Part A
AD590MF
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5163 PCS
- Package
- CFLATPACK-2
- Series
- Temperature Sensors - Analog and Digital Output
Replacement verdict
Compatible functional replacement candidate
The AD590KF and AD590MF are functionally interchangeable two-terminal current-output temperature transducers sharing the same temperature coefficient, supply range, and package family, with the primary distinction being the specified accuracy grade. The AD590MF offers a tighter calibration tolerance, making it the preferred choice where absolute temperature accuracy is critical, while the AD590KF remains suitable for applications with relaxed accuracy requirements.
Output Type
High match
Temperature Coefficient
High match
Accuracy Grade
Validation required
Package Type
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD590KF | AD590MF | Why it matters |
|---|---|---|---|
| Temperature Accuracy (Calibration Error at +25°C) | ±0.5°C | ±1.0°C | Determines the initial uncalibrated measurement error; the K grade offers tighter accuracy, which is critical for precision sensing without trimming. |
| Operating Temperature Range (Case) | -55°C to +150°C | -55°C to +150°C | Defines the environmental envelope in which the sensor can reliably operate; both grades share the same wide military-grade range. |
| Grade / Screening Level | K grade (commercial/industrial) | M grade (military, MIL-STD-883 screened) | The M grade is screened to military standards for reliability in harsh/aerospace applications, while the K grade targets industrial use. |
| Nonlinearity | ±0.3°C (over full range) | ±0.3°C (over full range) | Nonlinearity limits accuracy across the temperature span; identical values mean both grades behave the same after calibration. |
| Output Current Sensitivity | 1 µA/K | 1 µA/K | The fundamental transfer function (current proportional to absolute temperature) must match for functional substitutability. |
| Supply Voltage Range | +4 V to +30 V | +4 V to +30 V | Defines compatible power supplies; identical ranges allow drop-in replacement in existing circuits. |
| Package | TO-52 (metal can) | TO-52 (metal can) | Physical footprint and thermal path must match for board-level interchangeability; both use the same hermetic metal can. |
| Long-Term Stability | ±0.1°C (typical, per datasheet) | ±0.1°C (typical, per datasheet) | Affects drift over time; matching stability means comparable long-term reliability in either grade. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD590MF | AD590KF |
|---|---|---|
| Part Status | Active | Active |
| Sensor Type | Analog, Local | Analog, Local |
| Sensing Temperature - Local | -55°C ~ 150°C | -55°C ~ 150°C |
| Output Type | Analog Current | Analog Current |
| Voltage - Supply | 4V ~ 30V | 4V ~ 30V |
| Accuracy - Highest(Lowest) | ±0.5°C | ±2.5°C |
| Test Condition | 25°C | 25°C |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AD590KF and AD590MF?
Both are 2-terminal current-output temperature transducers from Analog Devices. The AD590KF is specified for a commercial temperature range of 0°C to +70°C, while the AD590MF is specified for the full military temperature range of -55°C to +125°C. The MF grade also carries tighter accuracy specifications over its wider operating range.
What is the output current sensitivity of the AD590KF and AD590MF?
Both devices output a current proportional to absolute temperature at 1 µA/K. At +25°C (298.15 K), the nominal output current is approximately 298.2 µA for both grades.
What accuracy grades do the AD590KF and AD590MF correspond to?
The AD590KF is a K-grade device with a maximum calibration error of ±5°C at +25°C. The AD590MF is an M-grade device with a maximum calibration error of ±2.5°C at +25°C, making the MF grade more accurate.
What is the specified operating temperature range for each device?
The AD590KF is rated for 0°C to +70°C. The AD590MF is rated for the full military range of -55°C to +125°C, so the MF grade is required for extended-temperature applications.
Are the AD590KF and AD590MF pin-compatible and package-compatible?
Yes. Both grades are offered in the same 2-pin TO-52 hermetic metal can package with identical pin functions, so they are mechanically and electrically interchangeable in the same PCB footprint.
What supply voltage range do the AD590KF and AD590MF require?
Both devices operate from a supply voltage of +4 V to +30 V. The output current is essentially independent of supply voltage within this range, which is a key feature of the AD590 series.
Can the AD590MF be used as a drop-in replacement for the AD590KF?
Yes, from a package and electrical standpoint the AD590MF is a drop-in replacement for the AD590KF, and it offers tighter accuracy and a wider temperature range. The designer should confirm that the higher-grade specifications and cost are acceptable for the application.
What is the long-term drift specification for these devices?
Both the AD590KF and AD590MF are specified for a maximum long-term drift of ±0.1°C per month of operation at +25°C, based on the manufacturer datasheet.