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Vishay General Semiconductor - Diodes Division 1.5KE51HE3/54
- Part No.:
- 1.5KE51HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51HE3/54.pdf
- Description:
- TVS DIODE 41.3VWM 73.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:5,113
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Product details
Overview
1.5KE51HE3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary-level 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 to protect MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE51HE3/54 datasheet, 1.5KE51HE3/54 pinout, 1.5KE51HE3/54 application, or 1.5KE51HE3/54 equivalent, this page delivers verified electrical parameters, JEDEC-standard 1.5KE package details, AEC-Q101 qualification status, thermal resistance (RθJL = 15.4 °C/W), and real-world clamping behavior under 10/1000 µs surge conditions.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast transient response (<1 ns) and low incremental surge resistance. Its unidirectional polarity enables cathode-referenced clamping on positive-going transients, with a maximum reverse standoff voltage (VWM) of 43.6 V and leakage current ≤1.0 µA at that voltage.
The device complies with JEDEC standard 1.5KE case style, supports 200 A non-repetitive forward surge (8.3 ms half-sine), and exhibits a temperature coefficient of VBR of +0.102 %/°C - enabling predictable voltage drift across automotive and industrial operating ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines precise clamping onset threshold for overvoltage detection |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 70.1 V at 21.4 A - actual clamped voltage during 1500 W 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - peak transient power handling capability per single 10/1000 µs pulse |
| IFSM | 200 A - surge current rating for 8.3 ms half-sine waveform, critical for inductive load snubbing |
| TJ max. | +175 °C - enables operation in under-hood automotive or high-ambient industrial environments |
| RθJL | 15.4 °C/W - low junction-to-lead thermal resistance supports reliable power dissipation without heatsink |
Pinout & Package
Package: JEDEC 1.5KE molded epoxy case (DO-201AD), axial-leaded, RoHS-compliant, matte tin-plated leads. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side reference; enables clamping of positive transients to GND |
| Cathode | Current exit point during forward conduction; marked with band | Connected to protected line (e.g., 48 V rail); absorbs surge energy when VLINE > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime, even under humidity or thermal cycling stress |
| 1500 W peak pulse power (10/1000 µs) | Supports robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 48 V systems |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive powertrain and body electronics applications requiring zero defect reliability |
| Response time < 1 ns | Clamps transients before sensitive ICs experience destructive overvoltage - faster than MOVs or GDTs |
| Low Rsurge and tight VC tolerance | Minimizes let-through energy (VC − VBR = 21.6 V) to preserve downstream component margin |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs and ADAS sensors from load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element on main power input, placed upstream of DC-DC converters and LDOs. Use Value: Clamps 120 V/100 ms load dump transients to ≤70.1 V, preventing damage to 60 V-rated power management ICs. |
Use Scenario: Shielding analog input channels (0–10 V, 4–20 mA) in programmable logic controllers from field wiring surges. IC Role / Device Role / Timing Role: First-line transient suppressor on terminal blocks, paired with series impedance and filtering. Use Value: Limits induced lightning surges (per IEC 61000-4-5) to safe levels before reaching precision op-amps and ADC front-ends. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Protection |
Use Scenario: Safeguarding -48 V telecom rectifier outputs and backplane power buses against cross-talk and EFT. IC Role / Device Role / Timing Role: Unidirectional TVS on supply rail, referenced to system ground with low-inductance layout. Use Value: Withstands repetitive 1500 W pulses at 0.01% duty cycle, maintaining clamping performance over decades of service. |
Use Scenario: Protecting high-side gate drivers (e.g., ISO5852S) from Miller-induced shoot-through spikes during SiC MOSFET switching. IC Role / Device Role / Timing Role: Localized clamp between gate and source, suppressing dv/dt-induced false turn-on. Use Value: Sub-ns response prevents gate oxide overstress; 70.1 V clamping ensures driver remains within absolute max ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | DO-214AA package (smaller footprint), 600 W PPPM, VC = 85 V @ 7.0 A | Lower power handling; suited for space-constrained consumer or IoT designs, not heavy industrial surges | Select SMBJ51A only if board area is critical and surge energy is ≤600 W; verify layout inductance does not degrade clamping. |
| 1.5KE51A-E3/54 | Same 1.5KE package and electrical specs, but commercial-grade (non-AEC-Q101 qualified) | Lacks automotive qualification; acceptable for industrial/commercial power supplies where AEC-Q101 is not mandated | Choose 1.5KE51A-E3/54 for cost-sensitive non-automotive applications; retain 1.5KE51HE3/54 where automotive reliability is required. |
Compared with SMBJ51A, 1.5KE51HE3/54 delivers 2.5× higher surge power and tighter clamping, making it suitable for harsh environments; versus 1.5KE51A-E3/54, it adds AEC-Q101 validation for automotive deployment without changing PCB layout or electrical behavior.
Availability
1.5KE51HE3/54 is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom DC power feeds, and motor drive gate driver protection requiring stable component supply and long-term lifecycle assurance.
Supply support for 1.5KE51HE3/54 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 ruggedness.
The 1.5KE family was engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping performance under extreme thermal and surge stress.
FAQ
What is the clamping voltage of the 1.5KE51HE3/54 under a 10/1000 µs surge?
The 1.5KE51HE3/54 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 per JEDEC test conditions and represents the upper limit of voltage seen by downstream circuitry during a full-power transient event. The 1.5KE51HE3/54 maintains this clamping performance across its qualified temperature range (–55 °C to +175 °C), with minimal derating up to 125 °C ambient.
Is the 1.5KE51HE3/54 AEC-Q101 qualified?
Yes, the HE3 suffix explicitly denotes AEC-Q101 qualification for the 1.5KE51HE3/54. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing (uHAST), confirming suitability for automotive powertrain and chassis applications. The 1.5KE51HE3/54 is validated per revision B of the AEC-Q101 standard and carries Vishay's automotive-grade material categorization.
What is the difference between 1.5KE51HE3/54 and 1.5KE51A-E3/54?
The 1.5KE51HE3/54 and 1.5KE51A-E3/54 share identical electrical specifications, package (1.5KE/DO-201AD), and RoHS compliance, but differ in qualification: the HE3 version is AEC-Q101 qualified, while the A-E3 version is commercial grade only. Both use the same glass-passivated junction and meet JESD201 class 2 whisker resistance. The 1.5KE51HE3/54 is intended for automotive applications where qualification is mandatory; the 1.5KE51A-E3/54 serves cost-sensitive industrial or consumer designs.
Can the 1.5KE51HE3/54 be used in bidirectional configurations?
No, the 1.5KE51HE3/54 is a unidirectional TVS diode, as confirmed by its part number suffix "A" and absence of "CA". Bidirectional variants (e.g., 1.5KE51CA) exist in the same family but feature symmetrical clamping in both polarities and no polarity marking. Using the 1.5KE51HE3/54 in a bidirectional application would result in forward conduction during negative transients, potentially causing failure. For bidirectional protection, select a CA-suffixed part or pair two unidirectional devices in series opposition.
What is the thermal resistance from junction to lead (RθJL) for the 1.5KE51HE3/54?
The 1.5KE51HE3/54 has a typical junction-to-lead thermal resistance (RθJL) of 15.4 °C/W, measured with 0.375" (9.5 mm) lead length per JEDEC standards. This low value enables efficient heat transfer from the silicon die to the PCB copper via the leads, supporting reliable operation at full 1500 W pulse power without external heatsinking. Derating begins above 25 °C ambient per the published power derating curve (Fig. 5 in datasheet 88301).
1.5KE51HE3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- 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
1.5KE51HE3/54 FAQ
1.How can I place an order for 1.5KE51HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51HE3/54 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 1.5KE51HE3/54 reliable?
The price and inventory of 1.5KE51HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51HE3/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE51HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51HE3/54?
1.5KE51HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51HE3/54 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 1.5KE51HE3/54?
For technical support, including 1.5KE51HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51HE3/54 requirements.
6.How does Aetrix verify that 1.5KE51HE3/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51HE3/54 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 1.5KE51HE3/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE51HE3/54?
All 1.5KE51HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51HE3/54, 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 1.5KE51HE3/54 part is unused and in its original packaging.
Return procedure for 1.5KE51HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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