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Analog Devices LT1781IS#PBF — Memory (DRAM / SRAM / Flash / EEPROM)
Analog Devices

LT1781IS#PBF RS-232 Transceiver, Full Duplex, 250 kBd

MPNLT1781IS#PBF
End of Life

Analog Devices LT1781IS#PBF, RS-232 Transceiver, Full Duplex, 2/2 Drivers/Receivers, 250 kBd, 4.5V-5.5V Supply, 400 mV Hysteresis, -40°C to 85°C, 16-SOIC, Tube.

$10.84Ref. price · indicative, final on quote
LT1781IS#PBF datasheet
Packaging16-SOIC (0.154", 3.90mm Width)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

LT1781IS#PBF Technical Specifications
ParameterValue
TypeTransceiver
Mounting typeSurface Mount
Voltage4.5V ~ 5.5V
ProtocolRS232
Operating temperature-40°C ~ 85°C
DuplexFull
PackageTube
Data rate250KBd
Case16-SOIC (0.154\", 3.90mm Width)
Receiver hysteresis400 mV
Number of drivers (Receivers)2/2

Product details

RS-232 link for 5 V-only designs

The LT1781IS#PBF is a full-duplex RS-232 transceiver with two drivers and two receivers. It operates on a 4.5 V to 5.5 V supply and supports a 250 kBd data rate with 400 mV receiver hysteresis.

250 kBd and 400 mV hysteresis — what they mean on the wire

At 250 kBd the part handles the full RS-232 data rate. The 400 mV hysteresis prevents chatter on long cables without external buffers.

Active lifecycle — no LTB clock ticking

The LT1781IS#PBF carries an Active product status and is ROHS3 compliant. There is no last-time-buy window to track, no NRND flag, and no forced redesign horizon. For a BOM freeze or a long-production run, this part can be specified without scheduling an obsolescence review for the foreseeable future.

Frequently asked questions

What is an equivalent part to LT1781IS#PBF?

The ADM1181AARWZ is a close functional second-source: full-duplex RS-232 transceiver, 2/2 drivers/receivers, 230 kbps data rate, 650 mV hysteresis, same 4.5 V supply and temperature range. The LT1781IS#PBF offers a slightly higher data rate (250 kBd) while the ADM1181AARWZ provides more receiver hysteresis for noisy environments.

Can LT1781IS#PBF replace MAX232?

Yes, the LT1781IS#PBF is a functional replacement for a MAX232 in 5 V-only designs. Both are full-duplex RS-232 transceivers with 2/2 drivers/receivers in similar SOIC packages. The LT1781IS#PBF has 400 mV hysteresis versus the MAX232's typical 300 mV, giving better noise immunity on longer cable runs.

What is the data rate of LT1781IS#PBF?

The data rate is 250 kBd.