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Vishay General Semiconductor - Diodes Division 1.5KE33A-E3/51
- Part No.:
- 1.5KE33A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33A-E3/51.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:5,506
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Product details
Overview
1.5KE33A-E3/51 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for primary overvoltage protection of sensitive electronics. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1.0 mA), 45.7 V maximum clamping voltage at 32.8 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in power supply input stages, DC bus lines, and industrial sensor interfaces.
For engineers reviewing the 1.5KE33A-E3/51 datasheet, 1.5KE33A-E3/51 pinout, 1.5KE33A-E3/51 application, or 1.5KE33A-E3/51 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant packaging details, and direct alternative part comparisons for ESD and lightning transient protection design.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds its breakdown threshold (31.4–34.7 V), it rapidly transitions to low-impedance conduction, limiting downstream voltage to ≤45.7 V at 32.8 A. Its glass-passivated junction enables sub-nanosecond response time and stable leakage (<1.0 µA at 28.2 V stand-off).
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15.4 °C/W, supporting operation up to TJ = 175 °C. The device sustains 200 A non-repetitive forward surge (8.3 ms half-sine) and dissipates 6.5 W continuously on infinite heatsink at TL = 75 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - defines precise clamping onset threshold for reliable overvoltage detection |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage rises above 1.0 µA |
| VC @ IPPM | 45.7 V at 32.8 A - limits protected circuit voltage during 10/1000 µs transients |
| PPPM | 1500 W - peak surge power handling capability per single 10/1000 µs pulse |
| IFSM | 200 A - withstands 8.3 ms half-sine surge without failure, critical for AC line surges |
| TJ max. | 175 °C - enables use in high-ambient industrial and automotive under-hood environments |
| RθJL | 15.4 °C/W - low junction-to-lead thermal resistance supports PCB copper pour heat sinking |
Pinout & Package
Package: DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., +12 V rail); color band identifies this end for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime |
| 1500 W peak pulse power (10/1000 µs) | Protects against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12–48 V systems |
| Sub-nanosecond response time | Clamps transients before IC damage occurs - faster than MOVs or polymer-based protectors |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance; suitable for lead-free reflow and wave soldering |
| UL 497B recognized (QVGQ2) | Validated for telecom and industrial signal line protection per safety-critical applications |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input channels in programmable logic controllers exposed to relay coil flyback and field wiring inductive spikes. IC Role / Device Role: Primary shunt TVS placed between channel and ground to clamp transients before reaching isolation amplifiers or microcontrollers. Use Value: Limits voltage to ≤45.7 V during 32.8 A surges, preventing latch-up or gate oxide rupture in downstream 3.3 V/5 V logic. | Use Scenario: Power supply input to BCM modules subjected to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role: Front-end unidirectional TVS on main 12 V rail, upstream of DC-DC converters and CAN transceivers. Use Value: Absorbs 1500 W pulses without degradation, maintaining system uptime during battery disconnection events. |
| Telecom Power Feeds | Consumer Appliance Motor Drivers |
Use Scenario: -48 V DC power feeds in remote radio units and DSLAM line cards vulnerable to lightning-induced surges on long copper runs. IC Role / Device Role: Reverse-polarity protected TVS on feed line, combined with series fuse and PTC for coordinated protection. Use Value: Clamps induced surges to safe levels while sustaining 175 °C junction temperature in sealed outdoor enclosures. | Use Scenario: H-bridge gate driver supply rails in washing machine motor control boards exposed to brush-commutator noise and back-EMF. IC Role / Device Role: Local TVS on 15 V gate drive supply, placed adjacent to driver IC to minimize loop inductance. Use Value: Sub-ns response prevents false triggering or shoot-through caused by fast-rising transients on gate nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | DO-214AA package; lower PPPM = 600 W; VC = 53.3 V @ 11.3 A | Compact surface-mount footprint; suited for space-constrained consumer PCBs, not high-energy industrial surges | Select SMBJ33A only if surge energy is limited to IEC 61000-4-5 Level 2 and board area is constrained. |
| 1.5KE33CA | Bidirectional variant; same VBR, VC, and PPPM; symmetrical clamping for AC or floating lines | Required for differential signal lines (e.g., RS-485), transformer-coupled interfaces, or AC mains inputs | Choose 1.5KE33CA when protecting bidirectional signals or circuits without defined polarity reference. |
Compared with SMBJ33A and 1.5KE33CA, the 1.5KE33A-E3/51 offers superior surge energy handling in through-hole form factor and unidirectional clamping optimized for DC power rail protection - making it preferred for industrial power entry and automotive supply filtering where robustness and thermal margin are critical.
Availability
1.5KE33A-E3/51 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for 1.5KE33A-E3/51 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
Vishay General Semiconductor designs and manufactures discrete semiconductors including diodes, rectifiers, and transient suppressors with emphasis on reliability, ruggedness, and application-specific performance.
The 1.5KE series was developed for high-energy transient suppression in harsh environments - targeting industrial controls, automotive subsystems, and telecom power systems where failure due to voltage surges must be prevented.
FAQ
What is the breakdown voltage tolerance of the 1.5KE33A-E3/51?
The 1.5KE33A-E3/51 has a specified breakdown voltage range of 31.4 V to 34.7 V at 1.0 mA test current, representing ±5.2% tolerance around the nominal 33 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports predictable overvoltage trip points in protection circuits using the 1.5KE33A-E3/51.
Is the 1.5KE33A-E3/51 RoHS compliant and lead-free solder compatible?
Yes, the 1.5KE33A-E3/51 carries the E3 suffix indicating full RoHS compliance and qualification to JESD 201 Class 1A whisker resistance. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, supporting both lead-free reflow (peak 260 °C) and wave soldering processes without degradation of the 1.5KE33A-E3/51's electrical performance.
How does the 1.5KE33A-E3/51 compare to metal-oxide varistors (MOVs) for surge protection?
The 1.5KE33A-E3/51 offers faster response (<1 ns vs. ~20–50 ns for MOVs), tighter voltage clamping (45.7 V vs. ≥60 V typical for MOVs), and no degradation after repeated surges - unlike MOVs which wear out. While MOVs handle higher total energy, the 1.5KE33A-E3/51 excels in precision clamping of fast, high-amplitude transients where protecting sensitive 3.3 V/5 V ICs is critical, making it the preferred choice upstream of IC-level protection when using the 1.5KE33A-E3/51.
Can the 1.5KE33A-E3/51 be used in parallel to increase surge current handling?
Yes, multiple 1.5KE33A-E3/51 devices can be paralleled to increase total peak pulse current capacity, but matching VBR within ±3% is required to ensure balanced current sharing. Layout must minimize parasitic inductance differences - identical trace lengths and symmetric placement are essential. Derating by 20% per added device is recommended; for example, two 1.5KE33A-E3/51 units support ~52 A total IPPM instead of 65.6 A ideal.
What is the maximum operating temperature and thermal resistance of the 1.5KE33A-E3/51?
The 1.5KE33A-E3/51 has a maximum junction temperature of 175 °C and thermal resistance values of RθJA = 75 °C/W (junction-to-ambient) and RθJL = 15.4 °C/W (junction-to-lead). When mounted on 1 in² of 2 oz copper with two thermal vias, the 1.5KE33A-E3/51 achieves practical RθJA ≈ 40 °C/W, enabling reliable operation at full 6.5 W dissipation in 70 °C ambient environments.
1.5KE33A-E3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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):
- 32.8A
- 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:
- 1.5KE
1.5KE33A-E3/51 FAQ
1.How can I place an order for 1.5KE33A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33A-E3/51 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-E3/51 reliable?
The price and inventory of 1.5KE33A-E3/51 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-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE33A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33A-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33A-E3/51?
1.5KE33A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33A-E3/51 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-E3/51?
For technical support, including 1.5KE33A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33A-E3/51 requirements.
6.How does Aetrix verify that 1.5KE33A-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE33A-E3/51 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-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE33A-E3/51?
All 1.5KE33A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33A-E3/51, 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-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE33A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33A-E3/51 Tags
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