Part A
AD5422BREZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5465 PCS
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD5420AREZ and AD5422BREZ are both single-channel 16-bit current-output DACs from the AD542x family, sharing a common TSSOP-24 footprint and 4–20 mA output architecture. However, they differ in HART signal interface capability, voltage output support, and specified accuracy grade, so the AD5422BREZ can serve as a functional upgrade in many designs but requires validation of the HART coupling network and any voltage-mode requirements before direct substitution.
Output Type
High match
HART Interface
Validation required
Voltage Output Capability
Validation required
Package Type
High match
Parts at a glance
Part B
AD5420AREZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2718 PCS
- Package
- TSSOP-24
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD5422BREZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Determines the smallest output step the DAC can produce; both are 16-bit, so resolution is equivalent. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture means both fit the same single-loop control designs. |
| Output Type | Current (4 mA to 20 mA) | Current and Voltage (4 mA to 20 mA, 0 V to 5 V, 0 V to 10 V, ±10 V) | The AD5422 supports both current and voltage outputs, offering greater flexibility than the current-only AD5420. |
| Supply Voltage Range | 10.8 V to 40 V (AVDD) | 10.8 V to 40 V (AVDD) | Wide compliance range allows operation in industrial loop-powered systems; both share the same AVDD range. |
| Interface | SPI | SPI | Both use a serial SPI interface, simplifying drop-in replacement in existing digital control paths. |
| Package | 24-Lead TSSOP | 24-Lead TSSOP | Identical package and pin count allow the same PCB footprint to be reused. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +105 °C | The AD5422 supports a wider temperature range, making it suitable for harsher industrial environments. |
| Internal Reference | 5 V, 10 ppm/°C max | 5 V, 10 ppm/°C max | On-chip reference reduces external component count and improves accuracy; both provide the same reference. |
| Output Accuracy (INL) | ±0.01% FSR max | ±0.01% FSR max | Integral nonlinearity defines output linearity; identical INL means comparable precision in control loops. |
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 | AD5422BREZ | AD5420AREZ |
|---|---|---|
| Part Status | Active | Active |
| Base Product Number | AD5422 | - |
| Number of Bits | 16 | 16 |
| Number of D / A Converters | 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) | - |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | - |
| Packaging | Tube | - |
| Number of D/A Converters | - | 1 |
| INL / DNL(LSB) | - | -, ±1 (Max) |
Frequently asked questions
What are the primary functional differences between the AD5420AREZ and AD5422BREZ?
The AD5420AREZ is a single-channel, 16-bit, serial input, 4 mA to 20 mA, current source DAC with HART connectivity. The AD5422BREZ is a single-channel, 16-bit, serial input, voltage and current output DAC that includes a 4 mA to 20 mA current output plus a 0 V to 5 V, 0 V to 10 V, ±5 V, or ±10 V voltage output, and also supports HART connectivity. The AD5422BREZ therefore provides both voltage and current outputs, while the AD5420AREZ provides only a current output.
Are the AD5420AREZ and AD5422BREZ pin-compatible?
No. The AD5420AREZ is supplied in a 24-lead TSSOP (RE-24-1) package, while the AD5422BREZ is supplied in a 24-lead TSSOP (RE-24-1) package as well, but the pin functions differ because the AD5422BREZ includes additional voltage-output pins and associated circuitry. They are not direct pin-for-pin replacements.
Can the AD5420AREZ be used as a drop-in replacement for the AD5422BREZ in an existing design?
No. Although both devices share a similar serial interface and HART capability, the AD5422BREZ provides voltage output modes and additional pins that the AD5420AREZ does not support. A design expecting voltage output or the specific pin configuration of the AD5422BREZ cannot use the AD5420AREZ without hardware and software changes.
Do both devices support HART communication?
Yes. Both the AD5420AREZ and AD5422BREZ include a HART connectivity feature that allows a HART signal to be superimposed on the 4 mA to 20 mA current output, enabling digital communication in industrial process control applications.
What are the output voltage ranges available on the AD5422BREZ that are not available on the AD5420AREZ?
The AD5422BREZ provides selectable voltage output ranges of 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V. The AD5420AREZ does not provide any voltage output mode; it is limited to a 4 mA to 20 mA current output.
What is the resolution and accuracy specification common to both the AD5420AREZ and AD5422BREZ?
Both devices are 16-bit DACs. The AD5420AREZ offers 16-bit resolution for its current output. The AD5422BREZ offers 16-bit resolution for both its current and voltage outputs. For detailed accuracy specifications such as INL, DNL, offset error, and gain error, refer to the respective manufacturer datasheets, as these parameters may differ between the two models.
Which device is more suitable for applications requiring both voltage and current outputs?
The AD5422BREZ is the appropriate choice for applications requiring both voltage and current outputs, because it integrates both output types in a single package. The AD5420AREZ is suitable only for applications requiring a 4 mA to 20 mA current output.
Do the AD5420AREZ and AD5422BREZ operate from the same supply voltages?
Both devices typically operate from an AVDD supply of 12 V to 60 V for the current output stage and a DVDD supply of 2.7 V to 5.5 V for the digital interface. However, the AD5422BREZ also requires additional supply rails for its voltage output modes, such as AVSS and additional reference considerations. Always verify the exact supply requirements in the official datasheets before designing.