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Vishay General Semiconductor - Diodes Division 1.5KA39HE3/51
- Part No.:
- 1.5KA39HE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA39HE3/51.pdf
- Description:
- TVS DIODE 31.6VWM 56.4VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:8,376
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Product details
Overview
1.5KA39HE3/51 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge clamping in power and signal lines. It delivers 1500 W peak pulse power (10/1000 µs), 56.4 V maximum clamping voltage at 26.6 A IPPM, and operates up to +185 °C junction temperature - deployed in engine control units, ABS modules, and automotive sensor interfaces.
For engineers reviewing the 1.5KA39HE3/51 datasheet, 1.5KA39HE3/51 pinout, 1.5KA39HE3/51 application, or 1.5KA39HE3/51 equivalent, key selection criteria include clamping voltage vs. breakdown tolerance, AEC Q101 qualification status, 10/1000 µs waveform compliance, and thermal derating above 25 °C ambient.
Technical Context
This TVS diode uses patented PAR® construction with passivated junction and molded epoxy body (UL 94 V-0). Its unidirectional polarity enables robust reverse-biased transient suppression without forward conduction during normal operation.
It features low incremental surge resistance and fast response time (<1 ns), enabling effective protection against inductive switching transients and ESD events. The device is rated for 200 A non-repetitive forward surge (8.3 ms half-sine) and meets JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains single high-energy surges common in automotive load-dump and ISO 7637-2 test pulses |
| Breakdown Voltage VBR | 35.1–42.9 V - ensures reliable triggering above system operating voltage while avoiding false clamping |
| Clamping Voltage VC | 56.4 V at 26.6 A - defines maximum voltage seen by protected ICs during worst-case transient |
| Stand-off Voltage VWM | 31.6 V - allows safe operation under nominal 24 V automotive rail with margin |
| Junction Temperature Range | −65 °C to +185 °C - supports under-hood deployment in modern engine compartments |
| AEC-Q101 Qualified | Yes - validated for automotive reliability including temperature cycling, HTRB, and mechanical shock |
| RoHS & WEEE Compliant | Yes - HE3 suffix denotes lead-free, high-reliability, automotive-grade construction |
Pinout & Package
Package: Case Style 1.5KA - axial-leaded, molded epoxy body (0.375" lead length, 0.210" diameter), UL 94 V-0 rated, matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / cathode-referenced reference | Connected to ground or low-impedance return path in unidirectional clamp configuration |
| Cathode | Transient current sink / clamping node | Connected to protected line; color band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables uniform voltage distribution across junction area, improving surge lifetime and consistency vs. standard planar TVS |
| 1500 W peak pulse rating | Meets ISO 7637-2 Pulse 5a (load dump) requirements for 12 V and 24 V systems without external series impedance |
| AEC-Q101 qualification | Validated for automotive use including HTGB, TCT, and HAST - eliminates need for additional qualification testing |
| Low clamping ratio (VC/VBR ≈ 1.58) | Minimizes overvoltage stress on downstream MOSFETs, CAN transceivers, and microcontrollers during transients |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, critical for long-life automotive electronics |
Applications
| Engine Control Unit (ECU) Power Input Protection | ABS Module Sensor Line Clamping |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 60 V, 400 ms) induced by alternator disconnection in 24 V commercial vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp overvoltage before it reaches DC/DC converters and MCU power supplies. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V regulators and automotive-grade MCUs operating at TJ ≤ 185 °C. |
Use Scenario: Protects analog front-end circuitry of wheel-speed sensors from inductive kickback generated by solenoid actuation in anti-lock braking systems. IC Role / Device Role / Timing Role: Fast-response TVS placed at connector interface to shunt transients <1 ns after onset, preserving signal integrity on 1–2 mA sensor current loops. Use Value: Maintains functional safety (ASIL-B) by ensuring sensor output remains within ADC input range during 10/1000 µs surges up to 1500 W. |
| Body Control Module (BCM) LIN Bus Protection | Automotive Camera Module Power Rail |
Use Scenario: Shields LIN transceiver I/O pins from ESD and cable discharge events in door module wiring harnesses exposed to human contact. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS connected between LIN data line and ground, with VWM = 31.6 V to avoid interfering with 12 V bias networks. Use Value: Enables >15 kV contact ESD immunity per ISO 10605 while maintaining LIN signal rise/fall times below 200 ns. |
Use Scenario: Guards 5 V or 12 V power input of rear-view camera modules mounted in hot trunk environments (>105 °C ambient). IC Role / Device Role / Timing Role: High-temperature TVS installed upstream of LDO regulator to absorb ISO 7637-2 Pulse 1 (inductive switch-off) transients. Use Value: Ensures continuous video output by preventing brownout or reset of image sensor ASICs during repeated 100 V/50 ms transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36AHE3/52 | Lower PPPM (600 W), lower VBR (36.0–39.8 V), same AEC-Q101, smaller SMB package | Better suited for space-constrained PCBs with lower energy threat profiles (e.g., infotainment USB ports) | Select when board area is limited and peak surge energy does not exceed 600 W |
| 1.5KE39A-E3/54 | Same VBR/VC specs, but non-automotive grade (no AEC-Q101), higher leakage at 150 °C, TO-204AA package | Acceptable for industrial controls where automotive qualification is not mandated | Choose only for cost-sensitive non-automotive designs requiring identical electrical performance |
Compared with 1.5KA39HE3/51, SMBJ36AHE3/52 offers footprint reduction at the expense of 60 % lower surge handling, while 1.5KE39A-E3/54 matches clamping performance but lacks AEC-Q101 validation and high-temperature reliability assurance required for under-hood deployment.
Availability
1.5KA39HE3/51 is available at Aetrix Electronics and suitable for automotive power management, sensor interface protection, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1.5KA39HE3/51 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 high-reliability diodes, MOSFETs, and passive components for demanding industrial and automotive applications.
The 1.5KA family was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing thermal stability, surge endurance, and long-term parametric consistency under temperature cycling.
FAQ
What is the clamping voltage of the 1.5KA39HE3/51 at its rated peak pulse current?
The 1.5KA39HE3/51 has a maximum clamping voltage (VC) of 56.4 V at 26.6 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The 1.5KA39HE3/51 maintains this clamping performance across its full operating temperature range.
Is the 1.5KA39HE3/51 qualified to AEC-Q101 standards?
Yes, the 1.5KA39HE3/51 is explicitly qualified to AEC-Q101 Rev D for automotive discrete semiconductors. Its qualification includes stress tests such as high-temperature reverse bias (HTRB), temperature cycling (TCT), and highly accelerated stress testing (HAST), confirming reliability for under-hood and chassis-mounted applications. The HE3 suffix denotes this automotive-grade compliance.
What is the stand-off voltage (VWM) and why is it important for the 1.5KA39HE3/51?
The 1.5KA39HE3/51 has a maximum stand-off voltage (VWM) of 31.6 V, meaning it remains non-conductive up to this DC or RMS voltage level. This parameter ensures no leakage current flows during normal 24 V automotive system operation, preventing power loss and false triggering. Exceeding VWM risks premature conduction and thermal runaway, so proper margin between VWM and system rail is essential.
Can the 1.5KA39HE3/51 be used in bidirectional configurations?
No, the 1.5KA39HE3/51 is specified for uni-directional polarity only, as confirmed in the Vishay datasheet Document Number 88300. Its internal structure and test methodology assume cathode-to-anode orientation for transient suppression. For bidirectional protection, a separate device such as the 1.5KE39CA or SMAJ39CA must be selected - the 1.5KA39HE3/51 is not rated or characterized for reverse surge capability.
What is the junction temperature rating of the 1.5KA39HE3/51 and how does it affect layout?
The 1.5KA39HE3/51 supports an operating junction temperature range of −65 °C to +185 °C, enabling direct placement near heat sources like power relays or motor drivers. Layout must ensure adequate copper pour and thermal relief on both leads to sustain 185 °C junction temperature under full 1500 W pulse loading; insufficient heatsinking will cause thermal derating per Figure 2 in the datasheet.
1.5KA39HE3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 31.6V
- Voltage - Breakdown (Min):
- 35.1V
- Voltage - Clamping (Max) @ Ipp:
- 56.4V
- Current - Peak Pulse (10/1000µs):
- 26.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KA
1.5KA39HE3/51 FAQ
1.How can I place an order for 1.5KA39HE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA39HE3/51 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 1.5KA39HE3/51 reliable?
The price and inventory of 1.5KA39HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA39HE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA39HE3/51?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA39HE3/51?
1.5KA39HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA39HE3/51 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 1.5KA39HE3/51?
For technical support, including 1.5KA39HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA39HE3/51 requirements.
6.How does Aetrix verify that 1.5KA39HE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA39HE3/51 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 1.5KA39HE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA39HE3/51?
All 1.5KA39HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA39HE3/51, 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 1.5KA39HE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA39HE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA39HE3/51 Tags
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