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Vishay General Semiconductor - Diodes Division 1.5KA33HE3/51
- Part No.:
- 1.5KA33HE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA33HE3/51.pdf
- Description:
- TVS DIODE 26.8VWM 47.7VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:8,718
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Product details
Overview
1.5KA33HE3/51 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode with 1500 W peak pulse power (10/1000 µs), 29.7–36.3 V breakdown voltage, and AEC-Q101 qualification for under-hood electronics protection. It clamps transients to ≤47.7 V at 31.4 A and operates up to +185 °C junction temperature.
For engineers reviewing the 1.5KA33HE3/51 datasheet, 1.5KA33HE3/51 pinout, 1.5KA33HE3/51 application, or 1.5KA33HE3/51 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, surge current capability in automotive load-dump scenarios, thermal derating above 25 °C, and RoHS-compliant matte tin lead finish per J-STD-002.
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 robust reverse-biased clamping during positive transients on power rails or signal lines.
Designed for automotive environments, it meets AEC-Q101 stress requirements and supports 10/1000 µs waveform compliance per ANSI/IEEE C62.35. The 1.5KA33HE3/51 exhibits a +0.098 %/°C temperature coefficient of VBR, ensuring predictable breakdown drift across -65 °C to +185 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 29.7 V / 36.3 V - defines minimum clamping threshold and maximum standoff margin before conduction |
| VC @ IPPM | 47.7 V - maximum clamped voltage during 31.4 A 10/1000 µs surge, critical for downstream IC overvoltage margin |
| PPPM | 1500 W - peak transient energy handling capacity under standardized surge waveform |
| IFSM | 200 A - withstands 8.3 ms half-sine surge without failure, suitable for alternator load dump |
| TJ max. | +185 °C - enables placement near hot engine control units without derating loss |
| VWM | 26.8 V - maximum continuous reverse operating voltage; must exceed system nominal rail (e.g., 24 V automotive) |
| Leakage @ VWM | 1.0 µA - ultra-low standby current preserves battery life in always-on vehicle modules |
Pinout & Package
Package: Case Style 1.5KA - molded epoxy body with UL 94 V-0 rating, matte tin-plated leads, cathode indicated by color band. Dimensions: 1.0" × 1.0" × 0.375" (25.4 mm × 25.4 mm × 9.5 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; forms clamping loop with cathode |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V supply); color band identifies this end |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables stable VBR and low dynamic resistance under repeated high-temp cycling (185 °C TJ) |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock |
| 1500 W peak pulse power | Handles ISO 7637-2 Pulse 5a (load dump) without degradation when properly heatsinked |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response time) |
| RoHS-compliant HE3 suffix | Meets JESD201 Class 2 whisker resistance and solderability per J-STD-002/JESD22-B102 |
Applications
| Automotive Engine Control Unit (ECU) Power Protection | Industrial PLC Input/Output Protection |
|---|---|
Use Scenario: Protecting 24 V supply rail in diesel ECU against alternator load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 24 V rail and chassis ground to clamp transients below 48 V. Use Value: Prevents latch-up or destruction of MCU, CAN transceivers, and power MOSFET drivers during ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding digital I/O channels of programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff voltage (26.8 V) exceeds 24 V DC I/O rating while clamping to 47.7 V to protect FPGA I/O banks. Use Value: Eliminates need for external series impedance; enables direct connection to ruggedized industrial sensors and actuators. |
| Telecom Base Station DC Power Entry | Automotive ADAS Camera Module Supply Line |
Use Scenario: Secondary surge protection at -48 V DC power entry point of outdoor telecom cabinets. IC Role / Device Role / Timing Role: Reverse-biased TVS referenced to negative rail, absorbing common-mode transients induced by lightning coupling. Use Value: Complements upstream GDT/MOV stages by providing fast, low-clamp response for sub-microsecond spikes. | Use Scenario: Protecting 12 V supply to CMOS image sensor and serializer IC in rear-view camera housing. IC Role / Device Role / Timing Role: Mounted adjacent to connector; clamps ISO 10605 ESD (±25 kV air) and ISO 7637-2 Pulse 1/2b transients. Use Value: Maintains <1 µA leakage to avoid dark-current interference in analog video output path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-E3/52 | 600 W PPPM, 33 V VBR, DO-214AA package, bidirectional option available | Limited to lower-energy transients; unsuitable for full load-dump duty | Select only for cost-sensitive non-automotive 24 V systems with verified <600 W surge exposure |
| 1.5KE33A | Same VBR range but 1.5KE case (larger footprint), no AEC-Q101 qualification, 175 °C TJ max | Not qualified for automotive under-hood use; requires additional reliability validation | Acceptable for industrial controls where AEC-Q101 is not mandated and board space allows larger outline |
Compared with SMBJ33A-E3/52 and 1.5KE33A, the 1.5KA33HE3/51 delivers higher surge robustness (1500 W vs. 600 W or 1500 W without AEC-Q101), tighter thermal stability (+185 °C vs. +175 °C), and automotive-grade process control-making it the sole choice for production ECU designs requiring zero reliability waivers.
Availability
1.5KA33HE3/51 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, telecom base station power entry points, and ADAS camera module supply lines requiring stable component supply across extended temperature and high-reliability lifecycles.
Supply support for 1.5KA33HE3/51 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 is a global leader in discrete semiconductors, specializing in high-reliability diodes, rectifiers, and protection devices for harsh-environment applications.
The 1.5KA family was engineered specifically for automotive power-line transient suppression, emphasizing AEC-Q101 compliance, high-temperature stability, and repeatable clamping performance under real-world load-dump and ESD stress.
FAQ
What is the clamping voltage of the 1.5KA33HE3/51 at its rated peak pulse current?
The 1.5KA33HE3/51 has a maximum clamping voltage (VC) of 47.7 V when subjected to its rated peak pulse current (IPPM) of 31.4 A under the standard 10/1000 µs waveform. This value is measured at TA = 25 °C and ensures protected circuitry remains below critical overvoltage thresholds during surge events. The 1.5KA33HE3/51 maintains this clamping performance across its full operating temperature range due to low incremental surge resistance.
Is the 1.5KA33HE3/51 suitable for automotive under-hood applications?
Yes, the 1.5KA33HE3/51 is explicitly qualified to AEC-Q101 for automotive under-hood use. It operates reliably from -65 °C to +185 °C junction temperature, withstands 200 A 8.3 ms surge current, and features matte tin-plated leads compliant with J-STD-002 solderability standards. The 1.5KA33HE3/51 is designed for engine control units, transmission control modules, and ADAS power supplies where thermal and mechanical stress are extreme.
What does the HE3 suffix indicate on the 1.5KA33HE3/51 part number?
The HE3 suffix on the 1.5KA33HE3/51 denotes RoHS-compliant construction with high-reliability automotive-grade processing. It confirms compliance with JESD201 Class 2 whisker resistance testing and solderability per J-STD-002 and JESD22-B102. The 1.5KA33HE3/51 HE3 variant is also qualified to AEC-Q101, distinguishing it from commercial-grade equivalents in the same voltage family.
How does the 1.5KA33HE3/51 differ from the 1.5KA33A variant?
The 1.5KA33HE3/51 has a breakdown voltage range of 29.7 V to 36.3 V, while the 1.5KA33A variant specifies 31.4 V to 34.7 V - a tighter VBR tolerance. Both share identical PPPM (1500 W), VC (47.7 V / 45.7 V), and AEC-Q101 qualification. The 1.5KA33HE3/51 is optimized for general-purpose automotive protection, whereas the 1.5KA33A targets applications requiring tighter voltage matching, such as precision power rail clamping.
Can the 1.5KA33HE3/51 be used in bidirectional configurations?
No, the 1.5KA33HE3/51 is available in uni-directional polarity only, as confirmed in the Vishay datasheet Document Number 88300. Its cathode is marked by a color band, and it conducts only during reverse-biased overvoltage events. For bidirectional protection, engineers must select a dedicated bidirectional TVS or pair two uni-directional devices; the 1.5KA33HE3/51 itself does not support symmetrical clamping.
1.5KA33HE3/51 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):
- 26.8V
- Voltage - Breakdown (Min):
- 29.7V
- Voltage - Clamping (Max) @ Ipp:
- 47.7V
- Current - Peak Pulse (10/1000µs):
- 31.4A
- 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
1.5KA33HE3/51 FAQ
1.How can I place an order for 1.5KA33HE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA33HE3/51 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 1.5KA33HE3/51 reliable?
The price and inventory of 1.5KA33HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA33HE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA33HE3/51?
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4.How is shipping managed for 1.5KA33HE3/51?
1.5KA33HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA33HE3/51 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 1.5KA33HE3/51?
For technical support, including 1.5KA33HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA33HE3/51 requirements.
6.How does Aetrix verify that 1.5KA33HE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA33HE3/51 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 1.5KA33HE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA33HE3/51?
All 1.5KA33HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA33HE3/51, 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 1.5KA33HE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA33HE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA33HE3/51 Tags
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