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Vishay General Semiconductor - Diodes Division 1.5KE51A-E3/51
- Part No.:
- 1.5KE51A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51A-E3/51.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:8,360
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Product details
Overview
1.5KE51A-E3/51 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 48.5 V to 53.6 V breakdown voltage (VBR), 43.6 V maximum working peak reverse voltage (VWM), 70.1 V clamping voltage (VC) 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 commonly used to protect MOSFET gate drivers and automotive sensor interfaces against ESD and lightning-induced transients.
For engineers reviewing the 1.5KE51A-E3/51 datasheet, 1.5KE51A-E3/51 pinout, 1.5KE51A-E3/51 application, or 1.5KE51A-E3/51 equivalent, this page delivers verified electrical parameters, JEDEC 1.5KE package details, clamping behavior under surge conditions, thermal resistance data (RθJA = 75 °C/W), and direct alternatives with documented parameter differences.
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 action activates when transient voltage exceeds VBR, diverting up to 21.4 A (10/1000 µs waveform) while limiting voltage to ≤70.1 V at the device terminals.
It supports repetitive surge events at 0.01 % duty cycle and is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine). The device complies with JESD22-B106 solder dip (275 °C, 10 s) and meets UL 94 V-0 flammability requirements in its molded epoxy case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V - Ensures reliable conduction onset above normal operating voltage but below IC damage thresholds. |
| VWM | 43.6 V - Maximum continuous reverse voltage before leakage exceeds 1 µA; sets safe DC operating margin. |
| VC @ IPPM | 70.1 V at 21.4 A - Clamped voltage during 1500 W transient; defines worst-case stress on downstream components. |
| PPPM | 1500 W - Peak pulse power handling capability with 10/1000 µs waveform; validates robustness against lightning surges. |
| IFSM | 200 A - Non-repetitive forward surge rating (8.3 ms); supports high-energy inductive switch-off events. |
| TJ max | +175 °C - Enables operation in under-hood automotive or industrial power supply environments. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient; informs heatsinking requirements for sustained surge duty. |
Pinout & Package
Package: JEDEC DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body with matte tin-plated leads. Dimensions: 5.3 mm diameter × 9.5 mm length; lead spacing 9.5 mm; RoHS-compliant per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of protected circuit (e.g., ground or return path). |
| Cathode | Reverse-biased terminal; marked with color band | Connected to higher-potential line (e.g., 48 V rail); conducts during overvoltage to shunt energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance (±5 %) and long-term reliability under thermal cycling. |
| 1500 W peak pulse power (10/1000 µs) | Provides immunity to IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) without derating. |
| Sub-nanosecond response time | Clamps transients before sensitive logic or analog circuits experience overstress (e.g., <1 ns vs. 10–100 ns MOVs). |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes let-through voltage; critical for protecting 5 V or 3.3 V logic interfacing with 48 V systems. |
| UL 94 V-0 compliant epoxy case | Prevents flame propagation in enclosed power modules or automotive ECUs during fault conditions. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed control units from load dump and alternator transients in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp spikes up to ±120 V. Use Value: Limits voltage seen by buck controller IC to ≤70.1 V, preventing latch-up or gate oxide rupture during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding RS-485 transceivers in factory automation PLC I/O modules from EFT and surge coupling. IC Role / Device Role / Timing Role: TVS connected line-to-ground on differential bus pairs to suppress common-mode transients before receiver inputs. Use Value: Maintains signal integrity by clamping fast-rising noise (tr < 1 ns) without adding capacitance that degrades 10 Mbps data rates. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) from induced surges on 48 V PSE lines. IC Role / Device Role / Timing Role: Primary TVS on midspan injector output, coordinated with secondary TVS at PD input. Use Value: Absorbs 1500 W surge energy while holding clamped voltage below 70.1 V-within IEEE 802.3af/bt withstand limits. |
Use Scenario: Preventing overvoltage damage to USB-C PD sink controllers during adapter fault conditions. IC Role / Device Role / Timing Role: TVS installed at adapter output connector to limit transient excursions during short-circuit recovery. Use Value: Guarantees output stays below 70.1 V during 10/1000 µs surges, preserving compliance with USB PD 3.1 VCONN/VBUS fault thresholds. |
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; 51 V VBR; 69.4 V VC @ 17.9 A; 600 W PPPM. | Lower power rating suits space-constrained PCBs where 1500 W is not required; surface-mount only. | Select SMBJ51A for compact layouts needing SMT assembly and moderate surge immunity (IEC 61000-4-5 Level 3). |
| 1.5KE51CA | Bidirectional variant; same VBR range (48.5–53.6 V); identical PPPM and package; symmetrical clamping. | Required for AC-coupled or floating signal lines (e.g., Ethernet PHY, audio inputs) where polarity reversal occurs. | Choose 1.5KE51CA only when protecting bidirectional signals; unidirectional 1.5KE51A-E3/51 is optimal for DC rails with defined polarity. |
Compared with SMBJ51A, 1.55KE51A-E3/51 delivers 2.5× higher surge power in a through-hole package ideal for high-reliability power stages; versus 1.5KE51CA, it offers superior clamping efficiency on grounded DC lines due to absence of reverse-direction leakage path.
Availability
1.5KE51A-E3/51 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom DC input protection requiring stable component supply, traceable lot history, and long-term lifecycle support.
Supply support for 1.5KE51A-E3/51 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, rectifiers, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom infrastructure where failure modes demand proven ruggedness and AEC-Q101 compatibility.
FAQ
What is the breakdown voltage tolerance for 1.5KE51A-E3/51?
The 1.5KE51A-E3/51 has a specified breakdown voltage range of 48.5 V to 53.6 V at 1.0 mA test current, representing a ±5.2 % tolerance around the nominal 51 V rating. This tight VBR window ensures consistent clamping onset across production lots and enables precise coordination with downstream overvoltage protection circuits in designs using the 1.5KE51A-E3/51.
Does 1.5KE51A-E3/51 meet automotive qualification standards?
The base 1.5KE51A-E3/51 is commercial-grade and not AEC-Q101 qualified; however, the HE3 variant (e.g., 1.5KE51AHE3_B) carries full AEC-Q101 qualification. Engineers specifying 1.5KE51A-E3/51 for automotive use must verify whether their application requires formal qualification-otherwise, the standard 1.5KE51A-E3/51 remains suitable for non-safety-critical subsystems like infotainment power rails where qualification is not mandated.
How does the clamping voltage of 1.5KE51A-E3/51 compare to its breakdown voltage?
The 1.5KE51A-E3/51 clamps at 70.1 V when subjected to its rated 21.4 A peak pulse current (10/1000 µs), yielding a clamping ratio (VC/VBR) of approximately 1.4. This low ratio reflects efficient energy diversion and ensures protected ICs experience minimal overvoltage stress-critical for safeguarding 48 V system controllers whose absolute maximum ratings often sit near 75 V.
Can 1.5KE51A-E3/51 be used in parallel for higher surge capacity?
Yes, multiple 1.5KE51A-E3/51 devices can be paralleled to increase total peak pulse power handling, but strict matching of VBR (≤1 % spread) and symmetrical PCB layout (equal trace inductance/resistance) are mandatory to ensure current sharing. Without matching, one 1.5KE51A-E3/51 may absorb >80 % of surge energy and fail prematurely-so parallel use requires validation per application note AN940.
What is the maximum allowable soldering temperature for 1.5KE51A-E3/51?
The 1.5KE51A-E3/51 supports solder dip at 275 °C maximum for 10 seconds per JESD22-B106, and its matte tin-plated leads comply with J-STD-002 for solderability. Reflow profiles must stay within JEDEC J-STD-020 limits for DO-201AD packages; peak temperature should not exceed 260 °C for ≤10 s to avoid epoxy degradation or bond wire fatigue in the 1.5KE51A-E3/51.
1.5KE51A-E3/51 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE51A-E3/51 FAQ
1.How can I place an order for 1.5KE51A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51A-E3/51 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 1.5KE51A-E3/51 reliable?
The price and inventory of 1.5KE51A-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51A-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE51A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51A-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51A-E3/51?
1.5KE51A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51A-E3/51 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 1.5KE51A-E3/51?
For technical support, including 1.5KE51A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51A-E3/51 requirements.
6.How does Aetrix verify that 1.5KE51A-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51A-E3/51 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 1.5KE51A-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE51A-E3/51?
All 1.5KE51A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51A-E3/51, 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 1.5KE51A-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE51A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51A-E3/51 Tags
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