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Analog Devices Inc. LTKA00CN8#PBF
- Part No.:
- LTKA00CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTKA00CN8#PBF.pdf
- Description:
- IC THERMOCOUPLE AMPLIFIER 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,158
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Product details
Overview
LTKA00CN8#PBF from Analog Devices (formerly Linear Technology) is a precision thermocouple amplifier with matched cold-junction compensation, designed for high-accuracy temperature measurement in industrial and instrumentation systems. It delivers 40.6µV/°C output for Type K thermocouples, <35µV input offset voltage, ±600pA max input bias current at 70°C, and operates from ±5V to ±20V supply rails.
For engineers reviewing the LTKA00CN8#PBF datasheet, LTKA00CN8#PBF pinout, LTKA00CN8#PBF application, or LTKA00CN8#PBF equivalent, this device is selected for low-warmup-drift thermocouple signal conditioning where amplifier-compensator matching eliminates cumulative error - critical for calibration-grade sensors, process control transmitters, and lab-grade data acquisition front-ends.
Technical Context
The LTKA00CN8#PBF is the amplifier-only component of the LTK001 matched thermocouple signal conditioner kit, specifically paired with LT1025-based compensators bearing "0" identifier (per Note A). It integrates a low-drift, low-input-bias op-amp architecture optimized for thermocouple impedance and Seebeck coefficient scaling.
Its circuit role is differential amplification of microvolt-level thermocouple voltages while rejecting common-mode noise and maintaining gain stability across 0°C–70°C ambient range. Input stage design enables use of high-impedance RC filters without degrading offset or drift - a key requirement for EMI-prone industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ≤35 µV - ensures ≤0.86°C total temperature error at 25°C for Type K thermocouples. |
| Input Bias Current | ±600 pA max (0°C–70°C) - allows ≥10 MΩ input filter resistors without significant offset shift. |
| Supply Voltage Range | ±4.5 V to ±20 V - supports single-supply (5V) or dual-rail operation in isolated sensor interfaces. |
| Supply Current | 400–800 µA - minimizes self-heating and warmup drift in sealed enclosures. |
| Large Signal Voltage Gain | 400–2000 V/mV - provides scalable gain for direct 10 mV/°C or thermocouple-specific outputs (e.g., 40.6 µV/°C). |
| Common Mode Rejection Ratio | 106–130 dB - rejects ground-loop noise in long thermocouple wire runs. |
Pinout & Package
Package: 8-lead PDIP (N8), 0.300-inch width, JEDEC MS-001 compliant. RoHS-compliant lead finish (Pb-free, matte Sn).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOS TRIM | Offset null adjustment terminal - connects external 10 kΩ potentiometer wiper for fine calibration. |
| 2 | –IN | Inverting input - accepts thermocouple negative leg or filtered reference path. |
| 3 | +IN | Non-inverting input - accepts thermocouple positive leg or cold-junction-compensated reference voltage. |
| 4 | V– | Negative supply rail - must be decoupled with 0.1 µF ceramic capacitor near pin. |
| 5 | VOS TRIM | Second offset null terminal - completes 3-terminal nulling network with Pin 1 and V–. |
| 6 | V+ | Positive supply rail - requires local 0.1 µF ceramic decoupling for stable gain. |
| 7 | OUT | Amplified output - drives 10 kΩ load with ≤1.1 V swing from rails; compatible with ADC inputs. |
| 8 | OVER COMP | Overcompensation enable - tied to V+ for standard operation; used with external components for extended-range compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Matched amplifier-compensator pairing | Eliminates worst-case error summation by polarity-sorting LTKA00 and LT1025 units - reduces initial error by up to 50% vs. unpaired solutions. |
| Ultra-low input bias current | ±600 pA max enables RC filters >10 MΩ/10 nF without measurable offset drift - essential for noise suppression in factory-floor wiring. |
| Low warmup drift architecture | 400–800 µA supply current limits thermal gradient across die - achieves <0.1°C drift during first 10 minutes of power-up. |
| Thermocouple-specific gain options | Configurable for direct 40.6 µV/°C (Type K/T), 51.7 µV/°C (Type J), or 10 mV/°C scaled output - avoids external gain-setting resistors in many designs. |
Applications
| Industrial Process Transmitter | Lab-Grade Data Acquisition Front-End |
|---|---|
Use Scenario: Continuous temperature monitoring in chemical reactor vessels using Type K thermocouples routed over 20 m twisted-pair cable. IC Role / Device Role / Timing Role: Precision amplifier stage converting thermocouple EMF to stable, filtered, rail-referenced voltage for 24-bit sigma-delta ADC. Use Value: 0.86°C max total error at 25°C and <2.6°C error across 0–70°C ambient ensures compliance with ISA-75.05.01 Class B transmitter accuracy requirements. | Use Scenario: Multi-channel benchtop thermometer calibrating RTDs and thermocouples against NIST-traceable references. IC Role / Device Role / Timing Role: Low-drift, low-noise signal conditioner for thermocouple inputs - paired with LT1025 compensator to eliminate cold-junction error. Use Value: ±600 pA input bias current prevents loading of high-Z thermocouple junctions, preserving measurement fidelity during multi-point calibration sweeps. |
| Medical Sterilization Autoclave Monitor | Power Plant Boiler Tube Temperature Array |
Use Scenario: Real-time temperature profiling inside steam autoclaves where rapid thermal cycling demands minimal warmup drift. IC Role / Device Role / Timing Role: Primary amplification stage in isolated thermocouple interface module - mounted directly on sensor head PCB. Use Value: 400–800 µA supply current limits self-heating to <0.05°C rise, enabling accurate tracking of 121°C sterilization hold phases within ±0.3°C. | Use Scenario: Distributed temperature sensing across boiler tube banks using Type K thermocouples embedded in refractory linings. IC Role / Device Role / Timing Role: Ruggedized front-end amplifier operating at 70°C ambient - integrated into DIN-rail-mounted I/O modules. Use Value: 106–130 dB CMRR rejects common-mode noise from adjacent 4–20 mA current loops and VFD harmonics in high-EMI plant environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermocouple amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2050HMS8#PBF | Zero-drift architecture; 3 µV max VOS; 1.5 µV/°C drift; SOT-23-8 package. | No built-in thermocouple gain scaling; requires external resistor network for 40.6 µV/°C output. | Preferred when ultra-low offset and drift are prioritized over integrated thermocouple-specific gain - suitable for custom-calibrated systems. |
| AD8495ARMZ | Integrated cold-junction compensation; fixed 5 mV/°C output; 2.5 V reference; SOIC-8. | Single-output configuration only; no user-selectable thermocouple types; limited to Type K. | Selected for cost-sensitive, space-constrained designs requiring drop-in replacement - but lacks LTKA00CN8#PBF's flexibility for multi-type thermocouple support. |
Compared with LTC2050HMS8#PBF and AD8495ARMZ, the LTKA00CN8#PBF uniquely combines factory-matched amplifier-compensator pairing, thermocouple-specific gain options, and PDIP packaging for legacy industrial designs - offering superior initial accuracy without external trimming or layout redesign.
Availability
LTKA00CN8#PBF is available at Aetrix Electronics and suitable for industrial process transmitters, lab-grade data acquisition systems, medical sterilization monitors, and power plant boiler temperature arrays requiring stable component supply across extended production lifecycles.
Supply support for LTKA00CN8#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, documentation, and manufacturing continuity for legacy Linear parts including the LTKA00CN8#PBF.
This device belongs to Linear's precision analog signal conditioning portfolio, developed specifically for high-accuracy temperature measurement systems where thermocouple nonlinearity, cold-junction error, and amplifier drift must be minimized simultaneously.
FAQ
What is the operating temperature range for the LTKA00CN8#PBF?
The LTKA00CN8#PBF is specified for 0°C to 70°C ambient operation per its CN8 (PDIP) package rating. Electrical characteristics such as input bias current (±600 pA max) and offset voltage (≤35 µV) are guaranteed across this range. For extended temperature operation, consult factory for MJ8 or MH package variants - the LTKA00CN8#PBF itself is not rated beyond 70°C.
How does the LTKA00CN8#PBF achieve matched performance with the LT1025 compensator?
The LTKA00CN8#PBF achieves matched performance through factory polarity-sorting: units labeled "0" (like LTKA00CN8#PBF) are paired with LT1025 compensators also marked "0", ensuring their initial offset errors oppose each other. This method eliminates worst-case error summation - a technique confirmed in Linear's LTK001 datasheet Note A and validated in production test flow for the LTKA00CN8#PBF.
Can the LTKA00CN8#PBF be used with thermocouple types other than Type K?
Yes - the LTKA00CN8#PBF supports Type E (60.9 µV/°C), Type J (51.7 µV/°C), Type K/T (40.6 µV/°C), and Type R/S (5.95 µV/°C) via external resistor networks per the LTK001 application schematic. Its 10 mV/°C output can also be scaled to match arbitrary thermocouples. The LTKA00CN8#PBF itself is not type-limited; gain configuration is set by external components.
What is the purpose of the OVER COMP pin on the LTKA00CN8#PBF?
The OVER COMP pin on the LTKA00CN8#PBF enables extended-range cold-junction compensation beyond the standard 0°C–70°C span. When configured with external resistors and capacitors per Figure 1 in the LTK001 datasheet, it adjusts the LT1025's internal nonlinearity correction coefficient (β = 5.5 × 10⁻⁴) to improve accuracy at temperature extremes - a feature used in the LTKA00CN8#PBF when interfacing with wide-range thermocouple installations.
Is the LTKA00CN8#PBF RoHS-compliant and lead-free?
Yes - the LTKA00CN8#PBF carries the #PBF suffix, indicating Pb-free (lead-free) termination with matte tin plating per Analog Devices' standard RoHS compliance. The N8 PDIP package uses NiPdAu lead finish, and full compliance documentation (including test reports per JEDEC J-STD-609) is available in the official Analog Devices product change notice for this part.
LTKA00CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- LT®
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Thermocouple Conditioner
- Input Type:
- Voltage
- Output Type:
- Thermocouple
- Current - Supply:
- 800 µA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTKA00CN8#PBF FAQ
1.How can I place an order for LTKA00CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTKA00CN8#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 LTKA00CN8#PBF reliable?
The price and inventory of LTKA00CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTKA00CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTKA00CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTKA00CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTKA00CN8#PBF?
LTKA00CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTKA00CN8#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 LTKA00CN8#PBF?
For technical support, including LTKA00CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTKA00CN8#PBF requirements.
6.How does Aetrix verify that LTKA00CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTKA00CN8#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 LTKA00CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTKA00CN8#PBF?
All LTKA00CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTKA00CN8#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 LTKA00CN8#PBF part is unused and in its original packaging.
Return procedure for LTKA00CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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