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Vishay General Semiconductor - Diodes Division 1.5KA33HE3/73
- Part No.:
- 1.5KA33HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA33HE3/73.pdf
- Description:
- TVS DIODE 26.8VWM 47.7VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:7,116
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Product details
Overview
1.5KA33HE3/73 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge protection in harsh environments. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 47.7 V under 31.4 A peak pulse current, and operates up to +185 °C junction temperature - ideal for protecting automotive sensor signal lines and MOSFET gates against load-switching transients.
For engineers reviewing the 1.5KA33HE3/73 datasheet, 1.5KA33HE3/73 pinout, 1.5KA33HE3/73 application, or 1.5KA33HE3/73 equivalent, key selection criteria include its AEC-Q101 qualification, 29.7–36.3 V breakdown range, 26.8 V stand-off voltage, low 0.098 %/°C VBR tempco, and HE3 suffix confirming JESD201 Class 2 whisker resistance and RoHS-compliant high-reliability construction.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable clamping under repetitive surge stress and maintains performance across -65 °C to +185 °C operating range. Its unidirectional polarity and 3.5 V max forward voltage at 100 A support robust DC-biased protection schemes in automotive power domains.
The device meets AEC-Q101 stress test requirements for automotive electronics and features matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards. Its molded epoxy case achieves UL 94 V-0 flammability rating and supports 260 °C solder dip for 40 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains high-energy transients without failure in automotive load-dump or inductive switching events |
| Breakdown Voltage (VBR) | 29.7–36.3 V at 1.0 mA - defines precise clamping onset threshold for system-level overvoltage protection |
| Stand-off Voltage (VWM) | 26.8 V - ensures reliable non-conduction during normal 24 V automotive rail operation |
| Clamping Voltage (VC) | 47.7 V at 31.4 A - limits downstream voltage stress on protected ICs and MOSFETs during surge |
| Junction Temperature Range | -65 °C to +185 °C - enables deployment in engine bay, transmission control, and other high-temp automotive zones |
| Surge Current (IFSM) | 200 A (8.3 ms half-sine) - withstands high-current inrush events like jump-start or alternator load dump |
| Tempco of VBR | 0.098 %/°C - ensures predictable voltage shift over temperature, critical for precision protection margins |
Pinout & Package
Package: Case Style 1.5KA - axial-leaded, molded epoxy body with cathode band marking; dimensions: 1.0" (25.4 mm) min length × 0.210" (5.3 mm) max diameter; UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to system ground or low-side reference | Provides low-impedance return path during clamping; must be routed with minimal inductance for effective transient suppression |
| Cathode | Protected line connection; marked by color band | Connected to signal/power line requiring protection; reverse-biased operation enables fast clamping when VLINE exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables consistent clamping performance and long-term reliability under repeated surge stress without parameter drift |
| AEC-Q101 qualification | Validates suitability for automotive safety-critical systems including ADAS sensors and powertrain ECUs |
| HE3 suffix compliance | Confirms JESD201 Class 2 whisker resistance and RoHS-compliant high-reliability manufacturing |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response time), improving protection margin |
| 10/1000 µs waveform rating | Matches industry-standard IEC 61000-4-5 surge test profile for automotive and industrial equipment |
Applications
| Automotive Sensor Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors exposed to inductive kickback from solenoids and relays in vehicle chassis modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and microcontroller ADC input to clamp transients before signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V ADC inputs while maintaining signal integrity via 26.8 V stand-off and 47.7 V clamping. | Use Scenario: Safeguarding 12 V/24 V supply rails feeding microcontrollers and CAN transceivers in engine management systems subject to ISO 7637-2 pulse 1, 2a, and 5a. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main ECU power input, positioned upstream of DC-DC converters and LDOs. Use Value: Absorbs 1500 W surges without degradation, enabling compliance with automotive EMC immunity standards and extending ECU field life. |
| Body Control Module (BCM) Signal Lines | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Shielding LIN bus and switch-input lines in door modules and lighting controllers from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector interface to shunt fast transients before reaching MCU GPIOs. Use Value: Delivers sub-1 ns response and 1.0 µA leakage at 26.8 V, preserving signal rise time and minimizing false triggers in low-voltage digital interfaces. | Use Scenario: Protecting gate drivers and high-side/low-side MOSFETs in EPS motor inverters from voltage spikes generated during PWM commutation and regenerative braking. IC Role / Device Role / Timing Role: Bidirectional clamping not applicable; this unidirectional device used on DC-link side with proper polarity orientation to suppress positive-going spikes only. Use Value: Withstands 200 A surge current and 185 °C junction temperature, ensuring survivability in thermally constrained EPS enclosures near motor windings. |
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-E3/52 | Lower 600 W PPPM rating; SMC package; bidirectional variant available; 33 V nominal VBR (30–36.3 V) | Targeted at space-constrained consumer/industrial PCBs; lacks AEC-Q101 and HE3 whisker certification | Select when automotive qualification is not required and board area is limited; verify thermal derating for 24 V rail use. |
| 1.5KE33A | Same 1500 W rating but TO-204AA (DO-41) package; no AEC-Q101 qualification; higher 0.105 %/°C VBR tempco | Used in legacy industrial power supplies; not approved for automotive under-hood deployment | Acceptable for cost-sensitive non-automotive designs where temperature stability and long-term reliability are secondary. |
Compared with SMBJ33A-E3/52 and 1.5KE33A, the 1.5KA33HE3/73 provides superior high-temperature stability (0.098 %/°C vs. ≥0.105 %/°C), guaranteed AEC-Q101 qualification, and JESD201 Class 2 whisker resistance - making it the only choice for mission-critical automotive signal and power line protection where field failure is unacceptable.
Availability
1.5KA33HE3/73 is available at Aetrix Electronics and suitable for automotive sensor protection, engine control unit (ECU) power input hardening, and body control module (BCM) signal line safeguarding requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1.5KA33HE3/73 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, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The 1.5KA series is part of Vishay's automotive TVS portfolio engineered specifically for AEC-Q101 compliance, high-temperature operation, and robust transient immunity in next-generation vehicle electronics.
FAQ
What is the exact breakdown voltage range for the 1.5KA33HE3/73?
The 1.5KA33HE3/73 has a specified breakdown voltage (VBR) range of 29.7 V to 36.3 V at 1.0 mA test current, per Vishay Document Number 88300. This range ensures reliable triggering across manufacturing tolerances and temperature extremes while maintaining compatibility with 24 V automotive systems.
Is the 1.5KA33HE3/73 qualified for automotive use?
Yes, the 1.5KA33HE3/73 is AEC-Q101 qualified and designated as an automotive-grade component. Its HE3 suffix confirms compliance with JESD201 Class 2 whisker testing and RoHS directives, making it suitable for under-hood and safety-critical applications such as ADAS sensors and powertrain control units.
What does the "HE3" suffix mean in 1.5KA33HE3/73?
The HE3 suffix in 1.5KA33HE3/73 indicates high-reliability, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance requirements. It also denotes AEC-Q101 qualification and matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards.
What is the maximum clamping voltage of the 1.5KA33HE3/73 under surge conditions?
The 1.5KA33HE3/73 exhibits a maximum clamping voltage (VC) of 47.7 V at 31.4 A peak pulse current (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during standardized surge events.
Can the 1.5KA33HE3/73 be used in bidirectional protection configurations?
No, the 1.5KA33HE3/73 is unidirectional only, as explicitly stated in the Vishay datasheet. For bidirectional protection, a pair of unidirectional devices or a dedicated bidirectional TVS such as SMBJ33CA would be required - the 1.5KA33HE3/73 must be oriented with cathode toward the protected line.
1.5KA33HE3/73 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):
- 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
1.5KA33HE3/73 FAQ
1.How can I place an order for 1.5KA33HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA33HE3/73 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 1.5KA33HE3/73 reliable?
The price and inventory of 1.5KA33HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA33HE3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KA33HE3/73?
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4.How is shipping managed for 1.5KA33HE3/73?
1.5KA33HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA33HE3/73 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 1.5KA33HE3/73?
For technical support, including 1.5KA33HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA33HE3/73 requirements.
6.How does Aetrix verify that 1.5KA33HE3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KA33HE3/73 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 1.5KA33HE3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KA33HE3/73?
All 1.5KA33HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA33HE3/73, 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 1.5KA33HE3/73 part is unused and in its original packaging.
Return procedure for 1.5KA33HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA33HE3/73 Tags
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