SSL21084T/1,118 LED Driver IC - Equivalent & Substitute Parts

Part Overview

The SSL21084T/1,118 is an AC DC offline switcher LED driver IC manufactured by NXP USA Inc., designed for offline PWM dimming applications with 1A switch current capability. This part operates across an 8V to 16V supply range and features a step-down (buck) topology with internal switching capability. The SSL21084T/1,118 is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production continuity.

Substiute Parts

SSL21084T/1,118

NXP USA Inc.In Stock: 1004SSL21084T/1,118 Datasheet

Current PartRFQ

AL9901S16-13

Diodes IncorporatedIn Stock: 2413AL9901S16-13 Datasheet

MFR RecommendedRFQ

HV9921N8-G

Microchip TechnologyIn Stock: 10112HV9921N8-G Datasheet

MFR RecommendedRFQ

LT3799IMSE-1#PBF

Analog Devices Inc.In Stock: 1127LT3799IMSE-1#PBF Datasheet

MFR RecommendedRFQ

MP4032-1GS-Z

Monolithic Power SystemsIn Stock: 43223MP4032-1GS-Z Datasheet

MFR RecommendedRFQ

RT7304GE

Richtek USA Inc.In Stock: 23510RT7304GE Datasheet

MFR RecommendedRFQ

TPS92002DR

Texas InstrumentsIn Stock: 1152TPS92002DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SSL21084T/1,118 are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Type: AC DC Offline Switcher
• Topology: Step-Down (Buck) or compatible topologies (Flyback, Step-Up)
• Internal Switch(s): Yes (preferred for direct replacement)
• Number of Outputs: 1
• Dimming Capability: PWM or Triac dimming support
• Operating Temperature Range: Minimum -40°C to 125°C or compatible
• RoHS3 Compliance: Required
• Surface Mount Packaging: Required

The substitute parts listed below meet these core criteria while accommodating variations in supply voltage ranges, output current ratings, and package configurations. Substitutes are grouped by their ability to function in offline LED driver applications with appropriate dimming control.

Parameter Comparison

Engineering Selection Recommendations

AL9901S16-13 (Diodes Incorporated): Active product status with ROHS3 compliance and MSL 1 rating. Supports both analog and PWM dimming. Supply voltage range (15V–500V) exceeds the SSL21084T/1,118 minimum but accommodates higher input scenarios. Output current of 400mA is lower than the original 1A specification. Suitable for applications where reduced current capacity is acceptable.

HV9921N8-G (Microchip Technology): Active product with ROHS3 compliance and MSL 1 rating. Triac dimming support differs from the original PWM-only specification. Supply voltage range (20V–400V) and 20mA output current represent significant deviations from the original part. Package is SOT-89-3, requiring PCB layout modifications. Applicable to low-current lighting applications.

LT3799IMSE-1#PBF (Analog Devices Inc.): Active product with ROHS3 compliance and MSL 1 rating. Operating temperature range matches the original (-40°C to 125°C). Flyback topology differs from the original step-down configuration. No internal switch, requiring external switching components. Triac dimming capability. Suitable for designs where external switching architecture is preferred.

MP4032-1GS-Z (Monolithic Power Systems): Active product with ROHS3 compliance. Operating temperature range (-40°C to 125°C) matches the original. Output current of 1A matches the SSL21084T/1,118 specification. Flyback topology with internal switch. Triac dimming support. Supply voltage range (10.3V–27V) overlaps with the original. MSL 2 rating requires 1-year shelf life management. Direct current capability match makes this a strong functional equivalent.

RT7304GE (Richtek USA Inc.): Active product with ROHS3 compliance. Operating temperature range (-40°C to 125°C) matches the original. Multi-topology support (Flyback, Step-Down, Step-Up). No internal switch, requiring external switching components. Supply voltage range (12V–25V) overlaps with the original. MSL 3 rating requires 168-hour shelf life management. Suitable for flexible topology applications.

TPS92002DR (Texas Instruments): Last Time Buy status indicates limited future availability. ROHS3 compliant with MSL 1 rating. Operating temperature range (-40°C to 85°C) is narrower than the original. Flyback and step-down topology support. No internal switch. Triac dimming capability. Supply voltage maximum of 21V overlaps with the original range. Suitable for near-term production only.

Frequently Asked Questions (FAQ)

Q: Can AL9901S16-13 directly replace SSL21084T/1,118 in existing designs? A: AL9901S16-13 is functionally compatible as an AC DC offline switcher with PWM dimming support. However, the 400mA output current is lower than the original 1A specification. Circuit redesign may be required if the application demands the full 1A output current. Package differences (16-SOIC vs. 12-lead configuration) require PCB layout modifications.

Q: What is the primary difference between HV9921N8-G and the original SSL21084T/1,118? A: HV9921N8-G uses Triac dimming instead of PWM dimming and operates at significantly lower output current (20mA vs. 1A). The SOT-89-3 package is substantially smaller than the original 14-SOIC configuration. This part is suitable only for low-current lighting applications with Triac-compatible dimming control.

Q: Why does LT3799IMSE-1#PBF lack an internal switch? A: LT3799IMSE-1#PBF is designed as a controller IC requiring external switching components. This architecture provides design flexibility for applications requiring custom switching configurations. The absence of an internal switch increases component count and PCB area compared to the SSL21084T/1,118.

Q: Is MP4032-1GS-Z the closest equivalent to SSL21084T/1,118? A: MP4032-1GS-Z matches the original 1A output current specification and supports the same operating temperature range (-40°C to 125°C). Both feature internal switches and AC DC offline switcher topology. The primary difference is topology (Flyback vs. Step-Down) and dimming method (Triac vs. PWM). MSL 2 rating requires managed storage conditions compared to the original MSL 1.

Q: What packaging considerations apply when substituting these parts? A: Package variations range from SOT-23-6 (smallest) to 16-SOIC (largest). PCB footprint, trace routing, and thermal management requirements differ significantly. AL9901S16-13, MP4032-1GS-Z, and TPS92002DR use SOIC packages compatible with standard surface mount assembly. HV9921N8-G (SOT-89-3) and RT7304GE (SOT-23-6) require different land patterns and assembly considerations.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts are ROHS3 compliant, matching the original SSL21084T/1,118 compliance status. Moisture sensitivity levels vary from MSL 1 (unlimited shelf life) to MSL 3 (168-hour shelf life), affecting storage and handling requirements.

Q: Which substitute part has the longest product lifecycle? A: AL9901S16-13, HV9921N8-G, LT3799IMSE-1#PBF, MP4032-1GS-Z, and RT7304GE are all active products with ongoing manufacturer support. TPS92002DR is in Last Time Buy status, indicating limited future availability. For long-term production continuity, active products are preferred.