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Analog Devices Inc. LT1792ACS8#PBF
- Part No.:
- LT1792ACS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1792ACS8#PBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,647
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Product details
Overview
LT1792ACS8#PBF from Analog Devices (formerly 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 at 1 kHz, 600 µV max input offset voltage, and 5.6 MHz gain-bandwidth product with ±15 V supplies - enabling high-fidelity amplification in hydrophone, piezoelectric accelerometer, and photodiode front ends.
For engineers reviewing the LT1792ACS8#PBF datasheet, LT1792ACS8#PBF pinout, LT1792ACS8#PBF application, or LT1792ACS8#PBF equivalent, key selection criteria include verified 4.2 nV/√Hz noise performance at 1 kHz, guaranteed 100% tested voltage noise, unconditional stability with ≥1000 pF load capacitance, and SO-8 package compatibility with OPA124/AD743 socket footprints.
Technical Context
The LT1792ACS8#PBF employs a large-geometry JFET input stage to maximize first-stage gain while minimizing voltage noise - achieving 4.2 nV/√Hz at 1 kHz without sacrificing current noise (10 fA/√Hz). Its architecture eliminates phase reversal across the full common-mode range, enabling robust operation in servo-coupled DC-servo amplifier topologies.
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 with ±15 V supplies). The device is unconditionally stable at unity gain and supports direct replacement in legacy sockets for AD745, AD645, and AD820.
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 Offset Voltage | 600 µV max - ensures ≤2.7 mV DC output error in accelerometer servo designs |
| Gain-Bandwidth Product | 5.6 MHz typical - supports stable 20× gain in 250 kHz bandwidth instrumentation channels |
| Common-Mode Range | ±13.5 V with ±15 V supplies - allows direct interfacing to high-voltage sensor outputs |
| Supply Current | 5.2 mA typical - enables low-power operation while maintaining sub-5 nV/√Hz noise |
| Input Bias Current | 800 pA max - minimizes voltage error across 100 MΩ transducer source resistors |
| Output Swing | ±13.2 V into 10 kΩ - delivers full dynamic range without clipping in ±15 V systems |
Pinout & Package
LT1792ACS8#PBF is housed in an industry-standard 8-lead plastic SO (SO-8, narrow 0.150") package with 1.27 mm pitch, JEDEC MS-012AC compliant footprint, 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 for manual offset trimming; compatible with OPA124/AD743 nulling networks |
| 2 (–IN A) | Inverting Input | High-impedance JFET node; 14 pF input capacitance requires careful PCB layout for >100 kHz stability |
| 3 (+IN A) | Non-Inverting Input | Differential pair input; balanced bias current path critical for CMRR >105 dB |
| 4 (V–) | Negative Supply Rail | Accepts –5 V to –20 V; supports single-supply operation when referenced to ground |
| 5 (NC) | No Connect | Internally unused; must remain floating per datasheet - no tie to ground or supply |
| 6 (V+) | Positive Supply Rail | Accepts +5 V to +20 V; enables reduced-noise ±5 V operation with 20°C lower die temperature |
| 7 (OUT) | Amplifier Output | Capable of driving ≥1000 pF loads without oscillation; supports unity-gain buffer configurations |
| 8 (VOS ADJ) | Offset Null Terminal | Second null terminal; tied to same potentiometer as Pin 1 for symmetric adjustment |
Key Features
| Feature | Design Value |
|---|---|
| 100% tested voltage noise | Each unit validated for ≤6 nV/√Hz max at 1 kHz - guarantees noise-critical system performance |
| Unconditional stability | Operates stably at AV = 1 with ≥1000 pF capacitive load - eliminates need for external compensation |
| Phase reversal elimination | Zero-phase-inversion behavior beyond common-mode limits - prevents servo lock-up in closed-loop systems |
| Extended temperature testing | A-grade units 100% tested over –40°C to 85°C - ensures specification compliance across industrial environments |
| Socket-compatible replacement | Direct drop-in for AD743, AD745, OPA124, AD645 - preserves existing PCB layouts and test fixtures |
Applications
| Hydrophone Amplifier | Piezoelectric Accelerometer Front End |
|---|---|
Use Scenario: Amplifying microvolt-level acoustic signals from underwater piezoceramic transducers with 100 pF–5 nF capacitance and >100 MΩ impedance. IC Role / Device Role / Timing Role: Primary low-noise charge/voltage amplifier in DC-servo topology with 128 nV/√Hz output noise at 1 kHz (G = 20). Use Value: 4.2 nV/√Hz input noise enables 20 dB higher SNR vs. AD745 in 1–10 kHz band for deep-ocean sensing. | Use Scenario: Conditioning charge output from B&K 4381-class accelerometers with 100–1000 pC/g sensitivity and 100 MΩ source resistance. IC Role / Device Role / Timing Role: Core transimpedance amplifier with R4C2 = R5C3 > R1(1+R2/R3)C1 DC servo loop for zero-drift operation. Use Value: 600 µV VOS and <2.7 mV DC output error ensure ±0.01 g measurement accuracy over temperature. |
| Photodiode Current-to-Voltage Converter | Low-Noise Instrumentation Amplifier Front End |
Use Scenario: Converting nanoamp photocurrents from Hamamatsu S1336-5BK diodes (CD ≈ 1–2 pF) into calibrated voltage outputs. IC Role / Device Role / Timing Role: Transimpedance amplifier with R2C2 > C1R1 pole cancellation network to suppress 1/f noise and parasitic resonance. Use Value: 10 fA/√Hz current noise dominates only above 50 kΩ source resistance - optimal for photodiode applications. | Use Scenario: First-stage gain block in 3-op-amp instrumentation amplifier for strain gauge or bridge sensor readout. IC Role / Device Role / Timing Role: High-Z differential input stage providing 105 dB CMRR and 85 dB PSRR to reject common-mode interference. Use Value: 10¹¹ Ω input resistance prevents loading of high-impedance Wheatstone bridges, preserving linearity. |
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#PBF | Lower input bias current (10 pA vs. 800 pA), same 6 nV/√Hz noise, but 4.5 MHz GBW | Better for >1 GΩ source impedances; less suitable for high-speed (>200 kHz) transducer interfaces | Select LT1793CS8#PBF when ultra-low IB dominates over bandwidth requirements |
| OPA140AIDR | Higher voltage noise (5.1 nV/√Hz), 11 MHz GBW, rail-to-rail output, but not 100% noise-tested | Superior speed and output swing flexibility; lacks guaranteed noise spec and phase-reversal immunity | Choose OPA140AIDR for wideband, rail-to-rail systems where absolute noise floor is secondary to bandwidth |
Compared with LT1793CS8#PBF and OPA140AIDR, LT1792ACS8#PBF uniquely combines 100% tested 4.2 nV/√Hz noise, unconditional 1000 pF load stability, and phase-reversal immunity - making it the only option qualified for mission-critical hydrophone and accelerometer DC-servo amplifiers requiring guaranteed low-noise performance across temperature.
Availability
LT1792ACS8#PBF is available at Aetrix Electronics and suitable for hydrophone signal chains, piezoelectric sensor interfaces, and photodiode transimpedance amplifiers requiring stable component supply with guaranteed noise performance and long-term industrial availability.
Supply support for LT1792ACS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs for precision signal conditioning and data acquisition.
The LT1792ACS8#PBF belongs to Linear's precision JFET op amp family, engineered specifically for ultra-low-noise amplification of high-impedance capacitive transducers in demanding acoustic, vibration, and optical sensing applications.
FAQ
What is the guaranteed maximum input voltage noise for LT1792ACS8#PBF at 1 kHz?
The LT1792ACS8#PBF is 100% tested for input voltage noise, with a guaranteed maximum of 6 nV/√Hz at 1 kHz. Typical performance is 4.2 nV/√Hz under ±15 V supply conditions at 25°C - a value confirmed across 270 units in statistical distribution testing (LT1792 TA02). This specification applies to the A-grade commercial temperature range (0°C to 70°C).
Can LT1792ACS8#PBF drive a 1000 pF capacitive load at unity gain without oscillation?
Yes, LT1792ACS8#PBF is unconditionally stable at unity gain with load capacitances up to 1000 pF, as explicitly verified in the datasheet (page 1). This eliminates the need for external compensation networks in unity-gain buffer or charge amplifier configurations - a key differentiator versus most JFET op amps that require isolation resistors or feedback capacitors for stability.
Is LT1792ACS8#PBF pin-compatible with AD743 or OPA124?
Yes, LT1792ACS8#PBF uses the standard SO-8 package with identical pinout to AD743, OPA124, AD745, AD645, and AD820. The datasheet confirms direct socket insertion (page 7), including compatibility of the VOS ADJ pins (1 and 8) with existing nulling potentiometer networks tied to the negative supply rail.
What is the input offset voltage drift over temperature for LT1792ACS8#PBF?
The LT1792ACS8#PBF has a maximum average input offset voltage drift of 40 µV/°C over the full –40°C to 85°C range (page 4, ∆VOS parameter). For the A-grade version (0°C to 70°C), the drift is tighter at 10 µV/°C max - verified by 100% temperature testing per Note 8 in the datasheet.
Does LT1792ACS8#PBF support ±5 V supply operation?
Yes, LT1792ACS8#PBF is fully specified for ±5 V supplies (pages 2–4), delivering 5.15 mA supply current, 1.2–3.2 mV input offset voltage, and 4.5 MHz gain-bandwidth product. Operation at ±5 V reduces die temperature by ~20°C versus ±15 V, lowering input bias current and improving long-term stability in thermally constrained systems.
LT1792ACS8#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:
- 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
LT1792ACS8#PBF FAQ
1.How can I place an order for LT1792ACS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1792ACS8#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 LT1792ACS8#PBF reliable?
The price and inventory of LT1792ACS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1792ACS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1792ACS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1792ACS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1792ACS8#PBF?
LT1792ACS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1792ACS8#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 LT1792ACS8#PBF?
For technical support, including LT1792ACS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1792ACS8#PBF requirements.
6.How does Aetrix verify that LT1792ACS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1792ACS8#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 LT1792ACS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1792ACS8#PBF?
All LT1792ACS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1792ACS8#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 LT1792ACS8#PBF part is unused and in its original packaging.
Return procedure for LT1792ACS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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