MAX249CQH-D Equivalent & Substitute Parts

Part Overview

The MAX249CQH-D is a 6/10 transceiver IC implementing full-duplex RS232 communication in a 44-PLCC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs, maintenance, and production continuity. The MAX249CQH-D serves as a full RS232 transceiver suitable for applications requiring dual-channel driver and receiver functionality with 120 Kbps data rate capability.

Substiute Parts

MAX249CQH-D

Analog Devices Inc./Maxim IntegratedIn Stock: 982MAX249CQH-D Datasheet

Current PartRFQ

MAX249CQH+D

Analog Devices Inc./Maxim IntegratedIn Stock: 885MAX249CQH+D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX249CQH-D is determined by strict equivalence across the following critical parameters:

• Protocol: RS232 full-duplex transceiver
• Driver/Receiver Configuration: 6/10 channels
• Data Rate: 120 Kbps minimum
• Supply Voltage Range: 4.75V ~ 5.25V
• Package Type: 44-LCC (J-Lead) surface mount
• Receiver Hysteresis: 500 mV
• Operating Temperature Range: 0°C ~ 70°C
• Moisture Sensitivity Level: 3 (168 Hours)

The MAX249CQH+D meets all these parameters and qualifies as a parametric equivalent. The primary distinction between the main part and its substitute is product status and packaging format, not electrical or mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The MAX249CQH+D is the direct parametric equivalent for the obsolete MAX249CQH-D. Selection between these parts should be based on the following factors:

Product Status: The MAX249CQH-D is obsolete and no longer manufactured. The MAX249CQH+D is active and maintains full production availability, making it the appropriate choice for new designs and ongoing production requirements.

Compliance: The MAX249CQH+D achieves ROHS3 compliance, whereas the MAX249CQH-D is RoHS non-compliant. For applications subject to RoHS regulations, the MAX249CQH+D is the required selection.

Electrical and Mechanical Compatibility: Both parts are electrically and mechanically identical across all specified parameters. Pin configuration, signal levels, timing characteristics, and package dimensions are equivalent.

Packaging: The MAX249CQH+D is supplied in tube packaging, while the MAX249CQH-D was supplied in dip packaging. This difference does not affect component functionality or circuit performance.

Frequently Asked Questions (FAQ)

Q: Can MAX249CQH+D directly replace MAX249CQH-D in existing designs?

A: Yes. The MAX249CQH+D is a parametric equivalent with identical electrical specifications, pin configuration, and package dimensions. No circuit modifications are required.

Q: What is the difference between the "-D" and "+D" designations?

A: The "-D" and "+D" designations indicate different packaging formats and product status. The MAX249CQH-D is obsolete and was supplied in dip packaging. The MAX249CQH+D is active production and supplied in tube packaging. Electrical performance is identical.

Q: Are there any compliance differences between these parts?

A: Yes. The MAX249CQH+D is ROHS3 compliant, while the MAX249CQH-D is RoHS non-compliant. For applications requiring RoHS compliance, the MAX249CQH+D must be used.

Q: What is the 44-LCC (J-Lead) package?

A: The 44-LCC (J-Lead) is a 44-pin leadless ceramic chip carrier with J-shaped leads for surface mount assembly. The package dimensions are 16.59 x 16.59 mm. Both parts use this identical package type.

Q: Is the MAX249CQH+D available in stock?

A: Availability varies by supplier and time. The MAX249CQH+D is in active production status, ensuring long-term availability compared to the obsolete MAX249CQH-D.

Q: What does Moisture Sensitivity Level 3 (168 Hours) mean?

A: MSL 3 indicates the component can be exposed to moisture for up to 168 hours at specified temperature and humidity conditions before soldering. Both parts carry identical MSL ratings.