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STMicroelectronics TN22-1500H
- Part No.:
- TN22-1500H
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Datasheet:
-
TN22-1500H.pdf
- Description:
- SCR 400V 2A IPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,872
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Product details
Overview
TN22-1500H from STMicroelectronics is a high-voltage silicon controlled rectifier (SCR) designed specifically as the main switching element in fluorescent tube electronic starter circuits. It features a clamping breakdown voltage of 1200–1500 V, low gate trigger current (<1.5 mA), and high holding current (>175 mA), enabling reliable lamp ignition with minimal external drive power in line-powered AC starter topologies.
For engineers reviewing the TN22-1500H datasheet, TN22-1500H pinout, TN22-1500H application, or TN22-1500H equivalent, key selection criteria include verified VBR range (1200–1500 V), IH ≥ 175 mA for sustained preheat conduction, dV/dt immunity ≥ 500 V/µs at Tj = 110 °C, and IPAK package thermal resistance Rth(j-c) = 3 °C/W for thermal management in compact starters.
Technical Context
The TN22-1500H operates as a voltage-triggered thyristor switch in a two-stage fluorescent starter: first conducting during filament preheating (held on by C1 charge), then forcibly commutated off by SCR gate pull-down to generate the inductive kick. Its high VBR (1200–1500 V) ensures sufficient overvoltage for reliable tube striking without flashover.
It uses a high-clamping-voltage structure with optimized gate sensitivity (IGT ≤ 1.5 mA at VD = 12 V) and robust dV/dt immunity (≥500 V/µs), allowing direct mains-synchronized triggering without auxiliary amplification. The 175 mA minimum holding current guarantees stable conduction across full sine-wave preheat cycles under varying line conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR | 1200–1500 V: Clamping voltage range ensuring reliable fluorescent tube ignition without dielectric failure |
| IH | ≥175 mA: Minimum holding current guaranteeing uninterrupted preheat conduction through AC zero crossings |
| IGT | ≤1.5 mA @ VD=12 V: Gate trigger current low enough for direct drive from RC-detected line voltage |
| dV/dt | ≥500 V/µs @ Tj=110 °C: Immunity to false turn-on during fast transients in noisy mains environments |
| Rth(j-c) | 3 °C/W: Junction-to-case thermal resistance enabling 2 A RMS operation with minimal heatsinking in IPAK |
| VGT | ≤3 V @ RGK=1 kΩ: Gate threshold voltage compatible with standard zener-biased trigger networks |
| IT(RMS) | 2 A @ Tc=95 °C: Continuous RMS current rating supporting full-sine preheat duty in commercial starters |
Pinout & Package
Package: IPAK (TO-251AA), epoxy body meeting UL94 V0, lead-free, with tab (Pin 2) electrically connected to cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Main current entry terminal | Connected to rectified mains input; carries full preheat current and ignition surge |
| 2 (Tab / Cathode) | Main current exit & thermal path | Electrically tied to cathode; mounted to heatsink for thermal dissipation and EMI shielding |
| 3 (Gate) | Trigger control input | Receives low-current pulse from voltage-detect RC network; sensitive to ≤1.5 mA |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage clamping | 1200–1500 V breakdown ensures consistent tube ignition across lamp aging and temperature drift |
| Low-power gate drive | ≤1.5 mA IGT enables direct triggering from passive RCD detector-no transistor buffer needed |
| High holding current | ≥175 mA IH prevents premature turn-off during low-current preheat phase near zero-crossings |
| Robust dV/dt immunity | ≥500 V/µs withstand prevents spurious turn-on from ballast ringing or line transients |
Applications
| Fluorescent Lamp Starter | AC Mains-Powered Preheat Circuit |
|---|---|
Use Scenario: Electronic starter for T8/T12 linear fluorescent tubes operating from 220–240 VAC mains. IC Role / Device Role / Timing Role: Main high-voltage switch controlling filament preheat duration and generating ignition pulse via forced commutation. Use Value: Enables >10,000-cycle lamp life by delivering precise 2–3 s preheat and repeatable 1300 V ignition pulses. | Use Scenario: Compact, low-BOM-cost starter module for LED retrofit-compatible fluorescent fixtures. IC Role / Device Role / Timing Role: Voltage-triggered thyristor providing zero-crossing synchronized conduction during preheat and controlled turn-off for inductive kick generation. Use Value: Eliminates need for gate driver ICs or transformers-reduces component count by 3–4 parts per starter. |
| Energy-Efficient Ballast Interface | Industrial Fixture Ignition Control |
Use Scenario: Starter integrated into electronic ballasts with programmable preheat timing and fault retry logic. IC Role / Device Role / Timing Role: High-reliability switching element interfacing between microcontroller-controlled timing circuitry and lamp load. Use Value: Supports adaptive preheat (2–5 s) and up to 5 retry attempts before lockout-improves cold-start reliability at –25 °C. | Use Scenario: Heavy-duty fluorescent lighting in factory, warehouse, or outdoor pole-mounted fixtures. IC Role / Device Role / Timing Role: Robust mains-switching device rated for 2 A RMS and 22 A surge, operating continuously at Tc = 95 °C. Use Value: Maintains stable operation under voltage sags, harmonics, and ambient temperatures up to +60 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fluorescent starter SCR applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST TN22-1200H | VBR = 1200–1300 V (lower clamping); identical IH, IGT, and package | Suitable only for shorter lamps or lower-line-voltage regions (e.g., 100–120 VAC systems) | Select when lower ignition voltage suffices and cost optimization is prioritized |
| Littelfuse S4006L | Higher IT(RMS) = 4 A but IH = 100 mA (lower holding current); TO-220 package only | Requires gate buffer for reliable preheat hold; not drop-in for TN22-1500H's low-IGT topology | Choose only if higher surge rating is critical and circuit redesign for gate drive is acceptable |
Compared with TN22-1200H and S4006L, the TN22-1500H uniquely balances high clamping voltage (1200–1500 V), low gate drive (≤1.5 mA), and high holding current (≥175 mA) to enable compact, transformerless, single-SCR starter designs with no external amplification.
Availability
TN22-1500H is available at Aetrix Electronics and suitable for fluorescent lamp starters, AC mains preheat circuits, and industrial fixture ignition control requiring stable component supply and long-term production support.
Supply support for TN22-1500H 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The TN22 series belongs to ST's legacy power discrete portfolio, developed specifically for energy-efficient fluorescent lighting control-emphasizing high-voltage robustness, low-drive simplicity, and thermal resilience in compact packages.
FAQ
What is the function of the TN22-1500H in a fluorescent starter circuit?
The TN22-1500H acts as the main high-voltage thyristor switch: it conducts during filament preheating (held on by capacitor charge), then turns off when triggered by an external SCR to generate the inductive kick voltage across the lamp. Its 1200–1500 V breakdown clamps this pulse to ensure reliable tube ignition without flashover.
Can TN22-1500H be used with 110 VAC mains?
Yes, but with design adaptation: the 1200–1500 V VBR remains valid, yet preheat timing and ignition pulse energy must be recalculated. At 110 VAC, peak rectified voltage is ~155 V-insufficient to reach VBR naturally-so the starter circuit must use a step-up transformer or voltage multiplier to achieve required striking voltage.
What is the maximum allowable case temperature for continuous operation?
The TN22-1500H supports continuous operation up to Tc = 95 °C, as validated by its IT(RMS) = 2 A rating at that temperature. Exceeding 95 °C reduces safe RMS current capacity; derating follows Figure 2 in the datasheet, reaching ~1.2 A at Tc = 110 °C.
Is the IPAK package of TN22-1500H RoHS and REACH compliant?
Yes-the IPAK package is lead-free and complies with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. ST certifies ECOPACK® compliance, and the device carries the "E3" marking indicating lead-free finish per JEDEC J-STD-609.
TN22-1500H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Off State:
- 400 V
- Voltage - Gate Trigger (Vgt) (Max):
- 3 V
- Current - Gate Trigger (Igt) (Max):
- 1.5 mA
- Voltage - On State (Vtm) (Max):
- 3.1 V
- Current - On State (It (AV)) (Max):
- 1.8 A
- Current - On State (It (RMS)) (Max):
- 2 A
- Current - Hold (Ih) (Max):
- 175 mA
- Current - Off State (Max):
- 100 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 20A, 22A
- SCR Type:
- Standard Recovery
- Operating Temperature:
- -40°C ~ 110°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-251 (IPAK)
TN22-1500H FAQ
1.How can I place an order for TN22-1500H through Aetrix?
Please submit a Request for Quotation (RFQ) for TN22-1500H 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 TN22-1500H reliable?
The price and inventory of TN22-1500H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TN22-1500H is usually 5 days.
3.What payment methods are accepted for TN22-1500H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TN22-1500H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TN22-1500H?
TN22-1500H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TN22-1500H 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 TN22-1500H?
For technical support, including TN22-1500H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TN22-1500H requirements.
6.How does Aetrix verify that TN22-1500H is sourced from the original manufacturer or authorized distributors?
All TN22-1500H 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 TN22-1500H meets industry standards.
7.What is the process for return or replacement of TN22-1500H?
All TN22-1500H units undergo pre-shipment inspection (PSI). If there is an issue with TN22-1500H, 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 TN22-1500H part is unused and in its original packaging.
Return procedure for TN22-1500H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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