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Taiwan Semiconductor Corporation 1.5KE33A
- Part No.:
- 1.5KE33A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33A.pdf
- Description:
- TVS 1500W 33.1V 5% UNIDIR DO-201
- Quantity:
- Payment:
- Shipping:
Inventory:4,181
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Product details
Overview
1.5KE33A from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 33V, VBR min/max = 31.4V/34.7V at 1.0mA test current, VWM = 28.2V, and clamping voltage VC = 45.7V at 34A peak pulse current. It delivers fast transient suppression for automotive power-line protection in engine control units and body electronics.
For engineers reviewing the 1.5KE33A datasheet, 1.5KE33A pinout, 1.5KE33A application, or 1.5KE33A equivalent, key selection criteria include its DO-201 package, AEC-Q101 qualification, 10/1000μs surge rating, unidirectional polarity marking, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements.
Technical Context
The 1.5KE33A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 31.4–34.7V breakdown range. Its low dynamic impedance ensures rapid clamping response (<1.0ps from 0V to VBR) and limits transient energy dissipation across protected ICs.
It sustains 1500W non-repetitive peak pulse power per 10/1000μs waveform, derates linearly above 25°C ambient, and maintains <1μA leakage at 28.2V working stand-off voltage - enabling reliable operation in 12V/24V automotive systems without standby current penalty.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0mA | 31.4V min / 34.7V max - defines precise avalanche initiation threshold for accurate overvoltage triggering |
| VWM | 28.2V - maximum continuous reverse operating voltage; ensures no conduction during normal 12V/24V rail operation |
| VC @ IPP = 34A | 45.7V - clamped voltage under full 1500W surge; determines maximum stress on downstream ICs |
| PPK | 1500W - peak pulse power handling per 10/1000μs waveform; meets ISO 7637-2 Pulse 5a high-energy load dump |
| IR @ VWM | <1μA - ultra-low leakage preserves battery life in always-on automotive modules |
| Junction Temp Range | −55°C to +175°C - supports under-hood deployment in ECU, transmission control, and ADAS sensor nodes |
Pinout & Package
Package: DO-201 axial leaded package with cathode band marking; RoHS-compliant, halogen-free molding compound (UL 94V-0), pure tin-plated leads solderable per J-STD-002; weight ≈ 0.090g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path; enables unidirectional clamping from line-to-ground |
| Cathode | Avalanche breakdown terminal | Marked with band; connected to protected line (e.g., 12V supply); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per JEDEC standards |
| 10/1000μs surge capability | 1500W peak power rating meets ISO 7637-2 Pulse 5a (load dump) and Pulse 1 (inductive spike) requirements |
| Clamping ratio VC/VBR | 1.46 (45.7V / 31.4V) - low ratio minimizes voltage overshoot during transients, protecting 33V-tolerant interface ICs |
| Response time | <1.0ps - sub-picosecond turn-on ensures suppression before sensitive logic or analog circuitry is stressed |
| Leakage current | <1μA at 28.2V - negligible standby drain in always-on vehicle networks (e.g., CAN wake-up circuits) |
Applications
| Automotive Power Line Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Suppresses load dump transients (up to 120V, 400ms) on 12V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input; clamps within 1ps to limit voltage seen by LDOs and microcontrollers. Use Value: Prevents latch-up or gate oxide damage in 33V-rated power management ICs during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shields 24V digital input channels in programmable logic controllers from inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Line-to-ground TVS on field-side inputs; absorbs 10/1000μs spikes up to 1500W without degradation. Use Value: Eliminates need for external RC snubbers while maintaining IEC 61000-4-4 EFT immunity at 4kV contact discharge. |
| LED Driver Surge Suppression | Telecom Power Interface Protection |
Use Scenario: Protects constant-current LED driver ICs in automotive headlamps from alternator ripple and ignition noise. IC Role / Device Role / Timing Role: Mounted at driver input; clamps repetitive 100V/100ns spikes induced by brushless motor commutation. Use Value: Maintains <1μA leakage to avoid false dimming commands while surviving >10,000 surge events per MIL-STD-883H Method 3015.8. |
Use Scenario: Safeguards PoE-powered Ethernet switch ports against lightning-induced surges on 48V DC feed lines. IC Role / Device Role / Timing Role: Primary protection stage upstream of DC-DC converter; handles 10/1000μs surges per IEC 61000-4-5 Level 4 (4kV). Use Value: Enables single-stage protection architecture with VC = 45.7V ensuring downstream 50V-rated MOSFETs remain within SOA limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | 600W rating, DO-214AA package, VC = 53.3V @ 11.8A - lower power, higher clamping voltage | Best suited for space-constrained PCBs where 1500W surge is not required | Select SMBJ33A only if system-level testing confirms 600W surge margin is sufficient and board layout allows SMD placement |
| 1N6283A | Same electrical specs and DO-201 package; JEDEC type number for 1.5KE33A - identical performance and form factor | No functional difference; used interchangeably in BOMs per Taiwan Semiconductor's ordering documentation | 1N6283A is a direct JEDEC-equivalent marking; no design change required when substituting for 1.5KE33A |
Compared with SMBJ33A, the 1.5KE33A delivers 2.5× higher surge power and 7.6V lower clamping voltage - critical for protecting 33V-rated power stages. Compared with 1N6283A, it is functionally identical but uses manufacturer-specific branding; both share identical DO-201 mechanicals and AEC-Q101 qualification.
Availability
1.5KE33A is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input conditioning, and LED driver surge protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1.5KE33A 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 automotive and industrial certifications.
The 1.5KE series was designed specifically for high-energy transient suppression in harsh automotive environments, targeting ISO 7637-2 compliance and AEC-Q101 qualification for under-hood and chassis-mounted electronics.
FAQ
What is the polarity configuration of the 1.5KE33A?
The 1.5KE33A is a unidirectional TVS diode with cathode band marking. It conducts only during reverse-biased overvoltage events - i.e., when the cathode is at higher potential than the anode - making it ideal for line-to-ground protection on positive-rail systems like automotive 12V/24V supplies. This polarity prevents forward conduction during normal operation, ensuring zero standby current beyond specified leakage.
Does the 1.5KE33A meet AEC-Q101 requirements?
Yes, the 1.5KE33A is explicitly AEC-Q101 qualified per Taiwan Semiconductor's documentation. It undergoes stress testing including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock per JEDEC standards, validating its suitability for automotive powertrain, body control, and ADAS applications where reliability under thermal and vibration stress is mandatory.
What is the clamping voltage of the 1.5KE33A under full-rated surge current?
The 1.5KE33A clamps to a maximum of 45.7V at 34A peak pulse current (IPP), corresponding to its full 1500W 10/1000μs surge rating. This value is measured per standard test conditions (TA = 25°C) and defines the upper voltage limit imposed on protected circuitry during worst-case transients - critical for verifying compatibility with 33V-rated downstream components.
Can the 1.5KE33A be used in bidirectional configurations?
No, the 1.5KE33A is strictly unidirectional and lacks symmetrical breakdown characteristics. For bidirectional protection, Taiwan Semiconductor specifies CA-suffixed variants (e.g., 1.5KE33CA) which feature back-to-back diode construction. Using the 1.5KE33A in AC or floating-line applications risks failure due to forward conduction during negative half-cycles.
What packaging options are available for the 1.5KE33A?
The 1.5KE33A is supplied in DO-201 axial package with two standard packing formats: 1,250 units per tape-and-reel (ordering code 1.5KE33A) and 500 units per ammo box (ordering code 1.5KE33AA0G). Both options use RoHS-compliant, halogen-free molding compound and pure tin-plated leads meeting J-STD-002 solderability requirements.
1.5KE33A 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):
- 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
1.5KE33A FAQ
1.How can I place an order for 1.5KE33A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33A 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 1.5KE33A reliable?
The price and inventory of 1.5KE33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33A is usually 5 days.
3.What payment methods are accepted for 1.5KE33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33A?
1.5KE33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33A 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 1.5KE33A?
For technical support, including 1.5KE33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33A requirements.
6.How does Aetrix verify that 1.5KE33A is sourced from the original manufacturer or authorized distributors?
All 1.5KE33A 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 1.5KE33A meets industry standards.
7.What is the process for return or replacement of 1.5KE33A?
All 1.5KE33A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33A, 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 1.5KE33A part is unused and in its original packaging.
Return procedure for 1.5KE33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33A Tags
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