LTC2872CUHF#PBF Linear Technology Integrated Circuit (Quad Flat No-Lead) In Stock
Linear Technology LTC2872CUHF#PBF is a dual RS-232/RS-485 multiprotocol transceiver in a 38-pin QFN package supporting both EIA-232 and EIA-422/485 standards with Schmitt trigger inputs and 4-driver architecture. It enables seamless protocol switching between RS-232 and RS-485 differential signaling in a single IC. Available with worldwide distribution for industrial and communications applications.
- Manufacturer
- Linear Technology
- Package
- Quad Flat No-Lead
- Pin Count
- 38
- Lifecycle
- ACTIVE
- Datasheet
- LTC2872CUHF#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $8.8100(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual-protocol RS-232 and RS-485/422 transceiver in one 38-QFN IC eliminating separate protocol chips in multi-interface designs
- Schmitt trigger inputs on all receiver paths providing noise immunity and hysteresis for clean digital output on noisy industrial RS-485 buses
- 4-driver RS-232 output stage or 2-pair RS-485 differential operation selectable to match system interface requirements
- Compact 38-pin QFN package (PQCC-N38) enabling high-density PCB layouts for multi-port serial interface boards
Applications
LTC2872CUHF#PBF is used in industrial serial communication hubs, programmable logic controllers, and embedded gateways that must bridge RS-232 legacy equipment with RS-485 multi-drop networks on a single board. It simplifies firmware-configurable serial port designs in telecom line cards and data acquisition systems requiring both point-to-point RS-232 and multi-drop RS-485 links. The multiprotocol capability reduces BOM count in designs that previously required separate RS-232 and RS-485 transceiver ICs.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1701 |
| YTEOL | 10 |
| Additional Feature | ALSO OPERATES AS TWO RS485 DIFFERENTIAL TRANSCEIVER PAIR |
| Differential Output | NO |
| Driver Number of Bits | 4 |
| Input Characteristics | SCHMITT TRIGGER |
| Interface IC Type | LINE TRANSCEIVER |
| Interface Standard | EIA-232; EIA-422 |
| JESD-30 Code | R-PQCC-N38 |
| JESD-609 Code | e3 |
| Number of Functions | 4 |
| Out Swing-Min | 10V |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC38,.2X.28,20 |
| Package Shape | RECTANGULAR |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Receive Delay-Max | 200ns |
| Receiver Number of Bits | 4 |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 1.7V |
| Supply Voltage-Nom | 3.3V |
| Supply Voltage1-Max | 5.5V |
| Supply Voltage1-Min | 3V |
| Supply Voltage1-Nom | 3.3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Transmit Delay-Max | 2000ns |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does LTC2872CUHF#PBF support both RS-232 and RS-485 signaling in a single IC?
LTC2872CUHF#PBF integrates dual RS-232 drivers and receivers alongside an RS-485 differential transceiver pair in a 38-pin QFN package. The IC can operate as 4-channel RS-232 (EIA-232) or switch to two RS-485 differential pairs (EIA-422/485), allowing firmware control of the active protocol. This eliminates the need for separate RS-232 and RS-485 chips, reducing BOM cost and PCB area on multi-protocol serial interface boards.
What is the significance of Schmitt trigger inputs on LTC2872CUHF#PBF for noisy industrial RS-485 bus environments?
Schmitt trigger inputs on LTC2872CUHF#PBF provide input hysteresis, typically 200mV to 500mV, that prevents output chatter when the RS-485 differential voltage slowly crosses the threshold due to cable reflections or common-mode noise. In industrial environments with 50-meter RS-485 cables running near motor drives, the Schmitt trigger characteristic ensures a clean single-edge output transition even when the input signal has 100mV to 300mV of superimposed noise ripple.
For a multi-drop RS-485 network, how many drivers can LTC2872CUHF#PBF enable simultaneously?
In RS-485 mode, LTC2872CUHF#PBF provides 2 differential transmitter pairs and 2 differential receiver pairs, with only 1 driver enabled at a time on a half-duplex RS-485 bus to comply with the EIA-485 requirement that only one driver is active per bus segment. In full-duplex RS-422 mode, both pairs can operate simultaneously, supporting data rates up to several Mbps over twisted-pair cable of up to 100 meters.
What package does LTC2872CUHF#PBF use and what PCB layout considerations does the 38-QFN require?
LTC2872CUHF#PBF is housed in a 38-pin QFN (PQCC-N38) package with an exposed thermal pad on the bottom. QFN layout requires a matching 38-pad land pattern with 0.5mm pin pitch on the PCB, plus a central thermal relief pad connected to ground. No-lead packages require controlled reflow with adequate paste coverage on the thermal pad, typically split by a solder mask dam into 4 to 9 sub-apertures to prevent solder balling during reflow.
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About Linear Technology
Linear Technology is a leading electronic component manufacturer. FindMyChip sources Linear Technology ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
More from Linear Technology
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $17.4300 | $17.43 |
| 10+ | $12.2610 | $122.61 |
| 19+ | $11.6800 | $221.92 |
| 1000+ | $8.8100 | $8810.00 |
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