Part A
MAX487EESA
類比設備股份有限公司/Maxim集成
- Lifecycle
- Active
- Stock
- 7168 件
- Package
- SOIC-8
- Series
- 介面-驅動器、接收器、收發器
Replacement verdict
Compatible functional replacement candidate
The MAX487EESA and MAX485ECSA are functionally compatible RS-485/RS-422 transceivers in identical 8-pin SOIC packages, sharing the same supply voltage, data rate, and pinout. The MAX487EESA offers a higher receiver input impedance permitting up to 128 nodes on the bus versus 32 for the MAX485ECSA, making it a viable drop-in replacement in most designs with the caveat that bus loading calculations should be revalidated.
Package Type
High match
Supply Voltage
High match
Data Rate
High match
Receiver Input Impedance
Validation required
Parts at a glance
Part B
MAX485ECSA
類比設備股份有限公司/Maxim集成
- Lifecycle
- Active
- Stock
- 9638 件
- Series
- 介面-驅動器、接收器、收發器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | MAX487EESA | MAX485ECSA | Why it matters |
|---|---|---|---|
| Data Rate | 250 kbps | 2.5 Mbps | Determines the maximum communication speed the transceiver can support; a lower rate part cannot substitute for a higher rate application. |
| Duplex Mode | Half-duplex | Half-duplex | Defines whether the device can transmit and receive simultaneously; both are half-duplex so this is functionally compatible. |
| Number of Drivers/Receivers | 1/1 | 1/1 | Indicates the channel count per package; matching counts ensures pin and functional compatibility. |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | Both operate from a standard 5 V supply, so power rail compatibility is maintained. |
| Operating Temperature Range | -40°C to +85°C | 0°C to +70°C | The extended temperature range of the MAX487EESA allows use in industrial environments where the commercial-grade MAX485ECSA may not be reliable. |
| Package / Mounting Type | 8-SOIC (Surface Mount) | 8-SOIC (Surface Mount) | Identical package and mounting allow direct PCB footprint compatibility. |
| Fail-Safe Receiver | Yes | No | Fail-safe receivers guarantee a defined logic-high output when inputs are open or shorted, preventing undefined states in the MAX485ECSA. |
| Current-Limiting / Thermal Shutdown | Yes | No | Protection features prevent damage under fault conditions; the MAX487EESA offers additional robustness not present in the MAX485ECSA. |
| Driver Output Voltage (Loaded) | ±1.5 V min (54 Ω load) | ±1.5 V min (54 Ω load) | Ensures both devices meet RS-485 differential output requirements for reliable bus communication. |
| Receiver Input Sensitivity | ±200 mV | ±200 mV | Standard RS-485 sensitivity threshold; matching values confirm interoperability on the same bus. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | MAX487EESA | MAX485ECSA |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers / Receivers | - | 1/1 |
| Duplex | Half | Half |
| Receiver Hysteresis | 70 mV | 70 mV |
| Data Rate | 250kbps | 2.5Mbps |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | - | MAX485 |
| Number of Drivers/Receivers | 1/1 | - |
Frequently asked questions
What are the key differences between the MAX487EESA and MAX485ECSA?
The MAX487EESA and MAX485ECSA are both ±15kV ESD-protected, low-power, half-duplex RS-485/RS-422 transceivers from Analog Devices (Maxim Integrated). The primary differences are the data rate, quiescent supply current, and package. The MAX487EESA is specified for 250kbps data rate with a 120µA typical quiescent current and is offered in an 8-pin SOIC package. The MAX485ECSA is specified for 2.5Mbps data rate with a 300µA typical quiescent current and is offered in an 8-pin SOIC package. Both operate from a single +5V supply.
Are the MAX487EESA and MAX485ECSA pin-compatible?
Yes. Both devices are offered in an 8-pin SOIC package with the same pinout: RO (pin 1), RE (pin 2), DE (pin 3), DI (pin 4), GND (pin 5), A (pin 6), B (pin 7), and VCC (pin 8). This allows them to share the same PCB footprint.
Can the MAX487EESA and MAX485ECSA be used interchangeably in an existing design?
Not unconditionally. While they are pin-compatible and share the same supply voltage and RS-485/RS-422 interface, the MAX487EESA is limited to 250kbps while the MAX485ECSA supports up to 2.5Mbps. Substitution is acceptable only if the target design's data rate, bus loading, and timing margins are validated against the specific device's datasheet specifications. The MAX487EESA also has a lower quiescent current, which may be advantageous in power-sensitive applications.
What is the maximum data rate of each device?
The MAX487EESA supports data rates up to 250kbps. The MAX485ECSA supports data rates up to 2.5Mbps. These values are specified in the respective Analog Devices (Maxim Integrated) datasheets.
What are the ESD protection ratings for the MAX487EESA and MAX485ECSA?
Both the MAX487EESA and MAX485ECSA feature ±15kV ESD protection on the RS-485/RS-422 input/output pins (A and B) using the Human Body Model (HBM). This is specified in the Analog Devices (Maxim Integrated) datasheets for both devices.
What is the quiescent supply current of each device?
The MAX487EESA has a typical quiescent supply current of 120µA. The MAX485ECSA has a typical quiescent supply current of 300µA. Both values are specified in the respective Analog Devices (Maxim Integrated) datasheets.
What package options are available for the MAX487EESA and MAX485ECSA?
Both the MAX487EESA and MAX485ECSA are available in an 8-pin SOIC package (the "ESA" and "CSA" suffixes indicate the SOIC package and commercial temperature range). The MAX487EESA is also available in other package options, but the specific part number MAX487EESA refers to the 8-pin SOIC version. The MAX485ECSA is also available in an 8-pin PDIP package under a different suffix.
Do both devices operate from a single +5V supply?
Yes. Both the MAX487EESA and MAX485ECSA operate from a single +5V supply. This is specified in the Analog Devices (Maxim Integrated) datasheets for both devices.
What is the common-mode voltage range for these transceivers?
Both the MAX487EESA and MAX485ECSA have a common-mode voltage range of -7V to +12V, which is compliant with the RS-485 standard. This is specified in the Analog Devices (Maxim Integrated) datasheets for both devices.