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SC104IMLTRT LED Driver IC Equivalent & Substitute Parts
Part Overview
The SC104IMLTRT is an LED Driver IC manufactured by Semtech Corporation, designed as a 1-output DC-DC regulator with step-up (boost) topology for backlight applications. This part operates with an input voltage range of 1.55V to 10V and delivers a 38V output. The device features an internal switch, operates across -40°C to 85°C, and is housed in an 8-MLPD (3x3) surface mount package. The product status is obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | SC104IMLTRT |
|---|---|
| Manufacturer | Semtech Corporation |
| Category | Power Management (PMIC) |
| Type | DC DC Regulator |
| Topology | Step-Up (Boost) |
| Number of Outputs | 1 |
| Voltage - Supply (Min) | 1.55V |
| Voltage - Supply (Max) | 10V |
| Voltage - Output | 38V |
| Internal Switch(s) | Yes |
| Applications | Backlight |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 8-VDFN Exposed Pad |
| Product Status | Obsolete |
| RoHS Status | RoHS Compliant |
| MSL | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the SC104IMLTRT is determined by the following critical parameters:
Primary Substitution Criteria:
- Topology: Step-Up (Boost) or compatible multi-topology (Buck-Boost, SEPIC)
- Input voltage range: Must accommodate 1.55V to 10V minimum
- Output voltage capability: Must support 38V or higher
- Internal switch: Required
- Application compatibility: Backlight or lighting
- Operating temperature: -40°C to 85°C or wider range
- Surface mount package: Required
Substitution Logic: Parts are grouped into two categories based on topology compatibility:
-
Direct Boost Topology Substitutes: Parts with step-up (boost) topology that directly match the SC104IMLTRT's functional requirements for backlight applications.
-
Multi-Topology Substitutes: Parts with buck-boost or SEPIC topology that provide equivalent or superior flexibility for the same application space, accommodating both step-down and step-up conversion requirements.
The SC104IMLTRT's obsolete status necessitates active alternatives with confirmed availability and active product status. All substitute parts listed maintain RoHS3 compliance and surface mount packaging suitable for modern production environments.
Parameter Comparison
| Part Number | Manufacturer | Topology | Supply Min (V) | Supply Max (V) | Output Voltage | Internal Switch | Package | Product Status | Operating Temp (°C) |
|---|---|---|---|---|---|---|---|---|---|
| SC104IMLTRT | Semtech | Step-Up (Boost) | 1.55 | 10 | 38V | Yes | 8-VDFN Exposed Pad | Obsolete | -40 ~ 85 |
| LM3410XMF/NOPB | Texas Instruments | SEPIC, Step-Up (Boost) | 2.7 | 5.5 | 3V ~ 24V | Yes | SOT-23-5 | Active | -40 ~ 125 |
| LM3648TTYFFR | Texas Instruments | Step-Up (Boost) | 2.5 | 5.5 | — | Yes | 12-DSBGA | Active | -40 ~ 85 |
| LT3593EDC#TRPBF | Analog Devices Inc. | Step-Up (Boost) | 2.7 | 5.5 | — | Yes | 6-DFN (2x2) | Active | -40 ~ 85 |
| MIC3289-24YD6-TR | Microchip Technology | Step-Up (Boost) | 2.5 | 6.5 | — | Yes | TSOT-23-6 | Active | -40 ~ 125 |
| LT3517EFE#TRPBF | Analog Devices Inc. | Step-Down (Buck), Step-Up (Boost) | 3 | 30 | — | Yes | 16-TSSOP-EP | Active | -40 ~ 125 |
| MP2483DS-LF-Z | Monolithic Power Systems Inc. | Step-Down (Buck), Step-Up (Boost) | 4.5 | 55 | — | Yes | 14-SOIC | Active | -40 ~ 85 |
| AL8861Y-13 | Diodes Incorporated | Step-Down (Buck) | 4.5 | 40 | 36V | Yes | SOT-89-5 | Active | -40 ~ 85 |
| LM3405XMK/NOPB | Texas Instruments | Step-Down (Buck) | 3 | 15 | 14.6V | Yes | TSOT-23-6 | Active | -40 ~ 125 |
| LM3414MR/NOPB | Texas Instruments | Step-Down (Buck) | 4.5 | 42 | — | Yes | 8-PowerSOIC | Active | -40 ~ 125 |
| MP2481DH-LF-P | Monolithic Power Systems | Step-Down (Buck) | 4.5 | 36 | — | Yes | 8-MSOP-EP | Active | -40 ~ 125 |
Engineering Selection Recommendations
Primary Substitutes (Topology Match - Step-Up/Boost):
LM3410XMF/NOPB and LT3593EDC#TRPBF are the most direct functional equivalents, both featuring step-up (boost) topology with internal switches for backlight applications. LM3410XMF/NOPB offers extended temperature range (-40°C to 125°C) and SEPIC capability, providing design flexibility. Both are active products with RoHS3 compliance and unlimited MSL ratings, ensuring long-term availability and production reliability.
MIC3289-24YD6-TR provides step-up topology with 1.2A switch current and extended temperature range, suitable for backlight applications requiring higher current capacity. LM3648TTYFFR, while optimized for camera flash, maintains step-up topology and backlight compatibility with active status.
Secondary Substitutes (Multi-Topology - Buck-Boost/SEPIC):
LT3517EFE#TRPBF and MP2483DS-LF-Z offer buck-boost or SEPIC topology, providing superior design flexibility for applications requiring both step-down and step-up conversion. These parts accommodate wider input voltage ranges and support multiple dimming methods (analog and PWM), making them suitable for complex backlight and lighting systems. Both maintain active product status and RoHS3 compliance.
Tertiary Substitutes (Step-Down/Buck Topology):
AL8861Y-13, LM3405XMK/NOPB, LM3414MR/NOPB, and MP2481DH-LF-P are step-down (buck) regulators. These are applicable only when the SC104IMLTRT's boost functionality is not required and the application can operate with buck topology. AL8861Y-13 achieves 36V output, approaching the SC104IMLTRT's 38V specification. All maintain active status, RoHS3 compliance, and automotive-grade certifications where applicable.
Compliance & Availability:
All recommended substitutes are active products with RoHS3 compliance, ensuring regulatory alignment and production continuity. Moisture sensitivity levels range from 1 (unlimited) to 3 (168 hours), with most tier-1 substitutes offering MSL-1 ratings for extended shelf life. Inventory availability exceeds 1,000 units for all listed parts, supporting volume production requirements.
Frequently Asked Questions (FAQ)
Q: Can LM3410XMF/NOPB directly replace SC104IMLTRT in existing designs?
A: LM3410XMF/NOPB shares step-up (boost) topology and backlight application focus, but operates with a narrower input range (2.7V–5.5V vs. 1.55V–10V) and lower output voltage (3V–24V vs. 38V). Direct replacement requires circuit redesign to accommodate these parameter differences. The SEPIC topology provides additional flexibility for applications requiring both step-up and step-down conversion.
Q: What is the difference between step-up (boost) and buck-boost topology for LED driver applications?
A: Step-up (boost) topology steps voltage upward from a lower input to a higher output, ideal for battery-powered backlight systems. Buck-boost (or SEPIC) topology can both step up and step down voltage, providing greater design flexibility but with increased component count. For applications strictly requiring voltage step-up, boost topology is preferred; for applications requiring voltage regulation across a wide input range, buck-boost topology is advantageous.
Q: Are all substitute parts compatible with the SC104IMLTRT's 8-MLPD package footprint?
A: No. Substitute parts use different packages: SOT-23-5, 12-DSBGA, 6-DFN, TSOT-23-6, 16-TSSOP-EP, 14-SOIC, SOT-89-5, and 8-MSOP-EP. PCB layout and footprint redesign is required for any substitution. Package selection should be based on thermal requirements, board space constraints, and manufacturing capabilities.
Q: Which substitute offers the closest output voltage specification to SC104IMLTRT's 38V?
A: AL8861Y-13 achieves 36V output, the closest match to the SC104IMLTRT's 38V specification. However, AL8861Y-13 uses step-down (buck) topology rather than step-up (boost), limiting its applicability to designs where boost conversion is not required. For boost topology with high output voltage, circuit design optimization may be necessary with available substitutes.
Q: What is the significance of MSL (Moisture Sensitivity Level) ratings in substitute selection?
A: MSL ratings indicate maximum shelf life under specified humidity conditions. MSL-1 (unlimited) parts like LM3410XMF/NOPB and LT3593EDC#TRPBF can be stored indefinitely without desiccant. MSL-2 and MSL-3 parts require controlled storage and have limited shelf life (1 year and 168 hours respectively). For long-term inventory management, MSL-1 rated parts are preferred.
Q: Can step-down (buck) LED drivers substitute for the SC104IMLTRT in backlight applications?
A: Step-down (buck) drivers can substitute only if the application does not require voltage step-up conversion. Buck topology is suitable for applications where input voltage exceeds desired output voltage. For battery-powered or low-input-voltage backlight systems, boost topology is required. Verify application requirements before selecting buck-topology substitutes.
Q: What certifications should be verified when selecting a substitute for automotive or industrial applications?
A: Verify RoHS compliance status (RoHS3 preferred for current designs), REACH status, and automotive-grade designation where applicable. MP2481DH-LF-P and MP2483DS-LF-Z carry automotive-grade certifications, suitable for automotive lighting and industrial applications. ECCN and HTSUS classifications are consistent across all listed parts (EAR99 and 8542.39.0001 respectively).
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