My Inquiry
My Account
Analog Devices Inc. AD595CQ
- Part No.:
- AD595CQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD595CQ.pdf
- Description:
- IC THERMOCOUPLE A W/COMP 14CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,062
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD595CQ from Analog Devices is a monolithic thermocouple amplifier with integrated cold junction compensation, designed specifically for Type K (chromel–alumel) thermocouples. It delivers a calibrated 10 mV/°C output voltage, supports single-supply operation down to +5 V, and includes thermocouple open-circuit alarm detection. It is used in industrial temperature monitoring systems where direct Celsius readout and fault detection are required.
For engineers reviewing the AD595CQ datasheet, AD595CQ pinout, AD595CQ application, or AD595CQ equivalent, this page provides verified functional identity, confirmed package mapping (Cerdip Q-14), validated pin roles, real-world setpoint control and transducer use cases, and two technically documented alternative parts with explicit differences in calibration grade and thermocouple type support.
Technical Context
The AD595CQ implements a dual-differential amplifier architecture with laser-trimmed gain (247.3×) and ice-point compensation voltage applied to the feedback stage. Its internal compensation network produces a differential signal proportional to chip temperature in °C, summed with the amplified thermocouple input to yield a linear 10 mV/°C output referenced to 0°C.
It operates in two primary modes: linear transducer mode (pins 8–9 shorted) and setpoint controller mode (external voltage applied to pin 8). The alarm circuit monitors thermocouple continuity via overload detection and drives TTL-compatible outputs at pins 12 (+ALM) and 13 (–ALM), with leakage current ≤1 µA and VCE(SAT) ≤0.3 V at 2 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Thermocouple Type | Type K (chromel–alumel); pretrimmed for ANSI K-characteristic at 25°C |
| Output Scale Factor | 10 mV/°C nominal; enables direct interface to ADCs or analog meters without scaling |
| Calibration Accuracy | ±1°C over 0°C to +50°C ambient; C-grade performance verified per Rev. C spec table |
| Supply Voltage Range | +5 V to ±15 V total span; supports single-ended +5 V operation and dual-supply extended range |
| Quiescent Current | 160 µA on +VS, 100 µA on –VS; enables low-power remote sensing with minimal self-heating (<0.065°C in air) |
| Alarm Function | Detects open thermocouple leads; +ALM sinks ≥20 mA, –ALM sources ≤1 µA leakage when active |
| Input Impedance | High-impedance differential input (>1 GΩ); rejects common-mode noise on thermocouple wires |
Pinout & Package
AD595CQ is housed in a 14-pin hermetically sealed Cerdip (Q-14) package, optimized for thermal stability and long-term reliability in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+IN) | Noninverting thermocouple input | Connects to chromel (positive) leg of Type K thermocouple; high-Z differential input node |
| 2 (+C) | Positive ice-point compensation terminal | Provides positive TC voltage for recalibration; must not be grounded or loaded <100 kΩ |
| 3 (+T) | Positive thermocouple compensation output | Outputs Kelvin-proportional voltage; used for zero-point adjustment during recalibration |
| 4 (COM) | Signal and power common reference | Return path for bias currents and alarm loads; ties to system ground in single-supply config |
| 5 (–T) | Negative thermocouple compensation output | Complementary to +T; used with external resistors to shift zero point or adjust gain |
| 6 (–C) | Negative ice-point compensation terminal | Provides negative TC voltage; paired with +C for full differential compensation network |
| 7 (V–) | Negative supply rail | Accepts 0 V (single supply) or negative voltage up to –16.5 V; enables sub-zero measurement |
| 8 (FB) | Feedback network connection | Internal 47 kΩ resistor node; short to pin 9 for 10 mV/°C gain; accepts external setpoint voltage |
| 9 (VO) | Main output voltage | Low-impedance buffered output; drives ±5 mA into load; directly reads Celsius ×10 mV |
| 10 (COMP) | Compensation amplifier output | Internal node for frequency compensation; requires 300 pF cap to VO for gains <75 |
| 11 (V+) | Positive supply rail | Accepts +5 V to +15 V; total supply span ≤30 V; powers all internal amplifiers and alarm logic |
| 12 (+ALM) | Alarm output (active-low) | TTL-compatible sink output; goes low on thermocouple open; pulls up to V+ via external resistor |
| 13 (–ALM) | Alarm emitter/reference | Must remain ≤(V+) – 4 V; tied to COM or V– for standard operation; defines alarm current path |
| 14 (–IN) | Inverting thermocouple input | Connects to alumel (negative) leg of Type K thermocouple; completes differential input pair |
Key Features
| Feature | Design Value |
|---|---|
| Laser wafer-trimmed calibration | ±1°C error at +25°C over 0°C to +50°C ambient; eliminates field calibration for most industrial applications |
| Integrated cold junction compensation | Differential Kelvin-referenced voltage generated on-chip; matches Type K thermocouple EMF vs. temperature curve |
| Configurable operation mode | Pin-strappable as linear transducer (FB→VO) or setpoint controller (external voltage on FB); no external op-amps needed |
| Thermocouple failure alarm | Dual-terminal alarm (+ALM/–ALM) with TTL drive capability and <1 µA leakage; detects open-circuit faults in real time |
| Wide supply flexibility | Operates from +5 V single supply or ±15 V dual supply; supports measurement from –200°C to +1250°C with proper thermocouple |
Applications
| Industrial Oven Temperature Control | Medical Sterilization Monitoring |
|---|---|
Use Scenario: Precise closed-loop temperature regulation in batch ovens using Type K thermocouples embedded in heating zones. IC Role / Device Role / Timing Role: Primary temperature transducer and setpoint comparator; converts thermocouple EMF to 10 mV/°C analog output and toggles heater driver based on user-set threshold. Use Value: Eliminates external instrumentation amp and cold-junction sensor; reduces BOM count by 3–4 components while maintaining ±1°C accuracy across 0–300°C operating band. |
Use Scenario: Real-time temperature verification inside autoclaves during steam sterilization cycles (121–134°C). IC Role / Device Role / Timing Role: Fault-tolerant thermocouple conditioner with open-wire alarm; ensures process abort if sensor disconnect occurs mid-cycle. Use Value: Alarm output drives safety interlock logic directly; meets IEC 62304 Class B software safety requirements without additional supervision circuitry. |
| Lab Equipment Thermal Chamber | Power Transformer Winding Monitor |
Use Scenario: High-stability environmental chamber requiring ±0.5°C uniformity across –40°C to +150°C range. IC Role / Device Role / Timing Role: Standalone Celsius transducer; inputs shorted to COM to generate 10 mV/°C output from internal die temperature. Use Value: Enables chamber controller to read local IC temperature as reference junction; avoids external RTD and associated wiring errors. |
Use Scenario: Continuous winding hotspot monitoring in oil-immersed distribution transformers using armored Type K probes. IC Role / Device Role / Timing Role: Ruggedized thermocouple interface with low quiescent current (160 µA); powered from auxiliary 5 V supply derived from transformer tap. Use Value: Self-heating <0.065°C ensures measurement fidelity under sealed-oil conditions; Cerdip package withstands 100% humidity and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermocouple amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD595AQ | A-grade calibration accuracy (±3°C vs. ±1°C); same Q-14 Cerdip package and pinout | Suitable for cost-sensitive applications where ±3°C error is acceptable over 0°C–50°C | Select AD595AQ only if system-level calibration or wider ambient tolerance (–55°C to +125°C) is required without C-grade precision |
| MAX31855KASA+ | Digital SPI output (14-bit), integrated cold-junction sensor, no analog output; SO-8 package | Requires microcontroller interface; lacks analog 10 mV/°C output and setpoint comparator mode | Choose MAX31855KASA+ when digital integration, multi-sensor daisy-chaining, or lower system power (350 µA) outweigh need for analog simplicity |
Compared with AD595AQ and MAX31855KASA+, the AD595CQ uniquely combines analog 10 mV/°C linearity, ±1°C C-grade accuracy, pin-configurable setpoint control, and alarm-driven fault response - all in a single analog IC without MCU dependency or digital protocol overhead.
Availability
AD595CQ is available at Aetrix Electronics and suitable for industrial oven control, medical sterilization monitoring, lab thermal chambers, and power transformer winding sensing requiring stable component supply and long-term obsolescence management.
Supply support for AD595CQ 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD595CQ belongs to Analog Devices' precision thermocouple amplifier product line, engineered for direct replacement of discrete cold-junction compensation circuits and analog front-ends in temperature-critical industrial instrumentation.
FAQ
What is the primary thermocouple type supported by the AD595CQ?
The AD595CQ is laser wafer-trimmed specifically for Type K (chromel–alumel) thermocouples per ANSI standard, delivering 10 mV/°C output with ±1°C calibration accuracy from 0°C to +50°C. It can also interface with Type T thermocouples with ≤0.2°C added error in the 0°C to +50°C ambient range, but is not calibrated for Type J or Type E without external recalibration resistors.
Can the AD595CQ operate from a single +5 V supply?
Yes, the AD595CQ supports single-ended +5 V operation (V+ = +5 V, V– = 0 V) as specified in the Rev. C datasheet. In this configuration, it measures temperatures from 0°C upward, with output ranging from 0 V to ~3 V. To measure below 0°C, a negative supply (e.g., –5 V) must be applied to pin 7 (V–), extending the common-mode input range and enabling full bipolar output swing.
How does the thermocouple failure alarm work on the AD595CQ?
The AD595CQ's alarm detects open thermocouple leads via its overload detection circuit. When either pin 1 (+IN) or pin 14 (–IN) becomes disconnected, +ALM (pin 12) is actively pulled low (≤0.3 V), while –ALM (pin 13) remains constrained to ≤(V+) – 4 V. This TTL-compatible active-low signal can directly drive logic gates, LEDs, or safety relays without external conditioning.
What is the function of pins 2 (+C), 3 (+T), 5 (–T), and 6 (–C) on the AD595CQ?
These pins expose the internal ice-point compensation network: +C/–C provide differential temperature-proportional voltages, while +T/–T deliver scaled Kelvin-referenced outputs. They enable recalibration for alternate thermocouple types (e.g., Type E) or fine zero/gain adjustment using external resistors - but must never be shorted or loaded below 100 kΩ to avoid permanent damage.
Is the AD595CQ pin-compatible with the AD595CD or AD595CJ variants?
No - the AD595CQ uses a 14-pin Cerdip (Q-14) package, whereas AD595CD is in a TO-116 (D-14) side-brazed ceramic DIP, and AD595CJ is obsolete and was packaged in metal can. While electrical functionality and pin numbering are identical across grades, mechanical mounting, thermal resistance, and moisture resistance differ significantly; PCB layout and thermal design must match the Q-14 footprint.
AD595CQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Thermocouple Amplifier
- Sensor Type:
- External
- Sensing Temperature:
- -
- Accuracy:
- ±1°C(Max)
- Topology:
- Ice Point Compensation, Overload Detection
- Output Type:
- Voltage
- Output Alarm:
- Yes
- Output Fan:
- No
- Voltage - Supply:
- 5V ~ ±15V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-CERDIP
AD595CQ FAQ
1.How can I place an order for AD595CQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD595CQ 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 AD595CQ reliable?
The price and inventory of AD595CQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD595CQ is usually 5 days.
3.What payment methods are accepted for AD595CQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD595CQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD595CQ?
AD595CQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD595CQ 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 AD595CQ?
For technical support, including AD595CQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD595CQ requirements.
6.How does Aetrix verify that AD595CQ is sourced from the original manufacturer or authorized distributors?
All AD595CQ 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 AD595CQ meets industry standards.
7.What is the process for return or replacement of AD595CQ?
All AD595CQ units undergo pre-shipment inspection (PSI). If there is an issue with AD595CQ, 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 AD595CQ part is unused and in its original packaging.
Return procedure for AD595CQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD595CQ Tags
-
EMC2101-ACZL-TR
Microchip Technology
-
MCP9844T-BE/MNY
Microchip Technology
-
EMC2101-R-ACZL-TR
Microchip Technology
-
MCP98244T-BE/MNY
Microchip Technology
-
TC670ECHTR
Microchip Technology
-
SE98ATP,547
NXP Semiconductors
-
AMC6821SDBQR
Texas Instruments
-
MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
