MAX3430 ±80V Fault-Protected, Fail-Safe, 1/4-Unit Load, +3.3V RS-485 Transceiver

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The MAX3430 fault-protected RS-485 transceiver features ±80V protection from overvoltage signal faults on communication bus lines. Each device contains one driver and one receiver, and the output pins can withstand faults, with respect to ground, of up to ±80V. Even if the faults occur when the transceiver is active, shut down, or powered off, the device will not be damaged. The MAX3430 operates from a 3.3V supply and features a slew-rate-limited driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The MAX3430 has a 1/4-unit-load receiver input impedance allowing up to 128 transceivers on a single bus and features fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open.

Hot-swap circuitry eliminates false transitions on the data cable during circuit initialization or connection to a live backplane. Short-circuit current limiting and thermal- shutdown circuitry protect the driver against excessive power dissipation.

The MAX3430 is available in 8-pin SO and 8-pin PDIP packages, and is specified over commercial and industrial temperature ranges.

Key Features

Applications/Uses

±80V Fault Protection
±12kV ESD Protection
+3.3V Operation
Internal Slew-Rate Limiting
250kbps Data Rate
Allows Up to 128 Transceivers on the Bus
-7V to +12V Common-Mode Input Voltage Range
True Fail-Safe Inputs
Hot-Swap Input Structure on DE
Available in 8-Pin SO and PDIP Packages

	Industrial Control Local Area Networks
	Lighting Systems
	Multimaster RS-485 Networks
	Profibus Applications
	RS-422/RS-485 Communications

Key Specifications: RS-422/485 Line Driver/Receivers

Part Number

Number of Tx/Rx

Duplex

Supply Voltage (V)

Fault Protection (±V)

Typ. I_CC (mA)

Data Rate (kbps)

Tx EN

Rx EN

Typ. Shutdown I_CC (µA)

Number of Rx/Tx on Bus

Rx Failsafe with Inputs:

Features

Slew Rate Limited

RoHS Available

Industry Qualified

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX3430

1Tx + 1Rx

Half

3.3

3.5

250

Yes

100

128

Open or Shorted

•	Hot-Swap Support

•	Low Power Shutdown

Yes

Automotive - General

PDIP/8
SOIC/8

-40 to +85
0 to +70

$2.25 @ 1k

See All RS-422/485 Line Driver/Receivers (150)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.