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Vishay General Semiconductor - Diodes Division 1.5KA33AHE3/73
- Part No.:
- 1.5KA33AHE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA33AHE3/73.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:6,656
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Product details
Overview
1.5KA33AHE3/73 from Vishay General Semiconductor is an automotive-grade unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in power and signal lines. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 45.7 V under 32.8 A peak pulse current, and operates up to +185 °C junction temperature. It is AEC-Q101 qualified and used to protect MOSFETs, sensor signal lines, and microcontrollers in automotive engine control units.
For engineers reviewing the 1.5KA33AHE3/73 datasheet, 1.5KA33AHE3/73 pinout, 1.5KA33AHE3/73 application, or 1.5KA33AHE3/73 equivalent, key selection criteria include its 31.4–34.7 V breakdown range, 28.2 V stand-off voltage, 1.0 µA leakage at TJ = 150 °C, RoHS-compliant HE3 packaging, and PAR®-constructed epoxy case rated UL 94 V-0.
Technical Context
This TVS diode employs Vishay's patented PAR® (Planar Avalanche Rectifier) construction for stable avalanche behavior and low incremental surge resistance. Its unidirectional polarity enables precise reverse-biased clamping with fast response time (<1 ns) and minimal voltage overshoot during transients induced by inductive load switching.
Rated for 1500 W peak pulse power per 10/1000 µs waveform and 200 A non-repetitive forward surge (8.3 ms half-sine), it supports high-reliability operation across -65 °C to +185 °C, with thermal derating defined up to TL = 75 °C on infinite heatsink (PD = 6.5 W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - withstands high-energy automotive load dump and ISO 7637-2 pulses without failure |
| Breakdown Voltage (VBR) | 31.4 V min / 34.7 V max at 1.0 mA - defines reliable avalanche initiation threshold for clamping |
| Clamping Voltage (VC) | 45.7 V at 32.8 A - limits protected circuit voltage during worst-case surge event |
| Stand-off Voltage (VWM) | 28.2 V - maximum continuous reverse working voltage before leakage exceeds 1.0 µA |
| Junction Temperature Range | -65 °C to +185 °C - enables deployment in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - certified for automotive electronics per stress test requirements including HTOL, TCT, and HAST |
| RoHS & WEEE Compliant | Yes - HE3 suffix denotes matte tin-plated leads, J-STD-002 solderable, JESD201 Class 2 whisker tested |
Pinout & Package
Package: Case Style 1.5KA - molded epoxy body over passivated junction, UL 94 V-0 rated, 0.375" (9.5 mm) lead length, axial-leaded DO-201AD outline. Cathode denoted by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to system ground or low-side return in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., 24 V rail or sensor output); conducts when VIN > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Ensures uniform avalanche distribution and stable VBR over lifetime and temperature |
| 1500 W peak pulse rating (10/1000 µs) | Meets ISO 7637-2 Pulse 5a/b energy requirements for 12 V/24 V automotive systems |
| Low incremental surge resistance | Minimizes VC – VBR differential, reducing clamping overshoot during fast transients |
| High-temperature reliability (TJ max = 185 °C) | Supports placement near heat sources (e.g., ECUs, power converters) without derating penalties |
| HE3 suffix compliance | Meets JESD201 Class 2 whisker resistance and J-STD-002 solderability for high-volume SMT/reflow assembly |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protects 24 V supply rail and CAN transceiver power pins from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed in parallel with input filter capacitor to clamp surges before they reach LDOs and microcontrollers. Use Value: Clamps to 45.7 V at 32.8 A, limiting stress on downstream 40 V-rated regulators and ensuring ASIL-B functional safety compliance. |
Use Scenario: Shields analog input channels (4–20 mA loops) from field-induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted at terminal block entry point to absorb coupling noise from adjacent motor drives. Use Value: 28.2 V VWM allows compatibility with 24 V industrial rails while maintaining <1 µA leakage at 150 °C ambient. |
| Automotive Sensor Signal Line | Telecom Power Interface |
Use Scenario: Safeguards LIN bus or analog sensor outputs (e.g., pressure, temperature) against ESD and inductive kickback. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed directly at connector interface to minimize stub length and preserve signal integrity. Use Value: Fast response (<1 ns) and 45.7 V clamping prevent latch-up in 3.3 V/5 V sensor interface ICs during ISO 10605 ESD events. |
Use Scenario: Protects DC power input of remote radio units (RRUs) from lightning-induced surges on outdoor power feeds. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converter, coordinated with MOV and gas discharge tube. Use Value: 1500 W rating handles multi-kA induced currents; 185 °C TJ rating ensures reliability in sealed outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage 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 (smaller footprint, lower thermal mass) | Better suited for space-constrained PCBs with moderate surge exposure (e.g., infotainment USB ports) | Select when board area is limited and peak surge energy is ≤600 W; verify thermal design for repeated events. |
| 1.5KE33A-E3/54 | Same VBR/VC, identical 1500 W rating, but TO-201AA (axial) package, not AEC-Q101 qualified | Acceptable for industrial/commercial use where automotive qualification is not required | Choose for cost-sensitive non-automotive designs; avoid in AEC-Q101-mandated systems like ADAS or powertrain. |
Compared with 1.5KA33AHE3/73, SMBJ33AHE3/52 trades surge robustness for compactness, while 1.5KE33A-E3/54 matches electrical performance but lacks automotive qualification and uses a legacy package with higher thermal resistance.
Availability
1.5KA33AHE3/73 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O hardening, and telecom power interface surge suppression requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for 1.5KA33AHE3/73 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 demanding environments.
The 1.5KA family was engineered specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 qualification, high-temperature stability, and repeatable clamping performance under repetitive surge stress.
FAQ
What is the clamping voltage of the 1.5KA33AHE3/73 under maximum rated surge current?
The 1.5KA33AHE3/73 exhibits a maximum clamping voltage (VC) of 45.7 V when subjected to its rated peak pulse current of 32.8 A using the standard 10/1000 µs waveform. This value is measured at TA = 25 °C and ensures downstream components see no more than this voltage during surge events, making it suitable for protecting 40 V-rated power management ICs in automotive applications.
Is the 1.5KA33AHE3/73 suitable for bidirectional transient protection?
No, the 1.5KA33AHE3/73 is a unidirectional TVS diode, as confirmed by its datasheet features and polarity marking (cathode band). It is designed only for reverse-biased clamping applications. For bidirectional protection, a separate symmetric device such as the 1.5SMC33CAHE3/73 would be required - the 1.5KA33AHE3/73 does not provide forward conduction clamping capability.
What does the "HE3" suffix indicate for the 1.5KA33AHE3/73?
The HE3 suffix on the 1.5KA33AHE3/73 denotes Vishay's high-reliability, automotive-grade construction: matte tin-plated leads compliant with J-STD-002 solderability, passing JESD22-B102 for solderability and JESD201 Class 2 for tin whisker resistance. It also confirms RoHS compliance and AEC-Q101 qualification - critical for under-hood automotive deployments.
How does the 1.5KA33AHE3/73 compare to the 1.5KA33HE3/73 variant?
The 1.5KA33AHE3/73 has tighter breakdown voltage tolerance (31.4–34.7 V) versus the broader 1.5KA33HE3/73 range (29.7–36.3 V), resulting in lower clamping variation and improved predictability in precision protection circuits. Both share identical power ratings, thermal specs, and AEC-Q101 qualification, but the "A" suffix indicates enhanced VBR binning for higher consistency.
Can the 1.5KA33AHE3/73 be used in DC power supply inputs for 24 V systems?
Yes - the 1.5KA33AHE3/73 is routinely deployed on 24 V DC inputs in automotive and industrial systems. Its 28.2 V stand-off voltage (VWM) provides adequate margin above nominal 24 V, while its 45.7 V clamping voltage protects downstream 40 V-rated regulators and controllers during load dump events per ISO 7637-2 Pulse 5a (up to 110 V, 400 ms).
1.5KA33AHE3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- Packaging:
- Tape & Box (TB)
- 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
1.5KA33AHE3/73 FAQ
1.How can I place an order for 1.5KA33AHE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA33AHE3/73 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 1.5KA33AHE3/73 reliable?
The price and inventory of 1.5KA33AHE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA33AHE3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KA33AHE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA33AHE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA33AHE3/73?
1.5KA33AHE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA33AHE3/73 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 1.5KA33AHE3/73?
For technical support, including 1.5KA33AHE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA33AHE3/73 requirements.
6.How does Aetrix verify that 1.5KA33AHE3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KA33AHE3/73 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 1.5KA33AHE3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KA33AHE3/73?
All 1.5KA33AHE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA33AHE3/73, 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 1.5KA33AHE3/73 part is unused and in its original packaging.
Return procedure for 1.5KA33AHE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA33AHE3/73 Tags
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