My Inquiry
My Account
Analog Devices Inc. LT1793AIS8#PBF
- Part No.:
- LT1793AIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1793AIS8#PBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,674
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1793AIS8#PBF from Analog Devices (acquired Linear Technology) is a precision 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 over full common-mode range - enabling sub-picoampere-level signal integrity in photodiode, hydrophone, and piezoelectric sensor front ends.
For engineers reviewing the LT1793AIS8#PBF datasheet, LT1793AIS8#PBF pinout, LT1793AIS8#PBF application, or LT1793AIS8#PBF equivalent, this page provides verified specifications, SO-8 package terminal mapping, real-world transducer interface use cases, and validated alternative op amps with documented functional trade-offs for instrumentation-grade design validation.
Technical Context
The LT1793AIS8#PBF employs a matched dual-JFET input stage with guarded layout to maintain 10¹³ Ω common-mode input resistance across –10.5 V to +13.5 V, eliminating bias-current-induced CMRR degradation. Its low 1.5 pF input capacitance ensures stable gain linearity up to 4.2 MHz GBW while driving 1000 pF capacitive loads without oscillation.
Unlike conventional JFET op amps, the LT1793AIS8#PBF sustains <10 pA max warmed-up input bias current across temperature (–40°C to 85°C), enabling accurate DC-coupled charge amplification and photodiode I/V conversion where thermal drift of IB directly impacts offset stability and noise floor.
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, outperforming bipolar op amps above 50 kΩ |
| Input Current Noise Density | 0.8 fA/√Hz @ 1 kHz - critical for preserving SNR in >100 MΩ transducer interfaces |
| Input Bias Current (max) | 10 pA @ 25°C, warmed up - stable over full common-mode range, minimizing CM-induced offset drift |
| Gain-Bandwidth Product | 4.2 MHz typ - supports unity-gain-stable active filtering up to 100 kHz with <0.1% gain error |
| Input Resistance (CM) | 10¹³ Ω - prevents loading of high-Z capacitive sensors (e.g., hydrophones, accelerometers) |
| Input Capacitance | 1.5 pF - ensures >99% gain linearity at 100 kHz for AC-coupled transducer buffering |
| Slew Rate | 3.4 V/µs - supports fast settling (<1 µs to 0.1%) in precision data acquisition front ends |
| Supply Current | 5.2 mA max @ ±15 V - balances ultra-low-noise performance with moderate power budget in portable instrumentation |
Pinout & Package
LT1793AIS8#PBF is housed in an 8-lead plastic SOIC (S8) package with JEDEC MS-012AC footprint, 1.27 mm pitch, and 190°C/W junction-to-ambient thermal resistance. The package supports reflow soldering per IPC/JEDEC J-STD-020D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOS ADJ | Offset null adjustment terminal - connects to external potentiometer (10 kΩ–200 kΩ) referenced to V– for <1.3 mV fine-tuning |
| 2 | –IN A | Inverting input - high-impedance JFET gate node; guard ring required for <1 pA leakage in PCB layout |
| 3 | +IN A | Non-inverting input - matched to –IN A for <0.8 mV input offset; requires symmetrical trace routing |
| 4 | V– | Negative supply rail - must be decoupled with 0.1 µF ceramic capacitor within 5 mm of pin |
| 5 | NC | No connect - internal die pad; electrically isolated and must remain unconnected on PCB |
| 6 | V+ | Positive supply rail - accepts ±5 V to ±20 V operation; PSRR >95 dB minimizes supply ripple coupling |
| 7 | OUT | Amplifier output - drives ≥10 kΩ loads to ±13.2 V swing; stable with 1000 pF capacitive load |
| 8 | VOS ADJ | Second offset null terminal - tied to same potentiometer wiper as Pin 1 for balanced nulling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low total input noise | 6 nV/√Hz voltage noise + 0.8 fA/√Hz current noise - optimal for transducer impedances from 10 kΩ to 1 GΩ |
| Constant input bias current | ≤10 pA over full common-mode range (–10.5 V to +13.5 V) - eliminates CM-induced offset nonlinearity |
| Guaranteed 100% tested noise | Every unit screened for ≤8 nV/√Hz max voltage noise - ensures batch-to-batch consistency in metrology systems |
| Unconditional stability | Unity-gain stable with 1000 pF capacitive load - removes need for isolation resistors in photodiode TIA designs |
| High DC precision | 0.65 mV max input offset voltage, 5 µV/°C max drift - supports 16-bit+ resolution in DC-coupled sensor interfaces |
| Extended temperature grade | Specified from –40°C to +85°C - qualified for industrial and automotive under-hood sensor signal chains |
Applications
| Photocurrent Amplification | Hydrophone Signal Conditioning |
|---|---|
Use Scenario: Converting weak photocurrents (sub-pA) from UV/visible photodiodes into measurable voltage signals with minimal added noise. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) front end with programmable gain via feedback resistor; operates in inverting configuration with virtual ground input. Use Value: 0.8 fA/√Hz current noise ensures photocurrent SNR remains dominated by shot noise, not amplifier contribution, even with 100 MΩ feedback resistors. |
Use Scenario: Amplifying microvolt-level acoustic signals from underwater piezoelectric hydrophones with minimal phase distortion. IC Role / Device Role / Timing Role: High-Z buffer and first-stage gain block; configured as unity-gain follower or non-inverting amplifier with R1/R2 network. Use Value: 1.5 pF input capacitance and 10¹³ Ω input resistance preserve hydrophone's native resonant frequency and damping characteristics. |
| Piezoelectric Accelerometer Front End | Low-Drift Instrumentation Amplifier Core |
Use Scenario: Conditioning charge-mode outputs from high-sensitivity accelerometers (e.g., B&K 4381) used in structural health monitoring. IC Role / Device Role / Timing Role: Charge amplifier core with CF/CS ratio defining gain; uses feedback capacitor to integrate transducer charge. Use Value: 3 pA typical input bias current prevents DC drift accumulation in integrator output, enabling stable 0.8 mV/pC sensitivity calibration over hours. |
Use Scenario: Serving as the input-stage amplifier in two- or three-op-amp instrumentation amplifiers for medical ECG or industrial strain gauge readouts. IC Role / Device Role / Timing Role: Precision differential pair driver with matched inputs; provides high CMRR (>102 dB) and low VOS drift in INA topology. Use Value: 5 µV/°C max offset drift and 83–102 dB CMRR ensure <1 µV error in 100 µV full-scale biomedical measurements across –40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, high-input-impedance op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA140AIDR | Lower voltage noise (5.1 nV/√Hz), higher input bias current (10 pA typ), no VOS ADJ pins | Better for low-Z sources (<10 kΩ); unsuitable for DC-coupled charge amplifiers requiring offset trimming | Select when voltage noise dominates system noise and offset nulling is handled digitally or externally |
| ADA4625-1ARZ | Higher slew rate (33 V/µs), wider GBW (33 MHz), but 2× higher input capacitance (3.3 pF) | Preferred for wideband active filters; less suitable for >100 kHz piezoelectric sensor buffering due to reduced gain flatness | Choose for multi-MHz signal paths where bandwidth outweighs ultra-low-noise priority |
Compared with OPA140AIDR and ADA4625-1ARZ, the LT1793AIS8#PBF uniquely combines guaranteed 100% voltage noise screening, dual VOS ADJ pins for analog trimming, and 1.5 pF input capacitance - making it irreplaceable in metrology-grade charge amplifiers and photodiode TIAs demanding sub-pA bias stability and <10 nV/√Hz total noise.
Availability
LT1793AIS8#PBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, hydrophone preamplifiers, and piezoelectric accelerometer signal conditioners requiring stable component supply across industrial, test & measurement, and aerospace programs.
Supply support for LT1793AIS8#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.
The LT1793AIS8#PBF belongs to ADI's legacy Linear Technology precision op amp portfolio, engineered specifically for ultra-low-noise, high-input-impedance sensor interface applications where bias current stability and voltage/current noise synergy define measurement fidelity.
FAQ
What is the maximum guaranteed input bias current for LT1793AIS8#PBF over temperature?
The LT1793AIS8#PBF has a maximum input bias current of 3000 pA over the full –40°C to +85°C operating range, as specified in the Industrial-grade electrical characteristics table. At 25°C, warmed-up IB is guaranteed ≤10 pA, making it suitable for long-integration-time charge amplifiers where bias-induced drift must be minimized. This value is measured after thermal stabilization per Note 3 in the datasheet.
Does LT1793AIS8#PBF support ±5V supply operation, and how does performance change?
Yes, LT1793AIS8#PBF is fully specified for ±5V supplies. Key parameters shift only marginally: input offset voltage increases from 0.65 mV (±15 V) to 1.00 mV (±5 V), supply current drops from 5.2 mA to 5.25 mA, and output swing reduces to ±12.8 V. All noise, gain, and stability specs remain valid, enabling low-voltage portable instrumentation without performance compromise.
Can LT1793AIS8#PBF drive a 1000 pF capacitive load without external compensation?
Yes, LT1793AIS8#PBF is unconditionally stable with 1000 pF capacitive loads in unity-gain configuration, as confirmed in the "Capacitive Load Handling" graph (Figure 13) and Absolute Maximum Ratings. No series isolation resistor or feedback capacitor is required - a key advantage over competing JFET op amps that oscillate or ring under similar conditions.
What is the purpose of the two VOS ADJ pins on LT1793AIS8#PBF?
The dual VOS ADJ pins (Pins 1 and 8) allow balanced offset nulling using a single 10 kΩ–200 kΩ potentiometer wired between V– and V+, with its wiper connected to both pins. This configuration cancels thermally induced offset drift more effectively than single-point nulling, achieving ≤1.3 mV residual offset - critical for DC-coupled sensor systems requiring long-term baseline stability.
How does LT1793AIS8#PBF compare to LT1792 in noise performance?
The LT1792 offers lower voltage noise (4.2 nV/√Hz vs. 6 nV/√Hz for LT1793AIS8#PBF) but higher input bias current (10 pA typ vs. 3 pA typ). LT1793AIS8#PBF achieves superior *total* noise in high-impedance applications (>50 kΩ) due to its 0.8 fA/√Hz current noise - whereas LT1792's higher IB degrades total noise above ~10 kΩ. Choose LT1793AIS8#PBF for photodiode or hydrophone interfaces; LT1792 for low-Z precision buffers.
LT1793AIS8#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:
- 3 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
LT1793AIS8#PBF FAQ
1.How can I place an order for LT1793AIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1793AIS8#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 LT1793AIS8#PBF reliable?
The price and inventory of LT1793AIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1793AIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1793AIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1793AIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1793AIS8#PBF?
LT1793AIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1793AIS8#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 LT1793AIS8#PBF?
For technical support, including LT1793AIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1793AIS8#PBF requirements.
6.How does Aetrix verify that LT1793AIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1793AIS8#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 LT1793AIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1793AIS8#PBF?
All LT1793AIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1793AIS8#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 LT1793AIS8#PBF part is unused and in its original packaging.
Return procedure for LT1793AIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1793AIS8#PBF Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
