THVD1406DR RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The THVD1406DR is an active RS422/RS485 half-duplex transceiver manufactured by Texas Instruments, designed for industrial communication applications requiring robust signal transmission over twisted-pair cabling. This 8-SOIC surface-mount device operates across a 3V to 5.5V supply range and supports data rates up to 500 kbps. The product maintains Active status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1), making it suitable for long-term deployment in standard manufacturing and control environments. Equivalent substitute parts are identified based on matching electrical specifications, mechanical packaging, and functional protocol support to ensure direct interchangeability in circuit designs.

Substiute Parts

THVD1406DR

Texas InstrumentsIn Stock: 8841THVD1406DR Datasheet

Current PartRFQ

THVD1400DR

Texas InstrumentsIn Stock: 5000501THVD1400DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the THVD1406DR is determined by strict equivalence across the following critical parameters:

Protocol Compatibility: Both the main part and substitute must support identical RS422/RS485 communication protocols to ensure signal integrity and network compatibility.

Electrical Configuration: The 1/1 driver/receiver configuration and half-duplex operation mode must match exactly. Receiver hysteresis of 50 mV and data rate support of 500 kbps are mandatory equivalence criteria.

Supply Voltage Range: The substitute must operate across the full 3V to 5.5V supply range without deviation to ensure functionality across diverse power supply architectures.

Operating Temperature Range: The -40°C to 125°C temperature specification must be maintained to guarantee performance in industrial environments.

Mechanical Packaging: The 8-SOIC package with 0.154" (3.90mm) width is a hard requirement for PCB layout compatibility and automated assembly processes.

Compliance Standards: RoHS3 compliance and MSL 1 rating ensure regulatory alignment and moisture handling consistency.

The THVD1400DR meets all these criteria and is classified as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criterion: Both THVD1406DR and THVD1400DR are Active products with full RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements for industrial and commercial applications.

Inventory Availability: The THVD1400DR offers significantly higher inventory availability (5,000,400 pcs) compared to the THVD1406DR (8,765 pcs), making it the preferred choice for high-volume production runs or long-term supply chain continuity.

Compliance Alignment: Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, ensuring no change in export control or tariff treatment when substituting between these parts.

Packaging and Assembly: The identical 8-SOIC package specification ensures direct PCB footprint compatibility without layout modifications or assembly process changes.

Functional Equivalence: Complete parameter matching across electrical, thermal, and mechanical specifications confirms that THVD1400DR operates identically to THVD1406DR in all RS422/RS485 communication applications.

Frequently Asked Questions (FAQ)

Q: Can THVD1400DR be used as a direct replacement for THVD1406DR without circuit modifications?

A: Yes. The THVD1400DR is a parametric equivalent with identical electrical specifications, supply voltage range, operating temperature range, data rate capability, and 8-SOIC package dimensions. No circuit modifications are required.

Q: Are there differences in protocol support between these two parts?

A: No. Both parts support identical RS422 and RS485 protocols with 1/1 driver/receiver configuration and half-duplex operation mode.

Q: What is the significance of the 50 mV receiver hysteresis specification?

A: Receiver hysteresis of 50 mV defines the voltage differential required between the rising and falling threshold levels, ensuring noise immunity and stable signal detection in RS422/RS485 networks. Both parts maintain this specification identically.

Q: Do these parts have different moisture sensitivity requirements?

A: No. Both THVD1406DR and THVD1400DR carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions and no special storage or handling requirements.

Q: Is the 8-SOIC package footprint identical between both parts?

A: Yes. Both parts use the 8-SOIC package with 0.154" (3.90mm) width specification, ensuring identical PCB footprint and automated assembly compatibility.

Q: What is the maximum data rate supported by these transceivers?

A: Both parts support data rates up to 500 kbps, suitable for standard industrial RS422/RS485 communication networks.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical ECCN and HTSUS classifications.