AL1663RS-13 Equivalent & Substitute Parts

Part Overview

The AL1663RS-13 is an LED Driver IC manufactured by Diodes Incorporated, designed for AC DC offline switching applications with support for multiple topologies including Flyback, Step-Down (Buck), and Step-Up (Boost) configurations. This device features 1 output channel with analog and PWM dimming capabilities, operating across a 7V to 30V supply range with a 20V output specification. The part is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device is packaged in 8-SOIC format with ROHS3 compliance and unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Manufacturer Part Number	AL1663RS-13
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Flyback, Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1
Voltage - Supply (Min)	7V
Voltage - Supply (Max)	30V
Voltage - Output	20V
Frequency	150kHz
Dimming	Analog, PWM
Operating Temperature	-40°C ~ 105°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AL1663RS-13 is determined by the following critical parameters:

Primary Substitution Criteria:

AC DC Offline Switcher topology classification
Single output channel configuration
Supply voltage range compatibility (minimum 7V, maximum 30V)
Dimming capability (Analog and/or PWM support)
8-SOIC package format
ROHS3 compliance and unlimited MSL rating

Secondary Compatibility Factors:

Operating temperature range (-40°C minimum, 105°C maximum preferred)
Flyback, Buck, or Boost topology support
LED lighting and backlight applications
Surface mount mounting type

Substitute parts are grouped based on topology alignment and voltage specification overlap. Parts with identical package formats and dimming capabilities are considered direct functional equivalents. Parts with different package formats or topologies are listed as alternative solutions for specific application requirements.

Parameter Comparison

Parameter	AL1663RS-13	AL1665S-13	HV9931LG-G	TPS92075DR/NOPB	LYT3325D-TL	LYT3328D-TL
Manufacturer	Diodes Inc.	Diodes Inc.	Microchip	Texas Instruments	Power Integrations	Power Integrations
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
Topology	Flyback, Buck, Boost	Flyback, Buck, Boost	Buck, Boost	Buck, Boost	Flyback, Buck, Boost	Flyback, Buck, Boost
Number of Outputs	1	1	1	1	1	1
Voltage - Supply (Min)	7V	8.5V	8V	11V	85VAC	85VAC
Voltage - Supply (Max)	30V	21.8V	450V	18V	132VAC	132VAC
Voltage - Output	20V	-	-	-	-	-
Frequency	150kHz	150kHz	100kHz	-	40kHz ~ 124kHz	40kHz ~ 124kHz
Dimming	Analog, PWM	Analog, PWM	PWM	Triac	Triac	Triac
Operating Temperature	-40°C ~ 105°C (TA)	-40°C ~ 105°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	16-SOIC	16-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Direct Package-Compatible Substitutes (8-SOIC Format):

AL1665S-13 from Diodes Incorporated is the primary recommended substitute. It maintains identical package format, topology support (Flyback, Buck, Boost), and dimming capabilities (Analog, PWM) with Active product status. Supply voltage range is 8.5V to 21.8V, which overlaps the critical operating window of the AL1663RS-13. Both devices carry ROHS3 compliance and unlimited MSL ratings, ensuring equivalent environmental performance.

HV9931LG-G from Microchip Technology provides an alternative 8-SOIC solution with extended supply voltage range (8V to 450V) and Active status. This device supports Buck and Boost topologies with PWM dimming. The wider voltage specification accommodates broader application requirements, though it lacks Flyback topology support present in the original design.

TPS92075DR/NOPB from Texas Instruments offers an 8-SOIC package with Buck and Boost topologies and Triac dimming capability. Supply voltage range is 11V to 18V, which is narrower than the original specification. This device is suitable for applications where Triac dimming is required and supply voltage remains within the specified range.

Alternative Package Solutions (16-SOIC Format):

LYT3325D-TL and LYT3328D-TL from Power Integrations represent the LYTSwitch-3 series with 16-SOIC packaging. Both devices support Flyback, Buck, and Boost topologies with Triac dimming and operate across 85VAC to 132VAC supply range. These parts feature integrated internal switches and extended operating temperature range (-40°C to 150°C). The larger package format accommodates additional functionality and higher integration levels.

Additional Substitute Options:

LM3444MMX/NOPB (National Semiconductor, 10-VSSOP) supports Step-Down topology with Analog dimming and narrower voltage range (8V to 13V), suitable for specific buck-only applications.

LM3447MTE/NOPB (Texas Instruments, 14-TSSOP) provides Flyback topology with Triac dimming and 7.5V to 17.5V supply range.

MP4653GY (Monolithic Power Systems, 20-SOIC) supports Half-Bridge topology with Analog and PWM dimming across 9V to 30V supply range.

NCL30030B2DR2G (onsemi, 16-SOIC) provides Flyback topology with 9V to 30V supply range and Active status.

All substitute parts maintain ROHS3 compliance and are classified as Active products, ensuring long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can AL1665S-13 be used as a direct replacement for AL1663RS-13?

A: AL1665S-13 is the closest functional equivalent. Both are manufactured by Diodes Incorporated in 8-SOIC packages with identical topology support (Flyback, Buck, Boost) and dimming capabilities (Analog, PWM). The supply voltage range differs slightly (8.5V to 21.8V versus 7V to 30V), but the overlap covers standard operating conditions. Both devices carry ROHS3 compliance and unlimited MSL ratings. Verify that your specific application supply voltage falls within the 8.5V to 21.8V window before implementation.

Q: What is the difference between Analog and PWM dimming in these LED driver ICs?

A: Analog dimming adjusts LED brightness by varying the output current level, while PWM (Pulse Width Modulation) dimming controls brightness by switching the output on and off at varying duty cycles. The AL1663RS-13 supports both methods. Substitute parts may support one or both dimming types. Select a substitute that matches your dimming control architecture requirements.

Q: Why do some substitutes have different package formats?

A: The AL1663RS-13 uses an 8-SOIC package. Substitutes like LYT3325D-TL and LYT3328D-TL use 16-SOIC packages to accommodate additional integrated functionality, such as internal power switches and enhanced control circuitry. Larger packages provide more pins for additional features but require PCB layout modifications. Select package format based on your circuit board design constraints and required feature set.

Q: Are all substitute parts ROHS3 compliant?

A: AL1665S-13, HV9931LG-G, TPS92075DR/NOPB, LM3444MMX/NOPB, and LM3447MTE/NOPB are ROHS3 compliant. LYT3325D-TL and LYT3328D-TL carry RoHS compliance (not specifically ROHS3). All parts are REACH Unaffected. Verify compliance requirements for your specific application and regulatory jurisdiction.

Q: What does MSL (Moisture Sensitivity Level) rating mean for component selection?

A: MSL rating indicates how long a component can be exposed to moisture before soldering. AL1663RS-13 has MSL 1 (Unlimited), meaning no time restrictions. LYT3325D-TL and LYT3328D-TL have MSL 3 (168 Hours), requiring storage in dry conditions and limiting shelf life after moisture exposure. Select parts with MSL 1 for applications with extended storage or high-humidity environments.

Q: Can I use HV9931LG-G in place of AL1663RS-13 if my application only requires Buck and Boost topologies?

A: Yes, if your circuit design uses only Buck or Boost topologies and your supply voltage remains within 8V to 450V range. HV9931LG-G lacks Flyback topology support, so it is unsuitable for Flyback-based designs. Verify that your PCB layout and control circuitry are compatible with PWM dimming, as this device does not support Analog dimming.

Q: What supply voltage range should I verify before selecting a substitute?

A: The AL1663RS-13 operates from 7V to 30V. AL1665S-13 operates from 8.5V to 21.8V, creating a narrower window. HV9931LG-G supports 8V to 450V, providing extended range. TPS92075DR/NOPB operates from 11V to 18V, the most restrictive range. Confirm your application's minimum and maximum supply voltage falls within the substitute part's specified range before selection.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. AL1663RS-13 is Obsolete with 32,200 units in stock. AL1665S-13 is Active with 17,643 units available. HV9931LG-G has 8,532 units in stock. LYT3328D-TL has the highest inventory at 55,300 units. For long-term production, prioritize Active status parts with higher inventory levels to ensure supply chain continuity.

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