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Taiwan Semiconductor Corporation 1.5KE33
- Part No.:
- 1.5KE33
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33.pdf
- Description:
- 1500W, 33V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,186
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Product details
Overview
1.5KE33 from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 33 V, minimum VBR of 29.7 V at 1.0 mA test current, maximum clamping voltage of 47.7 V at 33 A peak pulse current, and DO-201 axial package - used for automotive load-dump and inductive switching surge protection in power supply inputs and DC bus lines.
For engineers reviewing the 1.5KE33 datasheet, 1.5KE33 pinout, 1.5KE33 application, or 1.5KE33 equivalent, key selection criteria include its 1500 W peak pulse power rating at 10/1000 µs, 47.7 V clamping performance under 33 A surge, -55 °C to +175 °C operating junction temperature range, and AEC-Q101 qualification availability in the 'A' variant (1.5KE33A).
Technical Context
The 1.5KE33 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 29.7–36.3 V breakdown range. It clamps transients to ≤47.7 V at 33 A while maintaining low dynamic impedance and sub-1 ps response time from 0 V to VBR.
Its DO-201 package supports 5 W steady-state dissipation at 75 °C lead temperature, handles 200 A non-repetitive forward surge (8.3 ms half-sine), and exhibits <1 µA leakage above 10 V - meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements for automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 29.7 V min / 36.3 V max - defines reliable avalanche initiation threshold under standard test conditions |
| VWM | 26.8 V - maximum continuous reverse working voltage before significant leakage begins |
| VC @ IPP = 33 A | 47.7 V - clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPK | 1500 W - peak pulse power handling capability per JEDEC standard waveform |
| Junction Temp Range | -55 °C to +175 °C - enables use in under-hood automotive and industrial power systems |
| Leakage @ VWM | <1 µA - ensures minimal standby power loss in always-on circuits |
| Response Time | <1.0 ps - enables suppression of ESD and fast-rising transients before damage occurs |
Pinout & Package
DO-201 axial-leaded package with cathode band marking; leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional clamp configuration |
| Cathode | Avalanche breakdown terminal | Connected to protected line (e.g., battery rail); polarity-marked band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W surge rating (10/1000 µs) | Supports robust protection against ISO 7637-2 load-dump pulses without derating in compact layout |
| <1 µA leakage @ VWM | Minimizes quiescent current impact in battery-powered or energy-sensitive applications |
| AEC-Q101 qualified option (1.5KE33A) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Clamping ratio VC/VBR ≈ 1.43 | Indicates efficient voltage limiting with low overvoltage margin relative to breakdown threshold |
| DO-201 mechanical robustness | UL 94V-0 molding compound and 0.090 g mass enable high-vibration mounting in engine control units |
Applications
| Automotive Power Input Protection | Industrial DC Bus Surge Suppression |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to ISO 7637-2 Pulse 5a (load dump up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before LDO/regulator stage. Use Value: Limits transient voltage to 47.7 V at 33 A, preventing overvoltage failure of downstream 40 V-rated power management ICs. |
Use Scenario: 24 V industrial PLC backplane subjected to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Standoff protector across DC bus rails, activated only during >26.8 V events to shunt energy to ground. Use Value: Absorbs 1500 W surge energy within 1 ms, avoiding bus collapse and maintaining logic supply stability. |
| LED Driver Overvoltage Clamp | Telecom Line Interface Protection |
Use Scenario: Constant-current LED driver in streetlight fixture experiencing lightning-induced surges on AC input rectifier output. IC Role / Device Role / Timing Role: Primary clamping device parallel to bulk capacitor, conducting only during overvoltage excursions. Use Value: Clamps 33 V nominal rail to ≤47.7 V, protecting 50 V-rated MOSFET switches and current-sense amplifiers. |
Use Scenario: Low-voltage telecom interface board receiving power over Ethernet (PoE) with potential induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS on DC-DC converter input, coordinated with primary GDT/gas tube protection. Use Value: Provides precise 26.8 V standoff and fast sub-ns response to complement slower primary protectors. |
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 SMAJ33A | Same DO-214AC (SMA) package; lower 400 W rating; VC = 53.3 V @ 7.5 A | Not suitable for 1500 W load-dump; limited to lower-energy ESD/EFM events | Select only if space-constrained PCB prohibits DO-201 and surge energy is ≤400 W |
| ON Semiconductor 1.5KE33A | Identical electrical specs and DO-201 package; AEC-Q101 qualified; same VBR, VC, PPK | Drop-in replacement where automotive qualification is mandatory and Taiwan Semiconductor stock is unavailable | Preferred for automotive programs requiring dual-source qualification; verify date code traceability |
Compared with 1.5KE33, SMAJ33A offers smaller footprint but sacrifices 63% peak power handling and higher clamping voltage, while 1.5KE33A delivers identical protection performance with certified automotive reliability - making it the only true functional and qualification-aligned alternative.
Availability
1.5KE33 is available at Aetrix Electronics and suitable for automotive power input protection, industrial DC bus surge suppression, LED driver overvoltage clamp, and telecom line interface protection requiring stable component supply across production lifecycles.
Supply support for 1.5KE33 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and consumer markets since 1979.
The 1.5KE series was designed specifically for high-energy transient suppression in harsh environments - emphasizing AEC-Q101 compliance, wide temperature operation, and robust DO-201 packaging for under-hood and factory-floor deployment.
FAQ
What is the maximum clamping voltage of the 1.5KE33 under rated surge conditions?
The 1.5KE33 has a maximum clamping voltage (VC) of 47.7 V when subjected to a 10/1000 µs surge current of 33 A. This value is measured per JEDEC standards and ensures protected circuitry remains below critical overvoltage thresholds during transient events such as load dump or inductive switching. The 1.5KE33 maintains this clamping performance across its full operating temperature range.
Is the 1.5KE33 unidirectional or bidirectional, and how is polarity identified?
1.5KE33 is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Polarity is marked by a cathode band on the DO-201 package body - the banded end connects to the protected line (e.g., battery rail), while the anode connects to ground. Bidirectional variants use "CA" suffixes (e.g., 1.5KE33CA), which 1.5KE33 does not carry.
Does the 1.5KE33 meet automotive qualification standards?
The base 1.5KE33 is not AEC-Q101 qualified; however, its variant 1.5KE33A is explicitly listed as AEC-Q101 qualified in Taiwan Semiconductor's documentation. For automotive applications requiring formal qualification, 1.5KE33A must be specified - it shares identical electrical parameters and DO-201 packaging but undergoes extended reliability testing per AEC-Q101 stress requirements.
What is the working stand-off voltage (VWM) of the 1.5KE33, and why does it matter?
The 1.5KE33 has a working stand-off voltage (VWM) of 26.8 V - the maximum DC or continuous reverse voltage that can be applied without triggering significant leakage (>1 µA). This parameter ensures the 1.5KE33 remains non-conductive during normal operation of a 24 V or 33 V system, preventing power loss or false triggering while still responding instantly to overvoltage transients exceeding this threshold.
How does the 1.5KE33 compare to the 1.5KE33A in terms of electrical performance?
The 1.5KE33 and 1.5KE33A share identical core electrical specifications: both have VBR = 29.7–36.3 V, VC = 47.7 V / 45.7 V respectively, and PPK = 1500 W. The 'A' suffix denotes AEC-Q101 qualification and tighter parametric screening - not electrical differentiation. Therefore, 1.5KE33A is a drop-in replacement where automotive reliability validation is required, and the 1.5KE33 remains suitable for industrial or commercial designs.
1.5KE33 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):
- 26.8V
- Voltage - Breakdown (Min):
- 29.7V
- Voltage - Clamping (Max) @ Ipp:
- 47.7V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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
1.5KE33 FAQ
1.How can I place an order for 1.5KE33 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33 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 1.5KE33 reliable?
The price and inventory of 1.5KE33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33 is usually 5 days.
3.What payment methods are accepted for 1.5KE33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33?
1.5KE33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33 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 1.5KE33?
For technical support, including 1.5KE33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33 requirements.
6.How does Aetrix verify that 1.5KE33 is sourced from the original manufacturer or authorized distributors?
All 1.5KE33 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 1.5KE33 meets industry standards.
7.What is the process for return or replacement of 1.5KE33?
All 1.5KE33 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33, 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 1.5KE33 part is unused and in its original packaging.
Return procedure for 1.5KE33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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