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Vishay General Semiconductor - Diodes Division 1.5KE33AHE3/51
- Part No.:
- 1.5KE33AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33AHE3/51.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:8,409
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Product details
Overview
1.5KE33AHE3/51 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in power rails and signal lines. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1 mA), 1500 W peak pulse power rating (10/1000 µs waveform), clamping voltage of 45.7 V at 32.8 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1.5KE33AHE3/51 datasheet, 1.5KE33AHE3/51 pinout, 1.5KE33AHE3/51 application, or 1.5KE33AHE3/51 equivalent, this device is selected for robust surge immunity in DC power inputs, automotive body control modules, industrial sensor interfaces, and telecom line protection where fast clamping (<1 ns), low leakage (<1 µA at 28.2 V), and high surge current tolerance are required.
Technical Context
The 1.5KE33AHE3/51 operates as a unidirectional silicon avalanche diode with glass-passivated junction, enabling precise voltage clamping during transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its 10/1000 µs waveform response delivers 32.8 A peak pulse current and maintains clamping within 45.7 V - critical for protecting downstream MOSFETs and ICs rated ≤36 V.
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15.4 °C/W, supporting operation up to TJ = 175 °C. The device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets JESD 201 Class 2 whisker resistance due to its HE3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1 mA - defines precise clamping onset threshold for 33 V nominal systems |
| VWM | 28.2 V - maximum continuous reverse working voltage; ensures no conduction under normal 24 V rail operation |
| VC @ IPPM | 45.7 V at 32.8 A - limits transient voltage seen by protected circuitry during 1500 W surge |
| IPPM | 32.8 A - peak pulse current handling capacity under standardized 10/1000 µs waveform |
| PPPM | 1500 W - peak pulse power rating enabling protection against severe transients per IEC 61000-4-5 |
| ID @ VWM | <1 µA - ultra-low reverse leakage preserves system efficiency and avoids false triggering |
| TJ max. | 175 °C - extended junction temperature range supports under-hood automotive and industrial environments |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded DO-201AD molded epoxy package with RoHS-compliant matte tin plating; UL 94 V-0 rated molding compound; 0.375" (9.5 mm) lead length standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / cathode-referenced clamping node | Connected to ground or low-impedance return path; enables unidirectional clamping from VIN to GND |
| Cathode | Protected line connection / high-side transient sink | Connected to input rail (e.g., 24 V supply); absorbs positive-going surges toward ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS power domains |
| 1500 W peak pulse power (10/1000 µs) | Withstands high-energy transients per ISO 7637-2 Pulse 5a without degradation |
| Clamping response time <1 ns | Engages before sensitive ICs experience overvoltage damage during ESD or fast-rising surges |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth in high-reliability automotive and industrial assemblies |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 24 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping device placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤45.7 V, preventing damage to 36 V-rated buck controllers and microcontrollers. |
Use Scenario: 4–20 mA current loop sensors in factory automation subject to cable-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS shunting induced transients on analog input lines before signal conditioning op-amps. Use Value: Maintains signal integrity with <1 µA leakage at 28.2 V, avoiding offset errors in precision current measurement. |
| Telecom DC Power Feeds | Consumer Device USB Power Input |
Use Scenario: Central office equipment powered via -48 V DC distribution with lightning coupling risk. IC Role / Device Role / Timing Role: Front-end protection on -48 V input stage, oriented anode-to-rail for negative surge suppression. Use Value: Clamps 1500 W surges within 45.7 V envelope, preserving rectifier bridge and upstream fuse coordination. |
Use Scenario: USB-C PD adapters with 20 V output rails susceptible to hot-plug transients and ESD. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary DC-DC regulation, safeguarding USB controller ICs. Use Value: Fast sub-nanosecond response prevents latch-up in 3.3 V/5 V logic while sustaining 32.8 A surge current. |
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 | DO-214AA package; lower PPPM = 600 W; VC = 53.3 V at 11.2 A | Compact surface-mount alternative for space-constrained PCBs; not suitable for 1500 W surge requirements | Select SMBJ33A only when board area is critical and surge energy is limited to IEC 61000-4-5 Level 3 (1 kV/2 kV) |
| 1.5KE33CA | Bi-directional variant; same VBR, VC, and PPPM; symmetric clamping for AC-coupled or floating lines | Required for bidirectional signal paths (e.g., RS-485, CAN bus) or ungrounded power systems | Choose 1.5KE33CA when protecting differential or AC signals where polarity reversal must be suppressed in both directions |
Compared with SMBJ33A and 1.5KE33CA, the 1.5KE33AHE3/51 offers superior surge energy handling in through-hole form factor and AEC-Q101 validation - making it optimal for high-reliability 24 V/33 V rail protection where mechanical robustness and automotive qualification are mandatory.
Availability
1.5KE33AHE3/51 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom power supplies, and consumer power adapters requiring stable component supply across multi-year production cycles.
Supply support for 1.5KE33AHE3/51 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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The 1.5KE series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes demand proven ruggedness and AEC-Q101 compliance.
FAQ
What is the breakdown voltage tolerance of the 1.5KE33AHE3/51?
The 1.5KE33AHE3/51 has a specified breakdown voltage range of 31.4 V to 34.7 V at 1 mA test current, representing ±5% tolerance around the nominal 33 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports reliable design margining for 24 V and 28 V systems. The 1.5KE33AHE3/51 maintains this specification under TA = 25 °C per Vishay Document 88301.
Is the 1.5KE33AHE3/51 suitable for automotive applications?
Yes, the 1.5KE33AHE3/51 is AEC-Q101 qualified per Vishay documentation and specifically approved for automotive use in categories including engine control, body electronics, and infotainment power domains. Its HE3 suffix confirms compliance with JESD 201 Class 2 whisker resistance and its 175 °C maximum junction temperature supports under-hood deployment. The 1.5KE33AHE3/51 meets ISO 7637-2 Pulse 5a requirements when applied with appropriate layout and grounding.
How does the clamping voltage of the 1.5KE33AHE3/51 compare to its breakdown voltage?
The 1.5KE33AHE3/51 clamps at 45.7 V when subjected to its full 32.8 A peak pulse current (10/1000 µs waveform), which is approximately 38% above its minimum breakdown voltage of 31.4 V. This incremental clamping voltage (ΔVC = 14.3 V) reflects the device's low dynamic impedance and ensures protected circuits remain within safe operating limits during surge events. Data is confirmed in Table 1 of Vishay Document 88301.
What is the maximum reverse leakage current for the 1.5KE33AHE3/51 at rated standoff voltage?
At its maximum working voltage (VWM) of 28.2 V and TA = 25 °C, the 1.5KE33AHE3/51 exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage preserves power efficiency in always-on systems and avoids false triggering in high-impedance sensing circuits. The value is specified in the Electrical Characteristics table of Vishay Document 88301 and applies to all 1.5KE33AHE3/51 units.
Does the 1.5KE33AHE3/51 have a defined thermal resistance specification?
Yes, the 1.5KE33AHE3/51 has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and a junction-to-lead value (RθJL) of 15.4 °C/W, measured under standard conditions with 0.375" (9.5 mm) lead length. These values enable accurate thermal modeling for PCB layout and heatsinking decisions, especially in high-temperature environments like automotive under-hood applications. The data appears in the Thermal Characteristics section of Vishay Document 88301.
1.5KE33AHE3/51 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE33AHE3/51 FAQ
1.How can I place an order for 1.5KE33AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33AHE3/51 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 1.5KE33AHE3/51 reliable?
The price and inventory of 1.5KE33AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE33AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33AHE3/51?
1.5KE33AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33AHE3/51 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 1.5KE33AHE3/51?
For technical support, including 1.5KE33AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33AHE3/51 requirements.
6.How does Aetrix verify that 1.5KE33AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE33AHE3/51 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 1.5KE33AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE33AHE3/51?
All 1.5KE33AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33AHE3/51, 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 1.5KE33AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE33AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33AHE3/51 Tags
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