SSL5021BTS/1X LED Driver IC Equivalent & Substitute Parts

Part Overview

The SSL5021BTS/1X is a GreenChip™ LED Driver IC manufactured by NXP USA Inc., designed as a single-output DC-DC step-down (buck) regulator with integrated 2A switching capability for LED applications. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SSL5021BTS/1X operates across a 9.5V to 16V supply range and is housed in an SC-74 surface mount package, suitable for compact LED driver implementations requiring efficient power conversion.

Key Parameters

Parameter	SSL5021BTS/1X
Manufacturer	NXP USA Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Down (Buck)
Internal Switch(s)	Yes
Number of Outputs	1
Voltage - Supply (Min)	9.5V
Voltage - Supply (Max)	16V
Current - Output / Channel	2A (Switch)
Operating Temperature	-40°C ~ 160°C (TJ)
Mounting Type	Surface Mount
Package / Case	SC-74, SOT-457
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the SSL5021BTS/1X is determined by the following critical parameters:

Topology: Step-Down (Buck) regulation with integrated switching capability
Supply Voltage Range: Input voltage compatibility within or overlapping 9.5V to 16V
Output Current: Minimum 2A switching capability
Number of Outputs: Single output configuration
Internal Switch: Integrated power switch required
Package Type: Surface mount with compatible pinout and thermal characteristics
Compliance: ROHS3 compliance and industrial temperature range support

Substitute parts are grouped based on topology alignment and electrical parameter compatibility. Parts with different topologies (boost, flyback) or significantly different voltage/current ratings are included where they serve equivalent functional roles in LED driver applications, though with noted parameter differences requiring circuit redesign consideration.

Parameter Comparison

Parameter	SSL5021BTS/1X	A6211GLJTR-T	AP5724FDCG-7	MP4033GK	NCP3066DR2G	TPS611781RNWT
Manufacturer	NXP USA Inc.	Allegro MicroSystems	Diodes Incorporated	Monolithic Power Systems	onsemi	Texas Instruments
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	Boost Switching Regulator IC
Topology	Step-Down (Buck)	Step-Down (Buck)	Step-Up (Boost)	Flyback	Step-Down (Buck), Step-Up (Boost)	Boost
Internal Switch(s)	Yes	Yes	Yes	No	Yes	Yes
Number of Outputs	1	1	1	1	1	1
Voltage - Supply (Min)	9.5V	6V	2.7V	11V	3V	2.7V
Voltage - Supply (Max)	16V	48V	5.5V	27V	40V	20V
Current - Output / Channel	2A (Switch)	3A	750mA (Switch)	-	1.5A (Switch)	10A (Switch)
Operating Temperature	-40°C ~ 160°C (TJ)	-40°C ~ 105°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	0°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-74, SOT-457	8-SOIC (0.154", 3.90mm Width) Exposed Pad	6-UDFN Exposed Pad	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)	8-SOIC (0.154", 3.90mm Width)	13-PowerVFQFN
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Active	Active

Engineering Selection Recommendations

A6211GLJTR-T (Allegro MicroSystems) — Direct topology match with step-down buck regulation and 3A output capability, exceeding the SSL5021BTS/1X 2A requirement. Supply voltage range 6V to 48V encompasses the original 9.5V to 16V specification. Active product status with ROHS3 compliance. Package is 8-SOIC-EP, requiring PCB layout modification from SC-74. Operating temperature maximum of 105°C (TA) is lower than the original 160°C (TJ).

NCP3066DR2G (onsemi) — Dual-topology capability (buck and boost) with 1.5A output current and wide supply range 3V to 40V. Active product status with ROHS3 compliance. 8-SOIC package compatible with A6211GLJTR-T footprint considerations. Operating temperature 0°C to 85°C (TA) is lower than original specification. Suitable for applications requiring topology flexibility.

TPS611781RNWT (Texas Instruments) — Boost topology with 10A output capability and wide input range 2.7V to 20V. Active product status with ROHS3 compliance. Topology differs from original buck configuration, requiring circuit redesign. Operating temperature -40°C to 125°C (TJ) meets extended range requirements. 13-PowerVFQFN package requires significant PCB layout changes.

AP5724FDCG-7 (Diodes Incorporated) — Boost topology with 750mA output and narrow supply range 2.7V to 5.5V. Topology and voltage specifications differ significantly from SSL5021BTS/1X. Active product status with ROHS3 compliance. Suitable only for applications with substantially different input voltage requirements.

MP4033GK (Monolithic Power Systems) — Flyback topology without integrated switch, operating range 11V to 27V. Topology differs fundamentally from buck regulation. Active product status with ROHS3 compliance. Requires external switching components and circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can A6211GLJTR-T directly replace SSL5021BTS/1X without circuit modification?

A: A6211GLJTR-T provides equivalent buck topology and exceeds current capability (3A vs. 2A). However, package change from SC-74 to 8-SOIC-EP requires PCB layout modification. Pinout compatibility must be verified against specific application schematics. Operating temperature maximum differs (105°C TA vs. 160°C TJ).

Q: What is the primary difference between buck and boost topologies in LED driver selection?

A: Buck (step-down) regulators reduce input voltage to lower output levels, suitable for high-input-voltage LED applications. Boost (step-up) regulators increase input voltage to higher output levels, suitable for low-input-voltage LED applications. SSL5021BTS/1X uses buck topology; TPS611781RNWT and AP5724FDCG-7 use boost topology, requiring different circuit designs.

Q: Is NCP3066DR2G suitable as a direct replacement?

A: NCP3066DR2G offers buck and boost capability with 1.5A output, lower than SSL5021BTS/1X 2A specification. 8-SOIC package is compatible with A6211GLJTR-T footprint. Operating temperature range 0°C to 85°C is narrower than original. Suitable for applications not requiring full 2A output or extended temperature range.

Q: Why does MP4033GK lack an internal switch?

A: MP4033GK uses flyback topology, which requires external switching components for operation. This topology is fundamentally different from the integrated-switch buck design of SSL5021BTS/1X. Selection of MP4033GK requires complete circuit redesign and is not a direct substitute.

Q: What packaging considerations apply when selecting a substitute?

A: SSL5021BTS/1X uses SC-74 (SOT-457) package. Substitute parts use 8-SOIC, 6-UDFN, 10-MSOP, or 13-PowerVFQFN packages. Each package change requires PCB layout redesign, trace routing modifications, and thermal management evaluation. Pin count and thermal pad characteristics differ across packages.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the original SSL5021BTS/1X compliance status. All parts are also REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the inventory status of substitute parts?

A: A6211GLJTR-T has 16,300 units in stock. NCP3066DR2G has 16,834 units in stock. TPS611781RNWT has 3,700 units in stock. AP5724FDCG-7 has 1,525 units in stock. MP4033GK has 1,098 units in stock. All substitute parts are active products with established supply chains.

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