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Texas Instruments LF256H/NOPB
- Part No.:
- LF256H/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
LF256H/NOPB.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,459
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Product details
Overview
LF256H/NOPB from Texas Instruments is a JFET-input operational amplifier in the LFx5x family, designed for precision high-speed integrators and fast D/A and A/D converters. It delivers 12 V/µs slew rate, 5 MHz gain bandwidth, 0.01% settling time in 1.5 µs, input bias current of 30 pA, and operates from ±15 V supply across –25°C to +85°C ambient.
For engineers reviewing the LF256H/NOPB datasheet, LF256H/NOPB pinout, LF256H/NOPB application, or LF256H/NOPB equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The LF256H/NOPB uses BI-FET™ technology-monolithically integrating matched high-voltage JFETs with bipolar transistors-to achieve ultra-low input bias current (30 pA) without sacrificing speed or stability. Its input stage tolerates large differential input voltages independent of supply rails, and its common-mode range extends to the positive supply rail plus ~100 mV.
Offset voltage adjustment is implemented via external resistors on pins 1 and 5, and crucially does not degrade drift (5 µV/°C typical) or common-mode rejection (100 dB). The output stage supports stable operation into capacitive loads up to 5000 pF, enabled by internal compensation and robust drive capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 12 V/µs - enables accurate reproduction of fast-rising signals in data acquisition front-ends without slew-induced distortion |
| Gain Bandwidth Product | 5 MHz - supports closed-loop gains up to 10 at 500 kHz while maintaining phase margin |
| Settling Time (0.01%) | 1.5 µs - critical for multiplexed ADC driver stages requiring rapid channel settling between conversions |
| Input Bias Current | 30 pA - preserves signal integrity in high-impedance sensor interfaces (e.g., piezoelectric, pH electrodes) |
| Input Offset Voltage | 6.5 mV max - low enough for precision DC-coupled amplification when combined with external nulling |
| Common-Mode Rejection | 100 dB - rejects power supply noise and ground bounce in single-supply referenced instrumentation |
| Supply Voltage Range | ±15 V to ±20 V - accommodates industrial ±15 V systems and allows headroom for transient margins |
Pinout & Package
LF256H/NOPB is supplied in an 8-pin SOIC package (4.90 mm × 3.91 mm body), optimized for surface-mount assembly and thermal performance in compact analog signal chains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BALANCE (Pin 1) | Offset null adjust terminal | Connects to one end of external 10-kΩ potentiometer for precise VOS trimming without degrading drift or CMRR |
| –INPUT (Pin 2) | Inverting input | Differential input node; high-impedance JFET gate accepting signals up to ±12 V with minimal loading |
| +INPUT (Pin 3) | Noninverting input | Differential input node; supports common-mode voltages up to V+ + 100 mV for supply-referenced sensing |
| V– (Pin 4) | Negative power supply | Reference for internal biasing; must not be exceeded by either input voltage to avoid destructive conduction |
| BALANCE (Pin 5) | Offset null adjust terminal | Connects to other end of same 10-kΩ potentiometer as Pin 1; forms adjustable voltage divider for offset cancellation |
| OUTPUT (Pin 6) | Amplified output | Capable of driving ≥2 kΩ loads with ±12 V swing; stable into 5000 pF capacitive loads per internal compensation |
| V+ (Pin 7) | Positive power supply | Reference for internal biasing; supplies output stage and input JFETs; decoupling required within 1 cm |
| NC (Pin 8) | No connection | Internally unconnected; must remain floating-no routing or grounding permitted |
Key Features
| Feature | Design Value |
|---|---|
| Rugged JFET input stage | Withstands handling without ESD protection circuitry blow-out; eliminates need for external input clamps in most designs |
| Large differential input voltage tolerance | ±40 V maximum-enables direct interfacing to high-swing sensor outputs or legacy industrial signals without attenuation |
| Offset adjust without performance penalty | VOS trimming preserves 5 µV/°C drift and 100 dB CMRR-unlike conventional op amps where nulling degrades key AC specs |
| Low 1/f noise corner | Enables precision low-frequency amplification (e.g., <10 Hz biomedical signals) with minimal flicker noise contamination |
| High input impedance | 1012 Ω-prevents loading of high-Z sources such as photodiodes, electret mics, or ceramic sensors |
Applications
| High-Impedance Sensor Buffering | Precision Integrator for Analog Computing |
|---|---|
Use Scenario: Amplifying output of a 1011 Ω pH electrode in lab-grade analyzers without signal degradation. IC Role / Device Role / Timing Role: High-Z buffer isolating electrode from downstream circuitry while preserving DC accuracy and low-frequency response. Use Value: 30 pA input bias current ensures <1 mV error at 100 MΩ source impedance; 5 µV/°C drift maintains calibration over temperature cycles. |
Use Scenario: Building resettable analog integrators in missile guidance control loops requiring sub-0.01% linearity over 100-ms intervals. IC Role / Device Role / Timing Role: Core integrator op amp in feedback path of precision current-to-voltage converter with capacitor-based time constant. Use Value: 1.5 µs 0.01% settling enables rapid reset between integration cycles; 12 V/µs slew prevents nonlinear charging during step inputs. |
| Fast D/A Converter Output Driver | Wideband Photocell Amplifier |
Use Scenario: Driving 8-bit DAC output in automated test equipment requiring full-scale transitions within 2 µs. IC Role / Device Role / Timing Role: Unity-gain buffer amplifying DAC voltage output while maintaining monotonicity and minimizing glitch energy. Use Value: 5 MHz GBW and 12 V/µs slew rate ensure <1 LSB settling for 10-V full-scale steps; SOIC package supports dense layout near DAC. |
Use Scenario: Converting photocurrent from a 1-mm² silicon photodiode in optical encoder feedback systems. IC Role / Device Role / Timing Role: Transimpedance amplifier converting nanoamp-level photocurrent to clean voltage with minimal noise contribution. Use Value: 0.01 pA/√Hz input current noise dominates system noise floor; 12 nV/√Hz voltage noise avoids swamping weak photodiode signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar JFET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LF356N | Same pinout, identical AC specs (12 V/µs, 5 MHz), but wider operating temperature range (0°C to +70°C vs. –25°C to +85°C for LF256H/NOPB); higher max input offset voltage (13 mV vs. 6.5 mV) | Preferred for commercial-grade instrumentation where extended temp range is unnecessary and cost is prioritized | Select LF356N only if ambient temperature stays within 0°C–70°C and tighter VOS spec is not required |
| TLC27L4CDR | CMOS input (not JFET), lower supply current (1.4 mA vs. 7 mA), rail-to-rail output, but slower (1.7 V/µs slew, 1.7 MHz GBW) and higher input bias current (0.7 pA typical, but highly VCM-dependent) | Suitable for battery-powered portable instruments needing low power and rail-to-rail output, but not for high-speed or ultra-high-Z applications | Choose TLC27L4CDR only when supply current <2 mA is mandatory and speed/Z requirements are relaxed |
Compared with LF356N, LF256H/NOPB offers superior temperature range and lower offset voltage for industrial environments; compared with TLC27L4CDR, it delivers 7× higher slew rate and 40× lower input bias current-making it irreplaceable in precision high-Z, high-speed analog signal conditioning.
Availability
LF256H/NOPB is available at Aetrix Electronics and suitable for precision instrumentation, industrial process control, and high-fidelity data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LF256H/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 specializing in analog and embedded processing technologies, with decades of heritage in precision op amp design and manufacturing excellence.
The LFx5x product line-including LF256H/NOPB-was engineered specifically for high-speed, low-noise, high-input-impedance analog signal conditioning in industrial, test & measurement, and aerospace applications where JFET input performance is non-negotiable.
FAQ
What is the maximum operating temperature for LF256H/NOPB?
The LF256H/NOPB is rated for operation from –25°C to +85°C ambient temperature. This extended industrial temperature range distinguishes it from the commercial-grade LF356N (0°C to +70°C) and makes it suitable for deployment in harsh environments such as factory automation controllers and outdoor instrumentation enclosures where thermal management is constrained. The device's thermal resistance (RθJA = 55.2°C/W in SOIC) supports reliable operation within this range when PCB copper area and airflow meet datasheet guidelines.
Does LF256H/NOPB support rail-to-rail input or output?
No, LF256H/NOPB does not support rail-to-rail input or output. Its input common-mode range extends to V+ + 100 mV and down to V–, but output swing is limited to ±12 V (minimum) under 2-kΩ load with ±15 V supplies. For true rail-to-rail operation, alternatives like the TLC27L4CDR exist-but they trade off slew rate, input impedance, and noise performance. LF256H/NOPB's architecture prioritizes JFET input fidelity and high-speed stability over output voltage range.
Can LF256H/NOPB drive capacitive loads, and if so, how large?
Yes, LF256H/NOPB is explicitly designed to drive large capacitive loads: the datasheet confirms stable operation into 5000 pF without external compensation. This capability stems from its internally compensated output stage and robust drive strength. In practice, this enables direct connection to ADC input capacitors, long coaxial cables, or LCD bias networks without oscillation-eliminating the need for isolation resistors or complex compensation networks that degrade signal integrity in precision timing and sampling circuits.
How is input offset voltage adjusted on LF256H/NOPB without affecting drift or CMRR?
LF256H/NOPB implements offset nulling via pins 1 and 5 using an external 10-kΩ potentiometer, and its BI-FET™ architecture ensures this adjustment does not degrade drift (5 µV/°C) or common-mode rejection (100 dB). Unlike conventional op amps where nulling injects current into sensitive nodes, the LF256H/NOPB's matched JFET input pair and dedicated nulling path isolate trimming from bias current paths and common-mode feedback loops-preserving key DC and AC performance metrics across temperature and supply variations.
Is LF256H/NOPB pin-compatible with other LFx5x devices like LF156 or LF356?
Yes, LF256H/NOPB shares identical pinout and footprint with LF156, LF356, and all standard 8-pin members of the LFx5x family (SOIC, PDIP, TO-99). This allows drop-in replacement in existing designs-though electrical performance differs: LF256H/NOPB matches LF356's 12 V/µs slew rate and 5 MHz GBW but targets the extended –25°C to +85°C temperature range of the LF156 series. System validation is still recommended due to subtle differences in input capacitance (3 pF) and noise profiles.
LF256H/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- BI-FET™
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Bulk
- 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):
- 10 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-99-8
LF256H/NOPB FAQ
1.How can I place an order for LF256H/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LF256H/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 LF256H/NOPB reliable?
The price and inventory of LF256H/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF256H/NOPB is usually 5 days.
3.What payment methods are accepted for LF256H/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF256H/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF256H/NOPB?
LF256H/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF256H/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 LF256H/NOPB?
For technical support, including LF256H/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF256H/NOPB requirements.
6.How does Aetrix verify that LF256H/NOPB is sourced from the original manufacturer or authorized distributors?
All LF256H/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 LF256H/NOPB meets industry standards.
7.What is the process for return or replacement of LF256H/NOPB?
All LF256H/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LF256H/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 LF256H/NOPB part is unused and in its original packaging.
Return procedure for LF256H/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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