My Inquiry
My Account
Texas Instruments LF347BDR
- Part No.:
- LF347BDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF347BDR.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,873
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LF347BDR from Texas Instruments is a JFET-input quad operational amplifier optimized for high-speed, low-bias-current applications. It delivers 3 MHz gain bandwidth, 13 V/µs slew rate, and 50 pA typical input bias current across its four independent amplifiers, operating from ±3.5 V to ±18 V supplies over 0°C to 70°C. It is used in solar inverter signal conditioning, oscilloscope front-end amplification, and motor drive feedback loops.
For engineers reviewing the LF347BDR datasheet, LF347BDR pinout, LF347BDR application, or LF347BDR equivalent, key selection criteria include input bias current stability at elevated temperature, common-mode voltage range (VCC– + 4 V to VCC+ – 4 V), output short-circuit protection via 200-Ω series resistance, and SOIC-14 package compatibility with industrial PCB assembly standards.
Technical Context
The LF347BDR integrates four matched JFET-input stages with bipolar output drivers on a single monolithic die, enabling high input impedance (>10¹² Ω) while maintaining fast transient response. Its architecture supports dual-supply operation and permits rail-to-rail input common-mode range on the positive side but requires ≥4 V headroom from the negative rail.
Each amplifier features internal compensation for unity-gain stability, 80 dB minimum CMRR and PSRR, and thermal shutdown protection. The device is characterized for linear operation under load conditions up to 10 kΩ and exhibits ≤7 mV max input offset voltage across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 3 MHz - Enables stable closed-loop operation up to ~300 kHz with gain of 10. |
| Slew Rate | 13 V/µs - Supports clean amplification of fast-rising signals such as PWM edge detection or pulse shaping. |
| Input Bias Current | 50 pA typ - Allows use of >1 MΩ feedback resistors without significant DC error in precision integrators. |
| Input Offset Voltage | 5 mV max - Limits initial DC error in sensor interface circuits requiring <1% accuracy. |
| Supply Voltage Range | ±3.5 V to ±18 V - Compatible with standard industrial dual-rail supplies including ±5 V, ±12 V, and ±15 V systems. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial and industrial ambient environments, excluding extended-temperature automotive use. |
| Common-Mode Range | VCC– + 4 V to VCC+ – 4 V - Requires design margin on negative rail; not suitable for true single-supply rail-to-rail input. |
Pinout & Package
LF347BDR is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 3.91 mm with 1.27 mm lead pitch and 1.75 mm maximum height. The package is RoHS-compliant, NIPDAU-finished, and rated MSL Level-1 for unlimited reflow exposure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | Output (Amp 1–4) | Amplifier outputs with 200-Ω series resistance for short-circuit protection. |
| 2, 6, 9, 13 | Inverting Input (Amp 1–4) | JFET differential pair inputs; high-Z node sensitive to layout-induced leakage. |
| 3, 5, 10, 12 | Noninverting Input (Amp 1–4) | High-impedance inputs supporting common-mode voltages up to VCC+ – 4 V. |
| 4, 11 | VCC+, VCC– | Dual supply pins; require local 0.1 µF ceramic bypass capacitors per rail for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Low Input Bias Current | 50 pA typical enables high-resistance sensor interfaces and long-time-constant integrators without drift. |
| Fast Slew Rate | 13 V/µs ensures minimal distortion in audio and control-loop applications with dynamic signals. |
| High CMRR & PSRR | 80 dB minimum suppresses power supply ripple and common-mode interference in noisy industrial settings. |
| Internal Compensation | Unity-gain stable design eliminates need for external compensation components in most configurations. |
| Output Short-Circuit Protection | 200-Ω series resistance limits fault current and prevents latch-up during accidental shorts. |
Applications
| Solar Inverter Signal Conditioning | Oscilloscope Front-End Amplification |
|---|---|
Use Scenario: Amplifying isolated current-sense signals from shunt resistors in MPPT and DC-link monitoring circuits. IC Role / Device Role / Timing Role: Quad amplifier provides simultaneous gain, filtering, and level-shifting for four independent measurement channels. Use Value: Low input bias current prevents loading of high-impedance isolation amplifiers; 3 MHz bandwidth preserves fast transients during fault events. | Use Scenario: Buffering and amplifying probe signals before ADC sampling in 20–100 MHz analog front-ends. IC Role / Device Role / Timing Role: First-stage gain block with controlled bandwidth and low noise to preserve signal fidelity. Use Value: 13 V/µs slew rate supports accurate reproduction of 10–20 ns rise-time pulses; JFET input minimizes added noise floor. |
| Motor Drive Feedback Loop | Pro Audio Mixer Channel |
Use Scenario: Closed-loop current sensing and error amplification in AC inverter gate driver feedback paths. IC Role / Device Role / Timing Role: Error amplifier comparing sensed phase current to reference and driving PWM modulator input. Use Value: 80 dB CMRR rejects high-dv/dt switching noise from IGBTs; 0°C–70°C rating matches inverter enclosure thermal profile. | Use Scenario: Active filtering and summing in channel strip preamplifiers and equalizer sections. IC Role / Device Role / Timing Role: Low-distortion op-amp for tone control, gain staging, and active crossover networks. Use Value: Low THD and 3 MHz GBW support wideband audio response up to 200 kHz; quad configuration reduces board space vs discrete solutions. |
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 |
|---|---|---|---|
| TL074CDR | Higher input bias current (65 pA typ), lower slew rate (13 V/µs same), identical SOIC-14 package. | Lower cost; slightly higher input noise and reduced common-mode range (VCC– + 4 V only). | Acceptable where 50 pA bias current is not critical and supply rails remain within ±15 V. |
| OPA4134UA | Lower input bias current (1 pA typ), higher slew rate (20 V/µs), wider supply range (±2.5 V to ±18 V), same SOIC-14 footprint. | Premium audio and precision instrumentation; higher cost and tighter thermal specs (–40°C to 85°C). | Preferred when ultra-low bias current or extended temperature operation is required; pin-compatible drop-in replacement. |
Compared with TL074CDR, LF347BDR offers superior input bias current and CMRR for sensor interfaces; compared with OPA4134UA, it trades precision and speed for cost-effectiveness in commercial-grade industrial systems.
Availability
LF347BDR is available at Aetrix Electronics and suitable for solar inverters, motor drives, oscilloscope subsystems, and pro audio equipment requiring stable component supply across multi-year production cycles.
Supply support for LF347BDR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.
The LF347BDR belongs to TI's legacy JFET-input op-amp product line, designed specifically for cost-sensitive, high-speed industrial signal conditioning where low input bias current and robustness outweigh ultra-precision requirements.
FAQ
What is the maximum supply voltage for LF347BDR?
The LF347BDR supports dual-supply operation from ±3.5 V to ±18 V. Absolute maximum ratings specify ±18 V on VCC+ and VCC–; exceeding this risks permanent damage. For reliable long-term operation, TI recommends staying within ±15 V under typical conditions, especially when driving capacitive loads or operating near temperature extremes. The LF347BDR datasheet confirms these limits in Section 6.1 Absolute Maximum Ratings.
Does LF347BDR support single-supply operation?
Yes, LF347BDR can operate from a single supply, provided the input common-mode voltage remains within VCC– + 4 V to VCC+ – 4 V. Since VCC– is typically grounded in single-supply mode, the usable input range starts at +4 V - meaning it cannot accept signals near ground without level-shifting circuitry. This limitation is documented in Section 6.3 Recommended Operating Conditions and confirmed by the input stage architecture described in Section 8.1 Overview of the LF347BDR datasheet.
What is the input offset voltage specification for LF347BDR?
The LF347BDR has a maximum input offset voltage of 7 mV over the full 0°C to 70°C operating range, with a typical value of 5 mV at 25°C. This parameter is specified in Section 6.6 Electrical Characteristics: LF347B of the official TI datasheet (SLOS013C). The offset voltage drift is 18 µV/°C, making it suitable for applications where moderate DC accuracy is acceptable without trimming.
Is LF347BDR pin-compatible with LF347DR?
Yes, LF347BDR is fully pin-compatible with LF347DR. Both are 14-pin SOIC devices sharing identical pinout, package dimensions, and thermal characteristics. The primary difference lies in electrical performance: LF347BDR offers improved specifications including lower input offset voltage (5 mV max vs 10 mV max) and higher CMRR (80 dB min vs 70 dB min), as verified in Sections 6.5 and 6.6 of the LF347BDR datasheet.
What thermal metrics apply to LF347BDR in SOIC-14 package?
For the LF347BDR in SOIC-14 (D) package, junction-to-ambient thermal resistance (RθJA) is 74.4°C/W, junction-to-board (RθJB) is 28.9°C/W, and junction-to-case (top) (RθJC(top)) is 32.5°C/W. These values are measured per JEDEC standards and appear in Section 6.4 Thermal Information of the LF347BDR datasheet. They inform heatsinking requirements and maximum power dissipation under real-world PCB layouts.
LF347BDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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:
- 13V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 8mA (x4 Channels)
- Current - Output / Channel:
- 31 mA
- Voltage - Supply Span (Min):
- 7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LF347BDR FAQ
1.How can I place an order for LF347BDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347BDR 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 LF347BDR reliable?
The price and inventory of LF347BDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347BDR is usually 5 days.
3.What payment methods are accepted for LF347BDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347BDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347BDR?
LF347BDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347BDR 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 LF347BDR?
For technical support, including LF347BDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347BDR requirements.
6.How does Aetrix verify that LF347BDR is sourced from the original manufacturer or authorized distributors?
All LF347BDR 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 LF347BDR meets industry standards.
7.What is the process for return or replacement of LF347BDR?
All LF347BDR units undergo pre-shipment inspection (PSI). If there is an issue with LF347BDR, 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 LF347BDR part is unused and in its original packaging.
Return procedure for LF347BDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF347BDR Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
