RT8555BWSC Equivalent & Substitute Parts

Part Overview

The RT8555BWSC is an LED driver IC manufactured by Richtek USA Inc., designed for backlight applications requiring multi-output DC-DC regulation. This active product integrates a 6-output step-up (boost) converter with analog and PWM dimming capabilities, operating from a 2.7V to 24V supply and delivering up to 36V output at 35mA per channel. The device is housed in a 20-WLCSP (1.65x2.05mm) package suitable for space-constrained surface mount applications.

Identifying equivalent and substitute parts is necessary when the primary part number becomes unavailable, when alternative packaging or moisture sensitivity requirements must be met, or when supply chain optimization is required while maintaining identical electrical and mechanical performance.

Substiute Parts

RT8555BWSC

Richtek USA Inc.In Stock: 1648RT8555BWSC Datasheet

Current PartRFQ

RT8555WSC

Richtek USA Inc.In Stock: 1526RT8555WSC Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The RT8555BWSC has one parametric equivalent: RT8555WSC. This substitution is valid based on the following criteria:

Both parts share identical electrical specifications across all critical parameters: 6-output topology, 2.7V to 24V input range, 36V output voltage, 35mA per-channel current rating, 300kHz to 2MHz frequency range, and analog/PWM dimming capability. Both are manufactured by Richtek USA Inc. and use the same 20-WLCSP (1.65x2.05mm) package footprint, ensuring mechanical and electrical compatibility at the board level.

The primary difference between these parts is packaging format and moisture sensitivity level (MSL). The RT8555BWSC is supplied in standard packaging with MSL 3 (168 hours), while the RT8555WSC is available in Cut Tape (CT) and Digi-Reel® format with MSL 1 (unlimited). This distinction affects storage and handling requirements but does not impact functional performance or electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both RT8555BWSC and RT8555WSC are active products with identical ROHS3 compliance and REACH unaffected status, making either suitable for new designs and production environments with equivalent regulatory standing.

Selection between these parts should be based on supply chain and storage requirements. The RT8555WSC, with MSL 1 (unlimited moisture sensitivity), is appropriate for applications with extended storage periods or environments with high humidity exposure. The RT8555BWSC, with MSL 3 (168 hours), is suitable for high-volume manufacturing environments with controlled storage conditions and rapid component utilization.

Both parts are electrically and mechanically interchangeable at the board level. No circuit modifications or layout adjustments are required when substituting between these part numbers.

Frequently Asked Questions (FAQ)

Q: Are RT8555BWSC and RT8555WSC pin-compatible?

A: Yes. Both parts use the identical 20-WLCSP (1.65x2.05mm) package with the same pinout, footprint, and electrical interface. Direct substitution on the PCB is possible without layout modifications.

Q: What is the difference between MSL 3 and MSL 1?

A: Moisture Sensitivity Level (MSL) defines the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before baking is required. MSL 3 allows 168 hours of exposure; MSL 1 has unlimited exposure time. MSL 1 components are more tolerant of extended storage and humid environments.

Q: Can I use RT8555WSC in place of RT8555BWSC in production?

A: Yes. The electrical and mechanical specifications are identical. The choice depends on your supply chain logistics and storage conditions. RT8555WSC offers greater flexibility for inventory management due to its lower moisture sensitivity.

Q: Are there any performance differences between these parts?

A: No. Both parts deliver identical electrical performance: 6-output boost regulation, 2.7V to 24V input, 36V output, 35mA per channel, and analog/PWM dimming control.

Q: What packaging formats are available?

A: RT8555BWSC is supplied in standard packaging. RT8555WSC is available in Cut Tape (CT) and Digi-Reel® formats, offering flexibility for automated assembly processes.