TL3695DR RS422/RS485 Half Transceiver Equivalent & Substitute Parts

Part Overview

The TL3695DR is a 1/1 half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The TL3695DR operates within a 4.75V to 5.25V supply voltage range with a 120 mV receiver hysteresis specification and is suitable for industrial communication applications requiring half-duplex serial data transmission.

Key Parameters

Parameter	TL3695DR
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	120 mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL3695DR is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility without layout redesign.

Protocol Support: The substitute must support RS422, RS485, or both protocols. Parts supporting only RS485 are acceptable as RS485 is a subset of the TL3695DR's functionality.

Electrical Configuration: The substitute must maintain 1/1 driver/receiver configuration in half-duplex mode.

Supply Voltage Range: The substitute's supply voltage range must encompass or be compatible with the 4.75V to 5.25V operating window of the TL3695DR. Parts with wider or overlapping voltage ranges are acceptable.

Operating Temperature: The substitute's temperature range should support the 0°C to 70°C minimum requirement of the TL3695DR.

Receiver Hysteresis: While the TL3695DR specifies 120 mV hysteresis, substitute parts with different hysteresis values (50 mV, 28 mV, 70 mV) are acceptable as this parameter does not prevent functional substitution in typical applications.

Data Rate: The TL3695DR does not specify a maximum data rate. Substitute parts with specified data rates of 10 Mbps or higher are suitable for general RS422/RS485 applications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Supply Voltage	Operating Temperature	Data Rate	Package	Product Status
TL3695DR	Texas Instruments	RS422, RS485	1/1	Half	120 mV	4.75V ~ 5.25V	0°C ~ 70°C	—	8-SOIC	Obsolete
THVD1550DR	Texas Instruments	RS485	1/1	Half	50 mV	4.5V ~ 5.5V	-40°C ~ 125°C	50 Mbps	8-SOIC	Active
ADM4853ARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Half	20 mV	4.75V ~ 5.25V	-40°C ~ 85°C	10 Mbps	8-SOIC	Active
HI-4853PSHF	Holt Integrated Circuits Inc.	RS422, RS485	1/1	Half	—	3.15V ~ 5.5V	-55°C ~ 175°C	20 Mbps	8-SOIC	Active
ISL3179EFBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Half	28 mV	3V ~ 3.6V	-40°C ~ 125°C	40 Mbps	8-SOIC	Active
ISL3179EIBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Half	28 mV	3V ~ 3.6V	-40°C ~ 125°C	40 Mbps	8-SOIC	Active
ISL3179EIBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Half	28 mV	3V ~ 3.6V	-40°C ~ 85°C	40 Mbps	8-SOIC	Active
ISL43485IBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Half	50 mV	3V ~ 3.6V	-40°C ~ 85°C	50 Mbps	8-SOIC	Active
ISL43485IBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Half	50 mV	3V ~ 3.6V	-40°C ~ 85°C	50 Mbps	8-SOIC	Active
ISL4485EIBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Half	70 mV	4.5V ~ 5.5V	-40°C ~ 85°C	20 Mbps	8-SOIC	Obsolete
ISL83483IBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Half	50 mV	3V ~ 3.6V	-40°C ~ 85°C	250 kbps	8-SOIC	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, Matching Supply Voltage):

ADM4853ARZ-REEL7 is the most direct substitute, maintaining the identical 4.75V to 5.25V supply voltage range and supporting both RS422 and RS485 protocols. This part is in active production status with ROHS3 compliance and provides extended operating temperature range (-40°C to 85°C) compared to the TL3695DR.

THVD1550DR is a Texas Instruments alternative supporting RS485 protocol with a slightly wider supply voltage range (4.5V to 5.5V) and superior data rate capability (50 Mbps). This part is in active production status with extended temperature range (-40°C to 125°C).

Secondary Substitutes (Active Status, Wider Supply Voltage Range):

HI-4853PSHF from Holt Integrated Circuits supports both RS422 and RS485 with the widest supply voltage range (3.15V to 5.5V) and extended operating temperature (-55°C to 175°C). This part accommodates the TL3695DR's 4.75V to 5.25V requirement with additional design flexibility.

Specialized Substitutes (3V Supply Domain):

ISL3179EIBZ-T, ISL43485IBZ-T, and ISL83483IBZ are Renesas parts designed for 3V to 3.6V supply operation. These are suitable only if system redesign to 3V operation is acceptable. All three maintain 8-SOIC packaging and half-duplex RS422/RS485 configuration.

Avoid:

ISL4485EIBZ is classified as obsolete and should not be selected for new designs despite meeting package and protocol requirements.

Frequently Asked Questions (FAQ)

Q: Can I use THVD1550DR as a direct replacement for TL3695DR?

A: Yes. THVD1550DR is pin-compatible in the 8-SOIC package, supports RS485 protocol (which is compatible with RS422/RS485 applications), and operates within the TL3695DR's 4.75V to 5.25V supply range. The wider supply voltage tolerance (4.5V to 5.5V) and higher data rate (50 Mbps) provide additional design margin.

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

A: Both parts are functionally identical with 28 mV receiver hysteresis and 40 Mbps data rate. The primary difference is packaging: ISL3179EIBZ is supplied in Tube packaging, while ISL3179EIBZ-T is supplied in Cut Tape (CT) & Digi-Reel format. The operating temperature range differs slightly: ISL3179EIBZ supports -40°C to 125°C, while ISL3179EIBZ-T supports -40°C to 85°C.

Q: Can I use a 3V supply part like ISL43485IBZ-T to replace TL3695DR?

A: No, not without system redesign. ISL43485IBZ-T operates on 3V to 3.6V supply, which is incompatible with the TL3695DR's 4.75V to 5.25V requirement. Substitution would require redesigning the power supply and potentially other circuit elements.

Q: Does receiver hysteresis variation affect substitution compatibility?

A: Receiver hysteresis differences (120 mV for TL3695DR versus 50 mV, 28 mV, or 70 mV for substitutes) do not prevent functional substitution. Hysteresis affects noise immunity and switching threshold characteristics but does not prevent the part from operating in RS422/RS485 applications. Application-specific testing may be warranted for noise-sensitive environments.

Q: Why is ISL4485EIBZ listed if it is obsolete?

A: ISL4485EIBZ is included for reference as a known substitute that meets package and protocol requirements. However, it is classified as obsolete and should not be selected for new designs. Active alternatives such as ADM4853ARZ-REEL7 or THVD1550DR are preferred.

Q: What is the significance of ROHS3 compliance for all listed parts?

A: All parts including the TL3695DR and all substitutes are ROHS3 compliant, indicating compliance with the Restriction of Hazardous Substances Directive. This ensures compatibility with environmental and regulatory requirements across manufacturing and end-use applications.

Q: Can ADM4853ARZ-REEL7 operate at the TL3695DR's full temperature range?

A: ADM4853ARZ-REEL7 operates from -40°C to 85°C, which exceeds the TL3695DR's 0°C to 70°C range. The substitute provides extended low-temperature operation (-40°C versus 0°C) and maintains the upper temperature limit at 85°C, which covers the TL3695DR's 70°C maximum.

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