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SC618ULTRT LED Driver IC Equivalent & Substitute Parts
Part Overview
The SC618ULTRT is a Semtech Corporation LED Driver IC designed for camera flash applications, featuring a switched capacitor (charge pump) topology with 500mA flash output capability. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The SC618ULTRT operates from a 3V to 5.25V supply and integrates a single output DC-DC regulator in a compact 10-MLPD-UT (3x3) surface mount package.
Substiute Parts
Key Parameters
| Parameter | SC618ULTRT |
|---|---|
| Manufacturer | Semtech Corporation |
| Product Status | Obsolete |
| Category | Power Management (PMIC) |
| Type | DC DC Regulator |
| Topology | Switched Capacitor (Charge Pump) |
| Number of Outputs | 1 |
| Voltage Supply (Min) | 3V |
| Voltage Supply (Max) | 5.25V |
| Current Output / Channel | 500mA (Flash) |
| Frequency | 250kHz |
| Applications | Camera Flash |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 10-UFDFN Exposed Pad |
| Mounting Type | Surface Mount |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the SC618ULTRT is determined by the following critical parameters:
Topology Match: The SC618ULTRT uses switched capacitor (charge pump) topology. Direct equivalents must employ the same topology to maintain circuit compatibility and performance characteristics.
Supply Voltage Range: Input voltage compatibility spans 3V to 5.25V. Substitute parts must support this range or a compatible subset without exceeding maximum ratings.
Output Current: The 500mA flash output specification defines the minimum current handling requirement. Substitute parts must meet or exceed this rating.
Operating Temperature: The -40°C to 85°C range establishes environmental operating limits. Substitute parts must support this temperature window.
Package Compatibility: The 10-UFDFN Exposed Pad package defines the physical footprint. Substitutes in equivalent packages (10-DFN, 10-WFDFN) maintain PCB layout compatibility.
Application Context: Camera flash operation requires rapid current delivery and efficient energy conversion. Substitutes must support flash or similar high-current pulse applications.
Substitute parts are grouped into two categories:
Category 1 - Direct Topology Match (Switched Capacitor): LM2758TLX/NOPB and LTC3214EDD#PBF maintain the charge pump topology, offering the closest functional equivalence.
Category 2 - Alternative Topology (Buck/Boost Regulators): IS31LT3352-V1GRLS2-TR, ISL78100ARZ-T, LM3402MRX/NOPB, LM3404MR/NOPB, LM3407MY/NOPB, LT3474IFE#PBF, LT3477IFE#PBF, and MIC2292C-15YML-TR provide functional LED driver capability with different topologies, suitable for applications where topology flexibility exists.
Parameter Comparison
| Parameter | SC618ULTRT | LM2758TLX/NOPB | LTC3214EDD#PBF | IS31LT3352-V1GRLS2-TR | ISL78100ARZ-T | LM3402MRX/NOPB | LM3404MR/NOPB | LM3407MY/NOPB | LT3474IFE#PBF | LT3477IFE#PBF | MIC2292C-15YML-TR |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Semtech | National Semiconductor | Analog Devices | Lumissil Microsystems | Renesas Electronics | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices | Microchip Technology |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| Type | DC DC Regulator | DC DC Regulator | DC DC Regulator | DC DC Regulator | DC DC Regulator | DC DC Regulator | DC DC Regulator | DC DC Regulator | DC DC Regulator | DC DC Regulator | DC DC Regulator |
| Topology | Switched Capacitor (Charge Pump) | Switched Capacitor (Charge Pump) | Switched Capacitor (Charge Pump) | Step-Down (Buck) | Step-Down (Buck), Step-Up (Boost) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Step-Down (Buck) | Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost) | Step-Up (Boost) |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage Supply (Min) | 3V | 2.7V | 2.9V | 6V | 2.7V | 6V | 6V | 4.5V | 4.6V | 2.5V | 2.5V |
| Voltage Supply (Max) | 5.25V | 5.5V | 4.5V | 40V | 16V | 42V | 42V | 30V | 36V | 25V | 10V |
| Current Output / Channel | 500mA (Flash) | 700mA | 500mA | 750mA | 1A | 500mA | 1A | 350mA | 1A | 3A (Switch) | 750mA (Switch) |
| Frequency | 250kHz | 1.25MHz | 900kHz | 1MHz | 1MHz | 1MHz | 1MHz | 300kHz ~ 1MHz | 200kHz ~ 2MHz | 200kHz ~ 4.6MHz | 1.6MHz |
| Dimming | — | — | — | Analog, PWM | Analog, PWM | PWM | PWM | PWM | PWM | PWM | Analog, PWM |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 105°C (TA) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TJ) |
| Package / Case | 10-UFDFN Exposed Pad | 12-WFBGA, DSBGA | 10-WFDFN Exposed Pad | 8-SOIC (0.154", 3.90mm Width) | 20-VFQFN Exposed Pad | 8-PowerSOIC (0.154", 3.90mm Width) | 8-PowerSOIC (0.154", 3.90mm Width) | 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm Width) | 16-TSSOP (0.173", 4.40mm Width) Exposed Pad | 20-TSSOP (0.173", 4.40mm Width) Exposed Pad | 8-VFDFN Exposed Pad, 8-MLF® |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | — | — | ROHS3 Compliant | — | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — | 1 (Unlimited) | 3 (168 Hours) | 3 (168 Hours) | 3 (168 Hours) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | — | — | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
Direct Equivalents (Switched Capacitor Topology)
LM2758TLX/NOPB and LTC3214EDD#PBF are the primary substitutes for the SC618ULTRT. Both maintain the switched capacitor (charge pump) topology, ensuring functional and electrical compatibility. LM2758TLX/NOPB offers 700mA output current with a 2.7V to 5.5V supply range and operates at 1.25MHz. LTC3214EDD#PBF provides 500mA output current with a 2.9V to 4.5V supply range and operates at 900kHz. Both parts are active products with established supply chains and are suitable for camera flash and backlight applications. LTC3214EDD#PBF is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements.
Alternative Topology Substitutes (Buck/Boost Regulators)
For applications where topology flexibility is acceptable, alternative LED driver ICs provide enhanced functionality:
IS31LT3352-V1GRLS2-TR (Lumissil Microsystems) uses step-down (buck) topology with 750mA output and supports 6V to 40V input, suitable for higher voltage applications with analog and PWM dimming capability.
ISL78100ARZ-T (Renesas Electronics Corporation) combines step-down and step-up topologies with 1A output, 2.7V to 16V input range, and automotive-grade qualification (AEC-Q100). This part extends the operating temperature to -40°C to 105°C and is suitable for automotive lighting applications.
LM3402MRX/NOPB and LM3404MR/NOPB (Texas Instruments) are step-down regulators with 500mA and 1A output respectively, supporting 6V to 42V input and PWM dimming. Both operate to -40°C to 125°C and are ROHS3 compliant.
LM3407MY/NOPB (Texas Instruments) provides 350mA output with 4.5V to 30V input range, variable frequency operation (300kHz to 1MHz), and PWM dimming. MSL rating of 1 (Unlimited) indicates superior moisture handling.
LT3474IFE#PBF (Analog Devices Inc.) is a step-down regulator with 1A output, 4.6V to 36V input, and automotive-grade qualification. Operating frequency ranges from 200kHz to 2MHz with PWM dimming support.
LT3477IFE#PBF (Analog Devices Inc.) offers the highest flexibility with multiple topology support (Flyback, SEPIC, Buck, Boost), 3A switch current, and 2.5V to 25V input range. Frequency range extends to 4.6MHz.
MIC2292C-15YML-TR (Microchip Technology) is a step-up (boost) regulator with 750mA switch current, 2.5V to 10V input, and 1.6MHz operation. Supports analog and PWM dimming for backlight applications.
All alternative topology substitutes are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs.
Frequently Asked Questions (FAQ)
Q: Can I use LM2758TLX/NOPB as a direct replacement for SC618ULTRT?
A: LM2758TLX/NOPB is functionally equivalent as a switched capacitor LED driver IC. Both use charge pump topology and operate within overlapping supply voltage ranges (SC618ULTRT: 3V–5.25V; LM2758TLX/NOPB: 2.7V–5.5V). LM2758TLX/NOPB provides higher output current (700mA vs. 500mA) and operates at higher frequency (1.25MHz vs. 250kHz). Package differences exist: SC618ULTRT uses 10-MLPD-UT while LM2758TLX/NOPB uses 12-DSBGA. PCB layout redesign is required for package migration.
Q: What is the difference between switched capacitor and buck topology substitutes?
A: Switched capacitor (charge pump) topology uses capacitive energy transfer without inductors, resulting in compact designs suitable for low-power applications like camera flash. Buck (step-down) topology uses inductive energy storage, enabling higher efficiency at higher power levels and wider input voltage ranges. Buck regulators typically require larger external components but offer better performance in high-current applications. For camera flash applications, switched capacitor topology is preferred; buck topology substitutes are suitable only if circuit redesign is acceptable.
Q: Is LTC3214EDD#PBF compatible with the SC618ULTRT application?
A: LTC3214EDD#PBF is a switched capacitor LED driver with identical topology to SC618ULTRT. Both support 500mA output current and operate within compatible temperature ranges (-40°C to 85°C). LTC3214EDD#PBF has a narrower supply range (2.9V–4.5V vs. 3V–5.25V) and higher operating frequency (900kHz vs. 250kHz). Package compatibility requires evaluation: SC618ULTRT uses 10-MLPD-UT; LTC3214EDD#PBF uses 10-DFN (3x3). Both are 10-pin DFN packages with similar footprints, making this a viable substitute with minimal layout changes.
Q: Can I use ISL78100ARZ-T for automotive applications?
A: ISL78100ARZ-T is qualified to AEC-Q100 automotive standards and operates to -40°C to 105°C, exceeding the SC618ULTRT temperature range. This part combines step-down and step-up topologies with 1A output and supports analog and PWM dimming. The 20-QFN (4x4) package differs from SC618ULTRT's 10-MLPD-UT, requiring PCB redesign. ISL78100ARZ-T is suitable for automotive LED driver applications where topology flexibility and higher current capability are required.
Q: What are the MSL (Moisture Sensitivity Level) implications for substitute selection?
A: SC618ULTRT has MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. LTC3214EDD#PBF and LM3407MY/NOPB also have MSL 1, making them direct substitutes from a moisture perspective. Alternative topology parts (IS31LT3352-V1GRLS2-TR, ISL78100ARZ-T, LM3402MRX/NOPB, LM3404MR/NOPB, LT3474IFE#PBF, LT3477IFE#PBF) have MSL 3 (168 Hours), requiring controlled storage conditions and bake-out procedures before reflow soldering. MSL 3 parts are acceptable for production environments with proper moisture management protocols.
Q: Which substitute offers the best regulatory compliance for new designs?
A: LTC3214EDD#PBF, ISL78100ARZ-T, LM3402MRX/NOPB, LM3404MR/NOPB, LM3407MY/NOPB, LT3474IFE#PBF, LT3477IFE#PBF, and MIC2292C-15YML-TR are all ROHS3 compliant and REACH unaffected. These parts meet current environmental and regulatory requirements for commercial and industrial applications. ISL78100ARZ-T additionally carries AEC-Q100 automotive qualification for automotive-grade designs. LM2758TLX/NOPB lacks published RoHS and REACH status in the provided data, requiring verification with the manufacturer for regulatory-sensitive applications.
Q: What package considerations apply when selecting a substitute?
A: SC618ULTRT uses 10-MLPD-UT (3x3) package. LTC3214EDD#PBF uses 10-DFN (3x3), offering the closest physical compatibility with minimal PCB layout changes. LM2758TLX/NOPB uses 12-DSBGA, requiring significant layout redesign. Alternative topology parts use larger packages: IS31LT3352-V1GRLS2-TR (8-SOP), ISL78100ARZ-T (20-QFN), LM3402MRX/NOPB and LM3404MR/NOPB (8-PowerSOIC), LM3407MY/NOPB (8-HVSSOP), LT3474IFE#PBF (16-TSSOP), LT3477IFE#PBF (20-TSSOP), and MIC2292C-15YML-TR (8-MLF). Package selection depends on available PCB real estate and design flexibility.
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