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NXP Semiconductors SSL21101T/1,518
- Part No.:
- SSL21101T/1,518
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SSL21101T/1,518.pdf
- Description:
- IC LED DRIVER OFFL SWITCHER 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,923
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Product details
Overview
SSL21101T/1,518 from NXP Semiconductors is a Switch Mode Power Supply (SMPS) driver IC with integrated 700 V high-voltage power switch, designed for non-dimmable AC/DC offline LED lighting in flyback topology. It delivers ±3 % LED current accuracy across mains voltage (100–230 VAC), temperature, and component variation, supports up to 15 W output, and operates without optocoupler via primary-side sensing.
For engineers reviewing the SSL21101T/1,518 datasheet, SSL21101T/1,518 pinout, SSL21101T/1,518 application, or SSL21101T/1,518 equivalent, this page provides verified functional specifications, SO14 package layout, Smart Digital Control (SDC) behavior, thermal protection thresholds, and validated alternative options for retrofit LED lamp design.
Technical Context
The SSL21101T/1,518 implements Discontinuous Conduction Mode (DCM) flyback control using internal digital regulation that adjusts primary peak current (IM) every half-mains cycle based on ILEDREF reference and average LED current measurement. Its dV/dt detection on DRAIN enables valley switching, while Leading-Edge Blanking (LEB) prevents false peak current triggering.
Smart Digital Control (SDC) configures operation via MODE pin voltage to select between low-THD (≤20 %) or low-ripple modes at 50/60 kHz or 100/120 kHz maximum switching frequencies. Internal JFET start-up enables direct connection to rectified mains, and five GND pins provide robust thermal and noise grounding for compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRAIN max | 700 V - Withstands full rectified 230 VAC mains surges without external snubber |
| RDS(on) | 6.8 Ω @ Tj = 25 °C - Enables efficient high-voltage switching with low conduction loss |
| fsw(max) | 126.4 kHz - Supports compact magnetics and small electrolytic capacitors per IEC61000-3-2 |
| LED current accuracy | ±3 % - Maintains stable light output across input voltage, LED VF, coil tolerance, and temperature |
| Power factor | >0.95 - Achieved without external PFC circuitry, reducing BOM count and board space |
| VCC(startup) | 15–19 V - Ensures reliable start-up from rectified mains via integrated JFET before auxiliary winding takes over |
| Tth(otp) | 140 °C - Triggers OverTemperature Protection with 20 °C hysteresis to prevent thermal runaway |
Pinout & Package
SSL21101T/1,518 is housed in SO14 package (SOT108-1): plastic small outline, 14 leads, 3.9 mm body width, with five dedicated GND pins for low-impedance thermal and signal return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | Receives regulated internal supply (4.6–5.2 V); triggers UVLO reset below 9.5 V |
| DRAIN | High-voltage switch drain | Connects to primary winding; withstands 700 V transient; integrates MOSFET |
| RMAIN | Mains voltage sensing | Converts rectified mains to proportional current (300 µA @ 220 VAC) for PF correction |
| GND (pins 3,8,11,12,13) | Ground reference | Five independent ground terminals minimize ground bounce and improve thermal dissipation |
| MODE | Operation mode control | Voltage-selectable: sets THD/ripple trade-off and max fsw (50/60 or 100/120 kHz) |
| NTC | LED temperature monitor | Accepts NTC voltage; enables linear LED current reduction (25 %) or standby (0 %) at threshold |
| ILEDREF | LED current setpoint | Analog reference input; defines target LED current with ±3 % accuracy via internal digital loop |
| SOURCE | Switch source terminal | Connects to external RSOURCE resistor for peak current sensing and short-winding protection |
| DNC | No-connect | Pin 9 must remain unconnected; no internal function or bonding |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side sensing | Eliminates optocoupler and secondary-side feedback components, reducing cost and size |
| Smart Digital Control (SDC) | Enables selectable low-THD (≤20 %) or low-ripple operation without changing hardware |
| Integrated 700 V switch | Removes need for external HV MOSFET, simplifying layout and improving reliability |
| True current source behavior | Delivers constant LED current regardless of mains fluctuation, LED forward voltage drift, or transformer tolerance |
| Comprehensive protection suite | Includes LED open/short, overtemperature (OTP), short-winding, UVLO, and NTC-based thermal foldback |
Applications
| Retrofit LED Bulbs | Downlight Modules |
|---|---|
|
Use Scenario: Compact A19 or GU10 LED replacement lamps operating directly from 100–230 VAC mains. IC Role / Device Role / Timing Role: SMPS controller with integrated HV switch, executing DCM flyback regulation and primary-side current control. Use Value: Enables ≤12 W output in <18 mm diameter form factor with >0.95 PF and ±3 % current stability across ambient temperatures. |
Use Scenario: Recessed ceiling downlights requiring silent, flicker-free illumination with minimal EMI. IC Role / Device Role / Timing Role: Valley-switching DCM controller managing transformer demagnetization timing and dV/dt detection on DRAIN. Use Value: Achieves THD ≤20 % and low LED current ripple using small electrolytic capacitors, meeting IEC61000-3-2 Class C. |
| Retail Display Lighting | Wall-Switch Compatible Lamps |
|
Use Scenario: Linear LED strips or accent lighting in commercial retail environments with strict thermal constraints. IC Role / Device Role / Timing Role: Thermal management controller using NTC input to linearly reduce LED current above 80 °C before entering standby. Use Value: Prevents LED lumen depreciation and color shift by maintaining junction temperature below 125 °C under continuous operation. |
Use Scenario: Mains-powered LED lamps used with illuminated wall switches that leak current during standby. IC Role / Device Role / Timing Role: Low-quiescent UVLO and JFET start-up circuit enabling reliable restart after micro-power standby state. Use Value: Eliminates ghost illumination or flicker when paired with switches containing neon/LED indicators (<300 µA leakage). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC/DC offline LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SSL21102T/1,518 | Same SO14 package and pinout; adds dimmability support via trailing-edge phase-cut interface | Required where TRIAC or ELV dimming is needed; higher BOM cost due to additional RC network | Select SSL21102T/1,518 only if dimming functionality is mandatory; otherwise SSL21101T/1,518 offers lower system cost and simpler layout |
| UCC28810DR | TI device in SOIC-8; lacks integrated HV switch - requires external 600 V MOSFET; no NTC thermal foldback | Better suited for higher-power (>20 W) designs where discrete switch selection is preferred | Choose UCC28810DR when designing >15 W outputs or requiring flexible MOSFET selection; SSL21101T/1,518 is optimal for cost-sensitive ≤15 W retrofit lamps |
Compared with SSL21102T/1,518, the SSL21101T/1,518 reduces component count and eliminates dimming-related EMI risks; versus UCC28810DR, it lowers total solution size and enables thermal foldback without external circuitry - making it ideal for compact, thermally constrained LED lamp designs.
Availability
SSL21101T/1,518 is available at Aetrix Electronics and suitable for retrofit LED bulbs, downlight modules, retail display lighting, and wall-switch compatible lamps requiring stable component supply and long-lifecycle support.
Supply support for SSL21101T/1,518 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SSL21101T/1,518 belongs to NXP's GreenChip LED driver family, engineered specifically for compact, high-efficiency, non-dimmable AC/DC LED lighting in retrofit and module applications.
FAQ
What is the maximum output power supported by SSL21101T/1,518?
The SSL21101T/1,518 is validated for up to 15 W output in downlight and LED string applications, and up to 12 W in compact retrofit bulbs. Its 700 V DRAIN rating, 1.2 A peak drain current, and thermal characteristics (Rth(j-a) = 70 K/W) constrain practical power delivery to these levels in SO14 packages with standard PCB copper area.
Does SSL21101T/1,518 require an optocoupler for feedback?
No, the SSL21101T/1,518 uses primary-side sensing to regulate LED current without an optocoupler. It derives output current information from the primary winding waveform and ILEDREF reference voltage, eliminating secondary-side feedback components and reducing BOM count and board space.
How does the MODE pin affect SSL21101T/1,518 operation?
The MODE pin voltage selects between low-THD (≤20 %) and low-ripple modes, and determines maximum switching frequency (50/60 kHz or 100/120 kHz). For example, applying 4.5 V to MODE on a 5 V VDD(INTREGD) sets low-THD mode at 100 kHz - optimizing harmonic performance for IEC61000-3-2 compliance.
What protections are built into SSL21101T/1,518?
The SSL21101T/1,518 integrates short-winding protection, internal OverTemperature Protection (OTP) at 140 °C, LED short/open detection, UnderVoltage LockOut (UVLO), and external NTC-based thermal foldback. Each protection triggers automatic shutdown and requires power-cycle reset - ensuring robust field reliability in enclosed lamp housings.
Can SSL21101T/1,518 operate with 100 VAC input?
Yes, the SSL21101T/1,518 supports universal AC input from 100 VAC to 230 VAC. Its RMAIN pin senses real-time mains voltage and adapts control parameters accordingly, maintaining >0.95 power factor and ±3 % LED current accuracy across this full range without hardware changes.
SSL21101T/1,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- GreenChip™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- AC DC Offline Switcher
- Topology:
- Flyback
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 13V
- Voltage - Supply (Max):
- 25.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 51.2kHz ~ 122.9kHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SSL21101T/1,518 FAQ
1.How can I place an order for SSL21101T/1,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for SSL21101T/1,518 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SSL21101T/1,518 reliable?
The price and inventory of SSL21101T/1,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSL21101T/1,518 is usually 5 days.
3.What payment methods are accepted for SSL21101T/1,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSL21101T/1,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SSL21101T/1,518?
SSL21101T/1,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SSL21101T/1,518 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SSL21101T/1,518?
For technical support, including SSL21101T/1,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSL21101T/1,518 requirements.
6.How does Aetrix verify that SSL21101T/1,518 is sourced from the original manufacturer or authorized distributors?
All SSL21101T/1,518 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SSL21101T/1,518 meets industry standards.
7.What is the process for return or replacement of SSL21101T/1,518?
All SSL21101T/1,518 units undergo pre-shipment inspection (PSI). If there is an issue with SSL21101T/1,518, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SSL21101T/1,518 part is unused and in its original packaging.
Return procedure for SSL21101T/1,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SSL21101T/1,518 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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