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Analog Devices Inc. LTC6268HS8#TRPBF
- Part No.:
- LTC6268HS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC6268HS8#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,736
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Product details
Overview
LTC6268HS8#TRPBF from Analog Devices (formerly Linear Technology) is a single-channel, 500MHz gain-bandwidth FET-input operational amplifier optimized for ultra-low input bias current (±3fA typ. at 25°C), 450fF common-mode input capacitance, and rail-to-rail output swing. It operates from 3.1V to 5.25V supply, draws 16.5mA quiescent current, and features active shutdown. It is widely deployed in high-impedance photodiode transimpedance amplifiers (TIAs) requiring sub-picoampere leakage tolerance and >65MHz closed-loop bandwidth.
For engineers reviewing the LTC6268HS8#TRPBF datasheet, LTC6268HS8#TRPBF pinout, LTC6268HS8#TRPBF application, or LTC6268HS8#TRPBF equivalent, key selection criteria include confirmed fA-level input bias current over –40°C to 125°C, validated 350MHz –3dB bandwidth at unity gain, verified 4.3nV/√Hz voltage noise at 1MHz, and SO-8 package compatibility with guard-ring layout support for board leakage mitigation.
Technical Context
The LTC6268HS8#TRPBF employs a CMOS input buffer stage that bootstraps ESD protection diodes to suppress leakage, enabling its ±3fA input bias current specification. Its complementary differential input pair covers full input common-mode range (0V to 4.5V on 5V supply), with seamless handoff between PNP- and NPN-dominated regions to maintain low distortion across voltage rails.
It integrates a cascode output stage with common-emitter topology, delivering rail-to-rail output swing and 400V/µs slew rate while maintaining stability with capacitive loads up to 10pF. The internal compensation ensures unconditional stability in unity-gain and inverting TIA configurations when paired with optimal feedback capacitance (e.g., 0.28pF for 10kΩ RF and 1pF CIN).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 500MHz - enables stable closed-loop operation up to 350MHz at AV = 1, critical for high-speed ADC driving and broadband TIAs. |
| Input Bias Current | ±3fA typical at 25°C, ≤4pA max at 125°C - preserves signal integrity in picoampere-level photodiode and electrophysiology sensor interfaces. |
| Input Capacitance | 450fF common-mode - minimizes phase shift and peaking in transimpedance amplifiers; enables >65MHz bandwidth with 20kΩ RF. |
| Slew Rate | 400V/µs - supports fast settling of large-signal transients without slewing-induced distortion in pulse-amplification applications. |
| Supply Range | 3.1V to 5.25V - compatible with standard 3.3V and 5V logic domains; allows single-supply operation with rail-to-rail output swing. |
| Operating Temperature | –40°C to 125°C - qualified for automotive under-hood, industrial control, and aerospace sensor front-ends requiring extended thermal robustness. |
| Shutdown Current | ≤1.2mA per amplifier - reduces system power during idle cycles without compromising wake-up latency (tON = 580ns). |
Pinout & Package
The LTC6268HS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with two unconnected pins (Pin 5 and Pin 8) designated for guard-ring implementation to isolate the high-impedance inputs from PCB surface leakage currents.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Active-low shutdown control | Pulled low ≤0.75V to disable amplifier; draws ≤12µA; unconnected = enabled state. |
| 2 (V+) | Positive supply rail | Accepts 3.1V–5.25V; requires local 0.1µF bypass capacitor to ground for PSRR optimization. |
| 3 (OUT) | Amplifier output | Rail-to-rail swing; capable of sourcing/sinking ≥10mA with <200mV saturation voltage. |
| 4 (V–) | Negative supply rail | Typically grounded; supports split supplies if V+–V– remains within 3.1V–5.25V range. |
| 5 (NC) | No connect | Reserved for guard ring routing around +IN/–IN traces to reduce board leakage paths. |
| 6 (–IN) | Inverting input | Valid common-mode range: V– to V+–0.5V; input capacitance 450fF limits stray coupling in TIA nodes. |
| 7 (+IN) | Non-inverting input | Same voltage range and capacitance as –IN; matched to –IN for CMRR >72dB over 0.5V–3.2V. |
| 8 (NC) | No connect | Second guard-ring terminal; used with Pin 5 to encircle input pads and traces on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| FET input architecture | Enables ±3fA input bias current and >1000GΩ input resistance, essential for femtoampere photodiode current measurement. |
| Guard-ring compatible SO-8 package | Two NC pins (5 & 8) allow PCB copper trace routing to shield +IN/–IN from contamination-induced leakage currents. |
| Low 4.3nV/√Hz voltage noise at 1MHz | Minimizes total input-referred noise in high-gain, wideband TIAs where voltage noise dominates over current noise at RF > 10kΩ. |
| 400V/µs slew rate with 17ns 0.1% settling | Supports accurate digitization of fast optical pulses into SAR ADCs without transient-induced harmonic distortion. |
| –100dB THD+N at 1MHz (2VP-P) | Ensures clean signal fidelity in precision analog front-ends for spectroscopy and laser interferometry systems. |
Applications
| Photodiode Transimpedance Amplifier | High-Speed SAR ADC Driver |
|---|---|
Use Scenario: Converting weak photocurrent from low-capacitance photodiodes (e.g., OSI FCI-125G-006) into stable voltage signals for optical sensing. IC Role / Device Role / Timing Role: Primary transimpedance gain stage with 20kΩ feedback resistor and 0.28pF compensation capacitor. Use Value: Achieves 65MHz bandwidth and <100µV RMS output noise due to 450fF CIN and 5.5fA/√Hz current noise. | Use Scenario: Driving the input of 16-bit+ SAR ADCs (e.g., AD7960) with minimal settling error and distortion. IC Role / Device Role / Timing Role: Unity-gain buffer with 350MHz –3dB bandwidth and 17ns 0.1% settling time. Use Value: Delivers –100dB THD+N at 1MHz, preserving ENOB in high-resolution data acquisition systems. |
| CCD Output Buffer | Photomultiplier Tube Post-Amplifier |
Use Scenario: Amplifying low-current, high-impedance analog outputs from linear CCD image sensors. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail output stage interfacing CCD charge-domain signals to downstream processing. Use Value: 4.3nV/√Hz voltage noise and ±3fA bias current prevent dark-current corruption and pixel crosstalk. | Use Scenario: Amplifying microampere-level anode currents from photomultiplier tubes in radiation detection. IC Role / Device Role / Timing Role: First-stage post-amplifier with guarded inputs to reject EMI and leakage in high-gain chains. Use Value: Guard-ring SO-8 layout and 125°C rating enable reliable operation in scintillation detector modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA828IDR | Lower 1.8nV/√Hz voltage noise but higher 10pA max IB at 125°C; no guard-ring pins. | Better for low-noise voltage amplification; unsuitable for fA-level photodiode TIAs above 85°C. | Select LTC6268HS8#TRPBF when fA bias current and 125°C operation are mandatory; OPA828IDR suits lower-temperature, voltage-noise-critical designs. |
| ADA4817-1ARMZ | Higher 2.5pA max IB at 125°C; 1GHz GBW but 10.5mA IQ; no shutdown pin. | Preferred for ultra-wideband voltage gain stages; lacks shutdown and guard-ring capability for low-leakage TIAs. | Choose LTC6268HS8#TRPBF for battery-powered, low-leakage, temperature-robust sensor interfaces; ADA4817-1ARMZ fits high-speed instrumentation requiring >500MHz bandwidth. |
Compared with OPA828IDR and ADA4817-1ARMZ, the LTC6268HS8#TRPBF uniquely combines femtoampere input bias, SO-8 guard-ring support, and guaranteed 125°C performance-making it irreplaceable in high-reliability optical sensing front-ends where leakage and thermal drift must be minimized.
Availability
LTC6268HS8#TRPBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, high-speed SAR ADC drivers, and CCD output buffers requiring stable component supply across automotive, industrial, and test equipment programs.
Supply support for LTC6268HS8#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 semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC6268 product line was developed by Linear Technology (acquired by ADI in 2017) specifically for ultra-low-bias-current, high-speed signal conditioning in optical, scientific, and medical sensor interfaces.
FAQ
What is the maximum operating temperature specification for the LTC6268HS8#TRPBF?
The LTC6268HS8#TRPBF is fully specified over the –40°C to 125°C ambient temperature range, with input bias current guaranteed ≤4pA and gain-bandwidth product maintained at 500MHz across this range. This H-grade qualification makes LTC6268HS8#TRPBF suitable for under-hood automotive and industrial environments where thermal derating is critical.
Does the LTC6268HS8#TRPBF support rail-to-rail output swing?
Yes, the LTC6268HS8#TRPBF delivers true rail-to-rail output swing: it can drive within 140mV of V– and 140mV of V+ while sourcing or sinking 10mA load current. This capability is confirmed across the full –40°C to 125°C range and enables direct interfacing with 3.3V and 5V ADC references without level-shifting circuitry.
How does the guard-ring feature work on the LTC6268HS8#TRPBF SO-8 package?
The LTC6268HS8#TRPBF SO-8 package includes two unconnected pins (Pin 5 and Pin 8) explicitly intended for PCB guard-ring routing. When connected to a clean, low-impedance ground plane surrounding the +IN and –IN traces, these pins shunt surface leakage currents away from the high-impedance input nodes-reducing effective board leakage by >10× and preserving the ±3fA input bias current specification.
What is the recommended feedback capacitor value for a 20kΩ transimpedance amplifier using the LTC6268HS8#TRPBF?
For a 20kΩ transimpedance amplifier with typical photodiode input capacitance (~1pF), the LTC6268HS8#TRPBF datasheet specifies a 0.28pF feedback capacitor (CF) to ensure stable 65MHz bandwidth and critically damped step response. This value compensates for the pole formed by RF and total inverting-node capacitance (CIN + CF), preventing peaking or oscillation.
Can the LTC6268HS8#TRPBF operate from a 3.3V single supply?
Yes, the LTC6268HS8#TRPBF operates from 3.1V to 5.25V total supply voltage, making 3.3V single-supply operation fully supported. At 3.3V, it maintains 350MHz –3dB bandwidth, 4.3nV/√Hz voltage noise, and rail-to-rail output swing from 0V to 3.3V-enabling compact, low-power optical sensor designs without dual-rail supplies.
LTC6268HS8#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:
- 400V/µs
- Gain Bandwidth Product:
- 500 MHz
- -3db Bandwidth:
- 350 MHz
- Current - Input Bias:
- 4 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 16.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3.1 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC6268HS8#TRPBF FAQ
1.How can I place an order for LTC6268HS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6268HS8#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 LTC6268HS8#TRPBF reliable?
The price and inventory of LTC6268HS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6268HS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6268HS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6268HS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6268HS8#TRPBF?
LTC6268HS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6268HS8#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 LTC6268HS8#TRPBF?
For technical support, including LTC6268HS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6268HS8#TRPBF requirements.
6.How does Aetrix verify that LTC6268HS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6268HS8#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 LTC6268HS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6268HS8#TRPBF?
All LTC6268HS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6268HS8#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 LTC6268HS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC6268HS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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