SN75C1406DR Equivalent & Substitute Parts

Part Overview

The SN75C1406DR is a full-duplex RS232 transceiver manufactured by Texas Instruments, featuring 3 drivers and 3 receivers in a 16-SOIC surface mount package. This device is classified as Last Time Buy, indicating end-of-life status. The identification of equivalent and substitute parts is necessary to ensure design continuity and procurement flexibility for applications requiring RS232 interface functionality with matching electrical and mechanical specifications.

Substiute Parts

SN75C1406DR

Texas InstrumentsIn Stock: 3641SN75C1406DR Datasheet

Current PartRFQ

MAX1406CWE+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1977MAX1406CWE+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for RS232 transceiver devices is determined by the following critical parameters:

• Protocol compatibility: RS232 full-duplex transceiver function
• Driver/Receiver configuration: 3/3 channel architecture
• Package type: 16-SOIC surface mount form factor
• Supply voltage range: Compatibility with system power requirements
• Operating temperature range: Functional performance within specified thermal limits
• RoHS and regulatory compliance: Alignment with manufacturing and environmental standards

The MAX1406CWE+T qualifies as a substitute based on matching protocol, channel configuration, package family, and compliance certifications. Differences in receiver hysteresis, data rate specification, supply voltage range, and package dimensions are noted for engineering evaluation.

Parameter Comparison

Engineering Selection Recommendations

The MAX1406CWE+T is an active substitute for the SN75C1406DR based on functional equivalence in RS232 transceiver architecture, channel configuration, and regulatory compliance. Both devices maintain ROHS3 compliance and identical operating temperature specifications.

Design considerations for substitution include:

• Supply voltage range: The MAX1406CWE+T operates within 4.5V to 5.5V, which is a subset of the SN75C1406DR range (4.5V to 15V). Designs operating above 5.5V require verification of system compatibility.
• Package dimensions: Both devices use 16-SOIC packaging but with different pitch specifications (3.90mm versus 7.50mm width). PCB layout and footprint compatibility must be confirmed.
• Receiver hysteresis: The MAX1406CWE+T specifies 650 mV hysteresis compared to 1 V for the SN75C1406DR. Signal integrity analysis may be required for noise-sensitive applications.
• Product status: The MAX1406CWE+T is actively manufactured, providing long-term availability compared to the Last Time Buy status of the SN75C1406DR.

Frequently Asked Questions (FAQ)

Q: Can the MAX1406CWE+T directly replace the SN75C1406DR in existing designs?

A: Functional substitution is possible for applications operating within the MAX1406CWE+T supply voltage range (4.5V to 5.5V). PCB footprint compatibility must be verified due to different 16-SOIC package pitch specifications. Designs requiring supply voltages above 5.5V are not compatible with the substitute.

Q: What is the significance of the different receiver hysteresis values?

A: Receiver hysteresis affects the noise immunity and switching threshold characteristics of the RS232 input stage. The MAX1406CWE+T specifies 650 mV compared to 1 V for the SN75C1406DR. Applications with marginal signal quality or high noise environments should evaluate this parameter.

Q: Are both devices RoHS compliant?

A: Yes, both the SN75C1406DR and MAX1406CWE+T are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why does the MAX1406CWE+T have a narrower supply voltage range?

A: The MAX1406CWE+T is optimized for standard 5V logic systems, while the SN75C1406DR supports extended voltage operation up to 15V. System power supply specifications determine which device is appropriate for a given application.

Q: What packaging considerations apply to substitution?

A: Both devices use 16-SOIC surface mount packages but with different pitch specifications. The SN75C1406DR uses 0.154" (3.90mm) width, while the MAX1406CWE+T uses 0.295" (7.50mm) width. PCB footprint redesign may be necessary for physical compatibility.

Q: Is the MAX1406CWE+T available in the same packaging format as the SN75C1406DR?

A: The SN75C1406DR is supplied in Cut Tape (CT) packaging, while the MAX1406CWE+T is supplied in Tape & Reel (TR) format. Both are surface mount 16-SOIC packages but with different pitch and packaging presentation.