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Vishay General Semiconductor - Diodes Division 1.5KE56AHE3/51
- Part No.:
- 1.5KE56AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE56AHE3/51.pdf
- Description:
- TVS DIODE 47.8VWM 77VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,586
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Product details
Overview
1.5KE56AHE3/51 from Vishay General Semiconductor is a uni-directional transient voltage suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 53.2 V minimum breakdown voltage (VBR), 47.8 V maximum stand-off voltage (VWM), 77.0 V clamping voltage (VC) at 19.5 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1.5KE56AHE3/51 datasheet, 1.5KE56AHE3/51 pinout, 1.5KE56AHE3/51 application, or 1.5KE56AHE3/51 equivalent, this device is selected for robust ESD and surge immunity in automotive power supplies, industrial sensor interfaces, and telecom line protection where fast clamping (<1 ns), low leakage (<1 µA at VWM), and stable thermal performance up to 175 °C junction temperature are required.
Technical Context
The 1.5KE56AHE3/51 operates as a uni-directional avalanche diode with glass-passivated junction, delivering precise voltage clamping during transients induced by inductive switching or lightning surges. Its 10/1000 µs waveform response enables reliable suppression of high-energy events while maintaining low incremental surge resistance and excellent clamping ratio (VC/VBR ≈ 1.45).
Designed for surface-mount-compatible through-hole installation in Case Style 1.5KE, it supports soldering per J-STD-002 and JESD 22-B102, with matte tin-plated leads and JESD 201 Class 2 whisker resistance. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification per note (2) in the datasheet for 1.5KE6.8AHE3_A to 1.5KE220AHE3_A variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 53.2 V - Ensures reliable conduction onset above normal operating voltage, preventing false triggering on ripple or noise. |
| VWM | 47.8 V - Maximum continuous reverse working voltage; defines safe DC operating margin before leakage rises sharply. |
| VC @ IPPM | 77.0 V - Clamped voltage at 19.5 A peak pulse; determines maximum stress imposed on protected downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capability under standardized 10/1000 µs waveform; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IPPM | 19.5 A - Peak pulse current capacity; sets absolute limit for single-event surge energy absorption without degradation. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Leakage @ VWM | <1.0 µA - Ultra-low reverse leakage ensures minimal power loss and no interference with high-impedance sensing circuits. |
Pinout & Package
Package: Case Style 1.5KE - molded epoxy body with axial leads, UL 94 V-0 rated, 0.375" (9.5 mm) lead length, 0.042" (1.07 mm) lead diameter. Dimensions comply with JEDEC TO-201AA outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during forward surge or bias conditions. |
| Cathode | Avalanche clamping terminal | Marked with color band; connected to protected line (e.g., +12 V rail); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5 %) and long-term reliability under thermal cycling and humidity exposure. |
| 1500 W peak pulse power (10/1000 µs) | Validates suitability for IEC 61000-4-5 surge immunity testing at 2 Ω source impedance and 1 kV–4 kV levels. |
| AEC-Q101 qualified | Confirms qualification for automotive powertrain and body electronics applications per stress test requirements including HTOL, TCT, and HAST. |
| Low clamping ratio (VC/VBR = 1.45) | Minimizes voltage overshoot across protected components, reducing risk of latch-up or gate oxide damage in MOSFETs and ICs. |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under high-temperature/humidity storage, critical for long-life automotive and industrial deployments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a, up to 120 V/100 ms). IC Role / Device Role: Primary clamping element placed between battery input and upstream DC/DC converter input stage. Use Value: Limits voltage seen by regulator IC to ≤77.0 V during 19.5 A surge, preventing overvoltage shutdown or destruction. |
Use Scenario: Shielding 4–20 mA current loop transmitters from ESD (IEC 61000-4-2 ±8 kV contact) and field wiring surges. IC Role / Device Role: Uni-directional TVS mounted across loop supply terminals, referenced to local ground. Use Value: Clamps transients within 1 ns while adding <1 µA leakage, preserving loop accuracy and enabling fail-safe diagnostics. |
| Telecom Line Surge Suppression | Consumer Power Adapter Input Protection |
|
Use Scenario: Safeguarding PoE-powered Ethernet ports (IEEE 802.3af/at) against lightning-induced surges on data pairs. IC Role / Device Role: Paired with bi-directional TVS for common-mode suppression; 1.5KE56AHE3/51 used on DC bias rail. Use Value: Absorbs 1500 W surge energy without degradation, maintaining isolation integrity and preventing PHY IC latch-up. |
Use Scenario: Guarding AC-DC adapter primary-side rectifier output against mains-borne surges (IEC 61000-4-5 Level 3). IC Role / Device Role: Secondary-side clamping device across bulk capacitor, downstream of isolation barrier. Use Value: Prevents overvoltage failure of post-regulator ICs by clamping to 77.0 V with <1 µA standby leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A | Lower PPPM (600 W), smaller SMB package (vs. axial 1.5KE), 58 V VBR min, 47.8 V VWM, 93.6 V VC @ 6.4 A. | Not AEC-Q101 qualified; suited for space-constrained consumer PCBs but lacks automotive validation. | Select when board area is critical and automotive qualification is not required; verify clamping headroom vs. protected IC VDS(max). |
| 1.5KE56A-E3/54 | Same electrical specs and 1.5KE package, but commercial-grade (non-AEC-Q101) and packaged in 1400-piece tape-and-reel (54 code vs. 51). | Approved for industrial/commercial use only; not validated for automotive temperature cycling or lifetime reliability stress tests. | Choose for cost-sensitive non-automotive designs where AEC-Q101 is unnecessary; identical pinout and layout compatibility. |
Compared with 1.5KE56AHE3/51, SMBJ58A offers smaller footprint but reduced surge capacity and no automotive qualification, while 1.5KE56A-E3/54 matches form/fit/function but omits AEC-Q101 validation-making 1.5KE56AHE3/51 the sole option when both 1500 W clamping and automotive-grade reliability are mandatory.
Availability
1.5KE56AHE3/51 is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial sensor interface hardening, and telecom line surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5KE56AHE3/51 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, precision, 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 sustained surge immunity and AEC-Q101 compliance are essential design requirements.
FAQ
What is the breakdown voltage tolerance for 1.5KE56AHE3/51?
The 1.5KE56AHE3/51 has a specified breakdown voltage range of 53.2 V (min) to 58.8 V (max) at 1.0 mA test current, corresponding to a ±5 % tolerance around the nominal 56 V rating. This tight tolerance ensures predictable clamping onset across production lots and temperature ranges from –55 °C to +175 °C.
Is 1.5KE56AHE3/51 suitable for bi-directional surge protection?
No, 1.5KE56AHE3/51 is a uni-directional TVS diode, indicated by the "A" suffix and cathode band marking. For bi-directional applications, Vishay specifies part numbers ending in "CA" (e.g., 1.5KE56CAHE3/51). Using 1.5KE56AHE3/51 in AC or floating-line scenarios risks forward conduction and failure during negative half-cycles.
What is the maximum clamping voltage of 1.5KE56AHE3/51 under surge conditions?
The maximum clamping voltage (VC) of 1.5KE56AHE3/51 is 77.0 V at 19.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is guaranteed per datasheet Table on page 2 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Does 1.5KE56AHE3/51 meet automotive qualification standards?
Yes, 1.5KE56AHE3/51 carries the HE3 suffix, which-per datasheet Note (2) on page 3-confirms AEC-Q101 qualification for the 1.5KE6.8AHE3_A to 1.5KE220AHE3_A family. This includes stress testing for high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing.
What is the thermal resistance of 1.5KE56AHE3/51 from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for 1.5KE56AHE3/51 is 75 °C/W, as specified in the Thermal Characteristics table on page 3 of the datasheet. This value assumes standard PCB mounting with 0.375" (9.5 mm) lead length and is critical for calculating steady-state junction temperature rise under continuous power dissipation.
1.5KE56AHE3/51 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):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 19.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE56AHE3/51 FAQ
1.How can I place an order for 1.5KE56AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE56AHE3/51 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 1.5KE56AHE3/51 reliable?
The price and inventory of 1.5KE56AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE56AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE56AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE56AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE56AHE3/51?
1.5KE56AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE56AHE3/51 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 1.5KE56AHE3/51?
For technical support, including 1.5KE56AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE56AHE3/51 requirements.
6.How does Aetrix verify that 1.5KE56AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE56AHE3/51 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 1.5KE56AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE56AHE3/51?
All 1.5KE56AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE56AHE3/51, 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 1.5KE56AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE56AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE56AHE3/51 Tags
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