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Vishay General Semiconductor - Diodes Division 1.5KE30A/54
- Part No.:
- 1.5KE30A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE30A/54.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,848
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Product details
Overview
1.5KE30A 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 30 V nominal breakdown voltage (28.5–31.5 V at 1 mA), 25.6 V stand-off voltage, 41.4 V clamping voltage at 36.2 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE30A datasheet, 1.5KE30A pinout, 1.5KE30A application, or 1.5KE30A equivalent, this page delivers verified electrical parameters, JEDEC-standard package details, clamping performance under surge conditions, thermal derating behavior, and direct alternative options for circuit protection design-in.
Technical Context
The 1.5KE30A operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response time (<1 ns) and low incremental surge resistance to ensure rapid clamping during transient events. Its unidirectional polarity uses a cathode band marking and supports DC-biased protection paths without reverse conduction.
Rated for 175 °C maximum junction temperature and 6.5 W steady-state power dissipation on infinite heatsink, it complies with JESD22-B106 soldering (275 °C, 10 s) and meets UL 94 V-0 flammability requirements. The device is RoHS-compliant (E3 suffix) and available in AEC-Q101-qualified variants (HE3 suffix) for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 28.5–31.5 V at 1 mA - defines minimum voltage at which avalanche conduction begins; ensures reliable triggering above normal operating rail. |
| Stand-off Voltage VWM | 25.6 V - maximum continuous reverse working voltage; sets safe DC operating margin below breakdown. |
| Clamping Voltage VC | 41.4 V at 36.2 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| Peak Pulse Power PPPM | 1500 W - energy-handling capacity for standardized 1 ms transient; enables protection against IEC 61000-4-5 Level 4 surges. |
| Peak Pulse Current IPPM | 36.2 A - maximum non-repetitive surge current supported; informs PCB trace sizing and fuse coordination. |
| Junction Temperature Range | −55 °C to +175 °C - wide thermal operating envelope suitable for under-hood automotive and industrial environments. |
| Thermal Resistance RθJA | 75 °C/W - limits self-heating under sustained leakage or repeated pulses; guides heatsinking decisions for high-duty-cycle use. |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded DO-201AD molded epoxy package with matte tin-plated leads, UL 94 V-0 rated, 0.375" (9.5 mm) lead length standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge or bias conditions. |
| Cathode (marked with band) | Avalanche clamping terminal | Connected to higher-potential side; initiates controlled breakdown when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress. |
| 1500 W peak pulse power (10/1000 µs) | Supports robust protection against high-energy transients including lightning-induced surges per IEC 61000-4-5. |
| Sub-nanosecond response time | Clamps within <1 ns - faster than MOVs or polymer-based protectors - preserving signal integrity in high-speed circuits. |
| Low incremental clamping resistance | Ensures minimal voltage overshoot during high-current transients; critical for protecting 3.3 V/5 V logic and gate drivers. |
| AEC-Q101 qualified option (1.5KE30AHE3_B) | Validated for automotive powertrain and body electronics where extended temperature and lifetime reliability are mandatory. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery rail in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of LDOs and microcontrollers. Use Value: Limits transient excursions to ≤41.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V automotive MCUs. |
Use Scenario: 4–20 mA current loop input of PLC analog modules subjected to field wiring ESD and surge coupling. IC Role / Device Role / Timing Role: Front-end transient suppressor on signal conditioning path before op-amp buffer stage. Use Value: Clamps induced surges before they saturate input amplifiers or damage precision ADC front-ends. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: DC feed line of PoE-powered network switches encountering lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional TVS on DC input bus, coordinated with upstream gas discharge tube (GDT). Use Value: Provides fast secondary clamping after GDT fires, limiting let-through voltage to safe levels for DC-DC controllers. |
Use Scenario: Secondary-side 24 V output of AC/DC adapter driving motorized home appliances. IC Role / Device Role / Timing Role: Overvoltage guard on regulated output rail to prevent damage during feedback loop failure. Use Value: Absorbs up to 1500 W surge energy without degradation, maintaining system safety certification compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | Lower peak pulse power (600 W), smaller SMB package (surface-mount), 33.3–36.7 V VBR, 48.4 V VC at 12.4 A. | Better suited for space-constrained PCBs; not recommended for >1 kV/1.2/50 µs surge events requiring >1 kW handling. | Select SMBJ30A only when board area is critical and surge energy remains within 600 W limit. |
| 1.5SMC33A | Same 1500 W rating but SMC package (surface-mount), 31.4–34.7 V VBR, 53.3 V VC at 28.1 A, higher clamping voltage than 1.5KE30A. | Offers automated assembly compatibility but imposes higher voltage stress on protected ICs due to +12 V higher VC. | Choose 1.5SMC33A if reflow process and footprint compatibility outweigh clamping voltage penalty. |
Compared with 1.5KE30A, SMBJ30A trades surge capacity for compactness, while 1.5SMC33A maintains power rating but increases clamping voltage - making 1.5KE30A optimal for through-hole designs prioritizing lowest possible let-through voltage in high-energy transient environments.
Availability
1.5KE30A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line card surge hardening, and consumer power adapter safety-critical applications requiring stable component supply across multi-year production cycles.
Supply support for 1.5KE30A 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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and application-specific qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated via proven silicon avalanche physics and JEDEC-standard packaging.
FAQ
What is the breakdown voltage tolerance of the 1.5KE30A?
The 1.5KE30A has a specified breakdown voltage range of 28.5 V to 31.5 V at 1 mA test current, representing ±10 % tolerance around the nominal 30 V rating. This tolerance is guaranteed per JEDEC standard test conditions and directly impacts the minimum overvoltage threshold at which the device enters avalanche conduction. Designers must verify that this window aligns with system-level overvoltage margins and does not overlap with normal operating voltage peaks.
Does the 1.5KE30A require a heatsink for continuous operation?
The 1.5KE30A is rated for 6.5 W power dissipation only when mounted on an infinite heatsink at TL = 75 °C; its typical junction-to-ambient thermal resistance is 75 °C/W. Under normal DC bias, leakage current is negligible, so no heatsink is needed. However, during repetitive surge events or elevated ambient temperatures (>75 °C), thermal accumulation may occur - in such cases, PCB copper pour or localized heatsinking is advised to maintain TJ ≤ 175 °C. The 1.5KE30A itself is not intended for continuous power dissipation.
How does the 1.5KE30A compare to bidirectional TVS diodes like 1.5KE30CA?
The 1.5KE30A is unidirectional and features a cathode band marking, supporting DC-biased protection paths where reverse conduction must be blocked. In contrast, 1.5KE30CA is bidirectional with symmetrical clamping in both polarities and no polarity marking - suitable for AC lines or differential signal pairs. Their VBR, VC, and PPPM values are identical, but 1.5KE30CA cannot replace 1.5KE30A in circuits requiring reverse blocking, and vice versa. Pin-for-pin substitution is not valid without verifying circuit topology.
Is the 1.5KE30A compliant with automotive AEC-Q101 standards?
The base 1.5KE30A-E3 is commercial-grade; however, the variant 1.5KE30AHE3_B is explicitly AEC-Q101 qualified per Vishay documentation (Document 88301, Note 2). This qualification covers temperature cycling, humidity bias, mechanical shock, and surge endurance testing required for automotive powertrain and chassis applications. Always specify the HE3_B suffix when automotive qualification is mandatory - the standard 1.5KE30A part number alone does not carry this certification.
What is the maximum clamping voltage of the 1.5KE30A under a 10/1000 µs surge?
The maximum clamping voltage of the 1.5KE30A is 41.4 V when subjected to its rated peak pulse current of 36.2 A using the standardized 10/1000 µs double-exponential waveform. This value is measured across the device terminals during surge conduction and represents the highest voltage imposed on downstream components. It is confirmed in Vishay's Electrical Characteristics table (Document 88301, page 2) and forms the basis for selecting protected ICs with sufficient absolute maximum ratings.
1.5KE30A/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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 36.2A
- 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
1.5KE30A/54 FAQ
1.How can I place an order for 1.5KE30A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE30A/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 1.5KE30A/54 reliable?
The price and inventory of 1.5KE30A/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE30A/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE30A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE30A/54 transactions.
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4.How is shipping managed for 1.5KE30A/54?
1.5KE30A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE30A/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 1.5KE30A/54?
For technical support, including 1.5KE30A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE30A/54 requirements.
6.How does Aetrix verify that 1.5KE30A/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE30A/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 1.5KE30A/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE30A/54?
All 1.5KE30A/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE30A/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 1.5KE30A/54 part is unused and in its original packaging.
Return procedure for 1.5KE30A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE30A/54 Tags
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