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LTC2851HMS8#TRPBF

IC TXRX 8-MSOP

Part Number: LTC2851HMS8#TRPBF

Manufacturer: Analog Devices Inc.

Category: Drivers, Receivers, Transceivers

Package: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: LTC2851HMS8#TRPBF.pdf

Description: IC TXRX 8-MSOP

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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

LTC2851HMS8#TRPBF 3.3V, 20Mbps, Full-Duplex RS485/RS422 Transceiver

A comprehensive technical overview of the LTC2851HMS8#TRPBF, a low-power, full-duplex RS485/RS422 transceiver from Analog Devices featuring a 3.3V supply, 20Mbps maximum data rate, ±15kV ESD protection, 256-node support, fail-safe receiver operation, and an 8-lead MSOP package rated for operation from –40°C to +125°C (H-Grade). Covers device function, core features, electrical specifications, pin configuration, typical applications, and replacement selection guidance.

Analog Devices 8-Lead MSOP (3mm × 3mm) 3.3V Supply

Device Classification Full-Duplex RS485/RS422 Transceiver

Part Number: LTC2851HMS8#TRPBF

Mounting Type: Surface Mount

Operating Temperature Range: -40°C to +125°C (H-Grade)

PRODUCT OVERVIEW

What Is the LTC2851HMS8#TRPBF?

LTC2851HMS8#TRPBF is a low-power, full-duplex RS485/RS422 transceiver from Analog Devices (Linear Technology) that operates on a single 3.3V supply. The device is part of the LTC2850/LTC2851/LTC2852 family of rugged 3.3V transceivers, where the LTC2851 provides full-duplex operation without driver/receiver enable pins, simplifying system design for applications requiring continuous full-duplex communication.[reference:0]

The receiver features a one-eighth unit load, supporting up to 256 nodes per bus (C and I grades), and includes a fail-safe feature that guarantees a high output state when the receiver inputs are floating or shorted.[reference:1] The driver maintains a high output impedance over the entire common-mode range when disabled or unpowered, and current-limited outputs combined with thermal shutdown prevent excessive power dissipation from bus contention or faults.[reference:2]

Enhanced ESD protection allows the transceiver interface pins to withstand up to ±15kV (Human Body Model) without latch-up or damage.[reference:3] The LTC2851HMS8#TRPBF is the H-Grade version in an 8-lead MSOP package, fully specified for operation from –40°C to +125°C. The device is RoHS compliant, REACH unaffected, and in active production.

3.3V Full-Duplex RS485/RS422 Low-power transceiver with 20Mbps maximum data rate, full-duplex operation, and no driver/receiver enable pins for simplified design.

256-Node Support & Fail-Safe One-eighth unit load receiver supports up to 256 nodes per bus, with fail-safe output guaranteed high when inputs are open or shorted.

±15kV ESD & H-Grade Temperature Enhanced ESD protection up to ±15kV HBM on interface pins, with the H-Grade version specified over –40°C to +125°C for harsh environments.

DEVICE HIGHLIGHTS

Key Features and Benefits of LTC2851HMS8#TRPBF

3.3V Single Supply Operation

Operates from a single 3.3V supply (3V to 3.6V), reducing system power and simplifying power supply design compared to 5V RS485 transceivers.

20Mbps Maximum Data Rate

Supports high-speed RS485/RS422 communication up to 20Mbps for demanding industrial and instrumentation applications.

Full-Duplex Operation

The LTC2851 provides full-duplex communication (separate driver outputs Y/Z and receiver inputs A/B) without enable pins, enabling simultaneous transmit and receive.

±15kV ESD Protection

Enhanced ESD protection on transceiver interface pins up to ±15kV (Human Body Model) without latch-up or damage, ensuring robust field performance.

256-Node Support & Fail-Safe Receiver

One-eighth unit load allows up to 256 nodes per bus. Fail-safe receiver guarantees a high output state when inputs are open, shorted, or terminated without a valid signal.

Low Power & Thermal Shutdown

370µA typical supply current in receive mode, with current-limited drivers and thermal shutdown to prevent excessive power dissipation during bus contention.

REFERENCE DATA

Technical Specifications for LTC2851HMS8#TRPBF

Part Number	LTC2851HMS8#TRPBF	Manufacturer	Analog Devices
Device Type	Full-Duplex RS485/RS422 Transceiver	Family	LTC2850 / LTC2851 / LTC2852
Supply Voltage (V_CC)	3V to 3.6V	Maximum Data Rate	20 Mbps
Number of Drivers/Receivers	1/1	Duplex	Full
Node Support	256 Nodes (1/8 Unit Load)	ESD Protection (Interface Pins)	±15 kV (Human Body Model)
Supply Current (Receive Mode)	370 µA (Typical)	Shutdown Current	5 µA Max (C, I Grades)
Fail-Safe Receiver	Yes (Output High When Inputs Open/Shorted)	Driver Output Impedance	High Impedance When Disabled or Unpowered
Protection Features	Current-Limited Drivers, Thermal Shutdown	Standard Compliance	TIA/EIA-485-A
Package / Case	8-Lead MSOP (3mm × 3mm)	Package Height	0.86 mm
Pin Count	8	Mounting Type	Surface Mount
Operating Temperature (H-Grade)	-40°C to +125°C	Maximum Junction Temperature (T_JMAX)	150°C
Thermal Resistance (θ_JA, MSOP)	200°C/W	Thermal Resistance (θ_JC, MSOP)	40°C/W
RoHS	ROHS3 Compliant	REACH Status	REACH Unaffected
MSL Level	MSL 1 (Unlimited)	Product Status	Active
Packaging	Tape & Reel (2,500 per Reel)	Grade	H-Grade

Electrical values shown above are reference values. Test conditions, limits, and guaranteed performance should always be confirmed from the current official manufacturer datasheet before design or production use.

DESIGN REFERENCE

Circuit Considerations for LTC2851HMS8#TRPBF

Power Supply & Bus Termination

The LTC2851HMS8#TRPBF requires careful power supply and bus design:

Power Supply Bypass: Bypass V_CC to GND with a 0.1µF ceramic capacitor placed as close as possible to the device for stable operation.
Bus Termination: A 120Ω termination resistor should be placed at each end of the RS485 bus to minimize signal reflections and ensure reliable communication over long cable runs.
Fail-Safe Biasing: The device features a fail-safe receiver that guarantees a high output when inputs are open or shorted, eliminating the need for external fail-safe biasing resistors in most applications.[reference:5]
Full-Duplex Wiring: For full-duplex operation, connect the driver outputs (Y, Z) to the bus and the receiver inputs (A, B) to the bus. Ensure proper pairing and termination for both transmit and receive pairs.
Unused Pins: For the LTC2851 full-duplex version, there are no enable pins. If the driver or receiver is not used, the respective inputs should be tied to a defined logic level.

PCB and System-Level Guidance

Transceiver performance depends on layout and component selection:

Differential Pair Routing: Route the A/B and Y/Z differential pairs as tightly coupled, matched-length traces to maintain signal integrity at 20Mbps data rates.
ESD Protection: The device includes ±15kV ESD protection on interface pins. For additional protection in harsh environments, external TVS diodes can be added on the bus lines.
Thermal Management: The MSOP package has a thermal resistance (θ_JA) of 200°C/W. Ensure adequate PCB copper area for heat dissipation, especially in high-temperature or high-load conditions.
Ground Plane: Use a low-impedance ground plane and connect the GND pin with short, wide traces to minimize parasitic inductance.
Verify the recommended PCB footprint from the official datasheet prior to production.

8-LEAD MSOP (3mm × 3mm)

Pin Configuration Reference for LTC2851HMS8#TRPBF

LTC2851

MSOP TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The MSOP package has 8 pins with a 3mm × 3mm body size and 0.86mm height. The pin configuration follows the industry-standard 8-pin full-duplex transceiver pinout.

1 V_CC Positive Supply - 3V to 3.6V; Bypass with 0.1µF Ceramic Capacitor to GND

2 RO Receiver Output - High if A > B by 200mV, Low if A < B by 200mV; High When Inputs Open/Shorted (Fail-Safe)

3 DI Driver Input - Low Forces Y Low and Z High; High Forces Y High and Z Low

4 GND Ground

5 Y Noninverting Driver Output - High Impedance When Driver Disabled or Unpowered

6 Z Inverting Driver Output - High Impedance When Driver Disabled or Unpowered

7 B Inverting Receiver Input - Impedance >96kΩ in Receive Mode or Unpowered

8 A Noninverting Receiver Input - Impedance >96kΩ in Receive Mode or Unpowered

APPLICATION AREAS

Typical Applications for LTC2851HMS8#TRPBF

Low Power RS485/RS422 Networks

3.3V operation and 370µA typical supply current make this transceiver ideal for low-power industrial RS485/RS422 bus networks.

Level Translators

Full-duplex operation and wide common-mode range suit level translation between different RS485/RS422 bus segments or systems.

Backplane Transceivers

20Mbps data rate and 256-node support enable reliable backplane communication in industrial and telecom equipment.

Automotive & Harsh Environments

H-Grade –40°C to +125°C operation and ±15kV ESD protection suit automotive and harsh industrial environments.

Industrial Automation

Robust fault protection (thermal shutdown, current limiting) and fail-safe receiver ensure reliable operation in factory automation systems.

Telecom & Networking Equipment

Full-duplex RS485/RS422 communication supports telecom and networking equipment requiring simultaneous bidirectional data transfer.

REPLACEMENT GUIDANCE

Selecting an Alternative for LTC2851HMS8#TRPBF

A replacement for the LTC2851HMS8#TRPBF should not be selected solely by product category. The electrical characteristics, package, and pin configuration must be evaluated against the specific circuit requirements. The following alternatives are documented in the official Analog Devices product pages and datasheets.

Type: Full-Duplex RS485/RS422 Transceiver

Supply voltage: 3V–3.6V

Data rate: 20 Mbps

Duplex: Full

Node support: 256

ESD protection: ±15kV

Package: 8-Lead MSOP

Temperature range: –40°C to 125°C (H-Grade)

Pin-to-pin and functionally compatible alternatives (same family, different grade or packaging):

Part Number	Package	Temperature Grade	Packaging
LTC2851HMS8#TRPBF	8-Lead MSOP	H-Grade (-40°C to 125°C)	Tape & Reel
LTC2851HMS8#PBF	8-Lead MSOP	H-Grade (-40°C to 125°C)	Tube
LTC2851IMS8#TRPBF	8-Lead MSOP	I-Grade (-40°C to 85°C)	Tape & Reel
LTC2851CMS8#TRPBF	8-Lead MSOP	C-Grade (0°C to 70°C)	Tape & Reel
LTC2851HDD#TRPBF	8-Lead DFN (3mm × 3mm)	H-Grade (-40°C to 125°C)	Tape & Reel
LTC2851HS8#TRPBF	8-Lead SOIC	H-Grade (-40°C to 125°C)	Tape & Reel

All alternative part numbers listed above are documented in the official Analog Devices product pages and datasheets. The LTC2851HMS8#TRPBF is the H-Grade (–40°C to +125°C) full-duplex version in an 8-lead MSOP package with tape-and-reel packaging (2,500 units per reel). For tube packaging in the same grade, consider LTC2851HMS8#PBF. For I-Grade (–40°C to +85°C) operation, consider LTC2851IMS8#TRPBF. For C-Grade (0°C to +70°C) operation, consider LTC2851CMS8#TRPBF. For the DFN package option, consider LTC2851HDD#TRPBF. For the SOIC package option, consider LTC2851HS8#TRPBF. Select based on temperature grade, package, and packaging requirements.[reference:6]

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MANUFACTURER INFORMATION

Analog Devices

The LTC2851 (LTC2851HMS8#TRPBF) belongs to the LTC2850/LTC2851/LTC2852 family of low-power, 20Mbps RS485/RS422 transceivers from Analog Devices (originally Linear Technology). The LTC2851 provides full-duplex operation, while the LTC2850 is half-duplex with enable pins. The devices operate on a 3.3V supply, feature a one-eighth unit load receiver supporting up to 256 nodes, and include fail-safe receiver operation, current-limited drivers, thermal shutdown, and ±15kV ESD protection on the interface pins. The family is available in 8-pin and 10-pin DFN, MSOP, and SO packages, with the H-Grade versions specified over –40°C to +125°C for automotive and harsh industrial applications.

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Technical Information Disclaimer

This technical guide is provided for product identification and preliminary reference only. Electrical limits, package dimensions, pin configuration, product status, and application suitability must be verified using current official manufacturer documentation before design, procurement, or production.

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Specifications

Product Attribute: Attribute Value

Part Number: LTC2851HMS8#TRPBF

Manufacturer: Analog Devices Inc.

Package: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Series: -

Package/Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging: Tape & Reel (TR)

Product Status: Active

Type: Transceiver

Protocol: RS422, RS485

Number of Drivers/Receivers: 1/1

Duplex: Full

Receiver Hysteresis: 25 mV

Data Rate: 20Mbps

Voltage - Supply: 3V ~ 3.6V

Operating Temperature: -40°C ~ 125°C

Grade: -

Qualification: -

Mounting Type: Surface Mount

Supplier Device Package: 8-MSOP

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LTC2851HMS8#TRPBF Procurement and Technical Support

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Part Number: LTC2851HMS8#TRPBF

Manufacturer: Analog Devices Inc.

Package: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Category: Drivers, Receivers, Transceivers

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