AL8821SP-13 Equivalent & Substitute Parts

Part Overview

The AL8821SP-13 is an LED Driver IC manufactured by Diodes Incorporated, designed for AC DC offline switching applications with Step-Up (Boost) topology and Triac dimming capability. This component delivers 2A switch current and operates across a 5V to 36V supply range with a 1MHz switching frequency. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility in offline LED driver applications while meeting the electrical and mechanical constraints of the original design.

Key Parameters

Parameter	AL8821SP-13
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Product Status	Obsolete
Type	AC DC Offline Switcher
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage - Supply (Min)	5V
Voltage - Supply (Max)	36V
Voltage - Output	36V
Current - Output / Channel	2A (Switch)
Frequency	1MHz
Dimming	Triac
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the AL8821SP-13 are selected based on the following critical parameters that determine functional compatibility:

Primary Selection Criteria:

Type: AC DC Offline Switcher
Topology: Step-Up (Boost) or compatible multi-topology support
Number of Outputs: 1
Voltage Supply Range: Minimum 5V, Maximum ≥36V
Current Capability: 2A or greater switch current
Package: 8-SOIC or equivalent surface mount package
Operating Temperature: Support for -40°C minimum and ≥105°C maximum
Dimming Capability: Triac, PWM, or Analog dimming support
RoHS Compliance: ROHS3 Compliant

Grouping Logic: Substitute parts are organized by topology alignment and dimming method. Parts maintaining Step-Up (Boost) topology with Triac dimming represent the closest functional equivalents. Parts supporting Step-Down (Buck) or multi-topology configurations with PWM or Analog dimming provide alternative solutions for offline LED driver applications where topology flexibility is acceptable.

Parameter Comparison

Parameter	AL8821SP-13	AL8822SP-13	CPC9909NTR	LYT2004K-TL	MP4054AGJ-P	NCL30060B2DR2G	NCL30082DDR2G	RT8487GJ6
Manufacturer	Diodes Inc.	Diodes Inc.	IXYS	Power Integrations	MPS Inc.	Fairchild	onsemi	Richtek
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Type	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Down (Buck), Step-Up (Boost)	Flyback	Step-Down (Buck), Step-Up (Boost)	Flyback, Step-Down (Buck)	Flyback	Step-Down (Buck)
Number of Outputs	1	1	1	1	1	1	1	1
Voltage - Supply (Min)	5V	5V	8V	—	12V	8.8V	8.8V	10V
Voltage - Supply (Max)	36V	36V	550V	—	28V	28V	20V	30V
Current - Output / Channel	2A (Switch)	2A	—	—	—	—	—	—
Frequency	1MHz	1MHz	30kHz ~ 120kHz	85kHz	5kHz	—	—	—
Dimming	Triac	—	PWM	—	PWM	—	Analog, PWM	—
Operating Temperature (Min)	-40°C	-40°C	-40°C	-40°C	-40°C	-40°C	-40°C	-40°C
Operating Temperature (Max)	150°C (TJ)	105°C (TA)	85°C (TA)	150°C (TJ)	125°C (TJ)	150°C (TJ)	125°C (TA)	85°C (TA)
Package / Case	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC	12-BESOP	SOT-23-8	8-SOIC (7 Leads)	8-SOIC	SOT-23-6
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant
MSL	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Tier 1 - Direct Functional Equivalent: AL8822SP-13 (Diodes Incorporated) is the primary substitute. This part maintains identical topology (Step-Up Boost), supply voltage range (5V–36V), output current (2A), switching frequency (1MHz), and package configuration (8-SOIC Exposed Pad). The part is Active status with ROHS3 compliance and equivalent MSL rating. The primary difference is operating temperature maximum of 105°C (TA) versus 150°C (TJ) on the original part. This substitute is suitable for applications where the thermal environment does not exceed 105°C ambient temperature.

Tier 2 - Multi-Topology Alternatives: CPC9909NTR (IXYS) and MP4054AGJ-P (Monolithic Power Systems) support both Step-Down (Buck) and Step-Up (Boost) topologies with PWM dimming. These parts accommodate offline LED driver designs with topology flexibility. CPC9909NTR operates across 8V–550V supply range with 30kHz–120kHz frequency and is suitable for high-voltage applications. MP4054AGJ-P operates across 12V–28V with 5kHz frequency and is optimized for lower voltage lighting applications. Both are Active status with ROHS3 compliance.

Tier 3 - Isolated Topology Solutions: LYT2004K-TL and LYT2005K-TL (Power Integrations) employ Flyback topology with output isolation, 85kHz switching frequency, and 12-BESOP package. These parts support 10W and 12W power levels respectively and operate across -40°C to 150°C (TJ). These solutions are appropriate for applications requiring galvanic isolation between input and output.

Tier 4 - Specialized Configurations: NCL30060B2DR2G (Fairchild) and NCL30082DDR2G (onsemi) provide Flyback or multi-topology support with Analog and PWM dimming options. NCL30082DDR2G offers dual dimming capability (Analog, PWM) and is Active status with ROHS3 compliance. RT8487GJ6 (Richtek) provides Step-Down (Buck) topology in SOT-23-6 package for compact designs with 10V–30V supply range.

All substitute parts maintain ROHS3 compliance and are Active status except the original AL8821SP-13 (Obsolete). Selection should prioritize topology alignment, supply voltage compatibility, and thermal operating range requirements specific to the target application.

Frequently Asked Questions (FAQ)

Q: Can AL8822SP-13 directly replace AL8821SP-13 in all applications? A: AL8822SP-13 is the closest functional equivalent, maintaining identical topology, supply voltage range, output current, and package. The primary consideration is operating temperature: AL8822SP-13 is rated to 105°C (TA) while AL8821SP-13 is rated to 150°C (TJ). Verify that your application's thermal environment does not exceed 105°C ambient temperature. Both parts are 8-SOIC Exposed Pad packages with identical pinout compatibility.

Q: What is the difference between Triac dimming and PWM dimming? A: Triac dimming (AL8821SP-13) uses phase-cut control for AC line dimming, common in traditional lighting circuits. PWM dimming (CPC9909NTR, MP4054AGJ-P, NCL30082DDR2G) uses pulse-width modulation for DC-side dimming control. The choice depends on your circuit architecture and dimming interface requirements. Triac-capable parts are limited; PWM alternatives provide broader availability.

Q: Can I use a Flyback topology part (LYT2004K-TL, NCL30060B2DR2G) instead of a Boost topology part? A: Flyback topology provides galvanic isolation and different power transfer characteristics compared to Boost topology. While both are offline switchers, they require different transformer designs and control circuits. Substitution is not direct without circuit redesign. Use Flyback alternatives only if isolation is required or if your design can accommodate topology changes.

Q: What does "AC DC Offline Switcher" mean? A: An AC DC Offline Switcher is a power conversion IC that operates directly from AC mains voltage (typically 85V–265V) without a traditional transformer-based power supply. These parts integrate switching control and often include internal power switches for efficient LED driver applications.

Q: Are all substitute parts RoHS compliant? A: All listed substitute parts are RoHS compliant (ROHS3 or RoHS Compliant). The original AL8821SP-13 is ROHS3 compliant. Verify specific RoHS certification requirements for your application and region.

Q: What is MSL (Moisture Sensitivity Level) and why does it matter? A: MSL indicates how sensitive a component is to moisture during storage and handling. MSL 1 (Unlimited) means the part can be stored indefinitely without special precautions. MSL 3 (168 Hours) means the part must be used within 168 hours of opening the moisture barrier bag. AL8821SP-13 and several substitutes (AL8822SP-13, NCL30082DDR2G, RT8487GJ6) are MSL 3. Plan inventory and handling accordingly.

Q: Which substitute offers the widest supply voltage range? A: CPC9909NTR (IXYS) supports 8V–550V supply range, significantly wider than AL8821SP-13 (5V–36V). This makes CPC9909NTR suitable for high-voltage offline applications. However, verify that your circuit design can accommodate the different topology and control requirements.

Q: Can I use a part with a different package (e.g., SOT-23-8 instead of 8-SOIC)? A: Different packages have different pinouts and physical dimensions. MP4054AGJ-P uses SOT-23-8 while AL8821SP-13 uses 8-SOIC. Direct PCB substitution is not possible without layout redesign. Verify pinout compatibility and board space availability before selecting a different package.

Q: What is the significance of "Internal Switch(s): Yes" versus "No"? A: Parts with internal switches (AL8821SP-13, AL8822SP-13, LYT2004K-TL) integrate the power switching element on-chip, simplifying circuit design. Parts with internal switches marked "No" (CPC9909NTR, MP4054AGJ-P, NCL30060B2DR2G, NCL30082DDR2G) require external switching components, increasing circuit complexity but offering design flexibility.

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