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STMicroelectronics 1.5KE120ARL
- Part No.:
- 1.5KE120ARL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE120ARL.pdf
- Description:
- TVS DIODE 102VWM 212VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:5,786
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Product details
Overview
1.5KE120ARL from STMicroelectronics is a unidirectional Transil™ transient voltage suppression (TVS) diode in DO-201 package, designed for high-energy surge protection with 1500 W peak pulse power (10/1000 µs), 120 V breakdown voltage (min 114 V, max 126 V at 1 mA), and 165 V clamping voltage at 9.1 A peak pulse current. It protects MOSFETs, low-voltage ICs, and power rails in industrial power supplies and telecom interfaces.
For engineers reviewing the 1.5KE120ARL datasheet, 1.5KE120ARL pinout, 1.5KE120ARL application, or 1.5KE120ARL equivalent, key selection criteria include clamping ratio (1.375), leakage current (<1 µA at 97.6 V), junction temperature rating (175 °C), and UL 497B certification for surge protection systems.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches rapidly (<1 ns response) to divert surge current away from sensitive downstream circuitry. Its low dynamic impedance (typ. 10.7 Ω) ensures stable clamping under 10/1000 µs transients.
The device uses silicon avalanche technology with controlled doping to achieve precise breakdown tolerance (±5% at 120 V nominal), temperature coefficient αT = 10.7 × 10−4/°C, and thermal resistance Rth(j-l) = 20 °C/W - enabling reliable operation without heatsinking up to 5 W continuous dissipation at 75 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W (10/1000 µs waveform): sustains single high-energy surges per IEC 61000-4-5 Level 4 without failure |
| Breakdown Voltage VBR | 114–126 V @ 1 mA: defines precise clamping onset threshold for 120 V nominal rail protection |
| Clamping Voltage VCL | 165 V @ 9.1 A (10/1000 µs): limits maximum voltage seen by protected IC during surge |
| Leakage Current IR | <1 µA @ 97.6 V (0.81 × VBR(min)): ensures negligible standby power loss in always-on circuits |
| Junction Temperature | 175 °C max: supports operation in high-ambient environments like enclosed power converters |
| Package | DO-201 axial leaded: industry-standard through-hole package with 0.876 g mass and UL94 V0 epoxy |
Pinout & Package
DO-201 package: axial-leaded, epoxy-molded, lead-free, UL94 V0 compliant. Dimensions: A = 8.5–9.5 mm (body length), B = 25.4 mm (lead spacing), C = 4.8–5.3 mm (diameter), D = 0.96–1.06 mm (lead diameter). Weight: 0.876 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping factor (VCL/VBR) | 1.375 - minimizes overvoltage stress on 120 V-rated components during surge events |
| Fast response time | <1 ns - activates before most semiconductor damage thresholds are exceeded |
| UL 497B certified | QVGQ2.E136224 - validated for telecom/data line surge protection per ANSI/UL standards |
| High surge current capability | 9.1 A (10/1000 µs) - handles repeated lightning-induced transients in outdoor equipment |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
|
Use Scenario: 120 V DC input stage of DIN-rail power supply exposed to load dump and inductive switching transients. IC Role / Device Role: Primary shunt TVS across input capacitor to clamp surges before they reach DC-DC controller IC. Use Value: Limits transient voltage to ≤165 V, preventing gate oxide rupture in 200 V-rated MOSFETs and overvoltage lockout in PWM controllers. |
Use Scenario: T1/E1 line interface card in central office equipment subjected to induced surges from nearby lightning strikes. IC Role / Device Role: First-stage protection on tip/ring lines before transformer coupling and receiver ICs. Use Value: Clamps common-mode surges to <165 V while maintaining <1 µA leakage at 97.6 V, preserving signal integrity on 100 Ω balanced lines. |
| Motor Drive DC Bus | Renewable Energy Inverter Input |
|
Use Scenario: 120 V DC bus in HVAC variable-frequency drive where IGBT turn-off causes inductive kickback. IC Role / Device Role: Snubber-connected TVS across bus capacitors to absorb repetitive switching spikes. Use Value: Withstands ≥1000 surges at 9.1 A (10/1000 µs) without parameter shift, ensuring long-term reliability in 24/7 operation. |
Use Scenario: PV string input of microinverter rated for 120 V MPPT range, subject to solar array surge coupling. IC Role / Device Role: Unidirectional clamping device between PV+ and ground to suppress positive-going transients. Use Value: 175 °C junction rating allows mounting near heat-generating power stages without derating, reducing board space vs. lower-Tj alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | DO-214AA package, 1000 W rating, 120 V VBR, 165 V VCL @ 6.1 A | Surface-mount only; lower surge current handling than 1.5KE120ARL | Choose for space-constrained PCBs where 6.1 A surge capacity suffices and through-hole assembly is unavailable. |
| P6KE120A | DO-15 package, 600 W rating, 120 V VBR, 165 V VCL @ 3.6 A | Lower power rating and smaller thermal mass; not UL 497B certified | Select only for cost-sensitive, non-certified consumer-grade designs with infrequent, low-energy transients. |
Compared with SMBJ120A and P6KE120A, the 1.5KE120ARL delivers 2.5× higher surge current (9.1 A vs. 6.1 A/3.6 A) and full UL 497B compliance - making it the sole choice for industrial and telecom infrastructure requiring sustained 1500 W surge immunity and regulatory validation.
Availability
1.5KE120ARL is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, motor drive DC buses, and renewable energy inverter inputs requiring stable component supply and long-term obsolescence management.
Supply support for 1.5KE120ARL 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
The Transil™ TVS diode product line targets robust, standardized overvoltage protection for mission-critical power and signal lines - emphasizing high surge robustness, tight parametric control, and international safety certifications.
FAQ
What is the maximum allowable surge current for 1.5KE120ARL under IEC 61000-4-5 testing?
The 1.5KE120ARL is rated for 9.1 A peak pulse current under the 10/1000 µs waveform defined in IEC 61000-4-5. This corresponds to its 1500 W peak pulse power rating at VCL = 165 V. It withstands this level without parameter degradation when mounted on a standard FR4 PCB with 10 mm lead length, per ST's characterization in Doc ID 2913 Rev 4.
Does 1.5KE120ARL require a heatsink for continuous operation?
No heatsink is required for continuous operation at ambient temperatures ≤75 °C, where its power dissipation is limited to 5 W on an infinite heatsink. Its Rth(j-l) = 20 °C/W and 175 °C maximum junction temperature allow direct PCB mounting with standard copper pour - verified in thermal testing per Figure 3 of the datasheet.
How does the clamping voltage change with junction temperature?
VCL increases linearly with junction temperature due to the positive temperature coefficient of avalanche breakdown. Using αT = 10.7 × 10−4/°C and VBR(25 °C) = 120 V, VCL rises ~0.13 V/°C above 25 °C. At 125 °C junction temperature, VCL increases by ~13 V versus room-temperature value - a critical design margin consideration for high-temp environments.
Can 1.5KE120ARL be used in bidirectional configurations?
No - 1.5KE120ARL is unidirectional (indicated by "A" suffix). For bidirectional protection, ST offers the 1.5KE120CA variant, which has symmetrical clamping in both polarities and half the capacitance (500 pF vs. 1000 pF at 1 MHz) due to dual-junction construction. Substituting the "A" version in bidirectional circuits risks forward conduction and failure.
1.5KE120ARL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 102V
- Voltage - Breakdown (Min):
- 114V
- Voltage - Clamping (Max) @ Ipp:
- 212V
- Current - Peak Pulse (10/1000µs):
- 47A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1000pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE120ARL FAQ
1.How can I place an order for 1.5KE120ARL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE120ARL 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 1.5KE120ARL reliable?
The price and inventory of 1.5KE120ARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE120ARL is usually 5 days.
3.What payment methods are accepted for 1.5KE120ARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE120ARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE120ARL?
1.5KE120ARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE120ARL 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 1.5KE120ARL?
For technical support, including 1.5KE120ARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE120ARL requirements.
6.How does Aetrix verify that 1.5KE120ARL is sourced from the original manufacturer or authorized distributors?
All 1.5KE120ARL 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 1.5KE120ARL meets industry standards.
7.What is the process for return or replacement of 1.5KE120ARL?
All 1.5KE120ARL units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE120ARL, 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 1.5KE120ARL part is unused and in its original packaging.
Return procedure for 1.5KE120ARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE120ARL Tags
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