Part A
ADM4851ARZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4442 ПКС
- Package
- SOIC-8
- Series
- Интерфейс - драйверы, приемники, передатчики
Replacement verdict
Compatible functional replacement candidate
The ADM4853ARZ and ADM4851ARZ are both half-duplex RS-485/RS-422 transceivers in the same 8-lead SOIC package with identical supply voltage and pin function, making the ADM4853ARZ a viable functional replacement candidate for the ADM4851ARZ in most designs. However, the two devices differ in their data rate and slew-rate characteristics, so signal integrity and bus-length requirements should be validated before substitution.
Package Type
High match
Supply Voltage
High match
Data Rate
Validation required
Slew Rate
Validation required
Parts at a glance
Part B
ADM4853ARZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6517 ПКС
- Package
- SOIC-8
- Series
- Интерфейс - драйверы, приемники, передатчики
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM4853ARZ | ADM4851ARZ | Why it matters |
|---|---|---|---|
| Data Rate | 10 Mbps | 500 kbps | Maximum signaling speed; a 20x difference determines whether the part suits high-speed or low-speed buses. |
| Duplex Mode | Full duplex | Half duplex | Full duplex allows simultaneous transmit/receive on separate pairs, while half duplex shares one pair; this changes bus topology and pin usage. |
| Number of Drivers/Receivers | 1 driver / 1 receiver | 1 driver / 1 receiver | Confirms the transceiver channel count; identical here, so channel capacity is not a differentiator. |
| Receiver Input Impedance (Unit Loads) | 1 unit load (standard) | 1 unit load (standard) | Determines how many nodes can share the bus; both are standard 1-unit-load devices supporting up to 32 nodes. |
| Supply Voltage | 5 V | 5 V | Operating supply rail; both require 5 V, so power supply design is compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature rating; identical ranges mean equivalent environmental robustness. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Footprint and assembly compatibility; identical packages allow drop-in board replacement. |
| Fail-Safe Receiver | Yes (open-circuit, short-circuit, idle-bus) | Yes (open-circuit, short-circuit, idle-bus) | Guarantees a defined logic output when the bus is undriven; both provide this, so behavior on floating lines is equivalent. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Bus-pin ESD robustness; identical ratings mean comparable field reliability. |
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 | ADM4851ARZ | ADM4853ARZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 | 1/1 |
| Duplex | Half | Half |
| Receiver Hysteresis | 20 mV | 20 mV |
| Data Rate | 500kbps | 10Mbps |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADM4853ARZ and ADM4851ARZ?
Both are 5 V, half-duplex RS-485/RS-422 transceivers in an 8-lead SOIC package, but they differ in data rate and slew-rate behavior. The ADM4853ARZ is specified for data rates up to 10 Mbps, while the ADM4851ARZ is a limited-slew-rate version specified for data rates up to 500 kbps, which reduces EMI and improves signal integrity on long cables.
Are the ADM4853ARZ and ADM4851ARZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with the same pinout (RO, RE, DE, DI, GND, A, B, VCC), so they are pin-compatible and share the same PCB land pattern.
Can the ADM4853ARZ be used as a drop-in replacement for the ADM4851ARZ?
Electrically they are pin-compatible, but the ADM4853ARZ supports up to 10 Mbps with faster output edges, whereas the ADM4851ARZ is slew-rate limited to 500 kbps. Substitution is acceptable only if the higher data rate and faster edges of the ADM4853ARZ do not cause EMI or signal-integrity issues in the target design; otherwise the ADM4851ARZ should be retained.
What supply voltage and bus interface do these transceivers support?
Both the ADM4853ARZ and ADM4851ARZ operate from a single 5 V supply and provide half-duplex RS-485/RS-422 differential bus signaling, with a driver output and receiver input compliant with the RS-485/RS-422 standards.
How many nodes can be connected on the bus with these transceivers?
Both devices are specified as 1/8-unit-load (1/8 UL) receivers, allowing up to 256 transceivers to be connected on a single RS-485 bus, provided the bus is properly terminated and biased.
Do the ADM4853ARZ and ADM4851ARZ include fail-safe receiver behavior?
Yes. Both devices feature a fail-safe receiver that guarantees a known logic-high output when the bus inputs are open, shorted, or terminated but undriven, preventing indeterminate output states.
What is the operating temperature range for these parts?
Both the ADM4853ARZ and ADM4851ARZ are specified for the industrial temperature range of −40 °C to +85 °C, making them suitable for industrial networking and control applications.
Which part should be selected for long-cable or noisy industrial networks?
The ADM4851ARZ is generally preferred for long-cable or EMI-sensitive networks because its limited slew rate (500 kbps maximum) reduces radiated emissions and reflections. The ADM4853ARZ should be selected only when data rates up to 10 Mbps are required and the cabling and layout can support the faster edges.