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Analog Devices Inc. LTC6240HVIS8#TRPBF
- Part No.:
- LTC6240HVIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC6240HVIS8#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,243
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Product details
Overview
LTC6240HVIS8#TRPBF from Analog Devices (formerly Linear Technology) is a single, rail-to-rail output, low-noise CMOS operational amplifier optimized for precision signal conditioning in high-impedance sensor interfaces. It delivers 18MHz gain bandwidth, 10V/μs slew rate, 550nVP-P 0.1Hz–10Hz noise, ≤125μV max input offset voltage, and guaranteed ≤1pA input bias current at –40°C to +85°C. It operates from 2.8V to 6V (or ±5.5V HV version) and is used in photodiode amplifiers and medical instrumentation front-ends.
For engineers reviewing the LTC6240HVIS8#TRPBF datasheet, LTC6240HVIS8#TRPBF pinout, LTC6240HVIS8#TRPBF application, or LTC6240HVIS8#TRPBF equivalent, key selection criteria include ultra-low input bias current for high-Z transducers, sub-μV offset stability over temperature, rail-to-rail output swing within 30mV of rails, and SO-8 package compatibility with guard ring PCB layouts.
Technical Context
The LTC6240HVIS8#TRPBF employs a CMOS input stage with guarded input pins and low-input-capacitance design (3.5pF differential, 3pF common-mode) to minimize charge injection and capacitive loading errors in high-gain, high-impedance configurations. Its unity-gain-stable architecture supports direct use in transimpedance amplifiers without external compensation.
It features an output stage capable of sourcing/sinking ≥5mA while swinging to within 30mV of either supply rail under load, enabling full dynamic range utilization in low-voltage systems. The device is fully specified across –40°C to +85°C with guaranteed 2.5μV/°C max offset drift and 80dB min CMRR over 0V to 3.5V common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 18MHz - enables stable closed-loop operation up to ~1.06MHz full-power bandwidth with 3VP-P output into 1kΩ. |
| Input Bias Current | ≤1pA max (–40°C to +85°C) - preserves signal integrity in >1GΩ source impedances (e.g., photodiodes, piezoelectrics). |
| 0.1Hz–10Hz Noise | 550nVP-P - critical for DC-coupled, low-frequency precision measurement without 1/f noise corruption. |
| Input Offset Voltage | ≤125μV max (–40°C to +85°C) - reduces static error in unidirectional current sensing and bridge amplifier applications. |
| Rail-to-Rail Output Swing | Within 30mV of V+ and V– at 5mA load - maximizes usable output voltage range in 3V or 5V single-supply systems. |
| Supply Range | 2.8V to 6V (single) or ±5.5V (HV variant) - supports battery-powered portable instruments and industrial 5V rails. |
| Input Common-Mode Range | Extends to V– (0V) - allows direct interfacing with ground-referenced sensors without level-shifting. |
Pinout & Package
Package: 8-Lead Plastic SO (SO-8), RoHS-compliant, lead-free finish, tape-and-reel packaging. Designed for PCB guard ring implementation to reduce leakage paths in high-impedance circuits.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unused; must be left floating or tied to ground per layout best practices for noise immunity. |
| 2 (V–) | Negative Supply Rail | Reference for internal biasing; connects to system ground (single-supply) or negative rail (dual-supply). |
| 3 (+IN) | Non-Inverting Input | High-impedance CMOS node; requires guarding and short trace routing to minimize pickup and leakage. |
| 4 (–IN) | Inverting Input | Differential input node; used for feedback in transimpedance or inverting configurations. |
| 5 (OUT) | Amplifier Output | Capable of driving ≥5mA; rail-to-rail swing enables direct interface with SAR ADC references or analog switches. |
| 6 (NC) | No Connect | Internally unused; leave unconnected or tie to ground if needed for mechanical stability. |
| 7 (NC) | No Connect | Internally unused; no electrical function; avoid routing signals nearby. |
| 8 (V+) | Positive Supply Rail | Power supply input; bypass with 0.1μF ceramic capacitor close to pin for high-frequency PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | Guaranteed ≤1pA max over –40°C to +85°C - eliminates significant offset error in picoamp-level photodiode or pH electrode amplifiers. |
| Low 0.1Hz–10Hz noise | 550nVP-P - enables accurate DC and low-frequency signal acquisition without post-processing filtering. |
| Rail-to-rail output with 30mV headroom | Delivers full-scale output swing in 3V systems - increases effective resolution when driving 12-bit+ ADCs directly. |
| Unity-gain stable | Operates without external compensation in gain = 1, 2, or inverting configurations - simplifies design of TIA and buffer stages. |
| Specified for guard ring layout | SO-8 package supports PCB guard ring around inputs - reduces surface leakage by >10× in humid or contaminated environments. |
Applications
| Photodiode Amplifier | Medical ECG Front-End |
|---|---|
Use Scenario: Converting weak current from silicon photodiode (e.g., 10pA–1nA) into measurable voltage in pulse oximetry or spectrophotometry. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with 1MΩ–100MΩ feedback resistor; sets gain, bandwidth, and noise floor. Use Value: ≤1pA input bias current prevents saturation and ensures linearity down to picoamp input levels; 550nVP-P noise preserves SNR in low-light conditions. | Use Scenario: Amplifying microvolt-level biopotential signals from skin electrodes in portable ECG monitors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer; provides high CMRR, low noise, and high input impedance. Use Value: Rail-to-rail output swing maximizes dynamic range into 3.3V ADC; 125μV max offset minimizes baseline drift during long-term monitoring. |
| High-Impedance pH Sensor Interface | Low-Noise Charge-Coupled Amplifier |
Use Scenario: Conditioning output from glass pH electrode (≥100MΩ source impedance) in industrial process control analyzers. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-Z electrode from downstream circuitry; rejects common-mode interference. Use Value: Input bias current ≤1pA avoids significant offset shift due to electrode leakage; SO-8 guard ring layout suppresses board-level leakage currents. | Use Scenario: Integrating charge from radiation detectors or MEMS accelerometers in scientific instrumentation. IC Role / Device Role / Timing Role: Charge-to-voltage converter with low-leakage integrator capacitor; defines integration accuracy and reset behavior. Use Value: 3.5pF input capacitance minimizes gain error and settling time; 2.5μV/°C max offset drift maintains calibration stability across ambient temperature swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-input-bias op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4530-1ARZ | 0.1fA typical input bias current (vs. 1pA max), higher 1kHz noise (8.5nV/√Hz vs. 10nV/√Hz max), SO-8 package | Better for femtoamp-level applications (e.g., ion-selective electrodes); less suitable for cost-sensitive medical devices requiring 1pA guarantee | Select ADA4530-1ARZ only when sub-picoamp bias is mandatory and budget allows premium pricing. |
| OPA377AIDR | 2.5pA max input bias current (vs. 1pA), lower GBW (9MHz), higher 0.1–10Hz noise (8.5μVP-P), same SO-8 footprint | Suitable for general-purpose low-noise buffering where 1pA is not required; lower cost but reduced precision in high-Z sensor chains | Choose OPA377AIDR for non-critical industrial sensors where 2.5pA bias and 9MHz GBW meet requirements and BOM cost is prioritized. |
Compared with ADA4530-1ARZ and OPA377AIDR, the LTC6240HVIS8#TRPBF uniquely balances guaranteed 1pA max input bias, 18MHz bandwidth, and 550nVP-P low-frequency noise in an industry-standard SO-8 package-making it optimal for production-grade photodiode and ECG front-ends demanding verified performance across temperature.
Availability
LTC6240HVIS8#TRPBF is available at Aetrix Electronics and suitable for photodiode amplifiers, portable medical instrumentation, and high-impedance sensor signal chains requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +85°C.
Supply support for LTC6240HVIS8#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC6240 family was designed specifically for ultra-low-input-bias, low-noise precision amplification in high-impedance sensor interfaces-including photodiodes, pH electrodes, and piezoelectric transducers-where leakage and 1/f noise dominate system error budgets.
FAQ
What is the maximum guaranteed input bias current for LTC6240HVIS8#TRPBF over its operating temperature range?
The LTC6240HVIS8#TRPBF guarantees ≤1pA maximum input bias current across its full specified operating temperature range of –40°C to +85°C. This specification is explicitly confirmed in the Electrical Characteristics table for the HVI grade (LTC6240HVI) under "IB Input Bias Current" with "l" denoting full-temperature-range testing. The typical value is 0.2pA at 25°C.
Does LTC6240HVIS8#TRPBF support rail-to-rail input common-mode voltage?
No, the LTC6240HVIS8#TRPBF does not support rail-to-rail input common-mode voltage. Its input common-mode range extends to the negative supply rail (V–) but only up to 3.5V above V– when operating on 5V supplies (0V to 3.5V), and up to 1.5V above V– on 3V supplies. It is not specified to accept inputs near V+, making it unsuitable for true rail-to-rail input applications.
Can LTC6240HVIS8#TRPBF drive a 10kΩ load while maintaining rail-to-rail output swing?
Yes, the LTC6240HVIS8#TRPBF maintains rail-to-rail output swing (within 30mV of V+ and V–) with no load and with ISINK/ISOURCE ≤1mA. At 5mA load, output swing degrades to within 190mV of the rails. For a 10kΩ load drawing ≤0.5mA, the LTC6240HVIS8#TRPBF sustains full rail-to-rail performance - confirmed by VOL/VOH specifications under "ISINK = 1mA" and "ISOURCE = 1mA" test conditions.
Is LTC6240HVIS8#TRPBF unity-gain stable, and what is its phase margin at 5V supply?
Yes, the LTC6240HVIS8#TRPBF is unity-gain stable. Per Typical Performance Characteristic Figure G13, its phase margin is ≥60° across –55°C to +125°C at 5V supply (VS = ±2.5V), and remains >50° at VS = ±5V. This ensures robust stability in gain-of-1 buffers, transimpedance amplifiers, and active filters without external compensation.
What is the minimum supply voltage required for guaranteed operation of LTC6240HVIS8#TRPBF?
The LTC6240HVIS8#TRPBF requires a minimum total supply voltage of 2.8V (V+ to V–) for guaranteed operation across its full –40°C to +85°C temperature range. This is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables under "Minimum Supply Voltage (Note 10)" and is validated by PSRR testing at this voltage.
LTC6240HVIS8#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:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 18 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 60 µV
- Current - Supply:
- 2.7mA
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 2.8 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC6240HVIS8#TRPBF FAQ
1.How can I place an order for LTC6240HVIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6240HVIS8#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 LTC6240HVIS8#TRPBF reliable?
The price and inventory of LTC6240HVIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6240HVIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6240HVIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6240HVIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6240HVIS8#TRPBF?
LTC6240HVIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6240HVIS8#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 LTC6240HVIS8#TRPBF?
For technical support, including LTC6240HVIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6240HVIS8#TRPBF requirements.
6.How does Aetrix verify that LTC6240HVIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6240HVIS8#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 LTC6240HVIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6240HVIS8#TRPBF?
All LTC6240HVIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6240HVIS8#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 LTC6240HVIS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC6240HVIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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