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Analog Devices Inc. LT1169CN8#PBF
- Part No.:
- LT1169CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1169CN8#PBF.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,423
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Product details
Overview
LT1169CN8#PBF from Analog Devices (formerly Linear Technology) is a dual low-noise JFET-input operational amplifier optimized for high-impedance transducer signal conditioning. It delivers 6 nV/√Hz voltage noise, 1 fA/√Hz current noise, 5 pA typical input bias current over full common-mode range, and 1.5 pF input capacitance - enabling ultra-low-noise amplification of photocurrents, hydrophone outputs, and piezoelectric sensor signals.
For engineers reviewing the LT1169CN8#PBF datasheet, LT1169CN8#PBF pinout, LT1169CN8#PBF application, or LT1169CN8#PBF equivalent, key selection criteria include guaranteed matching specifications for instrumentation front ends, unconditional stability with ≥1000 pF capacitive loads, ±13.8 V output swing at 10 kΩ load, and validated performance at ±5 V and ±15 V supplies across –40°C to +85°C.
Technical Context
The LT1169CN8#PBF employs matched JFET input stages with differential geometry scaled to minimize both voltage and current noise simultaneously. Its input stage maintains constant bias current (≤20 pA max, warmed up) across the full ±10.5 V to ±13.5 V common-mode range, ensuring stable 10¹³ Ω common-mode input resistance and minimal current-noise degradation.
Each amplifier is 100% tested for slew rate (4.2 V/µs), gain-bandwidth product (5.3 MHz), and input voltage noise (≤8 nV/√Hz max at 1 kHz). The device supports unity-gain stable operation and features independent biasing per channel to prevent crosstalk under overdrive conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise Density | 6 nV/√Hz typ @ 1 kHz - enables lowest total noise in >50 kΩ source impedance applications |
| Input Current Noise Density | 1 fA/√Hz typ @ 1 kHz - critical for preserving SNR with high-Z capacitive transducers |
| Input Bias Current | 5 pA typ (20 pA max, warmed up) - stable across full common-mode range, enabling precision DC-coupled sensing |
| Input Capacitance | 1.5 pF - ensures high gain linearity when buffering AC signals from photodiodes or accelerometers |
| Gain-Bandwidth Product | 5.3 MHz typ - supports bandwidth-critical active filtering and servo loop design |
| Output Voltage Swing | ±13.8 V @ RL = 10 kΩ - delivers full dynamic range into standard test loads without rail compression |
| Common-Mode Rejection Ratio | 95 dB min - suppresses interference in single-ended sensor interfaces referenced to noisy grounds |
Pinout & Package
N8 package: 8-lead plastic DIP (0.300" wide), RoHS-compliant, through-hole mountable. Pin 1 identifier notch located at top-left corner when viewed from top with pin 1 in upper-left position.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load or feedback network; capable of ±13.8 V swing into 10 kΩ |
| 2 | –IN A | Inverting input of Amplifier A - high-impedance node (10¹³ Ω); sensitive to layout parasitics |
| 3 | +IN A | Non-inverting input of Amplifier A - matched to Pin 2 for offset and bias current tracking |
| 4 | V– | Negative supply rail - must be decoupled locally with ≥0.1 µF ceramic capacitor |
| 5 | V+ | Positive supply rail - accepts ±5 V to ±20 V; phase-reversal-free operation down to ±5 V |
| 6 | OUT B | Amplifier B output - electrically isolated from OUT A; supports independent gain configurations |
| 7 | –IN B | Inverting input of Amplifier B - guaranteed matching to –IN A for CMRR and PSRR symmetry |
| 8 | +IN B | Non-inverting input of Amplifier B - matched to Pin 7 for instrumentation amplifier front-end accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed matching specs | Offset voltage match ≤3.5 mV, bias current match ≤20 pA - enables high-accuracy 3-op-amp instrumentation amps |
| Unconditional stability | Stable at unity gain with ≥1000 pF capacitive load - eliminates need for isolation resistors in sensor buffering |
| Extended common-mode range | Operates with inputs up to ±13.5 V on ±15 V supplies - supports direct interfacing to unattenuated transducer outputs |
| Low thermal drift | Average offset drift ≤50 µV/°C - maintains calibration integrity in ambient-varying industrial enclosures |
| High input resistance | 10¹³ Ω common-mode input resistance - prevents signal attenuation in >100 MΩ photocurrent measurement paths |
Applications
| Photocurrent Amplifier | Hydrophone Amplifier |
|---|---|
Use Scenario: Amplifying sub-nanoamp photocurrents from Hamamatsu S1336-5BK photodiodes in optical power meters. IC Role / Device Role / Timing Role: Transimpedance amplifier front end with 1 MΩ feedback resistor and 2–5 pF compensation. Use Value: 6 nV/√Hz voltage noise + 1 fA/√Hz current noise yields 100 mV/µW responsivity at 633 nm with <3 mV output offset under balanced illumination. | Use Scenario: Conditioning low-level AC signals from underwater acoustic hydrophones with 100–5000 pF capacitance. IC Role / Device Role / Timing Role: DC-servo stabilized amplifier with 100 MΩ feedback and 0.47 µF integrator capacitor. Use Value: 128 nV/√Hz output noise at 1 kHz (G = 20) and ≤2.5 mV DC output enable sub-µPa acoustic detection in marine monitoring systems. |
| Piezoelectric Accelerometer Interface | Instrumentation Amplifier Front End |
Use Scenario: Signal conditioning for Brüel & Kjær 4381 charge-output accelerometers in vibration testing. IC Role / Device Role / Timing Role: Charge amplifier with 1250 pF transducer capacitance, 100 MΩ feedback, and 2 µF servo integrator. Use Value: 8 nV/√Hz output noise at 1 kHz and 0.8 mV/pC sensitivity (8.0 mV/g) support high-fidelity structural health monitoring below 100 Hz. | Use Scenario: Precision front end for 3-op-amp instrumentation amplifiers measuring bridge sensor outputs in weigh scales. IC Role / Device Role / Timing Role: Matched pair providing offset cancellation, CMRR enhancement, and gain-setting accuracy. Use Value: Guaranteed ∆VOS ≤3.5 mV and ∆IB+ ≤20 pA reduce system offset error to <0.8 mV and input bias current to 4 pA in final design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual JFET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1113CN8#PBF | Lower voltage noise (4.5 nV/√Hz), higher supply current (7.5 mA/amplifier), same N8 package | Better for ultra-low-noise <5 kΩ source impedances; less optimal for >100 kΩ due to higher current noise | Select LT1113CN8#PBF only when voltage noise dominates total noise budget and supply current is not constrained. |
| AD822ARZ | Higher input bias current (12 pA typ), lower GBW (1.8 MHz), SOIC-8 package, no guaranteed matching specs | Suitable for general-purpose low-noise buffering but not for precision matched front ends or >50 kΩ transducer interfaces | Choose AD822ARZ for cost-sensitive, non-matching applications where 12 pA bias current and 1.8 MHz bandwidth are acceptable. |
Compared with LT1113CN8#PBF and AD822ARZ, the LT1169CN8#PBF uniquely balances ultra-low current noise (1 fA/√Hz) with competitive voltage noise (6 nV/√Hz) and guaranteed matching - making it the only option qualified for high-impedance instrumentation amplifier front ends requiring <3.5 mV offset match and stable 5 pA bias current across temperature.
Availability
LT1169CN8#PBF is available at Aetrix Electronics and suitable for photocurrent amplification, hydrophone signal conditioning, piezoelectric accelerometer interfaces, and precision instrumentation amplifier front ends requiring stable component supply across industrial temperature ranges.
Supply support for LT1169CN8#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear products including the LT1169 series.
The LT1169CN8#PBF belongs to Linear's precision JFET op amp product line, engineered specifically for high-impedance, low-noise sensor signal chains in test equipment, medical instrumentation, and acoustic monitoring systems.
FAQ
What is the maximum guaranteed input bias current for LT1169CN8#PBF at 25°C?
The LT1169CN8#PBF has a maximum guaranteed input bias current of 5 pA at 25°C (typical), with a warmed-up maximum of 20 pA. This specification is verified across the full common-mode input range (–10.5 V to +13.5 V on ±15 V supplies), ensuring stable high-impedance interface performance in LT1169CN8#PBF-based transducer circuits.
Does LT1169CN8#PBF support ±5 V supply operation with full specification compliance?
Yes, LT1169CN8#PBF guarantees all key specifications-including input offset voltage (≤2.2 mV), input bias current (≤20 pA warmed up), and gain-bandwidth product (≥3.3 MHz)-under ±5 V supply conditions. The device also maintains phase-reversal-free operation with inputs extending beyond the rails, as confirmed in LT1169CN8#PBF application note TA04.
How does LT1169CN8#PBF achieve stability with large capacitive loads?
The LT1169CN8#PBF achieves unconditional stability with ≥1000 pF capacitive loads through internal compensation and optimized output stage design. Unlike many JFET op amps requiring external isolation resistors, LT1169CN8#PBF maintains unity-gain stability without added components-verified in TPC17 and TA04 of the official datasheet.
Are matching specifications for LT1169CN8#PBF tested per unit or statistically derived?
All matching specifications for LT1169CN8#PBF-including ∆VOS, ∆IB+, ∆CMRR, and ∆PSRR-are 100% tested per unit during final test. Each LT1169CN8#PBF die undergoes individual characterization to guarantee offset voltage match ≤3.5 mV and noninverting bias current match ≤20 pA, enabling reliable use in matched-pair instrumentation amplifier designs.
Can LT1169CN8#PBF replace OPA2111 or OP215 in existing designs?
Yes, LT1169CN8#PBF is a direct replacement for OPA2111 and OP215 in N8-package designs, offering superior noise performance (6 nV/√Hz vs. 12–15 nV/√Hz), lower input bias current (5 pA vs. 25–50 pA), and guaranteed matching. Pin compatibility and identical footprint allow drop-in substitution without PCB changes in LT1169CN8#PBF retrofits.
LT1169CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 4.2V/µs
- Gain Bandwidth Product:
- 5.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 pA
- Voltage - Input Offset:
- 600 µV
- Current - Supply:
- 5.3mA (x2 Channels)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1169CN8#PBF FAQ
1.How can I place an order for LT1169CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1169CN8#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 LT1169CN8#PBF reliable?
The price and inventory of LT1169CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1169CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1169CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1169CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1169CN8#PBF?
LT1169CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1169CN8#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 LT1169CN8#PBF?
For technical support, including LT1169CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1169CN8#PBF requirements.
6.How does Aetrix verify that LT1169CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1169CN8#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 LT1169CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1169CN8#PBF?
All LT1169CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1169CN8#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 LT1169CN8#PBF part is unused and in its original packaging.
Return procedure for LT1169CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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