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AL8808WT-7 Equivalent & Substitute Parts
Part Overview
The AL8808WT-7 is an LED Driver IC manufactured by Diodes Incorporated, functioning as a 1-output DC-DC regulator with step-down (buck) topology. This device integrates a 1A internal switch and supports both analog and PWM dimming control at 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 across supply voltage range, output current capability, dimming control methods, and thermal operating specifications.
Substiute Parts
Key Parameters
| Parameter | AL8808WT-7 Specification |
|---|---|
| Manufacturer | Diodes Incorporated |
| Product Status | Obsolete |
| Type | DC DC Regulator |
| Topology | Step-Down (Buck) |
| Number of Outputs | 1 |
| Voltage - Supply (Min) | 6V |
| Voltage - Supply (Max) | 30V |
| Current - Output / Channel | 1A (Switch) |
| Frequency | 1MHz |
| Dimming | Analog, PWM |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Package / Case | SOT-23-5 Thin, TSOT-23-5 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following critical parameters:
Primary Compatibility Criteria:
- Topology: Step-Down (Buck) with internal switch
- Number of Outputs: 1 output configuration
- Current Rating: 1A output current capability
- Dimming Control: Support for Analog and/or PWM dimming
- Supply Voltage Range: Minimum 6V input capability
- Operating Temperature: Support for -40°C to 125°C range
- Package Type: Surface mount with compatible pinout
- Compliance: ROHS3 compliant, REACH unaffected
Substitute parts are grouped into two categories:
Category A - Direct Functional Equivalents (Same Package Family): Parts maintaining SOT-23-5 or TSOT-23-5 package format with matching electrical specifications and dimming capabilities.
Category B - Functional Equivalents (Alternative Packages): Parts with equivalent electrical performance but different package types, requiring PCB layout modification.
Parameter Comparison
| Part Number | Manufacturer | Status | Supply Min (V) | Supply Max (V) | Output Current (A) | Frequency (MHz) | Dimming | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|
| AL8808WT-7 | Diodes Inc. | Obsolete | 6 | 30 | 1 | 1 | Analog, PWM | -40 ~ 125 | TSOT-23-5 |
| AL8860WT-7 | Diodes Inc. | Active | 4.5 | 40 | 1 | 1 | Analog, PWM | -40 ~ 105 | TSOT-23-5 |
| IS31LT3353-STLS4-TR | Lumissil Microsystems | Active | 6 | 40 | 1 | 1 | Analog, PWM | -40 ~ 125 | SOT-23-5 |
| LM3404HVMRX/NOPB | Texas Instruments | Active | 6 | 75 | 1 | 1 | PWM | -40 ~ 125 | 8-SO PowerPad |
| LM3405AXMY/NOPB | Texas Instruments | Active | 3 | 22 | 1 | 1.6 | PWM | -40 ~ 125 | 8-HVSSOP |
| LM3405XMK/NOPB | Texas Instruments | Active | 3 | 15 | 1 | 1.6 | PWM | -40 ~ 125 | TSOT-23-6 |
| LM3406HVMHX/NOPB | Texas Instruments | Active | 6 | 75 | 1.5 | 1 | PWM | -40 ~ 125 | 14-HTSSOP |
| LM3414HVSDX/NOPB | Texas Instruments | Active | 4.5 | 65 | 1 | 0.5 | Analog, PWM | -40 ~ 125 | 8-WSON (3x3) |
| LT3474EFE#PBF | Analog Devices Inc. | Active | 4.6 | 36 | 1 | 2 | PWM | -40 ~ 85 | 16-TSSOP-EP |
| LT3474IFE#PBF | Analog Devices Inc. | Active | 4.6 | 36 | 1 | 2 | PWM | -40 ~ 125 | 16-TSSOP-EP |
| LT3474IFE-1#TRPBF | Analog Devices Inc. | Active | 4.6 | 36 | 1 | 2 | PWM | -40 ~ 125 | 16-TSSOP-EP |
Engineering Selection Recommendations
Tier 1 - Preferred Substitutes (Highest Compatibility):
AL8860WT-7 (Diodes Incorporated) is the primary recommended substitute. It maintains the same manufacturer lineage, identical package format (TSOT-23-5), and equivalent electrical specifications. The part is active with extended supply voltage range (4.5V to 40V) and supports both analog and PWM dimming. Operating temperature range is -40°C to 105°C, which covers the AL8808WT-7 minimum requirement. ROHS3 compliance and MSL-1 rating ensure manufacturing compatibility.
IS31LT3353-STLS4-TR (Lumissil Microsystems) provides functional equivalence with identical supply voltage minimum (6V), 1A output current, and dual dimming support. The part operates across the full -40°C to 125°C temperature range matching the original specification. Package is SOT-23-5 (functionally equivalent to TSOT-23-5). Active product status and ROHS3 compliance support long-term availability.
Tier 2 - Functional Equivalents (Package Modification Required):
LM3414HVSDX/NOPB (Texas Instruments) offers 1A output current with analog and PWM dimming in an 8-WSON package. Supply range of 4.5V to 65V exceeds the original specification. Automotive-grade qualification and active status provide design confidence. PCB layout modification is required due to package change.
LT3474IFE#PBF and LT3474IFE-1#TRPBF (Analog Devices Inc.) deliver 1A output current with PWM dimming across 4.6V to 36V supply range. The -40°C to 125°C operating temperature matches the original part. 16-TSSOP-EP package requires PCB redesign. Active product status and automotive-grade qualification support production continuity.
Parts Not Recommended for Direct Substitution:
LM3405AXMY/NOPB and LM3405XMK/NOPB have reduced maximum supply voltage (22V and 15V respectively), limiting compatibility with the original 30V maximum specification.
LM3406HVMHX/NOPB provides 1.5A output current, exceeding the 1A requirement and introducing unnecessary design complexity.
LT3474EFE#PBF has reduced operating temperature range (-40°C to 85°C), which does not meet the original -40°C to 125°C specification.
Frequently Asked Questions (FAQ)
Q: Can AL8860WT-7 directly replace AL8808WT-7 without PCB modification?
A: Yes. AL8860WT-7 maintains identical TSOT-23-5 package format and pinout compatibility. The part is a direct drop-in replacement from a physical standpoint. Electrical performance is equivalent across the overlapping supply voltage range (6V to 30V). Firmware or application code adjustments may be required if the extended supply range (up to 40V) is utilized.
Q: What is the key difference between AL8808WT-7 and IS31LT3353-STLS4-TR?
A: Both parts are functionally equivalent LED driver ICs with 1A output current and dual dimming support. The primary difference is manufacturer (Diodes vs. Lumissil) and package designation (TSOT-23-5 vs. SOT-23-5). These package designations are functionally interchangeable. IS31LT3353 has higher MSL rating (3 vs. 1), which may affect moisture-sensitive handling procedures during assembly.
Q: Why do some substitutes list only PWM dimming instead of analog and PWM?
A: Analog dimming capability is not universally implemented across all LED driver architectures. Parts supporting PWM-only dimming can still function in applications using PWM control signals. If analog dimming is required for your application, select substitutes explicitly listing "Analog, PWM" support: AL8860WT-7, IS31LT3353-STLS4-TR, or LM3414HVSDX/NOPB.
Q: Can I use LM3406HVMHX/NOPB as a substitute despite higher current rating?
A: LM3406HVMHX/NOPB provides 1.5A output current versus the 1A requirement of AL8808WT-7. While the part is electrically capable, it introduces unnecessary design margin and requires PCB layout modification (14-HTSSOP package). Use this part only if your application requires the additional current capacity or if preferred substitutes are unavailable.
Q: What packaging considerations apply when switching from TSOT-23-5 to alternative packages?
A: TSOT-23-5 and SOT-23-5 packages are physically and electrically compatible (5-pin thin-profile packages). Larger packages such as 8-WSON, 8-HVSSOP, 14-HTSSOP, and 16-TSSOP-EP require PCB footprint redesign, trace routing modifications, and thermal management evaluation. Consult package datasheets for pin assignments and thermal pad specifications before layout changes.
Q: Are all recommended substitutes ROHS3 compliant?
A: Yes. All substitute parts listed in this document maintain ROHS3 compliance and REACH unaffected status, matching the original AL8808WT-7 certification level. This ensures regulatory compliance for production and distribution across regulated markets.
Q: What is the impact of operating temperature range differences?
A: AL8808WT-7 specifies -40°C to 125°C (TJ - junction temperature). AL8860WT-7 specifies -40°C to 105°C (TA - ambient temperature). For applications operating near the upper temperature limit, verify that the substitute part's thermal characteristics support your system's maximum junction temperature under worst-case conditions. LT3474EFE#PBF has a reduced range (-40°C to 85°C) and is not suitable for high-temperature applications.
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