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MAX485 Alternatives – Pin-Compatible and Modern RS-485 Transceivers In Stock
MAX485 is still in active production and widely stocked. If any of the following sounds familiar — your next board revision needs to run from a 3.3V supply instead of 5V, you want to eliminate the DE/RE pin toggling in firmware, your application needs built-in surge or ESD protection without external TVS diodes, or you are moving to an isolated RS-485 design — then the alternatives below are worth a look. MAX3485, THVD1439, MAX13487E, SP485, and ISO1500 each solve a different version of that need. Some are pin-compatible with no layout change required. Some need a new footprint but deliver better protection or integration meaningfully. The table below shows exactly where each one fits. We stock all of them, including the original MAX485.
Direct/Similar Pin-Compatible Alternatives
MAX485 uses a standard 8-pin DIP or SOIC package. Several parts share this exact footprint and can be swapped with minimal or no changes
| Part | Manufacturer | Supply Voltage | Max Data Rate | ESD Protection | Bus Fault Protection | Pin Compatible | Stock |
| MAX3485 | Analog Devices | 3.3V | 10Mbps | +-15kV HBM | +-7V to +12V | Yes | In Stock |
| SP485 | MaxLinear | 5V | 10Mbps | +-15kV HBM | +-15V | Yes | In Stock |
| THVD1439 | Texas Instruments | 3V to 5.5V | 250kbps / 12Mbps | +-15kV HBM | +-15V DC | Yes (8-pin SOIC) | In Stock |
MAX3485 is the most direct alternative for designs migrating from 5V to 3.3V logic. Same 8-pin package, same pinout, same DE/RE control logic. Runs at 3.3V supply, interoperable with 5V logic, and supports data rates up to 10Mbps. Drop it in, change the supply rail, and you are done.
SP485 stays at a 5V supply and matches the MAX485 pinout exactly, but raises bus fault tolerance from MAX485’s standard level to +-15V on the bus lines. If your installation environment has voltage spikes or transients on the RS-485 bus — motor drives, relay-switching environments, long cable runs — SP485 gives you more headroom without changing your layout or firmware.
THVD1439 works from a 3V to 5.5V supply, fits the same 8-pin SOIC footprint, and adds integrated 4kV surge protection and +-15kV ESD — no external TVS diodes needed. Available in 250kbps and 12Mbps speed grades. If you are currently adding external protection components around your MAX485 to meet industrial EMC requirements, THVD1439 removes all of them from your BOM.
Full Alternatives Comparison Table
| Part | Manufacturer | Supply | Max Data Rate | ESD | Bus Fault | Auto Direction | Isolation | Pin Compatible | Recommended Level | Stock |
| MAX485 | Analog Devices | 5V | 2.5Mbps | +-2.5kV | +-7V to +12V | No | No | Original | Reference | In Stock |
| MAX3485 | Analog Devices | 3.3V | 10Mbps | +-15kV HBM | +-7V to +12V | No | No | Yes | Highly Recommended | In Stock |
| SP485 | MaxLinear | 5V | 10Mbps | +-15kV HBM | +-15V | No | No | Yes | Highly Recommended | In Stock |
| THVD1439 | Texas Instruments | 3V – 5.5V | 250kbps / 12Mbps | +-15kV HBM | +-15V DC | No | No | Yes (8-pin SOIC) | Highly Recommended | In Stock |
| MAX13487E | Analog Devices | 5V | 500kbps | +-15kV HBM | +-15V | Yes (AutoDirection) | No | No (layout change) | Recommended | In Stock |
| ISO1500 | Texas Instruments | 3V – 5.5V | 50kbps | +-15kV HBM | +-15V | No | 5kV | No (layout change) | Recommended | In Stock |
Each Alternative Details
MAX3485 – Analog Devices
The standard path when your MCU has moved to 3.3V. Same 8-pin package, same pinout as MAX485, same DE/RE control logic. Runs from a single 3.3V supply and is interoperable with 5V logic levels, so mixed-voltage boards are not a problem. Data rate goes up to 10Mbps. No firmware changes needed. No layout changes needed. The only adjustment is the supply rail.
Pin compatible: Yes. Layout change: No. Firmware change: No. Supply change: 5V to 3.3V.
SP485 – MaxLinear
Same 5V supply, same pinout, same 10Mbps data rate as MAX485. The key difference is bus fault tolerance — SP485 is rated to +-15V on the bus lines versus MAX485’s standard level. In industrial environments where the RS-485 bus shares cable runs with motor control wiring or other noisy equipment, this extra headroom significantly reduces the risk of transceiver damage from voltage transients. A direct drop-in if you need more robustness without changing any other part of your design.
Pin compatible: Yes. Layout change: No. Firmware change: No.
THVD1439 – Texas Instruments
Works from 3V to 5.5V supply on the same 8-pin SOIC footprint. Built-in 4kV IEC 61000-4-4 surge protection and +-15kV HBM ESD means you can remove external TVS diodes from your BOM entirely. Supports up to 256 bus nodes (1/8 unit load). Available in two speed grades: THVD1439 at 250kbps and THVD1449 at 12Mbps. Open, short, and idle bus failsafe built in. If you are designing for industrial automation or factory environments and currently using discrete protection components around your MAX485, THVD1439 consolidates all of that into one part.
Pin compatible: Yes. Layout change: No. Firmware change: No..
MAX13487E – Analog Devices
The reason engineers choose MAX13487E over MAX485 is AutoDirection control — an internal state machine that automatically enables the driver when transmitting and switches to receive mode when the UART is idle. No DE/RE pin toggling in firmware. If your current RS-485 firmware has a wrapper function to manually manage the direction pins, that entire section can be removed. Operates at 5V, same 8-pin SOIC package size but different pinout from MAX485 — a layout change is required. Slew-rate-limited to 500kbps to minimize EMI on long cable runs.
Pin compatible: No. Layout change: Yes. Firmware change: Yes (remove DE/RE direction control code).
ISO1500 – Texas Instruments
A fully isolated RS-485 transceiver with 5kV isolation in a single package, running from 3V to 5.5V supply. Traditionally, isolated RS-485 designs require a transceiver plus a digital isolator plus an isolated DC-DC converter — three separate components. ISO1500 integrates the digital isolation directly, cutting the component count significantly. Data rate up to 50Mbps. Not pin-compatible with MAX485 — requires a new PCB layout and an isolated power supply for the bus side. The right choice for medical equipment, industrial motor drives, or any application where ground loop isolation is a hard requirement.
Pin compatible: No. Layout change: Yes. Firmware change: No (DE/RE pins still present).o.
Selection Guide
If your MCU runs on 3.3V and you need a direct pin-compatible swap:
Recommend MAX3485 – same pinout as MAX485, 3.3V supply, 10Mbps, no layout or firmware changes
If you need more bus fault tolerance in a noisy industrial environment with no layout change:
Recommend SP485 – same 5V pinout as MAX485, +-15V bus fault rating, direct drop-in
If you want integrated surge and ESD protection to simplify your BOM:
Recommend THVD1439 – built-in 4kV surge and +-15kV ESD, works from 3V to 5.5V, same 8-pin SOIC footprint
If you want to eliminate DE/RE direction control in firmware:
Recommend MAX13487E – AutoDirection control handles driver enable automatically, remove direction toggle code entirely
If your application requires galvanic isolation between the controller and the RS-485 bus:
Recommend ISO1500 – 5kV isolation integrated, single package replaces transceiver plus isolator plus DC-DC
If you need the original MAX485:
We stock it and can quote it alongside any of the above
Risk Notes
Supply voltage (MAX3485): MAX3485 runs on 3.3V. If your board supplies 5V to the MAX485 today, either reroute the supply rail to 3.3V or add a local LDO before swapping. Running MAX3485 on 5V will damage the device.
Pinout change (MAX13487E): MAX13487E is not pin-compatible with MAX485. Pin 1 and pin 4 functions differ. Do not attempt to drop it into a MAX485 footprint. A board layout change is required.
Firmware change (MAX13487E): AutoDirection removes the need for DE/RE control, but your firmware direction-control code must be removed or disabled. Leaving conflicting direction control in firmware can cause bus contention.
Isolated power supply (ISO1500): ISO1500 requires a separate isolated power supply for the bus-side VCC2. If your board does not already have an isolated supply, this adds a component. Factor the isolated DC-DC into your BOM and layout before committing to ISO1500.
Bus termination: MAX485 and all alternatives on this page require a 120-ohm termination resistor at each end of the RS-485 bus for data rates above a few hundred kbps. This is not a component change — it is a network-level requirement that applies regardless of which transceiver you use.
Counterfeit MAX485: A large number of low-cost MAX485 parts available through grey-market channels are not genuine Analog Devices parts and do not meet the datasheet specifications for ESD, bus fault voltage, or data rate. We supply genuine Analog Devices-sourced MAX485.
Need a pin-compatible or better-protected alternative to MAX485?
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In stock in SOIC-8 and DIP-8 – MAX485, MAX3485, SP485, THVD1439, MAX13487E, and ISO1500 all available. Tell us your quantity and we will respond with pricing the same day.
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