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Analog Devices Inc. LT1169CS8#TRPBF
- Part No.:
- LT1169CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1169CS8#TRPBF.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,699
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Product details
Overview
LT1169CS8#TRPBF from Analog Devices (acquired 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 LT1169CS8#TRPBF datasheet, LT1169CS8#TRPBF pinout, LT1169CS8#TRPBF application, or LT1169CS8#TRPBF equivalent, this page provides verified specifications, package-confirmed pin functions, real-world transducer interface use cases, and validated alternative options for precision instrumentation front ends.
Technical Context
The LT1169CS8#TRPBF uses matched JFET input stages with enlarged geometry to achieve simultaneous low voltage and current noise - a design that avoids the trade-off seen in bipolar op amps. Its input stage maintains constant bias current across ±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 voltage noise (≤8 nV/√Hz). The device is unconditionally stable at unity gain with up to 1000 pF capacitive load and supports ±5 V to ±20 V dual supplies, with guaranteed matching specs for instrumentation amplifier topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 6 nV/√Hz @ 1 kHz - enables lowest total noise in >50 kΩ source impedance applications |
| Current Noise Density | 1 fA/√Hz @ 1 kHz - critical for minimizing noise contribution from high-Z transducers |
| Input Bias Current | 5 pA typ (20 pA max, warmed up) - remains stable across full common-mode range, preserving DC accuracy |
| Input Capacitance | 1.5 pF - ensures high AC gain linearity when buffering capacitive sensors (e.g., piezoelectrics) |
| Gain-Bandwidth Product | 5.3 MHz typ - supports stable closed-loop bandwidths up to ~500 kHz at G = 10 |
| Input Resistance | 10¹³ Ω common-mode - prevents signal attenuation and drift in photodiode/hydrophone interfaces |
| Slew Rate | 4.2 V/µs - sufficient for fast settling in servo-controlled DC-servo transducer circuits |
Pinout & Package
LT1169CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package, 0.150-inch narrow body, RoHS-compliant, tape-and-reel format (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Inverting amplifier output - drives feedback networks in transimpedance or active filter configurations |
| 2 | –IN A | Inverting input - connects to photodiode cathode or transducer low-side in I/V conversion |
| 3 | +IN A | Noninverting input - referenced to guard or bias network in high-Z sensor buffering |
| 4 | V– | Negative supply rail - must be decoupled locally to minimize noise coupling into high-Z inputs |
| 5 | V+ | Positive supply rail - supports ±5 V to ±20 V operation; requires low-ESR ceramic bypassing |
| 6 | OUT B | Second amplifier output - used for reference channel, servo loop, or dual-path instrumentation |
| 7 | –IN B | Second inverting input - enables matched dual-channel designs like 3-op-amp instrumentation amps |
| 8 | +IN B | Second noninverting input - provides matched offset/bias tracking for differential sensor pairs |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low combined noise floor | 6 nV/√Hz + 1 fA/√Hz enables best-in-class SNR for >100 kΩ source impedances |
| Guaranteed matching specs | ΔVOS ≤ 3.5 mV, ΔIB+ ≤ 20 pA - ensures <0.8 mV offset in 3-op-amp instrumentation amplifiers |
| Full common-mode bias stability | 5 pA IB maintained from –10.5 V to +13.5 V CM - eliminates current-noise drift in wide-range DC servos |
| Unity-gain stable with heavy capacitive loads | Operates cleanly with 1000 pF directly on output - simplifies anti-aliasing filter integration |
| 100% tested key parameters | Voltage noise, slew rate, and GBW verified per unit - guarantees performance without binning |
Applications
| Photocurrent Amplifier | Hydrophone Preamplifier |
|---|---|
Use Scenario: Amplifying sub-nA photocurrents from Hamamatsu S1336-5BK photodiodes under 200–633 nm illumination. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 MΩ feedback resistor and 2–5 pF compensation capacitor. Use Value: Delivers 100 mV/µW sensitivity at 200 nm and 330 mV/µW at 633 nm with <3 mV output offset under balanced light conditions. |
Use Scenario: Conditioning low-level AC signals from underwater acoustic transducers with 100 pF–5 nF capacitance and >100 MΩ source resistance. IC Role / Device Role / Timing Role: DC-servo-coupled high-Z buffer with 100 MΩ feedback and 0.47 µF integrator capacitor. Use Value: Achieves 128 nV/√Hz output noise at 1 kHz (G = 20) and ≤2.5 mV DC output drift below 70°C ambient. |
| Piezoelectric Accelerometer Interface | Two-Op-Amp Instrumentation Front End |
Use Scenario: Signal conditioning for Brüel & Kjær 4381 accelerometers requiring charge-to-voltage conversion and DC servo stabilization. IC Role / Device Role / Timing Role: Inverting charge amplifier with 1250 pF transducer capacitance and 100 MΩ feedback resistor. Use Value: Provides 0.8 mV/pC (8.0 mV/g) sensitivity and 8 nV/√Hz output noise at 1 kHz with ≤1.9 mV DC output offset. |
Use Scenario: Precision differential gain stage for industrial strain gauge or RTD bridges where matched amplifier performance dominates system error. IC Role / Device Role / Timing Role: Dual-channel matched pair providing gain, common-mode rejection, and offset cancellation in 2-op-amp IA topology. Use Value: Guarantees ΔCMRR ≥ 78 dB and ΔPSRR ≥ 80 dB - reducing bridge imbalance errors by >2× vs discrete dual op amp solutions. |
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 | Lower voltage noise (4.5 nV/√Hz), same 1 fA/√Hz current noise, but single-supply limited (±5 V min); no guaranteed matching specs. | Better for ultra-low-noise single-channel apps (e.g., spectroscopy preamps); unsuitable for matched IA front ends. | Select LT1113CN8 only when absolute minimum voltage noise is prioritized over channel matching and dual-supply flexibility. |
| AD822ARZ | Higher input bias current (25 pA typ), higher voltage noise (12 nV/√Hz), no guaranteed matching; wider supply range (±2.5 V to ±18 V). | Acceptable for general-purpose low-noise buffering where transducer Z < 10 kΩ; not viable for >50 kΩ photocurrent or hydrophone apps. | Choose AD822ARZ only for cost-sensitive, non-critical transducer interfaces where 12 nV/√Hz noise and 25 pA IB are acceptable. |
Compared with LT1113CN8 and AD822ARZ, the LT1169CS8#TRPBF uniquely combines guaranteed dual-channel matching, ultra-low current noise, and full common-mode bias stability - making it the only option qualified for precision 3-op-amp instrumentation amplifiers and DC-servo hydrophone systems.
Availability
LT1169CS8#TRPBF is available at Aetrix Electronics and suitable for photocurrent amplification, hydrophone preamplification, and piezoelectric accelerometer signal conditioning requiring stable component supply, long-term obsolescence management, and traceable sourcing for medical, aerospace, and test equipment OEMs.
Supply support for LT1169CS8#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 maintains full technical and manufacturing continuity for legacy Linear op amp families including the LT1169 series.
The LT1169CS8#TRPBF belongs to Linear Technology's precision JFET op amp product line, engineered specifically for ultra-low-noise, high-input-impedance signal acquisition in scientific instrumentation, acoustic sensing, and optical detection systems.
FAQ
What is the maximum capacitive load the LT1169CS8#TRPBF can drive while remaining stable?
The LT1169CS8#TRPBF is unconditionally stable at unity gain with up to 1000 pF capacitive load, as confirmed in the datasheet's TPC17 plot and electrical characteristics table. This allows direct connection to anti-aliasing filters or long cables without external isolation resistors - a key advantage over many competing JFET op amps that oscillate above 100 pF.
Does the LT1169CS8#TRPBF maintain low input bias current across its full common-mode voltage range?
Yes. The LT1169CS8#TRPBF guarantees ≤20 pA input bias current (warmed up) across the entire common-mode range of –10.5 V to +13.5 V at ±15 V supplies. This stability - unlike most JFET op amps - ensures consistent current noise and input resistance in DC-servo circuits where input voltage swings widely.
How does the LT1169CS8#TRPBF compare to the LT1113 in terms of noise performance and application suitability?
The LT1113 offers lower voltage noise (4.5 nV/√Hz vs. 6 nV/√Hz), but lacks guaranteed matching specs and has stricter minimum supply requirements (±5 V). The LT1169CS8#TRPBF adds channel matching, wider supply flexibility (±20 V), and full common-mode bias stability - making it superior for 3-op-amp instrumentation amplifiers and dual-sensor DC-servo systems where LT1113 cannot be substituted.
Is the LT1169CS8#TRPBF pin-compatible with the LT1169CN8 (PDIP version)?
Yes. Both LT1169CS8#TRPBF (SOIC-8) and LT1169CN8 (PDIP-8) share identical pinout per Linear Technology's S8 and N8 package standard - pins 1–8 map identically to OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, and +IN B. Layout migration between packages requires only footprint change, no schematic modification.
What is the typical input offset voltage drift over temperature for the LT1169CS8#TRPBF?
The LT1169CS8#TRPBF exhibits a typical average input offset voltage drift of 20 µV/°C (max 50 µV/°C), as specified in the –40°C to +85°C operating temperature range. This low drift - combined with guaranteed offset match (≤3.5 mV) - makes it suitable for precision DC-coupled transducer interfaces where thermal stability is critical.
LT1169CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1169CS8#TRPBF FAQ
1.How can I place an order for LT1169CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1169CS8#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 LT1169CS8#TRPBF reliable?
The price and inventory of LT1169CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1169CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1169CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1169CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1169CS8#TRPBF?
LT1169CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1169CS8#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 LT1169CS8#TRPBF?
For technical support, including LT1169CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1169CS8#TRPBF requirements.
6.How does Aetrix verify that LT1169CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1169CS8#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 LT1169CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1169CS8#TRPBF?
All LT1169CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1169CS8#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 LT1169CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1169CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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