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Analog Devices Inc. LTC6268IS6-10#TRPBF
- Part No.:
- LTC6268IS6-10#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC6268IS6-10#TRPBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT TSOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC6268IS6-10#TRPBF from Analog Devices (formerly Linear Technology) is a single-channel, decompensated FET-input operational amplifier optimized for ultra-low input bias current (±3 fA typ. at 25°C), 0.45 pF common-mode input capacitance, and 4 GHz gain-bandwidth product. It operates from 3.1 V to 5.25 V, delivers rail-to-rail output swing, and is gain-of-10 stable - making it ideal for high-speed transimpedance amplifiers in photodiode and photomultiplier tube signal chains.
For engineers reviewing the LTC6268IS6-10#TRPBF datasheet, LTC6268IS6-10#TRPBF pinout, LTC6268IS6-10#TRPBF application, or LTC6268IS6-10#TRPBF equivalent, key selection criteria include femtoamp-level input bias current stability over temperature, sub-0.5 pF input capacitance for TIA bandwidth optimization, shutdown functionality with 360 ns turn-on time, and compatibility with low-noise, high-impedance sensor front-ends requiring minimal board leakage interference.
Technical Context
The LTC6268IS6-10#TRPBF employs a CMOS input buffer stage that bootstraps protection diodes to suppress leakage, enabling ±3 fA typical input bias current. Its complementary differential input pair covers the full input common-mode range (–0.1 V to 4.5 V on 5 V supply), with active switching between PNP- and NPN-dominated regions to maintain linearity and CMRR > 68 dB across voltage and temperature.
As a decompensated op amp, it requires minimum noise gain of 10 for stability and achieves 210 MHz transimpedance bandwidth with 20 kΩ feedback. Its 4.0 nV/√Hz voltage noise at 1 MHz and 7 fA/√Hz current noise at 100 kHz are balanced for optimal SNR in wideband, high-Z current-to-voltage conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 4 GHz - enables stable gain-of-10 operation with >200 MHz closed-loop bandwidth in TIA configurations. |
| Input Bias Current | ±3 fA (typ., 25°C); ≤4 pA (max., 125°C) - preserves signal integrity in femtoamp photodiode and ion-sensor applications. |
| Input Capacitance | 0.45 pF (common-mode) - minimizes pole formation with feedback resistor, critical for maximizing TIA bandwidth. |
| Slew Rate | +1500 V/µs / –1000 V/µs - supports fast large-signal settling in pulsed optical detection systems. |
| Supply Range | 3.1 V to 5.25 V - compatible with standard 3.3 V and 5 V rails; supports split-supply operation if V+ – V– stays within range. |
| Shutdown Current | 0.39–1.5 mA (per amp) - reduces power during idle periods without compromising wake-up latency (360 ns tON). |
| Operating Temp | –40°C to 85°C - qualified for industrial and instrumentation environments; H-grade variant extends to 125°C. |
Pinout & Package
The LTC6268IS6-10#TRPBF is housed in a 6-lead TSOT-23 package (S6), with exposed pad not connected internally. Pin 1 (V+) supplies positive rail; Pin 2 (SHDN) enables low-power mode when pulled below 0.75 V; Pins 3 (–IN) and 6 (+IN) form the high-impedance FET input pair; Pin 4 (OUT) delivers rail-to-rail output; Pin 5 (V–) is the negative supply reference (typically ground). No NC pins - all six terminals are functional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive power supply input | Accepts 3.1–5.25 V; requires local 0.1 µF bypass capacitor to minimize supply-induced noise coupling. |
| SHDN | Active-low shutdown control | Pull ≤0.75 V to disable amplifier; floating or ≥1.5 V enables operation; draws <12 µA in either state. |
| –IN | Inverting input terminal | High-impedance FET node (RIN >1 TΩ); voltage range: V– to V+ – 0.5 V; sensitive to PCB leakage - guard ring recommended. |
| OUT | Amplifier output | Rail-to-rail swing (e.g., 80 mV above V– and 70 mV below V+ at 10 mA load); capable of 135 mA peak sourcing/sinking. |
| V– | Negative power supply reference | Typically grounded; supports split supplies as long as total V+–V– remains 3.1–5.25 V; bypass to ground with 0.1 µF. |
| +IN | Non-inverting input terminal | Matches –IN in impedance and leakage; identical common-mode range and ESD protection structure. |
Key Features
| Feature | Design Value |
|---|---|
| Femtoamp input bias current | ±3 fA typ. at 25°C ensures minimal error in high-impedance current measurement circuits (e.g., photodiode amps). |
| Ultra-low input capacitance | 0.45 pF common-mode capacitance directly limits TIA bandwidth degradation - enables >200 MHz BW with 20 kΩ RF. |
| Gain-of-10 stability | Decompensated architecture eliminates need for external compensation in fixed-gain ≥10 designs, simplifying layout. |
| Rail-to-rail output | Swings within 70–200 mV of either rail under 10–25 mA load, maximizing dynamic range in single-supply systems. |
| Integrated shutdown | 360 ns turn-on / 183 ns turn-off delays allow rapid power cycling in burst-mode optical receivers without signal loss. |
Applications
| Photodiode Transimpedance Amplifier | Photomultiplier Tube (PMT) Post-Amplifier |
|---|---|
|
Use Scenario: Converting weak photocurrents (fA–nA) from silicon or InGaAs photodiodes into measurable voltage signals in optical communications and spectroscopy. IC Role / Device Role / Timing Role: Primary current-to-voltage converter with gain set by feedback resistor; sets system bandwidth and noise floor. Use Value: 0.45 pF CIN and ±3 fA IB enable >210 MHz bandwidth at 20 kΩ gain while preserving SNR in low-light conditions. |
Use Scenario: Amplifying fast, low-current pulses (ns rise time) from PMTs used in radiation detection, mass spectrometry, and time-of-flight measurements. IC Role / Device Role / Timing Role: High-speed, low-noise post-amplifier following PMT anode; handles transient currents without saturation or droop. Use Value: +1500 V/µs slew rate and 4 GHz GBW support clean amplification of sub-10 ns pulses with minimal overshoot or ringing. |
| Low-IBIAS Precision Instrumentation | High-Speed ADC Driver |
|
Use Scenario: Front-end amplification in femtoamp electrometers, ion-selective electrode interfaces, and electrochemical sensors where leakage dominates error. IC Role / Device Role / Timing Role: Input-stage buffer isolating ultra-high-impedance source from downstream circuitry; defines input offset drift and long-term stability. Use Value: 4 µV/°C VOS drift and >1 TΩ input resistance prevent thermal and parasitic errors in DC-coupled precision measurement paths. |
Use Scenario: Driving SAR or pipeline ADC inputs in high-frequency data acquisition systems requiring low distortion and fast settling. IC Role / Device Role / Timing Role: Gain block and buffer ensuring full-scale step response settles to 16-bit accuracy within nanoseconds before ADC sampling. Use Value: –91 dB HD2/–96 dB HD3 at 10 MHz and 2 VP–P ensures minimal harmonic contamination in wideband digitization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-input-bias-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4817-1ARMZ-R7 | 2.3 GHz GBW; 2.5 fA IB; 0.75 pF CIN; unity-gain stable; no shutdown. | Better IB but higher CIN limits TIA bandwidth; lacks shutdown for power-gated systems. | Select when unity-gain stability is mandatory and femtoamp leakage is more critical than bandwidth. |
| OPA855IDSGT | 8 GHz GBW; 1.4 fA IB; 0.65 pF CIN; gain-of-6 stable; integrated RF compensation. | Higher bandwidth and lower IB, but requires external compensation network for gain-of-10; larger 8-pin WSON package. | Select when >300 MHz TIA bandwidth is required and board space allows for compensation components. |
Compared with ADA4817-1ARMZ-R7 and OPA855IDSGT, the LTC6268IS6-10#TRPBF offers the best balance of guaranteed gain-of-10 stability, lowest CIN for maximum TIA bandwidth, and integrated shutdown - making it uniquely suited for compact, battery-aware, high-bandwidth photodetection modules.
Availability
LTC6268IS6-10#TRPBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, PMT post-amplifiers, and low-IBIAS precision instrumentation requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC6268IS6-10#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 LTC6268-10 series was developed by Linear Technology (acquired by ADI in 2017) specifically for ultra-low-noise, ultra-low-bias-current amplification in photonics and scientific instrumentation - prioritizing femtoamp leakage control, sub-picofarad input capacitance, and GHz-class speed in miniature packages.
FAQ
What is the minimum stable gain for LTC6268IS6-10#TRPBF?
The LTC6268IS6-10#TRPBF is decompensated and specified as gain-of-10 stable. It must be operated with noise gain ≥10 (e.g., non-inverting gain ≥10 or inverting gain magnitude ≥9) to ensure phase margin >45° and avoid oscillation. Using it at lower gains requires external compensation.
Does LTC6268IS6-10#TRPBF support split-supply operation?
Yes - LTC6268IS6-10#TRPBF supports split supplies as long as the total voltage difference between V+ and V– remains within 3.1 V to 5.25 V. For example, ±2.5 V (5 V total) is valid; input common-mode range extends from V– to V+ – 0.5 V, and output swings rail-to-rail relative to V– and V+.
How does the SHDN pin behave when left unconnected?
When the SHDN pin of LTC6268IS6-10#TRPBF is left unconnected, the amplifier remains fully enabled. The internal pull-up ensures VIH > 1.5 V, satisfying the enable threshold. No external pull-up is required, though a 100 kΩ resistor to V+ may improve noise immunity in high-EMI environments.
Can LTC6268IS6-10#TRPBF drive capacitive loads directly?
LTC6268IS6-10#TRPBF is not optimized for direct capacitive loading. Driving >10 pF without isolation risks instability due to phase shift. For ADC driving or cable termination, use a small series resistor (10–50 Ω) between OUT and the load, or add a unity-gain buffer stage to preserve bandwidth and settle time.
What is the maximum input common-mode voltage for LTC6268IS6-10#TRPBF on a 5 V supply?
On a 5 V supply (V+ = 5 V, V– = 0 V), the guaranteed input common-mode voltage range for LTC6268IS6-10#TRPBF is –0.1 V to 4.5 V - i.e., up to 0.5 V below V+. This is enforced by CMRR specification and applies across the full –40°C to 85°C operating temperature range.
LTC6268IS6-10#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:
- 1500V/µs
- Gain Bandwidth Product:
- 4 GHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.003 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 16.5mA
- Current - Output / Channel:
- 90 mA
- 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
LTC6268IS6-10#TRPBF FAQ
1.How can I place an order for LTC6268IS6-10#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6268IS6-10#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 LTC6268IS6-10#TRPBF reliable?
The price and inventory of LTC6268IS6-10#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6268IS6-10#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6268IS6-10#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6268IS6-10#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6268IS6-10#TRPBF?
LTC6268IS6-10#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6268IS6-10#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 LTC6268IS6-10#TRPBF?
For technical support, including LTC6268IS6-10#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6268IS6-10#TRPBF requirements.
6.How does Aetrix verify that LTC6268IS6-10#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6268IS6-10#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 LTC6268IS6-10#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6268IS6-10#TRPBF?
All LTC6268IS6-10#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6268IS6-10#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 LTC6268IS6-10#TRPBF part is unused and in its original packaging.
Return procedure for LTC6268IS6-10#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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