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Diodes Incorporated 1.5KE33CA-T
- Part No.:
- 1.5KE33CA-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33CA-T.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:5,870
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Product details
Overview
1.5KE33CA-T from Diodes Incorporated is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for overvoltage protection of DC power rails and signal lines. It features a 33V reverse standoff voltage (VRWM), 45.7V maximum clamping voltage at 33A peak pulse current, and fast response time for ESD and surge suppression in industrial and automotive electronics.
For engineers reviewing the 1.5KE33CA-T datasheet, 1.5KE33CA-T pinout, 1.5KE33CA-T application, or 1.5KE33CA-T equivalent, this page delivers verified electrical parameters, DO-201 terminal mapping, clamping performance under IEC 61000-4-5 surge conditions, and direct alternatives with validated voltage and power ratings.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection without polarity dependency in AC-coupled or floating interfaces. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5 µA at VRWM) over temperature.
The device meets IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity requirements when properly mounted with minimal trace inductance. Its 1.12g axial-leaded DO-201 package supports manual or wave soldering per MIL-STD-202 Method 208.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms 10/1000µs waveform - sustains high-energy transients without failure |
| Reverse Standoff Voltage (VRWM) | 33V - maximum continuous operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 31.4–34.7V @ 1.0mA - tight tolerance ensures predictable turn-on threshold |
| Max Clamping Voltage (VC) | 45.7V @ 33A IPP - limits protected circuit voltage to safe level during surge |
| Peak Pulse Current (IPP) | 33A - quantifies maximum surge current the device can shunt without degradation |
| Operating Temperature | −55°C to +175°C - suitable for under-hood automotive and industrial environments |
| Leakage Current (IR) | ≤5.0µA @ 33V - negligible standby power loss and minimal impact on high-impedance circuits |
Pinout & Package
Package: DO-201 axial-leaded epoxy package (UL 94V-0 rated), 25.4mm overall length, 8.5–9.53mm body diameter, 4.8–5.21mm lead spacing. Leads are tin-finished, solderable, and mechanically robust for through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Current entry point in forward bias; common node in bidirectional clamping | Connected to line being protected; forms symmetrical clamp path with Cathode |
| Cathode (Lead 2) | Current exit point in forward bias; common node in bidirectional clamping | Connected to reference (e.g., ground or rail); completes low-impedance surge path |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures stable VBR over life and improved reliability vs. epoxy-passivated alternatives |
| Bidirectional configuration (suffix 'C') | Protects AC signals or floating buses without polarity constraints or external diode pairing |
| RoHS-compliant, halogen-free "Green" finish | Meets automotive and industrial environmental compliance (Br+Cl <1500ppm, Sb <1000ppm) |
| Fast response time (<1.0ps) | Clamps transients before downstream ICs experience damaging overvoltage |
| 1.0ms 10/1000µs waveform rating | Validated for IEC 61000-4-5 Level 4 (4kV) surge immunity testing |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24V CAN bus transceivers and LIN interfaces against load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across differential bus lines or supply-to-ground. Use Value: Limits transient voltage to ≤45.7V during 33A surges, preventing damage to ISO 11898-compliant transceivers. |
Use Scenario: Input rail protection for microcontrollers and sensor interfaces exposed to battery transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V/24V power input before LDO or DC-DC converter. Use Value: Withstands 1500W pulses per ISO 7637-2 Pulse 5a, maintaining system uptime during cold-crank events. |
| AC-DC Power Supply Inputs | Telecom Line Interface Cards |
Use Scenario: Secondary-side DC bus protection in industrial SMPS after rectification and bulk capacitance. IC Role / Device Role / Timing Role: Parallel-connected TVS across +VOUT and GND to absorb switching noise and lightning-induced surges. Use Value: Clamps 33A surges within 45.7V, preserving output regulation and preventing MOSFET gate oxide breakdown. |
Use Scenario: Overvoltage protection on analog subscriber line interface (SLIC) inputs in VoIP gateways. IC Role / Device Role / Timing Role: Bidirectional clamp between tip/ring lines and ground to suppress induced lightning surges. Use Value: Symmetric 33V standoff enables protection of balanced AC-coupled telecom lines without polarity biasing. |
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 | 600W rating, SMB surface-mount package, same 33V VRWM and bidirectional configuration | Lower power handling; suited for PCB space-constrained designs with lower surge exposure | Select when board area is limited and peak surge energy does not exceed 600W |
| 1.5SMC33CA | Same 1500W rating and DO-201 equivalent, but SMC package (larger than DO-201, higher thermal mass) | Improved thermal dissipation for repetitive surge duty cycles; requires larger footprint | Select when operating ambient exceeds 75°C or surge repetition rate is >1/min |
Compared with 1.5KE33CA-T, SMBJ33CA offers compactness at reduced surge capacity, while 1.5SMC33CA trades DO-201 compatibility for enhanced thermal robustness-enabling selection based on mechanical layout, thermal budget, and surge repetition profile.
Availability
1.5KE33CA-T is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and AC-DC power supply inputs requiring stable component supply and long-term obsolescence management.
Supply support for 1.5KE33CA-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and distribution operations across Asia, Europe, and the Americas.
The 1.5KE series is part of Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability overvoltage protection in automotive, industrial, and telecom infrastructure where robustness against IEC 61000-4-2/4-5 events is critical.
FAQ
Is 1.5KE33CA-T still in active production?
No-1.5KE33CA-T is marked obsolete by Diodes Incorporated as of May 2023 (DS21503 Rev. 12). Aetrix Electronics maintains legacy inventory with full traceability and provides last-time-buy support, including extended warranty and documentation packages for ongoing production programs.
What is the difference between 'A' and 'CA' suffixes in the 1.5KE series?
The 'A' suffix denotes unidirectional TVS diodes (anode-cathode polarity), while 'CA' indicates bidirectional devices with symmetrical breakdown in both directions. For 1.5KE33CA-T, this means clamping occurs at ±33V standoff, making it ideal for AC or floating signal lines without polarity concerns.
Can 1.5KE33CA-T replace 1.5KE33A in an existing design?
No-1.5KE33CA-T is bidirectional; 1.5KE33A is unidirectional. Substitution requires verifying circuit topology: if the original design relies on forward-bias conduction or uses a single-polarity rail, replacing with a bidirectional device may cause unintended conduction or fail to clamp correctly during negative transients.
What is the maximum allowable lead temperature during soldering?
The DO-201 package supports soldering per MIL-STD-202 Method 208, with peak lead temperature up to 260°C for 10 seconds. Exceeding this risks internal bond wire damage or epoxy delamination; preheating to 150°C and limiting dwell time preserves glass-passivated junction integrity.
1.5KE33CA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 33A
- 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-T FAQ
1.How can I place an order for 1.5KE33CA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33CA-T 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-T reliable?
The price and inventory of 1.5KE33CA-T 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-T is usually 5 days.
3.What payment methods are accepted for 1.5KE33CA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33CA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33CA-T?
1.5KE33CA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33CA-T 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-T?
For technical support, including 1.5KE33CA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33CA-T requirements.
6.How does Aetrix verify that 1.5KE33CA-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE33CA-T 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-T meets industry standards.
7.What is the process for return or replacement of 1.5KE33CA-T?
All 1.5KE33CA-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33CA-T, 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-T part is unused and in its original packaging.
Return procedure for 1.5KE33CA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33CA-T Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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