Part A
AD694ARZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4975 PCS
- Package
- SOIC-16
- Series
- Interface - interface pour capteurs et détecteurs
Replacement verdict
Compatible functional replacement candidate
The AD694ARZ and AD694JR are functionally equivalent voltage-to-current transmitters sharing the same core architecture, pinout, and 4-20 mA output capability, making them viable substitutes in most designs. The primary distinction is the specified operating temperature range, where the AD694ARZ offers an extended industrial-grade window compared to the AD694JR. Designers should confirm that the AD694JR's narrower temperature specification satisfies the target application's environmental requirements before committing to a direct swap.
Output Type
High match
Package Type
High match
Operating Temperature Range
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
AD694JR
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3474 PCS
- Package
- SOIC-16
- 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 | AD694ARZ | AD694JR | Why it matters |
|---|---|---|---|
| Package / Mounting | 16-Lead SOIC (surface mount) | 16-Lead SOIC (surface mount) | Both are SOIC, but the ARZ and JR suffixes denote different temperature/grade screening, which affects board-level reliability in the target environment. |
| Temperature Range (Operating) | -40°C to +85°C (industrial) | 0°C to +70°C (commercial) | The wider industrial range of the ARZ allows use in harsher environments where the commercial-grade JR may not be specified to operate. |
| Grade / Screening | A grade (industrial) | J grade (commercial) | Grade determines guaranteed specifications over temperature; substituting a J-grade part for an A-grade part may violate system accuracy requirements. |
| Function | Voltage-to-current transmitter (4-20 mA) | Voltage-to-current transmitter (4-20 mA) | Both perform the same core signal-conditioning function, so they are functionally interchangeable at the block level. |
| Output Current Range | 4 mA to 20 mA | 4 mA to 20 mA | Identical output span ensures the same loop current signaling is produced, preserving compatibility with downstream receivers. |
| Supply Voltage | +4.5 V to +36 V (single supply) | +4.5 V to +36 V (single supply) | Matching supply range means the same power rail can be used without redesign of the power section. |
| Input Voltage Range | 0 V to 2 V (or 0 V to 10 V, selectable) | 0 V to 2 V (or 0 V to 10 V, selectable) | Identical input ranges allow the same sensor or DAC front-end to drive either part without recalibration. |
| Package Pin Count | 16 | 16 | Same pin count and SOIC footprint enable drop-in PCB compatibility between the two variants. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD694ARZ | AD694JR |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Type | Current Transmitter | Current Transmitter |
| Input Type | Voltage | Voltage |
| Output Type | Voltage | Voltage |
| Supply Current | 23 mA | 23 mA |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD694ARZ and AD694JR?
The primary difference is the grade and package. The AD694ARZ is a RoHS-compliant, 16-lead SOIC (R-16) device specified over the industrial temperature range of −40°C to +85°C. The AD694JR is a 16-lead SOIC (R-16) device specified over the commercial temperature range of 0°C to +70°C and is not RoHS-compliant. Both are monolithic voltage-to-current transmitters with identical functional blocks and pinouts.
Are the AD694ARZ and AD694JR functionally interchangeable?
Yes, both devices share the same functional architecture: a voltage-to-current amplifier, input buffer, 4 mA offset and span adjustment, and a 4–20 mA output stage. They have identical pin configurations on the 16-lead SOIC package, so a board designed for one can accept the other, provided the temperature range and RoHS requirements of the application are satisfied.
What is the specified operating temperature range for each part?
The AD694ARZ is specified for the industrial temperature range of −40°C to +85°C. The AD694JR is specified for the commercial temperature range of 0°C to +70°C. Designs exposed to sub-zero or elevated ambient conditions should use the ARZ grade.
Does the AD694ARZ meet RoHS requirements while the AD694JR does not?
Yes. The AD694ARZ is supplied in a RoHS-compliant 16-lead SOIC package, indicated by the "Z" suffix in the part number. The AD694JR uses the non-RoHS 16-lead SOIC package. For products requiring RoHS compliance, the AD694ARZ is the appropriate choice.
What output current range do both devices provide?
Both the AD694ARZ and AD694JR are 4–20 mA voltage-to-current transmitters. The output span is set by external resistors, and the devices support a standard 4–20 mA current loop output suitable for industrial process control and sensor interfacing.
What supply voltage range do the AD694ARZ and AD694JR require?
Both devices operate from a single supply voltage in the range of 4.5 V to 36 V, or from dual supplies. The wide supply range allows operation from standard 5 V, 12 V, or 24 V industrial rails, and the output stage can drive the 4–20 mA loop with adequate headroom.
Can the AD694JR be used as a drop-in replacement for the AD694ARZ in an existing design?
Electrically and mechanically, the AD694JR is a drop-in replacement for the AD694ARZ on the same 16-lead SOIC footprint. However, the substitution is only acceptable if the application's ambient temperature stays within 0°C to +70°C and RoHS compliance is not required. Otherwise, the AD694ARZ should be retained.