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Texas Instruments LF156H
- Part No.:
- LF156H
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
LF156H.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:187
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Product details
Overview
LF156H from Texas Instruments is a JFET-input operational amplifier designed for precision, high-speed analog signal conditioning in instrumentation and data acquisition systems. It delivers 12 V/µs slew rate, 5 MHz gain bandwidth, 1.5 µs settling time to 0.01%, 12 nV/√Hz input voltage noise at 1 kHz, and 30 pA typical input bias current - enabling accurate buffering and amplification of high-impedance sensor signals.
For engineers reviewing the LF156H datasheet, LF156H pinout, LF156H application, or LF156H equivalent, this device is selected for low-noise, low-drift, wideband amplifier stages where JFET input impedance (>10¹² Ω), stable offset adjust (without degrading drift or CMRR), and robust large capacitive load drive (up to 5000 pF) are required.
Technical Context
The LF156H uses TI's BI-FET™ process, integrating matched high-voltage JFETs with bipolar transistors on a single die to achieve ultra-low input bias current while maintaining high slew rate and wide bandwidth. Its input stage withstands ±40 V differential input voltage and supports common-mode input up to V+ +100 mV, enabling direct sensing at supply rails.
Offset voltage adjustment is implemented via external resistors on pins 1 and 5 without compromising temperature drift (5 µV/°C typical) or common-mode rejection (100 dB). The output stage drives large capacitive loads stably - a key differentiator versus standard bipolar op amps - due to internal compensation and enhanced phase margin design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 12 V/µs - enables faithful reproduction of fast-rising signals (e.g., DAC outputs, pulse amplifiers) without slew-induced distortion. |
| Gain Bandwidth Product | 5 MHz - supports stable closed-loop gains up to ~50 at 100 kHz, suitable for active filters and precision gain blocks. |
| Settling Time (0.01%) | 1.5 µs - critical for multiplexed data acquisition and sample-and-hold circuits requiring rapid settling after step inputs. |
| Input Voltage Noise | 12 nV/√Hz at 1 kHz - ensures minimal added noise in low-level signal chains (e.g., thermocouple, strain gauge amplification). |
| Input Bias Current | 30 pA typical - preserves signal integrity from ultra-high-impedance sources (e.g., piezoelectric sensors, pH electrodes). |
| Common-Mode Rejection | 100 dB - rejects interference from shared ground paths or noisy power rails in industrial measurement front-ends. |
| Supply Voltage Range | ±15 V to ±20 V - accommodates legacy ±15 V systems and allows headroom for transient margins in rugged environments. |
Pinout & Package
LF156H is available in an 8-pin TO-99 metal can package (body size 9.08 mm × 9.08 mm), optimized for low thermal resistance (RθJC = 23°C/W) and EMI shielding in precision analog applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BALANCE (Pin 1 & 5) | Offset null adjustment terminals | Connect external potentiometer (10 kΩ) between pins 1 and 5, wiper to V–; enables precise VOS trimming without affecting drift or CMRR. |
| +INPUT (Pin 3) | Noninverting input | High-impedance JFET gate node; accepts signals up to V+ +100 mV common-mode, enabling rail-to-rail input referencing. |
| –INPUT (Pin 2) | Inverting input | Differential input node; supports large differential inputs (±40 V) without clamping diodes or degradation. |
| V– (Pin 4) | Negative supply | Reference for internal current sources; input voltages must not fall below this rail to avoid destructive conduction. |
| OUTPUT (Pin 6) | Amplifier output | Capable of driving ≥5000 pF capacitive loads stably - eliminates need for isolation buffers in ADC driver or filter applications. |
| V+ (Pin 7) | Positive supply | Power rail for output stage and internal biasing; supplies current to load independent of input stage quiescent current. |
| NC (Pin 8) | No connection | Internally unconnected; must remain floating - no routing or grounding permitted to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Rugged JFET input stage | Withstands ±40 V differential input and operates with common-mode voltage up to V+ +100 mV - eliminates need for external protection in supply-monitoring circuits. |
| Stable offset adjustment | External nulling via pins 1/5 degrades neither offset drift (5 µV/°C) nor CMRR (100 dB), unlike conventional monolithic op amps. |
| Large capacitive load drive | Stable operation with ≥5000 pF load capacitance - enables direct interface to ADC input capacitors or long coaxial cables without added isolation. |
| Low 1/f noise corner | Very low flicker noise - ideal for precision DC-coupled amplification (e.g., log amps, photodiode transimpedance) using either high- or low-impedance sources. |
| BI-FET™ process integration | Monolithic co-integration of JFETs and bipolar transistors achieves 30 pA IB and 12 V/µs slew rate simultaneously - replaces costly hybrid FET op amps. |
Applications
| Precision Instrumentation Amplifier Front-End | High-Speed DAC Output Buffer |
|---|---|
Use Scenario: Amplifying microvolt-level signals from strain gauges or thermocouples in automated test equipment. IC Role / Device Role / Timing Role: Primary gain and buffering stage with ultra-low input bias current and drift-stable offset nulling. Use Value: Maintains <5 µV/°C offset drift over temperature while rejecting >100 dB of common-mode noise from shared chassis grounds. |
Use Scenario: Driving the reference input of a 12-bit SAR ADC following a fast voltage-mode DAC. IC Role / Device Role / Timing Role: Unity-gain buffer isolating DAC output from ADC sampling capacitance and ensuring monotonic settling. Use Value: 1.5 µs 0.01% settling guarantees full-scale code accuracy within one ADC conversion cycle at ≥500 kSPS. |
| Photocell Signal Conditioning | Logarithmic Converter Core |
Use Scenario: Converting current from a photodiode array into calibrated voltage for optical power monitoring. IC Role / Device Role / Timing Role: Transimpedance amplifier with JFET input preserving photocurrent integrity and minimizing dark current error. Use Value: 30 pA input bias current ensures <0.1% error at 30 nA photocurrent; 12 nV/√Hz noise enables detection down to pW-level optical signals. |
Use Scenario: Building a 5-decade logarithmic converter for RF power measurement (100 µA–1 mA input range). IC Role / Device Role / Timing Role: Precision op amp implementing exponential I–V relationship in feedback loop with matched diode. Use Value: Low 1/f noise corner and stable VOS trim enable ±0.05% linearity over full dynamic range without recalibration. |
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 and core specs (12 V/µs, 5 MHz, 1.5 µs settling), but rated for 0°C to +70°C only; lower max junction temperature (100°C vs. 125°C for LF156H). | Not qualified for extended temperature industrial or military use; unsuitable for −55°C to +125°C operating environments. | Select LF356N only for commercial-grade cost-sensitive designs where full military temp range is unnecessary. |
| TL072CP | Dual-channel, SOIC-8 package; 13 V/µs slew rate, 3 MHz GBW, 18 pA IB, but no offset null pins and only 80 dB CMRR. | Lacks precision nulling capability and lower CMRR limits performance in high-common-mode industrial sensing. | Choose TL072CP for space-constrained dual-amplifier functions where offset stability and rail-sensing are not required. |
Compared with LF356N and TL072CP, the LF156H provides guaranteed operation across −55°C to +125°C, integrated offset nulling without drift penalty, and superior 100 dB CMRR - making it the sole choice for high-reliability, precision analog signal chains in aerospace, defense, and test instrumentation.
Availability
LF156H is available at Aetrix Electronics and suitable for precision instrumentation, high-speed data acquisition, and ruggedized sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LF156H 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 innovation.
The LF156H belongs to TI's LFx5x JFET-input op amp family, engineered specifically to replace expensive hybrid FET amplifiers in high-reliability, wide-temperature, low-noise analog systems - emphasizing ruggedness, stability, and manufacturability.
FAQ
What is the maximum operating temperature range for the LF156H?
The LF156H is specified for operation from −55°C to +125°C ambient temperature, with a maximum junction temperature (TJMAX) of 150°C. This extended temperature range qualifies it for military, aerospace, and harsh-environment industrial applications where standard commercial op amps like the LF356N (0°C to +70°C) would fail.
Does the LF156H require external compensation for stability with capacitive loads?
No - the LF156H features internal compensation optimized for stability with capacitive loads up to 5000 pF. Unlike many general-purpose op amps, it does not require external isolation resistors or lead compensation when driving ADC input capacitors, coaxial cables, or active filter networks, simplifying layout and improving transient response.
How does offset voltage adjustment work on the LF156H without degrading performance?
The LF156H implements offset nulling via pins 1 and 5 using an external 10 kΩ potentiometer. Crucially, this adjustment circuitry is decoupled from the input stage's drift and common-mode rejection paths - verified by datasheet testing showing no degradation in ΔVOS/ΔT (5 µV/°C) or CMRR (100 dB) after trimming.
Can the LF156H be used with single-supply configurations?
The LF156H is designed for dual-supply operation (±15 V typical, ±20 V absolute max) and does not support true single-supply operation. Its input common-mode range extends to V+ +100 mV but does not include the negative rail; output swing is asymmetric (±12 V min into 2 kΩ) and requires both positive and negative supplies for rail-to-rail input/output functionality.
What is the input capacitance of the LF156H, and how does it affect high-frequency design?
The LF156H has a typical input capacitance (CIN) of 3 pF, as confirmed in the datasheet's AC characteristics table. This low value minimizes interaction with feedback networks at high frequencies - critical in transimpedance amplifiers and active filters - and reduces sensitivity to PCB stray capacitance when routing high-impedance nodes.
LF156H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- BI-FET™
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Box
- 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:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-99-8
LF156H FAQ
1.How can I place an order for LF156H through Aetrix?
Please submit a Request for Quotation (RFQ) for LF156H 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 LF156H reliable?
The price and inventory of LF156H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF156H is usually 5 days.
3.What payment methods are accepted for LF156H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF156H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF156H?
LF156H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF156H 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 LF156H?
For technical support, including LF156H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF156H requirements.
6.How does Aetrix verify that LF156H is sourced from the original manufacturer or authorized distributors?
All LF156H 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 LF156H meets industry standards.
7.What is the process for return or replacement of LF156H?
All LF156H units undergo pre-shipment inspection (PSI). If there is an issue with LF156H, 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 LF156H part is unused and in its original packaging.
Return procedure for LF156H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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