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STMicroelectronics ST75185CTR — Sensors & Transducers

ST75185CTR RS232 Transceiver 3/5 20-TSSOP –

MPNST75185CTR
End of Life

STMicroelectronics ST75185CTR, RS232 transceiver, full duplex, 3 drivers / 5 receivers, 120 Kbps data rate, 4.5V–5.5V supply, 0°C–70°C, 20-TSSOP package.

$1.54Ref. price · indicative, final on quote
STMicroelectronics ST75185CTR datasheet (PDF)
Packaging20-TSSOP (0.173", 4.40mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

ST75185CTR specifications
ParameterValue
TypeTransceiver
MountingSurface Mount
Voltage4.5V ~ 5.5V
ProtocolRS232
Operating temperature0°C ~ 70°C
DuplexFull
PackageTape & Reel (TR); Cut Tape (CT)
Data rate120Kbps
Case20-TSSOP (0.173\", 4.40mm Width)
Receiver hysteresis500 mV
Number of drivers (Receivers)3/5

Product details

RS232 transceiver with 3/5 channel count

The ST75185CTR is a full-duplex RS232 transceiver from STMicroelectronics, integrating three drivers and five receivers in a single 20-TSSOP package. Data rate is rated at 120 Kbps — enough for standard 115200 baud and below, but not for high-speed RS232 applications above that ceiling.

Supply and temperature envelope

For industrial or automotive environments, look for a wider-temperature sibling.

Package and hand-solderability

The supplier device package is 20-TSSOP; the footprint matches standard TSSOP-20 land patterns. No exposed pad, so thermal management is through the PCB copper alone.

Frequently asked questions

Is ST75185CTR a direct replacement for ST75185C?

The ST75185CTR is the tape-and-reel variant of the base ST75185C. The die and electrical specs (3/5 drivers/receivers, 120 Kbps, 4.5-5.5V, 0-70°C) are identical. The only difference is the packaging format — CT suffix indicates Cut Tape or Tape & Reel. Pinout is the same; it is a drop-in replacement for the ST75185C in surface-mount designs.

Can ST75185CTR replace MAX232?

Both are RS232 transceivers, but the ST75185CTR has three drivers and five receivers versus the MAX232's two drivers and two receivers. The ST75185CTR also runs on a 4.5V–5.5V supply and operates at 120 Kbps, while the MAX232 typically supports up to 120 Kbps as well. The pinout differs — the ST75185CTR is a 20-TSSOP, not a 16-pin DIP/SOIC. It is not a direct pin-compatible replacement; a board redesign is required.

What is the data rate of ST75185CTR?

The ST75185CTR is rated for 120 Kbps. This supports standard baud rates up to 115200 without issue, but it will not handle higher-speed RS232 protocols above that ceiling.

Is ST75185CTR 5V tolerant?

Yes — the supply voltage range is 4.5V to 5.5V, and the RS232 IO levels are generated internally from that rail. The logic-side pins are 5V logic; they are not 3.3V tolerant without a level shifter.