SC446TETRT Equivalent & Substitute Parts

Part Overview

The SC446TETRT is an LED Driver IC with integrated DC-DC regulator functionality, manufactured by Semtech Corporation. This device features a 3-output Step-Up (Boost) topology with analog and PWM dimming capabilities, designed for backlight applications. The part is currently listed as obsolete, making equivalent substitute components necessary for ongoing design support and procurement.

Substiute Parts

SC446TETRT

Semtech CorporationIn Stock: 6075SC446TETRT Datasheet

Current PartRFQ

ISL97683IRTZ

Renesas Electronics CorporationIn Stock: 1154ISL97683IRTZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SC446TETRT is determined by the following critical parameters:

• Topology: Step-Up (Boost) DC-DC regulator with 3 outputs
• Voltage Range: Supply voltage compatibility within 4.5V minimum and output capability to 36V minimum
• Current Capacity: Minimum 100mA per channel output current
• Dimming Control: Support for PWM dimming (analog dimming is optional)
• Package Type: Surface mount with 16-pin configuration
• Operating Temperature: Minimum -40°C to 85°C range
• Internal Switch: Integrated switching element required

The ISL97683IRTZ from Renesas Electronics Corporation meets the core functional requirements as a 3-output Step-Up LED driver with PWM dimming, though with reduced output current per channel (50mA vs. 100mA) and lower maximum output voltage (45V vs. 36V).

Parameter Comparison

Engineering Selection Recommendations

The ISL97683IRTZ is the manufacturer-recommended substitute for the SC446TETRT. As an active product from Renesas Electronics Corporation, it provides ongoing availability and support compared to the obsolete SC446TETRT.

Key considerations for selection:

• Product Status: ISL97683IRTZ is active; SC446TETRT is obsolete. Active status ensures long-term supply chain viability.
• Compliance: ISL97683IRTZ carries RoHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.
• Output Current: ISL97683IRTZ provides 50mA per channel versus 100mA on the original part. Applications requiring full 100mA per channel must evaluate load requirements.
• Maximum Output Voltage: ISL97683IRTZ supports 45V output, exceeding the SC446TETRT's 36V specification.
• Operating Temperature Range: ISL97683IRTZ operates to 85°C maximum versus 105°C on the original. Thermal environment compatibility must be verified.
• Package Transition: ISL97683IRTZ uses 16-WFQFN versus 16-TSSOP on the original. PCB layout modifications are required.
• Dimming Capability: ISL97683IRTZ supports PWM dimming only; analog dimming is not available. Design implementations using analog dimming require circuit modification.

Frequently Asked Questions (FAQ)

Q: Can ISL97683IRTZ directly replace SC446TETRT without PCB modifications?

A: No. The ISL97683IRTZ uses a 16-WFQFN package while the SC446TETRT uses 16-TSSOP. Different pin configurations and footprints require PCB layout redesign.

Q: What is the impact of reduced output current (50mA vs. 100mA) on my application?

A: The ISL97683IRTZ provides 50mA per output channel. Applications requiring 100mA per channel must either reduce load current or implement parallel output configurations if the design topology permits.

Q: Does ISL97683IRTZ support analog dimming like the original part?

A: No. The ISL97683IRTZ supports PWM dimming only. Applications requiring analog dimming control must implement external dimming circuitry or select an alternative substitute.

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

A: SC446TETRT has MSL 1 (unlimited shelf life); ISL97683IRTZ has MSL 3 (168-hour limit). MSL 3 components require controlled storage conditions and have a limited shelf life after moisture exposure.

Q: Is the operating temperature range difference critical?

A: ISL97683IRTZ operates to 85°C maximum versus 105°C on the SC446TETRT. Applications operating above 85°C ambient or with high thermal loads require thermal analysis to confirm compatibility.

Q: Are there other substitute options available?

A: The ISL97683IRTZ datasheet references additional substitutes: TPS61310YFFR, TPS61305YFFR, TPS61311YFFR, and MAX8834YEWP+T. Each requires individual parameter evaluation against application requirements.