Part A
AD8495ARMZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7539 PCS
- Package
- MSOP-8
- Series
- Interface - interface pour capteurs et détecteurs
Replacement verdict
Compatible functional replacement candidate
The AD8495ARMZ and AD8494CRMZ are both thermocouple amplifier ICs from the same Analog Devices AD849x family, sharing an identical functional architecture and package footprint. The AD8495ARMZ is factory-trimmed for a 5 mV/°C output slope optimized for K-type thermocouples, while the AD8494CRMZ provides a 10 mV/°C output slope with a wider setpoint range, making them functionally interchangeable only when the downstream signal chain is recalibrated for the differing transfer function. Designers should validate gain scaling, cold-junction compensation accuracy, and supply headroom before substituting one for the other in a production design.
Output Slope
Validation required
Package Type
High match
Supply Voltage Range
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD8494CRMZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7989 PCS
- Package
- TSSOP-8
- Series
- Interface - interface pour capteurs et détecteurs
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8495ARMZ | AD8494CRMZ | Why it matters |
|---|---|---|---|
| Sensor Type | K-type thermocouple | J-type thermocouple | Determines which thermocouple alloy the amplifier is calibrated for; using the wrong type causes large temperature measurement errors. |
| Output Voltage Range | 0 V to 5 V (single supply) | 0 V to 5 V (single supply) | Both provide a ratiometric analog output, but the calibration curve differs due to the thermocouple type. |
| Temperature Range (specified) | -25°C to +400°C (K-type) | -25°C to +400°C (J-type) | Defines the calibrated measurement span; the usable range depends on the thermocouple type and its Seebeck characteristics. |
| Output Sensitivity | 5 mV/°C | 5 mV/°C | Both offer the same nominal gain, but the internal cold-junction compensation is matched to different thermocouple curves. |
| Cold Junction Compensation | Optimized for K-type | Optimized for J-type | CJC accuracy directly affects measurement error; the compensation network must match the thermocouple type. |
| Supply Voltage | 2.7 V to 18 V (single) / ±2.7 V to ±18 V (dual) | 2.7 V to 18 V (single) / ±2.7 V to ±18 V (dual) | Wide supply range enables battery and industrial operation; identical here so not a differentiator. |
| Package | 8-lead MSOP | 8-lead MSOP | Same footprint allows drop-in board replacement, but electrical calibration still differs. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Ambient operating range of the IC itself; identical, so not a substitution barrier. |
| Input Offset Voltage | ±25 µV (typical) | ±25 µV (typical) | Low offset improves accuracy at low temperature differentials; identical between the two parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8495ARMZ | AD8494CRMZ |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Type | Thermocouple Amplifier | Thermocouple Amplifier |
| Input Type | Differential | Differential |
| Output Type | Analog | Analog |
| Supply Current | 250 µA | 250 µA |
| Operating Temperature | 0°C ~ 50°C | 0°C ~ 50°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8495ARMZ and AD8494CRMZ?
The AD8495ARMZ is a K-type thermocouple amplifier with a 5 mV/°C output sensitivity and a 0°C to 50°C reference junction compensation range, supplied in an 8-lead MSOP package. The AD8494CRMZ is a J-type thermocouple amplifier with a 5 mV/°C output sensitivity and a 0°C to 50°C reference junction compensation range, supplied in an 8-lead SOIC package. The primary differences are the supported thermocouple type (K vs. J) and the package footprint (MSOP vs. SOIC).
Are the AD8495ARMZ and AD8494CRMZ pin-compatible?
No. The AD8495ARMZ uses an 8-lead MSOP package, while the AD8494CRMZ uses an 8-lead SOIC package. These are different package footprints with different PCB land patterns, so they are not drop-in pin-compatible replacements on the same board layout.
Can the AD8495ARMZ and AD8494CRMZ be substituted for each other in a design?
Not directly. The AD8495ARMZ is configured for K-type thermocouples and the AD8494CRMZ is configured for J-type thermocouples, so substitution requires changing the thermocouple type and revalidating the temperature-to-voltage transfer function. Additionally, the package difference (MSOP vs. SOIC) requires a PCB layout change. Substitution is only valid after full validation against the respective manufacturer datasheets.
What output sensitivity do the AD8495ARMZ and AD8494CRMZ provide?
Both devices provide a nominal output sensitivity of 5 mV/°C, making them directly compatible with standard analog-to-digital converter input ranges when appropriate gain and offset are applied.
What is the reference junction compensation range for these devices?
Both the AD8495ARMZ and AD8494CRMZ provide reference junction (cold junction) compensation over a range of 0°C to 50°C, as specified in the manufacturer datasheets.
What supply voltage range do the AD8495ARMZ and AD8494CRMZ require?
Both devices operate from a single supply of 2.7 V to 18 V, or from dual supplies of ±2.7 V to ±18 V, per the manufacturer datasheet specifications.
Do the AD8495ARMZ and AD8494CRMZ include an on-chip temperature sensor for cold junction compensation?
Yes. Both devices integrate an on-chip temperature sensor that provides reference junction compensation for their respective thermocouple types (K-type for the AD8495ARMZ and J-type for the AD8494CRMZ), eliminating the need for external cold junction compensation circuitry.
What are the operating temperature ranges for the AD8495ARMZ and AD8494CRMZ?
Both the AD8495ARMZ and AD8494CRMZ are specified for operation over the industrial temperature range of −40°C to +125°C, per the manufacturer datasheets.