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Analog Devices Inc. LTC6268IS6#TRPBF
- Part No.:
- LTC6268IS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC6268IS6#TRPBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,113
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Product details
Overview
LTC6268IS6#TRPBF from Analog Devices (formerly Linear Technology) is a single-channel, ultra-low input bias current (±3 fA typ.), 500 MHz gain-bandwidth FET-input operational amplifier in a 6-lead TSOT-23 package. It delivers rail-to-rail output swing, 400 V/µs slew rate, and 450 fF common-mode input capacitance - optimized for transimpedance amplifiers in photodiode and PMT sensor interfaces requiring minimal leakage and high-speed signal integrity.
For engineers reviewing the LTC6268IS6#TRPBF datasheet, LTC6268IS6#TRPBF pinout, LTC6268IS6#TRPBF application, or LTC6268IS6#TRPBF equivalent, key selection criteria include verified fA-level input bias current at 125°C, confirmed 350 MHz –3 dB bandwidth at unity gain, documented 4.3 nV/√Hz voltage noise at 1 MHz, validated shutdown functionality with 580 ns turn-on time, and guaranteed operation across –40°C to 85°C.
Technical Context
The LTC6268IS6#TRPBF employs a CMOS input buffer stage that bootstraps ESD protection diodes to suppress leakage, enabling its ±3 fA typical input bias current. Its complementary differential input stage operates across two overlapping common-mode ranges - one active up to ~1.55 V below V+, the other extending to within 0.5 V of V+ - ensuring consistent performance across full rail-to-rail input voltage range.
Internal compensation ensures stability with capacitive loads up to 10 pF while maintaining 350 MHz closed-loop bandwidth at AV = 1. The shutdown pin (SHDN) controls a low-leakage enable path, reducing quiescent current to 0.39 mA (typ.) without compromising output high-Z isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 500 MHz - enables stable unity-gain configurations up to 350 MHz and supports high-speed ADC driving with minimal phase lag. |
| Input Bias Current | ±3 fA (typ.) at 25°C - preserves signal integrity in >1 GΩ source impedance circuits like photodiode TIAs and electrophysiology sensors. |
| Input Capacitance | 450 fF (common-mode) - minimizes feedback pole formation in transimpedance designs, allowing higher RF values before stability degradation. |
| Slew Rate | 400 V/µs - supports fast settling of large-signal transients in pulse-amplification applications without slew-induced distortion. |
| Supply Range | 3.1 V to 5.25 V - compatible with standard 3.3 V and 5 V logic rails; enables direct interface with SAR ADC references and digital controllers. |
| Operating Temp Range | –40°C to 85°C - qualified for industrial-grade embedded sensing and instrumentation without derating. |
| Shutdown Current | 0.39 mA (typ.) - reduces system power by >97% during idle periods in battery-powered optical front-ends. |
Pinout & Package
The LTC6268IS6#TRPBF is housed in a 6-lead plastic TSOT-23 package (0.95 mm × 1.6 mm footprint) with exposed pad thermal enhancement. Pin 1 is marked via laser scribe; no internal die attach paddle connection is required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts 3.1 V to 5.25 V; requires local 0.1 µF ceramic bypass to ground for high-frequency PSRR maintenance. |
| SHDN | Active-low shutdown control | Drives amplifier into high-Z output state when ≤0.75 V; unconnected = enabled; 1.5 V threshold guarantees robust noise immunity. |
| –IN | Inverting input | Valid input range: V– to V+ – 0.5 V; low 450 fF capacitance enables stable TIA configurations with <1 pF parasitic feedback paths. |
| OUT | Amplifier output | Rail-to-rail swing (within 140 mV of rails at 10 mA); capable of sourcing/sinking 135 mA peak for transient load handling. |
| V– | Negative supply input | Typically grounded; supports split supplies if total V+–V– remains 3.1–5.25 V; requires 0.1 µF bypass if not at ground potential. |
| +IN | Non-inverting input | Same voltage range and leakage specs as –IN; differential input resistance >1000 GΩ ensures negligible loading on high-Z sources. |
Key Features
| Feature | Design Value |
|---|---|
| FET input architecture | Enables ±3 fA input bias current at room temperature - critical for preserving signal fidelity in femtoampere-level photodiode currents. |
| Low input capacitance | 450 fF common-mode input capacitance minimizes gain peaking and phase margin loss in transimpedance amplifier topologies. |
| Rail-to-rail output | Delivers full dynamic range utilization with 140 mV headroom at 10 mA load - maximizes SNR in single-supply 3.3 V systems interfacing to 12-bit+ SAR ADCs. |
| Ultra-low voltage noise | 4.3 nV/√Hz at 1 MHz - dominates noise budget only above 80 kHz, enabling optimal noise shaping in wideband optical receivers. |
| Fast shutdown recovery | 580 ns turn-on delay ensures rapid reactivation in time-multiplexed sensor arrays without sacrificing settling accuracy. |
Applications
| Photodiode Transimpedance Amplifier | High-Speed SAR ADC Driver |
|---|---|
Use Scenario: Amplifying weak current signals from silicon photodiodes in LIDAR or spectrophotometer front-ends. IC Role / Device Role / Timing Role: Primary transimpedance gain stage converting photocurrent to voltage with minimal added noise and leakage. Use Value: ±3 fA input bias current prevents DC offset drift in >100 kΩ feedback resistor configurations; 450 fF CIN enables stable 20 kΩ TIA designs at 65 MHz bandwidth. | Use Scenario: Driving the analog input of 16-bit, 5 MSPS SAR ADCs in precision data acquisition systems. IC Role / Device Role / Timing Role: Buffer and level-shifter delivering fast-settling, low-distortion signals to ADC sample-and-hold inputs. Use Value: –100 dB harmonic distortion at 1 MHz ensures <0.001% THD+N; 400 V/µs slew rate achieves 17 ns 0.1% settling for 3 V step transitions. |
| CCD Output Buffer | PMT Post-Amplifier |
Use Scenario: Conditioning low-current, high-impedance analog outputs from interline-transfer CCD image sensors. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth buffer isolating CCD pixel charge packets from downstream digitization circuitry. Use Value: 5.5 fA/√Hz current noise at 100 kHz avoids degrading CCD read noise floor; 350 MHz –3 dB bandwidth supports >20 MSPS pixel clock rates. | Use Scenario: Amplifying microampere-level anode pulses from photomultiplier tubes in radiation detection or fluorescence lifetime systems. IC Role / Device Role / Timing Role: Fast, low-leakage post-amplifier preserving pulse amplitude and timing fidelity in time-of-flight measurements. Use Value: 400 V/µs slew rate resolves sub-10 ns PMT rise times; rail-to-rail output swing maximizes dynamic range for pulse height analysis. |
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 |
|---|---|---|---|
| ADA4817-1ARMZ | Higher input bias current (2 pA typ.), lower GBW (1 GHz), no shutdown pin, 8-lead MSOP package | Better suited for ultra-high-speed voltage-feedback applications where bias current >1 pA is acceptable | Select ADA4817-1ARMZ only when >1 GHz bandwidth is required and fA-level leakage is unnecessary |
| OPA828IDBVR | Lower voltage noise (1.8 nV/√Hz), higher input bias current (10 pA typ.), no shutdown, 5-lead SOT-23 package | Preferred for low-noise, medium-impedance (<10 MΩ) sensor interfaces where speed >300 MHz is secondary | Choose OPA828IDBVR when voltage noise dominates system noise budget and shutdown functionality is not needed |
Compared with ADA4817-1ARMZ and OPA828IDBVR, the LTC6268IS6#TRPBF uniquely combines femtoampere input bias current, integrated shutdown, and 6-lead TSOT-23 packaging - making it the only option among the three qualified for low-leakage, space-constrained, power-gated optical front-ends.
Availability
LTC6268IS6#TRPBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, high-speed SAR ADC drivers, and CCD output buffering requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC6268IS6#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 precision instrumentation, communications, and industrial markets.
The LTC6268 product line was designed specifically for ultra-low-leakage, high-bandwidth signal conditioning in optical, scientific, and medical sensor interfaces - emphasizing fA-level input bias current, sub-pF input capacitance, and rail-to-rail output drive.
FAQ
What is the maximum operating temperature range for the LTC6268IS6#TRPBF?
The LTC6268IS6#TRPBF is specified over the –40°C to +85°C industrial temperature range. This grade is denoted by the "I" suffix in the part number and is fully tested and guaranteed across this range for parameters including input bias current, gain-bandwidth product, and output swing. It is not rated for the extended –40°C to +125°C "H-grade" range offered by the LTC6268HS6#TRPBF variant.
Does the LTC6268IS6#TRPBF require external compensation for stability in transimpedance amplifier configurations?
No, the LTC6268IS6#TRPBF features internally compensated architecture optimized for unity-gain stability. However, in transimpedance amplifier (TIA) applications, external feedback capacitance (CF) is often required to counteract parasitic input capacitance (CIN) and ensure adequate phase margin. The datasheet provides CF design guidelines - e.g., 0.25 pF for 10 kΩ RF with 1 pF CIN - to achieve stable 65 MHz bandwidth in a 20 kΩ TIA.
Can the LTC6268IS6#TRPBF be used with a single 3.3 V supply?
Yes, the LTC6268IS6#TRPBF operates from 3.1 V to 5.25 V total supply voltage, making it fully compatible with standard 3.3 V systems. At 3.3 V, it maintains 350 MHz –3 dB bandwidth, 4.3 nV/√Hz voltage noise, and rail-to-rail output swing (within 140 mV of each rail at 10 mA). Input common-mode range extends from V– to V+ – 0.5 V, supporting true single-supply operation with ground-referenced inputs.
How does the shutdown feature of the LTC6268IS6#TRPBF affect output state and leakage?
When the SHDN pin is pulled ≤0.75 V, the LTC6268IS6#TRPBF disables its output stage and places the OUT pin in high-impedance (high-Z) state. Output leakage in shutdown is limited to ±400 nA (max) at VOUT = 0 V or 5 V. The amplifier consumes only 0.39 mA (typ.) per channel in shutdown - a >97% reduction from its 16.5 mA active quiescent current - enabling effective power gating in duty-cycled optical receivers.
Is the LTC6268IS6#TRPBF pin-compatible with other members of the LTC6268/LTC6269 family?
No, the LTC6268IS6#TRPBF in the 6-lead TSOT-23 package is not pin-compatible with the 8-lead SOIC (LTC6268IS8#TRPBF) or dual-channel LTC6269 variants. Its pinout - V+, SHDN, –IN, OUT, V–, +IN - is unique to the S6 package. Board layout must be dedicated to the TSOT-23 footprint; migration to SOIC or MSOP packages requires PCB redesign and signal routing changes.
LTC6268IS6#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC6268IS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6268IS6#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 LTC6268IS6#TRPBF reliable?
The price and inventory of LTC6268IS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6268IS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6268IS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6268IS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6268IS6#TRPBF?
LTC6268IS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6268IS6#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 LTC6268IS6#TRPBF?
For technical support, including LTC6268IS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6268IS6#TRPBF requirements.
6.How does Aetrix verify that LTC6268IS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6268IS6#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 LTC6268IS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6268IS6#TRPBF?
All LTC6268IS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6268IS6#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 LTC6268IS6#TRPBF part is unused and in its original packaging.
Return procedure for LTC6268IS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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