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Texas Instruments LF347M
- Part No.:
- LF347M
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF347M.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,180
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Product details
Overview
LF347M from Texas Instruments is a quad JFET-input operational amplifier optimized for high-speed, low-input-bias-current applications including precision integrators, sample-and-hold circuits, and D/A converter buffers. It delivers 4 MHz gain-bandwidth, 13 V/μs slew rate, 5 mV max input offset voltage, and 50 pA typical input bias current across the 0°C to 70°C commercial temperature range.
For engineers reviewing the LF347M datasheet, LF347M pinout, LF347M application, or LF347M equivalent, this page provides verified technical context, SOIC-14 package details, real-world use cases in signal conditioning and analog computing, and validated alternative options for design continuity and sourcing flexibility.
Technical Context
The LF347M implements BI-FET II™ technology with matched high-voltage JFET input stages, enabling ultra-low input bias current (50 pA typ) and high input impedance (10¹² Ω) without external trimming. Its internally trimmed offset voltage ensures ≤5 mV max at 25°C, with 10 μV/°C average drift over temperature.
It operates from ±15 V supplies with 7.2 mA total supply current, supports rail-to-rail output swing of ±12 V into 10 kΩ, and maintains stable performance up to 4 MHz GBW and 13 V/μs slew rate-critical for fast-settling (<2 μs to 0.01%) analog signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 4 MHz - enables stable unity-gain operation up to 4 MHz or closed-loop gain × bandwidth tradeoffs for precision filtering and amplification. |
| Slew Rate | 13 V/μs - supports fast transient response in DAC output buffering and pulse amplification without distortion. |
| Input Offset Voltage | ≤5 mV max at 25°C - reduces DC error in precision integrators and sensor front-ends without manual nulling. |
| Input Bias Current | 50 pA typical - minimizes voltage error across high-impedance sources (e.g., photodiode, piezoelectric sensors). |
| Supply Current (total) | 7.2 mA - balances speed and power efficiency for multi-channel analog systems on shared ±15 V rails. |
| Common-Mode Input Range | ±11 V (vs. ±15 V supply) - allows operation with inputs near supply rails while retaining linearity and CMRR ≥70 dB. |
| Output Voltage Swing | ±12 V into 10 kΩ - delivers full dynamic range for 20 Vpp signals in test equipment and audio line drivers. |
Pinout & Package
LF347M is housed in a 14-pin SOIC (D) package per JEDEC MS-012 variation AB, 3.9 mm body width, 1.75 mm max height, with gull-wing leads and SN (matte tin) lead finish. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC quadrant Q1 tape feed direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | Inverting Input (−) per op-amp | Accepts differential input signals; high-impedance JFET node enables direct connection to high-Z sources. |
| 2, 6, 10, 14 | Non-Inverting Input (+) per op-amp | Provides reference point for follower or non-inverting gain configurations; common-mode range extends to ±11 V. |
| 3, 7, 11, 12 | Output per op-amp | Delivers ±12 V swing into 10 kΩ; capable of driving 2 kΩ loads to ±10 V over full temperature range. |
| 4 | Negative Supply (V−) | Connects to −15 V rail; exceeding negative common-mode limit forces output high-requires strict supply sequencing. |
| 11 | Positive Supply (V+) | Connects to +15 V rail; gain-bandwidth and slew rate degrade if common-mode input approaches V+. |
Key Features
| Feature | Design Value |
|---|---|
| Internally trimmed offset voltage | ≤5 mV max eliminates need for external nulling circuitry in production-grade instrumentation designs. |
| JFET input stage | 50 pA typical input bias current enables accurate integration of nanoamp-level currents in long-time-constant circuits. |
| Low 1/f noise corner | 50 Hz supports stable DC-coupled operation in precision measurement without low-frequency drift artifacts. |
| Fast settling time | 2 μs to 0.01% ensures fidelity in multiplexed data acquisition and switched-capacitor applications. |
| High CMRR & PSRR | ≥70 dB common-mode and supply rejection suppresses noise coupling in noisy industrial environments. |
Applications
| High-Speed Data Acquisition | Precision Sensor Signal Conditioning |
|---|---|
Use Scenario: Multiplexed analog input channel with fast-settling sample-and-hold before ADC conversion. IC Role / Device Role / Timing Role: Buffer and drive hold capacitor; quad configuration supports four parallel channels. Use Value: 2 μs settling to 0.01% and 13 V/μs slew rate minimize acquisition dead time and maintain signal integrity at >100 kSPS rates. |
Use Scenario: Amplifying low-level outputs from strain gauges or thermopiles with minimal added error. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end stage; JFET inputs prevent loading of high-impedance bridges. Use Value: 50 pA input bias current avoids millivolt-level offset errors across 10 kΩ bridge arms; 5 mV max VOS simplifies calibration. |
| Digital Attenuator Control | Analog Computing & Integration |
Use Scenario: Digitally selectable resistor network with op-amp-based summing and attenuation. IC Role / Device Role / Timing Role: Precision inverting amplifier per stage; quad layout matches 3-bit binary-weighted control logic. Use Value: 4 MHz GBW and low THD (<0.02%) preserve amplitude accuracy across 7 dB attenuation steps without phase lag. |
Use Scenario: Long-time-constant integrator for analog computing or ramp generation with reset/halt capability. IC Role / Device Role / Timing Role: Integrator core with JFET input minimizing leakage-induced drift over seconds-to-minutes intervals. Use Value: 50 pA bias current limits integration error to <1 mV/s drift; low 1/f noise corner (50 Hz) ensures stability below 1 Hz. |
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 |
|---|---|---|---|
| TL084CDR | Higher input bias current (30 pA typ vs. 50 pA), lower GBW (3 MHz), same SOIC-14 package. | Less suitable for ultra-high-Z sources but offers lower cost and wider temp range (−40°C to 85°C). | Select TL084CDR when budget constraints outweigh need for lowest bias current or highest slew rate. |
| OPA4134UA | FET-input, lower noise (8 nV/√Hz), higher precision (0.5 mV VOS max), but higher supply current (4 mA per amp) and no internal offset trim. | Better for audio and low-noise instrumentation; requires external nulling for sub-mV DC accuracy. | Choose OPA4134UA when 0.0005% THD and 100 dB CMRR are critical, and board space allows for trim components. |
Compared with TL084CDR and OPA4134UA, the LF347M uniquely balances low input bias current, internal offset trim, and 4 MHz bandwidth in a cost-effective SOIC-14 package-making it optimal for production-grade industrial signal chains where reliability, consistency, and ease of use are prioritized over ultra-low noise or extended temperature operation.
Availability
LF347M is available at Aetrix Electronics and suitable for high-speed data acquisition, precision sensor interfaces, digitally controlled analog attenuators, and analog computing circuits requiring stable component supply across industrial and test equipment programs.
Supply support for LF347M 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, scalability, and broad application support.
The LF347M belongs to TI's legacy BI-FET II™ op-amp family, engineered specifically for high-speed, low-input-current analog signal conditioning in industrial instrumentation, test equipment, and process control systems.
FAQ
What is the maximum operating supply voltage for the LF347M?
The LF347M supports a maximum supply voltage of ±18 V, as specified in its Absolute Maximum Ratings. Operation at ±15 V is recommended for guaranteed performance across all parameters-including 4 MHz gain-bandwidth, 13 V/μs slew rate, and ±12 V output swing into 10 kΩ. Exceeding ±18 V risks permanent damage to the LF347M.
Does the LF347M require external offset nulling components?
No, the LF347M does not require external offset nulling components. It features internal trimming of input offset voltage, guaranteeing ≤5 mV maximum at 25°C and ≤13 mV over the full 0°C to 70°C operating range. This eliminates the need for potentiometers or external compensation networks in most precision applications.
Is the LF347M pin-compatible with the LM148 or LF347N?
Yes, the LF347M is pin-compatible with the LM148 and LF347N in SOIC-14 and PDIP-14 packages respectively. All share identical 14-pin dual-in-line functional pinout (V−, Out A, In− A, In+ A, V+, Out B, In− B, In+ B, Out C, In− C, In+ C, Out D, In− D, In+ D). However, electrical specs differ-LF347M uses SOIC packaging and is rated for 0°C to 70°C only.
What is the thermal resistance (θJA) of the LF347M in SOIC package?
The LF347M in SOIC (D) package has a junction-to-ambient thermal resistance (θJA) of 100°C/W, as documented in the Absolute Maximum Ratings table. This value assumes standard PCB layout with minimal copper pour; adding thermal vias and ground-plane copper can reduce effective θJA and improve sustained output drive capability.
Can the LF347M drive capacitive loads directly?
The LF347M is not unity-gain stable with heavy capacitive loads. Driving >100 pF directly may cause peaking or oscillation due to phase margin degradation. For capacitive loads above 50 pF, TI recommends isolating the output with a small series resistor (e.g., 22–100 Ω) or using feedback compensation techniques described in the APPLICATION HINTS section of the LF347M datasheet.
LF347M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 13V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 7.2mA (x4 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LF347M FAQ
1.How can I place an order for LF347M through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347M 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 LF347M reliable?
The price and inventory of LF347M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347M is usually 5 days.
3.What payment methods are accepted for LF347M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347M?
LF347M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347M 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 LF347M?
For technical support, including LF347M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347M requirements.
6.How does Aetrix verify that LF347M is sourced from the original manufacturer or authorized distributors?
All LF347M 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 LF347M meets industry standards.
7.What is the process for return or replacement of LF347M?
All LF347M units undergo pre-shipment inspection (PSI). If there is an issue with LF347M, 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 LF347M part is unused and in its original packaging.
Return procedure for LF347M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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