Part A
AD8495CRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5995 Stückzahl
- Package
- MSOP-8
- Series
- Sensor- und Detektorschnittstellen
Replacement verdict
Compatible functional replacement candidate
The AD8495CRMZ and AD8494CRMZ are functionally interchangeable thermocouple amplifier candidates, sharing the same package, supply range, and output configuration, with the primary distinction being the factory-set thermocouple type and corresponding temperature range. Designers should confirm the intended thermocouple type and calibration before substituting one for the other in a given application.
Package Type
High match
Output Type
High match
Supply Voltage Range
High match
Thermocouple Type and Temperature Range
Validation required
Parts at a glance
Part B
AD8494CRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7989 Stückzahl
- Package
- TSSOP-8
- Series
- Sensor- und Detektorschnittstellen
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8495CRMZ | AD8494CRMZ | Why it matters |
|---|---|---|---|
| Sensor Type | K-Type Thermocouple | J-Type Thermocouple | Determines which thermocouple the amplifier is calibrated for; using the wrong type produces incorrect temperature readings. |
| Output Voltage at 25°C (Ambient) | 5.0 mV/°C × 25°C = 125 mV (K-type, 41 µV/°C) | 5.0 mV/°C × 25°C = 125 mV (J-type, 52 µV/°C) | The output scaling differs because the internal gain is set for the specific thermocouple sensitivity; the transfer function is not interchangeable. |
| Thermocouple Sensitivity (Seebeck Coefficient) | ~41 µV/°C (K-type) | ~52 µV/°C (J-type) | The amplifier gain is factory-trimmed to the thermocouple's Seebeck coefficient, so the two parts are not functionally substitutable. |
| Temperature Range (Typical) | 0°C to +50°C reference, thermocouple range up to ~+1000°C (K-type) | 0°C to +50°C reference, thermocouple range up to ~+750°C (J-type) | The usable measurement range depends on the thermocouple type; J-type has a lower maximum temperature than K-type. |
| Supply Voltage Range | 2.7 V to 18 V (single supply) | 2.7 V to 18 V (single supply) | Both parts share the same supply requirements, so power supply design is identical. |
| Supply Current (Typical) | ~180 µA | ~180 µA | Identical quiescent current means no change in power budget when substituting. |
| Package | 8-Lead MSOP (RMZ) | 8-Lead MSOP (RMZ) | Same footprint and pinout allow drop-in PCB compatibility. |
| Operating Temperature Range | −40°C to +125°C | −40°C to +125°C | Identical industrial temperature rating ensures equivalent environmental robustness. |
| Output Type | Analog voltage output (ratiometric to temperature) | Analog voltage output (ratiometric to temperature) | Both provide the same analog interface style, simplifying downstream ADC design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8495CRMZ | 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 is the primary functional difference between the AD8495CRMZ and the AD8494CRMZ?
Both are thermocouple amplifiers with cold junction compensation, but they are optimized for different thermocouple types. The AD8495CRMZ is calibrated for Type K thermocouples, providing a 5 mV/°C output, while the AD8494CRMZ is calibrated for Type J thermocouples, providing a 5 mV/°C output with a different internal cold junction compensation curve.
Are the AD8495CRMZ and AD8494CRMZ pin-compatible?
Yes. Both devices are offered in the same 8-lead MSOP (RM) package and share an identical pinout, allowing them to be used interchangeably on the same PCB layout when the thermocouple type and compensation are adjusted accordingly.
What is the output voltage range and supply requirement for these devices?
Both the AD8495CRMZ and AD8494CRMZ operate from a single supply of 2.7 V to 18 V (or dual supplies) and provide a rail-to-rail output voltage that is proportional to the thermocouple temperature at 5 mV/°C, referenced to the supply midpoint or a defined reference pin.
Can the AD8495CRMZ be used with a Type J thermocouple?
No. The AD8495CRMZ contains cold junction compensation and linearization optimized specifically for Type K thermocouples. Using it with a Type J thermocouple would produce inaccurate temperature readings because the compensation curve and sensitivity coefficients differ from the AD8494CRMZ.
What is the operating temperature range for the AD8495CRMZ and AD8494CRMZ?
Both devices are specified for the industrial temperature range of −40°C to +125°C, making them suitable for harsh-environment thermocouple measurement applications.
Do these amplifiers include cold junction compensation?
Yes. Both the AD8495CRMZ and AD8494CRMZ integrate cold junction compensation circuitry and a thermocouple linearization network on-chip, eliminating the need for external compensation components and simplifying thermocouple signal conditioning design.
What package type do the AD8495CRMZ and AD8494CRMZ use?
Both parts are supplied in an 8-lead MSOP (Mini Small Outline Package) designated by the "RM" suffix in the part number, and they are RoHS-compliant.