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Analog Devices Inc. LTC6268IS6#TRMPBF
- Part No.:
- LTC6268IS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC6268IS6#TRMPBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,821
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Product details
Overview
LTC6268IS6#TRMPBF 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-low shutdown. It is widely used in high-speed transimpedance amplifiers for photodiode signal conditioning.
For engineers reviewing the LTC6268IS6#TRMPBF datasheet, LTC6268IS6#TRMPBF pinout, LTC6268IS6#TRMPBF application, or LTC6268IS6#TRMPBF equivalent, key selection criteria include guaranteed –40°C to 85°C operation, 6-lead TSOT-23 package with validated 350MHz –3dB bandwidth (AV = 1), 4.3nV/√Hz voltage noise at 1MHz, and 5.5fA/√Hz current noise at 100kHz - all critical for low-noise, high-impedance sensor front-ends.
Technical Context
The LTC6268IS6#TRMPBF employs a CMOS input buffer stage that bootstraps ESD protection diodes to achieve femtoampere-level input bias current while maintaining 450fF common-mode input capacitance. Its complementary differential input stage covers full input voltage range (V– to V+ – 0.5V) across temperature.
It delivers 400V/µs slew rate, –100dB harmonic distortion at 1MHz, and stable unity-gain operation without external compensation. The shutdown function reduces supply current to 0.85mA max, with 480ns turn-off and 580ns turn-on delay, enabling fast power cycling in burst-mode optical receivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 500MHz - enables stable closed-loop operation up to 350MHz (AV = 1) for high-speed TIA and ADC driver designs. |
| Input Bias Current | ±3fA typical at 25°C - ensures minimal error in picoampere-level photodiode or electrophysiology sensor current measurement. |
| Input Capacitance | 450fF common-mode - minimizes feedback pole formation in transimpedance amplifiers, preserving bandwidth with low-CIN photodiodes. |
| Voltage Noise Density | 4.3nV/√Hz at 1MHz - supports low-noise amplification of weak signals in CCD output buffers and PMT post-amplifiers. |
| Current Noise Density | 5.5fA/√Hz at 100kHz - critical for optimizing total input-referred noise in high-RF (>100kΩ) TIAs. |
| Supply Range | 3.1V to 5.25V - compatible with standard 3.3V and 5V logic rails, enabling direct interface with SAR ADC references and digital controllers. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and medical instrumentation environments requiring extended thermal stability. |
Pinout & Package
Package: 6-lead TSOT-23 (S6), 0.95mm × 1.6mm footprint, exposed pad not present, rated θJA = 192°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive power supply | Accepts 3.1V–5.25V; requires local 0.1µF bypass to ground for high-frequency PSRR maintenance. |
| SHDN | Active-low shutdown control | Pulled low ≤0.75V (vs V–) disables amplifier; left open-circuit enables operation; sinks ≤12µA at logic high. |
| –IN | Inverting input | Input voltage range: V– to V+ – 0.5V; guarded by NC pins in SO-8 variant - not applicable in S6 package. |
| OUT | Amplifier output | Rail-to-rail swing; drives ≥10mA load; 400V/µs slew rate supports fast settling into 10pF capacitive loads. |
| V– | Negative power supply | Typically grounded; supports split supplies if |V+ – V–| remains 3.1V–5.25V; bypass required if floating. |
| +IN | Non-inverting input | Same voltage range as –IN; differential input resistance >1000GΩ ensures negligible loading on high-Z sources. |
Key Features
| Feature | Design Value |
|---|---|
| Femtoampere input bias | ±3fA typical at 25°C - preserves signal integrity in ultra-high-impedance photodiode and ion-sensor interfaces. |
| Ultra-low input capacitance | 450fF common-mode - reduces noise gain peaking and extends usable bandwidth in transimpedance configurations. |
| Rail-to-rail output | Swings within 140mV of rails at 10mA - maximizes dynamic range when driving 3.3V SAR ADCs with 0.5V–2.8V input range. |
| Low-noise spectral profile | 4.3nV/√Hz (1MHz) + 5.5fA/√Hz (100kHz) - enables optimal noise trade-off selection between en and in dominance in TIAs. |
| Fast shutdown control | 480ns turn-off / 580ns turn-on - supports duty-cycled optical sensing with minimal dead time in LIDAR and time-of-flight systems. |
Applications
| Photodiode Transimpedance Amplifier | SAR ADC Driver |
|---|---|
Use Scenario: Converting nanoampere photocurrent from low-capacitance silicon photodiodes into voltage for precision digitization. IC Role / Device Role / Timing Role: Primary transimpedance gain stage with 20kΩ–499kΩ feedback resistors and sub-pF parasitic capacitance management. Use Value: 350MHz bandwidth and 450fF CIN enable >65MHz closed-loop response with 20kΩ gain, verified in LTC reference design TA01. |
Use Scenario: Driving the input of 16-bit+ successive-approximation register (SAR) ADCs requiring fast settling and low THD+N. IC Role / Device Role / Timing Role: Buffer and level-shifter between high-impedance analog sources and switched-capacitor ADC inputs. Use Value: –100dB HD2/HD3 at 1MHz and 17ns 0.1% settling time ensure <1LSB error in 1MSPS sampling with 2VP-P signals. |
| CCD Output Buffer | Photomultiplier Tube Post-Amplifier |
Use Scenario: Amplifying low-current, high-impedance charge packets from scientific-grade CCD image sensors. IC Role / Device Role / Timing Role: Low-noise, high-speed output buffer isolating CCD pixel array from PCB trace capacitance and ADC loading. Use Value: 13µVP-P 0.1Hz–10Hz input-referred noise and 400V/µs slew rate support accurate reconstruction of fast CCD readout pulses. |
Use Scenario: Amplifying microampere-level anode currents from vacuum photomultiplier tubes in radiation detection and fluorescence lifetime systems. IC Role / Device Role / Timing Role: First-stage current-to-voltage converter with ultra-low IB and high GBW to preserve pulse fidelity. Use Value: ±3fA input bias prevents baseline drift during long integration windows; 500MHz GBW preserves sub-10ns PMT pulse rise times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-bias-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4817-1ARMZ | Lower GBW (1GHz), higher IB (2pA typ.), 1.3pF CIN, no shutdown | Better for wideband voltage amplification; unsuitable for <100kΩ TIA due to higher CIN and IB | Select when >500MHz small-signal bandwidth is required and femtoampere IB is not critical. |
| OPA858IDSGR | Higher IB (200fA typ.), lower noise (1.9nV/√Hz), 0.45pF CIN, no shutdown | Optimized for lowest voltage noise in medium-RF TIAs; lacks shutdown for power-gated systems | Select when 1.9nV/√Hz voltage noise dominates system noise budget and shutdown is unnecessary. |
Compared with ADA4817-1ARMZ and OPA858IDSGR, the LTC6268IS6#TRMPBF uniquely combines femtoampere input bias, 450fF input capacitance, and integrated shutdown in a 6-lead TSOT-23 - making it the only option for battery-powered, low-leakage optical front-ends requiring both precision and power efficiency.
Availability
LTC6268IS6#TRMPBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, SAR ADC drivers, and CCD output buffering requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC6268IS6#TRMPBF 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 belongs to ADI's ultra-low-input-bias-current op amp product line, engineered specifically for photonics, analytical instrumentation, and high-impedance sensor signal chains where leakage and capacitance directly limit resolution.
FAQ
What is the maximum operating temperature range for the LTC6268IS6#TRMPBF?
The LTC6268IS6#TRMPBF is specified for operation from –40°C to +85°C. This industrial-grade temperature range is confirmed in the "ORDER INFORMATION" table of the official datasheet, where the "I" grade suffix denotes this specification. It is not rated for the extended –40°C to +125°C range offered by the "H" grade variants like LTC6268HS6#TRMPBF.
Does the LTC6268IS6#TRMPBF require external compensation for unity-gain stability?
No, the LTC6268IS6#TRMPBF is internally compensated for stable unity-gain operation. The datasheet specifies a 350MHz –3dB bandwidth at AV = 1 and confirms stability under standard test conditions (RL = 1kΩ, CL = 10pF). No external compensation components are needed for basic buffer or inverting amplifier configurations.
What is the input voltage range of the LTC6268IS6#TRMPBF relative to its supply rails?
The LTC6268IS6#TRMPBF has an input voltage range from V– to V+ – 0.5V. For example, with V– = 0V and V+ = 5V, the valid input common-mode range is 0V to 4.5V. This is explicitly stated in the "PIN FUNCTIONS" section and guaranteed over the full –40°C to +85°C operating temperature range.
How does the shutdown feature affect output state in the LTC6268IS6#TRMPBF?
When the SHDN pin is pulled low (≤0.75V vs V–), the LTC6268IS6#TRMPBF enters shutdown mode and its output transitions to high-impedance (Hi-Z) within 480ns. The output does not clamp or short - it floats - allowing safe multiplexing or isolation in multi-channel systems without loading downstream circuitry.
Can the LTC6268IS6#TRMPBF drive a 100Ω load effectively?
The LTC6268IS6#TRMPBF is not designed to continuously drive 100Ω loads. Its absolute maximum output current is ±135mA, but sustained sourcing/sinking above 25mA risks exceeding junction temperature limits. Datasheet output swing specs (e.g., VOL = 200mV at ISINK = 25mA) confirm performance is characterized up to 25mA - use a buffer stage for 100Ω loads.
LTC6268IS6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- 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:
- 0.9 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 ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC6268IS6#TRMPBF FAQ
1.How can I place an order for LTC6268IS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6268IS6#TRMPBF 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 LTC6268IS6#TRMPBF reliable?
The price and inventory of LTC6268IS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6268IS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC6268IS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6268IS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6268IS6#TRMPBF?
LTC6268IS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6268IS6#TRMPBF 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 LTC6268IS6#TRMPBF?
For technical support, including LTC6268IS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6268IS6#TRMPBF requirements.
6.How does Aetrix verify that LTC6268IS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC6268IS6#TRMPBF 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 LTC6268IS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC6268IS6#TRMPBF?
All LTC6268IS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6268IS6#TRMPBF, 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 LTC6268IS6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC6268IS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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