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Texas Instruments LF356M/NOPB
- Part No.:
- LF356M/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF356M/NOPB.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
LF356M/NOPB from Texas Instruments is a JFET-input operational amplifier optimized for precision, high-speed analog signal conditioning in industrial and test equipment. It delivers 12 V/µs slew rate, 5 MHz gain bandwidth, 1.5 µs settling time to 0.01%, 30 pA input bias current, and 12 nV/√Hz input voltage noise at 1 kHz - enabling accurate amplification of low-level sensor signals in data acquisition systems.
For engineers reviewing the LF356M/NOPB datasheet, LF356M/NOPB pinout, LF356M/NOPB application, or LF356M/NOPB equivalent, key selection criteria include its BI-FET™ architecture for high input impedance (10¹² Ω), internal compensation for stability with capacitive loads up to 5000 pF, offset adjust capability without drift degradation, and operation across 0°C to +70°C ambient temperature range.
Technical Context
The LF356M/NOPB employs Texas Instruments' monolithic BI-FET™ process integrating matched high-voltage JFETs with bipolar transistors, enabling low 1/f noise corner and rugged input stage handling. Its differential input stage supports ±30 V differential voltage and common-mode input range extending to the positive supply rail plus ~100 mV.
Offset adjustment is implemented via external resistors on pins 1 and 5, preserving CMRR (≥80 dB) and open-loop gain (≥15 V/mV) without performance trade-offs. The output stage drives large capacitive loads (up to 5000 pF) stably due to internal frequency compensation and robust current sourcing/sinking capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 12 V/µs - enables faithful reproduction of fast-rising analog waveforms in active filters and DAC buffers |
| Gain Bandwidth Product | 5 MHz - supports stable closed-loop gain ≥10 at 500 kHz for wideband instrumentation |
| Settling Time (0.01%) | 1.5 µs - ensures rapid stabilization after step inputs in sample-and-hold and multiplexed ADC front-ends |
| Input Bias Current | 30 pA typical - minimizes voltage error in high-impedance transducer interfaces (e.g., piezoelectric sensors) |
| Input Voltage Noise | 12 nV/√Hz at 1 kHz - critical for low-noise amplification of microvolt-level signals from thermocouples or strain gauges |
| Common-Mode Rejection | 80–100 dB - maintains accuracy in single-supply configurations with ground-referenced inputs |
| Supply Voltage Range | ±15 V (recommended), up to ±18 V absolute max - compatible with standard bipolar lab power supplies |
Pinout & Package
LF356M/NOPB is supplied in an 8-pin SOIC package (4.90 mm × 3.91 mm body size), optimized for surface-mount assembly and thermal performance (RθJA = 55.2°C/W in still air).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5 | BALANCE | Offset null terminals - connect external potentiometer (10 kΩ) center wiper to V–, ends to pins 1 and 5 for precise VOS trimming |
| 2 | –INPUT | Inverting input - high-impedance JFET gate node; sensitive to layout-induced leakage and EMI |
| 3 | +INPUT | Noninverting input - same JFET structure as pin 2; used for unity-gain buffer or reference sensing |
| 4 | V– | Negative supply - must not be exceeded by either input voltage to prevent destructive current flow |
| 6 | OUTPUT | Class-AB output stage - capable of ±12 V swing into 2 kΩ load; stable with ≥5000 pF capacitive loads |
| 7 | V+ | Positive supply - common-mode input range extends to V+ +100 mV, enabling supply-rail referenced sensing |
| 8 | NC | No connection - electrically isolated; no PCB trace or pad required |
Key Features
| Feature | Design Value |
|---|---|
| BI-FET™ Input Stage | Monolithic integration of matched JFETs and bipolar transistors enables 10¹² Ω input resistance and <30 pA bias current without hybrid assembly |
| Offset Adjust Architecture | External nulling circuitry (pins 1/5) adjusts input offset without degrading drift (≤5 μV/°C) or CMRR (≥80 dB) |
| Capacitive Load Drive | Internally compensated output stage remains stable driving up to 5000 pF - eliminates need for isolation resistors in DAC output buffers |
| Wide Common-Mode Range | Inputs operate from V– to V+ +100 mV - supports direct monitoring of supply rails or high-side current sense without level-shifting |
| Rugged Input Protection | JFET gates withstand ±30 V differential input without clamps - simplifies front-end design for industrial I/O modules |
Applications
| Precision Data Acquisition Channel | High-Speed DAC Output Buffer |
|---|---|
Use Scenario: Amplifying low-amplitude, high-impedance outputs from RTDs, thermocouples, or photodiodes in automated test equipment. IC Role / Device Role / Timing Role: Low-noise, low-drift noninverting amplifier with offset trim for DC-coupled signal conditioning prior to 16-bit SAR ADC sampling. Use Value: 12 nV/√Hz noise and 30 pA bias current minimize added error; 1.5 µs settling ensures full-scale accuracy within one ADC conversion cycle at 1 MSPS. | Use Scenario: Driving the analog output of 12-bit voltage-mode DACs in programmable power supplies and waveform generators. IC Role / Device Role / Timing Role: Unity-gain buffer isolating DAC core from variable load capacitance while maintaining monotonicity and linearity. Use Value: Stable operation with ≥5000 pF loads prevents peaking or ringing; 12 V/µs slew rate supports ≤100 kHz full-scale transitions without distortion. |
| Logarithmic Converter Front-End | Supply Rail Monitor & Limiter |
Use Scenario: Converting wide-dynamic-range photocurrent (100 µA–1 mA) into linear voltage output for optical power measurement. IC Role / Device Role / Timing Role: Transimpedance amplifier with diode-connected feedback, leveraging JFET input for minimal input current error. Use Value: 30 pA input bias current ensures <0.1% error at 100 µA input; low 1/f corner enables stable DC log response over temperature. | Use Scenario: Monitoring +12 V or +24 V system rails for overvoltage protection and telemetry in industrial PLCs. IC Role / Device Role / Timing Role: High-side comparator reference amplifier, using V+ as common-mode reference point for rail-to-rail sensing. Use Value: Common-mode range to V+ +100 mV allows direct connection to supply rail; 100 dB PSRR rejects switching noise from adjacent DC/DC converters. |
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 |
|---|---|---|---|
| TLC27L2CP | Lower power (190 µA supply current), lower slew rate (0.05 V/µs), wider temp range (–55°C to +125°C), but higher input bias current (0.7 pA typical) | Better suited for battery-powered, low-speed precision sensors; unsuitable for >10 kHz signal paths | Select when ultra-low quiescent current outweighs speed requirements |
| TL072CP | Dual-channel, higher slew rate (13 V/µs), identical GBW (3 MHz), but higher input noise (18 nV/√Hz) and no offset adjust pins | Preferred for dual-path audio or dual-sensor conditioning where board space is constrained | Choose for cost-sensitive dual-op-amp layouts where offset trim is handled externally |
Compared with TLC27L2CP and TL072CP, the LF356M/NOPB uniquely combines offset adjust capability, 5 MHz bandwidth, and 1.5 µs settling in a single-channel SOIC package - making it optimal for high-fidelity, single-ended precision analog channels requiring factory calibration.
Availability
LF356M/NOPB is available at Aetrix Electronics and suitable for precision data acquisition, high-speed DAC buffering, logarithmic conversion, supply rail monitoring, and photodiode amplification requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LF356M/NOPB 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 for industrial, automotive, and communications markets.
The LF356M/NOPB belongs to TI's legacy JFET-input op amp family designed for high-precision, medium-speed analog signal conditioning - emphasizing low input current, low noise, and robust input stage reliability in demanding instrumentation environments.
FAQ
What is the maximum capacitive load the LF356M/NOPB can drive stably?
The LF356M/NOPB is internally compensated to drive capacitive loads up to 5000 pF without external compensation or isolation resistors. This capability is explicitly validated in the datasheet and enables direct interfacing with DAC outputs, long cables, or high-C filter stages. Stability is maintained across the full recommended operating temperature range (0°C to +70°C) and supply voltages (±15 V). For loads exceeding 5000 pF, a series resistor (typically 10–100 Ω) between the LF356M/NOPB output and the load capacitance restores phase margin.
Does the LF356M/NOPB support single-supply operation?
The LF356M/NOPB is specified for dual-supply operation (±15 V typical), but can function in single-supply configurations with appropriate biasing. Its input common-mode range extends to the negative supply rail and up to the positive supply plus ~100 mV, allowing the noninverting input to be biased at mid-rail (e.g., +7.5 V on a +15 V rail). However, output swing is limited to approximately ±12 V into 2 kΩ, so true rail-to-rail output is not achievable. For dedicated single-supply designs, TI recommends newer alternatives like the TLV2462.
How does the offset adjust feature of the LF356M/NOPB differ from standard op amps?
Unlike many op amps where offset nulling degrades drift or common-mode rejection, the LF356M/NOPB's BALANCE pins (1 and 5) implement a proprietary trimming scheme that adjusts input offset voltage without affecting temperature coefficient (≤5 μV/°C) or CMRR (≥80 dB). This is achieved through matched JFET current sources in TI's BI-FET™ process. The external 10 kΩ potentiometer connects its wiper to V– and ends to pins 1 and 5 - a configuration validated in TI's application notes for LF356M/NOPB.
What is the input voltage noise spectral density of the LF356M/NOPB at 10 Hz?
The LF356M/NOPB exhibits a low 1/f noise corner, with input voltage noise of 15 nV/√Hz at 100 Hz and 12 nV/√Hz at 1 kHz. While the datasheet does not specify the exact value at 10 Hz, Figure 32 (Equivalent Input Noise Voltage) in SNOSBH0D shows noise rising to ~25 nV/√Hz near 10 Hz - consistent with its JFET input architecture. This makes the LF356M/NOPB suitable for DC-coupled, low-frequency precision applications where 1/f noise dominates, such as strain gauge bridges or thermopile amplifiers.
Can the LF356M/NOPB replace the LF356N in existing designs?
Yes, the LF356M/NOPB is a direct drop-in replacement for the through-hole LF356N (PDIP-8) in most applications. Both share identical electrical specifications, pinout, and thermal characteristics. The "M" suffix denotes SOIC-8 packaging, while "NOPB" indicates lead-free (RoHS-compliant) finish. Board layout requires SMT rework, but no schematic or firmware changes are needed. Thermal performance differs slightly (RθJA = 55.2°C/W for SOIC vs. 100°C/W for PDIP), so high-power operation may require review of junction temperature under worst-case conditions.
LF356M/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- BI-FET™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 12V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 pA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 30 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LF356M/NOPB FAQ
1.How can I place an order for LF356M/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LF356M/NOPB 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 LF356M/NOPB reliable?
The price and inventory of LF356M/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF356M/NOPB is usually 5 days.
3.What payment methods are accepted for LF356M/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF356M/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF356M/NOPB?
LF356M/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF356M/NOPB 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 LF356M/NOPB?
For technical support, including LF356M/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF356M/NOPB requirements.
6.How does Aetrix verify that LF356M/NOPB is sourced from the original manufacturer or authorized distributors?
All LF356M/NOPB 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 LF356M/NOPB meets industry standards.
7.What is the process for return or replacement of LF356M/NOPB?
All LF356M/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LF356M/NOPB, 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 LF356M/NOPB part is unused and in its original packaging.
Return procedure for LF356M/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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