SC445TETRT Equivalent & Substitute Parts

Part Overview

The SC445TETRT is a LED Driver IC with integrated 4-output DC-DC regulator featuring step-up (boost) topology and PWM dimming capability. Manufactured by Semtech Corporation, this component operates across a 4.5V to 27V supply range with 150mA per-channel output current and 700kHz switching frequency. The device is classified as Last Time Buy, indicating end-of-life status and necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

SC445TETRT

Semtech CorporationIn Stock: 15653SC445TETRT Datasheet

Current PartRFQ

ADD5207ACPZ-RL

Analog Devices Inc.In Stock: 28091ADD5207ACPZ-RL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC445TETRT requires functional equivalence across core electrical and mechanical parameters. The primary substitution candidate is the ADD5207ACPZ-RL from Analog Devices Inc., which shares the following critical characteristics:

Matching Parameters:

• DC-DC Regulator with step-up (boost) topology
• 4-output LED driver configuration
• PWM dimming capability
• Internal integrated switch
• Surface mount packaging with exposed pad
• RoHS compliance
• Active product status (ensuring long-term availability)

Parameter Variations Requiring Design Review:

• Supply voltage range: SC445TETRT operates 4.5V–27V; ADD5207ACPZ-RL operates 6V–21V
• Output voltage: SC445TETRT delivers 42V; ADD5207ACPZ-RL delivers 36V
• Per-channel current: SC445TETRT provides 150mA; ADD5207ACPZ-RL provides 25mA
• Switching frequency: SC445TETRT at 700kHz; ADD5207ACPZ-RL at 1MHz
• Dimming modes: SC445TETRT supports analog and PWM; ADD5207ACPZ-RL supports PWM only
• Package form factor: SC445TETRT in 20-TSSOP; ADD5207ACPZ-RL in 14-LFCSP (4x3)

Parameter Comparison

Engineering Selection Recommendations

The ADD5207ACPZ-RL qualifies as a functional substitute for the SC445TETRT based on shared topology, output configuration, and regulatory compliance. However, substitution feasibility depends on application-specific requirements:

Substitution is appropriate when:

• Application supply voltage operates within 6V–21V range (subset of SC445TETRT range)
• Output voltage requirement is 36V or lower
• Per-channel current demand does not exceed 25mA
• PWM dimming control is sufficient (analog dimming not required)
• PCB layout can accommodate 14-LFCSP (4x3) package footprint in place of 20-TSSOP

Substitution requires design modification when:

• Application requires supply voltage below 6V or above 21V
• Application requires output voltage above 36V
• Application requires per-channel current exceeding 25mA
• Application requires analog dimming capability
• PCB layout constraints prevent package footprint change

The ADD5207ACPZ-RL carries Active product status, ensuring component availability and manufacturer support, whereas the SC445TETRT is Last Time Buy. Both devices maintain RoHS compliance and surface-mount configuration suitable for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can the ADD5207ACPZ-RL directly replace the SC445TETRT without PCB modification?

A: No. The ADD5207ACPZ-RL uses a 14-LFCSP (4x3) package versus the SC445TETRT's 20-TSSOP package. PCB layout redesign is required, including new footprint, trace routing, and thermal management considerations. Pin-to-pin compatibility does not exist.

Q: What are the critical electrical differences between these parts?

A: The ADD5207ACPZ-RL operates within a narrower supply voltage range (6V–21V vs. 4.5V–27V), delivers lower per-channel current (25mA vs. 150mA), and supports PWM dimming only (versus analog and PWM on the SC445TETRT). Output voltage is also lower (36V vs. 42V).

Q: Is the ADD5207ACPZ-RL suitable for applications requiring 150mA per channel?

A: No. The ADD5207ACPZ-RL is rated for 25mA per channel maximum. Applications requiring 150mA per channel must use the SC445TETRT or identify alternative components with higher current ratings.

Q: Does the ADD5207ACPZ-RL support analog dimming?

A: No. The ADD5207ACPZ-RL supports PWM dimming only. Applications requiring analog dimming control must retain the SC445TETRT or select an alternative component with analog dimming capability.

Q: What is the impact of different switching frequencies (700kHz vs. 1MHz)?

A: The higher switching frequency of the ADD5207ACPZ-RL (1MHz) may reduce inductor and capacitor sizes, potentially lowering board area and component cost. However, this may increase switching losses and EMI characteristics. Application-specific power budget and EMI requirements determine acceptability.

Q: Are both devices RoHS compliant?

A: Yes. The SC445TETRT is RoHS Compliant, and the ADD5207ACPZ-RL is ROHS3 Compliant. Both meet RoHS requirements; the ADD5207ACPZ-RL meets the more restrictive ROHS3 standard.

Q: Why is the SC445TETRT marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer (Semtech Corporation) is discontinuing production. Existing inventory is available for final orders, but long-term supply cannot be guaranteed. The ADD5207ACPZ-RL, with Active status, provides a path to sustained component availability.

Q: Can I use the ADD5207ACPZ-RL in a design currently using the SC445TETRT?

A: Only if the application electrical requirements fall within the ADD5207ACPZ-RL's specifications (6V–21V supply, 36V output maximum, 25mA per channel maximum, PWM dimming only) and the PCB layout can be redesigned for the 14-LFCSP (4x3) package. Otherwise, alternative components must be evaluated.