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Texas Instruments MAX3222IDWG4 — Interface & Transceivers

MAX3222IDWG4 RS-232 Transceiver, 250 kbps, 20-SOIC

MPNMAX3222IDWG4
End of Life

Texas Instruments MAX3222IDWG4 RS-232 transceiver, full duplex, 250 kbps data rate, 3V-5.5V supply, 2/2 drivers/receivers, 300 mV receiver hysteresis, -40°C to 85°C, 20-SOIC surface-mount package, active lifecycle.

Texas Instruments MAX3222IDWG4 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MAX3222IDWG4 specifications
ParameterValue
TypeTransceiver
MountingSurface Mount
Supply voltage3V ~ 5.5V
ProtocolRS232
Operating temperature-40°C~85°C
DuplexFull
PackageTube
Data rate250kbps
Case20-SOIC (0.295\", 7.50mm Width)
Receiver hysteresis300 mV
Number of drivers (Receivers)2/2

Product details

250 kbps data rate — what it buys on the bus

At 250 kbps this transceiver comfortably handles 115200 baud with a 2x oversampling margin, but it will not sustain the 1 Mbps rates some newer RS-232 parts claim. If your design needs 460800 baud or higher, look at the MAX3223 family with 1 Mbps capability. For the vast majority of legacy serial ports, bar-code scanners, and PLC programming cables, 250 kbps is the right tier — no overpaying for speed you cannot use.

Dropout at the low end is not an issue — the charge pump generates the RS-232 ±5 V swing from a 3 V rail internally. Just ensure the supply bypass cap is 0.1 µF close to the VCC pin per the reference layout.

There is no last-time-buy notice in effect, and no successor part number has been issued. This part can be qualified into a production BOM without a near-term end-of-life contingency plan.

Frequently asked questions

Is MAX3222IDWG4 obsolete?

No. There is no end-of-life notification from Texas Instruments, and no successor part has been designated.

What is the data rate of MAX3222IDWG4?

The MAX3222IDWG4 signals at 250 kbps, which covers standard UART rates up to 115200 baud with margin. It does not support 1 Mbps rates.

What is the difference between MAX3222IDWG4 and MAX3222CDBR?

The MAX3222CDBR is the tape-and-reel packaged variant of the same RS-232 transceiver die. The IDWG4 suffix indicates the tube-packaged 20-SOIC version. The choice is a logistics decision: tube for prototype or low-volume builds, tape-and-reel for automated pick-and-place production.

Is MAX3222IDWG4 compatible with 5V logic?

Yes. Receiver inputs tolerate 5 V logic levels when the part is powered from 3.3 V.

What is the typical application of MAX3222IDWG4?

This transceiver is used for RS-232 serial communication in industrial control panels, point-of-sale terminals, telecom base-station management ports, and PLC programming interfaces — anywhere a UART needs to be extended over a few metres of cable with ±5 V signalling.