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Analog Devices Inc. AD8495ARMZ
- Part No.:
- AD8495ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8495ARMZ.pdf
- Description:
- IC THERMOCOUPLE A W/COMP 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,757
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Product details
Overview
AD8495ARMZ from Analog Devices is a precision K-type thermocouple amplifier with integrated cold junction compensation, delivering a calibrated 5 mV/°C output voltage, ±2°C total accuracy over −25°C to +400°C measurement range, and laser-trimmed initial accuracy of 1°C. It operates from single supplies (2.7 V to 36 V) and supports thermocouple break detection in oven temperature monitoring systems.
For engineers reviewing the AD8495ARMZ datasheet, AD8495ARMZ pinout, AD8495ARMZ application, or AD8495ARMZ equivalent, this page delivers verified technical context, real-world use cases for industrial thermal sensing, confirmed pin functions, and validated alternative options for K-type thermocouple signal conditioning.
Technical Context
The AD8495ARMZ integrates a fixed-gain instrumentation amplifier (gain = 122.4) optimized for K-type thermocouples and an on-die temperature sensor for cold junction compensation. Its PNP-input architecture provides 25 nA typical input bias current and enables thermocouple break detection via rail-to-rail output response when −IN is grounded through 1 MΩ.
It features differential high-impedance inputs (1 MΩ effective), 0.025°C/°C ambient temperature rejection over 0°C–50°C, and robust input protection rated for ±25 V beyond supply rails. The device achieves 25 kHz −3 dB bandwidth and settles to 0.1% in 40 μs for dynamic thermal event capture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Transfer Function | 5 mV/°C - directly converts thermocouple voltage to Celsius-scaled analog output without external scaling |
| Initial Accuracy | ±1°C at 25°C - laser wafer trimmed, enabling one-point calibration in production |
| Ambient Temp Rejection | 0.025°C/°C - limits error from reference junction drift across 0°C to 50°C ambient range |
| Supply Range | 2.7 V to 36 V single supply - supports direct interface with 3 V ADCs and industrial 24 V systems |
| Input Overvoltage Protection | ±25 V beyond supply rails - protects against ESD and field-induced transients in harsh environments |
| Quiescent Current | 180 μA - enables low-power battery operation and minimizes self-heating error |
| Thermocouple Type | K-type (chromel–alumel) - pretrimmed gain and CJC optimized specifically for K thermocouple Seebeck curve |
Pinout & Package
AD8495ARMZ is housed in an 8-lead MSOP (RM-8) package, RoHS-compliant, with θJA = 135°C/W on a 4-layer JEDEC PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative thermocouple input | PNP input terminal; bias current flows out - used with 1 MΩ ground resistor for open-couple detection |
| 2 (REF) | Reference voltage input | Low-impedance node for offset adjustment; 1 V/V gain to output enables 0°C measurement on single supply |
| 3 (−VS) | Negative supply rail | Supports dual-supply operation down to ±2.7 V; unbalanced supplies permitted if common-mode stays in range |
| 4 (NC) | No connect | Internally unused; must remain floating - no routing or soldering required |
| 5 (SENSE) | Setpoint mode sense input | In setpoint controller configuration, connects to external threshold; in thermometer mode, tied to OUT |
| 6 (OUT) | Analog output | 0.025 V to (VS − 0.1 V) swing; drives ≥±5 mA load; rail-to-rail response indicates thermocouple open fault |
| 7 (+VS) | Positive supply rail | Accepts up to +36 V; powers internal amplifier, CJC sensor, and ESD/OVP circuitry |
| 8 (+IN) | Positive thermocouple input | Differential input paired with −IN; rejects common-mode noise on long thermocouple leads |
Key Features
| Feature | Design Value |
|---|---|
| Integrated cold junction compensation | On-chip temperature sensor eliminates need for external RTD or thermistor, reducing BOM and layout complexity |
| Thermocouple break detection | Self-diagnostic function using PNP input bias current - outputs >4.9 V when −IN floats, signaling open wire |
| Rugged input protection | 4 kV HBM ESD rating and ±25 V overvoltage tolerance prevent damage during handling or field operation |
| Differential noise rejection | High CMRR (>100 dB at dc, >60 dB at 1 kHz) suppresses EMI picked up by thermocouple extension wires |
| Flexible output configuration | REF and SENSE pins enable both standalone thermometer (OUT = 5 mV/°C) and setpoint controller (comparator) modes |
Applications
| Oven Temperature Monitoring | Exhaust Gas Sensing |
|---|---|
Use Scenario: Real-time temperature feedback in residential/commercial convection ovens with K-type thermocouples embedded near heating elements. IC Role / Device Role / Timing Role: Precision thermocouple signal conditioner providing cold-junction-compensated 5 mV/°C analog output to microcontroller ADC. Use Value: Eliminates manual calibration drift caused by ambient temperature changes at PCB mounting point; maintains ±2°C accuracy across 0°C–50°C cabinet ambient range. |
Use Scenario: Continuous exhaust gas temperature measurement upstream of catalytic converter in light-duty vehicles. IC Role / Device Role / Timing Role: High-reliability front-end amplifier converting millivolt-level K-type thermocouple signals into robust analog voltage for engine control unit sampling. Use Value: Withstands automotive transients and under-hood EMI due to integrated OVP and 4 kV ESD protection; 25 kHz bandwidth captures rapid thermal transients during acceleration. |
| Catalytic Converter Health Monitoring | Industrial Setpoint Controller |
Use Scenario: Dual-point thermal monitoring across catalyst inlet and outlet to infer conversion efficiency and detect thermal runaway. IC Role / Device Role / Timing Role: Paired AD8495ARMZ devices provide matched, cold-junction-compensated outputs for differential temperature calculation. Use Value: Laser-trimmed gain matching (122.4) and ambient rejection (0.025°C/°C) ensure <0.5°C inter-channel error - critical for detecting <10°C ΔT shifts. |
Use Scenario: Standalone overtemperature shutdown in power supply thermal management, using AD8495ARMZ as comparator with adjustable trip point. IC Role / Device Role / Timing Role: Configured in setpoint mode: SENSE tied to REF voltage; OUT switches high when measured temperature exceeds threshold. Use Value: No external comparator needed - REF pin sets precise trip point (e.g., 2.5 V = 500°C); rail-to-rail output directly drives MOSFET gate or optocoupler LED. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermocouple signal conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31855KASA+ | Digital SPI output (14-bit), integrated cold-junction sensor, but no analog output; requires MCU interface | Best for systems with available SPI and firmware resources; unsuitable for direct ADC or analog control loops | Select when digital output, auto-linearization, or multi-thermocouple support is prioritized over analog simplicity |
| AD8497ARMZ | Same architecture and pinout, but optimized for 25°C–100°C ambient range and higher-temp K-type measurements (−25°C to +295°C) | Better suited for under-hood or industrial furnace applications where PCB ambient exceeds 50°C | Choose AD8497ARMZ if reference junction ambient consistently exceeds 50°C; otherwise AD8495ARMZ offers tighter 0°C–50°C CJC accuracy |
Compared with MAX31855KASA+, AD8495ARMZ delivers plug-and-play analog integration without firmware overhead; versus AD8497ARMZ, it provides superior cold-junction compensation stability in lab and kitchen environments where ambient stays within 0°C–50°C.
Availability
AD8495ARMZ is available at Aetrix Electronics and suitable for oven temperature monitoring, exhaust gas sensing, catalytic converter health monitoring, and industrial setpoint controller applications requiring stable component supply and long-term thermal accuracy.
Supply support for AD8495ARMZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing expertise spanning precision instrumentation and sensor interfaces.
The AD849x family was designed specifically for thermocouple-based temperature measurement systems, integrating cold junction compensation, gain calibration, and fault detection into a single IC to replace multi-component discrete solutions.
FAQ
What thermocouple type is AD8495ARMZ calibrated for?
AD8495ARMZ is laser trimmed and optimized exclusively for K-type (chromel–alumel) thermocouples. Its fixed gain of 122.4 and cold junction compensation algorithm match the Seebeck coefficient and nonlinearity profile of K-type thermocouples across the full measurement range of −25°C to +400°C.
Can AD8495ARMZ measure temperatures below 0°C?
Yes, AD8495ARMZ can measure below 0°C when a positive voltage is applied to the REF pin to offset the output. For example, applying 1.25 V to REF shifts the zero point to −250°C (since 5 mV/°C × −250°C + 1.25 V = 0 V), enabling full-range K-type operation down to −25°C with appropriate supply and load conditions.
How does AD8495ARMZ detect an open thermocouple?
AD8495ARMZ uses its PNP-input structure: input bias current flows out of −IN. When the thermocouple opens, −IN floats and is pulled high by the bias current, driving the output to the positive rail. This rail-to-rail response - observable as >4.9 V on OUT with a 5 V supply - signals an open-couple fault without external circuitry.
What is the maximum ambient temperature range for reliable cold junction compensation in AD8495ARMZ?
AD8495ARMZ is specified for accurate cold junction compensation over an ambient temperature range of 0°C to 50°C. Within this range, its ambient temperature rejection is guaranteed at 0.025°C/°C. Operation outside this range increases CJC error and is not characterized per the datasheet.
Is AD8495ARMZ pin-compatible with other AD849x variants like AD8494ARMZ?
Yes, AD8495ARMZ shares identical 8-lead MSOP (RM-8) pinout and footprint with AD8494ARMZ, AD8496ARMZ, and AD8497ARMZ. However, they differ in thermocouple type (K vs. J), ambient optimization (0°C–50°C vs. 25°C–100°C), and gain (122.4 vs. 96.7 or 90.35), so electrical substitution requires validation of system-level accuracy requirements.
AD8495ARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Thermocouple Amplifier
- Input Type:
- Differential
- Output Type:
- Analog
- Current - Supply:
- 250 µA
- Operating Temperature:
- 0°C ~ 50°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8495ARMZ FAQ
1.How can I place an order for AD8495ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8495ARMZ 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 AD8495ARMZ reliable?
The price and inventory of AD8495ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8495ARMZ is usually 5 days.
3.What payment methods are accepted for AD8495ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8495ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8495ARMZ?
AD8495ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8495ARMZ 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 AD8495ARMZ?
For technical support, including AD8495ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8495ARMZ requirements.
6.How does Aetrix verify that AD8495ARMZ is sourced from the original manufacturer or authorized distributors?
All AD8495ARMZ 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 AD8495ARMZ meets industry standards.
7.What is the process for return or replacement of AD8495ARMZ?
All AD8495ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8495ARMZ, 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 AD8495ARMZ part is unused and in its original packaging.
Return procedure for AD8495ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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