Part A
AD5422AREZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5242 PCS
- Package
- TSSOP-24
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD5420AREZ-REEL7 and AD5422AREZ are both single-channel, 16-bit, serial-input, 4-20 mA current-loop DACs from Analog Devices in a 24-lead TSSOP package, sharing the same core architecture and supply requirements. The AD5422AREZ adds an integrated HART modem interface and additional voltage-output capability, so it can serve as a functional upgrade or replacement for the AD5420AREZ-REEL7 in most loop-powered industrial applications, provided the host firmware accounts for the extended feature set and register map differences.
Resolution and Accuracy
High match
Output Type
High match
Package Type
High match
Interface and Feature Set
Validation required
Parts at a glance
Part B
AD5420AREZ-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2009 PCS
- Package
- TSSOP-24
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5420AREZ-REEL7 | AD5422AREZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit DACs, so resolution is equivalent for precision-critical loops. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture means both fit the same single-loop signal chain. |
| Output Type | Current (4 mA to 20 mA) | Current and Voltage | The AD5422 adds voltage output, enabling applications beyond pure current-loop control. |
| Voltage Output Range | Not available | 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V | Voltage output capability in the AD5422 supports additional actuator and control interfaces. |
| Current Output Range | 4 mA to 20 mA, 0 mA to 20 mA, 0 mA to 24 mA | 4 mA to 20 mA, 0 mA to 20 mA, 0 mA to 24 mA | Identical current ranges allow direct substitution in 4-20 mA loop designs. |
| Interface | SPI | SPI | Same serial interface simplifies firmware and microcontroller compatibility. |
| Supply Voltage | 10.8 V to 40 V (AVDD), 2.7 V to 5.5 V (DVDD) | 10.8 V to 40 V (AVDD), 2.7 V to 5.5 V (DVDD) | Matching supply requirements mean the same power design can be reused. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Equivalent industrial temperature range supports the same harsh environments. |
| Package | 24-Lead TSSOP | 24-Lead TSSOP | Same footprint and package allow drop-in PCB compatibility. |
| Internal Reference | Yes | Yes | Both include an internal reference, reducing external component count. |
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 | AD5422AREZ | AD5420AREZ-REEL7 |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Number of D/A Converters | 1 | 1 |
| Settling Time | 25µs (V), 40µs (A) (Typ) | 40µs |
| Output Type | Voltage or Current - Buffered | Current - Buffered |
| Differential Output | No | No |
| Data Interface | SPI, DSP | SPI, DSP |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 10.8V ~ 40V, -3V ~ 26.4V | 10.8V ~ 40V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| INL / DNL(LSB) | -, ±1.3 (Max) | -, ±1 (Max) |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD5420AREZ-REEL7 and the AD5422AREZ?
The AD5420AREZ-REEL7 is a single-channel, 16-bit, serial-input, 4 mA to 20 mA current-output DAC. The AD5422AREZ is a single-channel, 16-bit, serial-input DAC that provides both a 4 mA to 20 mA current output and a 0 V to 10 V voltage output, plus additional features such as a 5 V reference and programmable current/voltage ranges. The AD5420 is current-output only, while the AD5422 integrates both current and voltage outputs.
Are the AD5420AREZ-REEL7 and AD5422AREZ pin-compatible?
No. The AD5420AREZ-REEL7 is available in a 24-lead TSSOP package, while the AD5422AREZ is available in a 24-lead TSSOP package as well, but the pin functions differ because the AD5422 includes additional voltage-output and reference pins. They are not direct drop-in replacements; the PCB layout and external circuitry must be designed for the specific part.
Can the AD5420AREZ-REEL7 be used as a direct substitute for the AD5422AREZ in an existing design?
No. The AD5420AREZ-REEL7 lacks the voltage output, internal reference, and programmable voltage ranges of the AD5422AREZ. Substitution would require verification of all electrical specifications, pin assignments, and external component requirements against the respective datasheets. A direct replacement is not supported without design changes.
What are the output current ranges of the AD5420AREZ-REEL7 and AD5422AREZ?
Both devices support a 4 mA to 20 mA current output. The AD5420AREZ-REEL7 also supports a 0 mA to 20 mA or 0 mA to 24 mA range, depending on configuration. The AD5422AREZ supports 4 mA to 20 mA, 0 mA to 20 mA, and 0 mA to 24 mA current ranges, plus voltage output ranges of 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V.
Do both parts include an internal reference?
The AD5422AREZ includes an internal 5 V reference. The AD5420AREZ-REEL7 does not include an internal reference and requires an external reference for operation. This is a critical difference for designs that need a self-contained reference source.
What are the operating temperature ranges for the AD5420AREZ-REEL7 and AD5422AREZ?
Both devices are specified for the industrial temperature range of −40°C to +105°C. This is consistent across the A-grade versions in the specified packages.
Which part is more suitable for applications requiring both current and voltage outputs?
The AD5422AREZ is the appropriate choice because it integrates both a current output and a voltage output in a single package. The AD5420AREZ-REEL7 provides only a current output and would require additional external circuitry to achieve a voltage output, if feasible at all within the target specifications.
Are the AD5420AREZ-REEL7 and AD5422AREZ available in the same package type?
Both are offered in a 24-lead TSSOP package. However, the AD5420AREZ-REEL7 is supplied in tape and reel packaging (REEL7), while the AD5422AREZ is typically supplied in trays or tubes depending on the ordering suffix. Package type alone does not guarantee interchangeability due to differing pin functions.