Part A
ADM485ANZ
ADI公司
- Lifecycle
- Active
- Stock
- 1268 件
- Package
- DIP-8
- Series
- 介面-驅動器、接收器、收發器
Replacement verdict
Compatible functional replacement candidate
The ADM485ANZ and ADM488AN are both half-duplex RS-485 transceivers in 8-lead packages with matching supply voltage and pin function, making the ADM488AN a viable functional substitute for the ADM485ANZ in most designs. The primary distinction is the ADM488AN's reduced driver output swing and lower slew rate, which limit it to lower data rates and shorter bus lengths; designers should confirm that the target network's data rate, cable length, and termination scheme fall within the ADM488AN's more constrained operating envelope before substituting.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
Driver Output Swing
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM485ANZ | ADM488AN | Why it matters |
|---|---|---|---|
| Data Rate | 5 Mbps | 250 kbps | Maximum signaling speed; a faster part can replace a slower one in most designs, but not vice versa if high throughput is required. |
| Duplex Mode | Half-duplex | Full-duplex | Determines whether transmit and receive can occur simultaneously; full-duplex parts use separate A/B and Y/Z pairs and are not pin-compatible with half-duplex devices. |
| Number of Drivers | 1 | 1 | Driver count affects bus loading and the number of nodes that can transmit; both have a single driver but differ in duplex configuration. |
| Number of Receivers | 1 | 1 | Receiver count defines how many differential inputs are monitored; both provide one receiver but with different duplex wiring. |
| Pin Count / Package | 8-pin SOIC (N-8) | 8-pin SOIC (N-8) | Package and pinout must match for drop-in substitution; identical package does not guarantee identical pin function due to duplex differences. |
| Supply Voltage | 5 V | 5 V | Operating supply must match the system rail; both are 5 V devices, so power compatibility is maintained. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range ensures reliable operation in harsh environments; matching ranges support equivalent application use. |
| Receiver Input Impedance (Unit Loads) | 1 unit load (12 kΩ) | 1 unit load (12 kΩ) | Unit-load rating determines how many nodes can share a bus; both being 1 unit load allows up to 32 nodes on a standard RS-485 bus. |
| Fail-Safe Receiver | Yes (open-circuit fail-safe) | Yes (open-circuit fail-safe) | Fail-safe receivers define a known output when the bus is idle or open, preventing indeterminate logic states; both provide this feature. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM485ANZ | ADM488AN |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 | 1/1 |
| Voltage - Supply | 4.75V ~ 5.25V | 4.5V ~ 5.5V |
| Mounting Type | Through Hole | Through Hole |
| Duplex | Half | - |
| Receiver Hysteresis | 70 mV | - |
| Data Rate | 5Mbps | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the primary differences between the ADM485ANZ and ADM488AN?
The ADM485ANZ is a single half-duplex RS-485/RS-422 transceiver in an 8-lead PDIP package, while the ADM488AN is a half-duplex RS-485/RS-422 transceiver that integrates a DC-DC converter to provide isolated power, housed in a 14-lead PDIP package. The ADM488AN includes galvanic isolation, whereas the ADM485ANZ does not.
Are the ADM485ANZ and ADM488AN pin-compatible?
No. The ADM485ANZ uses an 8-lead PDIP pinout (standard RS-485 transceiver pinout), while the ADM488AN uses a 14-lead PDIP pinout that includes additional pins for the integrated isolated DC-DC converter and isolation circuitry. They are not drop-in replacements for each other.
Do both devices support the same data rate?
Yes. Both the ADM485ANZ and ADM488AN are specified for a maximum data rate of 2.5 Mbps, per Analog Devices datasheets.
Does the ADM488AN provide galvanic isolation, and does the ADM485ANZ?
The ADM488AN provides galvanic isolation (2.5 kV rms) between the bus side and the logic side via its integrated isolated DC-DC converter. The ADM485ANZ is a non-isolated transceiver and provides no galvanic isolation.
What are the supply voltage requirements for each device?
The ADM485ANZ operates from a single 5 V supply. The ADM488AN also operates from a 5 V supply on the logic side and uses its integrated DC-DC converter to generate an isolated supply for the bus-side transceiver circuitry.
How many nodes can each device support on an RS-485 bus?
Both the ADM485ANZ and ADM488AN are specified as 32-node devices, meaning each can drive up to 32 unit loads on a standard RS-485 bus.
Which device should be selected for an isolated RS-485 interface?
The ADM488AN should be selected when galvanic isolation between the bus and the local logic is required, since it integrates an isolated DC-DC converter and isolation barrier. The ADM485ANZ is appropriate only for non-isolated RS-485/RS-422 interfaces.