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Vishay General Semiconductor - Diodes Division 1.5KE51HE3/73
- Part No.:
- 1.5KE51HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51HE3/73.pdf
- Description:
- TVS DIODE 41.3VWM 73.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,403
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Product details
Overview
1.5KE51HE3/73 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 51 V breakdown voltage (VBR = 48.5–53.6 V at 1 mA), 1500 W peak pulse power (10/1000 µs), clamping voltage of 70.1 V at 21.4 A, and operates across –55 °C to +175 °C junction temperature. It is used in automotive power supply inputs and industrial sensor interfaces where fast transient suppression is critical.
For engineers reviewing the 1.5KE51HE3/73 datasheet, 1.5KE51HE3/73 pinout, 1.5KE51HE3/73 application, or 1.5KE51HE3/73 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJL = 15.4 °C/W), lead-free RoHS-compliant packaging, and real-world design context for surge protection layout and reliability validation.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-nanosecond response time (<1 ns) and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 µs waveform with 0.01% duty cycle, and it supports non-repetitive peak forward surge current up to 200 A (8.3 ms half-sine).
The device complies with JESD 201 Class 2 whisker testing (HE3 suffix), meets UL 94 V-0 flammability rating, and is rated for 6.5 W steady-state power dissipation on an infinite heatsink at TL = 75 °C. Its thermal resistance from junction to lead (RθJL) enables direct PCB copper pour thermal coupling without external heatsinking in most 1500 W surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at IT = 1 mA - defines precise voltage threshold for avalanche conduction onset |
| VWM | 43.6 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPPM | 70.1 V at 21.4 A - clamped voltage during full 1500 W transient, limiting downstream stress |
| PPPM | 1500 W - peak pulse power handling capability per 10/1000 µs standard waveform |
| IFSM | 200 A - single-cycle surge current rating (8.3 ms half-sine), critical for lightning/inductive switch protection |
| TJ max. | +175 °C - high-temperature operation support for under-hood automotive and industrial environments |
| RθJL | 15.4 °C/W - low junction-to-lead thermal resistance enables efficient heat transfer to PCB copper |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded, molded epoxy body (UL 94 V-0), matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse voltage reference | Connected to lower-potential side (e.g., GND or return path); determines polarity of clamping action |
| Cathode | Avalanche conduction node / clamping output | Marked with color band; connected to protected line (e.g., 48 V rail); conducts when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surges |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive-grade use including engine control units and ADAS power supplies |
| 1500 W peak pulse power (10/1000 µs) | Protects against ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 Level 4 transients |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth in high-reliability applications with >10-year field life requirements |
| Low RθJL = 15.4 °C/W | Allows direct thermal coupling to PCB copper, eliminating need for discrete heatsinks in most designs |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V/24 V vehicle battery feed to ECUs exposed to load dump (ISO 16750-2) and alternator transients. IC Role / Device Role / Timing Role: Primary shunt clamp placed upstream of DC-DC converters and LDOs to limit input voltage to safe levels. Use Value: Clamps 70.1 V at 21.4 A, preventing damage to downstream regulators rated for ≤60 V absolute max. |
Use Scenario: 4–20 mA analog sensor loop in factory automation subject to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (used in back-to-back configuration) protects op-amp inputs and ADC front-ends. Use Value: Sub-1 ns response ensures clamping occurs before sensitive analog circuitry experiences overvoltage stress. |
| Telecom DC Power Feeds | Consumer Device USB Port Surge Guard |
Use Scenario: –48 V telecom rectifier outputs feeding base station RF modules vulnerable to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rectifier output and DC distribution bus to absorb differential-mode transients. Use Value: 1500 W rating handles multi-kA surge currents typical in outdoor telecom cabinets per IEC 61000-4-5. |
Use Scenario: USB 2.0 data lines and VBUS in smart home hubs subjected to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF) used in series with data lines to suppress ESD without signal integrity degradation. Use Value: 43.6 V stand-off allows normal 5 V USB operation while clamping 8 kV HBM events to <70 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | Smaller SMB package (3.5 mm × 4.6 mm), lower PPPM = 600 W, same VBR range (48.5–53.6 V) | Preferred for space-constrained PCBs; not suitable for 1500 W surge events | Select SMBJ51A only when board area is critical and surge energy is limited to ≤600 W (e.g., secondary-side protection) |
| 1.5KE51A-E3/54 | Same 1.5KE package and electrical specs, but commercial-grade (non-AEC-Q101), JESD 201 Class 1A whisker rating | Approved for industrial/commercial use only; excluded from automotive production | Choose 1.5KE51A-E3/54 for cost-sensitive non-automotive applications where AEC-Q101 is not required |
Compared with 1.5KE51HE3/73, SMBJ51A offers footprint reduction at the expense of 60% lower surge power handling, while 1.5KE51A-E3/54 matches mechanical and electrical performance but lacks automotive qualification-making 1.5KE51HE3/73 the sole choice for AEC-Q101-compliant designs requiring full 1500 W capability.
Availability
1.5KE51HE3/73 is available at Aetrix Electronics and suitable for automotive power systems, industrial sensor interfaces, telecom DC feeds, and consumer USB port protection requiring stable component supply across extended temperature ranges and high-reliability certifications.
Supply support for 1.5KE51HE3/73 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 family was engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness against lightning, load dump, and ESD is mandatory.
FAQ
What is the breakdown voltage tolerance of the 1.5KE51HE3/73?
The 1.5KE51HE3/73 has a specified breakdown voltage range of 48.5 V to 53.6 V at test current IT = 1 mA, representing ±5.2% tolerance about the nominal 51 V rating. This tight VBR window ensures consistent clamping onset across production lots and supports reliable coordination with downstream overvoltage protection circuits in the 1.5KE51HE3/73 design.
Is the 1.5KE51HE3/73 suitable for bidirectional transient suppression?
No-the 1.5KE51HE3/73 is a unidirectional TVS diode, intended for DC line protection where polarity is fixed (e.g., positive supply rails). For bidirectional AC or data-line protection, Vishay offers the 1.5KE51CA variant. Using the 1.5KE51HE3/73 in reverse-biased configurations risks permanent failure due to lack of symmetrical avalanche structure.
Does the 1.5KE51HE3/73 meet AEC-Q101 requirements?
Yes-the HE3 suffix explicitly denotes AEC-Q101 qualification per Vishay's documentation (Rev. 09-Aug-2022, Doc. #88301). The 1.5KE51HE3/73 undergoes stress testing including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing to validate automotive-grade reliability for under-hood and chassis-mounted applications.
What is the maximum clamping voltage of the 1.5KE51HE3/73 during a 1500 W transient?
The 1.5KE51HE3/73 clamps to a maximum of 70.1 V at its rated peak pulse current of 21.4 A (10/1000 µs waveform). This value is measured under standardized conditions and represents the upper bound of voltage seen by downstream circuitry during worst-case surge events-critical for verifying margin against IC absolute maximum ratings in the 1.5KE51HE3/73 protection scheme.
How does the thermal performance of the 1.5KE51HE3/73 affect PCB layout?
With RθJL = 15.4 °C/W, the 1.5KE51HE3/73 efficiently transfers heat from junction to leads, enabling effective thermal management via wide copper pours connected directly to both leads. Layout best practice is to use ≥5 mm² of 2 oz copper per lead-this avoids thermal runaway during repetitive surges and maintains TJ < 175 °C even under sustained 6.5 W dissipation in the 1.5KE51HE3/73 implementation.
1.5KE51HE3/73 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):
- 41.3V
- Voltage - Breakdown (Min):
- 45.9V
- Voltage - Clamping (Max) @ Ipp:
- 73.5V
- Current - Peak Pulse (10/1000µs):
- 20.4A
- 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
1.5KE51HE3/73 FAQ
1.How can I place an order for 1.5KE51HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51HE3/73 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 1.5KE51HE3/73 reliable?
The price and inventory of 1.5KE51HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51HE3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE51HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51HE3/73?
1.5KE51HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51HE3/73 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 1.5KE51HE3/73?
For technical support, including 1.5KE51HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51HE3/73 requirements.
6.How does Aetrix verify that 1.5KE51HE3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51HE3/73 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 1.5KE51HE3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE51HE3/73?
All 1.5KE51HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51HE3/73, 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 1.5KE51HE3/73 part is unused and in its original packaging.
Return procedure for 1.5KE51HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51HE3/73 Tags
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