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Vishay General Semiconductor - Diodes Division 1.5KA33AHE3/51
- Part No.:
- 1.5KA33AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA33AHE3/51.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:6,513
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Product details
Overview
1.5KA33AHE3/51 from Vishay General Semiconductor is an automotive-grade unidirectional transient voltage suppressor (TVS) diode in the 1.5KA case style, rated for 1500 W peak pulse power (10/1000 µs), 31.4 V breakdown voltage (min), 45.7 V clamping voltage at 32.8 A, and qualified to AEC Q101. It protects MOSFETs and sensor signal lines in automotive powertrain control modules against inductive switching transients.
For engineers reviewing the 1.5KA33AHE3/51 datasheet, 1.5KA33AHE3/51 pinout, 1.5KA33AHE3/51 application, or 1.5KA33AHE3/51 equivalent, key selection criteria include clamping voltage vs. surge current, junction temperature rating up to +185 °C, RoHS-compliant HE3 packaging, and AEC Q101 qualification for under-hood environments.
Technical Context
This TVS diode uses Vishay's patented PAR® construction for stable high-temperature operation and low incremental surge resistance. Its unidirectional polarity enables precise reverse-biased clamping during positive transients on power or signal rails.
It delivers 1500 W peak pulse power with a 10/1000 µs waveform and maintains clamping performance across -65 °C to +185 °C operating junction temperature, supported by derating curves for pulse power vs. initial TJ and lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains single high-energy transients without failure in automotive load-dump or inductive kick scenarios |
| Breakdown Voltage VBR (min/max) | 31.4 V / 34.7 V - defines reliable conduction onset threshold under standardized 10 mA test current |
| Clamping Voltage VC at IPPM | 45.7 V at 32.8 A - maximum voltage seen by protected circuit during full-rated surge event |
| Stand-off Voltage VWM | 28.2 V - maximum continuous reverse voltage before leakage exceeds 1 µA at 25 °C |
| Junction Temperature Range | -65 °C to +185 °C - supports placement near hot engine components in AEC Q101-qualified systems |
| Surge Current IFSM | 200 A (8.3 ms half-sine) - withstands repetitive motor-commutation surges without degradation |
| RoHS & Whisker Rating | RoHS compliant; JESD201 Class 2 whisker-tested matte tin leads - ensures long-term solder joint reliability |
Pinout & Package
Package: Case Style 1.5KA - molded epoxy body with UL 94 V-0 flammability rating, 0.375" (9.5 mm) lead length, axial-leaded through-hole configuration. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; carries full surge current during clamping |
| Cathode | Protected line connection / clamping node | Connected to line being protected (e.g., 12 V rail or sensor output); voltage clamped relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables stable VBR and low dynamic impedance over lifetime and temperature extremes |
| AEC Q101 qualification | Validated for automotive under-hood use including thermal cycling, humidity, and mechanical shock |
| 1500 W peak pulse power | Meets ISO 7637-2 Pulse 5a (load dump) and Pulse 1/2b (inductive switch-off) requirements |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage stress on downstream ICs while maintaining margin above VWM |
| Matte tin plated leads (J-STD-002) | Ensures consistent wetting and void-free solder joints in automated through-hole assembly |
Applications
| Automotive Powertrain Control | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Protecting gate drivers and microcontroller I/O in engine control units exposed to alternator load dump and solenoid coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply rail and chassis ground to clamp transients before they reach sensitive logic. Use Value: Clamps to 45.7 V at 32.8 A, staying well below 50 V absolute maximum ratings of common automotive MCUs and gate drivers. | Use Scenario: Safeguarding analog sensor inputs (e.g., current shunt amplifiers) in variable-frequency drives subject to EMI and commutation noise. IC Role / Device Role / Timing Role: Mounted directly at connector entry point to absorb fast-rising transients (<1 ns rise time) before propagation into signal conditioning circuitry. Use Value: Fast response time and low incremental surge resistance limit voltage overshoot to <46 V, preserving ADC input integrity. |
| Automotive Body Electronics | Telecom Power Interface |
Use Scenario: Shielding LIN bus transceivers and door module microcontrollers from battery disconnect spikes and relay bounce. IC Role / Device Role / Timing Role: Reverse-biased across VCC–GND pins of transceiver ICs to provide low-impedance shunt path during negative-going transients. Use Value: Withstands 200 A surge (8.3 ms) and operates reliably at +185 °C junction temperature near fuse boxes or lighting controllers. | Use Scenario: Guarding PoE-powered device DC inputs against lightning-induced surges on outdoor telecom lines. IC Role / Device Role / Timing Role: Primary front-end protection stage upstream of DC-DC converters and hot-swap controllers. Use Value: 1500 W rating handles IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing when used with appropriate series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33AHE3/52 | Same VBR range (31.4–34.7 V), lower PPPM (600 W), SMB package (surface-mount) | Not AEC Q101 qualified; suited for non-automotive industrial PCBs with space constraints | Select when board area is limited and automotive qualification is not required |
| 1.5KE33A | Same VBR | Legacy part; no AEC Q101 qualification, higher leakage at 150 °C, no HE3 whisker rating | Acceptable for cost-sensitive consumer or computing applications where extended temperature reliability is secondary |
Compared with SMBJ33AHE3/52 and 1.5KE33A, the 1.5KA33AHE3/51 uniquely combines AEC Q101 qualification, 1500 W surge capability, and axial-leaded robustness for high-reliability automotive harness connections - making it the only choice for under-hood powerline protection where mechanical durability and thermal endurance are mandatory.
Availability
1.5KA33AHE3/51 is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drive protection, and telecom power interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1.5KA33AHE3/51 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 TVS devices, with global manufacturing and quality systems certified to ISO/TS 16949 and AEC standards.
The 1.5KA family was developed specifically for high-reliability automotive transient suppression, emphasizing thermal stability, surge robustness, and qualification to AEC Q101 for under-hood deployment.
FAQ
What is the clamping voltage of the 1.5KA33AHE3/51 at its rated peak pulse current?
The 1.5KA33AHE3/51 has a maximum clamping voltage (VC) of 45.7 V at its rated peak pulse current (IPPM) of 32.8 A, measured using a 10/1000 µs waveform per ANSI/IEEE C62.35. This value is guaranteed across the full operating temperature range and ensures protected circuits remain within safe voltage margins during surge events. The 1.5KA33AHE3/51 achieves this with low incremental surge resistance inherent to its PAR® construction.
Is the 1.5KA33AHE3/51 qualified for automotive use?
Yes, the 1.5KA33AHE3/51 is explicitly qualified to AEC Q101 for automotive applications, as confirmed in the Vishay document 88300 revision 20-Oct-08. It meets rigorous stress tests including temperature cycling, high-temperature operating life, and mechanical shock - making it suitable for under-hood environments where junction temperatures reach +185 °C. The 1.5KA33AHE3/51 also features RoHS compliance and JESD201 Class 2 whisker-tested leads.
What does the HE3 suffix indicate on the 1.5KA33AHE3/51?
The HE3 suffix on the 1.5KA33AHE3/51 denotes a RoHS-compliant, high-reliability variant with matte tin-plated leads that pass JESD201 Class 2 whisker testing and meet J-STD-002 solderability requirements. It also signifies AEC Q101 qualification and enhanced thermal stability for automotive-grade performance. The 1.5KA33AHE3/51 is not a standard commercial part - the HE3 designation confirms its suitability for mission-critical automotive and industrial deployments.
How does the 1.5KA33AHE3/51 differ from the non-A version (1.5KA33HE3/51)?
The 1.5KA33AHE3/51 has tighter breakdown voltage tolerance (31.4 V to 34.7 V) versus the 1.5KA33HE3/51 (29.7 V to 36.3 V), resulting in more predictable clamping behavior and reduced risk of premature conduction. Both share the same 1500 W rating and AEC Q101 qualification, but the "A" suffix indicates improved VBR distribution control - critical for designs requiring precise voltage margining around 33 V rails. The 1.5KA33AHE3/51 is preferred where consistent clamping onset is essential.
Can the 1.5KA33AHE3/51 be used in bidirectional configurations?
No, the 1.5KA33AHE3/51 is available in uni-directional polarity only, as stated in the Vishay datasheet. Its internal structure is optimized for reverse-biased clamping on positive transients; it does not provide symmetrical protection for AC or bipolar surge waveforms. For bidirectional protection, two 1.5KA33AHE3/51 devices must be connected in series opposing configuration, or a dedicated bidirectional TVS such as the 1.5SMC33CA should be selected instead. The 1.5KA33AHE3/51 data sheet explicitly prohibits use outside its specified unidirectional mode.
1.5KA33AHE3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KA
1.5KA33AHE3/51 FAQ
1.How can I place an order for 1.5KA33AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA33AHE3/51 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 1.5KA33AHE3/51 reliable?
The price and inventory of 1.5KA33AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA33AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA33AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA33AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA33AHE3/51?
1.5KA33AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA33AHE3/51 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 1.5KA33AHE3/51?
For technical support, including 1.5KA33AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA33AHE3/51 requirements.
6.How does Aetrix verify that 1.5KA33AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA33AHE3/51 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 1.5KA33AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA33AHE3/51?
All 1.5KA33AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA33AHE3/51, 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 1.5KA33AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA33AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA33AHE3/51 Tags
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