Part A
AD8021ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2172 Stückzahl
- Package
- MSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8021ARMZ and AD8021ARM are functionally equivalent voltage-feedback operational amplifiers from Analog Devices, sharing the same core die, supply range, bandwidth, and pinout. The only distinction is the RoHS-compliant molding compound and lead finish of the ARMZ suffix versus the non-RoHS ARM version, making the ARMZ a direct drop-in replacement in electrically and mechanically identical applications.
Package Type
High match
Pin Configuration
High match
Electrical Specifications
High match
RoHS Compliance
Validation required
Parts at a glance
Part B
AD8021ARM
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2598 Stückzahl
- Package
- TSSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8021ARMZ | AD8021ARM | Why it matters |
|---|---|---|---|
| Amplifier Type | Voltage Feedback | Voltage Feedback | Both are voltage-feedback op amps, so the feedback topology and compensation approach are interchangeable. |
| Number of Circuits | 1 | 1 | Single-channel configuration must match for pin-compatible substitution in a given socket. |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | Identical package and footprint allow drop-in board replacement without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting style ensures mechanical compatibility on the PCB. |
| Gain Bandwidth Product | 490 MHz | 490 MHz | Bandwidth determines achievable signal frequency and closed-loop stability; identical values preserve AC performance. |
| Slew Rate | 460 V/µs | 460 V/µs | Slew rate limits large-signal response; matching values keep transient behavior consistent. |
| Input Offset Voltage | 400 µV (max) | 400 µV (max) | Offset voltage affects DC accuracy; identical specs mean equivalent precision in the application. |
| Supply Voltage Range | ±2.25 V to ±12 V (4.5 V to 24 V total) | ±2.25 V to ±12 V (4.5 V to 24 V total) | Operating supply range must match to ensure the part works within the existing power rails. |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | Temperature rating determines suitability for the target environment; identical ratings ensure equivalent reliability. |
| RoHS / Lead-Free Status | RoHS Compliant, Lead-Free | Non-RoHS (contains lead) | The "Z" suffix denotes RoHS-compliant lead-free construction; this affects regulatory compliance and solder process compatibility. |
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 | AD8021ARMZ | AD8021ARM |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 1 | 1 |
| Slew Rate | 460V/µs | 460V/µs |
| -3 dB Bandwidth | 560 MHz | 560 MHz |
| Current - Input Bias | 7.5 µA | 7.5 µA |
| Voltage - Input Offset | 400 µV | 400 µV |
| Supply Current | 7.8mA | 7.8mA |
| Current - Output / Channel | 70 mA | 70 mA |
| Voltage - Supply Span(Min) | 4.5 V | 4.5 V |
| Voltage - Supply Span(Max) | 24 V | 24 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the AD8021ARMZ and the AD8021ARM?
The AD8021ARMZ and AD8021ARM are the same AD8021 high-speed voltage-feedback operational amplifier die in an 8-lead MSOP (RM) package. The suffix "Z" on AD8021ARMZ denotes RoHS-compliant, lead-free (Pb-free) construction and packaging, while AD8021ARM is the non-RoHS legacy ordering code. Electrical performance is identical between the two orderable part numbers.
Are the AD8021ARMZ and AD8021ARM electrically and functionally interchangeable?
Yes. Both part numbers share the same AD8021 datasheet specifications, including the same pinout, supply range, bandwidth, and package outline. The only documented difference is the RoHS/lead-free status indicated by the "Z" suffix, so they are functionally interchangeable in the same PCB footprint.
What package do the AD8021ARMZ and AD8021ARM use?
Both devices are supplied in the 8-lead MSOP package, identified by the "RM" package code in the Analog Devices ordering guide. The package body, lead count, and pin assignments are the same for both orderable part numbers.
Does the "Z" suffix on AD8021ARMZ affect electrical specifications?
No. The "Z" suffix is an Analog Devices RoHS-compliant designation and does not change the amplifier's electrical parameters. Datasheet specifications such as gain bandwidth, slew rate, input offset voltage, and supply current apply equally to AD8021ARMZ and AD8021ARM.
Which part number should be used for a RoHS-compliant design?
AD8021ARMZ should be specified for RoHS-compliant assemblies because the "Z" suffix confirms lead-free, RoHS-compliant construction. AD8021ARM is the non-RoHS legacy code and should not be selected where RoHS compliance is required.
Can AD8021ARM be used as a drop-in replacement for AD8021ARMZ?
Electrically and mechanically they are drop-in equivalents because both use the same AD8021 die and 8-lead MSOP package. However, substituting AD8021ARM for AD8021ARMZ may violate RoHS compliance requirements, so the substitution should only be made where non-RoHS parts are acceptable and permitted by the design's compliance rules.
Do both part numbers share the same datasheet and pinout?
Yes. AD8021ARMZ and AD8021ARM are covered by the same Analog Devices AD8021 datasheet and ordering guide, and both use the identical 8-lead MSOP pinout. Designers can reference a single datasheet for either orderable part number.