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Taiwan Semiconductor Corporation 1.5KE440
- Part No.:
- 1.5KE440
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE440.pdf
- Description:
- 1500W, 440V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,835
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Product details
Overview
1.5KE440 from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 440 V, clamping voltage of 631 V at 2.4 A peak pulse current, and DO-201 axial package. It delivers robust surge protection for high-voltage industrial power rails and automotive ECU inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1.5KE440 datasheet, 1.5KE440 pinout, 1.5KE440 application, or 1.5KE440 equivalent, this part is selected for high-energy transient suppression where precise VBR (396–484 V), low dynamic impedance, sub-1 ps response, and 175°C junction rating are required in space-constrained through-hole designs.
Technical Context
The 1.5KE440 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (396–484 V at 1.0 mA test current) to clamp transient energy into ground. Its 631 V maximum clamping voltage at 2.4 A IPP ensures downstream ICs remain below safe absolute maximum ratings during 10/1000 μs surges.
Designed for non-repetitive surge events, it sustains 1500 W peak pulse power at TA = 25°C with thermal derating above ambient, and exhibits <1 μA leakage at 356 V working stand-off voltage. Polarity is marked by cathode band; no forward conduction is intended in normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 396–484 V - Ensures reliable turn-on across manufacturing tolerance before clamping begins |
| VWM | 356 V - Maximum continuous reverse operating voltage without significant leakage |
| VC @ IPP = 2.4 A | 631 V - Clamped voltage seen by protected circuit during full 1500 W surge event |
| PPK | 1500 W - Peak transient power dissipation capability per 10/1000 μs waveform |
| TJ max | 175°C - Enables operation in under-hood automotive or high-ambient industrial environments |
| Package | DO-201 - Axial-leaded, UL 94V-0 molded case with tin-plated leads for reliable through-hole soldering |
| Response time | <1.0 ps - Near-instantaneous avalanche initiation prevents voltage overshoot before clamping |
Pinout & Package
DO-201 package: axial-leaded, cylindrical epoxy body with cathode band marking polarity. Leads are pure tin-plated, solderable per J-STD-002; weight ≈ 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path to sink surge current |
| Cathode | Protected line input | Connected to high-side rail (e.g., 24 V, 48 V, or 300+ V DC bus) requiring transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W surge rating (10/1000 μs) | Withstands high-energy load dump and inductive switching events without degradation |
| Clamping ratio VC/VBR ≈ 1.59 | Low overvoltage margin ensures tight protection window for 400 V-class systems |
| Leakage current <1 μA @ 356 V | Minimizes standby power loss and avoids false triggering in high-impedance sensing circuits |
| AEC-Q101 qualified option available | Validated reliability for automotive powertrain and chassis modules requiring qualification evidence |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Meets OEM-level immunity requirements for 12 V and 24 V vehicle electrical systems |
Applications
| Industrial Power Supply Input Protection | Automotive ECU Power Rail Protection |
|---|---|
|
Use Scenario: 400 V DC input stage of industrial AC/DC converter exposed to lightning-induced surges and utility switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between DC bus and chassis ground to shunt >1 kV transients. Use Value: Clamps 10/1000 μs surges to ≤631 V, preventing damage to upstream rectifier and downstream PFC controller. |
Use Scenario: 24 V battery feed to engine control unit subjected to ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: High-power TVS on main power entry, triggered within <1 ps to limit overvoltage before regulator IC fails. Use Value: Absorbs up to 1500 W surge energy while maintaining VC below 631 V, protecting 40 V-rated LDOs and microcontrollers. |
| Telecom DC Feeder Protection | Renewable Energy Inverter DC Link |
|
Use Scenario: -48 V DC telecom power distribution board facing induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Unidirectional TVS on negative rail, referenced to ground, handling bidirectional threat via system grounding scheme. Use Value: Blocks 356 V steady-state while clamping 1 kV transients to 631 V, preserving -48 V system integrity and interface ICs. |
Use Scenario: 400–600 V DC link in solar string inverter exposed to grid-switching transients and capacitor discharge events. IC Role / Device Role / Timing Role: Parallel-connected TVS array on DC bus to share surge current and prevent overvoltage during rapid bus collapse. Use Value: Withstands repeated 1500 W pulses with minimal parameter shift, enabling long-term reliability in outdoor PV installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ440A | Same 440 V VBR, but SMC package (surface-mount); 1500 W rating; slightly higher VC = 645 V | Requires PCB rework for SMT assembly; unsuitable for through-hole legacy designs | Select when board space is constrained and reflow capability exists |
| ON Semiconductor 1N6299 | 150 V VBR (not 440 V); lower clamping voltage (215 V); same DO-201 package and 1500 W rating | Only suitable for ≤150 V systems; cannot replace 1.5KE440 in 400 V applications | Use only in lower-voltage industrial controls where VBR and VC match design thresholds |
Compared with SMAJ440A and 1N6299, the 1.5KE440 uniquely combines 440 V standoff, DO-201 through-hole compatibility, and 631 V clamping in a single industry-standard package-making it irreplaceable in high-voltage, leaded-board designs without layout change.
Availability
1.5KE440 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, telecom DC feeders, and renewable energy inverters requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE440 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global distribution and AEC-Q101 qualification capability.
The 1.5KE series was designed specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure-emphasizing rugged DO-201 packaging, precise VBR control, and ISO 7637-2 compliance.
FAQ
What is the breakdown voltage range for the 1.5KE440?
The 1.5KE440 has a guaranteed breakdown voltage range of 396 V to 484 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This 20% tolerance band ensures consistent clamping behavior across production lots while accommodating thermal and process variation. The 1.5KE440 must be verified against actual circuit overvoltage thresholds to confirm margin adequacy.
Is the 1.5KE440 unidirectional or bidirectional?
The 1.5KE440 is a unidirectional TVS diode, indicated by absence of "C" or "CA" suffix and explicit specification of cathode band marking. It conducts only in reverse bias during transients and blocks forward voltage like a standard rectifier. Bidirectional operation requires 1.5KE440C, which is not the same device as the 1.5KE440.
What is the maximum clamping voltage of the 1.5KE440 under surge conditions?
The 1.5KE440 clamps to a maximum of 631 V when subjected to its rated 2.4 A peak pulse current (IPP) under the standard 10/1000 μs waveform. This value is measured at TA = 25°C and defines the highest voltage imposed on protected circuitry during worst-case surge events.
Does the 1.5KE440 meet automotive qualification standards?
The base 1.5KE440 is not AEC-Q101 qualified; however, the variant 1.5KE440H (with "H" suffix) is explicitly qualified per AEC-Q101. Engineers specifying 1.5KE440 for automotive use must verify ordering code suffixes and obtain qualification documentation directly from Taiwan Semiconductor for the H-grade version.
What package type does the 1.5KE440 use, and what are its mechanical features?
The 1.5KE440 uses the DO-201 axial package: epoxy-molded, UL 94V-0 rated body with pure tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Its cathode band identifies polarity, and typical weight is 0.090 g-enabling manual or wave-solder assembly in high-reliability through-hole applications.
1.5KE440 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 356V
- Voltage - Breakdown (Min):
- 396V
- Voltage - Clamping (Max) @ Ipp:
- 631V
- Current - Peak Pulse (10/1000µs):
- 2.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE440 FAQ
1.How can I place an order for 1.5KE440 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE440 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 1.5KE440 reliable?
The price and inventory of 1.5KE440 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE440 is usually 5 days.
3.What payment methods are accepted for 1.5KE440?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE440 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE440?
1.5KE440 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE440 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 1.5KE440?
For technical support, including 1.5KE440 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE440 requirements.
6.How does Aetrix verify that 1.5KE440 is sourced from the original manufacturer or authorized distributors?
All 1.5KE440 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 1.5KE440 meets industry standards.
7.What is the process for return or replacement of 1.5KE440?
All 1.5KE440 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE440, 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 1.5KE440 part is unused and in its original packaging.
Return procedure for 1.5KE440:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE440 Tags
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