Part A
ADM485ANZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1268 PCS
- Package
- DIP-8
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The ADM488ANZ is a viable functional replacement candidate for the ADM485ANZ in many RS-485 designs, as both share the same 8-pin SOIC footprint, 5 V supply, and half-duplex RS-485 transceiver architecture. However, the ADM488ANZ offers a higher maximum data rate and a wider operating temperature range, while its receiver input impedance and unit-load characteristics differ, so the system-level bus loading and termination strategy should be validated before substitution.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
Operating Temperature Range
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 | ADM488ANZ | Why it matters |
|---|---|---|---|
| Duplex Mode | Half-duplex | Full-duplex | Half-duplex shares one pair for transmit/receive, while full-duplex uses separate pairs for simultaneous bidirectional communication; this fundamentally changes bus wiring and cannot be substituted without redesign. |
| Number of Drivers / Receivers | 1 driver, 1 receiver | 1 driver, 1 receiver | Both provide a single differential driver and receiver, but the full-duplex ADM488 routes them on independent pins, affecting pinout compatibility. |
| Pin Count / Package | 8-lead SOIC_N (R-8) | 8-lead SOIC_N (R-8) | Same package footprint, but pin functions differ between half- and full-duplex variants, so a direct drop-in replacement is not possible. |
| Pinout Configuration | A, B, DI, RO, DE, RE, VCC, GND | A, B, Z, Y, DI, RO, VCC, GND | The ADM488 exposes separate Y/Z driver outputs and A/B receiver inputs for full-duplex, whereas the ADM485 uses shared A/B lines with DE/RE control; boards must be rewired. |
| Data Rate | 2.5 Mbps | 2.5 Mbps | Identical maximum signaling rate means both suit the same RS-485 network speeds. |
| Supply Voltage | 5 V (4.75 V to 5.25 V) | 5 V (4.75 V to 5.25 V) | Both operate from a single 5 V supply, so power rail requirements are interchangeable. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range supports the same environmental conditions. |
| Driver Output / Receiver Input Common-Mode Range | -7 V to +12 V | -7 V to +12 V | Same RS-485 common-mode range ensures equivalent noise immunity and interoperability on the bus. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Equivalent ESD robustness on the bus pins provides the same level of field protection. |
| Receiver Input Impedance (Unit Load) | 1 unit load (12 kΩ min) | 1 unit load (12 kΩ min) | Both present one unit load, allowing up to 32 nodes on a standard RS-485 bus. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM485ANZ | ADM488ANZ |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 | 1/1 |
| Duplex | Half | Full |
| Receiver Hysteresis | 70 mV | 70 mV |
| Data Rate | 5Mbps | 250kbps |
| Voltage - Supply | 4.75V ~ 5.25V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Through Hole | Through Hole |
Frequently asked questions
What are the key differences between the ADM485ANZ and ADM488ANZ?
The ADM485ANZ is a single half-duplex RS-485/RS-422 transceiver, while the ADM488ANZ is a dual half-duplex RS-485/RS-422 transceiver containing two independent drivers and receivers in one package. Both are 5 V devices in 8-lead PDIP packages from Analog Devices, but the ADM488ANZ integrates two complete transceiver channels, whereas the ADM485ANZ provides only one.
Are the ADM485ANZ and ADM488ANZ pin-compatible?
No. The ADM485ANZ is an 8-lead device with a single transceiver pinout (RO, RE, DE, DI, GND, A, B, VCC), while the ADM488ANZ is an 8-lead device that houses two transceivers with a different pin assignment. Because the pin functions differ, they are not drop-in replacements for each other.
What data rate do the ADM485ANZ and ADM488ANZ support?
Both the ADM485ANZ and ADM488ANZ are specified for data rates up to 2.5 Mbps, making them suitable for standard RS-485/RS-422 communication links.
Do both devices operate from a single 5 V supply?
Yes. Both the ADM485ANZ and ADM488ANZ operate from a single 5 V ±5% supply, consistent with the standard Analog Devices ADM485/ADM488 family specifications.
How many nodes can each device support on an RS-485 bus?
Both the ADM485ANZ and ADM488ANZ feature a 1/4 unit load receiver input impedance, allowing up to 32 transceivers to be connected on a single RS-485 bus.
What is the difference in driver/receiver count between the two parts?
The ADM485ANZ contains one differential driver and one differential receiver (1 driver / 1 receiver). The ADM488ANZ contains two differential drivers and two differential receivers (2 drivers / 2 receivers), providing two independent half-duplex channels in a single package.
Are both devices available in the same package type?
Yes. Both the ADM485ANZ and ADM488ANZ are offered in 8-lead PDIP (N) packages, though their internal pin assignments differ because the ADM488ANZ integrates two transceivers.
Which part should be selected for a design requiring two independent RS-485 channels?
The ADM488ANZ should be selected, as it integrates two complete half-duplex RS-485/RS-422 transceivers in a single 8-lead package, whereas the ADM485ANZ provides only a single channel and would require two devices to achieve the same functionality.