AL1672-40CSP-13 Equivalent & Substitute Parts

Part Overview

The AL1672-40CSP-13 is an LED Driver IC manufactured by Diodes Incorporated, designed as a 1-output AC DC offline switcher with buck topology and PWM dimming capability. This part operates at 4A output current with a supply voltage range of 7V to 30V and switching frequency between 120kHz and 230kHz. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and new application development where similar functionality is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	AL1672-40CSP-13
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Buck
Number of Outputs	1
Voltage - Supply (Min)	7V
Voltage - Supply (Max)	30V
Current - Output / Channel	4A
Frequency	120kHz ~ 230kHz
Dimming	Analog, PWM
Operating Temperature	-40°C ~ 105°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AL1672-40CSP-13 is determined by the following critical parameters:

Type & Topology: AC DC offline switcher with buck topology for step-down voltage conversion
Output Configuration: Single output LED driver
Dimming Capability: PWM and/or analog dimming support
Supply Voltage Range: Compatibility with 7V to 30V input
Output Current: 4A capability
Switching Frequency: Operation in the 120kHz to 230kHz range
Package Compatibility: Surface mount 8-pin or equivalent configurations
Compliance: ROHS3 compliance and industrial temperature range support

Substitute parts are grouped based on topology alignment (buck, flyback, or multi-topology), dimming method compatibility (PWM, analog, or triac), and electrical parameter overlap with the main part's operating specifications.

Parameter Comparison

Parameter	AL1672-40CSP-13	HVLED815PFTR	LNK410LG	LYT1403D-TL	LYT3324D-TL	MP4001DS-LF	RT8458GJ6	TPS92210DR
Manufacturer	Diodes Inc.	STMicroelectronics	Power Integrations	Power Integrations	Power Integrations	Monolithic Power Systems	Richtek USA	Texas Instruments
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	Buck	Flyback	Flyback	Step-Down (Buck)	Flyback, Buck, Boost	Step-Down (Buck)	Step-Down (Buck)	Flyback
Number of Outputs	1	1	1	1	1	1	1	1
Voltage - Supply (Min)	7V	11.5V	36V	90VAC	85VAC	12V	17V	9V
Voltage - Supply (Max)	30V	23V	725V	308VAC	132VAC	450V	32V	20V
Current - Output / Channel	4A	—	4.9A	—	—	—	—	—
Frequency	120kHz ~ 230kHz	166kHz	66kHz	20kHz	40kHz ~ 124kHz	110kHz	47kHz	—
Dimming	Analog, PWM	PWM	Triac	—	Triac	PWM	Analog	Triac
Operating Temperature	-40°C ~ 105°C (TA)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TA)
Package / Case	8-SOIC Exposed Pad	16-SOIC	7-SSIP, Through Hole	8-SOIC	16-SOIC	8-SOIC	SOT-23-6	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes for Buck Topology with PWM Dimming:

MP4001DS-LF and RT8458GJ6 maintain buck topology with PWM or analog dimming capability. MP4001DS-LF operates across 12V to 450V supply range with 110kHz switching frequency and PWM dimming, suitable for applications requiring higher input voltage tolerance. RT8458GJ6 operates at 17V to 32V with analog dimming and 47kHz frequency, appropriate for lower voltage applications with analog control requirements. Both are active products with ROHS3 compliance.

Alternative Topologies with Extended Voltage Range:

LYT1403D-TL and LYT3324D-TL from Power Integrations offer buck topology with AC input compatibility (90VAC to 308VAC and 85VAC to 132VAC respectively). LYT1403D-TL provides step-down conversion at 20kHz, while LYT3324D-TL supports multiple topologies (flyback, buck, boost) with triac dimming at 40kHz to 124kHz. Both are active products with RoHS compliance and extended temperature ranges to 150°C.

Flyback Topology Alternatives:

HVLED815PFTR (STMicroelectronics) and TPS92210DR (Texas Instruments) employ flyback topology with PWM and triac dimming respectively. HVLED815PFTR operates at 11.5V to 23V with 166kHz frequency and internal switch, suitable for compact designs. TPS92210DR operates at 9V to 20V with triac dimming and 8-SOIC package, maintaining form factor compatibility with the original part.

Extended Range Option:

LNK410LG (Power Integrations) provides the widest supply voltage range (36V to 725V) with 4.9A output current, flyback topology, and triac dimming. This part is suitable for high-voltage applications but requires through-hole mounting (eSIP-7F package) rather than surface mount.

All recommended substitutes maintain active product status, ensuring long-term availability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can I directly replace AL1672-40CSP-13 with any of these substitutes?

A: Direct replacement depends on your application's specific requirements. The AL1672-40CSP-13 uses buck topology with PWM and analog dimming. MP4001DS-LF and RT8458GJ6 maintain this topology and dimming capability. Other substitutes employ different topologies (flyback) or dimming methods (triac), requiring circuit redesign and validation.

Q: What is the difference between PWM and triac dimming?

A: PWM dimming modulates the duty cycle of the switching signal for brightness control. Triac dimming uses phase-cut control compatible with standard wall dimmers. The AL1672-40CSP-13 supports both PWM and analog dimming. Substitutes with triac-only dimming (LNK410LG, TPS92210DR, LYT3324D-TL) require different dimming circuit implementation.

Q: Are package differences significant?

A: Yes. The AL1672-40CSP-13 uses 8-SOIC surface mount with exposed pad. MP4001DS-LF, RT8458GJ6, and TPS92210DR maintain 8-SOIC compatibility. LYT1403D-TL and HVLED815PFTR use 16-SOIC packages requiring PCB layout modification. LNK410LG uses through-hole eSIP-7F, incompatible with surface mount designs.

Q: Which substitute offers the closest electrical match?

A: MP4001DS-LF provides the closest match: buck topology, PWM dimming, 8-SOIC package, and active product status. It operates across 12V to 450V supply range, exceeding the original 7V to 30V specification, and maintains 110kHz switching frequency within the original 120kHz to 230kHz range.

Q: Do all substitutes meet RoHS compliance?

A: Yes. All listed substitutes are RoHS compliant (either ROHS3 or RoHS). The AL1672-40CSP-13 is ROHS3 compliant, and all active substitutes maintain equivalent or higher compliance levels.

Q: What is the temperature rating difference between TA and TJ?

A: TA (ambient temperature) refers to the surrounding air temperature. TJ (junction temperature) refers to the semiconductor die temperature. The AL1672-40CSP-13 specifies -40°C to 105°C TA. Most substitutes specify -40°C to 125°C or 150°C TJ, indicating higher thermal capability but requiring thermal management analysis for equivalent performance.

Q: Can I use LYT1403D-TL or LYT3324D-TL as direct replacements?

A: These parts require AC input voltage (90VAC to 308VAC and 85VAC to 132VAC respectively), whereas the AL1672-40CSP-13 accepts DC input (7V to 30V). They are suitable only for applications with AC mains input and require complete circuit redesign.

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