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Vishay General Semiconductor - Diodes Division 1.5KE39A-E3/54
- Part No.:
- 1.5KE39A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE39A-E3/54.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:4,954
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Product details
Overview
1.5KE39A-E3/54 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 39 V nominal breakdown voltage (VBR = 37.1–41.0 V at 1.0 mA), 1500 W peak pulse power rating (10/1000 µs), clamping voltage of 53.9 V at 27.8 A, and operates across –55 °C to +175 °C junction temperature. It is widely used in automotive power supply inputs and industrial sensor interface protection.
For engineers reviewing the 1.5KE39A-E3/54 datasheet, 1.5KE39A-E3/54 pinout, 1.5KE39A-E3/54 application, or 1.5KE39A-E3/54 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant packaging details, and direct alternatives with documented functional trade-offs.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its clamping action begins at VBR ≥ 37.1 V and limits transient energy to ≤53.9 V at 27.8 A, enabling robust protection of downstream MOSFETs and ICs against inductive switching spikes and lightning-induced surges.
The device complies with JEDEC standards for surge testing (8.3 ms half-sine, 10/1000 µs waveform) and supports repetitive operation at ≤0.01% duty cycle. Thermal resistance is specified as RθJA = 75 °C/W and RθJL = 15.4 °C/W, confirming suitability for lead-mounted PCB layouts without heatsinking under moderate ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines precise voltage threshold where clamping initiates; critical for matching system overvoltage tolerance. |
| VWM | 33.3 V - maximum continuous reverse working voltage; ensures no leakage conduction during normal 33 V rail operation. |
| IPPM | 27.8 A (10/1000 µs) - peak surge current capability; determines survivability against IEC 61000-4-5 Level 4 transients. |
| VC | 53.9 V at IPPM - clamped voltage seen by protected circuit; must remain below absolute maximum ratings of downstream devices. |
| PPPM | 1500 W - peak pulse power handling; enables single-device protection for high-energy transients in 12 V/24 V automotive systems. |
| TJ max | +175 °C - maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| RθJL | 15.4 °C/W - junction-to-lead thermal resistance; confirms effective heat transfer through leads to PCB copper, enabling reliable pulsed operation. |
Pinout & Package
Package: Case Style 1.5KE - molded epoxy body with matte tin-plated leads, UL 94 V-0 rated, RoHS compliant (E3 suffix), 0.968 g unit weight, supplied in 13" paper tape and reel (54 per reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or lower-potential node; completes clamping loop during positive transients on cathode side. |
| Cathode | Protected line connection / transient input | Connected to line being protected (e.g., 33 V rail); color band denotes cathode end per polarity marking convention. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| 1500 W peak pulse power (10/1000 µs) | Supports protection against severe transients including ISO 7637-2 Pulse 5a (load dump) in automotive 24 V systems. |
| Clamping voltage ≤53.9 V at 27.8 A | Ensures protected ICs with 60 V absolute maximum rating (e.g., CAN transceivers, microcontrollers) remain within safe operating area. |
| Response time <1 ns | Prevents voltage overshoot before protection activates-critical for safeguarding fast-switching MOSFET gates and precision analog front-ends. |
| AEC-Q101 qualification available (HE3 variant) | Confirms stress-test validation for automotive applications; E3 variant is commercial-grade but shares identical electrical specs. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary shunt clamp placed between power rail and chassis ground; conducts only during overvoltage events. Use Value: Limits rail voltage to ≤53.9 V during 1500 W surges, preventing damage to 60 V-rated DC-DC converters and MCU power supplies. |
Use Scenario: Shielding 4–20 mA current-loop sensor outputs from ESD and field-induced surges in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed across signal and return lines; absorbs ±15 kV HBM ESD and 1 kV ring wave transients. Use Value: Maintains signal integrity by clamping transients before they reach op-amp input stages, avoiding latch-up or offset drift. |
| Telecom DC Power Feeds | Consumer Equipment AC/DC Adapter Outputs |
Use Scenario: Safeguarding PoE-powered switches and base station RF modules from lightning-induced surges on -48 V DC distribution lines. IC Role / Device Role / Timing Role: Unidirectional TVS connected cathode-to-rail, anode-to-ground; activated only during negative-going transients on negative supply. Use Value: Withstands 27.8 A surge current while holding clamped voltage below -55 V, preserving isolation barriers and DC-DC controller ICs. |
Use Scenario: Preventing failure of USB-C PD adapters and smart home hubs due to mains-coupled transients entering via secondary-side 5–20 V outputs. IC Role / Device Role / Timing Role: Final-stage TVS on regulated output rail; acts as last line of defense after primary MOV and secondary filter capacitors. Use Value: Delivers 1500 W pulse handling without degradation, ensuring compliance with IEC 62368-1 surge immunity requirements for Class II equipment. |
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 (RθJA = 110 °C/W), VBR = 40–44.2 V, VC = 58.1 V at 10.3 A | Better suited for space-constrained consumer electronics; insufficient for automotive load dump without parallel staging. | Select when board area is limited and surge energy is ≤600 W; verify thermal margin with layout-specific RθJA. |
| 1.5KE39CA | Bidirectional variant; identical VBR, VC, and PPPM; symmetrical clamping for AC-coupled or floating lines. | Required for protecting differential pairs (e.g., RS-485, CAN bus) or transformer-coupled interfaces where polarity reversal occurs. | Choose 1.5KE39CA only if bidirectional clamping is needed; unidirectional 1.5KE39A-E3/54 offers lower cost and simpler grounding for DC rails. |
Compared with SMBJ36A, 1.5KE39A-E3/54 delivers 2.5× higher surge power handling and superior thermal dissipation via axial leads, making it preferred for industrial and automotive DC bus protection; versus 1.5KE39CA, it provides lower-cost unidirectional clamping where ground-referenced protection suffices.
Availability
1.5KE39A-E3/54 is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface hardening, telecom DC feed protection, and consumer adapter output safeguarding requiring stable component supply across multi-year production cycles.
Supply support for 1.5KE39A-E3/54 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, ruggedness, and automotive-grade qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and thermal stability are non-negotiable.
FAQ
What is the breakdown voltage tolerance of the 1.5KE39A-E3/54?
The 1.5KE39A-E3/54 has a guaranteed breakdown voltage range of 37.1 V to 41.0 V at 1.0 mA test current, per Vishay Document 88301. This ±5.3% tolerance ensures consistent clamping initiation across production lots and temperature extremes, supporting robust design margins for 33 V systems where overvoltage headroom is tightly constrained.
Does the 1.5KE39A-E3/54 meet automotive qualification standards?
The 1.5KE39A-E3/54 is the commercial-grade variant (E3 suffix) and is not AEC-Q101 qualified. However, its identical electrical specifications and construction are shared with the AEC-Q101-qualified 1.5KE39AHE3_B variant. For automotive designs requiring formal qualification, engineers should specify the HE3 version while retaining full compatibility with 1.5KE39A-E3/54 in layout and schematic.
How does the clamping voltage of the 1.5KE39A-E3/54 compare to its breakdown voltage?
The 1.5KE39A-E3/54 clamps at 53.9 V when subjected to its rated 27.8 A peak pulse current (10/1000 µs), which is approximately 38% above its minimum breakdown voltage of 37.1 V. This incremental clamping voltage (ΔVC = 16.8 V) reflects the device's low dynamic impedance and confirms effective energy diversion without excessive voltage overshoot into protected circuits.
Can the 1.5KE39A-E3/54 be used in parallel for higher surge current handling?
Yes, multiple 1.5KE39A-E3/54 devices can be paralleled to increase total surge current capacity, provided matched VBR units are selected and PCB layout ensures equal current sharing (e.g., symmetric trace lengths, common ground plane). Derating is required: two units yield <55 A total IPPM (not 55.6 A) due to minor VBR variation affecting current division.
What is the thermal resistance profile of the 1.5KE39A-E3/54, and how does it affect PCB layout?
The 1.5KE39A-E3/54 has RθJL = 15.4 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient). This indicates efficient heat transfer through its axial leads-so PCB layout should maximize copper area connected to both leads (≥25 mm² per pad) and avoid narrow traces. No heatsink is required for single-pulse events, but repetitive surges demand careful thermal management via internal copper planes.
1.5KE39A-E3/54 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:
- Active
- 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-E3/54 FAQ
1.How can I place an order for 1.5KE39A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE39A-E3/54 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-E3/54 reliable?
The price and inventory of 1.5KE39A-E3/54 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-E3/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE39A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE39A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE39A-E3/54?
1.5KE39A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE39A-E3/54 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-E3/54?
For technical support, including 1.5KE39A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE39A-E3/54 requirements.
6.How does Aetrix verify that 1.5KE39A-E3/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE39A-E3/54 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-E3/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE39A-E3/54?
All 1.5KE39A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE39A-E3/54, 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-E3/54 part is unused and in its original packaging.
Return procedure for 1.5KE39A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE39A-E3/54 Tags
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