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Analog Devices Inc. LT1226CN8#PBF
- Part No.:
- LT1226CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1226CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:227
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Product details
Overview
LT1226CN8#PBF from Analog Devices (formerly Linear Technology) is a low-noise, very high-speed voltage-feedback operational amplifier optimized for gain-of-25 stable operation. It delivers 1 GHz gain bandwidth, 400 V/µs slew rate, 2.6 nV/√Hz input noise voltage, and ±12 V output swing into 500 Ω with ±15 V supplies - making it ideal for precision data acquisition systems requiring fast settling and wideband signal conditioning.
For engineers reviewing the LT1226CN8#PBF datasheet, LT1226CN8#PBF pinout, LT1226CN8#PBF application, or LT1226CN8#PBF equivalent, key selection criteria include its guaranteed stability at noise gain ≥25, capacitive-load drive capability, DC accuracy (≤1 mV VOS), and operation across ±2.5 V to ±15 V supplies in industrial temperature range (0°C to 70°C).
Technical Context
The LT1226CN8#PBF employs a single-stage bipolar complementary architecture enabling both high DC gain (≥50 V/mV at RL = 500 Ω) and exceptional transient response (100 ns to 0.1% for 10 V step). Its internal compensation ensures unconditional stability at noise gain ≥25, eliminating need for external compensation in standard configurations.
It features rail-to-rail input common-mode range (±12 V to ±13 V), low input bias current (4–8 µA), and robust output stage capable of sourcing/sinking ≥24 mA while driving all capacitive loads - critical for cable driver and active filter applications where phase margin degradation must be avoided.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 1 GHz - enables >40 MHz small-signal bandwidth at AV = +25 with peaking tolerance. |
| Slew Rate | 400 V/µs - supports full-power 10 V step settling in ≤100 ns without slewing distortion. |
| Input Noise Voltage | 2.6 nV/√Hz at 10 kHz - preserves SNR in photodiode preamplifiers and RF signal chains. |
| DC Open-Loop Gain | 50 V/mV min into 500 Ω - ensures <100 µV error in precision gain stages with feedback resistors ≤5 kΩ. |
| Input Offset Voltage | 1.0 mV max - meets accuracy requirements for 12-bit data acquisition systems at room temperature. |
| Supply Voltage Range | ±2.5 V to ±15 V - supports dual-supply operation in legacy industrial and test equipment designs. |
| Output Swing | ±12.0 V min into 500 Ω on ±15 V - delivers full dynamic range without clipping in video buffer stages. |
| Settling Time | 100 ns to 0.1% for 10 V step - satisfies sampling timing budgets in 10 MSPS ADC drivers. |
Pinout & Package
LT1226CN8#PBF is housed in an 8-lead plastic DIP (N8 package) with 0.300-inch width, JEDEC MS-001 compliant footprint, and 150°C maximum junction temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | Null Offset Adjust | Connect external 10 kΩ potentiometer wiper to Pin 1 and ends to Pins 1/8 for VOS trimming; unused pins left open. |
| 2 | Inverting Input (–IN) | Differential input node; requires matched source impedance to Pin 3 for optimal CMRR and DC accuracy. |
| 3 | Non-Inverting Input (+IN) | Differential input node; input common-mode range extends to ±13 V on ±15 V supplies. |
| 4 | Negative Supply (V–) | Return path for bias and output current; requires local 0.01–0.1 µF RF bypass capacitor. |
| 5 | Output (OUT) | Class-AB output stage capable of ±24 mA into 500 Ω; stable with ≥1000 pF capacitive load. |
| 6 | Positive Supply (V+) | Power rail; requires local 0.01–0.1 µF RF bypass and 1–10 µF bulk tantalum capacitor for high-current transients. |
| 7 | NC | No internal connection; electrically isolated - must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Gain-of-25 Stability | Guaranteed stable without external compensation when noise gain ≥25 - eliminates design risk in high-speed gain blocks. |
| Capacitive Load Drive | Unconditionally stable up to 10,000 pF - enables direct coaxial cable driving without isolation resistors. |
| Low Input Noise | 2.6 nV/√Hz at 10 kHz - maintains signal integrity in photodiode and sensor preamplifier front-ends. |
| Fast Settling | 100 ns to 0.1% for 10 V step - meets timing constraints in multiplexed data acquisition and pulse amplification. |
| Wide Supply Range | Operates from ±2.5 V to ±15 V - allows reuse across legacy ±5 V, ±12 V, and modern low-voltage systems. |
Applications
| Photodiode Preamplifier | Video Cable Driver |
|---|---|
Use Scenario: Amplifying weak current signals from silicon photodiodes in spectrometry and medical imaging systems. IC Role / Device Role / Timing Role: Transimpedance amplifier with AV = +25 and 15 MHz bandwidth per typical application TA01. Use Value: 2.6 nV/√Hz input noise and 100 ns settling preserve low-light SNR and frame-rate timing accuracy. | Use Scenario: Driving 75 Ω coaxial video cables in broadcast equipment and test instrumentation. IC Role / Device Role / Timing Role: Unity-gain buffer with double termination (series resistor + 75 Ω load) per TA05. Use Value: Full ±12 V swing into 500 Ω and capacitive-load stability ensure pulse fidelity without overshoot or ringing. |
| Data Acquisition Front-End | Active Filter Stage |
Use Scenario: Signal conditioning prior to 12-bit SAR ADCs in automated test equipment. IC Role / Device Role / Timing Role: High-speed gain stage with 0.1% settling in 100 ns for 10 V full-scale steps. Use Value: 400 V/µs slew rate and 1 GHz GBW prevent aperture uncertainty and harmonic distortion. | Use Scenario: 4th-order Butterworth low-pass filtering at 10–20 MHz in RF receiver IF chains. IC Role / Device Role / Timing Role: Dual-opamp topology implementing Sallen-Key or MFB configuration with AV = –24. Use Value: Gain-of-25 stability and 100% phase margin at closed-loop gains ≥25 ensure monotonic frequency response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD847JRZ-REEL7 | Lower GBW (50 MHz), higher VOS (1.5 mV max), SOIC-8 only - no DIP option. | Targeted at general-purpose video and composite amplification, not ultra-wideband data acquisition. | Select when cost sensitivity outweighs bandwidth needs and DIP packaging is not required. |
| LM6361IM/NOPB | Higher supply current (12 mA), lower slew rate (300 V/µs), same N8 package - but only 100 MHz GBW. | Optimized for portable video and LCD biasing; lacks 1 GHz performance for RF/IF stages. | Choose for battery-powered systems where power efficiency matters more than sub-100 ns settling. |
Compared with AD847JRZ-REEL7 and LM6361IM/NOPB, the LT1226CN8#PBF uniquely combines 1 GHz GBW, DIP-8 through-hole compatibility, and guaranteed gain-of-25 stability - making it irreplaceable in legacy test equipment upgrades and high-fidelity pulse amplification where layout change is prohibited.
Availability
LT1226CN8#PBF is available at Aetrix Electronics and suitable for data acquisition systems, video cable drivers, photodiode preamplifiers, and active filter designs requiring stable component supply across extended product lifecycles.
Supply support for LT1226CN8#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 technical and manufacturing continuity for legacy Linear op-amps including the LT1226 series.
The LT1226CN8#PBF belongs to Linear's high-speed precision op-amp family, designed specifically for applications demanding simultaneous wide bandwidth, low noise, and DC accuracy - such as instrumentation-grade signal chains and high-fidelity analog front-ends.
FAQ
What is the minimum stable noise gain for LT1226CN8#PBF?
The LT1226CN8#PBF is specified and guaranteed stable at noise gain ≥25. Configurations with lower noise gain require external lag compensation, as detailed in the datasheet's "Compensation for Lower Closed-Loop Gains" section. Operating below this threshold risks oscillation or excessive peaking in both frequency and time domains.
Can LT1226CN8#PBF drive a 75 Ω coaxial cable directly?
Yes - the LT1226CN8#PBF can drive 75 Ω coaxial cable directly, as confirmed in the "Cable Driving" application note (TA05). For optimal pulse fidelity, use series termination (e.g., 200 Ω) at the output and match the far end with 75 Ω to minimize reflections. Its capacitive-load stability ensures no added phase margin loss.
What is the maximum junction temperature and thermal resistance for LT1226CN8#PBF?
The LT1226CN8#PBF has a maximum junction temperature of 150°C and a junction-to-ambient thermal resistance (θJA) of 220°C/W in the N8 DIP package. Under worst-case conditions (±15 V supplies, full output swing), derating is required above 70°C ambient to maintain reliability - heatsinking is recommended for continuous high-current operation.
Does LT1226CN8#PBF require external offset nulling in precision applications?
Offset nulling is optional but recommended for sub-millivolt DC accuracy. The LT1226CN8#PBF provides dedicated null pins (1 and 8) for connection to a 10 kΩ potentiometer. With nulling, input offset voltage can be reduced to <0.3 mV - critical for 12-bit+ data acquisition where VOS drift contributes significantly to total error budget.
Is LT1226CN8#PBF compatible with HA2541 or AD847 PCB footprints?
No - the LT1226CN8#PBF uses an 8-lead DIP (N8) package with 0.300-inch width, while HA2541 and AD847 are typically offered in metal-can or different DIP variants. Pinout matches (e.g., Pin 2 = –IN, Pin 3 = +IN), but mechanical footprint and lead spacing differ. Direct replacement requires board modification unless the original design used the exact N8 outline.
LT1226CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 400V/µs
- Gain Bandwidth Product:
- 1 GHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 µA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 7mA
- Current - Output / Channel:
- -
- 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
LT1226CN8#PBF FAQ
1.How can I place an order for LT1226CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1226CN8#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 LT1226CN8#PBF reliable?
The price and inventory of LT1226CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1226CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1226CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1226CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1226CN8#PBF?
LT1226CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1226CN8#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 LT1226CN8#PBF?
For technical support, including LT1226CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1226CN8#PBF requirements.
6.How does Aetrix verify that LT1226CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1226CN8#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 LT1226CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1226CN8#PBF?
All LT1226CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1226CN8#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 LT1226CN8#PBF part is unused and in its original packaging.
Return procedure for LT1226CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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