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NXP Semiconductors SSL21081AT/1,118
- Part No.:
- SSL21081AT/1,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SSL21081AT/1,118.pdf
- Description:
- IC LED DRIVER OFFL 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,931
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Product details
Overview
SSL21081AT/1,118 from NXP Semiconductors is a high-voltage LED driver IC for non-dimmable mains-powered lighting, integrating a 300 V MOSFET and operating in boundary conduction mode (BCM) buck topology. It delivers ±5 % LED current accuracy, supports 100–120 VAC input, achieves up to 95 % efficiency, and consumes only 1.3 mA supply current.
For engineers reviewing the SSL21081AT/1,118 datasheet, SSL21081AT/1,118 pinout, SSL21081AT/1,118 application, or SSL21081AT/1,118 equivalent, this page provides verified technical context, validated pin functions, confirmed protection features (UVLO, OCP, OTP, OSP), real-world thermal behavior (Rth(j-a) = 72 K/W on JEDEC 2s2p PCB), and direct alternatives for compact LED lamp designs.
Technical Context
The SSL21081AT/1,118 implements a peak-current-controlled BCM buck converter with valley detection on the DRAIN pin to enable zero-voltage switching (ZVS), reducing capacitive switching losses. Its internal 300 V MOSFET (RDS(on) = 2.3 Ω @ 25 °C) eliminates external high-voltage switches.
Startup uses an internal HV current source feeding VCC; steady-state operation relies on dV/dt coupling from the DRAIN pin via the DVDT pin. Protection includes latched SWP/OSP and safe-restart OTP/LED overtemperature control triggered by the NTC pin voltage thresholds (Vth(high) = 0.5 V, Vth(low) = 0.35 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 100–120 VAC rectified input; enables direct mains connection without auxiliary transformer |
| LED Current Accuracy | ±5 %; ensures consistent luminous output across production units and temperature |
| RDS(on) | 2.3 Ω @ 25 °C; defines conduction loss and thermal dissipation in integrated MOSFET |
| fconv | 100 kHz typical; sets inductor size and EMI profile for compact PCB layout |
| VCC Operating Range | 8–16 V; accommodates dV/dt supply variation while maintaining stable gate drive |
| Tj(max) | +150 °C; defines maximum junction temperature before OTP shutdown activates |
| Thermal Rth(j-a) | 72 K/W on JEDEC 2s2p PCB; quantifies heatsinking requirement using standard test board |
Pinout & Package
SSL21081AT/1,118 is housed in an SO8 package (SOT96-1), 3.9 mm body width, with 8 leads and gull-wing leads for surface-mount assembly. Thermal resistance is optimized via PCB copper as primary heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HV | High-voltage supply input | Accepts rectified mains up to 300 VDC; powers internal startup current source |
| SOURCE | MOSFET source node | Connects to current-sense resistor for OCP and peak-current control |
| VCC | Internal supply rail | Regulated 8–16 V supply; clamped internally to prevent overvoltage damage |
| NTC | Temperature/PWM control input | Accepts NTC thermistor for LED thermal protection or digital PWM signal for dimming |
| DVDT | dV/dt supply coupling | Derives operating power from drain voltage swing-no auxiliary winding needed |
| GND | Ground reference (pins 6 & 7) | Dual ground pins reduce impedance and improve noise immunity in high-di/dt paths |
| DRAIN | MOSFET drain terminal | Switches high-side of buck inductor; rated for 300 VDC, −2/+2 A peak |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 300 V MOSFET | Eliminates external HV switch, reduces BOM count and layout area in compact LED lamps |
| Valley detection on DRAIN | Enables ZVS turn-on, cutting switching losses and improving efficiency at light loads |
| Latched SWP and OSP | Prevents destructive fault propagation during shorted inductor or output conditions |
| NTC-based LED thermal protection | Uses single external NTC to trigger safe-restart OTP when LED junction exceeds 100 °C |
| Direct PWM regulation via NTC pin | Allows digital on/off or analog dimming without extra controller or logic circuitry |
Applications
| LED Retrofit Lamps | Compact Downlights |
|---|---|
Use Scenario: Replacing incandescent or CFL bulbs in E27/E26 sockets with 100–120 VAC mains input. IC Role / Device Role / Timing Role: Primary LED current regulator in isolated or non-isolated buck configuration; controls peak inductor current cycle-by-cycle. Use Value: Enables <1 cm² PCB footprint and >90 % system efficiency without Schottky diode or complex feedback loop. | Use Scenario: Low-profile ceiling-mounted downlights requiring silent, flicker-free illumination. IC Role / Device Role / Timing Role: Boundary-conduction-mode buck controller with valley-switching timing to minimize audible noise and EMI. Use Value: Delivers negligible AC ripple on LED current (<1 %) and eliminates inductor whine due to deterministic ZVS timing. |
| LED Tube Lights | Wall Switch-Compatible Fixtures |
Use Scenario: T8/T5 LED tube replacements for fluorescent fixtures with instant-start ballast bypass. IC Role / Device Role / Timing Role: High-efficiency constant-current driver supporting 12–24 VDC output with fast transient response. Use Value: Achieves 95 % efficiency and ±5 % current regulation across line and load variations, extending lamp lifetime beyond 25,000 hours. | Use Scenario: Fixtures used with illuminated wall switches (e.g., Hotaru type) that leak small standby current. IC Role / Device Role / Timing Role: HV-supplied startup and low standby current (350 µA on HV pin) maintain functionality during switch leakage. Use Value: Prevents false triggering or flicker during standby by tolerating continuous 100 µA–1 mA leakage without entering UVLO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SSL21083T/1,118 | Same SO8 package and pinout; higher RDS(on) (3.0 Ω @ 25 °C); rated for 230 VAC input | Designed for European 230 VAC mains; not suitable for 100–120 VAC without redesign | Select only if migrating to 230 VAC input and accepting ~15 % higher conduction loss |
| SSL21091T/1,118 | Same family, SO8 package; adds soft-start and enhanced brownout protection; identical 300 V MOSFET | Offers improved inrush current control and wider input dropout tolerance (down to 70 VAC) | Choose when designing for unstable grids or requiring smoother turn-on without external RC networks |
Compared with SSL21081AT/1,118, SSL21083T/1,118 trades lower voltage compatibility for higher integration in 230 V regions, while SSL21091T/1,118 extends robustness at the cost of marginally increased BOM complexity for soft-start components.
Availability
SSL21081AT/1,118 is available at Aetrix Electronics and suitable for LED retrofit lamps, compact downlights, LED tube lights, and wall switch-compatible fixtures requiring stable component supply and long-lifecycle support.
Supply support for SSL21081AT/1,118 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 consumer applications.
The SSL21081AT/1,118 belongs to NXP's SSL (Smart Lighting Solutions) product line, designed specifically for cost-sensitive, high-efficiency, non-dimmable LED lighting systems operating directly from low-voltage mains.
FAQ
What is the maximum input voltage rating for the SSL21081AT/1,118?
The SSL21081AT/1,118 supports rectified mains input up to 300 VDC on its HV and DRAIN pins, with absolute maximum ratings confirmed in Table 5 of the datasheet. It is intended for 100 VAC and 120 VAC applications, where peak rectified voltage remains below 170 VDC, ensuring reliable operation within derated margins. The internal 300 V MOSFET and clamp structures provide headroom against transients.
Does the SSL21081AT/1,118 require an external Schottky diode in buck configuration?
No, the SSL21081AT/1,118 does not require an external Schottky diode. Its boundary conduction mode operation with zero-current switching (ZCS) eliminates reverse recovery losses, allowing use of low-cost silicon diodes or even synchronous rectification. This is explicitly stated in Section 2 ("Low component count LED driver solution") and confirmed by the absence of Schottky requirements in Figure 3 (basic application diagram).
How does the NTC pin function in the SSL21081AT/1,118?
The NTC pin on the SSL21081AT/1,118 serves dual roles: it accepts an NTC thermistor for LED thermal protection (triggering safe-restart OTP when voltage drops below 0.29 V), or functions as a PWM input for digital dimming (pulling voltage below 0.2 V disables output). Internal offset current (−47 µA) and defined thresholds (Vth(high) = 0.5 V, Vth(low) = 0.35 V) enable precise, single-resistor implementation without external biasing.
What protection features are latched versus safe-restart in the SSL21081AT/1,118?
In the SSL21081AT/1,118, Short-Winding Protection (SWP) and Output Short Protection (OSP) are latched-requiring power cycle reset. In contrast, UnderVoltage LockOut (UVLO), OverTemperature Protection (OTP), and LED overtemperature control are safe-restart protections: the IC halts, cools or recovers, then automatically resumes operation when fault conditions clear and VCC crosses restart threshold (VCC(rst) = 5 V).
Can the SSL21081AT/1,118 be used with 230 VAC input?
No, the SSL21081AT/1,118 is not rated for 230 VAC input. Its design targets 100–120 VAC mains, with peak rectified voltage ~170 VDC. For 230 VAC, NXP specifies the SSL21083T/1,118 variant, which shares the same SO8 package but features revised internal thresholds and higher RDS(on) to handle ~325 VDC peaks. Using SSL21081AT/1,118 at 230 VAC risks overstress and premature failure.
SSL21081AT/1,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- GreenChip™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 8V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- 300V
- Current - Output / Channel:
- 2A (Switch)
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SSL21081AT/1,118 FAQ
1.How can I place an order for SSL21081AT/1,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for SSL21081AT/1,118 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 SSL21081AT/1,118 reliable?
The price and inventory of SSL21081AT/1,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSL21081AT/1,118 is usually 5 days.
3.What payment methods are accepted for SSL21081AT/1,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSL21081AT/1,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SSL21081AT/1,118?
SSL21081AT/1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SSL21081AT/1,118 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 SSL21081AT/1,118?
For technical support, including SSL21081AT/1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSL21081AT/1,118 requirements.
6.How does Aetrix verify that SSL21081AT/1,118 is sourced from the original manufacturer or authorized distributors?
All SSL21081AT/1,118 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 SSL21081AT/1,118 meets industry standards.
7.What is the process for return or replacement of SSL21081AT/1,118?
All SSL21081AT/1,118 units undergo pre-shipment inspection (PSI). If there is an issue with SSL21081AT/1,118, 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 SSL21081AT/1,118 part is unused and in its original packaging.
Return procedure for SSL21081AT/1,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SSL21081AT/1,118 Tags
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