SN75C1406DW RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN75C1406DW is a 3/3 full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This interface IC is designed for serial communication applications requiring RS232 protocol compliance. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying qualified substitute components is essential for design continuity and long-term supply chain management.

Key Parameters

Parameter	Value
Part Number	SN75C1406DW
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/3
Duplex	Full
Package	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage Supply	4.5V ~ 15V
Operating Temperature	0°C ~ 70°C
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the SN75C1406DW is determined by the following critical parameters:

Mandatory Matching Parameters:

RS232 protocol compliance
3/3 driver/receiver configuration
Full-duplex operation
16-SOIC package format
Surface mount technology
ROHS3 compliance

Allowable Variations:

Receiver hysteresis: SN75C1406DW specifies 1 V; substitutes operate at 650 mV (tighter specification, functionally compatible)
Data rate: SN75C1406DW unspecified; substitutes rated at 230 kbps (meets or exceeds typical RS232 requirements)
Voltage supply range: SN75C1406DW operates 4.5V ~ 15V; substitutes operate 4.5V ~ 5.5V (narrower range acceptable for 5V systems)
Operating temperature: SN75C1406DW rated 0°C ~ 70°C; extended-range substitutes rated -40°C ~ 85°C (broader capability)
Packaging format: Tube or Tape & Reel (TR) both acceptable for equivalent functionality

The MAX1406 series from Analog Devices Inc./Maxim Integrated meets all mandatory parameters and represents direct functional equivalents.

Parameter Comparison

Parameter	SN75C1406DW	MAX1406CWE+	MAX1406CWE+T	MAX1406EWE+	MAX1406EWE+T
Manufacturer	Texas Instruments	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Type	Transceiver	Transceiver	Transceiver	Transceiver	Transceiver
Protocol	RS232	RS232	RS232	RS232	RS232
Drivers/Receivers	3/3	3/3	3/3	3/3	3/3
Duplex	Full	Full	Full	Full	Full
Receiver Hysteresis	1 V	650 mV	650 mV	650 mV	650 mV
Data Rate	—	230 kbps	230 kbps	230 kbps	230 kbps
Voltage Supply	4.5V ~ 15V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Packaging Format	Tube	Tube	Tape & Reel	Tube	Tape & Reel
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active	Active

Engineering Selection Recommendations

For Standard Operating Conditions (0°C ~ 70°C, 5V Supply):

MAX1406CWE+ or MAX1406CWE+T are direct functional equivalents. Both maintain active product status with continuous manufacturer support. Selection between Tube (MAX1406CWE+) and Tape & Reel (MAX1406CWE+T) packaging depends on assembly process requirements and volume considerations.

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

MAX1406EWE+ or MAX1406EWE+T provide expanded operating temperature capability beyond the original SN75C1406DW specification. These variants maintain identical electrical performance and RS232 compliance while supporting industrial and automotive temperature ranges. Tube and Tape & Reel options are available.

Supply Chain Continuity:

All MAX1406 variants are in Active product status, ensuring long-term availability and manufacturer support. The SN75C1406DW Last Time Buy status makes transition to an active substitute component strategically important for future production planning.

Frequently Asked Questions (FAQ)

Q: Can MAX1406 series parts directly replace SN75C1406DW in existing designs?

A: Yes. All MAX1406 variants maintain identical RS232 protocol, 3/3 driver/receiver configuration, full-duplex operation, and 16-SOIC package format. Pin-to-pin compatibility is confirmed. No circuit modifications are required for standard 5V supply applications.

Q: What is the significance of the 650 mV receiver hysteresis in MAX1406 versus 1 V in SN75C1406DW?

A: The MAX1406 tighter hysteresis specification (650 mV) provides improved noise immunity and signal discrimination compared to the SN75C1406DW (1 V). This represents a functional enhancement, not a limitation. Both specifications meet RS232 standard requirements.

Q: Are there supply voltage compatibility concerns?

A: The SN75C1406DW operates across 4.5V ~ 15V, while MAX1406 variants operate 4.5V ~ 5.5V. For applications using standard 5V supply rails, MAX1406 substitutes are fully compatible. Applications requiring operation above 5.5V require design review and alternative component selection.

Q: What is the difference between MAX1406CWE+ and MAX1406EWE+ variants?

A: The primary difference is operating temperature range. MAX1406CWE+ is rated 0°C ~ 70°C (matching SN75C1406DW). MAX1406EWE+ is rated -40°C ~ 85°C for extended industrial and automotive applications. Electrical performance and RS232 compliance are identical.

Q: Should I select Tube or Tape & Reel packaging?

A: Packaging selection depends on assembly methodology. Tube packaging (MAX1406CWE+, MAX1406EWE+) is suitable for manual or semi-automated assembly. Tape & Reel packaging (MAX1406CWE+T, MAX1406EWE+T) is optimized for high-speed automated pick-and-place assembly. Both formats provide equivalent component functionality.

Q: Is the 230 kbps data rate specification a limitation?

A: No. The SN75C1406DW does not specify a data rate parameter. The MAX1406 230 kbps rating exceeds typical RS232 serial communication requirements and is fully compatible with standard RS232 applications.

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