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STMicroelectronics 1.5KE56ARL
- Part No.:
- 1.5KE56ARL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE56ARL.pdf
- Description:
- TVS DIODE 47.8VWM 100VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:1,239
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Product details
Overview
1.5KE56ARL from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode in DO-201 package, designed for clamping ESD and surge events up to 77 V (VCL) at 19.5 A (IPP) under 10/1000 µs waveform. It features 56 V breakdown voltage (VBR), 1 µA max reverse leakage at 47.8 V, and operates from –55 °C to +175 °C junction temperature. Used in DC power rail protection for industrial SMPS and telecom interfaces.
For engineers reviewing the 1.5KE56ARL datasheet, 1.5KE56ARL pinout, 1.5KE56ARL application, or 1.5KE56ARL equivalent, key selection criteria include clamping voltage (77 V), peak pulse current (19.5 A), unidirectional polarity, DO-201 mechanical compatibility, and IEC 61000-4-2/4-4 compliance for system-level surge immunity validation.
Technical Context
This TVS diode employs planar silicon junction technology optimized for low leakage (<1 µA at VRM) and stable VBR drift (αT = 10.3 × 10–4/°C) across –55 °C to +175 °C. Its unidirectional configuration enables cathode-anode polarity alignment with DC supply rails to suppress positive-going transients only.
The device delivers 1500 W peak pulse power (10/1000 µs) at Tamb = 25 °C and retains 1100 W capability at Tj = 175 °C. Clamping behavior is defined by dynamic resistance RD = 0.933 Ω, enabling predictable VCL rise under increasing IPP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 47.8 V - Ensures reliable conduction onset above normal 48 V DC rail operating voltage |
| VCL @ IPP | 77 V - Maximum clamped voltage seen by protected circuit during 19.5 A surge |
| IPP | 19.5 A - Peak surge current handled under standard 10/1000 µs waveform |
| RD | 0.933 Ω - Dynamic resistance governing VCL linearity vs. IPP variation |
| Tj max | +175 °C - Enables operation in high-temperature environments like enclosed power supplies |
| Leakage (IRM) | 1 µA @ 47.8 V - Minimizes standby power loss in always-on systems |
| ESD rating | ±30 kV contact & air discharge - Meets IEC 61000-4-2 Level 4 without external shielding |
Pinout & Package
1.5KE56ARL uses the axial-leaded DO-201 package (8.5–9.5 mm length, 4.8–5.3 mm diameter), with cathode identified by band marking and lead finish of matte tin plating. Leads are spaced for through-hole PCB mounting and support 260 °C soldering for 10 s at 5 mm from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to ground or low-impedance reference to complete clamping loop during positive transients |
| Cathode | Protected node connection | Connected to DC rail or signal line requiring overvoltage protection; conducts when VK-A > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Peak pulse power | 1500 W (10/1000 µs) - Sustains high-energy surges common in industrial AC/DC front-ends |
| Clamping ratio (VCL/VBR) | 1.37 - Low ratio ensures minimal overvoltage stress on downstream ICs during clamping |
| Temperature coefficient αT | 10.3 × 10–4/°C - Predictable VBR shift allows accurate margining across thermal range |
| IEC 61000-4-4 level | 4 kV - Validated for repetitive fast transient burst immunity in industrial control cabinets |
| UL 497B recognition | QVGQ2.E136224 - Supports safety-certified designs for telecom and building automation equipment |
Applications
| Industrial SMPS Input Protection | Telecom Line Interface |
|---|---|
|
Use Scenario: 48 V DC input stage of DIN-rail mounted switch-mode power supply exposed to load dump and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected between +48 V rail and chassis ground to clamp positive transients before they reach primary-side controller IC. Use Value: Limits voltage to ≤77 V during 19.5 A surges, protecting MOSFET gate drivers and feedback optocouplers rated for 100 V max. |
Use Scenario: Ethernet PHY interface on industrial gateway with PoE+ (IEEE 802.3at) and external RJ45 jack. IC Role / Device Role / Timing Role: TVS placed on each data pair (TD+, TD–, RD+, RD–) referenced to local ground to suppress ESD and induced transients. Use Value: Withstands ±30 kV contact ESD per IEC 61000-4-2 and clamps 4 kV EFT bursts to safe levels for 100BASE-TX magnetics and PHY transceivers. |
| Automotive Body Control Module | Factory Automation I/O Card |
|
Use Scenario: 12 V battery-supplied body control module with LIN bus and sensor inputs subject to ISO 7637-2 pulse 1/2a/3a. IC Role / Device Role / Timing Role: TVS installed on LIN transceiver VCC pin and LIN bus line to absorb negative-going load dump and positive spikes. Use Value: Maintains operation at Tj = 175 °C during under-hood thermal cycling while limiting clamping voltage to protect 16 V-rated LIN ICs. |
Use Scenario: Digital input card receiving 24 V DC signals from proximity sensors and limit switches in PLC-controlled machinery. IC Role / Device Role / Timing Role: TVS placed on each input channel between signal line and 0 V to suppress inductive kickback from solenoid loads and relay coils. Use Value: Handles 200 A non-repetitive forward surge (IFSM) without failure, ensuring long-term reliability in high-noise factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A | DO-214AA package, 58 V VBR, 64.8 V VCL @ 15.4 A, lower PPP = 600 W | Surface-mount only; unsuitable for high-current axial-leaded layouts or legacy through-hole designs | Select when board space is constrained and surge energy is ≤600 W; verify thermal pad layout for 15.4 A IPP |
| 1N5388B | DO-201, 56 V Zener, 5 W continuous dissipation, no surge rating or IEC certification | No transient immunity validation; cannot replace TVS in ESD/surge-critical paths | Use only for low-power voltage regulation; never as functional substitute for 1.5KE56ARL in protection circuits |
Compared with SMBJ58A and 1N5388B, 1.5KE56ARL uniquely combines axial-leaded DO-201 mechanical compatibility, 1500 W surge handling, and full IEC/UL certification-making it irreplaceable in high-reliability through-hole power rail protection where both energy capacity and regulatory compliance are mandatory.
Availability
1.5KE56ARL is available at Aetrix Electronics and suitable for industrial SMPS input protection, telecom line interface, automotive body control modules, and factory automation I/O cards requiring stable component supply across extended temperature and surge stress conditions.
Supply support for 1.5KE56ARL 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.
The 1.5KE series belongs to ST's high-power TVS portfolio, engineered specifically for robust overvoltage protection in harsh electromagnetic environments where reliability under repeated surge stress is critical.
FAQ
What is the polarity configuration of 1.5KE56ARL?
1.5KE56ARL is a unidirectional TVS diode, meaning it conducts only when the cathode is positive relative to the anode. This configuration protects against positive-going transients on DC supply lines while blocking reverse voltage. The "A" suffix in the part number explicitly denotes unidirectional type, distinct from bidirectional "CA" variants.
Can 1.5KE56ARL be used in parallel for higher surge current handling?
No-parallel connection of 1.5KE56ARL devices is not recommended due to mismatched VBR tolerances (±5%) and dynamic resistance variations, which cause uneven current sharing and potential thermal runaway. For higher IPP, select a single higher-rated TVS such as 1.5KE62ARL (212 A) or use a multi-chip TVS array designed for balanced distribution.
What is the maximum allowable surge repetition rate for 1.5KE56ARL?
The datasheet does not specify a maximum repetition rate; however, thermal recovery between pulses must allow junction temperature to return below 175 °C. For 10/1000 µs surges at full 1500 W, minimum inter-pulse interval should exceed 1 second at 25 °C ambient. Derate based on actual Tamb, PCB copper area, and airflow using the thermal impedance curve (Figure 11) in DS0636 Rev 5.
Does 1.5KE56ARL meet RoHS and REACH requirements?
Yes-1.5KE56ARL is manufactured in STMicroelectronics' ECOPACK-compliant process, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead finish is matte tin, and the DO-201 package contains no intentionally added lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE, as confirmed in ST's material declarations.
1.5KE56ARL 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):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 100V
- Current - Peak Pulse (10/1000µs):
- 100A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1800pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE56ARL FAQ
1.How can I place an order for 1.5KE56ARL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE56ARL 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 1.5KE56ARL reliable?
The price and inventory of 1.5KE56ARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE56ARL is usually 5 days.
3.What payment methods are accepted for 1.5KE56ARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE56ARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE56ARL?
1.5KE56ARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE56ARL 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 1.5KE56ARL?
For technical support, including 1.5KE56ARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE56ARL requirements.
6.How does Aetrix verify that 1.5KE56ARL is sourced from the original manufacturer or authorized distributors?
All 1.5KE56ARL 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 1.5KE56ARL meets industry standards.
7.What is the process for return or replacement of 1.5KE56ARL?
All 1.5KE56ARL units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE56ARL, 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 1.5KE56ARL part is unused and in its original packaging.
Return procedure for 1.5KE56ARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE56ARL Tags
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