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Taiwan Semiconductor Corporation 1.5KE33CA
- Part No.:
- 1.5KE33CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33CA.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
1.5KE33CA from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, with nominal breakdown voltage 33V, working stand-off voltage 26.8V, clamping voltage 45.7V at 34A peak impulse current, and fast response time <5.0ns - designed for ESD and electrical fast transient protection in automotive power rails and industrial control I/O interfaces.
For engineers reviewing the 1.5KE33CA datasheet, 1.5KE33CA pinout, 1.5KE33CA application, or 1.5KE33CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, low dynamic impedance, and DO-201 mechanical compatibility with high-surge PCB layouts.
Technical Context
The 1.5KE33CA operates as a bidirectional avalanche diode, triggering symmetrically in both polarities above its 31.4–34.7V breakdown range (tested at 1mA), delivering sub-5ns response to transients while maintaining ≤1μA leakage at 26.8V working voltage. Its junction temperature rating extends from –55°C to +175°C, supporting under-hood automotive deployment.
It sustains 1500W non-repetitive peak pulse power per 10/1000μs waveform, with clamping voltage limited to 45.7V at 34A IPP - enabling robust protection of 24V/32V systems against load dump and inductive switching spikes without compromising downstream IC voltage tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Voltage | 33 V - defines rated standoff level for 24V system rail protection |
| Breakdown Voltage VBR | 31.4–34.7 V @ 1 mA - ensures reliable conduction onset before damage threshold of protected circuitry |
| Working Stand-off Voltage VWM | 26.8 V - maximum continuous reverse voltage without significant leakage |
| Clamping Voltage VC | 45.7 V @ 34 A IPP - limits transient voltage seen by downstream components during surge events |
| Peak Pulse Power PPK | 1500 W - handles severe ISO 7637-2 Pulse 5a (load dump) surges in automotive environments |
| Junction Temperature Range | –55°C to +175°C - supports operation in engine compartment and industrial enclosures |
| Response Time | <5.0 ns - enables suppression of fast EFT bursts (IEC 61000-4-4) before IC latch-up |
Pinout & Package
Package: DO-201 axial leaded case with cathode band marking (bidirectional symmetry means no polarity-dependent orientation; cathode band denotes terminal identification per JEDEC standard, but functional behavior is identical in both directions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry (negative polarity) | Conducts during negative transients; forms symmetrical clamp path with Cathode |
| Cathode (Lead 2, banded end) | Transient current entry (positive polarity) | Conducts during positive transients; completes bidirectional clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per JESD22 |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) immunity requirements |
| Bidirectional clamping | Identical VBR and VC performance in both polarities - eliminates need for dual-diode arrangements |
| Low dynamic impedance | Enables tight clamping window (VC – VBR ≈ 12.3 V) for precise overvoltage limiting |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Suppressing load dump transients on 24V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across power input to clamp voltage excursions above 45.7V within nanoseconds. Use Value: Prevents permanent damage to DC-DC converters and microcontrollers during alternator regulation failure. |
Use Scenario: Shielding 24V digital input channels in programmable logic controllers from field-wiring EFT and inductive kickback. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on signal lines interfacing with solenoids, relays, and sensors. Use Value: Maintains signal integrity and prevents false triggering or reset events during factory floor electromagnetic noise exposure. |
| LED Driver Overvoltage Clamp | Telecom Power Interface Surge Guard |
Use Scenario: Protecting constant-current LED driver ICs from line surges in streetlight and signage applications. IC Role / Device Role / Timing Role: Parallel-connected TVS limiting input voltage to safe levels during lightning-induced surges on AC/DC supply inputs. Use Value: Extends LED system lifetime by preventing catastrophic failure of MOSFETs and current-sense amplifiers. |
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras, access points) connected to outdoor Ethernet cabling. IC Role / Device Role / Timing Role: First-stage protector on 48V DC input, absorbing induced surges before they reach DC-DC and PHY ICs. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (1kV/2kV) surge immunity without additional MOV stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA (Bourns) | 600W rating, SMB surface-mount package, lower IPP (18.3A), same VBR range (31.4–34.7V) | Not suitable for high-energy load dump; intended for board-level ESD, not chassis-level surges | Select when space-constrained layout requires SMT and surge energy is ≤600W |
| P6SMB33CA (ON Semiconductor) | 600W rating, SMB package, slightly higher VC (49.3V @ 12.5A), same DO-201–equivalent VBR spec | Lacks AEC-Q101 qualification and ISO 7637-2 validation; limited to commercial-grade systems | Choose only for cost-sensitive non-automotive designs where 1500W headroom is unnecessary |
Compared with SMBJ33CA and P6SMB33CA, the 1.5KE33CA delivers 2.5× higher surge power handling, proven AEC-Q101 reliability, and full ISO 7637-2 immunity coverage - making it the sole option for under-hood automotive and heavy-industrial 24V rail protection where single-event energy exceeds 600W.
Availability
1.5KE33CA is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, LED driver overvoltage clamp, and telecom PoE interface surge guard requiring stable component supply across extended temperature and high-reliability programs.
Supply support for 1.5KE33CA 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, rectifiers, and thyristors - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 validation capabilities.
The 1.5KE series was engineered specifically for high-energy transient suppression in automotive and industrial environments, emphasizing rugged DO-201 packaging, wide temperature operation, and full ISO 7637-2 compliance - not general-purpose ESD protection.
FAQ
What is the clamping voltage of the 1.5KE33CA at its rated peak pulse current?
The 1.5KE33CA has a maximum clamping voltage (VC) of 45.7 V at 34 A peak impulse current (IPP), measured under the standard 10/1000 μs double-exponential surge waveform. This value ensures protected circuits remain below critical overvoltage thresholds during high-energy transients such as automotive load dump. The 1.5KE33CA maintains this clamping performance consistently across its operating temperature range.
Is the 1.5KE33CA unidirectional or bidirectional, and how is polarity identified?
The 1.5KE33CA is a bidirectional TVS diode - it provides symmetrical clamping for both positive and negative transients, with identical breakdown and clamping characteristics in either direction. Although it features a cathode band per DO-201 mechanical standard, this marking does not indicate functional polarity; the 1.5KE33CA performs identically regardless of installation orientation.
Does the 1.5KE33CA meet AEC-Q101 requirements for automotive use?
Yes, the 1.5KE33CA is explicitly AEC-Q101 qualified, as confirmed in Taiwan Semiconductor's official documentation and ordering code suffix "H" (e.g., 1.5KE33CAH). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD per JESD22, validating suitability for under-hood and chassis-mounted automotive applications.
What standards does the 1.5KE33CA comply with for transient immunity?
The 1.5KE33CA meets ISO 7637-2 requirements for automotive transient immunity, covering Pulse 1 (inductive load disconnect), Pulse 2a/2b (supply line switching), and Pulse 3a/3b (capacitive coupling EFT). It also complies with RoHS Directive 2011/65/EU and IEC 61249-2-21 for halogen-free construction - all verified in Taiwan Semiconductor's O2104 datasheet revision.
How does the 1.5KE33CA differ from the 1.5KE33C variant?
The 1.5KE33CA includes the "A" suffix indicating tighter parameter tolerances: its breakdown voltage range is 31.4–34.7 V (vs. 29.7–36.3 V for 1.5KE33C), and its clamping voltage is 45.7 V (vs. 47.7 V for 1.5KE33C). Both share DO-201 packaging and bidirectional functionality, but the 1.5KE33CA offers improved consistency for precision-critical protection schemes.
1.5KE33CA 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 34A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE33CA FAQ
1.How can I place an order for 1.5KE33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33CA 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 1.5KE33CA reliable?
The price and inventory of 1.5KE33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33CA is usually 5 days.
3.What payment methods are accepted for 1.5KE33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33CA?
1.5KE33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33CA 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 1.5KE33CA?
For technical support, including 1.5KE33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33CA requirements.
6.How does Aetrix verify that 1.5KE33CA is sourced from the original manufacturer or authorized distributors?
All 1.5KE33CA 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 1.5KE33CA meets industry standards.
7.What is the process for return or replacement of 1.5KE33CA?
All 1.5KE33CA units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33CA, 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 1.5KE33CA part is unused and in its original packaging.
Return procedure for 1.5KE33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33CA Tags
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