwidth product, and 10¹² Ω input resistance. It serves as a precision signal conditioning amplifier in analog front-ends for test equipment, sensor interfaces, and active filter circuits.
For engineers reviewing the LF351DT datasheet, LF351DT pinout, LF351DT application, or LF351DT equivalent, key selection criteria include input offset drift (10 µV/°C), output short-circuit protection, internal frequency compensation, and operation over 0°C to +70°C with ±15 V supply.
Technical Context
The LF351DT uses a monolithic JFET-bipolar hybrid process enabling high input impedance and low input bias current (20–200 pA). Its internal frequency compensation ensures unity-gain stability without external components.
It supports rail-to-rail common-mode input range up to VCC+ and delivers ±12 V output swing into 2 kΩ load. The device includes dual offset null pins (1 and 5) for precise DC calibration and features latch-up free operation under transient stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 16 V/µs typical - enables faithful reproduction of fast-rising signals up to ~1 MHz at unity gain |
| Gain-Bandwidth Product | 2.5 MHz typical - sets maximum stable closed-loop bandwidth for gain ≥ 1 configurations |
| Input Bias Current | 20–200 pA - minimizes error in high-impedance transducer interfaces (e.g., piezoelectric sensors) |
| Input Offset Voltage | 3–13 mV - adjustable via external potentiometer on pins 1 and 5 for sub-mV DC accuracy |
| Common-Mode Range | ±11 V to +15 V - allows direct interfacing with single-supply or split-supply signal sources |
| Output Short-Circuit Duration | Infinite - permits robust operation in fault-prone industrial signal paths without shutdown |
| Supply Voltage Range | ±6 V to ±18 V - supports flexible power architecture in mixed-signal systems |
Pinout & Package
LF351DT is housed in an SO-8 (Small Outline, 8-pin) plastic micro package compliant with ECOPACK® environmental standards and JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null 1 | Connects to one end of external 10 kΩ potentiometer for fine-tuning input offset voltage |
| 2 | Inverting Input | Primary negative feedback node; accepts inverted-phase signal or feedback network |
| 3 | Non-inverting Input | Positive input terminal; used for reference voltage sensing or non-inverting gain stages |
| 4 | VCC− | Negative supply rail connection; must be decoupled locally for noise immunity |
| 5 | Offset Null 2 | Connects to other end of same potentiometer as Pin 1 to balance input stage mismatch |
| 6 | Output | Amplified single-ended output; capable of ±12 V swing into 2 kΩ load |
| 7 | VCC+ | Positive supply rail connection; requires local 100 nF ceramic decoupling |
| 8 | N.C. | No internal connection - left unconnected; not usable for grounding or routing |
Key Features
| Feature | Design Value |
|---|---|
| High Input Impedance | 10¹² Ω - preserves signal integrity in high-Z sensor and photodiode amplifiers |
| Internal Frequency Compensation | Unity-gain stable - eliminates need for external compensation capacitors in most configurations |
| Output Short-Circuit Protection | Continuous safe operation - avoids thermal runaway during accidental load faults |
| Low Input Offset Drift | 10 µV/°C - maintains DC accuracy across ambient temperature variations in lab-grade instruments |
| JFET Input Stage | Low bias current (20–200 pA) - reduces voltage error across feedback resistors >1 MΩ |
Applications
| Test & Measurement Instrumentation | Active Filter Design |
|---|---|
Use Scenario: Precision DC-coupled voltage amplification in digital multimeters and oscilloscope front-ends. IC Role / Device Role / Timing Role: Signal conditioning amplifier with adjustable offset and high CMRR (>70 dB). Use Value: Enables sub-mV measurement resolution through offset nulling and low drift over 0–70°C. | Use Scenario: Second-order Sallen-Key and state-variable filter topologies requiring low-noise, high-slew-rate gain blocks. IC Role / Device Role / Timing Role: Unity-gain stable op-amp providing accurate pole placement and minimal phase distortion. Use Value: 2.5 MHz GBW and 16 V/µs slew rate support filter cutoffs up to 200 kHz with low THD (0.01%). |
| Sensor Signal Conditioning | Waveform Generation |
Use Scenario: Amplifying low-level outputs from thermocouples, strain gauges, and piezoelectric transducers. IC Role / Device Role / Timing Role: High-Z buffer and programmable-gain stage with low input current to avoid loading effects. Use Value: 10¹² Ω input resistance and 20–200 pA bias current prevent signal attenuation in >10 MΩ source impedances. | Use Scenario: Square wave and sine wave oscillators (e.g., Wien bridge, phase-shift) requiring stable amplitude and low distortion. IC Role / Device Role / Timing Role: Gain element in positive/negative feedback loops with precise loop gain control. Use Value: Internal compensation and 45° phase margin ensure reliable startup and sustained oscillation without ringing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar JFET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L1CDR | Lower supply current (1.4 mA vs. 3.4 mA), lower slew rate (0.05 V/µs), rail-to-rail output | Better suited for battery-powered low-speed precision apps; unsuitable for >10 kHz signal paths | Select when ultra-low power dominates over speed and AC performance |
| TL071CP | Higher slew rate (13 V/µs), identical SO-8 package, no offset null pins | Lacks external offset trimming capability; requires higher-precision resistors for DC-critical designs | Select when offset adjustment is unnecessary and cost sensitivity favors TI's broad distribution |
Compared with TLC27L1CDR and TL071CP, the LF351DT uniquely balances high slew rate, user-adjustable offset, and infinite short-circuit tolerance-making it optimal for industrial test gear where calibration flexibility and fault resilience are mandatory.
Availability
LF351DT is available at Aetrix Electronics and suitable for test instrumentation, active filtering, sensor signal conditioning, and waveform generation requiring stable component supply across production lifecycles.
Supply support for LF351DT 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The LF351DT belongs to ST's legacy JFET op-amp product line, engineered for high-fidelity analog signal processing in environments demanding low drift, high Zin, and robust fault handling.
FAQ
What is the maximum operating temperature for LF351DT?
The LF351DT is rated for 0°C to +70°C free-air operating temperature. This commercial-grade specification aligns with its intended use in benchtop instruments and non-military industrial systems. Exceeding +70°C risks increased input offset drift beyond 10 µV/°C and reduced output drive capability due to thermal derating of internal junctions.
Can LF351DT operate from a single supply?
Yes, LF351DT supports single-supply operation (e.g., +12 V and GND), but its input common-mode range extends only to VCC− + 12 V and does not include ground. For true rail-to-rail input, a level-shifting network or biasing circuit is required. Output swing remains asymmetric unless VCC− is referenced below ground.
Why does LF351DT have two offset null pins?
Pins 1 and 5 form a differential nulling interface for a three-terminal potentiometer. This configuration allows precise cancellation of input stage transistor mismatches by injecting opposing correction currents-enabling sub-millivolt DC accuracy unattainable with single-pin trimming schemes used in older op-amps.
Is LF351DT RoHS-compliant and lead-free?
Yes, LF351DT is supplied in an ECOPACK®-compliant SO-8 package with lead-free second-level interconnects, meeting RoHS Directive 2011/65/EU. The inner box label and package marking confirm compliance per JEDEC JESD97, and soldering profiles follow industry-standard Pb-free reflow guidelines.
LF351DT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- 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
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 6 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LF351DT FAQ
1.How can I place an order for LF351DT through Aetrix?
Please submit a Request for Quotation (RFQ) for LF351DT 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 LF351DT reliable?
The price and inventory of LF351DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF351DT is usually 5 days.
3.What payment methods are accepted for LF351DT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF351DT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF351DT?
LF351DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF351DT 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 LF351DT?
For technical support, including LF351DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF351DT requirements.
6.How does Aetrix verify that LF351DT is sourced from the original manufacturer or authorized distributors?
All LF351DT 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 LF351DT meets industry standards.
7.What is the process for return or replacement of LF351DT?
All LF351DT units undergo pre-shipment inspection (PSI). If there is an issue with LF351DT, 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 LF351DT part is unused and in its original packaging.
Return procedure for LF351DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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