ISL81334IBZ Equivalent & Substitute Parts

Part Overview

The ISL81334IBZ is a 2/2 full-duplex RS232, RS422, and RS485 transceiver manufactured by Renesas Electronics Corporation in a 28-SOIC surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The ISL81334IBZ operates across a 4.5V to 5.5V supply range with a 20 Mbps data rate and is suitable for industrial communication applications requiring multi-protocol transceiver functionality.

Substiute Parts

ISL81334IBZ

Renesas Electronics CorporationIn Stock: 1726ISL81334IBZ Datasheet

Current PartRFQ

LTC1334CSW#PBF

Analog Devices Inc.In Stock: 1969LTC1334CSW#PBF Datasheet

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LTC1334CSW#TRPBF

Analog Devices Inc.In Stock: 3292LTC1334CSW#TRPBF Datasheet

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LTC1334ISW#PBF

Analog Devices Inc.In Stock: 3504LTC1334ISW#PBF Datasheet

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LTC1334ISW#TRPBF

Analog Devices Inc.In Stock: 2313LTC1334ISW#TRPBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ISL81334IBZ is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 28-SOIC (0.295", 7.50mm Width) surface mount package to ensure PCB layout compatibility without redesign.

Protocol Support: The ISL81334IBZ supports RS232, RS422, and RS485 protocols. Substitute parts must support at least RS232 and RS485 to maintain functional compatibility in typical applications.

Duplex Mode: Full-duplex operation is required for equivalent substitution.

Supply Voltage Range: The ISL81334IBZ operates at 4.5V to 5.5V. Substitute parts with overlapping or wider supply voltage ranges are acceptable.

Operating Temperature Range: The ISL81334IBZ operates from -40°C to 85°C. Substitute parts meeting or exceeding this range are suitable for equivalent replacement.

Driver/Receiver Configuration: The 2/2 configuration (2 drivers, 2 receivers) is the baseline requirement. Parts with higher driver/receiver counts (such as 3/3) are functionally compatible as they provide additional channels.

The LTC1334 series from Analog Devices Inc. meets these substitution criteria across all packaging variants.

Parameter Comparison

Engineering Selection Recommendations

For Extended Temperature Range Applications (-40°C to 85°C):

Use LTC1334ISW#PBF or LTC1334ISW#TRPBF. Both variants maintain the full -40°C to 85°C operating temperature range of the original ISL81334IBZ. The choice between these two depends on packaging requirements: LTC1334ISW#PBF is supplied in Tube packaging, while LTC1334ISW#TRPBF is supplied in Tape & Reel format for automated assembly.

For Standard Temperature Range Applications (0°C to 70°C):

LTC1334CSW#PBF or LTC1334CSW#TRPBF are suitable alternatives. These parts operate within the 0°C to 70°C range and are appropriate for commercial and industrial environments not requiring extended low-temperature operation. LTC1334CSW#PBF uses Tube packaging; LTC1334CSW#TRPBF uses Cut Tape & Digi-Reel packaging.

Compliance and Reliability:

All LTC1334 variants are active products from Analog Devices Inc. with ROHS3 compliance and improved moisture sensitivity levels (MSL 1 vs. MSL 3), providing superior handling and storage characteristics compared to the obsolete ISL81334IBZ.

Supply Voltage Consideration:

The LTC1334 series operates at 4.75V to 5.25V, which is narrower than the ISL81334IBZ range of 4.5V to 5.5V. Verify that your power supply design maintains voltage within the LTC1334 specification to ensure reliable operation.

Frequently Asked Questions (FAQ)

Q: Can the LTC1334 series directly replace the ISL81334IBZ without PCB modifications?

A: Yes, all LTC1334 variants use the same 28-SOIC package footprint as the ISL81334IBZ. No PCB layout changes are required for mechanical and electrical pin compatibility.

Q: What is the difference between the LTC1334CSW and LTC1334ISW variants?

A: The primary difference is the operating temperature range. The "C" suffix (LTC1334CSW) specifies 0°C to 70°C operation, while the "I" suffix (LTC1334ISW) specifies -40°C to 85°C operation. Select based on your application's temperature requirements.

Q: Does packaging format affect electrical performance?

A: No. The #PBF, #TRPBF, and Cut Tape variants of the same base part number (e.g., LTC1334ISW) have identical electrical specifications. Packaging format affects only supply chain logistics and assembly automation compatibility. Choose based on your manufacturing process requirements.

Q: Why do the LTC1334 parts have 3/3 driver/receiver configuration instead of 2/2?

A: The LTC1334 provides additional channels beyond the ISL81334IBZ requirement. This higher channel count is functionally compatible and allows for expanded communication capability without changing the core transceiver functionality needed for 2/2 applications.

Q: Is the higher receiver hysteresis (70 mV vs. 35 mV) on the LTC1334 a concern?

A: The increased hysteresis on the LTC1334 provides improved noise immunity in industrial environments. This is generally beneficial for RS485 and RS422 applications. Verify compatibility with your specific signal levels and noise environment if operating near threshold conditions.

Q: What is the impact of the narrower supply voltage range on the LTC1334?

A: The LTC1334 operates at 4.75V to 5.25V versus the ISL81334IBZ at 4.5V to 5.5V. Ensure your power supply design maintains voltage within the LTC1334 specification. Most standard 5V regulated supplies operate within this range without issue.

Q: Are all LTC1334 variants ROHS3 compliant?

A: Yes, all LTC1334 variants listed are ROHS3 compliant. The LTC1334 series also features improved moisture sensitivity (MSL 1 vs. MSL 3), reducing handling and storage risks during manufacturing.