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Analog Devices Inc. LT1218CN8#PBF
- Part No.:
- LT1218CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1218CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,973
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Product details
Overview
LT1218CN8#PBF from Analog Devices (formerly Linear Technology) is a precision rail-to-rail input and output bipolar operational amplifier optimized for low-voltage, high-accuracy signal conditioning. It delivers 90µV max input offset voltage across full rail-to-rail common-mode range, 97dB min CMRR, 300kHz gain-bandwidth product, and operates from ±2V to ±15V supplies - enabling direct interfacing with 12-bit ADCs in battery-powered instrumentation.
For engineers reviewing the LT1218CN8#PBF datasheet, LT1218CN8#PBF pinout, LT1218CN8#PBF application, or LT1218CN8#PBF equivalent, key selection criteria include guaranteed rail-to-rail VOS performance over temperature, C-load stability without external compensation, shutdown current <30µA, and compatibility with 8-lead PDIP layouts in space-constrained analog front-ends.
Technical Context
The LT1218CN8#PBF employs dual-input-stage architecture: PNP and NPN differential pairs actively trimmed at both supply rails to maintain ≤90µV VOS across VCM = V– to V+. Its patented offset trimming ensures 97dB minimum CMRR - significantly exceeding typical rail-to-rail op amps.
It features conventional internal compensation for unconditional stability with capacitive loads ≤1000pF, unlike the LT1219 variant which requires a 0.1µF output capacitor. The device achieves 0.10V/µs slew rate and 500V/mV open-loop gain into 10kΩ, minimizing gain error in precision buffer and MUX amplifier configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOS (max) | 90µV across full rail-to-rail input range - enables sub-LSB error in 12-bit systems without calibration |
| CMRR (min) | 97dB - rejects common-mode noise in noisy industrial sensor interfaces |
| GBW | 300kHz - supports stable unity-gain buffering of DC–10kHz sensor signals |
| Slew Rate | 0.10V/µs - handles 10kHz full-scale sine waves with <1% distortion |
| Supply Range | ±2V to ±15V - operates from single 3V or dual ±15V rails without level-shifting |
| IQ (max) | 420µA - allows continuous operation in 10-year battery-powered IoT nodes |
| Shutdown IQ | <30µA - enables microamp-level power gating in sleep-mode sensor hubs |
Pinout & Package
LT1218CN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300" wide body, θJA = 130°C/W, and JEDEC MS-001 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOS TRIM) | Offset null adjustment | Connects to 10kΩ potentiometer wiper for ±2.3mV fine VOS tuning - maintains compatibility with legacy single-op-amp layouts |
| 2 (–IN) | Inverting input | Differential node for feedback networks; accepts rail-to-rail common-mode voltages from V– to V+ |
| 3 (+IN) | Non-inverting input | Differential node for signal inputs; same rail-to-rail VCM range as –IN |
| 4 (V–) | Negative supply | Reference for internal biasing; supports true negative rail operation down to –2V |
| 5 (VOS TRIM) | Offset null adjustment | Second trim terminal - used with Pin 1 for 2-terminal nulling per standard op-amp convention |
| 6 (OUT) | Amplifier output | Rail-to-rail swing: within 12mV of V– and V+ at no load - drives ADC reference buffers directly |
| 7 (V+) | Positive supply | Reference for internal biasing; supports up to +15V; SHDN pin referenced to this rail |
| 8 (SHDN) | Shutdown control | Active-low logic input; pulls supply current to <30µA when tied to V–; compatible with CMOS logic at same supply |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input & output | Enables direct interface with 0–5V ADCs and 3.3V microcontrollers without level shifters or external biasing |
| 90µV max VOS over full VCM | Guaranteed offset spec eliminates need for system-level calibration in medical sensor front-ends |
| 97dB min CMRR | Rejects EMI-coupled noise on shared PCB traces - critical for thermocouple and bridge sensor amplification |
| C-load stable (≤1000pF) | Operates unconditionally stable with ceramic decoupling caps and long PCB traces - no external compensation required |
| 420µA max quiescent current | Supports always-on analog monitoring in energy-harvesting devices with µA-level average power budgets |
| Shutdown mode (<30µA) | Allows dynamic power cycling in multi-channel data acquisition systems to reduce total system IQ |
Applications
| ADC Driver | MUX Amplifier |
|---|---|
|
Use Scenario: Buffering sensor outputs before 12-bit successive-approximation ADC sampling. IC Role / Device Role / Timing Role: Precision voltage follower with rail-to-rail swing and low VOS to preserve full ADC code range. Use Value: 90µV VOS contributes <0.22 LSB error at 5V full scale - avoids software correction in portable instrumentation. |
Use Scenario: Channel-selectable gain stage in 8-channel industrial data loggers. IC Role / Device Role / Timing Role: Low-power, fast-settling amplifier enabling multiplexed analog signal conditioning. Use Value: 0.10V/µs slew rate and 300kHz GBW allow settling to 12-bit accuracy in <10µs after channel switch. |
| Test Equipment Amplifier | High-Side Current Source |
|
Use Scenario: Input stage of handheld multimeter front-end with auto-ranging capability. IC Role / Device Role / Timing Role: Precision transimpedance and buffer amplifier supporting 100nA–10mA measurement ranges. Use Value: 18nA typical input bias current minimizes offset drift in high-impedance current-to-voltage conversion. |
Use Scenario: Fixed-current source for LED biasing or sensor excitation in 5–30V supply systems. IC Role / Device Role / Timing Role: High-side current mirror controller using external MOSFET feedback. Use Value: Rail-to-rail output swing enables accurate current regulation even when load voltage approaches VCC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1218CS8#PBF | Same die, SO-8 package - 190°C/W θJA, no through-hole mounting, smaller footprint | Better thermal performance in compact PCBs; unsuitable for socketed prototyping or high-reliability through-hole assemblies | Select when board space is constrained and surface-mount assembly is available. |
| OPA333AIDR | CMOS input (0.2pA IB), 17µV VOS max, but only 350kHz GBW and no shutdown pin | Superior for ultra-high-Z pH or photodiode sensors; lacks SHDN and rail-to-rail output swing at heavy loads | Choose for femtoamp-level input leakage requirements where shutdown and full rail swing are noncritical. |
Compared with LT1218CS8#PBF, the LT1218CN8#PBF offers superior thermal reliability in high-ambient environments due to lower θJA, while OPA333AIDR trades bipolar precision and robustness for ultra-low input current - making LT1218CN8#PBF optimal for mixed-signal industrial sensing where rail-to-rail swing, shutdown, and proven bipolar stability are essential.
Availability
LT1218CN8#PBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable test equipment, and medical data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1218CN8#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 production and technical support for the LT1218 family. Linear pioneered high-precision analog ICs with proprietary complementary bipolar processes.
The LT1218 series was designed specifically for rail-to-rail precision signal conditioning in battery-powered and industrial instrumentation - emphasizing guaranteed VOS, CMRR, and C-load stability without external components.
FAQ
What is the maximum capacitive load the LT1218CN8#PBF can drive without oscillation?
The LT1218CN8#PBF is internally compensated for unconditional stability with capacitive loads up to 1000pF. This eliminates the need for external compensation networks in most sensor buffer and ADC driver applications. Loads exceeding 1000pF may require isolation resistors or careful layout to maintain phase margin - refer to Figure TPC20 in the official LT1218/LT1219 datasheet for overshoot vs. load curves. The LT1218CN8#PBF's C-load stability is a key differentiator from the LT1219 variant, which requires a 0.1µF output capacitor.
Does the LT1218CN8#PBF support true rail-to-rail output swing under load?
Yes - the LT1218CN8#PBF delivers rail-to-rail output swing with specified limits: within 12mV of V– and V+ at no load, and within 240mV of either rail when sinking or sourcing 2.5mA. This performance is guaranteed across the full operating temperature range (–40°C to +85°C) and supply range (±2V to ±15V). The LT1218CN8#PBF's complementary Darlington output stage enables this behavior without external boost circuitry.
How does the shutdown feature of the LT1218CN8#PBF behave during power-up?
The LT1218CN8#PBF enters active mode when SHDN is pulled to V+ (or ≥2.0V above V–). During power-up, if V+ rises before SHDN is asserted, the device remains in shutdown until SHDN reaches valid logic high. The typical enable time is 20µs, but total output settling adds slew-dependent delay - e.g., stepping from 0V to –2V output requires ~40µs. The LT1218CN8#PBF's SHDN pin is referenced to V+, so it must be driven from the same supply domain or via open-drain interface.
Can the LT1218CN8#PBF be used with single-supply 3V operation?
Yes - the LT1218CN8#PBF is fully specified for single-supply operation from 3V (V+ = 3V, V– = 0V), maintaining rail-to-rail input/output swing, 90µV VOS max, and 420µA IQ max. Input common-mode range extends from 0V to 3V, and output swings from 12mV to 2.988V at no load. This makes the LT1218CN8#PBF suitable for 3V microcontroller-based sensor nodes where headroom and precision are critical.
Is the LT1218CN8#PBF pin-compatible with other op amps in the LT1218/LT1219 family?
Yes - all LT1218 and LT1219 variants in the N8 (PDIP) and S8 (SO-8) packages share identical pinouts, including LT1218CN8#PBF, LT1219CN8#PBF, LT1218LCN8#PBF, and LT1219LCN8#PBF. This allows drop-in substitution between speed grades (LT1218 vs. LT1219) and voltage grades (standard vs. L-version) without PCB changes. However, note that LT1219 variants require a 0.1µF output capacitor for stability, while the LT1218CN8#PBF does not.
LT1218CN8#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:
- Rail-to-Rail
- Slew Rate:
- 0.1V/µs
- Gain Bandwidth Product:
- 280 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 nA
- Voltage - Input Offset:
- 85 µV
- Current - Supply:
- 425µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1218CN8#PBF FAQ
1.How can I place an order for LT1218CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1218CN8#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 LT1218CN8#PBF reliable?
The price and inventory of LT1218CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1218CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1218CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1218CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1218CN8#PBF?
LT1218CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1218CN8#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 LT1218CN8#PBF?
For technical support, including LT1218CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1218CN8#PBF requirements.
6.How does Aetrix verify that LT1218CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1218CN8#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 LT1218CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1218CN8#PBF?
All LT1218CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1218CN8#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 LT1218CN8#PBF part is unused and in its original packaging.
Return procedure for LT1218CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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