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Analog Devices Inc. LT1812IS8#PBF
- Part No.:
- LT1812IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1812IS8#PBF.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:254
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Product details
Overview
LT1812IS8#PBF from Analog Devices (formerly Linear Technology) is a high-speed, low-power voltage-feedback operational amplifier with shutdown control, 100MHz gain bandwidth, 750V/µs slew rate, and ±3.5V input common-mode range on ±5V supplies. It drives 100Ω loads to ±3.5V and remains stable with 1000pF capacitive loads-enabling use in video buffers, active filters, and cable driver circuits.
For engineers reviewing the LT1812IS8#PBF datasheet, LT1812IS8#PBF pinout, LT1812IS8#PBF application, or LT1812IS8#PBF equivalent, key selection criteria include shutdown current (50µA), unity-gain stability, 8nV/√Hz input noise, –40°C to 85°C industrial temperature rating, and SO-8 package compatibility with standard PCB layouts.
Technical Context
The LT1812IS8#PBF employs a proprietary voltage-feedback topology engineered to deliver current-feedback–like slewing behavior-achieving 750V/µs slew rate while maintaining DC precision (1.5mV max VOS, 4µA max IB). Its internal compensation enables unity-gain stability and robust 1000pF capacitive load drive without external components.
Shutdown is controlled via Pin 5 (SHDN), which reduces supply current to 50µA when pulled below V– + 0.4V. The amplifier remains functional across dual ±1.25V to ±5.5V and single 2.5V to 5V supplies, with rail-to-rail output swing capability on single 5V (1.1V to 3.9V into 100Ω to 2.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 100MHz - supports closed-loop designs up to 10MHz at gain=10 without phase margin erosion |
| Slew Rate | 750V/µs - enables clean 5V-step settling in ≤30ns (0.1%) for high-fidelity pulse amplification |
| Supply Current (Active) | 3.6mA max - enables battery-sensitive portable instrumentation and low-power signal chains |
| Supply Current (Shutdown) | 50µA - reduces system standby power by >98% versus active mode |
| Input Noise Voltage | 8nV/√Hz at 10kHz - preserves SNR in precision sensor front-ends and low-level analog acquisition |
| Capacitive Load Drive | 1000pF - eliminates need for isolation resistors when driving coaxial cables or ADC input capacitance |
| Input Offset Voltage | 1.5mV max - ensures <0.03% gain error in 50× gain instrumentation amplifier configurations |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor equipment |
Pinout & Package
LT1812IS8#PBF is housed in an 8-lead plastic SO (Small Outline, narrow 0.150″) package per JEDEC MS-012. Pin 1 is marked with a dot; leads are gull-wing, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown control input | Pulled ≥2V above V– to enable; ≤0.4V above V– to reduce ICC to 50µA; not internally pulled |
| 2 (V–) | Negative supply rail | Connects to ground (single supply) or negative rail; forms reference for bias and shutdown threshold |
| 3 (+IN) | Non-inverting input | Differential pair base node; balanced NPN/PNP structure yields low IB and IOS |
| 4 (–IN) | Inverting input | Feedback node; input capacitance of 2pF requires CF compensation for RF >2kΩ |
| 5 (VOUT) | Amplifier output | Capable of ±40mA continuous drive into 100Ω; 0.4Ω output impedance at 1MHz |
| 6 (V+) | Positive supply rail | Accepts +2.5V to +5.5V (single) or ±1.25V to ±5.5V (dual); powers internal bias and output stage |
| 7 (NC) | No connect | Internally unused; must remain unconnected per datasheet Note 10 |
| 8 (NC) | No connect | Internally unused; must remain unconnected per datasheet Note 10 |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback architecture with current-feedback slewing | Delivers 100MHz GBW and 750V/µs slew rate simultaneously-unattainable in conventional VFB op-amps |
| 1000pF capacitive load stability | Enables direct driving of long cables, ADC inputs, and filter networks without external isolation or compensation |
| Shutdown mode with 50µA quiescent current | Reduces system-level standby power in multi-channel data loggers and portable test equipment |
| ±3.5V input common-mode range on ±5V supplies | Supports rail-sensing in industrial 4–20mA receivers and bipolar sensor interfaces without level-shifting |
| Specified performance from –40°C to +85°C | Guaranteed operation in extended-temperature industrial PLCs, motor drives, and outdoor communications hardware |
| Low 8nV/√Hz input noise at 10kHz | Maintains signal integrity in low-amplitude photodiode, strain gauge, and microphone preamplifier stages |
Applications
| Video Line Driver | High-Speed Active Filter |
|---|---|
Use Scenario: Driving 75Ω coaxial video lines in security camera systems with minimal distortion. IC Role / Device Role / Timing Role: Buffer amplifier with unity-gain configuration, compensating for cable loss and maintaining signal fidelity. Use Value: 0.12dB peaking and 0.07° differential phase error at 1MHz ensure broadcast-grade color accuracy and sync integrity. | Use Scenario: Implementing a 4th-order Butterworth low-pass filter at 4MHz for anti-aliasing before high-speed ADC sampling. IC Role / Device Role / Timing Role: Gain stage and buffer in Sallen-Key topology, providing precise pole placement and drive capability. Use Value: 100MHz GBW and 750V/µs slew rate prevent filter response degradation at cutoff frequency and support fast transient rejection. |
| Data Acquisition Front-End | Industrial Sensor Signal Conditioning |
Use Scenario: Amplifying low-level thermocouple or RTD signals prior to digitization in modular DAQ systems. IC Role / Device Role / Timing Role: Precision gain block with programmable shutdown during idle cycles to conserve power. Use Value: 1.5mV max input offset and 8nV/√Hz noise preserve µV-level resolution; 50µA shutdown current extends battery life in portable units. | Use Scenario: Conditioning 4–20mA loop signals in programmable logic controllers with wide ambient temperature swings. IC Role / Device Role / Timing Role: Rail-to-rail input/output amplifier operating from ±5V rails, interfacing directly with current-sense resistors. Use Value: ±3.5V input CMR and –40°C to +85°C guaranteed operation ensure reliable signal translation across industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4897-1ARJZ-R7 | Lower 1nV/√Hz noise, 220MHz GBW, but no shutdown; 5-lead SOT-23 package | Preferred for ultra-low-noise RF/IF amplification where power gating is unnecessary | Select ADA4897-1ARJZ-R7 when noise dominates over power savings and shutdown is not required |
| OPA695IDBVR | Higher 1.7GHz GBW, current-feedback architecture, 1100V/µs slew rate, no shutdown | Used in >100MHz video distribution and high-speed DAC output buffering | Select OPA695IDBVR only when bandwidth exceeds 200MHz and shutdown functionality is not needed |
Compared with ADA4897-1ARJZ-R7 and OPA695IDBVR, the LT1812IS8#PBF uniquely balances 100MHz bandwidth, 50µA shutdown, SO-8 layout compatibility, and industrial temperature rating-making it optimal for cost-sensitive, power-aware, medium-bandwidth industrial signal conditioning where pin count and thermal management matter.
Availability
LT1812IS8#PBF is available at Aetrix Electronics and suitable for video line drivers, active filters, data acquisition front-ends, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for LT1812IS8#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, manufacturing, and documentation for legacy Linear parts including the LT1812 series.
The LT1812 product line was designed specifically for high-speed, low-power, precision analog signal paths in industrial, instrumentation, and video systems-emphasizing capacitive load drive, shutdown efficiency, and DC accuracy without sacrificing bandwidth.
FAQ
What is the maximum capacitive load the LT1812IS8#PBF can drive while remaining stable?
The LT1812IS8#PBF is specified to remain unity-gain stable with up to 1000pF capacitive load, a key differentiator among 100MHz op-amps. This capability eliminates external isolation resistors when driving coaxial cables, ADC input capacitance, or multi-pole filter networks-verified under ±5V supply conditions with 100Ω series termination recommended for optimal pulse fidelity.
Does the LT1812IS8#PBF support single-supply operation?
Yes, the LT1812IS8#PBF operates from a single 2.5V to 5V supply. With a 5V supply and output loaded to 2.5V, it delivers a 1.1V to 3.9V output swing. Input common-mode range extends from 1.5V to 3.5V, enabling direct interfacing with mid-supply-referenced sensors and ADCs without level-shifting circuitry.
What is the function of Pins 7 and 8 on the LT1812IS8#PBF SO-8 package?
Pins 7 and 8 of the LT1812IS8#PBF are designated NC (No Connect) and must remain unconnected per datasheet Note 10. These pins are not bonded internally and have no electrical function; routing traces or soldering to them may compromise reliability or violate qualification testing.
How does shutdown affect the output state of the LT1812IS8#PBF?
In shutdown mode (SHDN pin ≤ V– + 0.4V), the LT1812IS8#PBF reduces supply current to ~50µA but does not isolate the output from the inputs. The amplifier remains partially active: for example, with a 1V DC input in unity-gain configuration, it continues to source ~2mA into a 100Ω load. Therefore, LT1812IS8#PBF shutdown is unsuitable for multiplexing or output disabling-it is strictly for quiescent power reduction.
Is the LT1812IS8#PBF pin-compatible with other members of the LT181x family?
No-the LT1812IS8#PBF (SO-8, shutdown-enabled) is not pin-compatible with the LT1812CS5#PBF (5-lead TSOT-23, no shutdown) or LT1812IS6#PBF (6-lead TSOT-23, shutdown). Only the LT1813 dual variant shares functional equivalence in SO-8 packaging (LT1813IS8#PBF), but pinout differs due to second amplifier channel and shared shutdown.
LT1812IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 750V/µs
- Gain Bandwidth Product:
- 100 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 900 nA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 3mA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1812IS8#PBF FAQ
1.How can I place an order for LT1812IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1812IS8#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 LT1812IS8#PBF reliable?
The price and inventory of LT1812IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1812IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1812IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1812IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1812IS8#PBF?
LT1812IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1812IS8#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 LT1812IS8#PBF?
For technical support, including LT1812IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1812IS8#PBF requirements.
6.How does Aetrix verify that LT1812IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1812IS8#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 LT1812IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1812IS8#PBF?
All LT1812IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1812IS8#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 LT1812IS8#PBF part is unused and in its original packaging.
Return procedure for LT1812IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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