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NXP Semiconductors SSL21081T/1,118
- Part No.:
- SSL21081T/1,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SSL21081T/1,118.pdf
- Description:
- IC LED DRIVER OFFLINE 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,584
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Product details
Overview
SSL21081T/1,118 from NXP Semiconductors is a high-voltage LED driver IC integrating a 300 V MOSFET for non-dimmable mains-powered LED lamps. It operates in boundary conduction mode (BCM) buck configuration, delivers ±5 % LED current accuracy, supports direct PWM current regulation, and achieves up to 95 % efficiency in compact PCB designs targeting 100 V AC and 120 V AC inputs.
For engineers reviewing the SSL21081T/1,118 datasheet, SSL21081T/1,118 pinout, SSL21081T/1,118 application, or SSL21081T/1,118 equivalent, key selection considerations include its integrated 300 V switch, valley-switching operation for reduced capacitive losses, cycle-by-cycle current control for ripple suppression, thermal shutdown with safe-restart behavior, and compatibility with wall switches featuring standby indicator lights.
Technical Context
The SSL21081T/1,118 implements a peak-current-controlled BCM buck converter with valley detection on the DRAIN pin to enable zero-voltage switching, minimizing switching losses. Its internal 300 V MOSFET has RDS(on) = 2.3 Ω at 25 °C and supports up to 2 A drain current.
Startup is enabled by an internal HV current source on the HV pin, followed by dV/dt supply via the DVDT pin using capacitive coupling from the drain node. The IC incorporates dedicated protection logic including latched SWP/OSP and safe-restart OTP/brownout, all managed through SOURCE-pin current sensing and NTC-based thermal feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR(DRAIN) | 300 V - Enables direct connection to rectified 120 V AC mains without external HV FET |
| RDS(on) | 2.3 Ω @ 25 °C - Low conduction loss supports high-efficiency operation in compact thermal layout |
| fconv | 100 kHz - Fixed-frequency boundary-mode operation balances EMI and magnetics size |
| ILED accuracy | ±5 % - Tight current regulation ensures consistent LED brightness and lifetime across units |
| VCC operating range | 8–16 V - Supports flexible auxiliary supply design with internal clamp limiting max voltage to 20 V |
| OTP activation | 170 °C (typ) - Thermal shutdown protects IC and adjacent components during overtemperature events |
| Valley detection ΔVvrec(min) | 20 V - Ensures reliable valley-sensing for ZVS even under varying load and line conditions |
Pinout & Package
SSL21081T/1,118 is housed in an SO8 package (SOT96-1), 3.9 mm body width, with exposed pad not electrically connected. Thermal resistance Rth(j-a) = 72 K/W on JEDEC 2s2p board, enabling passive PCB copper heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HV | High-voltage startup supply | Connects to rectified mains; powers internal current source during startup before dV/dt supply engages |
| SOURCE | Current sense and low-side switch return | Carries switched current; voltage drop sets OCP threshold and enables cycle-by-cycle current control |
| VCC | Internal supply rail | Powered by dV/dt (DVDT), auxiliary winding, or HV startup source; clamped to 20 V max |
| NTC | Thermal/PWM control input | Accepts NTC resistor for LED temperature monitoring or digital signal for PWM dimming/soft-start |
| DVDT | dV/dt supply input | Rectifies drain-node voltage swing to generate VCC supply-eliminates need for auxiliary winding |
| GND | Signal and power ground | Pins 6 and 7 are internally tied; must be low-inductance connection to minimize noise in current sensing |
| DRAIN | High-side MOSFET output | Drives buck inductor; rated for 300 V DC and −0.4 to +300 V transient; supports valley detection |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 300 V MOSFET | Eliminates external HV switch, reducing BOM count and PCB footprint in mains-input LED drivers |
| Valley detection with ZVS | Reduces capacitive switching losses and EMI by triggering switch-on at drain voltage minima |
| Direct PWM current regulation | Enables external digital control of LED output without analog feedback loop redesign |
| Latched SWP/OSP + safe-restart OTP | Prevents catastrophic failure under fault while allowing automatic recovery after thermal cooldown |
| LEB with dual thresholds | Suppresses false OCP/SWP triggers from gate-drive transients (300 ns blanking) and inductor spikes |
Applications
| LED Retrofit Lamps | Compact Downlights |
|---|---|
Use Scenario: Replacing incandescent or CFL bulbs in E27/E26 screw-base fixtures powered directly from 100–120 V AC mains. IC Role / Device Role / Timing Role: Primary LED current controller implementing fixed-output BCM buck conversion with integrated HV switch. Use Value: Enables <15 mm PCB height and <0.5 W standby consumption while maintaining ±5 % LED current accuracy across line variations. | Use Scenario: Integrated LED modules in recessed ceiling downlights requiring high reliability and minimal thermal derating. IC Role / Device Role / Timing Role: Boundary-mode buck controller with valley detection ensuring ZVS across full load range and ambient temperatures. Use Value: Achieves >92 % efficiency at 350 mA output with no external Schottky diode required due to ZCS operation. |
| LED Tube Drivers | Wall-Switch Compatible Fixtures |
Use Scenario: T8/T5 LED tube replacements operating from single-ended or double-ended AC mains input. IC Role / Device Role / Timing Role: Non-dimmable constant-current driver with brownout protection limiting input current when VIN approaches VOUT. Use Value: Prevents overcurrent stress on input fuse and bridge rectifier during low-line conditions via ton(high) = 15 μs limit. | Use Scenario: Luminaires used with illuminated wall switches (e.g., Hotaru type) that leak small current during standby. IC Role / Device Role / Timing Role: HV-startup-capable driver with <400 μA HV standby current enabling reliable turn-on despite leakage paths. Use Value: Eliminates flicker or failure to start caused by insufficient hold-up current in legacy switch installations. |
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) = 3.5 Ω; optimized for lower-cost 100 V AC only | Lower efficiency at 120 V AC; reduced thermal margin in enclosed fixtures | Select when cost sensitivity outweighs efficiency and thermal performance at 120 V AC |
| SSL21091T/1,118 | Same family architecture; adds active X-capacitor discharge; requires external HV FET (no integrated switch) | Supports 230 V AC input; enables Class I safety compliance with discharge functionality | Choose for global dual-voltage designs or where integrated HV switch limits maximum output power |
Compared with SSL21081T/1,118, SSL21083T/1,118 trades efficiency for cost in 100 V AC-only systems, while SSL21091T/1,118 extends voltage range and safety features at the expense of external FET complexity and higher BOM count.
Availability
SSL21081T/1,118 is available at Aetrix Electronics and suitable for LED retrofit lamps, compact downlights, LED tube drivers, and wall-switch compatible fixtures requiring stable component supply and long-lifetime reliability.
Supply support for SSL21081T/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 SSL21081T/1,118 belongs to NXP's SSL (Smart Lighting Solutions) product line, designed specifically for highly integrated, cost-optimized, non-dimmable LED drivers targeting residential and commercial mains-powered lighting.
FAQ
What is the maximum input voltage the SSL21081T/1,118 can handle?
The SSL21081T/1,118 supports rectified 100 V AC and 120 V AC mains inputs. Its integrated 300 V MOSFET and DRAIN pin rating of −0.4 V to +300 V DC allow safe operation with peak line voltages up to ~170 V DC. It is not rated for 230 V AC operation-use SSL21091T/1,118 for higher-input-voltage applications.
Does the SSL21081T/1,118 require an external Schottky diode in buck configuration?
No, the SSL21081T/1,118 does not require an external Schottky diode. Its boundary conduction mode operation with zero-current switching (ZCS) eliminates reverse recovery losses, enabling use of low-cost standard PN diodes or synchronous rectification-reducing BOM cost and thermal stress.
How does the SSL21081T/1,118 implement thermal protection for LEDs?
The SSL21081T/1,118 uses the NTC pin to monitor LED temperature via an external NTC thermistor. When the sensed voltage drops below Vth(low)NTC (0.35 V typ), output current is linearly reduced; below Vact(tmr)NTC (0.29 V typ), a timer initiates thermal shutdown if the condition persists beyond 46 μs, halting switching until cool-down.
Can the SSL21081T/1,118 be used with PWM dimming signals?
Yes, the SSL21081T/1,118 supports direct PWM current regulation via the NTC pin. Applying a digital PWM signal pulls the pin low to reduce or disable LED current, enabling external microcontroller-based dimming without modifying the analog current-sense path or requiring additional ICs.
What protection features are latched versus auto-recovering in the SSL21081T/1,118?
The SSL21081T/1,118 implements latched Short-Winding Protection (SWP) and Output Short Protection (OSP), requiring power cycle reset. In contrast, UnderVoltage LockOut (UVLO), Brownout, and OverTemperature Protection (OTP) are safe-restart features-the IC halts, cools or recovers, then automatically restarts when VCC resets above VCC(rst) = 5 V.
SSL21081T/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
- Frequency:
- 100kHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SSL21081T/1,118 FAQ
1.How can I place an order for SSL21081T/1,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for SSL21081T/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 SSL21081T/1,118 reliable?
The price and inventory of SSL21081T/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 SSL21081T/1,118 is usually 5 days.
3.What payment methods are accepted for SSL21081T/1,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSL21081T/1,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SSL21081T/1,118?
SSL21081T/1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SSL21081T/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 SSL21081T/1,118?
For technical support, including SSL21081T/1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSL21081T/1,118 requirements.
6.How does Aetrix verify that SSL21081T/1,118 is sourced from the original manufacturer or authorized distributors?
All SSL21081T/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 SSL21081T/1,118 meets industry standards.
7.What is the process for return or replacement of SSL21081T/1,118?
All SSL21081T/1,118 units undergo pre-shipment inspection (PSI). If there is an issue with SSL21081T/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 SSL21081T/1,118 part is unused and in its original packaging.
Return procedure for SSL21081T/1,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SSL21081T/1,118 Tags
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