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Vishay General Semiconductor - Diodes Division 1.5KE51AHE3_B/C
- Part No.:
- 1.5KE51AHE3_B/C
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51AHE3_B/C.pdf
- Description:
- 1.5KW,51V 5%,UNIDIR,AXIAL TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,760
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Product details
Overview
1.5KE51AHE3_B/C 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 48.5 V to 53.6 V breakdown voltage (VBR), 43.6 V maximum standoff voltage (VWM), 70.1 V clamping voltage at 21.4 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and operates across –55 °C to +175 °C junction temperature. It is used to protect MOSFETs, ICs, and sensor interfaces against lightning-induced transients and inductive switching surges.
For engineers reviewing the 1.5KE51AHE3_B/C datasheet, 1.5KE51AHE3_B/C pinout, 1.5KE51AHE3_B/C application, or 1.5KE51AHE3_B/C equivalent, this part delivers verified transient suppression performance with AEC-Q101 qualification, RoHS-compliant matte tin plating, JESD 201 Class 2 whisker resistance, and UL 94 V-0 molded epoxy packaging - critical for automotive, industrial, and telecom power rail hardening.
Technical Context
This unidirectional TVS diode employs a glass passivated silicon junction optimized for fast clamping response (<1 ns) and low incremental surge resistance. Its 1500 W peak pulse power rating is defined under standardized 10/1000 µs waveform conditions with 0.01 % duty cycle, and thermal performance is characterized by RθJA = 75 °C/W and RθJL = 15.4 °C/W.
The device exhibits a maximum reverse leakage of 1.0 µA at 43.6 V VWM, a maximum forward voltage of 3.5 V at 100 A (per JEDEC spec), and a temperature coefficient of VBR of +0.102 %/°C - enabling stable clamping behavior across wide ambient ranges in high-reliability systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 48.5 V min / 53.6 V max at 1.0 mA test current - defines precise voltage threshold where clamping initiates |
| Standoff Voltage VWM | 43.6 V - maximum continuous DC or RMS voltage the device blocks without leakage exceeding 1.0 µA |
| Clamping Voltage VC | 70.1 V at 21.4 A IPPM - limits transient voltage seen by protected circuitry during 10/1000 µs surge |
| Peak Pulse Power PPPM | 1500 W - sustains single 1 ms transients common in lightning and load dump events |
| Operating Temperature | –55 °C to +175 °C - supports under-hood automotive, industrial motor drives, and outdoor telecom equipment |
| Package | Case Style 1.5KE - axial-leaded DO-201AD package with 0.375" lead length, UL 94 V-0 rated epoxy body |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
1.5KE51AHE3_B/C uses the standard DO-201AD (Case Style 1.5KE) axial-leaded package. The cathode is marked by a color band on the body; polarity must be observed in series connection with protected circuits.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or lower-potential node in unidirectional TVS configuration | Enables low-VF conduction path during positive transients when cathode is at higher potential |
| Cathode | Current exit point in forward bias; connected to line being protected (e.g., 48 V rail) | Defines clamping reference - voltage between cathode and anode is clamped to ≤70.1 V during surge |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| 1500 W peak pulse power (10/1000 µs) | Protects against IEC 61000-4-5 Level 4 surges (4 kV line-to-line) without degradation |
| AEC-Q101 qualified (HE3_B suffix) | Validated for automotive powertrain and body electronics per stress test requirements |
| UL 94 V-0 epoxy molding | Prevents flame propagation in fault conditions - required for enclosed industrial and EV charging systems |
| JESD 201 Class 2 whisker resistance | Eliminates tin whisker growth risk in high-humidity, high-temperature environments over 15+ year service life |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery management system (BMS) monitoring lines from load dump transients up to 60 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sense line and ground to clamp positive-going spikes before they reach ADC inputs. Use Value: Limits transient voltage to ≤70.1 V at 21.4 A, preventing latch-up or gate oxide damage in precision analog front-ends. |
Use Scenario: Shielding RS-485 transceivers in factory automation PLCs from EFT and surge coupling on field wiring. IC Role / Device Role / Timing Role: Primary protection device on differential bus lines, operating in parallel with secondary GDT or polymer PTC. Use Value: Sub-nanosecond response ensures clamping occurs before transceiver input stages experience destructive overvoltage. |
| Telecom DC Power Input Stage | Consumer Appliance Motor Drive Control |
Use Scenario: Safeguarding PoE-powered network switches against induced lightning surges on 57 V DC input rails. IC Role / Device Role / Timing Role: First-stage crowbar device on main DC input, coordinated with upstream fuse and downstream DC-DC converter OVP. Use Value: 1500 W rating handles multi-kA surge currents while maintaining <1.0 µA leakage at 43.6 V standby operation. |
Use Scenario: Protecting microcontroller GPIOs driving relay coils in smart home HVAC controllers. IC Role / Device Role / Timing Role: Snubber-connected TVS across coil terminals to suppress flyback voltage during turn-off. Use Value: Clamps inductive kick to ≤70.1 V, eliminating need for external freewheeling diodes and reducing PCB footprint. |
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 | DO-214AA package (SMB), 51 V VBR, 8.3 A IPPM, 600 W PPPM - lower power, surface-mount | Preferred for space-constrained PCBs; not suitable for >1 kA surge environments | Select SMBJ51A only when board area is limited and peak surge energy is below 100 mJ. |
| 1.5KE51CA | Bidirectional variant (same VBR range), symmetric clamping for AC-coupled or floating lines | Required for protecting differential pairs, antenna ports, or AC signal paths where polarity reversal occurs | Choose 1.5KE51CA only when bidirectional clamping is mandated by signal architecture - not a drop-in replacement. |
Compared with SMBJ51A, 1.5KE51AHE3_B/C delivers 2.5× higher surge power handling and axial-leaded robustness for through-hole mounting; compared with 1.5KE51CA, it provides superior unidirectional leakage control and lower forward voltage but cannot suppress negative transients on the protected line.
Availability
1.5KE51AHE3_B/C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom DC input staging, and consumer appliance motor drive control requiring stable component supply across extended temperature and surge stress conditions.
Supply support for 1.5KE51AHE3_B/C 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, and passive components for automotive, industrial, and computing markets.
The 1.5KE family was engineered for high-energy transient suppression in harsh environments, targeting applications where failure modes include lightning strikes, load dump, and electrostatic discharge in mission-critical power and signal paths.
FAQ
What is the maximum clamping voltage of the 1.5KE51AHE3_B/C under a 10/1000 µs surge?
The 1.5KE51AHE3_B/C clamps to a maximum of 70.1 V when subjected to its rated peak pulse current of 21.4 A under the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5KE51AHE3_B/C suitable for automotive applications?
Yes, the 1.5KE51AHE3_B/C is AEC-Q101 qualified (as indicated by the HE3_B suffix), meaning it has passed stress tests including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing. It is approved for use in automotive body electronics, infotainment power supplies, and ADAS sensor interfaces where transient immunity and long-term reliability are mandatory.
How does the 1.5KE51AHE3_B/C differ from the 1.5KE51A-E3 version?
The 1.5KE51AHE3_B/C differs from 1.5KE51A-E3 in qualification level and packaging: HE3_B/C denotes AEC-Q101 qualification and tape-and-reel delivery in 13" paper tape (C package code), whereas E3 versions are commercial-grade only. Both share identical electrical specs and DO-201AD packaging, but only HE3_B/C is authorized for automotive production use per manufacturer documentation.
What is the standoff voltage rating for the 1.5KE51AHE3_B/C?
The 1.5KE51AHE3_B/C has a maximum working standoff voltage (VWM) of 43.6 V - the highest continuous DC or RMS voltage it can block while maintaining reverse leakage ≤1.0 µA. This allows safe integration into 42–48 V nominal systems such as automotive 48 V mild hybrid architectures or industrial 48 V DC distribution networks.
Does the 1.5KE51AHE3_B/C require heatsinking in typical applications?
No active heatsink is required for the 1.5KE51AHE3_B/C in standard surge protection roles, as its 6.5 W steady-state power dissipation (PD) and 75 °C/W junction-to-ambient thermal resistance are sufficient for intermittent transient events. However, PCB copper area ≥1 cm² connected to both leads is recommended to enhance thermal dissipation during repetitive surge testing or elevated ambient temperatures above 75 °C.
1.5KE51AHE3_B/C 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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 22A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE51AHE3_B/C FAQ
1.How can I place an order for 1.5KE51AHE3_B/C through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51AHE3_B/C 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 1.5KE51AHE3_B/C reliable?
The price and inventory of 1.5KE51AHE3_B/C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51AHE3_B/C is usually 5 days.
3.What payment methods are accepted for 1.5KE51AHE3_B/C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51AHE3_B/C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51AHE3_B/C?
1.5KE51AHE3_B/C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51AHE3_B/C 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 1.5KE51AHE3_B/C?
For technical support, including 1.5KE51AHE3_B/C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51AHE3_B/C requirements.
6.How does Aetrix verify that 1.5KE51AHE3_B/C is sourced from the original manufacturer or authorized distributors?
All 1.5KE51AHE3_B/C 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 1.5KE51AHE3_B/C meets industry standards.
7.What is the process for return or replacement of 1.5KE51AHE3_B/C?
All 1.5KE51AHE3_B/C units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51AHE3_B/C, 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 1.5KE51AHE3_B/C part is unused and in its original packaging.
Return procedure for 1.5KE51AHE3_B/C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51AHE3_B/C Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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