TL3695D RS422/RS485 Half Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The TL3695D is a half duplex RS422/RS485 transceiver manufactured by Texas Instruments in 8-SOIC surface mount packaging. This interface IC operates at 4.75V to 5.25V supply voltage with a 120 mV receiver hysteresis specification. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	TL3695D Specification
Manufacturer	Texas Instruments
Type	Transceiver Half Duplex
Protocol Support	RS422, RS485
Drivers/Receivers	1/1
Package	8-SOIC (0.154", 3.90mm Width)
Supply Voltage	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	120 mV
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant
Moisture Sensitivity	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TL3695D is determined by the following critical parameters:

Package Compatibility: 8-SOIC form factor (0.154", 3.90mm Width) for direct PCB footprint replacement
Duplex Mode: Half duplex operation required
Protocol Support: RS422 and/or RS485 compatibility
Driver/Receiver Configuration: 1/1 topology
Supply Voltage Range: Compatibility with 4.75V ~ 5.25V nominal operation
Compliance Standards: ROHS3 compliance and EAR99 classification

Substitute parts are grouped into two categories: direct replacements maintaining identical electrical operating ranges, and functional equivalents with extended or modified specifications that remain compatible within system design constraints.

Parameter Comparison

Part Number	Manufacturer	Protocol	Duplex	Package	Supply Voltage	Operating Temp	Receiver Hysteresis	Data Rate	Product Status
TL3695D	Texas Instruments	RS422, RS485	Half	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	120 mV	—	Obsolete
THVD1550DR	Texas Instruments	RS485	Half	8-SOIC	4.5V ~ 5.5V	-40°C ~ 125°C	50 mV	50 Mbps	Active
ADM4853ARZ	Analog Devices Inc.	RS422, RS485	Half	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	20 mV	10 Mbps	Active
HI-4853PSHF	Holt Integrated Circuits Inc.	RS422, RS485	Half	8-SOIC	3.15V ~ 5.5V	-55°C ~ 175°C	—	20 Mbps	Active
ISL3179EFBZ	Renesas Electronics	RS422, RS485	Half	8-SOIC	3V ~ 3.6V	-40°C ~ 125°C	28 mV	40 Mbps	Active
ISL3179EIBZ	Renesas Electronics	RS422, RS485	Half	8-SOIC	3V ~ 3.6V	-40°C ~ 125°C	28 mV	40 Mbps	Active
ISL3179EIBZ-T	Renesas Electronics	RS422, RS485	Half	8-SOIC	3V ~ 3.6V	-40°C ~ 85°C	28 mV	40 Mbps	Active
ISL43485IBZ	Renesas Electronics	RS422, RS485	Half	8-SOIC	3V ~ 3.6V	-40°C ~ 85°C	50 mV	50 Mbps	Active
ISL43485IBZ-T	Renesas Electronics	RS422, RS485	Half	8-SOIC	3V ~ 3.6V	-40°C ~ 85°C	50 mV	50 Mbps	Active
ISL4485EIBZ	Renesas Electronics	RS422, RS485	Half	8-SOIC	4.5V ~ 5.5V	-40°C ~ 85°C	70 mV	20 Mbps	Obsolete

Engineering Selection Recommendations

Primary Recommendation: ADM4853ARZ

The ADM4853ARZ from Analog Devices Inc. provides the closest electrical alignment to the TL3695D. Both devices operate within the 4.75V to 5.25V supply voltage range, support dual RS422/RS485 protocols, and maintain half duplex 1/1 transceiver configuration in 8-SOIC packaging. The ADM4853ARZ is active product status with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and manufacturing consistency.

Secondary Recommendation: THVD1550DR

The THVD1550DR from Texas Instruments offers active product status with extended operating temperature range (-40°C to 125°C) and higher data rate capability (50 Mbps). Supply voltage range extends to 4.5V ~ 5.5V, providing broader system compatibility. This device is suitable for applications requiring enhanced performance specifications beyond the original TL3695D baseline.

Extended Temperature Applications: HI-4853PSHF

The HI-4853PSHF from Holt Integrated Circuits Inc. supports extreme temperature operation (-55°C to 175°C) with extended supply voltage range (3.15V ~ 5.5V). This device accommodates industrial and automotive applications requiring wider environmental specifications while maintaining RS422/RS485 protocol support and 8-SOIC packaging.

Low Voltage Alternatives: ISL3179 and ISL43485 Series

Renesas Electronics ISL3179EIBZ, ISL3179EIBZ-T, ISL43485IBZ, and ISL43485IBZ-T devices operate at 3V ~ 3.6V supply voltage, enabling integration into low-voltage system architectures. These parts maintain 8-SOIC packaging and half duplex RS422/RS485 operation. ISL43485 variants provide 50 Mbps data rate performance. All Renesas devices carry active product status with ROHS3 compliance.

All recommended substitutes maintain ROHS3 compliance, EAR99 classification, and REACH unaffected status consistent with the original TL3695D specification.

Frequently Asked Questions (FAQ)

Q: Can the TL3695D be directly replaced with any 8-SOIC RS485 transceiver?

A: No. Direct substitution requires matching the half duplex 1/1 configuration, RS422/RS485 protocol support, and 8-SOIC package form factor. Supply voltage compatibility with the 4.75V ~ 5.25V range is critical for systems designed around the original specification. The ADM4853ARZ and THVD1550DR meet these core requirements.

Q: What is the significance of receiver hysteresis in transceiver selection?

A: Receiver hysteresis affects noise immunity and signal detection margins. The TL3695D specifies 120 mV hysteresis. Substitute parts with lower hysteresis values (ADM4853ARZ at 20 mV, ISL3179 series at 28 mV) provide tighter noise margins but may require careful PCB layout. Higher hysteresis values (ISL4485EIBZ at 70 mV) offer greater noise tolerance in electrically noisy environments.

Q: Are Renesas ISL3179 and ISL43485 devices compatible with 5V systems?

A: ISL3179 and ISL43485 series operate at 3V ~ 3.6V supply voltage and are not directly compatible with 5V-only systems. These devices are suitable for 3.3V logic systems or mixed-voltage architectures with appropriate level translation. For 5V system compatibility, select ADM4853ARZ, THVD1550DR, or HI-4853PSHF.

Q: What packaging options are available for substitute parts?

A: All substitute parts maintain 8-SOIC (0.154", 3.90mm Width) surface mount packaging for PCB footprint compatibility. Packaging variants include Tube and Cut Tape (CT) & Digi-Reel® options. Verify packaging format availability with your supplier for production requirements.

Q: How do data rate specifications affect system compatibility?

A: The TL3695D does not specify a maximum data rate. Substitute parts range from 10 Mbps (ADM4853ARZ) to 50 Mbps (THVD1550DR, ISL43485 series). Select devices based on actual system communication speed requirements. Higher data rate devices remain backward compatible with lower-speed applications.

Q: What is the difference between ISL3179EIBZ and ISL3179EIBZ-T?

A: Both devices share identical electrical specifications (3V ~ 3.6V supply, 40 Mbps data rate, 28 mV hysteresis). The primary difference is packaging format: ISL3179EIBZ is supplied in Tube, while ISL3179EIBZ-T is supplied in Cut Tape (CT) & Digi-Reel®. Electrical performance and MSL 3 moisture sensitivity are identical.

Q: Can obsolete substitute parts be used as long-term solutions?

A: ISL4485EIBZ is classified as obsolete and should not be selected for new designs or long-term production. Active product status devices (ADM4853ARZ, THVD1550DR, HI-4853PSHF, ISL3179 series, ISL43485 series) ensure ongoing manufacturing availability and supply chain stability.

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