My Inquiry
My Account
STMicroelectronics 1.5KE440ARL
- Part No.:
- 1.5KE440ARL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE440ARL.pdf
- Description:
- TVS DIODE 376VWM 776VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:3,967
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KE440ARL from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in DO-201 package, designed for high-energy surge protection in power supplies and industrial interfaces. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 603 V (max) under 3.5 A surge current, and operates up to +175 °C junction temperature. Used in AC/DC front-end protection against IEC 61000-4-4 level 4 (4 kV) and ESD per IEC 61000-4-2 (30 kV contact/air).
For engineers reviewing the 1.5KE440ARL datasheet, 1.5KE440ARL pinout, 1.5KE440ARL application, or 1.5KE440ARL equivalent, key selection criteria include standoff voltage (440 V), clamping voltage (603 V max), peak pulse current (3.5 A), thermal robustness (Tj = 175 °C), and DO-201 mechanical compatibility with high-power PCB layouts.
Technical Context
This unidirectional TVS diode uses planar silicon junction technology optimized for low leakage (<1 µA at VRM = 376 V) and stable clamping over temperature. Its dynamic resistance (RD = 24.2 Ω) and voltage temperature coefficient (αT = 11 × 10⁻⁴ /°C) enable predictable VCL drift across –55 °C to +175 °C operating range.
The device meets IEC 61000-4-2 (30 kV air/contact discharge) and IEC 61000-4-4 level 4 (4 kV) immunity requirements. Its 10/1000 µs waveform rating supports protection of rectifier bridges, DC bus lines, and input stages where fast response and high energy absorption are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 376 V - Maximum continuous reverse working voltage before breakdown |
| Breakdown Voltage (VBR) | 418 V min @ 1 mA - Ensures reliable triggering above system nominal voltage |
| Clamping Voltage (VCL) | 603 V max @ 3.5 A (10/1000 µs) - Limits transient voltage seen by downstream components |
| Peak Pulse Power | 1500 W (10/1000 µs) - Sustains high-energy surges without failure |
| Junction Temperature Range | –55 °C to +175 °C - Enables use in harsh environments like industrial motor drives |
| Leakage Current (IRM) | 1 µA max @ 376 V - Minimizes standby power loss in high-impedance circuits |
| Dynamic Resistance (RD) | 24.2 Ω - Determines VCL rise slope under increasing surge current |
Pinout & Package
1.5KE440ARL is housed in a DO-201 axial leaded package (8.5–9.5 mm length, 4.8–5.3 mm diameter), with cathode indicated by band marking and red tape orientation on reel. Leads are matte tin-plated for solderability and RoHS compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamp configuration |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., AC input or DC bus); band-marked terminal |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous operation up to +175 °C junction temperature, supporting compact thermal design in enclosed power systems |
| Low-leakage planar junction | IRM ≤ 1 µA at 376 V enables use in high-impedance sensing or battery-backed circuits without signal corruption |
| IEC 61000-4-2 ESD immunity | Withstands 30 kV air and contact discharge - exceeds level 4, eliminating need for secondary ESD stages |
| Robust surge capability | 1500 W (10/1000 µs) and 10 kW (8/20 µs) ratings support both lightning-induced and switching transient protection |
| Standardized DO-201 footprint | Enables drop-in replacement in legacy designs and compatibility with automated axial insertion equipment |
Applications
| AC/DC Power Supply Input Protection | Industrial Motor Drive DC Bus Clamping |
|---|---|
Use Scenario: Protects bridge rectifiers and bulk capacitors from line transients and load dump events in off-line SMPS. IC Role / Device Role / Timing Role: Unidirectional TVS placed between L/N and earth or across DC bus rails to clamp surges before they reach filtering or regulation stages. Use Value: Clamps 4 kV IEC 61000-4-4 surges to ≤603 V, preventing MOSFET gate oxide rupture and capacitor overvoltage failure. | Use Scenario: Shields IGBT gate drivers and bus capacitors from inductive kickback during rapid motor deceleration. IC Role / Device Role / Timing Role: Mounted across DC+ and DC− rails to absorb regenerative energy spikes exceeding 1500 W for <1 ms. Use Value: Maintains clamping stability at Tj = 175 °C, ensuring protection remains effective during sustained overload conditions. |
| Telecom Line Interface Surge Suppression | Renewable Energy Inverter DC Link Protection |
Use Scenario: Installed on primary-side telecom power inputs exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Acts as first-line defense in series with MOVs or GDTs, absorbing fast-rising 8/20 µs transients up to 10 kW. Use Value: Low dynamic resistance (24.2 Ω) ensures minimal overshoot during multi-kA events, preserving upstream fuse integrity. | Use Scenario: Safeguards photovoltaic inverter DC link against grid-switching transients and PV array fault currents. IC Role / Device Role / Timing Role: Positioned across MPPT converter output to limit voltage excursions during islanding detection or anti-islanding shutdown. Use Value: Stable VBR temperature coefficient (11 × 10⁻⁴ /°C) prevents false triggering in desert-mounted inverters operating at ambient >60 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ440A | DO-214AA package; lower 600 W rating; 648 V clamping @ 2.3 A | Surface-mount only; unsuitable for high-current axial layouts or through-hole rework | Select when board space is constrained and surge energy is ≤600 W |
| 1N5448G | DO-201; 1000 W rating; 620 V clamping @ 2.4 A; no IEC 61000-4-2 certification | Lacks ESD qualification; limited to non-compliant industrial equipment | Choose only for cost-sensitive legacy designs where ESD immunity is not required |
Compared with SMBJ440A and 1N5448G, 1.5KE440ARL provides higher surge capacity (1500 W vs. 600 W/1000 W), certified ESD performance (30 kV), and proven thermal stability at 175 °C - making it the preferred choice for safety-critical AC/DC and motor drive applications.
Availability
1.5KE440ARL is available at Aetrix Electronics and suitable for AC/DC power supply input protection, industrial motor drive DC bus clamping, and renewable energy inverter DC link protection requiring stable component supply and long-term lifecycle assurance.
Supply support for 1.5KE440ARL 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 innovative solutions across automotive, industrial, power, and analog markets with strong IP and manufacturing control.
The 1.5KE series belongs to ST's high-power TVS portfolio, engineered specifically for robust overvoltage protection in mains-connected equipment, SMPS front-ends, and industrial power conversion systems where reliability under thermal and electrical stress is mandatory.
FAQ
What is the maximum clamping voltage for 1.5KE440ARL under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 603 V at 3.5 A peak pulse current for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature at a rate defined by αT = 11 × 10⁻⁴ /°C, so actual clamping in hot environments must be calculated using the provided temperature coefficient formula.
Is 1.5KE440ARL suitable for bidirectional surge protection?
No - 1.5KE440ARL is unidirectional (denoted by "A" suffix). For bidirectional protection, use the 1.5KE440CA variant, which features symmetrical clamping in both polarities and identical standoff and clamping specifications but different marking and tape orientation (red tape on both sides).
How does the DO-201 package affect thermal performance compared to SMD alternatives?
The DO-201 axial package offers superior thermal mass and direct lead-to-board heat conduction versus SMD packages like DO-214AA. At 175 °C junction temperature, its thermal resistance allows sustained 1500 W dissipation without derating - unlike surface-mount equivalents that require large copper pours or active cooling to achieve comparable performance.
Does 1.5KE440ARL meet UL 497B and IEC 61000-4-4 requirements?
Yes - it carries UL 497B file number QVGQ2.E136224 and is rated for IEC 61000-4-4 level 4 (4 kV), as confirmed in ST's DS0636 Rev 5 datasheet. It also exceeds IEC 61000-4-2 level 4 for ESD (30 kV air/contact discharge), satisfying full immunity testing requirements for Class B industrial equipment.
1.5KE440ARL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 376V
- Voltage - Breakdown (Min):
- 418V
- Voltage - Clamping (Max) @ Ipp:
- 776V
- Current - Peak Pulse (10/1000µs):
- 13A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 360pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE440ARL FAQ
1.How can I place an order for 1.5KE440ARL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE440ARL 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 1.5KE440ARL reliable?
The price and inventory of 1.5KE440ARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE440ARL is usually 5 days.
3.What payment methods are accepted for 1.5KE440ARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE440ARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE440ARL?
1.5KE440ARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE440ARL 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 1.5KE440ARL?
For technical support, including 1.5KE440ARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE440ARL requirements.
6.How does Aetrix verify that 1.5KE440ARL is sourced from the original manufacturer or authorized distributors?
All 1.5KE440ARL 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 1.5KE440ARL meets industry standards.
7.What is the process for return or replacement of 1.5KE440ARL?
All 1.5KE440ARL units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE440ARL, 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 1.5KE440ARL part is unused and in its original packaging.
Return procedure for 1.5KE440ARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE440ARL Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
