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Analog Devices Inc. LT1008CN8#PBF
- Part No.:
- LT1008CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1008CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:207
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Product details
Overview
LT1008CN8#PBF from Analog Devices (formerly Linear Technology) is a precision operational amplifier designed for ultra-low-input-bias-current, microvolt-offset, low-noise analog signal conditioning in metrology-grade instrumentation. It delivers 100 pA max input bias current at 25°C, 120 μV max input offset voltage, 0.5 μVP-P 0.1 Hz–10 Hz noise, 114 dB min CMRR/PSRR, and ±13 V output swing into 10 kΩ - enabling direct replacement of LM108A/LM308A in high-accuracy charge integrators and standard cell buffers.
For engineers reviewing the LT1008CN8#PBF datasheet, LT1008CN8#PBF pinout, LT1008CN8#PBF application, or LT1008CN8#PBF equivalent, key selection considerations include guaranteed picoampere bias current over temperature, externally compensated stability with single capacitor, rail-to-rail input common-mode range (±13.5 V), and compatibility with 8-lead PDIP socket layouts requiring no PCB redesign.
Technical Context
The LT1008CN8#PBF employs a proprietary JFET-input front-end with back-to-back protection diodes and dual external compensation terminals (COMP1, COMP2) to enable flexible frequency response shaping. Its architecture maintains sub-600 pA bias current across –55°C to 125°C and achieves <1.5 μV/°C offset drift via laser-trimmed thin-film resistors.
It supports both standard feedback compensation (CF ≥ 30 pF) and feedforward compensation (CS ≥ 100 pF), delivering 0.1–0.2 V/μs slew rate and >100 kHz gain-bandwidth product in unity-gain stable configurations - optimized for low-frequency precision circuits where thermal EMF, board leakage, and 1/f noise dominate error budgets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 100 pA max at 25°C; ≤600 pA over –55°C to 125°C - enables femtoamp-level charge integration without guard-ring degradation. |
| Input Offset Voltage | 120 μV max at 25°C; ≤250 μV over 0°C to 70°C - ensures ≤0.001% full-scale error in 12-bit+ data acquisition systems. |
| 0.1 Hz–10 Hz Noise | 0.5 μVP-P - critical for DC-stable photodiode amplifiers and thermocouple signal chains requiring sub-μV resolution. |
| CMRR / PSRR | 114 dB min - rejects common-mode interference from noisy power rails or ground loops in isolated sensor interfaces. |
| Supply Current | 600 μA max - allows battery-powered portable calibrators and handheld multimeters with >100-hour runtime on AA cells. |
| Output Swing | ±13 V into 10 kΩ - drives legacy ±12 V ADC references and analog meter movements without level-shifting circuitry. |
| Compensation | External CF/CS pins - permits bandwidth/slew-rate tradeoffs (e.g., 5 MHz GBW at AV = 10 with CF = 3 pF) without changing op-amp IC. |
Pinout & Package
LT1008CN8#PBF is packaged in an 8-lead narrow-body PDIP (N8) with 0.300-inch width, RoHS-compliant lead-free finish (#PBF), and JEDEC MS-001 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | COMP2 | Secondary compensation node for feedforward configuration; bypasses internal gain stages to boost slew rate up to 10 V/μs in voltage followers. |
| 2 | –IN | Inverting input; guarded layout required to prevent nanoamp leakage paths from degrading picoampere bias performance. |
| 3 | +IN | Non-inverting input; must be thermally matched to Pin 2 to avoid microvolt-level thermocouple errors in high-precision buffers. |
| 4 | V– | Negative supply rail; also serves as case ground in metal-can variants - electrically isolated in PDIP but requires clean local return path. |
| 5 | NC | No connect; internally unconnected - must remain floating to avoid parasitic capacitance or EMI coupling. |
| 6 | OUT | Amplifier output; capable of sourcing/sinking 5 mA while maintaining >200 V/mV large-signal gain into 2 kΩ loads. |
| 7 | V+ | Positive supply rail; operates from ±2 V to ±20 V - supports dual-supply operation down to ±1.2 V (two Ni-Cd cells). |
| 8 | COMP1 | Primary compensation node for standard feedback loop; connects to capacitor between OUT and this pin for unity-gain stability. |
Key Features
| Feature | Design Value |
|---|---|
| Picoampere Input Bias | Maintains ≤600 pA over –55°C to 125°C - eliminates need for active guarding in 4½-digit voltmeters and electrometer-grade integrators. |
| Microvolt Offset Stability | ≤0.3 μV/month long-term drift - ensures calibration validity for annual metrology lab audits without recalibration. |
| Low 1/f Noise Corner | 2.5 Hz voltage noise corner - preserves signal integrity in sub-10 Hz seismic sensors and ultra-low-frequency bio-potential amplifiers. |
| External Compensation Flexibility | Two dedicated pins (COMP1/COMP2) support both feedback and feedforward topologies - enables single-part optimization for bandwidth, slew rate, or capacitive load drive. |
| High PSRR/CMRR | 114 dB minimum over full temperature range - rejects ripple from switching power supplies in portable test equipment without additional filtering. |
Applications
| Standard Cell Buffering | Charge Integrator |
|---|---|
Use Scenario: Amplifying saturated Weston standard cell (1.018235 V) in primary voltage calibration labs with <1 ppm/year drift. IC Role / Device Role / Timing Role: Ultra-low-bias-current buffer isolating the cell from loading effects while preserving microvolt-level accuracy. Use Value: 30 pA typical bias current degrades cell voltage by only 1 ppm/year; noise contribution is fractional ppm - meets NIST traceability requirements. | Use Scenario: Integrating photodiode current (100 pA–100 μA) in optical power meters and spectrophotometers. IC Role / Device Role / Timing Role: Precision integrator core with guarded input and external compensation for stable low-frequency response. Use Value: 0.5 μVP-P noise and <1.5 μV/°C drift ensure ≤0.005% linearity over 6-decade dynamic range without recalibration. |
| 4.5-Digit Voltmeter Input | Low-Frequency Active Filter |
Use Scenario: Front-end amplifier in handheld digital multimeters requiring 0.001% basic accuracy and 4.5-digit resolution. IC Role / Device Role / Timing Role: Input stage with rail-to-rail common-mode range (±13.5 V) and 120 μV max offset for auto-zeroed architectures. Use Value: Guaranteed 114 dB PSRR rejects AC mains coupling; ±13 V output swing drives 12-bit SAR ADC references directly. | Use Scenario: 0.01 Hz–10 kHz active filter in vibration analysis systems and audio test equipment requiring <0.01% THD. IC Role / Device Role / Timing Role: Low-noise, low-drift gain block in multiple-feedback (MFB) topology with external compensation tuning. Use Value: External COMP1/COMP2 pins allow bandwidth adjustment without changing op-amp - simplifies filter family design across cutoff frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1012CN8#PBF | Internally compensated; 25 μV max offset (vs 120 μV); same bias current spec; higher quiescent current (800 μA max). | Eliminates external capacitor but sacrifices compensation flexibility - unsuitable for feedforward or custom bandwidth shaping. | Select when board space is constrained and fixed unity-gain stability suffices; not drop-in for LT1008CN8#PBF sockets requiring external CF. |
| OPA189IDR | Zero-drift auto-zero architecture; 0.005 μV/°C drift (vs 1.5 μV/°C); 20 pA max bias current; rail-to-rail output; 1.3 mA supply current. | Superior drift and offset specs but higher power and no external compensation - incompatible with legacy LM108A footprints. | Choose for new designs demanding zero-drift performance; requires PCB redesign due to SOIC-8 pinout mismatch and different compensation scheme. |
Compared with LT1012CN8#PBF and OPA189IDR, the LT1008CN8#PBF uniquely balances picoampere bias current, external compensation control, and LM108A socket compatibility - making it irreplaceable in field-upgradeable metrology hardware where layout changes are prohibited.
Availability
LT1008CN8#PBF is available at Aetrix Electronics and suitable for precision instrumentation, charge-integration-based sensor interfaces, and metrology-grade calibration equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT1008CN8#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 legacy Linear precision op amps including the LT1008 series.
The LT1008 product line was engineered specifically for metrology, calibration, and ultra-low-leakage analog signal chains - prioritizing long-term offset stability, sub-nanoamp input bias, and robustness against thermal EMF and board contamination.
FAQ
What is the maximum operating temperature range for the LT1008CN8#PBF?
The LT1008CN8#PBF is rated for 0°C to 70°C ambient operating temperature. This commercial-grade variant differs from the LT1008M (–55°C to 125°C) and LT1008I (–40°C to 85°C) versions. Its specifications - including 120 μV max input offset voltage and 100 pA max input bias current - are guaranteed within this 0°C to 70°C range per the official Linear Technology datasheet revision B.
Does the LT1008CN8#PBF require external frequency compensation?
Yes, the LT1008CN8#PBF requires external frequency compensation via its dedicated COMP1 and COMP2 pins. Unlike internally compensated op amps, it uses a single capacitor (typically ≥30 pF between OUT and COMP1) for unity-gain stability. This architecture enables bandwidth and slew-rate customization - for example, using CF = 3 pF yields 5 MHz gain-bandwidth at AV = 10 - a capability not available in fixed-compensation alternatives like the LT1012CN8#PBF.
Can the LT1008CN8#PBF replace LM108A or LM308A in existing designs?
Yes, the LT1008CN8#PBF is explicitly designed as a direct socket-compatible upgrade for LM108A and LM308A in 8-lead PDIP layouts. Its pinout matches exactly, and its external compensation scheme mirrors those legacy parts. The LT1008CN8#PBF delivers superior DC performance - including lower offset voltage, lower bias current, and higher CMRR - while maintaining identical AC stability behavior when using the same compensation capacitor values.
What is the purpose of the NC (No Connect) pin on the LT1008CN8#PBF?
Pin 5 of the LT1008CN8#PBF is designated NC (No Connect) and is internally unconnected. It must remain electrically floating - neither tied to ground nor supply - to prevent parasitic capacitance, unintended coupling, or EMI susceptibility. This pin has no functional role in biasing, compensation, or signal routing; its presence is solely for mechanical alignment and package symmetry in the 8-lead PDIP footprint.
How does the LT1008CN8#PBF achieve picoampere input bias current over temperature?
The LT1008CN8#PBF achieves guaranteed ≤600 pA input bias current from –55°C to 125°C through a monolithic JFET-input stage with carefully optimized gate oxide processing and matched transistor geometry. Unlike bipolar-input op amps, its JFET front-end avoids base-current-related drift. The device omits input current-limiting resistors (which would introduce leakage) and relies on back-to-back protection diodes - a design choice validated in the datasheet's absolute maximum ratings and thermal characterization curves.
LT1008CN8#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:
- 0.2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 380µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1008CN8#PBF FAQ
1.How can I place an order for LT1008CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1008CN8#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 LT1008CN8#PBF reliable?
The price and inventory of LT1008CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1008CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1008CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1008CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1008CN8#PBF?
LT1008CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1008CN8#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 LT1008CN8#PBF?
For technical support, including LT1008CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1008CN8#PBF requirements.
6.How does Aetrix verify that LT1008CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1008CN8#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 LT1008CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1008CN8#PBF?
All LT1008CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1008CN8#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 LT1008CN8#PBF part is unused and in its original packaging.
Return procedure for LT1008CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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