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Vishay General Semiconductor - Diodes Division 1.5KE39A/54
- Part No.:
- 1.5KE39A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE39A/54.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,575
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Product details
Overview
1.5KE39A from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails and signal lines. It features a 39 V breakdown voltage (VBR = 37.1–41.0 V at 1.0 mA), 1500 W peak pulse power (10/1000 µs), clamping voltage of 53.9 V at 27.8 A, and operates across –55 °C to +175 °C junction temperature. It protects MOSFETs and ICs against inductive switching transients in industrial power supplies.
For engineers reviewing the 1.5KE39A datasheet, 1.5KE39A pinout, 1.5KE39A application, or 1.5KE39A equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under standardized surge waveforms, and direct-fit alternatives for ESD/lightning transient suppression in 24 V and 36 V systems.
Technical Context
The 1.5KE39A uses a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its unidirectional polarity enables cathode-referenced placement on positive supply rails, with a 33.3 V maximum working voltage (VWM) and 1.0 µA reverse leakage at rated VWM.
It complies with JEDEC standards for transient suppression and supports repetitive surge duty cycles up to 0.01 % (4 pulses/minute). Thermal resistance is 75 °C/W (junction-to-ambient) and 15.4 °C/W (junction-to-lead), enabling reliable operation without heatsinking below 6.5 W continuous dissipation at TL = 75 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines precise clamping onset threshold for overvoltage detection |
| VWM | 33.3 V - maximum continuous DC or RMS voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 53.9 V at 27.8 A - clamped voltage during 10/1000 µs surge, limiting downstream device stress |
| PPPM | 1500 W - peak transient power handling capability per single 10/1000 µs pulse |
| TJ range | –55 °C to +175 °C - wide operating junction temperature supports under-hood and industrial environments |
| RθJA | 75 °C/W - thermal resistance determines self-heating rise above ambient at given power dissipation |
| IFSM | 200 A - non-repetitive forward surge current rating (8.3 ms half-sine), critical for input rectifier protection |
Pinout & Package
Package: Case Style 1.5KE - axial-leaded DO-201AD molded epoxy package with matte tin-plated leads, UL 94 V-0 rated, RoHS compliant (E3 suffix), 0.968 g unit weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; defines conduction direction during reverse-biased transient |
| Cathode | High-side transient clamp node | Marked with color band; connected to protected line (e.g., +24 V rail); conducts when VAK > VBR |
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) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) in properly filtered circuits |
| Clamping ratio (VC/VBR) | 1.45 - low ratio ensures minimal overvoltage overshoot during fast transients |
| Response time | <1 ns - faster than MOVs or GDTs, preserving timing-critical signal integrity |
| AEC-Q101 qualification option | Available as 1.5KE39AHE3_B variant for automotive-grade reliability validation |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V DC input stage of programmable logic controllers against load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +24 V rail and chassis ground to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤53.9 V during 27.8 A surges, preventing latch-up or gate oxide damage in downstream SiC MOSFET drivers. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs in door module ECUs exposed to battery disconnection spikes. IC Role / Device Role / Timing Role: Cathode-connected to LIN line, anode to ground; suppresses ±100 V/10/1000 µs transients induced by alternator regulation faults. Use Value: Maintains signal integrity below 54 V clamping level while adding <0.5 pF parasitic capacitance, avoiding LIN timing skew. |
| Telecom Remote Power Feeding | Consumer Appliance Motor Drive |
Use Scenario: Overvoltage protection on 48 V PoE-powered remote radio units subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-stage TVS on DC input before isolation transformer; coordinated with secondary-side TVS for cascaded protection. Use Value: Absorbs 1500 W transient energy without degradation, meeting Telcordia GR-1089-CORE Level 3 surge requirements. | Use Scenario: Input rail protection in smart washing machine motor inverters where brushed motor commutation generates repetitive 100 V spikes. IC Role / Device Role / Timing Role: Mounted across bulk capacitor terminals to limit voltage rise during high-dI/dt events. Use Value: Withstands 200 A non-repetitive forward surge (8.3 ms), surviving repeated motor startup transients without parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A | Lower PPPM (600 W), smaller SMB package (vs. DO-201AD), VBR = 40–44.2 V, VC = 58.1 V @ 10.3 A | Surface-mount only; unsuitable for through-hole legacy designs or high-energy 1500 W surges | Select when board space is constrained and surge energy is ≤600 W; verify PCB thermal relief for 6.5 W dissipation. |
| 1.5KE36A | Lower VBR (34.2–37.8 V), VWM = 30.8 V, VC = 49.9 V @ 30.1 A - tighter clamping but lower standoff margin | Better for 24 V nominal systems with strict 30 V max operating voltage; less margin against sustained overvoltage | Choose when protecting 24 V logic rails where 33.3 V VWM of 1.5KE39A risks leakage; confirm system VMAX allows 30.8 V standoff. |
Compared with SMBJ36A, the 1.5KE39A delivers 2.5× higher surge power handling and axial-leaded robustness for high-reliability through-hole mounting; versus 1.5KE36A, it trades 3.5 V higher VWM for improved noise immunity and reduced false triggering in noisy 24 V industrial environments.
Availability
1.5KE39A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom remote powering, and consumer appliance motor drives requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE39A 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, efficiency, and application-specific optimization.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments-targeting industrial automation, automotive subsystems, and infrastructure equipment where failure due to voltage surges must be eliminated.
FAQ
What is the breakdown voltage tolerance for 1.5KE39A?
The 1.5KE39A has a guaranteed breakdown voltage range of 37.1 V to 41.0 V at 1.0 mA test current, corresponding to a ±5 % tolerance around the nominal 39 V rating. This tight VBR spread ensures consistent clamping behavior across production lots and simplifies design margining for 24 V and 36 V systems. The 1.5KE39A datasheet specifies these limits under JEDEC test conditions and confirms compliance via lot-level screening.
Can 1.5KE39A be used in bidirectional configurations?
No, the 1.5KE39A is strictly unidirectional. Bidirectional variants use the "CA" suffix (e.g., 1.5KE39CA), which is a separate part number with symmetrical clamping in both polarities. Using the 1.5KE39A in reverse-biased AC applications would result in forward conduction and potential failure. For bidirectional protection at ~39 V, specify 1.5KE39CA, which has matched VBR in both directions and no polarity marking.
What is the maximum clamping voltage of 1.5KE39A under surge conditions?
The 1.5KE39A clamps to a maximum of 53.9 V when subjected to its rated peak pulse current of 27.8 A using the standard 10/1000 µs waveform. This value is measured per JEDEC Standard 28 and represents worst-case voltage seen by downstream circuitry during transient events. Designers must ensure that all protected components have a minimum absolute maximum rating exceeding 53.9 V to avoid damage.
How does thermal derating affect 1.5KE39A's power handling above 25 °C?
1.5KE39A's 6.5 W continuous power dissipation (PD) is rated at TL = 75 °C with infinite heatsink conditions. Above 25 °C ambient, its peak pulse power must be linearly derated per Figure 2 in the Vishay datasheet: at 100 °C case temperature, PPPM drops to ~750 W. The 1.5KE39A thermal resistance (RθJA = 75 °C/W) dictates that sustained operation above 6.5 W requires external heatsinking or airflow to maintain TJ ≤ 175 °C.
Is 1.5KE39A suitable for automotive applications?
The base 1.5KE39A is commercial-grade; however, the AEC-Q101 qualified version 1.5KE39AHE3_B is available for automotive use. This variant undergoes stress testing per AEC-Q101 Rev D, including HTOL, temperature cycling, and HTRB, and is marked with HE3 and revision code (e.g., B). For body control modules or infotainment power rails, specify the HE3 variant-not the standard 1.5KE39A-to meet automotive reliability requirements.
1.5KE39A/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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 27.8A
- 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
1.5KE39A/54 FAQ
1.How can I place an order for 1.5KE39A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE39A/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 1.5KE39A/54 reliable?
The price and inventory of 1.5KE39A/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE39A/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE39A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE39A/54 transactions.
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4.How is shipping managed for 1.5KE39A/54?
1.5KE39A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE39A/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 1.5KE39A/54?
For technical support, including 1.5KE39A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE39A/54 requirements.
6.How does Aetrix verify that 1.5KE39A/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE39A/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 1.5KE39A/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE39A/54?
All 1.5KE39A/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE39A/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 1.5KE39A/54 part is unused and in its original packaging.
Return procedure for 1.5KE39A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE39A/54 Tags
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