TLC5951DAPR LED Driver IC Equivalent & Substitute Parts

Part Overview

The TLC5951DAPR is an active, production-status LED driver IC manufactured by Texas Instruments, designed for 24-output linear shift register applications in signage and display systems. This device operates across a 3V to 5.5V supply range with 40mA per-channel output capability and integrates internal switching functionality for efficient LED control. Substitute parts are identified to address specific application requirements such as alternative packaging formats, thermal operating ranges, or supply voltage constraints while maintaining functional compatibility through equivalent shift register topology and output channel configuration.

Substiute Parts

TLC5951DAPR

Texas InstrumentsIn Stock: 716TLC5951DAPR Datasheet

Current PartRFQ

MAX6974ATL+

Analog Devices Inc./Maxim IntegratedIn Stock: 910MAX6974ATL+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TLC5951DAPR is determined by the following critical parameters:

• Topology: Must be Shift Register with 24 output channels
• Type: Must be Linear LED driver
• Internal Switching: Must include internal switch functionality
• Output Channel Count: Must equal 24
• Supply Voltage Compatibility: Substitute must operate within or encompass the 3V to 5.5V range
• Current Rating: Substitute current per channel must meet or exceed application requirements
• Product Status: Must be Active
• Compliance: Must maintain ROHS3 and REACH compliance

The MAX6974ATL+ qualifies as a substitute based on matching topology (24-output linear shift register), equivalent internal switching architecture, and compatible supply voltage range (3V to 3.6V overlaps with the lower portion of the TLC5951DAPR range). Differences in output current (30mA vs. 40mA), package format (40-TQFN vs. 38-PowerTSSOP), and thermal operating range represent trade-offs that must be evaluated against specific application constraints.

Parameter Comparison

Engineering Selection Recommendations

Both the TLC5951DAPR and MAX6974ATL+ maintain Active product status and ROHS3 compliance, qualifying both for new designs. Selection between these parts depends on application-specific constraints:

The TLC5951DAPR is appropriate for applications requiring the full 3V to 5.5V supply voltage range and 40mA per-channel output current. The 38-PowerTSSOP package provides a compact footprint suitable for space-constrained layouts.

The MAX6974ATL+ is appropriate for applications operating within the 3V to 3.6V supply range where the 30mA per-channel output current is sufficient. The 40-TQFN package offers an alternative footprint and the extended -40°C to 125°C operating temperature range accommodates higher-temperature environments. The MSL 1 rating eliminates moisture sensitivity constraints during storage and handling.

Both devices maintain equivalent shift register topology and 24-output channel configuration, ensuring functional compatibility at the protocol level. PCB layout modifications are required due to package differences.

Frequently Asked Questions (FAQ)

Q: Can the MAX6974ATL+ directly replace the TLC5951DAPR in existing designs?

A: Direct replacement requires evaluation of three factors: (1) supply voltage must remain within 3V to 3.6V; (2) LED current requirements must not exceed 30mA per channel; (3) PCB layout must accommodate the 40-TQFN package footprint instead of 38-PowerTSSOP. If all three conditions are met, functional substitution is possible.

Q: What is the impact of the 10mA per-channel current difference?

A: The TLC5951DAPR provides 40mA per channel while the MAX6974ATL+ provides 30mA per channel. Applications requiring higher LED brightness or driving lower-impedance loads may not be compatible with the reduced current rating of the MAX6974ATL+.

Q: How do the package differences affect board design?

A: The TLC5951DAPR uses 38-PowerTSSOP (0.240", 6.10mm width) while the MAX6974ATL+ uses 40-WFQFN (6x6mm). These packages have different pin counts, pitch, and thermal characteristics. PCB footprints, trace routing, and thermal management strategies must be redesigned accordingly.

Q: Are there supply voltage compatibility issues?

A: The TLC5951DAPR operates from 3V to 5.5V, while the MAX6974ATL+ operates from 3V to 3.6V. If the application uses supply voltages above 3.6V, the MAX6974ATL+ is not compatible. The TLC5951DAPR must be retained for higher-voltage applications.

Q: What is the significance of the MSL rating difference?

A: The TLC5951DAPR has MSL 3 (168-hour limit), requiring controlled storage conditions and bake-out procedures before reflow soldering. The MAX6974ATL+ has MSL 1 (unlimited), eliminating moisture sensitivity concerns and simplifying supply chain handling.

Q: Do both parts support the same signage applications?

A: Both devices are specified for signage applications and maintain equivalent shift register topology. Compatibility depends on the specific current and voltage requirements of the signage system, as outlined in the parameter comparison.