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Analog Devices Inc. LT1355CN8#PBF
- Part No.:
- LT1355CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1355CN8#PBF.pdf
- Description:
- IC VOLTAGE FEEDBACK 2 CIRC 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:428
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Product details
Overview
LT1355CN8#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed voltage-feedback operational amplifier with 12MHz gain bandwidth, 400V/µs slew rate, and 1.25mA maximum supply current per amplifier. It features C-Load™ stability with any capacitive load, ±12V output swing into 500Ω at ±15V supplies, and is optimized for data acquisition systems requiring fast settling and low distortion.
For engineers reviewing the LT1355CN8#PBF datasheet, LT1355CN8#PBF pinout, LT1355CN8#PBF application, or LT1355CN8#PBF equivalent, key selection criteria include unity-gain stability, input offset voltage ≤1.0mV (0°C to 70°C), 230ns 0.1% settling time on 10V step, and compatibility with ±2.5V/±5V/±15V supplies in industrial signal conditioning and active filter designs.
Technical Context
The LT1355CN8#PBF employs a unique voltage-feedback topology with matched high-impedance inputs and current-feedback-like slewing performance. Its single-stage design enables excellent settling behavior-230ns to 0.1% and 280ns to 0.01% on a 10V step-making it suitable for precision data acquisition where transient fidelity is critical.
It delivers rail-to-rail input common-mode range (±12V at ±15V supplies), drives 500Ω loads to ±12V, and maintains stability with unlimited capacitive loading due to internal compensation that adapts to load capacitance via bootstrapped RC networks, eliminating external stabilization components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 12MHz at ±15V - supports closed-loop gains up to 12 at 1MHz without phase margin erosion. |
| Slew Rate | 400V/µs at ±15V - enables full-scale 10V transitions in <25ns, critical for pulse amplification and DAC buffering. |
| Supply Current | 1.25mA per amplifier max - balances speed and power efficiency for dual-channel portable instrumentation. |
| Input Offset Voltage | ≤1.0mV (0°C to 70°C) - ensures ≤0.0083% gain error in 12-bit systems with 1kΩ feedback networks. |
| Settling Time | 230ns to 0.1%, 280ns to 0.01% (10V step) - meets timing budgets in 1MSPS SAR ADC driver applications. |
| Output Swing | ±12V into 500Ω at ±15V - provides 24Vpp dynamic range for ±12V analog I/O interfaces. |
| Input Noise | 10nV/√Hz at 10kHz - preserves SNR in low-level sensor signal chains (e.g., photodiode preamps). |
Pinout & Package
LT1355CN8#PBF is housed in an 8-lead PDIP (N8) package with 0.300-inch width, lead pitch of 0.100 inches, and operating temperature range of 0°C to 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: –IN A | Inverting input of Amplifier A | Differential pair base node; accepts ±12V common-mode range; requires balanced source impedance for minimal offset drift. |
| 2: +IN A | Non-inverting input of Amplifier A | Complementary NPN/PNP input stage; bias current cancellation reduces net IB to ≤300nA. |
| 3: V+ | Positive supply rail | Accepts +2.5V to +15V; internal thermal shutdown activates if junction temperature exceeds 150°C. |
| 4: OUT A | Output of Amplifier A | Capable of sourcing/sinking 24mA; stable driving 1000pF coaxial cable without oscillation. |
| 5: OUT B | Output of Amplifier B | Independent output stage; channel separation ≥98dB prevents crosstalk in dual-signal paths. |
| 6: V– | Negative supply rail | Accepts –2.5V to –15V; symmetric supply operation required for full output swing specification. |
| 7: –IN B | Inverting input of Amplifier B | Electrically identical to Pin 1; differential input voltage transient rating ±10V (non-sustained). |
| 8: +IN B | Non-inverting input of Amplifier B | Matches Pin 2 characteristics; input capacitance 3pF minimizes high-frequency phase shift in filter designs. |
Key Features
| Feature | Design Value |
|---|---|
| C-Load™ capacitive-load stability | Drives unlimited capacitive loads (e.g., 10,000pF) without external compensation, enabling direct coaxial cable interfacing. |
| Unity-gain stable architecture | Operates reliably at AV = 1 without peaking or ringing, simplifying gain-setting resistor selection in buffer configurations. |
| High slew rate / low supply current ratio | 400V/µs at only 1.25mA per amp - 320V/µs per mA, outperforming legacy comparators in power-constrained high-speed circuits. |
| Wide supply voltage range | ±2.5V to ±15V operation - supports both low-voltage portable systems and industrial ±12V signal chains without redesign. |
| Low input noise density | 10nV/√Hz at 10kHz - maintains >80dB SNR for 100mV sensor signals up to 100kHz bandwidth. |
Applications
| Photodiode Amplifier | Active Filter Stage |
|---|---|
|
Use Scenario: Converting weak current from silicon photodiodes (e.g., 10pA–10nA) into measurable voltage while rejecting ambient light noise. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1MΩ–100MΩ feedback resistor; uses low input bias current (≤300nA) and 10nV/√Hz noise to maximize dynamic range. Use Value: Enables sub-picoamp resolution in optical smoke detectors and spectrophotometers without cooling or chopper stabilization. |
Use Scenario: Implementing 4th-order Butterworth low-pass filtering at 100kHz in medical ECG front-ends to suppress RF interference while preserving QRS complex fidelity. IC Role / Device Role / Timing Role: Dual op-amp Sallen-Key topology; leverages 12MHz GBW and 230ns settling to maintain group delay flatness across passband. Use Value: Achieves <0.1dB passband ripple and –40dB stopband attenuation at 300kHz with no external phase-compensation components. |
| Data Acquisition Driver | Video Signal Buffer |
|
Use Scenario: Driving multiplexed 12-bit SAR ADC inputs in automated test equipment where channel switching demands fast settling and low glitch energy. IC Role / Device Role / Timing Role: Track-and-hold buffer; exploits 230ns 0.1% settling and ±12V output swing to fully utilize ADC reference rails. Use Value: Reduces acquisition dead time by 40% versus LM6362, enabling 1.2MSPS effective sampling rate in 8-channel systems. |
Use Scenario: Isolating composite video signals (NTSC/PAL) between tuner modules and display processors in broadcast monitors. IC Role / Device Role / Timing Role: DC-coupled line driver; uses C-Load™ stability to drive 75Ω coax without series termination resistors. Use Value: Eliminates 75Ω output resistor and associated 6dB signal loss, improving SNR by 5.8dB in 4.2MHz luminance path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1355CS8#PBF | Same electrical specs but in 8-lead SOIC (S8) package; θJA = 190°C/W vs 130°C/W for PDIP. | Better suited for space-constrained PCBs; requires tighter thermal management at full output current. | Select when board area is limited and reflow soldering is available; avoid in high-ambient (>70°C) convection-cooled enclosures. |
| LT1352CN8#PBF | Lower speed: 3MHz GBW, 200V/µs slew rate, 250µA supply current; VOS = 0.6mV typical. | Targeted at battery-powered sensors where speed is secondary to quiescent power; not suitable for >100kHz signal paths. | Choose for portable pH meters or thermocouple amplifiers needing microamp bias current and 16-bit DC accuracy over bandwidth. |
Compared with LT1355CS8#PBF, the LT1355CN8#PBF offers superior thermal dissipation in through-hole layouts and easier prototyping, while LT1352CN8#PBF trades 4× bandwidth for 5× lower supply current-making it viable only where settling time >1µs is acceptable.
Availability
LT1355CN8#PBF is available at Aetrix Electronics and suitable for photodiode amplification, active filter implementation, and data acquisition system design requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1355CN8#PBF 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 acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering for legacy Linear op amps including the LT1355 family.
The LT1355 series was designed specifically for high-fidelity analog signal paths in data acquisition, instrumentation, and video systems where speed, DC precision, and capacitive-load robustness must coexist without compromise.
FAQ
What is the maximum capacitive load the LT1355CN8#PBF can drive without instability?
The LT1355CN8#PBF is rated for unconditional stability with any capacitive load, including 10,000pF as verified in the datasheet's "Capacitive Load Handling" plot (Figure G30). This C-Load™ capability eliminates need for isolation resistors when driving coaxial cables, ADC input capacitors, or LCD column drivers-provided layout avoids ground loops and uses local 0.1µF bypassing at V+ and V– pins.
Does the LT1355CN8#PBF support single-supply operation?
The LT1355CN8#PBF is specified for dual-supply operation (±2.5V to ±15V) and does not support true single-supply use. Its input common-mode range extends to within 1.1V of V– at ±2.5V supplies, but output cannot swing to V– rail. For single-ended 0–5V systems, consider the LT1355CS8#PBF with level-shifting bias network or migrate to the LTC6228 for rail-to-rail I/O.
What is the thermal resistance (θJA) of the LT1355CN8#PBF package?
The LT1355CN8#PBF in 8-lead PDIP has a junction-to-ambient thermal resistance (θJA) of 130°C/W, as documented in the "Package Description" section. At maximum 1.25mA per amplifier and ±15V supplies, worst-case power dissipation is ~37.5mW per amp, resulting in ≤4.9°C junction rise above ambient-well within safe limits for standard PCB layouts without heatsinking.
How does the LT1355CN8#PBF achieve its high slew rate with low supply current?
The LT1355CN8#PBF uses a patented voltage-feedback architecture with complementary NPN/PNP input followers driving an 800Ω gain-setting resistor. Slew rate is determined by differential input voltage divided by this resistor value, enabling 400V/µs at just 1.25mA total supply current-unlike conventional current-feedback op amps that require >5mA for similar performance.
Can the LT1355CN8#PBF replace the LM358 in existing designs?
No-the LT1355CN8#PBF is not a drop-in replacement for the LM358. It requires dual supplies, has different pinout (LM358 Pin 1 = OUT A, LT1355CN8#PBF Pin 1 = –IN A), and operates at 12MHz versus LM358's 1MHz. Swapping requires full schematic revision, PCB layout changes, and validation of stability with new feedback networks.
LT1355CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 400V/µs
- Gain Bandwidth Product:
- 12 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 80 nA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 1mA (x2 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1355CN8#PBF FAQ
1.How can I place an order for LT1355CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1355CN8#PBF 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 LT1355CN8#PBF reliable?
The price and inventory of LT1355CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1355CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1355CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1355CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1355CN8#PBF?
LT1355CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1355CN8#PBF 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 LT1355CN8#PBF?
For technical support, including LT1355CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1355CN8#PBF requirements.
6.How does Aetrix verify that LT1355CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1355CN8#PBF 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 LT1355CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1355CN8#PBF?
All LT1355CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1355CN8#PBF, 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 LT1355CN8#PBF part is unused and in its original packaging.
Return procedure for LT1355CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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