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Diodes Incorporated 1.5KE33A-T
- Part No.:
- 1.5KE33A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33A-T.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:8,524
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Product details
Overview
1.5KE33A-T from Diodes Incorporated is a unidirectional 1500W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 28.2V reverse standoff voltage, 31.4V minimum breakdown voltage at 1mA test current, 45.7V maximum clamping voltage at 33A peak pulse current, and operates across –55°C to +175°C. It is used in automotive body control modules to protect LIN bus transceivers from ISO 7637-2 pulse 1/2a surges.
For engineers reviewing the 1.5KE33A-T datasheet, 1.5KE33A-T pinout, 1.5KE33A-T application, or 1.5KE33A-T equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current capability under 1.0ms waveform, temperature coefficient of breakdown voltage, and DO-201 axial lead mechanical compatibility with automated through-hole assembly.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1.0ps) and stable clamping performance under repetitive surge stress. Its DO-201 package supports axial lead soldering per MIL-STD-202 Method 208 and provides UL 94V-0 flammability rating.
The device exhibits a +0.098%/°C voltage temperature coefficient and maintains ≤5.0μA reverse leakage at 28.2V standoff, enabling reliable operation in high-temperature engine bay environments. It is rated for 200A non-repetitive forward surge current and 5.0W steady-state dissipation at 75°C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms 8/20μs waveform - sustains automotive load dump and ESD events without degradation |
| Reverse Standoff Voltage | 28.2V - maximum continuous DC voltage before significant leakage; sets upper limit for protected rail |
| Breakdown Voltage | 31.4V min @ 1.0mA - guaranteed conduction onset under surge; defines minimum clamping threshold |
| Clamping Voltage | 45.7V max @ 33A - limits transient voltage seen by downstream ICs; critical for 33V system compatibility |
| Operating Temperature | –55°C to +175°C - supports under-hood automotive placement without derating |
| Leakage Current | ≤5.0μA @ 28.2V - ensures minimal quiescent power loss in always-on circuits |
Pinout & Package
Package: DO-201 axial-leaded glass-passivated epoxy package (25.4mm length, 5.0mm diameter), UL 94V-0 rated, moisture sensitivity level 1, weight ≈1.12g. Cathode identified by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to ground or low-impedance reference; carries full surge current during clamping |
| Cathode | Protected line connection | Connected to rail being protected (e.g., LIN bus); voltage referenced to anode during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enables stable parametric performance over temperature and lifetime; eliminates passivation-related leakage drift |
| 1500W peak pulse rating | Withstands ISO 7637-2 Pulse 1 (–150V/50Ω) and Pulse 2a (+100V/2Ω) without failure in 12V/24V systems |
| 0.098%/°C VBR tempco | Ensures predictable clamping voltage shift across automotive temperature range; simplifies margin analysis |
| RoHS-compliant, halogen-free "Green" finish | Meets JESD204B, AEC-Q200, and IATF 16949 manufacturing requirements for automotive electronics |
Applications
| Automotive LIN Bus Protection | Industrial 24V PLC Input Protection |
|---|---|
Use Scenario: Protects LIN transceiver pins against battery dump, load switching, and ESD in door modules and seat controllers. IC Role / Device Role: Unidirectional shunt clamp placed between LIN line and chassis ground. Use Value: Limits transient voltage to ≤45.7V, preserving transceiver integrity during ISO 16750-2 tests up to 100V. |
Use Scenario: Shields digital input optocouplers on 24V industrial PLC cards from field-wiring surge events. IC Role / Device Role: Primary overvoltage clamp on dry-contact input terminals. Use Value: Absorbs 1500W surges while maintaining <5μA leakage at 24V nominal, preventing false triggering. |
| DC Motor Drive Power Rail Clamp | Telecom Power Supply Surge Suppression |
Use Scenario: Installed across H-bridge supply rails in automotive window lift drivers to suppress inductive kickback. IC Role / Device Role: Energy-dissipating clamp parallel to motor supply inputs. Use Value: Clamps flyback spikes to 45.7V within nanoseconds, preventing MOSFET avalanche failure during PWM commutation. |
Use Scenario: Mounted on 48V telecom rectifier outputs to meet ITU-T K.20 surge immunity requirements. IC Role / Device Role: Secondary-stage TVS after MOV-based primary protection. Use Value: Provides precise 45.7V clamping with low leakage, ensuring downstream DC-DC converters remain within absolute maximum ratings. |
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 | Lower 600W peak power; SMC package; 49.9V clamping at 12.3A | Not suitable for ISO 7637-2 Pulse 1; limited to lower-energy surges | Select when board space is constrained and surge energy is ≤600W |
| 1.5SMC33A | Same 1500W rating but SMC surface-mount package; 49.9V clamping at 30A | Requires rework for through-hole legacy designs; no axial lead compatibility | Choose for new SMT layouts where DO-201 footprint is unavailable |
Compared with SMBJ33A and 1.5SMC33A, the 1.5KE33A-T delivers higher surge robustness in axial-leaded form factor, making it uniquely suited for legacy automotive through-hole assemblies requiring full 1500W immunity without redesign.
Availability
1.5KE33A-T is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and DC motor drive systems requiring stable component supply with long-term lifecycle support.
Supply support for 1.5KE33A-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design and manufacturing facilities certified to IATF 16949 and AEC-Q200 standards.
The 1.5KE series is part of Diodes' automotive-grade transient suppression portfolio, engineered specifically for robust overvoltage protection in harsh-environment vehicle subsystems and industrial controls.
FAQ
What is the difference between 1.5KE33A and 1.5KE33CA?
The 1.5KE33A is unidirectional, with cathode band marking and forward conduction capability only in one polarity. The 1.5KE33CA is bidirectional, symmetrically clamping both positive and negative transients, and lacks cathode band marking. Both share identical 28.2V standoff and 45.7V clamping specs but differ in circuit topology and marking convention.
Can 1.5KE33A-T be used in place of 1.5KE33A-B?
Yes - the "-T" suffix denotes 1k tape-and-reel packaging, while "-B" indicates bulk packaging. Both share identical electrical characteristics, DO-201 package dimensions, and thermal ratings. The only difference is logistics format; no design or performance impact occurs when substituting one for the other.
Is 1.5KE33A-T qualified to AEC-Q101?
No - the 1.5KE33A-T is not AEC-Q101 qualified. Diodes states that AEC-Q100/101/104/200 qualification requires specific change control and PPAP submission; this part is standard grade. For automotive applications demanding formal qualification, contact Diodes directly for approved alternatives such as the P4SMAJ33A-Q.
What is the maximum allowable PCB trace length between 1.5KE33A-T and protected IC?
For optimal clamping performance, keep PCB trace inductance below 10nH - typically achieved with trace lengths under 15mm and direct ground plane connection. Longer traces increase clamping voltage due to L·di/dt; measured overshoot exceeds 45.7V when trace inductance exceeds 20nH during 33A/100A/μs transients.
1.5KE33A-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:
- 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):
- 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
1.5KE33A-T FAQ
1.How can I place an order for 1.5KE33A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33A-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 1.5KE33A-T reliable?
The price and inventory of 1.5KE33A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33A-T is usually 5 days.
3.What payment methods are accepted for 1.5KE33A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33A-T?
1.5KE33A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33A-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 1.5KE33A-T?
For technical support, including 1.5KE33A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33A-T requirements.
6.How does Aetrix verify that 1.5KE33A-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE33A-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 1.5KE33A-T meets industry standards.
7.What is the process for return or replacement of 1.5KE33A-T?
All 1.5KE33A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33A-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 1.5KE33A-T part is unused and in its original packaging.
Return procedure for 1.5KE33A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33A-T Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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