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Analog Devices Inc. LT1792CS8#TRPBF
- Part No.:
- LT1792CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1792CS8#TRPBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:865
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Product details
Overview
LT1792CS8#TRPBF from Analog Devices (acquired Linear Technology) is a low-noise, precision JFET-input operational amplifier optimized for high-impedance capacitive transducer signal conditioning. It delivers 4.2 nV/√Hz input voltage noise density at 1 kHz, 600 µV max input offset voltage, and 5.6 MHz gain-bandwidth product under ±15 V supplies - enabling high-fidelity amplification in hydrophone, piezoelectric accelerometer, and photodiode front ends.
For engineers reviewing the LT1792CS8#TRPBF datasheet, LT1792CS8#TRPBF pinout, LT1792CS8#TRPBF application, or LT1792CS8#TRPBF equivalent, key selection criteria include verified 4.2 nV/√Hz noise performance at 1 kHz, guaranteed stability with ≥1000 pF capacitive loads, and SO-8 package compatibility with OPA124/AD743 socket footprints - all critical for low-drift, low-noise instrumentation design.
Technical Context
The LT1792CS8#TRPBF employs a large-geometry JFET differential pair to achieve ultra-low voltage noise while maintaining sub-picoampere bias currents (300–800 pA warmed up). Its architecture eliminates phase reversal across the full common-mode range, enabling robust operation even when inputs exceed supply rails.
It features fully differential input stage design with >10¹¹ Ω input resistance, 14 pF input capacitance, and rail-to-rail output swing capability (±13.2 V into 10 kΩ), supporting both inverting and noninverting configurations - including charge amplifier topologies where gain is set by CF/CS ratio.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 4.2 nV/√Hz at 1 kHz - enables lowest total input-referred noise in transducer impedances >50 kΩ |
| Input Bias Current | 300–800 pA (warmed up) - preserves signal integrity with >100 MΩ source impedances |
| Gain-Bandwidth Product | 5.6 MHz typical - supports stable closed-loop gains up to 100 at 50 kHz |
| Input Offset Voltage | 0.6 mV max (C grade, TA = 25°C) - reduces DC error in precision sensor interfaces |
| Capacitive Load Drive | Stable with ≤1000 pF - eliminates need for isolation resistors in high-C sensor buffers |
| Supply Range | ±5 V to ±20 V - allows low-power ±5 V operation (5.15 mA) or wide dynamic range ±15 V mode |
| Common-Mode Range | –11.0 V to +13.5 V (±15 V supplies) - supports rail-swing input signals without phase reversal |
Pinout & Package
LT1792CS8#TRPBF is housed in an 8-lead plastic SO (SO-8, narrow 0.150") package with standard industry pinout and 190°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOS ADJ | Offset Null Terminal | Connects to potentiometer wiper (tied to V–) for manual offset trimming; compatible with OPA124/AD743 sockets |
| 2 - –IN A | Inverting Input | Differential input node with 14 pF capacitance and >10¹¹ Ω resistance - critical for charge amplifier stability |
| 3 - +IN A | Noninverting Input | High-impedance input referenced to system ground or bias network; balanced with –IN for CMRR >105 dB |
| 4 - V– | Negative Supply Rail | Accepts –5 V to –20 V; provides return path for bias current and sets lower common-mode limit |
| 5 - NC | No Connect | Internally unused; must be left floating - not tied to ground or supply per datasheet |
| 6 - V+ | Positive Supply Rail | Accepts +5 V to +20 V; defines upper common-mode range and output swing ceiling |
| 7 - OUT | Amplifier Output | Capable of ±13.2 V swing into 10 kΩ; drives ≥30 mA short-circuit current for fast settling into heavy capacitive loads |
| 8 - VOS ADJ | Offset Null Terminal | Duplicate of Pin 1; both terminals connect to same internal node - use either or both for nulling |
Key Features
| Feature | Design Value |
|---|---|
| 100% tested voltage noise | Each unit verified for ≤6 nV/√Hz max at 1 kHz - ensures consistent low-noise performance across production lots |
| Unconditional stability | Operates stably at unity gain with ≥1000 pF load capacitance - eliminates external compensation in sensor buffer stages |
| True precision JFET front end | Input bias current drift <10 µV/°C and CMRR >105 dB - maintains accuracy over temperature in field-deployed instruments |
| Extended common-mode range | Inputs functional beyond rails (–11 V to +13.5 V on ±15 V supplies) - prevents phase reversal during transient overloads |
| Low 1/f noise corner | 30 Hz - minimizes drift and low-frequency noise in DC-coupled hydrophone and accelerometer applications |
| Charge amplifier support | Validated inverting configuration with CF/CS gain setting - enables picocoulomb-level sensitivity in piezoelectric sensors |
Applications
| Hydrophone Amplifier | Piezoelectric Accelerometer Interface |
|---|---|
|
Use Scenario: Underwater acoustic sensing with high-impedance ceramic hydrophones (e.g., B&K 8103). IC Role / Device Role / Timing Role: Low-noise preamplifier in first gain stage, configured as noninverting buffer with DC servo loop. Use Value: Achieves 128 nV/√Hz output noise at 1 kHz (G = 20), enabling detection of sub-micropascal acoustic pressure variations. |
Use Scenario: High-sensitivity vibration measurement using B&K 4381 accelerometers in structural health monitoring. IC Role / Device Role / Timing Role: Charge amplifier with CF/CS gain setting and active DC servo for baseline stabilization. Use Value: Delivers 0.8 mV/pC sensitivity and ≤2.7 mV DC output offset, meeting metrology-grade calibration requirements. |
| Photodiode Current-to-Voltage Converter | Low-Noise Instrumentation Front End |
|
Use Scenario: Precision light intensity measurement with Hamamatsu S1336-5BK photodiodes in spectroscopy systems. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 MΩ feedback resistor and 2 pF compensation capacitor. Use Value: Provides 100 mV/µW responsivity at 200 nm and 330 mV/µW at 633 nm with input-referred noise of 4.3 nV/√Hz. |
Use Scenario: DC-coupled signal conditioning for strain gauge bridges and thermopile sensors in industrial process control. IC Role / Device Role / Timing Role: Precision op amp in two- or three-op-amp instrumentation amplifier topology. Use Value: Enables <1 µV/°C offset drift and >120 dB CMRR - critical for sub-µV signal extraction in noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision JFET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1793CS8#TRPBF | Lower input bias current (10 pA vs. 300–800 pA), same 6 nV/√Hz noise floor, but reduced GBW (4.5 MHz) | Better suited for ultra-high-impedance (>1 GΩ) photodiode or electret microphone circuits where IB dominates error | Select LT1793CS8#TRPBF only when bias current <50 pA is mandatory; otherwise LT1792CS8#TRPBF offers superior noise-bandwidth trade-off |
| OPA140AIDR | Higher voltage noise (5.1 nV/√Hz), lower input capacitance (10 pF), rail-to-rail output, but no VOS ADJ pins | Preferred in single-supply systems requiring output swing to V–; lacks offset trim capability for legacy socket replacement | Choose OPA140AIDR for new designs needing rail-to-rail I/O and integrated EMI filtering; retain LT1792CS8#TRPBF for drop-in OPA124/AD743 upgrades |
Compared with LT1793CS8#TRPBF and OPA140AIDR, the LT1792CS8#TRPBF uniquely balances ultra-low voltage noise, user-adjustable offset, and proven socket compatibility - making it the optimal choice for retrofitting legacy low-noise instrumentation while maintaining design continuity.
Availability
LT1792CS8#TRPBF is available at Aetrix Electronics and suitable for hydrophone amplifiers, piezoelectric sensor interfaces, and photodiode transimpedance circuits requiring stable component supply and long-term obsolescence management.
Supply support for LT1792CS8#TRPBF 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) acquired Linear Technology in 2017 and continues to manufacture, qualify, and support its precision analog portfolio including legacy Linear op amps.
The LT1792CS8#TRPBF belongs to Linear's precision JFET op amp family, designed specifically for high-impedance, low-noise sensor signal conditioning in test & measurement, geophysical, and aerospace instrumentation.
FAQ
What is the maximum capacitive load the LT1792CS8#TRPBF can drive without oscillation?
The LT1792CS8#TRPBF is unconditionally stable driving up to 1000 pF capacitive loads at unity gain, as confirmed in the datasheet Figure 13. This eliminates the need for series isolation resistors in high-C sensor buffer applications - unlike many JFET op amps that require external compensation above 100 pF.
Does the LT1792CS8#TRPBF support ±5 V operation, and how does it affect noise performance?
Yes, the LT1792CS8#TRPBF is fully specified for ±5 V supplies. At ±5 V, supply current drops to 5.15 mA (vs. 5.20 mA at ±15 V), reducing die temperature and lowering input bias current - resulting in improved low-frequency noise and drift, though with reduced output swing (±12.3 V max).
Can the LT1792CS8#TRPBF replace OPA124 in existing PCB layouts?
Yes - the LT1792CS8#TRPBF uses the identical SO-8 pinout and VOS ADJ pin configuration as OPA124, allowing direct socket replacement. Offset nulling remains compatible when the potentiometer wiper is tied to V–, and the LT1792CS8#TRPBF improves voltage noise by 0.8 nV/√Hz at 1 kHz.
What is the input voltage noise corner frequency of the LT1792CS8#TRPBF?
The LT1792CS8#TRPBF has a 1/f noise corner at 30 Hz, as shown in Figure G02 of the datasheet. This low corner enables stable DC-coupled operation in hydrophone and accelerometer applications where sub-100 Hz signal fidelity is critical.
How is the LT1792CS8#TRPBF used in a charge amplifier configuration?
In charge amplifier mode, the LT1792CS8#TRPBF operates in inverting configuration with feedback capacitor CF and transducer capacitance CS. Gain equals CF/CS, and RB is added to balance input bias current error. The LT1792CS8#TRPBF's low current noise and high input impedance ensure minimal signal degradation in picocoulomb-range measurements.
LT1792CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3.4V/µs
- Gain Bandwidth Product:
- 5.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 300 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 4.2mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1792CS8#TRPBF FAQ
1.How can I place an order for LT1792CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1792CS8#TRPBF 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 LT1792CS8#TRPBF reliable?
The price and inventory of LT1792CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1792CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1792CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1792CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1792CS8#TRPBF?
LT1792CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1792CS8#TRPBF 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 LT1792CS8#TRPBF?
For technical support, including LT1792CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1792CS8#TRPBF requirements.
6.How does Aetrix verify that LT1792CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1792CS8#TRPBF 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 LT1792CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1792CS8#TRPBF?
All LT1792CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1792CS8#TRPBF, 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 LT1792CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1792CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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