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Vishay General Semiconductor - Diodes Division 1.5KE27HE3/73
- Part No.:
- 1.5KE27HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE27HE3/73.pdf
- Description:
- TVS DIODE 21.8VWM 39.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:3,822
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Product details
Overview
1.5KE27HE3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 27 V breakdown voltage (VBR = 25.7–28.4 V at 1.0 mA), 23.1 V maximum working voltage (VWM), 37.5 V clamping voltage (VC) at 40.0 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the 1.5KE27HE3/73 datasheet, 1.5KE27HE3/73 pinout, 1.5KE27HE3/73 application, or 1.5KE27HE3/73 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJL = 15.4 °C/W), JEDEC case style 1.5KE package dimensions, and real-world clamping behavior under transient surge conditions.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches rapidly (<1 ns response) to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
Rated for 1500 W peak pulse power (10/1000 µs), it supports repetitive surges at 0.01% duty cycle and handles up to 200 A non-repetitive forward surge (8.3 ms half-sine). Junction temperature range spans −55 °C to +175 °C, with thermal resistance from junction to lead at 15.4 °C/W - enabling direct PCB trace heat sinking without external heatsinks in moderate-power applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V at 1.0 mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 23.1 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 37.5 V at 40.0 A - clamped voltage during worst-case 1500 W transient, limiting stress on protected ICs |
| PPPM | 1500 W - peak surge power handling with 10/1000 µs waveform, suitable for lightning and inductive-switching transients |
| IFSM | 200 A - non-repetitive forward surge rating (8.3 ms half-sine), critical for input-stage protection in power supplies |
| TJ range | −55 °C to +175 °C - wide operating temperature window supporting under-hood automotive and industrial environments |
| RθJL | 15.4 °C/W - low junction-to-lead thermal resistance enables efficient self-heating management via PCB copper |
Pinout & Package
Package: JEDEC case style 1.5KE - molded epoxy body with matte tin-plated leads, RoHS-compliant, AEC-Q101 qualified (HE3 suffix), UL 94 V-0 rated. Cathode indicated by color band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during positive transients when used in reverse-biased configuration |
| Cathode | Avalanche clamping terminal | Marked with color band; connected to higher-potential rail (e.g., VIN); initiates clamping when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable, repeatable breakdown voltage and low leakage across temperature and lifetime |
| 1500 W peak pulse power (10/1000 µs) | Protects against severe transients including ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surge events |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock per JESD22 standards |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for sensitive 3.3 V/5 V logic |
| Solderability per J-STD-002/JESD 22-B102 | Guarantees robust lead termination integrity after reflow and wave soldering processes |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt clamping device placed between VBAT and GND, responding within <1 ns to clamp spikes above 27 V. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤37.5 V, preventing latch-up or gate oxide damage. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in PLC modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at connector entry point, clamping induced common-mode transients on signal+ and signal− lines. Use Value: Maintains signal integrity by suppressing >1 kV transients while adding <0.5 pF capacitance - negligible impact on 10 kHz sensor bandwidth. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Secondary-side overvoltage suppression on 48 V DC distribution lines in base station remote radio units. IC Role / Device Role / Timing Role: Standoff-rated protector on DC feed line, absorbing energy from nearby lightning-induced coupling. Use Value: Withstands 1500 W surges without degradation, eliminating need for redundant protectors and reducing BOM count. |
Use Scenario: Inrush and surge protection on AC-DC adapter primary rectifier output (post-bridge, pre-PFC stage). IC Role / Device Role / Timing Role: Fast-acting clamping element across bulk capacitor, triggered by switching transients or MOV failure modes. Use Value: Clamps to 37.5 V before capacitor overvoltage triggers OVP shutdown, extending adapter MTBF by preventing repeated fault cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower PPPM (600 W), smaller SMB package (vs. axial 1.5KE), VBR = 26.7–29.5 V | Preferred for space-constrained PCBs; less robust for high-energy automotive transients | Select when board area is critical and surge energy is limited to IEC 61000-4-5 Level 3 (1 kV/2 kV) |
| 1.5KE27A-E3/54 | Same electrical specs and package, but commercial-grade (non-AEC-Q101), E3 suffix only (no HE3) | Approved for industrial/commercial use only; not validated for automotive temperature cycling or vibration | Choose for cost-sensitive non-automotive designs where AEC-Q101 is not mandated |
Compared with 1.5KE27HE3/73, SMBJ24A trades surge robustness for compactness, while 1.5KE27A-E3/54 retains identical protection performance but lacks automotive qualification - making 1.5KE27HE3/73 the sole choice when both high-energy clamping and AEC-Q101 compliance are required.
Availability
1.5KE27HE3/73 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, telecom DC distribution, and consumer power adapter development requiring stable component supply and long-term lifecycle support.
Supply support for 1.5KE27HE3/73 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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of the 1.5KE27HE3/73 under full 1500 W surge conditions?
The 1.5KE27HE3/73 clamps to 37.5 V at 40.0 A peak pulse current (IPPM), corresponding to the standardized 10/1000 µs waveform delivering 1500 W. This value is measured per JEDEC test conditions and represents the maximum voltage imposed on protected circuitry during worst-case transient events - critical for verifying safe operating margins of downstream ICs rated for 36 V absolute maximum.
Is the 1.5KE27HE3/73 qualified for automotive applications?
Yes, the 1.5KE27HE3/73 carries the HE3 suffix, indicating full AEC-Q101 qualification per Vishay documentation (Document 88301, revision 09-Aug-2022). It has passed temperature cycling, high-temperature operating life, and mechanical shock testing required for under-hood and chassis-mounted automotive electronics - unlike the commercial-grade 1.5KE27A-E3/54 variant.
How does the 1.5KE27HE3/73 differ from bidirectional TVS diodes like 1.5KE27CA?
The 1.5KE27HE3/73 is unidirectional and functions as a polarity-sensitive clamp - conducting only in reverse bias above VBR. In contrast, 1.5KE27CA provides symmetrical clamping for AC-coupled or floating lines. The 1.5KE27HE3/73 offers lower leakage (<1.0 µA at 23.1 V) and tighter VBR tolerance than its bidirectional counterpart, making it preferred for DC power rail protection where polarity is fixed.
What is the thermal resistance from junction to lead (RθJL) for the 1.5KE27HE3/73?
The 1.5KE27HE3/73 has a typical junction-to-lead thermal resistance (RθJL) of 15.4 °C/W, as specified in Vishay's Document 88301. This low value enables effective heat dissipation through the leads into PCB copper pours - allowing sustained operation after multiple transients without thermal runaway, provided adequate copper area (≥1 in² per lead) is used per JEDEC guidelines.
Can the 1.5KE27HE3/73 be used in parallel to increase surge current handling?
While the 1.5KE27HE3/73 datasheet notes TVS diodes "can be used in series or parallel to increase peak power ratings", parallel operation requires matched VBR (±2%) and current-sharing resistors to avoid thermal imbalance. For 1.5KE27HE3/73, mismatched units may cause one device to absorb >80% of surge current - risking premature failure. Derating by 30% and using ballast resistors is mandatory for reliable parallel use.
1.5KE27HE3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 21.8V
- Voltage - Breakdown (Min):
- 24.3V
- Voltage - Clamping (Max) @ Ipp:
- 39.1V
- Current - Peak Pulse (10/1000µs):
- 38.4A
- 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
1.5KE27HE3/73 FAQ
1.How can I place an order for 1.5KE27HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE27HE3/73 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 1.5KE27HE3/73 reliable?
The price and inventory of 1.5KE27HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE27HE3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE27HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE27HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE27HE3/73?
1.5KE27HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE27HE3/73 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 1.5KE27HE3/73?
For technical support, including 1.5KE27HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE27HE3/73 requirements.
6.How does Aetrix verify that 1.5KE27HE3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE27HE3/73 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 1.5KE27HE3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE27HE3/73?
All 1.5KE27HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE27HE3/73, 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 1.5KE27HE3/73 part is unused and in its original packaging.
Return procedure for 1.5KE27HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE27HE3/73 Tags
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