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Analog Devices Inc. LT1793IS8#PBF
- Part No.:
- LT1793IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1793IS8#PBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT1793IS8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, JFET-input operational amplifier optimized for ultra-low-noise, high-impedance transducer signal conditioning. It delivers 6 nV/√Hz input voltage noise density at 1 kHz, 0.8 fA/√Hz input current noise density, and 3 pA typical input bias current at 25°C - enabling precision amplification of signals from photodiodes, hydrophones, and piezoelectric accelerometers.
For engineers reviewing the LT1793IS8#PBF datasheet, LT1793IS8#PBF pinout, LT1793IS8#PBF application, or LT1793IS8#PBF equivalent, key selection criteria include verified 1.5 pF input capacitance, guaranteed 4.2 MHz gain-bandwidth product, ±13.2 V output swing into 10 kΩ at ±15 V supplies, unconditional stability with 1000 pF capacitive loads, and full characterization across –40°C to +85°C industrial temperature range.
Technical Context
The LT1793IS8#PBF employs a JFET differential input stage with matched gate structures to maintain sub-10 pA input bias current over its full ±10.5 V to +13.5 V common-mode range, yielding >1013 Ω common-mode input resistance. Its low 1.5 pF input capacitance minimizes phase shift and preserves gain linearity when buffering AC signals from capacitive sources.
Internally compensated for unity-gain stability, the device achieves 3.4 V/µs slew rate and 4.2 MHz gain-bandwidth product while remaining unconditionally stable driving 1000 pF loads - eliminating need for external isolation resistors in charge amplifier or photodiode transimpedance configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise Density | 6 nV/√Hz @ 1 kHz - enables lowest total noise in source impedances >5 kΩ |
| Input Current Noise Density | 0.8 fA/√Hz @ 1 kHz - critical for minimizing noise contribution in >100 kΩ transducer applications |
| Input Bias Current | 3 pA typ @ 25°C, ≤10 pA max (warmed up) - ensures minimal DC error in high-Z sensor interfaces |
| Input Capacitance | 1.5 pF - reduces Miller effect and maintains bandwidth integrity with high-impedance sources |
| Gain-Bandwidth Product | 4.2 MHz typ - supports stable closed-loop gains ≥1 with bandwidth up to ~4 MHz at AV = 1 |
| Slew Rate | 3.4 V/µs typ - enables accurate reproduction of fast-rising low-amplitude signals without distortion |
| Common-Mode Input Range | –10.5 V to +13.5 V @ ±15 V supplies - allows rail-to-rail input operation without phase reversal |
Pinout & Package
LT1793IS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard SO-8 footprint (JEDEC MS-012), 1.27 mm lead pitch, and 5.0 mm × 4.0 mm body size. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOS ADJ | Offset null connection - tied to negative supply via potentiometer for fine VOS trimming |
| 2 | –IN A | Inverting input - high-impedance JFET gate node with 1.5 pF capacitance |
| 3 | +IN A | Non-inverting input - matched high-impedance JFET gate node |
| 4 | V– | Negative supply rail - supports operation down to –20 V |
| 5 | NC | No connect - internal die pad not bonded; must remain floating |
| 6 | V+ | Positive supply rail - supports operation up to +20 V |
| 7 | OUT | Amplifier output - capable of ±13.2 V swing into 10 kΩ load at ±15 V supplies |
| 8 | VOS ADJ | Second offset null terminal - completes 3-terminal nulling network with Pin 1 and V– |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low total input noise | Combines 6 nV/√Hz voltage noise and 0.8 fA/√Hz current noise - optimal for transducers >50 kΩ |
| Stable high-Z interface | 1013 Ω input resistance + 1.5 pF capacitance - preserves signal integrity from piezoelectric/hydrophone sensors |
| Capacitive load immunity | Unconditionally stable with ≥1000 pF load - eliminates need for isolation resistor in photodiode TIAs |
| Wide supply range | Operates from ±4.5 V to ±20 V - supports both low-voltage portable and high-dynamic-range industrial systems |
| Industrial temperature grade | Guaranteed performance from –40°C to +85°C - qualified for harsh-environment instrumentation |
Applications
| Photocurrent Amplification | Hydrophone Signal Conditioning |
|---|---|
Use Scenario: Amplifying nanoamp-level photocurrents from reverse-biased photodiodes in spectrophotometry and laser power monitoring. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1.5 pF input capacitance minimizing phase lag and ensuring stability with large-area diode junction capacitance. Use Value: 0.8 fA/√Hz current noise prevents degradation of SNR in high-resistance (>100 MΩ) photodiode circuits. |
Use Scenario: Buffering millivolt-level acoustic signals from underwater hydrophones with impedance >100 kΩ and capacitance >1 nF. IC Role / Device Role / Timing Role: High-input-impedance voltage follower preserving signal amplitude and phase fidelity across 10 Hz–100 kHz bandwidth. Use Value: 3 pA input bias current avoids DC drift and thermal EMF errors in low-frequency marine sensing applications. |
| Piezoelectric Accelerometer Front End | Low-Noise Instrumentation Amplifier Core |
Use Scenario: Converting charge output from high-sensitivity piezoelectric accelerometers (e.g., B&K 4381) into low-impedance voltage signals. IC Role / Device Role / Timing Role: Charge amplifier core with CF/CS gain configuration; uses 1.5 pF CIN to minimize feedback capacitor sizing errors. Use Value: 6 nV/√Hz voltage noise dominates only below 5 kΩ source resistance - ideal for charge-mode accelerometer interfaces where current noise is negligible. |
Use Scenario: Serving as first-stage amplifier in two- or three-op-amp instrumentation amplifiers for medical ECG or strain gauge bridges. IC Role / Device Role / Timing Role: Precision input stage providing 100 dB CMRR and <1 mV VOS max over temperature - rejecting common-mode interference before gain stages. Use Value: 250 µV typical VOS and 5 µV/°C drift ensure minimal offset-induced errors in high-gain (≥1000×) differential measurements. |
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 |
|---|---|---|---|
| OPA140AIDBVR | Lower voltage noise (4.6 nV/√Hz), higher input bias current (10 pA typ), 11 MHz GBW | Better for low-source-impedance (<5 kΩ) precision voltage amplification; less optimal for >100 kΩ transducers due to higher current noise | Select OPA140AIDBVR when voltage noise dominates system noise floor and wider bandwidth is required |
| AD823ARZ | Bipolar input (2 nA IB), higher voltage noise (12 nV/√Hz), 16 MHz GBW, rail-to-rail output | Suitable for medium-impedance (1–10 kΩ) general-purpose amplification; unsuitable for picoamp-level leakage-critical designs | Select AD823ARZ only for cost-sensitive, non-ultra-low-noise applications where rail-to-rail output swing is mandatory |
Compared with OPA140AIDBVR and AD823ARZ, the LT1793IS8#PBF uniquely balances ultra-low current noise (0.8 fA/√Hz) and competitive voltage noise (6 nV/√Hz) - making it the only viable choice for transducer impedances exceeding 50 kΩ where total integrated noise must be minimized.
Availability
LT1793IS8#PBF is available at Aetrix Electronics and suitable for precision instrumentation, underwater acoustics, and vibration monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1793IS8#PBF 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
Analog Devices, Inc. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision measurement and control.
The LT1793IS8#PBF belongs to Linear Technology's ultra-low-noise JFET op amp family, designed specifically for high-impedance sensor signal chains where minimizing total input-referred noise across wide source resistance ranges is critical.
FAQ
What is the maximum guaranteed input bias current for LT1793IS8#PBF over temperature?
The LT1793IS8#PBF is specified with a maximum input bias current of 3000 pA over the full –40°C to +85°C industrial temperature range. At 25°C, the warmed-up maximum is 10 pA, and typical performance is 3 pA. This ultra-low IB enables reliable operation with transducers having impedances exceeding 1 GΩ without significant DC error accumulation.
Does LT1793IS8#PBF require external compensation for unity-gain stability?
No, the LT1793IS8#PBF is internally compensated and unconditionally stable at unity gain (AV = 1), even when driving capacitive loads up to 1000 pF. This eliminates the need for external compensation networks in photodiode transimpedance amplifiers or charge amplifier configurations - simplifying layout and improving reliability in high-impedance sensor interfaces.
Can LT1793IS8#PBF operate from ±5V supplies while maintaining full specifications?
Yes, the LT1793IS8#PBF is fully specified for operation from ±5V supplies, including guaranteed gain-bandwidth product (2.5 MHz min), slew rate (2.2 V/µs min), and input offset voltage (1.0 mV max for I-grade). All key noise parameters (6 nV/√Hz, 0.8 fA/√Hz) and input impedance (>1013 Ω) remain valid, enabling low-power portable instrumentation without performance trade-offs.
What is the purpose of the NC pin (Pin 5) on LT1793IS8#PBF?
Pin 5 of the LT1793IS8#PBF is a no-connect (NC) terminal - an internal die pad not electrically bonded to any circuit node. It must remain unconnected on the PCB. Unlike thermal pads, this pin serves no thermal or electrical function; routing traces or vias to it may introduce parasitic coupling or contamination risk during assembly.
How does LT1793IS8#PBF achieve low noise with high input impedance?
The LT1793IS8#PBF achieves low noise with high input impedance through a proprietary JFET input stage featuring matched gate geometry and optimized channel doping. This yields 3 pA typical input bias current and 1.5 pF input capacitance simultaneously - minimizing both current-noise contribution (2qIBR²) and voltage-noise degradation from source impedance interaction, unlike bipolar or CMOS alternatives.
LT1793IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- 3.4V/µs
- Gain Bandwidth Product:
- 4.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 4.2mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1793IS8#PBF FAQ
1.How can I place an order for LT1793IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1793IS8#PBF 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 LT1793IS8#PBF reliable?
The price and inventory of LT1793IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1793IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1793IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1793IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1793IS8#PBF?
LT1793IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1793IS8#PBF 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 LT1793IS8#PBF?
For technical support, including LT1793IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1793IS8#PBF requirements.
6.How does Aetrix verify that LT1793IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1793IS8#PBF 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 LT1793IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1793IS8#PBF?
All LT1793IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1793IS8#PBF, 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 LT1793IS8#PBF part is unused and in its original packaging.
Return procedure for LT1793IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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